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 ieee80211_chanctx_conf *chanctx_conf;
 182         struct ieee80211_channel *chan;
 183         struct sta_info *sta;
 184         u32 changed = 0;
 185         u16 ht_opmode;
 186         bool disable_40 = false;
 187
 188         rcu_read_lock();
 189         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 190         if (WARN_ON(!chanctx_conf)) {
 191                 rcu_read_unlock();
 192                 return 0;
 193         }
 194         chan = chanctx_conf->channel;
 195         rcu_read_unlock();
 196         sband = local->hw.wiphy->bands[chan->band];
 197
 198         switch (sdata->vif.bss_conf.channel_type) {
 199         case NL80211_CHAN_HT40PLUS:
 200                 if (chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
 201                         disable_40 = true;
 202                 break;
 203         case NL80211_CHAN_HT40MINUS:
 204                 if (chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
 205                         disable_40 = true;
 206                 break;
 207         default:
 208                 break;
 209         }
 210
 211         /* This can change during the lifetime of the BSS */
 212         if (!(ht_oper->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
 213                 disable_40 = true;
 214
 215         mutex_lock(&local->sta_mtx);
 216         sta = sta_info_get(sdata, bssid);
 217
 218         WARN_ON_ONCE(!sta);
 219
 220         if (sta && !sta->supports_40mhz)
 221                 disable_40 = true;
 222
 223         if (sta && (!reconfig ||
 224                     (disable_40 != !(sta->sta.ht_cap.cap &
 225                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40)))) {
 226
 227                 if (disable_40)
 228                         sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 229                 else
 230                         sta->sta.ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 231
 232                 rate_control_rate_update(local, sband, sta,
 233                                          IEEE80211_RC_BW_CHANGED);
 234         }
 235         mutex_unlock(&local->sta_mtx);
 236
 237         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 238
 239         /* if bss configuration changed store the new one */
 240         if (!reconfig || (sdata->vif.bss_conf.ht_operation_mode != ht_opmode)) {
 241                 changed |= BSS_CHANGED_HT;
 242                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 243         }
 244
 245         return changed;
 246 }
 247
 248 /* frame sending functions */
 249
 250 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 251                                       struct ieee80211_supported_band *sband,
 252                                       u32 *rates)
 253 {
 254         int i, j, count;
 255         *rates = 0;
 256         count = 0;
 257         for (i = 0; i < supp_rates_len; i++) {
 258                 int rate = (supp_rates[i] & 0x7F) * 5;
 259
 260                 for (j = 0; j < sband->n_bitrates; j++)
 261                         if (sband->bitrates[j].bitrate == rate) {
 262                                 *rates |= BIT(j);
 263                                 count++;
 264                                 break;
 265                         }
 266         }
 267
 268         return count;
 269 }
 270
 271 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 272                                 struct sk_buff *skb, u8 ap_ht_param,
 273                                 struct ieee80211_supported_band *sband,
 274                                 struct ieee80211_channel *channel,
 275                                 enum ieee80211_smps_mode smps)
 276 {
 277         u8 *pos;
 278         u32 flags = channel->flags;
 279         u16 cap;
 280         struct ieee80211_sta_ht_cap ht_cap;
 281
 282         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 283
 284         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 285         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 286
 287         /* determine capability flags */
 288         cap = ht_cap.cap;
 289
 290         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 291         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 292                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 293                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 294                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 295                 }
 296                 break;
 297         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 298                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 299                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 300                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 301                 }
 302                 break;
 303         }
 304
 305         /*
 306          * If 40 MHz was disabled associate as though we weren't
 307          * capable of 40 MHz -- some broken APs will never fall
 308          * back to trying to transmit in 20 MHz.
 309          */
 310         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 311                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 312                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 313         }
 314
 315         /* set SM PS mode properly */
 316         cap &= ~IEEE80211_HT_CAP_SM_PS;
 317         switch (smps) {
 318         case IEEE80211_SMPS_AUTOMATIC:
 319         case IEEE80211_SMPS_NUM_MODES:
 320                 WARN_ON(1);
 321         case IEEE80211_SMPS_OFF:
 322                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 323                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 324                 break;
 325         case IEEE80211_SMPS_STATIC:
 326                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 327                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 328                 break;
 329         case IEEE80211_SMPS_DYNAMIC:
 330                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 331                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 332                 break;
 333         }
 334
 335         /* reserve and fill IE */
 336         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 337         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 338 }
 339
 340 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 341                                  struct sk_buff *skb,
 342                                  struct ieee80211_supported_band *sband)
 343 {
 344         u8 *pos;
 345         u32 cap;
 346         struct ieee80211_sta_vht_cap vht_cap;
 347
 348         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 349
 350         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 351
 352         /* determine capability flags */
 353         cap = vht_cap.cap;
 354
 355         /* reserve and fill IE */
 356         pos = skb_put(skb, sizeof(struct ieee80211_vht_capabilities) + 2);
 357         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 358 }
 359
 360 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 361 {
 362         struct ieee80211_local *local = sdata->local;
 363         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 364         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 365         struct sk_buff *skb;
 366         struct ieee80211_mgmt *mgmt;
 367         u8 *pos, qos_info;
 368         size_t offset = 0, noffset;
 369         int i, count, rates_len, supp_rates_len;
 370         u16 capab;
 371         struct ieee80211_supported_band *sband;
 372         struct ieee80211_chanctx_conf *chanctx_conf;
 373         struct ieee80211_channel *chan;
 374         u32 rates = 0;
 375
 376         lockdep_assert_held(&ifmgd->mtx);
 377
 378         rcu_read_lock();
 379         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 380         if (WARN_ON(!chanctx_conf)) {
 381                 rcu_read_unlock();
 382                 return;
 383         }
 384         chan = chanctx_conf->channel;
 385         rcu_read_unlock();
 386         sband = local->hw.wiphy->bands[chan->band];
 387
 388         if (assoc_data->supp_rates_len) {
 389                 /*
 390                  * Get all rates supported by the device and the AP as
 391                  * some APs don't like getting a superset of their rates
 392                  * in the association request (e.g. D-Link DAP 1353 in
 393                  * b-only mode)...
 394                  */
 395                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 396                                                        assoc_data->supp_rates_len,
 397                                                        sband, &rates);
 398         } else {
 399                 /*
 400                  * In case AP not provide any supported rates information
 401                  * before association, we send information element(s) with
 402                  * all rates that we support.
 403                  */
 404                 rates = ~0;
 405                 rates_len = sband->n_bitrates;
 406         }
 407
 408         skb = alloc_skb(local->hw.extra_tx_headroom +
 409                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 410                         2 + assoc_data->ssid_len + /* SSID */
 411                         4 + rates_len + /* (extended) rates */
 412                         4 + /* power capability */
 413                         2 + 2 * sband->n_channels + /* supported channels */
 414                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 415                         2 + sizeof(struct ieee80211_vht_capabilities) + /* VHT */
 416                         assoc_data->ie_len + /* extra IEs */
 417                         9, /* WMM */
 418                         GFP_KERNEL);
 419         if (!skb)
 420                 return;
 421
 422         skb_reserve(skb, local->hw.extra_tx_headroom);
 423
 424         capab = WLAN_CAPABILITY_ESS;
 425
 426         if (sband->band == IEEE80211_BAND_2GHZ) {
 427                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 428                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 429                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 430                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 431         }
 432
 433         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 434                 capab |= WLAN_CAPABILITY_PRIVACY;
 435
 436         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 437             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 438                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 439
 440         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 441         memset(mgmt, 0, 24);
 442         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 443         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 444         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 445
 446         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 447                 skb_put(skb, 10);
 448                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 449                                                   IEEE80211_STYPE_REASSOC_REQ);
 450                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 451                 mgmt->u.reassoc_req.listen_interval =
 452                                 cpu_to_le16(local->hw.conf.listen_interval);
 453                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 454                        ETH_ALEN);
 455         } else {
 456                 skb_put(skb, 4);
 457                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 458                                                   IEEE80211_STYPE_ASSOC_REQ);
 459                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 460                 mgmt->u.assoc_req.listen_interval =
 461                                 cpu_to_le16(local->hw.conf.listen_interval);
 462         }
 463
 464         /* SSID */
 465         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 466         *pos++ = WLAN_EID_SSID;
 467         *pos++ = assoc_data->ssid_len;
 468         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 469
 470         /* add all rates which were marked to be used above */
 471         supp_rates_len = rates_len;
 472         if (supp_rates_len > 8)
 473                 supp_rates_len = 8;
 474
 475         pos = skb_put(skb, supp_rates_len + 2);
 476         *pos++ = WLAN_EID_SUPP_RATES;
 477         *pos++ = supp_rates_len;
 478
 479         count = 0;
 480         for (i = 0; i < sband->n_bitrates; i++) {
 481                 if (BIT(i) & rates) {
 482                         int rate = sband->bitrates[i].bitrate;
 483                         *pos++ = (u8) (rate / 5);
 484                         if (++count == 8)
 485                                 break;
 486                 }
 487         }
 488
 489         if (rates_len > count) {
 490                 pos = skb_put(skb, rates_len - count + 2);
 491                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 492                 *pos++ = rates_len - count;
 493
 494                 for (i++; i < sband->n_bitrates; i++) {
 495                         if (BIT(i) & rates) {
 496                                 int rate = sband->bitrates[i].bitrate;
 497                                 *pos++ = (u8) (rate / 5);
 498                         }
 499                 }
 500         }
 501
 502         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 503                 /* 1. power capabilities */
 504                 pos = skb_put(skb, 4);
 505                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 506                 *pos++ = 2;
 507                 *pos++ = 0; /* min tx power */
 508                 *pos++ = chan->max_power; /* max tx power */
 509
 510                 /* 2. supported channels */
 511                 /* TODO: get this in reg domain format */
 512                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 513                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 514                 *pos++ = 2 * sband->n_channels;
 515                 for (i = 0; i < sband->n_channels; i++) {
 516                         *pos++ = ieee80211_frequency_to_channel(
 517                                         sband->channels[i].center_freq);
 518                         *pos++ = 1; /* one channel in the subband*/
 519                 }
 520         }
 521
 522         /* if present, add any custom IEs that go before HT */
 523         if (assoc_data->ie_len && assoc_data->ie) {
 524                 static const u8 before_ht[] = {
 525                         WLAN_EID_SSID,
 526                         WLAN_EID_SUPP_RATES,
 527                         WLAN_EID_EXT_SUPP_RATES,
 528                         WLAN_EID_PWR_CAPABILITY,
 529                         WLAN_EID_SUPPORTED_CHANNELS,
 530                         WLAN_EID_RSN,
 531                         WLAN_EID_QOS_CAPA,
 532                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 533                         WLAN_EID_MOBILITY_DOMAIN,
 534                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 535                 };
 536                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 537                                              before_ht, ARRAY_SIZE(before_ht),
 538                                              offset);
 539                 pos = skb_put(skb, noffset - offset);
 540                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 541                 offset = noffset;
 542         }
 543
 544         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
 545                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 546                                     sband, chan, sdata->smps_mode);
 547
 548         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 549                 ieee80211_add_vht_ie(sdata, skb, sband);
 550
 551         /* if present, add any custom non-vendor IEs that go after HT */
 552         if (assoc_data->ie_len && assoc_data->ie) {
 553                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 554                                                     assoc_data->ie_len,
 555                                                     offset);
 556                 pos = skb_put(skb, noffset - offset);
 557                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 558                 offset = noffset;
 559         }
 560
 561         if (assoc_data->wmm) {
 562                 if (assoc_data->uapsd) {
 563                         qos_info = ifmgd->uapsd_queues;
 564                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 565                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 566                 } else {
 567                         qos_info = 0;
 568                 }
 569
 570                 pos = skb_put(skb, 9);
 571                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 572                 *pos++ = 7; /* len */
 573                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 574                 *pos++ = 0x50;
 575                 *pos++ = 0xf2;
 576                 *pos++ = 2; /* WME */
 577                 *pos++ = 0; /* WME info */
 578                 *pos++ = 1; /* WME ver */
 579                 *pos++ = qos_info;
 580         }
 581
 582         /* add any remaining custom (i.e. vendor specific here) IEs */
 583         if (assoc_data->ie_len && assoc_data->ie) {
 584                 noffset = assoc_data->ie_len;
 585                 pos = skb_put(skb, noffset - offset);
 586                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 587         }
 588
 589         drv_mgd_prepare_tx(local, sdata);
 590
 591         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 592         ieee80211_tx_skb(sdata, skb);
 593 }
 594
 595 void ieee80211_send_pspoll(struct ieee80211_local *local,
