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/rtnetlink.h>
  20 #include <linux/pm_qos_params.h>
  21 #include <linux/crc32.h>
  22 #include <linux/slab.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "driver-ops.h"
  28 #include "rate.h"
  29 #include "led.h"
  30
  31 #define IEEE80211_MAX_PROBE_TRIES 5
  32
  33 /*
  34  * beacon loss detection timeout
  35  * XXX: should depend on beacon interval
  36  */
  37 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
  38 /*
  39  * Time the connection can be idle before we probe
  40  * it to see if we can still talk to the AP.
  41  */
  42 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  43 /*
  44  * Time we wait for a probe response after sending
  45  * a probe request because of beacon loss or for
  46  * checking the connection still works.
  47  */
  48 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  49
  50 /*
  51  * Weight given to the latest Beacon frame when calculating average signal
  52  * strength for Beacon frames received in the current BSS. This must be
  53  * between 1 and 15.
  54  */
  55 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  56
  57 /*
  58  * How many Beacon frames need to have been used in average signal strength
  59  * before starting to indicate signal change events.
  60  */
  61 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  62
  63 #define TMR_RUNNING_TIMER       0
  64 #define TMR_RUNNING_CHANSW      1
  65
  66 /*
  67  * All cfg80211 functions have to be called outside a locked
  68  * section so that they can acquire a lock themselves... This
  69  * is much simpler than queuing up things in cfg80211, but we
  70  * do need some indirection for that here.
  71  */
  72 enum rx_mgmt_action {
  73         /* no action required */
  74         RX_MGMT_NONE,
  75
  76         /* caller must call cfg80211_send_rx_auth() */
  77         RX_MGMT_CFG80211_AUTH,
  78
  79         /* caller must call cfg80211_send_rx_assoc() */
  80         RX_MGMT_CFG80211_ASSOC,
  81
  82         /* caller must call cfg80211_send_deauth() */
  83         RX_MGMT_CFG80211_DEAUTH,
  84
  85         /* caller must call cfg80211_send_disassoc() */
  86         RX_MGMT_CFG80211_DISASSOC,
  87
  88         /* caller must tell cfg80211 about internal error */
  89         RX_MGMT_CFG80211_ASSOC_ERROR,
  90 };
  91
  92 /* utils */
  93 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  94 {
  95         lockdep_assert_held(&ifmgd->mtx);
  96 }
  97
  98 /*
  99  * We can have multiple work items (and connection probing)
 100  * scheduling this timer, but we need to take care to only
 101  * reschedule it when it should fire _earlier_ than it was
 102  * asked for before, or if it's not pending right now. This
 103  * function ensures that. Note that it then is required to
 104  * run this function for all timeouts after the first one
 105  * has happened -- the work that runs from this timer will
 106  * do that.
 107  */
 108 static void run_again(struct ieee80211_if_managed *ifmgd,
 109                              unsigned long timeout)
 110 {
 111         ASSERT_MGD_MTX(ifmgd);
 112
 113         if (!timer_pending(&ifmgd->timer) ||
 114             time_before(timeout, ifmgd->timer.expires))
 115                 mod_timer(&ifmgd->timer, timeout);
 116 }
 117
 118 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 119 {
 120         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 121                 return;
 122
 123         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 124                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 125 }
 126
 127 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 128 {
 129         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 130
 131         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 132                 return;
 133
 134         mod_timer(&sdata->u.mgd.conn_mon_timer,
 135                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 136
 137         ifmgd->probe_send_count = 0;
 138 }
 139
 140 static int ecw2cw(int ecw)
 141 {
 142         return (1 << ecw) - 1;
 143 }
 144
 145 /*
 146  * ieee80211_enable_ht should be called only after the operating band
 147  * has been determined as ht configuration depends on the hw's
 148  * HT abilities for a specific band.