 596                            struct ieee80211_sub_if_data *sdata)
 597 {
 598         struct ieee80211_pspoll *pspoll;
 599         struct sk_buff *skb;
 600
 601         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 602         if (!skb)
 603                 return;
 604
 605         pspoll = (struct ieee80211_pspoll *) skb->data;
 606         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 607
 608         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 609         ieee80211_tx_skb(sdata, skb);
 610 }
 611
 612 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 613                              struct ieee80211_sub_if_data *sdata,
 614                              int powersave)
 615 {
 616         struct sk_buff *skb;
 617         struct ieee80211_hdr_3addr *nullfunc;
 618         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 619
 620         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 621         if (!skb)
 622                 return;
 623
 624         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 625         if (powersave)
 626                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 627
 628         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 629         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 630                             IEEE80211_STA_CONNECTION_POLL))
 631                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 632
 633         ieee80211_tx_skb(sdata, skb);
 634 }
 635
 636 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 637                                           struct ieee80211_sub_if_data *sdata)
 638 {
 639         struct sk_buff *skb;
 640         struct ieee80211_hdr *nullfunc;
 641         __le16 fc;
 642
 643         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 644                 return;
 645
 646         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 647         if (!skb)
 648                 return;
 649
 650         skb_reserve(skb, local->hw.extra_tx_headroom);
 651
 652         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 653         memset(nullfunc, 0, 30);
 654         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 655                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 656         nullfunc->frame_control = fc;
 657         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 658         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 659         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 660         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 661
 662         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 663         ieee80211_tx_skb(sdata, skb);
 664 }
 665
 666 /* spectrum management related things */
 667 static void ieee80211_chswitch_work(struct work_struct *work)
 668 {
 669         struct ieee80211_sub_if_data *sdata =
 670                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 671         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 672
 673         if (!ieee80211_sdata_running(sdata))
 674                 return;
 675
 676         mutex_lock(&ifmgd->mtx);
 677         if (!ifmgd->associated)
 678                 goto out;
 679
 680         sdata->local->_oper_channel = sdata->local->csa_channel;
 681         if (!sdata->local->ops->channel_switch) {
 682                 /* call "hw_config" only if doing sw channel switch */
 683                 ieee80211_hw_config(sdata->local,
 684                         IEEE80211_CONF_CHANGE_CHANNEL);
 685         } else {
 686                 /* update the device channel directly */
 687                 sdata->local->hw.conf.channel = sdata->local->_oper_channel;
 688         }
 689
 690         /* XXX: shouldn't really modify cfg80211-owned data! */
 691         ifmgd->associated->channel = sdata->local->_oper_channel;
 692
 693         /* XXX: wait for a beacon first? */
 694         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 695                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 696  out:
 697         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 698         mutex_unlock(&ifmgd->mtx);
 699 }
 700
 701 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 702 {
 703         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 704         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 705
 706         trace_api_chswitch_done(sdata, success);
 707         if (!success) {
 708                 sdata_info(sdata,
 709                            "driver channel switch failed, disconnecting\n");
 710                 ieee80211_queue_work(&sdata->local->hw,
 711                                      &ifmgd->csa_connection_drop_work);
 712         } else {
 713                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 714         }
 715 }
 716 EXPORT_SYMBOL(ieee80211_chswitch_done);
 717
 718 static void ieee80211_chswitch_timer(unsigned long data)
 719 {
 720         struct ieee80211_sub_if_data *sdata =
 721                 (struct ieee80211_sub_if_data *) data;
 722         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 723
 724         if (sdata->local->quiescing) {
 725                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 726                 return;
 727         }
 728
 729         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 730 }
 731
 732 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 733                                       struct ieee80211_channel_sw_ie *sw_elem,
 734                                       struct ieee80211_bss *bss,
 735                                       u64 timestamp)
 736 {
 737         struct cfg80211_bss *cbss =
 738                 container_of((void *)bss, struct cfg80211_bss, priv);
 739         struct ieee80211_channel *new_ch;
 740         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 741         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 742                                                       cbss->channel->band);
 743         struct ieee80211_chanctx *chanctx;
 744
 745         ASSERT_MGD_MTX(ifmgd);
 746
 747         if (!ifmgd->associated)
 748                 return;
 749
 750         if (sdata->local->scanning)
 751                 return;
 752
 753         /* Disregard subsequent beacons if we are already running a timer
 754            processing a CSA */
 755
 756         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 757                 return;
 758
 759         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 760         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) {
 761                 sdata_info(sdata,
 762                            "AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
 763                            ifmgd->associated->bssid, new_freq);
 764                 ieee80211_queue_work(&sdata->local->hw,
 765                                      &ifmgd->csa_connection_drop_work);
 766                 return;
 767         }
 768
 769         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 770
 771         if (sdata->local->use_chanctx) {
 772                 sdata_info(sdata,
 773                            "not handling channel switch with channel contexts\n");
 774                 ieee80211_queue_work(&sdata->local->hw,
 775                                      &ifmgd->csa_connection_drop_work);
 776         }
 777
 778         mutex_lock(&sdata->local->chanctx_mtx);
 779         if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
 780                 mutex_unlock(&sdata->local->chanctx_mtx);
 781                 return;
 782         }
 783         chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
 784                                struct ieee80211_chanctx, conf);
 785         if (chanctx->refcount > 1) {
 786                 sdata_info(sdata,
 787                            "channel switch with multiple interfaces on the same channel, disconnecting\n");
 788                 ieee80211_queue_work(&sdata->local->hw,
 789                                      &ifmgd->csa_connection_drop_work);
 790                 mutex_unlock(&sdata->local->chanctx_mtx);
 791                 return;
 792         }
 793         mutex_unlock(&sdata->local->chanctx_mtx);
 794
 795         sdata->local->csa_channel = new_ch;
 796
 797         if (sw_elem->mode)
 798                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 799                                 IEEE80211_QUEUE_STOP_REASON_CSA);
 800
 801         if (sdata->local->ops->channel_switch) {
 802                 /* use driver's channel switch callback */
 803                 struct ieee80211_channel_switch ch_switch = {
 804                         .timestamp = timestamp,
 805                         .block_tx = sw_elem->mode,
 806                         .channel = new_ch,
 807                         .count = sw_elem->count,
 808                 };
 809
 810                 drv_channel_switch(sdata->local, &ch_switch);
 811                 return;
 812         }
 813
 814         /* channel switch handled in software */
 815         if (sw_elem->count <= 1)
 816                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 817         else
 818                 mod_timer(&ifmgd->chswitch_timer,
 819                           TU_TO_EXP_TIME(sw_elem->count *
 820                                          cbss->beacon_interval));
 821 }
 822
 823 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 824                                         struct ieee80211_channel *channel,
 825                                         const u8 *country_ie, u8 country_ie_len,
 826                                         const u8 *pwr_constr_elem)
 827 {
 828         struct ieee80211_country_ie_triplet *triplet;
 829         int chan = ieee80211_frequency_to_channel(channel->center_freq);
 830         int i, chan_pwr, chan_increment, new_ap_level;
 831         bool have_chan_pwr = false;
 832
 833         /* Invalid IE */
 834         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
 835                 return;
 836
 837         triplet = (void *)(country_ie + 3);
 838         country_ie_len -= 3;
 839
 840         switch (channel->band) {
 841         default:
 842                 WARN_ON_ONCE(1);
 843                 /* fall through */
 844         case IEEE80211_BAND_2GHZ:
 845         case IEEE80211_BAND_60GHZ:
 846                 chan_increment = 1;
 847                 break;
 848         case IEEE80211_BAND_5GHZ:
 849                 chan_increment = 4;
 850                 break;
 851         }
 852
 853         /* find channel */
 854         while (country_ie_len >= 3) {
 855                 u8 first_channel = triplet->chans.first_channel;
 856
 857                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
 858                         goto next;
 859
 860                 for (i = 0; i < triplet->chans.num_channels; i++) {
 861                         if (first_channel + i * chan_increment == chan) {
 862                                 have_chan_pwr = true;
 863                                 chan_pwr = triplet->chans.max_power;
 864                                 break;
 865                         }
 866                 }
 867                 if (have_chan_pwr)
 868                         break;
 869
 870  next:
 871                 triplet++;
 872                 country_ie_len -= 3;
 873         }
 874
 875         if (!have_chan_pwr)
 876                 return;
 877
 878         new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
 879
 880         if (sdata->local->ap_power_level == new_ap_level)
 881                 return;
 882
 883         sdata_info(sdata,
 884                    "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
 885                    new_ap_level, chan_pwr, *pwr_constr_elem,
 886                    sdata->u.mgd.bssid);
 887         sdata->local->ap_power_level = new_ap_level;
 888         ieee80211_hw_config(sdata->local, 0);
 889 }
 890
 891 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 892 {
 893         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 894         struct ieee80211_local *local = sdata->local;
 895         struct ieee80211_conf *conf = &local->hw.conf;
 896
 897         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 898                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 899                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 900
 901         local->disable_dynamic_ps = false;
 902         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 903 }
 904 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 905
 906 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 907 {
 908         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 909         struct ieee80211_local *local = sdata->local;
 910         struct ieee80211_conf *conf = &local->hw.conf;
 911
 912         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 913                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 914                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 915
 916         local->disable_dynamic_ps = true;
 917         conf->dynamic_ps_timeout = 0;
 918         del_timer_sync(&local->dynamic_ps_timer);
 919         ieee80211_queue_work(&local->hw,
 920                              &local->dynamic_ps_enable_work);
 921 }
 922 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 923
 924 /* powersave */
 925 static void ieee80211_enable_ps(struct ieee80211_local *local,
 926                                 struct ieee80211_sub_if_data *sdata)
 927 {
 928         struct ieee80211_conf *conf = &local->hw.conf;
 929
 930         /*
 931          * If we are scanning right now then the parameters will
 932          * take effect when scan finishes.
 933          */
 934         if (local->scanning)
 935                 return;
 936
 937         if (conf->dynamic_ps_timeout > 0 &&
 938             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 939                 mod_timer(&local->dynamic_ps_timer, jiffies +
 940                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 941         } else {
 942                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 943                         ieee80211_send_nullfunc(local, sdata, 1);
 944
 945                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 946                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 947                         return;
 948
 949                 conf->flags |= IEEE80211_CONF_PS;
 950                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 951         }
 952 }
 953
 954 static void ieee80211_change_ps(struct ieee80211_local *local)
 955 {
 956         struct ieee80211_conf *conf = &local->hw.conf;
 957
 958         if (local->ps_sdata) {
 959                 ieee80211_enable_ps(local, local->ps_sdata);
 960         } else if (conf->flags & IEEE80211_CONF_PS) {
 961                 conf->flags &= ~IEEE80211_CONF_PS;
 962                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 963                 del_timer_sync(&local->dynamic_ps_timer);
 964                 cancel_work_sync(&local->dynamic_ps_enable_work);
 965         }
 966 }
 967
 968 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 969 {
 970         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 971         struct sta_info *sta = NULL;
 972         bool authorized = false;
 973
 974         if (!mgd->powersave)
 975                 return false;
 976
 977         if (mgd->broken_ap)
 978                 return false;
 979
 980         if (!mgd->associated)
 981                 return false;
 982
 983         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 984                           IEEE80211_STA_CONNECTION_POLL))
 985                 return false;
 986
 987         rcu_read_lock();
 988         sta = sta_info_get(sdata, mgd->bssid);
 989         if (sta)
 990                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 991         rcu_read_unlock();
 992
 993         return authorized;
 994 }
 995
 996 /* need to hold RTNL or interface lock */
 997 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 998 {
 999         struct ieee80211_sub_if_data *sdata, *found = NULL;
1000         int count = 0;
1001         int timeout;
1002
1003         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1004                 local->ps_sdata = NULL;
1005                 return;
1006         }
1007
1008         list_for_each_entry(sdata, &local->interfaces, list) {
1009                 if (!ieee80211_sdata_running(sdata))
1010                         continue;
1011                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1012                         /* If an AP vif is found, then disable PS
1013                          * by setting the count to zero thereby setting
1014                          * ps_sdata to NULL.
1015                          */
1016                         count = 0;
1017                         break;
1018                 }
1019                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1020                         continue;
1021                 found = sdata;
1022                 count++;
1023         }
1024
1025         if (count == 1 && ieee80211_powersave_allowed(found)) {
1026                 struct ieee80211_conf *conf = &local->hw.conf;
1027                 s32 beaconint_us;
1028
1029                 if (latency < 0)
1030                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1031
1032                 beaconint_us = ieee80211_tu_to_usec(
1033                                         found->vif.bss_conf.beacon_int);
1034
1035                 timeout = local->dynamic_ps_forced_timeout;
1036                 if (timeout < 0) {
1037                         /*
1038                          * Go to full PSM if the user configures a very low
1039                          * latency requirement.
1040                          * The 2000 second value is there for compatibility
1041                          * until the PM_QOS_NETWORK_LATENCY is configured
1042                          * with real values.
1043                          */
1044                         if (latency > (1900 * USEC_PER_MSEC) &&
1045                             latency != (2000 * USEC_PER_SEC))
1046                                 timeout = 0;
1047                         else
1048                                 timeout = 100;
1049                 }
1050                 local->dynamic_ps_user_timeout = timeout;
1051                 if (!local->disable_dynamic_ps)
1052                         conf->dynamic_ps_timeout =
1053                                 local->dynamic_ps_user_timeout;
1054
1055                 if (beaconint_us > latency) {
1056                         local->ps_sdata = NULL;
1057                 } else {
1058                         struct ieee80211_bss *bss;
1059                         int maxslp = 1;
1060                         u8 dtimper;
1061
1062                         bss = (void *)found->u.mgd.associated->priv;
1063                         dtimper = bss->dtim_period;
1064
1065                         /* If the TIM IE is invalid, pretend the value is 1 */
1066                         if (!dtimper)
1067                                 dtimper = 1;
1068                         else if (dtimper > 1)
1069                                 maxslp = min_t(int, dtimper,
1070                                                     latency / beaconint_us);
1071
1072                         local->hw.conf.max_sleep_period = maxslp;
1073                         local->hw.conf.ps_dtim_period = dtimper;
1074                         local->ps_sdata = found;
1075                 }
1076         } else {
1077                 local->ps_sdata = NULL;
1078         }
1079
1080         ieee80211_change_ps(local);
1081 }
1082
1083 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1084 {
1085         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1086
1087         if (sdata->vif.bss_conf.ps != ps_allowed) {
1088                 sdata->vif.bss_conf.ps = ps_allowed;
1089                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1090         }
1091 }
1092
1093 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1094 {
1095         struct ieee80211_local *local =
1096                 container_of(work, struct ieee80211_local,
1097                              dynamic_ps_disable_work);
1098
1099         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1100                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1101                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1102         }
1103
1104         ieee80211_wake_queues_by_reason(&local->hw,
1105                                         IEEE80211_QUEUE_STOP_REASON_PS);
1106 }
1107
1108 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1109 {
1110         struct ieee80211_local *local =
1111                 container_of(work, struct ieee80211_local,
1112                              dynamic_ps_enable_work);
1113         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1114         struct ieee80211_if_managed *ifmgd;
1115         unsigned long flags;
1116         int q;
1117
1118         /* can only happen when PS was just disabled anyway */
1119         if (!sdata)
1120                 return;
1121
1122         ifmgd = &sdata->u.mgd;
1123
1124         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1125                 return;
1126
1127         if (!local->disable_dynamic_ps &&
1128             local->hw.conf.dynamic_ps_timeout > 0) {
1129                 /* don't enter PS if TX frames are pending */
1130                 if (drv_tx_frames_pending(local)) {
1131                         mod_timer(&local->dynamic_ps_timer, jiffies +
1132                                   msecs_to_jiffies(
1133                                   local->hw.conf.dynamic_ps_timeout));
1134                         return;
1135                 }
1136
1137                 /*
1138                  * transmission can be stopped by others which leads to
1139                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1140                  * is not the actual idle state.
1141                  */
1142                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1143                 for (q = 0; q < local->hw.queues; q++) {
1144                         if (local->queue_stop_reasons[q]) {
1145                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1146                                                        flags);
1147                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1148                                           msecs_to_jiffies(
1149                                           local->hw.conf.dynamic_ps_timeout));
1150                                 return;
1151                         }
1152                 }
1153                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1154         }
1155
1156         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1157             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1158                 netif_tx_stop_all_queues(sdata->dev);
1159
1160                 if (drv_tx_frames_pending(local))
1161                         mod_timer(&local->dynamic_ps_timer, jiffies +
1162                                   msecs_to_jiffies(
1163                                   local->hw.conf.dynamic_ps_timeout));
1164                 else {
1165                         ieee80211_send_nullfunc(local, sdata, 1);
1166                         /* Flush to get the tx status of nullfunc frame */
1167                         drv_flush(local, false);
1168                 }
1169         }
1170
1171         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1172               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1173             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1174                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1175                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1176                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1177         }
1178
1179         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1180                 netif_tx_wake_all_queues(sdata->dev);
1181 }
1182
1183 void ieee80211_dynamic_ps_timer(unsigned long data)
1184 {
1185         struct ieee80211_local *local = (void *) data;
1186
1187         if (local->quiescing || local->suspended)
1188                 return;
1189
1190         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1191 }
1192
1193 /* MLME */
1194 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1195                                      struct ieee80211_sub_if_data *sdata,
1196                                      u8 *wmm_param, size_t wmm_param_len)
1197 {
1198         struct ieee80211_tx_queue_params params;
1199         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1200         size_t left;
1201         int count;
1202         u8 *pos, uapsd_queues = 0;
1203
1204         if (!local->ops->conf_tx)
1205                 return false;
1206
1207         if (local->hw.queues < IEEE80211_NUM_ACS)
1208                 return false;
1209
1210         if (!wmm_param)
1211                 return false;
1212
1213         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1214                 return false;
1215
1216         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1217                 uapsd_queues = ifmgd->uapsd_queues;
1218
1219         count = wmm_param[6] & 0x0f;
1220         if (count == ifmgd->wmm_last_param_set)
1221                 return false;
1222         ifmgd->wmm_last_param_set = count;
1223
1224         pos = wmm_param + 8;
1225         left = wmm_param_len - 8;
1226
1227         memset(&params, 0, sizeof(params));
1228
1229         sdata->wmm_acm = 0;
1230         for (; left >= 4; left -= 4, pos += 4) {
1231                 int aci = (pos[0] >> 5) & 0x03;
1232                 int acm = (pos[0] >> 4) & 0x01;
1233                 bool uapsd = false;
1234                 int queue;
1235
1236                 switch (aci) {
1237                 case 1: /* AC_BK */
1238                         queue = 3;
1239                         if (acm)
1240                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1241                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1242                                 uapsd = true;
1243                         break;
1244                 case 2: /* AC_VI */
1245                         queue = 1;
1246                         if (acm)
1247                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1248                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1249                                 uapsd = true;
1250                         break;
1251                 case 3: /* AC_VO */
1252                         queue = 0;
1253                         if (acm)
1254                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1255                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1256                                 uapsd = true;
1257                         break;
1258                 case 0: /* AC_BE */
1259                 default:
1260                         queue = 2;
1261                         if (acm)
1262                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1263                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1264                                 uapsd = true;
1265                         break;
1266                 }
1267
1268                 params.aifs = pos[0] & 0x0f;
1269                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1270                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1271                 params.txop = get_unaligned_le16(pos + 2);
1272                 params.uapsd = uapsd;
1273
1274                 mlme_dbg(sdata,
1275                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1276                          queue, aci, acm,
1277                          params.aifs, params.cw_min, params.cw_max,
1278                          params.txop, params.uapsd);
1279                 sdata->tx_conf[queue] = params;
1280                 if (drv_conf_tx(local, sdata, queue, &params))
1281                         sdata_err(sdata,
1282                                   "failed to set TX queue parameters for queue %d\n",
1283                                   queue);
1284         }
1285
1286         /* enable WMM or activate new settings */
1287         sdata->vif.bss_conf.qos = true;
1288         return true;
1289 }
1290
1291 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1292 {
1293         lockdep_assert_held(&sdata->local->mtx);
1294
1295         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1296                                 IEEE80211_STA_BEACON_POLL);
1297         ieee80211_run_deferred_scan(sdata->local);
1298 }
1299
1300 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1301 {
1302         mutex_lock(&sdata->local->mtx);
1303         __ieee80211_stop_poll(sdata);
1304         mutex_unlock(&sdata->local->mtx);
1305 }
1306
1307 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1308                                            u16 capab, bool erp_valid, u8 erp)
1309 {
1310         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1311         u32 changed = 0;
1312         bool use_protection;
1313         bool use_short_preamble;
1314         bool use_short_slot;
1315
1316         if (erp_valid) {
1317                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1318                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1319         } else {
1320                 use_protection = false;
1321                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1322         }
1323
1324         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1325         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1326                 use_short_slot = true;
1327
1328         if (use_protection != bss_conf->use_cts_prot) {
1329                 bss_conf->use_cts_prot = use_protection;
1330                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1331         }
1332
1333         if (use_short_preamble != bss_conf->use_short_preamble) {
1334                 bss_conf->use_short_preamble = use_short_preamble;
1335                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1336         }
1337
1338         if (use_short_slot != bss_conf->use_short_slot) {
1339                 bss_conf->use_short_slot = use_short_slot;
1340                 changed |= BSS_CHANGED_ERP_SLOT;
1341         }
1342
1343         return changed;
1344 }
1345
1346 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1347                                      struct cfg80211_bss *cbss,
1348                                      u32 bss_info_changed)
1349 {
1350         struct ieee80211_bss *bss = (void *)cbss->priv;
1351         struct ieee80211_local *local = sdata->local;
1352         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1353
1354         bss_info_changed |= BSS_CHANGED_ASSOC;
1355         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1356                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1357
1358         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1359                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1360
1361         sdata->u.mgd.associated = cbss;
1362         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1363
1364         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1365
1366         /* just to be sure */
1367         ieee80211_stop_poll(sdata);
1368
1369         ieee80211_led_assoc(local, 1);
1370
1371         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1372                 bss_conf->dtim_period = bss->dtim_period;
1373         else
1374                 bss_conf->dtim_period = 0;
1375
1376         bss_conf->assoc = 1;
1377
1378         /* Tell the driver to monitor connection quality (if supported) */
1379         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1380             bss_conf->cqm_rssi_thold)
1381                 bss_info_changed |= BSS_CHANGED_CQM;
1382
1383         /* Enable ARP filtering */
1384         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1385                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1386                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1387         }
1388
1389         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1390
1391         mutex_lock(&local->iflist_mtx);
1392         ieee80211_recalc_ps(local, -1);
1393         mutex_unlock(&local->iflist_mtx);
1394
1395         ieee80211_recalc_smps(sdata);
1396         ieee80211_recalc_ps_vif(sdata);
1397
1398         netif_tx_start_all_queues(sdata->dev);
1399         netif_carrier_on(sdata->dev);
1400 }
1401
1402 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1403                                    u16 stype, u16 reason, bool tx,
1404                                    u8 *frame_buf)
1405 {
1406         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1407         struct ieee80211_local *local = sdata->local;
1408         struct sta_info *sta;
1409         u32 changed = 0;
1410
1411         ASSERT_MGD_MTX(ifmgd);
1412
1413         if (WARN_ON_ONCE(tx && !frame_buf))
1414                 return;
1415
1416         if (WARN_ON(!ifmgd->associated))
1417                 return;
1418
1419         ieee80211_stop_poll(sdata);
1420
1421         ifmgd->associated = NULL;
1422
1423         /*
1424          * we need to commit the associated = NULL change because the
1425          * scan code uses that to determine whether this iface should
1426          * go to/wake up from powersave or not -- and could otherwise
1427          * wake the queues erroneously.
1428          */
1429         smp_mb();
1430
1431         /*
1432          * Thus, we can only afterwards stop the queues -- to account
1433          * for the case where another CPU is finishing a scan at this
1434          * time -- we don't want the scan code to enable queues.
1435          */
1436
1437         netif_tx_stop_all_queues(sdata->dev);
1438         netif_carrier_off(sdata->dev);
1439
1440         mutex_lock(&local->sta_mtx);
1441         sta = sta_info_get(sdata, ifmgd->bssid);
1442         if (sta) {
1443                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1444                 ieee80211_sta_tear_down_BA_sessions(sta, false);
1445         }
1446         mutex_unlock(&local->sta_mtx);
1447
1448         /*
1449          * if we want to get out of ps before disassoc (why?) we have
1450          * to do it before sending disassoc, as otherwise the null-packet
1451          * won't be valid.
1452          */
1453         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1454                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1455                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1456         }
1457         local->ps_sdata = NULL;
1458
1459         /* disable per-vif ps */
1460         ieee80211_recalc_ps_vif(sdata);
1461
1462         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1463         if (tx)
1464                 drv_flush(local, false);
1465
1466         /* deauthenticate/disassociate now */
1467         if (tx || frame_buf)
1468                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1469                                                reason, tx, frame_buf);
1470
1471         /* flush out frame */
1472         if (tx)
1473                 drv_flush(local, false);
1474
1475         /* clear bssid only after building the needed mgmt frames */
1476         memset(ifmgd->bssid, 0, ETH_ALEN);
1477
1478         /* remove AP and TDLS peers */
1479         sta_info_flush(local, sdata);
1480
1481         /* finally reset all BSS / config parameters */
1482         changed |= ieee80211_reset_erp_info(sdata);
1483
1484         ieee80211_led_assoc(local, 0);
1485         changed |= BSS_CHANGED_ASSOC;
1486         sdata->vif.bss_conf.assoc = false;
1487
1488         /* on the next assoc, re-program HT parameters */
1489         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1490         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1491
1492         local->ap_power_level = 0;
1493
1494         del_timer_sync(&local->dynamic_ps_timer);
1495         cancel_work_sync(&local->dynamic_ps_enable_work);
1496
1497         /* Disable ARP filtering */
1498         if (sdata->vif.bss_conf.arp_filter_enabled) {
1499                 sdata->vif.bss_conf.arp_filter_enabled = false;
1500                 changed |= BSS_CHANGED_ARP_FILTER;
1501         }
1502
1503         sdata->vif.bss_conf.qos = false;
1504         changed |= BSS_CHANGED_QOS;
1505
1506         /* The BSSID (not really interesting) and HT changed */
1507         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1508         ieee80211_bss_info_change_notify(sdata, changed);
1509
1510         ieee80211_vif_release_channel(sdata);
1511
1512         /* disassociated - set to defaults now */
1513         ieee80211_set_wmm_default(sdata, false);
1514
1515         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1516         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1517         del_timer_sync(&sdata->u.mgd.timer);
1518         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1519
1520         sdata->u.mgd.timers_running = 0;
1521 }
1522
1523 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1524                              struct ieee80211_hdr *hdr)
1525 {
1526         /*
1527          * We can postpone the mgd.timer whenever receiving unicast frames
1528          * from AP because we know that the connection is working both ways
1529          * at that time. But multicast frames (and hence also beacons) must
1530          * be ignored here, because we need to trigger the timer during
1531          * data idle periods for sending the periodic probe request to the
1532          * AP we're connected to.