 149  */
 150 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 151                                struct ieee80211_ht_info *hti,
 152                                const u8 *bssid, u16 ap_ht_cap_flags)
 153 {
 154         struct ieee80211_local *local = sdata->local;
 155         struct ieee80211_supported_band *sband;
 156         struct sta_info *sta;
 157         u32 changed = 0;
 158         u16 ht_opmode;
 159         bool enable_ht = true;
 160         enum nl80211_channel_type prev_chantype;
 161         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 162
 163         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 164
 165         prev_chantype = sdata->vif.bss_conf.channel_type;
 166
 167         /* HT is not supported */
 168         if (!sband->ht_cap.ht_supported)
 169                 enable_ht = false;
 170
 171         /* check that channel matches the right operating channel */
 172         if (local->hw.conf.channel->center_freq !=
 173             ieee80211_channel_to_frequency(hti->control_chan))
 174                 enable_ht = false;
 175
 176         if (enable_ht) {
 177                 channel_type = NL80211_CHAN_HT20;
 178
 179                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 180                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 181                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 182                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 183                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 184                                 if (!(local->hw.conf.channel->flags &
 185                                     IEEE80211_CHAN_NO_HT40PLUS))
 186                                         channel_type = NL80211_CHAN_HT40PLUS;
 187                                 break;
 188                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 189                                 if (!(local->hw.conf.channel->flags &
 190                                     IEEE80211_CHAN_NO_HT40MINUS))
 191                                         channel_type = NL80211_CHAN_HT40MINUS;
 192                                 break;
 193                         }
 194                 }
 195         }
 196
 197         if (local->tmp_channel)
 198                 local->tmp_channel_type = channel_type;
 199
 200         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 201                 /* can only fail due to HT40+/- mismatch */
 202                 channel_type = NL80211_CHAN_HT20;
 203                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 204         }
 205
 206         /* channel_type change automatically detected */
 207         ieee80211_hw_config(local, 0);
 208
 209         if (prev_chantype != channel_type) {
 210                 rcu_read_lock();
 211                 sta = sta_info_get(sdata, bssid);
 212                 if (sta)
 213                         rate_control_rate_update(local, sband, sta,
 214                                                  IEEE80211_RC_HT_CHANGED,
 215                                                  channel_type);
 216                 rcu_read_unlock();
 217         }
 218
 219         ht_opmode = le16_to_cpu(hti->operation_mode);
 220
 221         /* if bss configuration changed store the new one */
 222         if (sdata->ht_opmode_valid != enable_ht ||
 223             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 224             prev_chantype != channel_type) {
 225                 changed |= BSS_CHANGED_HT;
 226                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 227                 sdata->ht_opmode_valid = enable_ht;
 228         }
 229
 230         return changed;
 231 }
 232
 233 /* frame sending functions */
 234
 235 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 236                                            const u8 *bssid, u16 stype, u16 reason,
 237                                            void *cookie, bool send_frame)
 238 {
 239         struct ieee80211_local *local = sdata->local;
 240         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 241         struct sk_buff *skb;
 242         struct ieee80211_mgmt *mgmt;
 243
 244         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 245         if (!skb) {
 246                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 247                        "deauth/disassoc frame\n", sdata->name);
 248                 return;
 249         }
 250         skb_reserve(skb, local->hw.extra_tx_headroom);
 251
 252         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 253         memset(mgmt, 0, 24);
 254         memcpy(mgmt->da, bssid, ETH_ALEN);
 255         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 256         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 257         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 258         skb_put(skb, 2);
 259         /* u.deauth.reason_code == u.disassoc.reason_code */
 260         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 261
 262         if (stype == IEEE80211_STYPE_DEAUTH)
 263                 if (cookie)
 264                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 265                 else
 266                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 267         else
 268                 if (cookie)
 269                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 270                 else
 271                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 272         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 273                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 274
 275         if (send_frame)
 276                 ieee80211_tx_skb(sdata, skb);
 277         else
 278                 kfree_skb(skb);
 279 }
 280
 281 void ieee80211_send_pspoll(struct ieee80211_local *local,
 282                            struct ieee80211_sub_if_data *sdata)
 283 {
 284         struct ieee80211_pspoll *pspoll;
 285         struct sk_buff *skb;
 286
 287         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 288         if (!skb)
 289                 return;
 290
 291         pspoll = (struct ieee80211_pspoll *) skb->data;
 292         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 293
 294         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 295         ieee80211_tx_skb(sdata, skb);
 296 }
 297
 298 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 299                              struct ieee80211_sub_if_data *sdata,
 300                              int powersave)