1533          */
1534         if (is_multicast_ether_addr(hdr->addr1))
1535                 return;
1536
1537         ieee80211_sta_reset_conn_monitor(sdata);
1538 }
1539
1540 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1541 {
1542         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1543         struct ieee80211_local *local = sdata->local;
1544
1545         mutex_lock(&local->mtx);
1546         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1547                               IEEE80211_STA_CONNECTION_POLL))) {
1548                 mutex_unlock(&local->mtx);
1549                 return;
1550         }
1551
1552         __ieee80211_stop_poll(sdata);
1553
1554         mutex_lock(&local->iflist_mtx);
1555         ieee80211_recalc_ps(local, -1);
1556         mutex_unlock(&local->iflist_mtx);
1557
1558         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1559                 goto out;
1560
1561         /*
1562          * We've received a probe response, but are not sure whether
1563          * we have or will be receiving any beacons or data, so let's
1564          * schedule the timers again, just in case.
1565          */
1566         ieee80211_sta_reset_beacon_monitor(sdata);
1567
1568         mod_timer(&ifmgd->conn_mon_timer,
1569                   round_jiffies_up(jiffies +
1570                                    IEEE80211_CONNECTION_IDLE_TIME));
1571 out:
1572         mutex_unlock(&local->mtx);
1573 }
1574
1575 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1576                              struct ieee80211_hdr *hdr, bool ack)
1577 {
1578         if (!ieee80211_is_data(hdr->frame_control))
1579             return;
1580
1581         if (ack)
1582                 ieee80211_sta_reset_conn_monitor(sdata);
1583
1584         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1585             sdata->u.mgd.probe_send_count > 0) {
1586                 if (ack)
1587                         sdata->u.mgd.probe_send_count = 0;
1588                 else
1589                         sdata->u.mgd.nullfunc_failed = true;
1590                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1591         }
1592 }
1593
1594 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1595 {
1596         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1597         const u8 *ssid;
1598         u8 *dst = ifmgd->associated->bssid;
1599         u8 unicast_limit = max(1, max_probe_tries - 3);
1600
1601         /*
1602          * Try sending broadcast probe requests for the last three
1603          * probe requests after the first ones failed since some
1604          * buggy APs only support broadcast probe requests.
1605          */
1606         if (ifmgd->probe_send_count >= unicast_limit)
1607                 dst = NULL;
1608
1609         /*
1610          * When the hardware reports an accurate Tx ACK status, it's
1611          * better to send a nullfunc frame instead of a probe request,
1612          * as it will kick us off the AP quickly if we aren't associated
1613          * anymore. The timeout will be reset if the frame is ACKed by
1614          * the AP.
1615          */
1616         ifmgd->probe_send_count++;
1617
1618         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1619                 ifmgd->nullfunc_failed = false;
1620                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1621         } else {
1622                 int ssid_len;
1623
1624                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1625                 if (WARN_ON_ONCE(ssid == NULL))
1626                         ssid_len = 0;
1627                 else
1628                         ssid_len = ssid[1];
1629
1630                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1631                                          0, (u32) -1, true, false,
1632                                          ifmgd->associated->channel, false);
1633         }
1634
1635         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1636         run_again(ifmgd, ifmgd->probe_timeout);
1637         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1638                 drv_flush(sdata->local, false);
1639 }
1640
1641 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1642                                    bool beacon)
1643 {
1644         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1645         bool already = false;
1646
1647         if (!ieee80211_sdata_running(sdata))
1648                 return;
1649
1650         mutex_lock(&ifmgd->mtx);
1651
1652         if (!ifmgd->associated)
1653                 goto out;
1654
1655         mutex_lock(&sdata->local->mtx);
1656
1657         if (sdata->local->tmp_channel || sdata->local->scanning) {
1658                 mutex_unlock(&sdata->local->mtx);
1659                 goto out;
1660         }
1661
1662         if (beacon)
1663                 mlme_dbg_ratelimited(sdata,
1664                                      "detected beacon loss from AP - sending probe request\n");
1665
1666         ieee80211_cqm_rssi_notify(&sdata->vif,
1667                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1668
1669         /*
1670          * The driver/our work has already reported this event or the
1671          * connection monitoring has kicked in and we have already sent
1672          * a probe request. Or maybe the AP died and the driver keeps
1673          * reporting until we disassociate...
1674          *
1675          * In either case we have to ignore the current call to this
1676          * function (except for setting the correct probe reason bit)
1677          * because otherwise we would reset the timer every time and
1678          * never check whether we received a probe response!
1679          */
1680         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1681                             IEEE80211_STA_CONNECTION_POLL))
1682                 already = true;
1683
1684         if (beacon)
1685                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1686         else
1687                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1688
1689         mutex_unlock(&sdata->local->mtx);
1690
1691         if (already)
1692                 goto out;
1693
1694         mutex_lock(&sdata->local->iflist_mtx);
1695         ieee80211_recalc_ps(sdata->local, -1);
1696         mutex_unlock(&sdata->local->iflist_mtx);
1697
1698         ifmgd->probe_send_count = 0;
1699         ieee80211_mgd_probe_ap_send(sdata);
1700  out:
1701         mutex_unlock(&ifmgd->mtx);
1702 }
1703
1704 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1705                                           struct ieee80211_vif *vif)
1706 {
1707         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1708         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1709         struct cfg80211_bss *cbss;
1710         struct sk_buff *skb;
1711         const u8 *ssid;
1712         int ssid_len;
1713
1714         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1715                 return NULL;
1716
1717         ASSERT_MGD_MTX(ifmgd);
1718
1719         if (ifmgd->associated)
1720                 cbss = ifmgd->associated;
1721         else if (ifmgd->auth_data)
1722                 cbss = ifmgd->auth_data->bss;
1723         else if (ifmgd->assoc_data)
1724                 cbss = ifmgd->assoc_data->bss;
1725         else
1726                 return NULL;
1727
1728         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1729         if (WARN_ON_ONCE(ssid == NULL))
1730                 ssid_len = 0;
1731         else
1732                 ssid_len = ssid[1];
1733
1734         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1735                                         (u32) -1, cbss->channel,
1736                                         ssid + 2, ssid_len,
1737                                         NULL, 0, true);
1738
1739         return skb;
1740 }
1741 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1742
1743 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata,
1744                                    bool transmit_frame)
1745 {
1746         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1747         struct ieee80211_local *local = sdata->local;
1748         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1749
1750         mutex_lock(&ifmgd->mtx);
1751         if (!ifmgd->associated) {
1752                 mutex_unlock(&ifmgd->mtx);
1753                 return;
1754         }
1755
1756         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1757                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1758                                transmit_frame, frame_buf);
1759         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
1760         mutex_unlock(&ifmgd->mtx);
1761
1762         /*
1763          * must be outside lock due to cfg80211,
1764          * but that's not a problem.
1765          */
1766         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
1767
1768         mutex_lock(&local->mtx);
1769         ieee80211_recalc_idle(local);
1770         mutex_unlock(&local->mtx);
1771 }
1772
1773 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1774 {
1775         struct ieee80211_sub_if_data *sdata =
1776                 container_of(work, struct ieee80211_sub_if_data,
1777                              u.mgd.beacon_connection_loss_work);
1778         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1779         struct sta_info *sta;
1780
1781         if (ifmgd->associated) {
1782                 rcu_read_lock();
1783                 sta = sta_info_get(sdata, ifmgd->bssid);
1784                 if (sta)
1785                         sta->beacon_loss_count++;
1786                 rcu_read_unlock();
1787         }
1788
1789         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) {
1790                 sdata_info(sdata, "Connection to AP %pM lost\n",
1791                            ifmgd->bssid);
1792                 __ieee80211_disconnect(sdata, false);
1793         } else {
1794                 ieee80211_mgd_probe_ap(sdata, true);
1795         }
1796 }
1797
1798 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
1799 {
1800         struct ieee80211_sub_if_data *sdata =
1801                 container_of(work, struct ieee80211_sub_if_data,
1802                              u.mgd.csa_connection_drop_work);
1803
1804         ieee80211_wake_queues_by_reason(&sdata->local->hw,
1805                                         IEEE80211_QUEUE_STOP_REASON_CSA);
1806         __ieee80211_disconnect(sdata, true);
1807 }
1808
1809 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1810 {
1811         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1812         struct ieee80211_hw *hw = &sdata->local->hw;
1813
1814         trace_api_beacon_loss(sdata);
1815
1816         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1817         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1818 }
1819 EXPORT_SYMBOL(ieee80211_beacon_loss);
1820
1821 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1822 {
1823         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1824         struct ieee80211_hw *hw = &sdata->local->hw;
1825
1826         trace_api_connection_loss(sdata);
1827
1828         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1829         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1830 }
1831 EXPORT_SYMBOL(ieee80211_connection_loss);
1832
1833
1834 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1835                                         bool assoc)
1836 {
1837         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1838
1839         lockdep_assert_held(&sdata->u.mgd.mtx);
1840
1841         if (!assoc) {
1842                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1843
1844                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1845                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1846                 ieee80211_vif_release_channel(sdata);
1847         }
1848
1849         cfg80211_put_bss(auth_data->bss);
1850         kfree(auth_data);
1851         sdata->u.mgd.auth_data = NULL;
1852 }
1853
1854 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1855                                      struct ieee80211_mgmt *mgmt, size_t len)
1856 {
1857         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1858         u8 *pos;
1859         struct ieee802_11_elems elems;
1860
1861         pos = mgmt->u.auth.variable;
1862         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1863         if (!elems.challenge)
1864                 return;
1865         auth_data->expected_transaction = 4;
1866         drv_mgd_prepare_tx(sdata->local, sdata);
1867         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
1868                             elems.challenge - 2, elems.challenge_len + 2,
1869                             auth_data->bss->bssid, auth_data->bss->bssid,
1870                             auth_data->key, auth_data->key_len,
1871                             auth_data->key_idx);
1872 }
1873
1874 static enum rx_mgmt_action __must_check
1875 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1876                        struct ieee80211_mgmt *mgmt, size_t len)
1877 {
1878         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1879         u8 bssid[ETH_ALEN];
1880         u16 auth_alg, auth_transaction, status_code;
1881         struct sta_info *sta;
1882
1883         lockdep_assert_held(&ifmgd->mtx);
1884
1885         if (len < 24 + 6)
1886                 return RX_MGMT_NONE;
1887
1888         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1889                 return RX_MGMT_NONE;
1890
1891         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1892
1893         if (!ether_addr_equal(bssid, mgmt->bssid))
1894                 return RX_MGMT_NONE;
1895
1896         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1897         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1898         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1899
1900         if (auth_alg != ifmgd->auth_data->algorithm ||
1901             auth_transaction != ifmgd->auth_data->expected_transaction)
1902                 return RX_MGMT_NONE;
1903
1904         if (status_code != WLAN_STATUS_SUCCESS) {
1905                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
1906                            mgmt->sa, status_code);
1907                 ieee80211_destroy_auth_data(sdata, false);
1908                 return RX_MGMT_CFG80211_RX_AUTH;
1909         }
1910
1911         switch (ifmgd->auth_data->algorithm) {
1912         case WLAN_AUTH_OPEN:
1913         case WLAN_AUTH_LEAP:
1914         case WLAN_AUTH_FT:
1915                 break;
1916         case WLAN_AUTH_SHARED_KEY:
1917                 if (ifmgd->auth_data->expected_transaction != 4) {
1918                         ieee80211_auth_challenge(sdata, mgmt, len);
1919                         /* need another frame */
1920                         return RX_MGMT_NONE;
1921                 }
1922                 break;
1923         default:
1924                 WARN_ONCE(1, "invalid auth alg %d",
1925                           ifmgd->auth_data->algorithm);
1926                 return RX_MGMT_NONE;
1927         }
1928
1929         sdata_info(sdata, "authenticated\n");
1930         ifmgd->auth_data->done = true;
1931         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1932         run_again(ifmgd, ifmgd->auth_data->timeout);
1933
1934         /* move station state to auth */
1935         mutex_lock(&sdata->local->sta_mtx);
1936         sta = sta_info_get(sdata, bssid);
1937         if (!sta) {
1938                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1939                 goto out_err;
1940         }
1941         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1942                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
1943                 goto out_err;
1944         }
1945         mutex_unlock(&sdata->local->sta_mtx);
1946
1947         return RX_MGMT_CFG80211_RX_AUTH;
1948  out_err:
1949         mutex_unlock(&sdata->local->sta_mtx);
1950         /* ignore frame -- wait for timeout */
1951         return RX_MGMT_NONE;
1952 }
1953
1954
1955 static enum rx_mgmt_action __must_check
1956 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1957                          struct ieee80211_mgmt *mgmt, size_t len)
1958 {
1959         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1960         const u8 *bssid = NULL;
1961         u16 reason_code;
1962
1963         lockdep_assert_held(&ifmgd->mtx);
1964
1965         if (len < 24 + 2)
1966                 return RX_MGMT_NONE;
1967
1968         if (!ifmgd->associated ||
1969             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1970                 return RX_MGMT_NONE;
1971
1972         bssid = ifmgd->associated->bssid;
1973
1974         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1975
1976         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
1977                    bssid, reason_code);
1978
1979         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1980
1981         mutex_lock(&sdata->local->mtx);
1982         ieee80211_recalc_idle(sdata->local);
1983         mutex_unlock(&sdata->local->mtx);
1984
1985         return RX_MGMT_CFG80211_DEAUTH;
1986 }
1987
1988
1989 static enum rx_mgmt_action __must_check
1990 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1991                            struct ieee80211_mgmt *mgmt, size_t len)
1992 {
1993         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1994         u16 reason_code;
1995
1996         lockdep_assert_held(&ifmgd->mtx);
1997
1998         if (len < 24 + 2)
1999                 return RX_MGMT_NONE;
2000
2001         if (!ifmgd->associated ||
2002             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2003                 return RX_MGMT_NONE;
2004
2005         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2006
2007         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2008                    mgmt->sa, reason_code);
2009
2010         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2011
2012         mutex_lock(&sdata->local->mtx);
2013         ieee80211_recalc_idle(sdata->local);
2014         mutex_unlock(&sdata->local->mtx);
2015
2016         return RX_MGMT_CFG80211_DISASSOC;
2017 }
2018
2019 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2020                                 u8 *supp_rates, unsigned int supp_rates_len,
2021                                 u32 *rates, u32 *basic_rates,
2022                                 bool *have_higher_than_11mbit,
2023                                 int *min_rate, int *min_rate_index)
2024 {
2025         int i, j;
2026
2027         for (i = 0; i < supp_rates_len; i++) {
2028                 int rate = (supp_rates[i] & 0x7f) * 5;
2029                 bool is_basic = !!(supp_rates[i] & 0x80);
2030
2031                 if (rate > 110)
2032                         *have_higher_than_11mbit = true;
2033
2034                 /*
2035                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2036                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2037                  *
2038                  * Note: Even through the membership selector and the basic
2039                  *       rate flag share the same bit, they are not exactly
2040                  *       the same.
2041                  */
2042                 if (!!(supp_rates[i] & 0x80) &&
2043                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2044                         continue;
2045
2046                 for (j = 0; j < sband->n_bitrates; j++) {
2047                         if (sband->bitrates[j].bitrate == rate) {
2048                                 *rates |= BIT(j);
2049                                 if (is_basic)
2050                                         *basic_rates |= BIT(j);
2051                                 if (rate < *min_rate) {
2052                                         *min_rate = rate;
2053                                         *min_rate_index = j;
2054                                 }
2055                                 break;
2056                         }
2057                 }
2058         }
2059 }
2060
2061 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2062                                          bool assoc)
2063 {
2064         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2065
2066         lockdep_assert_held(&sdata->u.mgd.mtx);
2067
2068         if (!assoc) {
2069                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2070
2071                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2072                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2073                 ieee80211_vif_release_channel(sdata);
2074         }
2075
2076         kfree(assoc_data);
2077         sdata->u.mgd.assoc_data = NULL;
2078 }
2079
2080 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2081                                     struct cfg80211_bss *cbss,
2082                                     struct ieee80211_mgmt *mgmt, size_t len)
2083 {
2084         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2085         struct ieee80211_local *local = sdata->local;
2086         struct ieee80211_supported_band *sband;
2087         struct sta_info *sta;
2088         u8 *pos;
2089         u16 capab_info, aid;
2090         struct ieee802_11_elems elems;
2091         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2092         u32 changed = 0;
2093         int err;
2094
2095         /* AssocResp and ReassocResp have identical structure */
2096
2097         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2098         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2099
2100         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2101                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2102                            aid);
2103         aid &= ~(BIT(15) | BIT(14));
2104
2105         ifmgd->broken_ap = false;
2106
2107         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2108                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2109                            aid);
2110                 aid = 0;
2111                 ifmgd->broken_ap = true;
2112         }
2113
2114         pos = mgmt->u.assoc_resp.variable;
2115         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2116
2117         if (!elems.supp_rates) {
2118                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2119                 return false;
2120         }
2121
2122         ifmgd->aid = aid;
2123
2124         mutex_lock(&sdata->local->sta_mtx);
2125         /*
2126          * station info was already allocated and inserted before
2127          * the association and should be available to us
2128          */
2129         sta = sta_info_get(sdata, cbss->bssid);
2130         if (WARN_ON(!sta)) {
2131                 mutex_unlock(&sdata->local->sta_mtx);
2132                 return false;
2133         }
2134
2135         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2136
2137         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2138                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2139                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2140
2141         sta->supports_40mhz =
2142                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2143
2144         rate_control_rate_init(sta);
2145
2146         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2147                 set_sta_flag(sta, WLAN_STA_MFP);
2148
2149         if (elems.wmm_param)
2150                 set_sta_flag(sta, WLAN_STA_WME);
2151
2152         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2153         if (!err)
2154                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2155         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2156                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2157         if (err) {
2158                 sdata_info(sdata,
2159                            "failed to move station %pM to desired state\n",
2160                            sta->sta.addr);
2161                 WARN_ON(__sta_info_destroy(sta));
2162                 mutex_unlock(&sdata->local->sta_mtx);
2163                 return false;
2164         }
2165
2166         mutex_unlock(&sdata->local->sta_mtx);
2167
2168         /*
2169          * Always handle WMM once after association regardless
2170          * of the first value the AP uses. Setting -1 here has
2171          * that effect because the AP values is an unsigned
2172          * 4-bit value.
2173          */
2174         ifmgd->wmm_last_param_set = -1;
2175
2176         if (elems.wmm_param)
2177                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2178                                          elems.wmm_param_len);
2179         else
2180                 ieee80211_set_wmm_default(sdata, false);
2181         changed |= BSS_CHANGED_QOS;
2182
2183         if (elems.ht_operation && elems.wmm_param &&
2184             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2185                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2186                                                   cbss->bssid, false);
2187
2188         /* set AID and assoc capability,
2189          * ieee80211_set_associated() will tell the driver */
2190         bss_conf->aid = aid;
2191         bss_conf->assoc_capability = capab_info;
2192         ieee80211_set_associated(sdata, cbss, changed);
2193
2194         /*
2195          * If we're using 4-addr mode, let the AP know that we're
2196          * doing so, so that it can create the STA VLAN on its side
2197          */
2198         if (ifmgd->use_4addr)
2199                 ieee80211_send_4addr_nullfunc(local, sdata);
2200
2201         /*
2202          * Start timer to probe the connection to the AP now.
2203          * Also start the timer that will detect beacon loss.
2204          */
2205         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2206         ieee80211_sta_reset_beacon_monitor(sdata);
2207
2208         return true;
2209 }
2210
2211 static enum rx_mgmt_action __must_check
2212 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2213                              struct ieee80211_mgmt *mgmt, size_t len,
2214                              struct cfg80211_bss **bss)
2215 {
2216         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2217         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2218         u16 capab_info, status_code, aid;
2219         struct ieee802_11_elems elems;
2220         u8 *pos;
2221         bool reassoc;
2222
2223         lockdep_assert_held(&ifmgd->mtx);
2224
2225         if (!assoc_data)
2226                 return RX_MGMT_NONE;
2227         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2228                 return RX_MGMT_NONE;
2229
2230         /*
2231          * AssocResp and ReassocResp have identical structure, so process both
2232          * of them in this function.
2233          */
2234
2235         if (len < 24 + 6)
2236                 return RX_MGMT_NONE;
2237
2238         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2239         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2240         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2241         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2242
2243         sdata_info(sdata,
2244                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2245                    reassoc ? "Rea" : "A", mgmt->sa,
2246                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2247
2248         pos = mgmt->u.assoc_resp.variable;
2249         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2250
2251         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2252             elems.timeout_int && elems.timeout_int_len == 5 &&
2253             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2254                 u32 tu, ms;
2255                 tu = get_unaligned_le32(elems.timeout_int + 1);
2256                 ms = tu * 1024 / 1000;
2257                 sdata_info(sdata,
2258                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2259                            mgmt->sa, tu, ms);
2260                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2261                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2262                         run_again(ifmgd, assoc_data->timeout);
2263                 return RX_MGMT_NONE;
2264         }
2265
2266         *bss = assoc_data->bss;
2267
2268         if (status_code != WLAN_STATUS_SUCCESS) {
2269                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2270                            mgmt->sa, status_code);
2271                 ieee80211_destroy_assoc_data(sdata, false);
2272         } else {
2273                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2274                         /* oops -- internal error -- send timeout for now */
2275                         ieee80211_destroy_assoc_data(sdata, false);
2276                         cfg80211_put_bss(*bss);
2277                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2278                 }
2279                 sdata_info(sdata, "associated\n");
2280
2281                 /*
2282                  * destroy assoc_data afterwards, as otherwise an idle
2283                  * recalc after assoc_data is NULL but before associated
2284                  * is set can cause the interface to go idle
2285                  */
2286                 ieee80211_destroy_assoc_data(sdata, true);
2287         }
2288
2289         return RX_MGMT_CFG80211_RX_ASSOC;
2290 }
2291 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2292                                   struct ieee80211_mgmt *mgmt,
2293                                   size_t len,
2294                                   struct ieee80211_rx_status *rx_status,
2295                                   struct ieee802_11_elems *elems,
2296                                   bool beacon)
2297 {
2298         struct ieee80211_local *local = sdata->local;
2299         int freq;
2300         struct ieee80211_bss *bss;
2301         struct ieee80211_channel *channel;
2302         bool need_ps = false;
2303
2304         if (sdata->u.mgd.associated &&
2305             ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2306                 bss = (void *)sdata->u.mgd.associated->priv;
2307                 /* not previously set so we may need to recalc */
2308                 need_ps = !bss->dtim_period;
2309         }
2310
2311         if (elems->ds_params && elems->ds_params_len == 1)
2312                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2313                                                       rx_status->band);
2314         else
2315                 freq = rx_status->freq;
2316
2317         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2318
2319         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2320                 return;
2321
2322         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2323                                         channel, beacon);
2324         if (bss)
2325                 ieee80211_rx_bss_put(local, bss);
2326
2327         if (!sdata->u.mgd.associated)
2328                 return;
2329
2330         if (need_ps) {
2331                 mutex_lock(&local->iflist_mtx);
2332                 ieee80211_recalc_ps(local, -1);
2333                 mutex_unlock(&local->iflist_mtx);
2334         }
2335
2336         if (elems->ch_switch_ie &&
2337             memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, ETH_ALEN) == 0)
2338                 ieee80211_sta_process_chanswitch(sdata, elems->ch_switch_ie,
2339                                                  bss, rx_status->mactime);
2340 }
2341
2342
2343 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2344                                          struct sk_buff *skb)
2345 {
2346         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2347         struct ieee80211_if_managed *ifmgd;
2348         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2349         size_t baselen, len = skb->len;
2350         struct ieee802_11_elems elems;
2351
2352         ifmgd = &sdata->u.mgd;
2353
2354         ASSERT_MGD_MTX(ifmgd);
2355
2356         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2357                 return; /* ignore ProbeResp to foreign address */
2358
2359         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2360         if (baselen > len)
2361                 return;
2362
2363         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2364                                 &elems);
2365
2366         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2367
2368         if (ifmgd->associated &&
2369             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2370                 ieee80211_reset_ap_probe(sdata);
2371
2372         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2373             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2374                 /* got probe response, continue with auth */
2375                 sdata_info(sdata, "direct probe responded\n");
2376                 ifmgd->auth_data->tries = 0;
2377                 ifmgd->auth_data->timeout = jiffies;
2378                 run_again(ifmgd, ifmgd->auth_data->timeout);
2379         }
2380 }
2381
2382 /*
2383  * This is the canonical list of information elements we care about,
2384  * the filter code also gives us all changes to the Microsoft OUI
2385  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2386  *
2387  * We implement beacon filtering in software since that means we can
2388  * avoid processing the frame here and in cfg80211, and userspace
2389  * will not be able to tell whether the hardware supports it or not.
2390  *
2391  * XXX: This list needs to be dynamic -- userspace needs to be able to
2392  *      add items it requires. It also needs to be able to tell us to
2393  *      look out for other vendor IEs.