 301 {
 302         struct sk_buff *skb;
 303         struct ieee80211_hdr_3addr *nullfunc;
 304
 305         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 306         if (!skb)
 307                 return;
 308
 309         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 310         if (powersave)
 311                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 312
 313         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 314         ieee80211_tx_skb(sdata, skb);
 315 }
 316
 317 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 318                                           struct ieee80211_sub_if_data *sdata)
 319 {
 320         struct sk_buff *skb;
 321         struct ieee80211_hdr *nullfunc;
 322         __le16 fc;
 323
 324         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 325                 return;
 326
 327         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 328         if (!skb) {
 329                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 330                        "nullfunc frame\n", sdata->name);
 331                 return;
 332         }
 333         skb_reserve(skb, local->hw.extra_tx_headroom);
 334
 335         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 336         memset(nullfunc, 0, 30);
 337         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 338                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 339         nullfunc->frame_control = fc;
 340         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 341         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 342         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 343         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 344
 345         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 346         ieee80211_tx_skb(sdata, skb);
 347 }
 348
 349 /* spectrum management related things */
 350 static void ieee80211_chswitch_work(struct work_struct *work)
 351 {
 352         struct ieee80211_sub_if_data *sdata =
 353                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 354         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 355
 356         if (!ieee80211_sdata_running(sdata))
 357                 return;
 358
 359         mutex_lock(&ifmgd->mtx);
 360         if (!ifmgd->associated)
 361                 goto out;
 362
 363         sdata->local->oper_channel = sdata->local->csa_channel;
 364         if (!sdata->local->ops->channel_switch) {
 365                 /* call "hw_config" only if doing sw channel switch */
 366                 ieee80211_hw_config(sdata->local,
 367                         IEEE80211_CONF_CHANGE_CHANNEL);
 368         }
 369
 370         /* XXX: shouldn't really modify cfg80211-owned data! */
 371         ifmgd->associated->channel = sdata->local->oper_channel;
 372
 373         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 374                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 375  out:
 376         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 377         mutex_unlock(&ifmgd->mtx);
 378 }
 379
 380 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 381 {
 382         struct ieee80211_sub_if_data *sdata;
 383         struct ieee80211_if_managed *ifmgd;
 384
 385         sdata = vif_to_sdata(vif);
 386         ifmgd = &sdata->u.mgd;
 387
 388         trace_api_chswitch_done(sdata, success);
 389         if (!success) {
 390                 /*
 391                  * If the channel switch was not successful, stay
 392                  * around on the old channel. We currently lack
 393                  * good handling of this situation, possibly we
 394                  * should just drop the association.
 395                  */
 396                 sdata->local->csa_channel = sdata->local->oper_channel;
 397         }
 398
 399         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 400 }
 401 EXPORT_SYMBOL(ieee80211_chswitch_done);
 402
 403 static void ieee80211_chswitch_timer(unsigned long data)
 404 {
 405         struct ieee80211_sub_if_data *sdata =
 406                 (struct ieee80211_sub_if_data *) data;
 407         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 408
 409         if (sdata->local->quiescing) {
 410                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 411                 return;
 412         }
 413
 414         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 415 }
 416
 417 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 418                                       struct ieee80211_channel_sw_ie *sw_elem,
 419                                       struct ieee80211_bss *bss,
 420                                       u64 timestamp)
 421 {
 422         struct cfg80211_bss *cbss =
 423                 container_of((void *)bss, struct cfg80211_bss, priv);
 424         struct ieee80211_channel *new_ch;
 425         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 426         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 427
 428         ASSERT_MGD_MTX(ifmgd);
 429
 430         if (!ifmgd->associated)
 431                 return;
 432
 433         if (sdata->local->scanning)
 434                 return;
 435
 436         /* Disregard subsequent beacons if we are already running a timer
 437            processing a CSA */
 438
 439         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 440                 return;
 441
 442         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 443         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 444                 return;
 445
 446         sdata->local->csa_channel = new_ch;
 447
 448         if (sdata->local->ops->channel_switch) {
 449                 /* use driver's channel switch callback */
 450                 struct ieee80211_channel_switch ch_switch;
 451                 memset(&ch_switch, 0, sizeof(ch_switch));
 452                 ch_switch.timestamp = timestamp;
 453                 if (sw_elem->mode) {
 454                         ch_switch.block_tx = true;
 455                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 456                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 457                 }
 458                 ch_switch.channel = new_ch;
 459                 ch_switch.count = sw_elem->count;
 460                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 461                 drv_channel_switch(sdata->local, &ch_switch);
 462                 return;
 463         }
 464
 465         /* channel switch handled in software */