2394  */
2395 static const u64 care_about_ies =
2396         (1ULL << WLAN_EID_COUNTRY) |
2397         (1ULL << WLAN_EID_ERP_INFO) |
2398         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2399         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2400         (1ULL << WLAN_EID_HT_CAPABILITY) |
2401         (1ULL << WLAN_EID_HT_OPERATION);
2402
2403 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2404                                      struct ieee80211_mgmt *mgmt,
2405                                      size_t len,
2406                                      struct ieee80211_rx_status *rx_status)
2407 {
2408         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2409         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2410         size_t baselen;
2411         struct ieee802_11_elems elems;
2412         struct ieee80211_local *local = sdata->local;
2413         struct ieee80211_chanctx_conf *chanctx_conf;
2414         struct ieee80211_channel *chan;
2415         u32 changed = 0;
2416         bool erp_valid, directed_tim = false;
2417         u8 erp_value = 0;
2418         u32 ncrc;
2419         u8 *bssid;
2420
2421         lockdep_assert_held(&ifmgd->mtx);
2422
2423         /* Process beacon from the current BSS */
2424         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2425         if (baselen > len)
2426                 return;
2427
2428         rcu_read_lock();
2429         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2430         if (!chanctx_conf) {
2431                 rcu_read_unlock();
2432                 return;
2433         }
2434
2435         if (rx_status->freq != chanctx_conf->channel->center_freq) {
2436                 rcu_read_unlock();
2437                 return;
2438         }
2439         chan = chanctx_conf->channel;
2440         rcu_read_unlock();
2441
2442         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2443             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2444                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2445                                        len - baselen, &elems);
2446
2447                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2448                                       false);
2449                 ifmgd->assoc_data->have_beacon = true;
2450                 ifmgd->assoc_data->sent_assoc = false;
2451                 /* continue assoc process */
2452                 ifmgd->assoc_data->timeout = jiffies;
2453                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2454                 return;
2455         }
2456
2457         if (!ifmgd->associated ||
2458             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2459                 return;
2460         bssid = ifmgd->associated->bssid;
2461
2462         /* Track average RSSI from the Beacon frames of the current AP */
2463         ifmgd->last_beacon_signal = rx_status->signal;
2464         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2465                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2466                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2467                 ifmgd->last_cqm_event_signal = 0;
2468                 ifmgd->count_beacon_signal = 1;
2469                 ifmgd->last_ave_beacon_signal = 0;
2470         } else {
2471                 ifmgd->ave_beacon_signal =
2472                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2473                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2474                          ifmgd->ave_beacon_signal) / 16;
2475                 ifmgd->count_beacon_signal++;
2476         }
2477
2478         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2479             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2480                 int sig = ifmgd->ave_beacon_signal;
2481                 int last_sig = ifmgd->last_ave_beacon_signal;
2482
2483                 /*
2484                  * if signal crosses either of the boundaries, invoke callback
2485                  * with appropriate parameters
2486                  */
2487                 if (sig > ifmgd->rssi_max_thold &&
2488                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2489                         ifmgd->last_ave_beacon_signal = sig;
2490                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2491                 } else if (sig < ifmgd->rssi_min_thold &&
2492                            (last_sig >= ifmgd->rssi_max_thold ||
2493                            last_sig == 0)) {
2494                         ifmgd->last_ave_beacon_signal = sig;
2495                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2496                 }
2497         }
2498
2499         if (bss_conf->cqm_rssi_thold &&
2500             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2501             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2502                 int sig = ifmgd->ave_beacon_signal / 16;
2503                 int last_event = ifmgd->last_cqm_event_signal;
2504                 int thold = bss_conf->cqm_rssi_thold;
2505                 int hyst = bss_conf->cqm_rssi_hyst;
2506                 if (sig < thold &&
2507                     (last_event == 0 || sig < last_event - hyst)) {
2508                         ifmgd->last_cqm_event_signal = sig;
2509                         ieee80211_cqm_rssi_notify(
2510                                 &sdata->vif,
2511                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2512                                 GFP_KERNEL);
2513                 } else if (sig > thold &&
2514                            (last_event == 0 || sig > last_event + hyst)) {
2515                         ifmgd->last_cqm_event_signal = sig;
2516                         ieee80211_cqm_rssi_notify(
2517                                 &sdata->vif,
2518                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2519                                 GFP_KERNEL);
2520                 }
2521         }
2522
2523         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2524                 mlme_dbg_ratelimited(sdata,
2525                                      "cancelling probereq poll due to a received beacon\n");
2526                 mutex_lock(&local->mtx);
2527                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2528                 ieee80211_run_deferred_scan(local);
2529                 mutex_unlock(&local->mtx);
2530
2531                 mutex_lock(&local->iflist_mtx);
2532                 ieee80211_recalc_ps(local, -1);
2533                 mutex_unlock(&local->iflist_mtx);
2534         }
2535
2536         /*
2537          * Push the beacon loss detection into the future since
2538          * we are processing a beacon from the AP just now.
2539          */
2540         ieee80211_sta_reset_beacon_monitor(sdata);
2541
2542         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2543         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2544                                           len - baselen, &elems,
2545                                           care_about_ies, ncrc);
2546
2547         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2548                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2549                                                    ifmgd->aid);
2550
2551         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2552                 if (directed_tim) {
2553                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2554                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2555                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2556                                         ieee80211_hw_config(local,
2557                                                             IEEE80211_CONF_CHANGE_PS);
2558                                 }
2559                                 ieee80211_send_nullfunc(local, sdata, 0);
2560                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2561                                 local->pspolling = true;
2562
2563                                 /*
2564                                  * Here is assumed that the driver will be
2565                                  * able to send ps-poll frame and receive a
2566                                  * response even though power save mode is
2567                                  * enabled, but some drivers might require
2568                                  * to disable power save here. This needs
2569                                  * to be investigated.
2570                                  */
2571                                 ieee80211_send_pspoll(local, sdata);
2572                         }
2573                 }
2574         }
2575
2576         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2577                 return;
2578         ifmgd->beacon_crc = ncrc;
2579         ifmgd->beacon_crc_valid = true;
2580
2581         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2582                               true);
2583
2584         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2585                                      elems.wmm_param_len))
2586                 changed |= BSS_CHANGED_QOS;
2587
2588         if (elems.erp_info && elems.erp_info_len >= 1) {
2589                 erp_valid = true;
2590                 erp_value = elems.erp_info[0];
2591         } else {
2592                 erp_valid = false;
2593         }
2594         changed |= ieee80211_handle_bss_capability(sdata,
2595                         le16_to_cpu(mgmt->u.beacon.capab_info),
2596                         erp_valid, erp_value);
2597
2598
2599         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2600             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2601                 struct ieee80211_supported_band *sband;
2602
2603                 sband = local->hw.wiphy->bands[chan->band];
2604
2605                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2606                                                   bssid, true);
2607         }
2608
2609         if (elems.country_elem && elems.pwr_constr_elem &&
2610             mgmt->u.probe_resp.capab_info &
2611                                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
2612                 ieee80211_handle_pwr_constr(sdata, chan,
2613                                             elems.country_elem,
2614                                             elems.country_elem_len,
2615                                             elems.pwr_constr_elem);
2616
2617         ieee80211_bss_info_change_notify(sdata, changed);
2618 }
2619
2620 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2621                                   struct sk_buff *skb)
2622 {
2623         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2624         struct ieee80211_rx_status *rx_status;
2625         struct ieee80211_mgmt *mgmt;
2626         struct cfg80211_bss *bss = NULL;
2627         enum rx_mgmt_action rma = RX_MGMT_NONE;
2628         u16 fc;
2629
2630         rx_status = (struct ieee80211_rx_status *) skb->cb;
2631         mgmt = (struct ieee80211_mgmt *) skb->data;
2632         fc = le16_to_cpu(mgmt->frame_control);
2633
2634         mutex_lock(&ifmgd->mtx);
2635
2636         switch (fc & IEEE80211_FCTL_STYPE) {
2637         case IEEE80211_STYPE_BEACON:
2638                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2639                 break;
2640         case IEEE80211_STYPE_PROBE_RESP:
2641                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2642                 break;
2643         case IEEE80211_STYPE_AUTH:
2644                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2645                 break;
2646         case IEEE80211_STYPE_DEAUTH:
2647                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2648                 break;
2649         case IEEE80211_STYPE_DISASSOC:
2650                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2651                 break;
2652         case IEEE80211_STYPE_ASSOC_RESP:
2653         case IEEE80211_STYPE_REASSOC_RESP:
2654                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2655                 break;
2656         case IEEE80211_STYPE_ACTION:
2657                 switch (mgmt->u.action.category) {
2658                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2659                         ieee80211_sta_process_chanswitch(sdata,
2660                                         &mgmt->u.action.u.chan_switch.sw_elem,
2661                                         (void *)ifmgd->associated->priv,
2662                                         rx_status->mactime);
2663                         break;
2664                 }
2665         }
2666         mutex_unlock(&ifmgd->mtx);
2667
2668         switch (rma) {
2669         case RX_MGMT_NONE:
2670                 /* no action */
2671                 break;
2672         case RX_MGMT_CFG80211_DEAUTH:
2673                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2674                 break;
2675         case RX_MGMT_CFG80211_DISASSOC:
2676                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2677                 break;
2678         case RX_MGMT_CFG80211_RX_AUTH:
2679                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2680                 break;
2681         case RX_MGMT_CFG80211_RX_ASSOC:
2682                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2683                 break;
2684         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2685                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2686                 break;
2687         default:
2688                 WARN(1, "unexpected: %d", rma);
2689         }
2690 }
2691
2692 static void ieee80211_sta_timer(unsigned long data)
2693 {
2694         struct ieee80211_sub_if_data *sdata =
2695                 (struct ieee80211_sub_if_data *) data;
2696         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2697         struct ieee80211_local *local = sdata->local;
2698
2699         if (local->quiescing) {
2700                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2701                 return;
2702         }
2703
2704         ieee80211_queue_work(&local->hw, &sdata->work);
2705 }
2706
2707 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2708                                           u8 *bssid, u8 reason)
2709 {
2710         struct ieee80211_local *local = sdata->local;
2711         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2712         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2713
2714         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2715                                false, frame_buf);
2716         mutex_unlock(&ifmgd->mtx);
2717
2718         /*
2719          * must be outside lock due to cfg80211,
2720          * but that's not a problem.
2721          */
2722         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
2723
2724         mutex_lock(&local->mtx);
2725         ieee80211_recalc_idle(local);
2726         mutex_unlock(&local->mtx);
2727
2728         mutex_lock(&ifmgd->mtx);
2729 }
2730
2731 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2732 {
2733         struct ieee80211_local *local = sdata->local;
2734         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2735         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2736
2737         lockdep_assert_held(&ifmgd->mtx);
2738
2739         if (WARN_ON_ONCE(!auth_data))
2740                 return -EINVAL;
2741
2742         auth_data->tries++;
2743
2744         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2745                 sdata_info(sdata, "authentication with %pM timed out\n",
2746                            auth_data->bss->bssid);
2747
2748                 /*
2749                  * Most likely AP is not in the range so remove the
2750                  * bss struct for that AP.
2751                  */
2752                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2753
2754                 return -ETIMEDOUT;
2755         }
2756
2757         drv_mgd_prepare_tx(local, sdata);
2758
2759         if (auth_data->bss->proberesp_ies) {
2760                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2761                            auth_data->bss->bssid, auth_data->tries,
2762                            IEEE80211_AUTH_MAX_TRIES);
2763
2764                 auth_data->expected_transaction = 2;
2765                 ieee80211_send_auth(sdata, 1, auth_data->algorithm, 0,
2766                                     auth_data->ie, auth_data->ie_len,
2767                                     auth_data->bss->bssid,
2768                                     auth_data->bss->bssid, NULL, 0, 0);
2769         } else {
2770                 const u8 *ssidie;
2771
2772                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2773                            auth_data->bss->bssid, auth_data->tries,
2774                            IEEE80211_AUTH_MAX_TRIES);
2775
2776                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2777                 if (!ssidie)
2778                         return -EINVAL;
2779                 /*
2780                  * Direct probe is sent to broadcast address as some APs
2781                  * will not answer to direct packet in unassociated state.
2782                  */
2783                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2784                                          NULL, 0, (u32) -1, true, false,
2785                                          auth_data->bss->channel, false);
2786         }
2787
2788         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2789         run_again(ifmgd, auth_data->timeout);
2790
2791         return 0;
2792 }
2793
2794 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2795 {
2796         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2797         struct ieee80211_local *local = sdata->local;
2798
2799         lockdep_assert_held(&sdata->u.mgd.mtx);
2800
2801         assoc_data->tries++;
2802         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2803                 sdata_info(sdata, "association with %pM timed out\n",
2804                            assoc_data->bss->bssid);
2805
2806                 /*
2807                  * Most likely AP is not in the range so remove the
2808                  * bss struct for that AP.
2809                  */
2810                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2811
2812                 return -ETIMEDOUT;
2813         }
2814
2815         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2816                    assoc_data->bss->bssid, assoc_data->tries,
2817                    IEEE80211_ASSOC_MAX_TRIES);
2818         ieee80211_send_assoc(sdata);
2819
2820         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2821         run_again(&sdata->u.mgd, assoc_data->timeout);
2822
2823         return 0;
2824 }
2825
2826 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2827 {
2828         struct ieee80211_local *local = sdata->local;
2829         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2830
2831         mutex_lock(&ifmgd->mtx);
2832
2833         if (ifmgd->auth_data &&
2834             time_after(jiffies, ifmgd->auth_data->timeout)) {
2835                 if (ifmgd->auth_data->done) {
2836                         /*
2837                          * ok ... we waited for assoc but userspace didn't,
2838                          * so let's just kill the auth data
2839                          */
2840                         ieee80211_destroy_auth_data(sdata, false);
2841                 } else if (ieee80211_probe_auth(sdata)) {
2842                         u8 bssid[ETH_ALEN];
2843
2844                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2845
2846                         ieee80211_destroy_auth_data(sdata, false);
2847
2848                         mutex_unlock(&ifmgd->mtx);
2849                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2850                         mutex_lock(&ifmgd->mtx);
2851                 }
2852         } else if (ifmgd->auth_data)
2853                 run_again(ifmgd, ifmgd->auth_data->timeout);
2854
2855         if (ifmgd->assoc_data &&
2856             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2857                 if (!ifmgd->assoc_data->have_beacon ||
2858                     ieee80211_do_assoc(sdata)) {
2859                         u8 bssid[ETH_ALEN];
2860
2861                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2862
2863                         ieee80211_destroy_assoc_data(sdata, false);
2864
2865                         mutex_unlock(&ifmgd->mtx);
2866                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2867                         mutex_lock(&ifmgd->mtx);
2868                 }
2869         } else if (ifmgd->assoc_data)
2870                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2871
2872         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2873                             IEEE80211_STA_CONNECTION_POLL) &&
2874             ifmgd->associated) {
2875                 u8 bssid[ETH_ALEN];
2876                 int max_tries;
2877
2878                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2879
2880                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2881                         max_tries = max_nullfunc_tries;
2882                 else
2883                         max_tries = max_probe_tries;
2884
2885                 /* ACK received for nullfunc probing frame */
2886                 if (!ifmgd->probe_send_count)
2887                         ieee80211_reset_ap_probe(sdata);
2888                 else if (ifmgd->nullfunc_failed) {
2889                         if (ifmgd->probe_send_count < max_tries) {
2890                                 mlme_dbg(sdata,
2891                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
2892                                          bssid, ifmgd->probe_send_count,
2893                                          max_tries);
2894                                 ieee80211_mgd_probe_ap_send(sdata);
2895                         } else {
2896                                 mlme_dbg(sdata,
2897                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
2898                                          bssid);
2899                                 ieee80211_sta_connection_lost(sdata, bssid,
2900                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2901                         }
2902                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2903                         run_again(ifmgd, ifmgd->probe_timeout);
2904                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2905                         mlme_dbg(sdata,
2906                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
2907                                  bssid, probe_wait_ms);
2908                         ieee80211_sta_connection_lost(sdata, bssid,
2909                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2910                 } else if (ifmgd->probe_send_count < max_tries) {
2911                         mlme_dbg(sdata,
2912                                  "No probe response from AP %pM after %dms, try %d/%i\n",
2913                                  bssid, probe_wait_ms,
2914                                  ifmgd->probe_send_count, max_tries);
2915                         ieee80211_mgd_probe_ap_send(sdata);
2916                 } else {
2917                         /*
2918                          * We actually lost the connection ... or did we?
2919                          * Let's make sure!
2920                          */
2921                         wiphy_debug(local->hw.wiphy,
2922                                     "%s: No probe response from AP %pM"
2923                                     " after %dms, disconnecting.\n",
2924                                     sdata->name,
2925                                     bssid, probe_wait_ms);
2926
2927                         ieee80211_sta_connection_lost(sdata, bssid,
2928                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2929                 }
2930         }
2931
2932         mutex_unlock(&ifmgd->mtx);
2933
2934         mutex_lock(&local->mtx);
2935         ieee80211_recalc_idle(local);
2936         mutex_unlock(&local->mtx);
2937 }
2938
2939 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2940 {
2941         struct ieee80211_sub_if_data *sdata =
2942                 (struct ieee80211_sub_if_data *) data;
2943         struct ieee80211_local *local = sdata->local;
2944
2945         if (local->quiescing)
2946                 return;
2947
2948         ieee80211_queue_work(&sdata->local->hw,
2949                              &sdata->u.mgd.beacon_connection_loss_work);
2950 }
2951
2952 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2953 {
2954         struct ieee80211_sub_if_data *sdata =
2955                 (struct ieee80211_sub_if_data *) data;
2956         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2957         struct ieee80211_local *local = sdata->local;
2958
2959         if (local->quiescing)
2960                 return;
2961
2962         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2963 }
2964
2965 static void ieee80211_sta_monitor_work(struct work_struct *work)
2966 {
2967         struct ieee80211_sub_if_data *sdata =
2968                 container_of(work, struct ieee80211_sub_if_data,
2969                              u.mgd.monitor_work);
2970
2971         ieee80211_mgd_probe_ap(sdata, false);
2972 }
2973
2974 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2975 {
2976         u32 flags;
2977
2978         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2979                 __ieee80211_stop_poll(sdata);
2980
2981                 /* let's probe the connection once */
2982                 flags = sdata->local->hw.flags;
2983                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2984                         ieee80211_queue_work(&sdata->local->hw,
2985                                              &sdata->u.mgd.monitor_work);
2986                 /* and do all the other regular work too */
2987                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2988         }
2989 }
2990
2991 #ifdef CONFIG_PM
2992 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2993 {
2994         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2995
2996         /*
2997          * we need to use atomic bitops for the running bits
2998          * only because both timers might fire at the same
2999          * time -- the code here is properly synchronised.
3000          */
3001
3002         cancel_work_sync(&ifmgd->request_smps_work);
3003
3004         cancel_work_sync(&ifmgd->monitor_work);
3005         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
3006         cancel_work_sync(&ifmgd->csa_connection_drop_work);
3007         if (del_timer_sync(&ifmgd->timer))
3008                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
3009
3010         cancel_work_sync(&ifmgd->chswitch_work);
3011         if (del_timer_sync(&ifmgd->chswitch_timer))
3012                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
3013
3014         /* these will just be re-established on connection */
3015         del_timer_sync(&ifmgd->conn_mon_timer);
3016         del_timer_sync(&ifmgd->bcn_mon_timer);
3017 }
3018
3019 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3020 {
3021         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3022
3023         if (!ifmgd->associated)
3024                 return;
3025
3026         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3027                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3028                 mutex_lock(&ifmgd->mtx);
3029                 if (ifmgd->associated) {
3030                         mlme_dbg(sdata,
3031                                  "driver requested disconnect after resume\n");
3032                         ieee80211_sta_connection_lost(sdata,
3033                                 ifmgd->associated->bssid,
3034                                 WLAN_REASON_UNSPECIFIED);
3035                         mutex_unlock(&ifmgd->mtx);
3036                         return;
3037                 }
3038                 mutex_unlock(&ifmgd->mtx);
3039         }
3040
3041         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
3042                 add_timer(&ifmgd->timer);
3043         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
3044                 add_timer(&ifmgd->chswitch_timer);
3045         ieee80211_sta_reset_beacon_monitor(sdata);
3046
3047         mutex_lock(&sdata->local->mtx);
3048         ieee80211_restart_sta_timer(sdata);
3049         mutex_unlock(&sdata->local->mtx);
3050 }
3051 #endif
3052
3053 /* interface setup */
3054 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3055 {
3056         struct ieee80211_if_managed *ifmgd;
3057
3058         ifmgd = &sdata->u.mgd;
3059         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3060         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3061         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3062                   ieee80211_beacon_connection_loss_work);
3063         INIT_WORK(&ifmgd->csa_connection_drop_work,
3064                   ieee80211_csa_connection_drop_work);
3065         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3066         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3067                     (unsigned long) sdata);
3068         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3069                     (unsigned long) sdata);
3070         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3071                     (unsigned long) sdata);
3072         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3073                     (unsigned long) sdata);
3074
3075         ifmgd->flags = 0;
3076         ifmgd->powersave = sdata->wdev.ps;
3077         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
3078         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
3079
3080         mutex_init(&ifmgd->mtx);
3081
3082         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3083                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3084         else
3085                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3086 }
3087
3088 /* scan finished notification */
3089 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3090 {
3091         struct ieee80211_sub_if_data *sdata;
3092
3093         /* Restart STA timers */
3094         rcu_read_lock();
3095         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3096                 ieee80211_restart_sta_timer(sdata);
3097         rcu_read_unlock();
3098 }
3099
3100 int ieee80211_max_network_latency(struct notifier_block *nb,
3101                                   unsigned long data, void *dummy)
3102 {
3103         s32 latency_usec = (s32) data;
3104         struct ieee80211_local *local =
3105                 container_of(nb, struct ieee80211_local,
3106                              network_latency_notifier);
3107
3108         mutex_lock(&local->iflist_mtx);
3109         ieee80211_recalc_ps(local, latency_usec);
3110         mutex_unlock(&local->iflist_mtx);
3111
3112         return 0;
3113 }
3114
3115 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3116                                   struct cfg80211_bss *cbss)
3117 {
3118         struct ieee80211_local *local = sdata->local;
3119         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3120         int ht_cfreq;
3121         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3122         const u8 *ht_oper_ie;
3123         const struct ieee80211_ht_operation *ht_oper = NULL;
3124         struct ieee80211_supported_band *sband;
3125
3126         sband = local->hw.wiphy->bands[cbss->channel->band];
3127
3128         ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3129
3130         if (sband->ht_cap.ht_supported) {
3131                 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3132                                               cbss->information_elements,
3133                                               cbss->len_information_elements);
3134                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3135                         ht_oper = (void *)(ht_oper_ie + 2);
3136         }
3137
3138         if (ht_oper) {
3139                 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3140                                                           cbss->channel->band);
3141                 /* check that channel matches the right operating channel */
3142                 if (cbss->channel->center_freq != ht_cfreq) {
3143                         /*
3144                          * It's possible that some APs are confused here;
3145                          * Netgear WNDR3700 sometimes reports 4 higher than
3146                          * the actual channel in association responses, but
3147                          * since we look at probe response/beacon data here
3148                          * it should be OK.
3149                          */
3150                         sdata_info(sdata,
3151                                    "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3152                                    cbss->channel->center_freq,
3153                                    ht_cfreq, ht_oper->primary_chan,
3154                                    cbss->channel->band);
3155                         ht_oper = NULL;
3156                 }
3157         }
3158
3159         if (ht_oper) {
3160                 const u8 *ht_cap_ie;
3161                 const struct ieee80211_ht_cap *ht_cap;
3162                 u8 chains = 1;
3163
3164                 channel_type = NL80211_CHAN_HT20;
3165
3166                 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3167                         switch (ht_oper->ht_param &
3168                                         IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3169                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3170                                 channel_type = NL80211_CHAN_HT40PLUS;
3171                                 break;
3172                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3173                                 channel_type = NL80211_CHAN_HT40MINUS;
3174                                 break;
3175                         }
3176                 }
3177
3178                 ht_cap_ie = cfg80211_find_ie(WLAN_EID_HT_CAPABILITY,
3179                                              cbss->information_elements,
3180                                              cbss->len_information_elements);
3181                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3182                         ht_cap = (void *)(ht_cap_ie + 2);
3183                         chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3184                 }
3185                 sdata->needed_rx_chains = min(chains, local->rx_chains);
3186         } else {
3187                 sdata->needed_rx_chains = 1;
3188         }
3189
3190         /* will change later if needed */
3191         sdata->smps_mode = IEEE80211_SMPS_OFF;
3192
3193         ieee80211_vif_release_channel(sdata);
3194         return ieee80211_vif_use_channel(sdata, cbss->channel, channel_type,
3195                                          IEEE80211_CHANCTX_SHARED);
3196 }
3197
3198 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3199                                      struct cfg80211_bss *cbss, bool assoc)
3200 {
3201         struct ieee80211_local *local = sdata->local;
3202         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3203         struct ieee80211_bss *bss = (void *)cbss->priv;
3204         struct sta_info *new_sta = NULL;
3205         bool have_sta = false;
3206         int err;
3207
3208         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3209                 return -EINVAL;
3210
3211         if (assoc) {
3212                 rcu_read_lock();
3213                 have_sta = sta_info_get(sdata, cbss->bssid);
3214                 rcu_read_unlock();
3215         }
3216
3217         if (!have_sta) {
3218                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3219                 if (!new_sta)
3220                         return -ENOMEM;
3221         }
3222
3223         mutex_lock(&local->mtx);
3224         ieee80211_recalc_idle(sdata->local);
3225         mutex_unlock(&local->mtx);
3226
3227         if (new_sta) {
3228                 u32 rates = 0, basic_rates = 0;
3229                 bool have_higher_than_11mbit;
3230                 int min_rate = INT_MAX, min_rate_index = -1;
3231                 struct ieee80211_supported_band *sband;
3232
3233                 sband = local->hw.wiphy->bands[cbss->channel->band];
3234
3235                 err = ieee80211_prep_channel(sdata, cbss);
3236                 if (err) {
3237                         sta_info_free(local, new_sta);
3238                         return err;
3239                 }
3240
3241                 ieee80211_get_rates(sband, bss->supp_rates,
3242                                     bss->supp_rates_len,
3243                                     &rates, &basic_rates,
3244                                     &have_higher_than_11mbit,
3245                                     &min_rate, &min_rate_index);
3246
3247                 /*
3248                  * This used to be a workaround for basic rates missing
3249                  * in the association response frame. Now that we no
3250                  * longer use the basic rates from there, it probably
3251                  * doesn't happen any more, but keep the workaround so
3252                  * in case some *other* APs are buggy in different ways
3253                  * we can connect -- with a warning.