 466         if (sw_elem->count <= 1) {
 467                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 468         } else {
 469                 if (sw_elem->mode)
 470                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 471                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 472                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 473                 mod_timer(&ifmgd->chswitch_timer,
 474                           jiffies +
 475                           msecs_to_jiffies(sw_elem->count *
 476                                            cbss->beacon_interval));
 477         }
 478 }
 479
 480 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 481                                         u16 capab_info, u8 *pwr_constr_elem,
 482                                         u8 pwr_constr_elem_len)
 483 {
 484         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 485
 486         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 487                 return;
 488
 489         /* Power constraint IE length should be 1 octet */
 490         if (pwr_constr_elem_len != 1)
 491                 return;
 492
 493         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 494             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 495                 sdata->local->power_constr_level = *pwr_constr_elem;
 496                 ieee80211_hw_config(sdata->local, 0);
 497         }
 498 }
 499
 500 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 501 {
 502         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 503         struct ieee80211_local *local = sdata->local;
 504         struct ieee80211_conf *conf = &local->hw.conf;
 505
 506         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 507                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 508                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 509
 510         local->disable_dynamic_ps = false;
 511         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 512 }
 513 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 514
 515 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 516 {
 517         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 518         struct ieee80211_local *local = sdata->local;
 519         struct ieee80211_conf *conf = &local->hw.conf;
 520
 521         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 522                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 523                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 524
 525         local->disable_dynamic_ps = true;
 526         conf->dynamic_ps_timeout = 0;
 527         del_timer_sync(&local->dynamic_ps_timer);
 528         ieee80211_queue_work(&local->hw,
 529                              &local->dynamic_ps_enable_work);
 530 }
 531 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 532
 533 /* powersave */
 534 static void ieee80211_enable_ps(struct ieee80211_local *local,
 535                                 struct ieee80211_sub_if_data *sdata)
 536 {
 537         struct ieee80211_conf *conf = &local->hw.conf;
 538
 539         /*
 540          * If we are scanning right now then the parameters will
 541          * take effect when scan finishes.
 542          */
 543         if (local->scanning)
 544                 return;
 545
 546         if (conf->dynamic_ps_timeout > 0 &&
 547             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 548                 mod_timer(&local->dynamic_ps_timer, jiffies +
 549                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 550         } else {
 551                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 552                         ieee80211_send_nullfunc(local, sdata, 1);
 553
 554                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 555                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 556                         return;
 557
 558                 conf->flags |= IEEE80211_CONF_PS;
 559                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 560         }
 561 }
 562
 563 static void ieee80211_change_ps(struct ieee80211_local *local)
 564 {
 565         struct ieee80211_conf *conf = &local->hw.conf;
 566
 567         if (local->ps_sdata) {
 568                 ieee80211_enable_ps(local, local->ps_sdata);
 569         } else if (conf->flags & IEEE80211_CONF_PS) {
 570                 conf->flags &= ~IEEE80211_CONF_PS;
 571                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 572                 del_timer_sync(&local->dynamic_ps_timer);
 573                 cancel_work_sync(&local->dynamic_ps_enable_work);
 574         }
 575 }
 576
 577 /* need to hold RTNL or interface lock */
 578 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 579 {
 580         struct ieee80211_sub_if_data *sdata, *found = NULL;
 581         int count = 0;
 582         int timeout;
 583
 584         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 585                 local->ps_sdata = NULL;
 586                 return;
 587         }
 588
 589         if (!list_empty(&local->work_list)) {
 590                 local->ps_sdata = NULL;
 591                 goto change;
 592         }
 593
 594         list_for_each_entry(sdata, &local->interfaces, list) {
 595                 if (!ieee80211_sdata_running(sdata))
 596                         continue;
 597                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 598                         continue;
 599                 found = sdata;
 600                 count++;
 601         }
 602
 603         if (count == 1 && found->u.mgd.powersave &&
 604             found->u.mgd.associated &&
 605             found->u.mgd.associated->beacon_ies &&
 606             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 607                                     IEEE80211_STA_CONNECTION_POLL))) {
 608                 struct ieee80211_conf *conf = &local->hw.conf;
 609                 s32 beaconint_us;
 610
 611                 if (latency < 0)
 612                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 613
 614                 beaconint_us = ieee80211_tu_to_usec(
 615                                         found->vif.bss_conf.beacon_int);
 616
 617                 timeout = local->dynamic_ps_forced_timeout;
 618                 if (timeout < 0) {
 619                         /*
 620                          * Go to full PSM if the user configures a very low
 621                          * latency requirement.