3254                  */
3255                 if (!basic_rates && min_rate_index >= 0) {
3256                         sdata_info(sdata,
3257                                    "No basic rates, using min rate instead\n");
3258                         basic_rates = BIT(min_rate_index);
3259                 }
3260
3261                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3262                 sdata->vif.bss_conf.basic_rates = basic_rates;
3263
3264                 /* cf. IEEE 802.11 9.2.12 */
3265                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3266                     have_higher_than_11mbit)
3267                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3268                 else
3269                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3270
3271                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3272
3273                 /* set timing information */
3274                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3275                 sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3276                 sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3277
3278                 /* tell driver about BSSID, basic rates and timing */
3279                 ieee80211_bss_info_change_notify(sdata,
3280                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3281                         BSS_CHANGED_BEACON_INT);
3282
3283                 if (assoc)
3284                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3285
3286                 err = sta_info_insert(new_sta);
3287                 new_sta = NULL;
3288                 if (err) {
3289                         sdata_info(sdata,
3290                                    "failed to insert STA entry for the AP (error %d)\n",
3291                                    err);
3292                         return err;
3293                 }
3294         } else
3295                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3296
3297         return 0;
3298 }
3299
3300 /* config hooks */
3301 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3302                        struct cfg80211_auth_request *req)
3303 {
3304         struct ieee80211_local *local = sdata->local;
3305         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3306         struct ieee80211_mgd_auth_data *auth_data;
3307         u16 auth_alg;
3308         int err;
3309
3310         /* prepare auth data structure */
3311
3312         switch (req->auth_type) {
3313         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3314                 auth_alg = WLAN_AUTH_OPEN;
3315                 break;
3316         case NL80211_AUTHTYPE_SHARED_KEY:
3317                 if (IS_ERR(local->wep_tx_tfm))
3318                         return -EOPNOTSUPP;
3319                 auth_alg = WLAN_AUTH_SHARED_KEY;
3320                 break;
3321         case NL80211_AUTHTYPE_FT:
3322                 auth_alg = WLAN_AUTH_FT;
3323                 break;
3324         case NL80211_AUTHTYPE_NETWORK_EAP:
3325                 auth_alg = WLAN_AUTH_LEAP;
3326                 break;
3327         default:
3328                 return -EOPNOTSUPP;
3329         }
3330
3331         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3332         if (!auth_data)
3333                 return -ENOMEM;
3334
3335         auth_data->bss = req->bss;
3336
3337         if (req->ie && req->ie_len) {
3338                 memcpy(auth_data->ie, req->ie, req->ie_len);
3339                 auth_data->ie_len = req->ie_len;
3340         }
3341
3342         if (req->key && req->key_len) {
3343                 auth_data->key_len = req->key_len;
3344                 auth_data->key_idx = req->key_idx;
3345                 memcpy(auth_data->key, req->key, req->key_len);
3346         }
3347
3348         auth_data->algorithm = auth_alg;
3349
3350         /* try to authenticate/probe */
3351
3352         mutex_lock(&ifmgd->mtx);
3353
3354         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3355             ifmgd->assoc_data) {
3356                 err = -EBUSY;
3357                 goto err_free;
3358         }
3359
3360         if (ifmgd->auth_data)
3361                 ieee80211_destroy_auth_data(sdata, false);
3362
3363         /* prep auth_data so we don't go into idle on disassoc */
3364         ifmgd->auth_data = auth_data;
3365
3366         if (ifmgd->associated)
3367                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3368
3369         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3370
3371         err = ieee80211_prep_connection(sdata, req->bss, false);
3372         if (err)
3373                 goto err_clear;
3374
3375         err = ieee80211_probe_auth(sdata);
3376         if (err) {
3377                 sta_info_destroy_addr(sdata, req->bss->bssid);
3378                 goto err_clear;
3379         }
3380
3381         /* hold our own reference */
3382         cfg80211_ref_bss(auth_data->bss);
3383         err = 0;
3384         goto out_unlock;
3385
3386  err_clear:
3387         memset(ifmgd->bssid, 0, ETH_ALEN);
3388         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3389         ifmgd->auth_data = NULL;
3390  err_free:
3391         kfree(auth_data);
3392  out_unlock:
3393         mutex_unlock(&ifmgd->mtx);
3394
3395         return err;
3396 }
3397
3398 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3399                         struct cfg80211_assoc_request *req)
3400 {
3401         struct ieee80211_local *local = sdata->local;
3402         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3403         struct ieee80211_bss *bss = (void *)req->bss->priv;
3404         struct ieee80211_mgd_assoc_data *assoc_data;
3405         struct ieee80211_supported_band *sband;
3406         const u8 *ssidie, *ht_ie;
3407         int i, err;
3408
3409         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3410         if (!ssidie)
3411                 return -EINVAL;
3412
3413         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3414         if (!assoc_data)
3415                 return -ENOMEM;
3416
3417         mutex_lock(&ifmgd->mtx);
3418
3419         if (ifmgd->associated)
3420                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3421
3422         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3423                 err = -EBUSY;
3424                 goto err_free;
3425         }
3426
3427         if (ifmgd->assoc_data) {
3428                 err = -EBUSY;
3429                 goto err_free;
3430         }
3431
3432         if (ifmgd->auth_data) {
3433                 bool match;
3434
3435                 /* keep sta info, bssid if matching */
3436                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3437                 ieee80211_destroy_auth_data(sdata, match);
3438         }
3439
3440         /* prepare assoc data */
3441
3442         /*
3443          * keep only the 40 MHz disable bit set as it might have
3444          * been set during authentication already, all other bits
3445          * should be reset for a new connection
3446          */
3447         ifmgd->flags &= IEEE80211_STA_DISABLE_40MHZ;
3448
3449         ifmgd->beacon_crc_valid = false;
3450
3451         /*
3452          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3453          * We still associate in non-HT mode (11a/b/g) if any one of these
3454          * ciphers is configured as pairwise.
3455          * We can set this to true for non-11n hardware, that'll be checked
3456          * separately along with the peer capabilities.
3457          */
3458         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3459                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3460                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3461                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3462                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3463                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3464                         netdev_info(sdata->dev,
3465                                     "disabling HT/VHT due to WEP/TKIP use\n");
3466                 }
3467         }
3468
3469         if (req->flags & ASSOC_REQ_DISABLE_HT) {
3470                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3471                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3472         }
3473
3474         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3475         sband = local->hw.wiphy->bands[req->bss->channel->band];
3476         if (!sband->ht_cap.ht_supported ||
3477             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3478                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3479                 if (!bss->wmm_used)
3480                         netdev_info(sdata->dev,
3481                                     "disabling HT as WMM/QoS is not supported by the AP\n");
3482         }
3483
3484         /* disable VHT if we don't support it or the AP doesn't use WMM */
3485         if (!sband->vht_cap.vht_supported ||
3486             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3487                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3488                 if (!bss->wmm_used)
3489                         netdev_info(sdata->dev,
3490                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
3491         }
3492
3493         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3494         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3495                sizeof(ifmgd->ht_capa_mask));
3496
3497         if (req->ie && req->ie_len) {
3498                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3499                 assoc_data->ie_len = req->ie_len;
3500         }
3501
3502         assoc_data->bss = req->bss;
3503
3504         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3505                 if (ifmgd->powersave)
3506                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
3507                 else
3508                         sdata->smps_mode = IEEE80211_SMPS_OFF;
3509         } else
3510                 sdata->smps_mode = ifmgd->req_smps;
3511
3512         assoc_data->capability = req->bss->capability;
3513         assoc_data->wmm = bss->wmm_used &&
3514                           (local->hw.queues >= IEEE80211_NUM_ACS);
3515         assoc_data->supp_rates = bss->supp_rates;
3516         assoc_data->supp_rates_len = bss->supp_rates_len;
3517
3518         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3519         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3520                 assoc_data->ap_ht_param =
3521                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3522         else
3523                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3524
3525         if (bss->wmm_used && bss->uapsd_supported &&
3526             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3527                 assoc_data->uapsd = true;
3528                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3529         } else {
3530                 assoc_data->uapsd = false;
3531                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3532         }
3533
3534         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3535         assoc_data->ssid_len = ssidie[1];
3536
3537         if (req->prev_bssid)
3538                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3539
3540         if (req->use_mfp) {
3541                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3542                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3543         } else {
3544                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3545                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3546         }
3547
3548         if (req->crypto.control_port)
3549                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3550         else
3551                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3552
3553         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3554         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3555
3556         /* kick off associate process */
3557
3558         ifmgd->assoc_data = assoc_data;
3559
3560         err = ieee80211_prep_connection(sdata, req->bss, true);
3561         if (err)
3562                 goto err_clear;
3563
3564         if (!bss->dtim_period &&
3565             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3566                 /*
3567                  * Wait up to one beacon interval ...
3568                  * should this be more if we miss one?
3569                  */
3570                 sdata_info(sdata, "waiting for beacon from %pM\n",
3571                            ifmgd->bssid);
3572                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3573         } else {
3574                 assoc_data->have_beacon = true;
3575                 assoc_data->sent_assoc = false;
3576                 assoc_data->timeout = jiffies;
3577         }
3578         run_again(ifmgd, assoc_data->timeout);
3579
3580         if (bss->corrupt_data) {
3581                 char *corrupt_type = "data";
3582                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3583                         if (bss->corrupt_data &
3584                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3585                                 corrupt_type = "beacon and probe response";
3586                         else
3587                                 corrupt_type = "beacon";
3588                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3589                         corrupt_type = "probe response";
3590                 sdata_info(sdata, "associating with AP with corrupt %s\n",
3591                            corrupt_type);
3592         }
3593
3594         err = 0;
3595         goto out;
3596  err_clear:
3597         memset(ifmgd->bssid, 0, ETH_ALEN);
3598         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3599         ifmgd->assoc_data = NULL;
3600  err_free:
3601         kfree(assoc_data);
3602  out:
3603         mutex_unlock(&ifmgd->mtx);
3604
3605         return err;
3606 }
3607
3608 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3609                          struct cfg80211_deauth_request *req)
3610 {
3611         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3612         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3613
3614         mutex_lock(&ifmgd->mtx);
3615
3616         if (ifmgd->auth_data) {
3617                 ieee80211_destroy_auth_data(sdata, false);
3618                 mutex_unlock(&ifmgd->mtx);
3619                 return 0;
3620         }
3621
3622         sdata_info(sdata,
3623                    "deauthenticating from %pM by local choice (reason=%d)\n",
3624                    req->bssid, req->reason_code);
3625
3626         if (ifmgd->associated &&
3627             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
3628                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3629                                        req->reason_code, true, frame_buf);
3630         } else {
3631                 drv_mgd_prepare_tx(sdata->local, sdata);
3632                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3633                                                IEEE80211_STYPE_DEAUTH,
3634                                                req->reason_code, true,
3635                                                frame_buf);
3636         }
3637
3638         mutex_unlock(&ifmgd->mtx);
3639
3640         __cfg80211_send_deauth(sdata->dev, frame_buf,
3641                                IEEE80211_DEAUTH_FRAME_LEN);
3642
3643         mutex_lock(&sdata->local->mtx);
3644         ieee80211_recalc_idle(sdata->local);
3645         mutex_unlock(&sdata->local->mtx);
3646
3647         return 0;
3648 }
3649
3650 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3651                            struct cfg80211_disassoc_request *req)
3652 {
3653         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3654         u8 bssid[ETH_ALEN];
3655         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3656
3657         mutex_lock(&ifmgd->mtx);
3658
3659         /*
3660          * cfg80211 should catch this ... but it's racy since
3661          * we can receive a disassoc frame, process it, hand it
3662          * to cfg80211 while that's in a locked section already
3663          * trying to tell us that the user wants to disconnect.
3664          */
3665         if (ifmgd->associated != req->bss) {
3666                 mutex_unlock(&ifmgd->mtx);
3667                 return -ENOLINK;
3668         }
3669
3670         sdata_info(sdata,
3671                    "disassociating from %pM by local choice (reason=%d)\n",
3672                    req->bss->bssid, req->reason_code);
3673
3674         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3675         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3676                                req->reason_code, !req->local_state_change,
3677                                frame_buf);
3678         mutex_unlock(&ifmgd->mtx);
3679
3680         __cfg80211_send_disassoc(sdata->dev, frame_buf,
3681                                  IEEE80211_DEAUTH_FRAME_LEN);
3682
3683         mutex_lock(&sdata->local->mtx);
3684         ieee80211_recalc_idle(sdata->local);
3685         mutex_unlock(&sdata->local->mtx);
3686
3687         return 0;
3688 }
3689
3690 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3691 {
3692         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3693
3694         mutex_lock(&ifmgd->mtx);
3695         if (ifmgd->assoc_data)
3696                 ieee80211_destroy_assoc_data(sdata, false);
3697         if (ifmgd->auth_data)
3698                 ieee80211_destroy_auth_data(sdata, false);
3699         del_timer_sync(&ifmgd->timer);
3700         mutex_unlock(&ifmgd->mtx);
3701 }
3702
3703 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3704                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3705                                gfp_t gfp)
3706 {
3707         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3708
3709         trace_api_cqm_rssi_notify(sdata, rssi_event);
3710
3711         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3712 }
3713 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);