 622                          * The 2 second value is there for compatibility until
 623                          * the PM_QOS_NETWORK_LATENCY is configured with real
 624                          * values.
 625                          */
 626                         if (latency > 1900000000 && latency != 2000000000)
 627                                 timeout = 0;
 628                         else
 629                                 timeout = 100;
 630                 }
 631                 local->dynamic_ps_user_timeout = timeout;
 632                 if (!local->disable_dynamic_ps)
 633                         conf->dynamic_ps_timeout =
 634                                 local->dynamic_ps_user_timeout;
 635
 636                 if (beaconint_us > latency) {
 637                         local->ps_sdata = NULL;
 638                 } else {
 639                         struct ieee80211_bss *bss;
 640                         int maxslp = 1;
 641                         u8 dtimper;
 642
 643                         bss = (void *)found->u.mgd.associated->priv;
 644                         dtimper = bss->dtim_period;
 645
 646                         /* If the TIM IE is invalid, pretend the value is 1 */
 647                         if (!dtimper)
 648                                 dtimper = 1;
 649                         else if (dtimper > 1)
 650                                 maxslp = min_t(int, dtimper,
 651                                                     latency / beaconint_us);
 652
 653                         local->hw.conf.max_sleep_period = maxslp;
 654                         local->hw.conf.ps_dtim_period = dtimper;
 655                         local->ps_sdata = found;
 656                 }
 657         } else {
 658                 local->ps_sdata = NULL;
 659         }
 660
 661  change:
 662         ieee80211_change_ps(local);
 663 }
 664
 665 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 666 {
 667         struct ieee80211_local *local =
 668                 container_of(work, struct ieee80211_local,
 669                              dynamic_ps_disable_work);
 670
 671         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 672                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 673                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 674         }
 675
 676         ieee80211_wake_queues_by_reason(&local->hw,
 677                                         IEEE80211_QUEUE_STOP_REASON_PS);
 678 }
 679
 680 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 681 {
 682         struct ieee80211_local *local =
 683                 container_of(work, struct ieee80211_local,
 684                              dynamic_ps_enable_work);
 685         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 686         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 687
 688         /* can only happen when PS was just disabled anyway */
 689         if (!sdata)
 690                 return;
 691
 692         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 693                 return;
 694
 695         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 696             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 697                 ieee80211_send_nullfunc(local, sdata, 1);
 698
 699         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 700               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 701             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 702                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 703                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 704                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 705         }
 706 }
 707
 708 void ieee80211_dynamic_ps_timer(unsigned long data)
 709 {
 710         struct ieee80211_local *local = (void *) data;
 711
 712         if (local->quiescing || local->suspended)
 713                 return;
 714
 715         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 716 }
 717
 718 /* MLME */
 719 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 720                                      struct ieee80211_sub_if_data *sdata,
 721                                      u8 *wmm_param, size_t wmm_param_len)
 722 {
 723         struct ieee80211_tx_queue_params params;
 724         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 725         size_t left;
 726         int count;
 727         u8 *pos, uapsd_queues = 0;
 728
 729         if (!local->ops->conf_tx)
 730                 return;
 731
 732         if (local->hw.queues < 4)
 733                 return;
 734
 735         if (!wmm_param)
 736                 return;
 737
 738         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 739                 return;
 740
 741         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 742                 uapsd_queues = local->uapsd_queues;
 743
 744         count = wmm_param[6] & 0x0f;
 745         if (count == ifmgd->wmm_last_param_set)
 746                 return;
 747         ifmgd->wmm_last_param_set = count;
 748
 749         pos = wmm_param + 8;
 750         left = wmm_param_len - 8;
 751
 752         memset(&params, 0, sizeof(params));
 753
 754         local->wmm_acm = 0;
 755         for (; left >= 4; left -= 4, pos += 4) {
 756                 int aci = (pos[0] >> 5) & 0x03;
 757                 int acm = (pos[0] >> 4) & 0x01;
 758                 bool uapsd = false;
 759                 int queue;
 760
 761                 switch (aci) {
 762                 case 1: /* AC_BK */
 763                         queue = 3;
 764                         if (acm)
 765                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 766                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 767                                 uapsd = true;
 768                         break;
 769                 case 2: /* AC_VI */
 770                         queue = 1;
 771                         if (acm)
 772                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 773                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 774                                 uapsd = true;
 775                         break;
 776                 case 3: /* AC_VO */
 777                         queue = 0;
 778                         if (acm)
 779                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 780                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 781                                 uapsd = true;
 782                         break;
 783                 case 0: /* AC_BE */
 784                 default:
 785                         queue = 2;
 786                         if (acm)
 787                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 788                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 789                                 uapsd = true;
 790                         break;
 791                 }
 792
 793                 params.aifs = pos[0] & 0x0f;
 794                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 795                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 796                 params.txop = get_unaligned_le16(pos + 2);
 797                 params.uapsd = uapsd;
 798
 799 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 800                 wiphy_debug(local->hw.wiphy,
 801                             "WMM queue=%d aci=%d acm=%d aifs=%d "
 802                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 803                             queue, aci, acm,
 804                             params.aifs, params.cw_min, params.cw_max,
 805                             params.txop, params.uapsd);
 806 #endif
 807                 if (drv_conf_tx(local, queue, &params))
 808                         wiphy_debug(local->hw.wiphy,
 809                                     "failed to set TX queue parameters for queue %d\n",
 810                                     queue);
 811         }
 812
 813         /* enable WMM or activate new settings */
 814         sdata->vif.bss_conf.qos = true;
 815         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 816 }
 817
 818 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 819                                            u16 capab, bool erp_valid, u8 erp)
 820 {
 821         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 822         u32 changed = 0;
 823         bool use_protection;
 824         bool use_short_preamble;
 825         bool use_short_slot;
 826
 827         if (erp_valid) {
 828                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 829                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 830         } else {
 831                 use_protection = false;
 832                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 833         }
 834
 835         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 836         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 837                 use_short_slot = true;
 838
 839         if (use_protection != bss_conf->use_cts_prot) {
 840                 bss_conf->use_cts_prot = use_protection;
 841                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 842         }
 843
 844         if (use_short_preamble != bss_conf->use_short_preamble) {
 845                 bss_conf->use_short_preamble = use_short_preamble;
 846                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 847         }
 848
 849         if (use_short_slot != bss_conf->use_short_slot) {
 850                 bss_conf->use_short_slot = use_short_slot;
 851                 changed |= BSS_CHANGED_ERP_SLOT;
 852         }
 853
 854         return changed;
 855 }
 856
 857 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 858                                      struct cfg80211_bss *cbss,
 859                                      u32 bss_info_changed)
 860 {
 861         struct ieee80211_bss *bss = (void *)cbss->priv;
 862         struct ieee80211_local *local = sdata->local;
 863         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 864
 865         bss_info_changed |= BSS_CHANGED_ASSOC;
 866         /* set timing information */
 867         bss_conf->beacon_int = cbss->beacon_interval;
 868         bss_conf->timestamp = cbss->tsf;
 869
 870         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 871         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 872                 cbss->capability, bss->has_erp_value, bss->erp_value);
 873
 874         sdata->u.mgd.associated = cbss;
 875         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 876
 877         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 878
 879         /* just to be sure */
 880         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 881                                 IEEE80211_STA_BEACON_POLL);
 882
 883         ieee80211_led_assoc(local, 1);
 884
 885         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
 886                 bss_conf->dtim_period = bss->dtim_period;
 887         else
 888                 bss_conf->dtim_period = 0;
 889
 890         bss_conf->assoc = 1;
 891         /*
 892          * For now just always ask the driver to update the basic rateset
 893          * when we have associated, we aren't checking whether it actually
 894          * changed or not.
 895          */
 896         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 897
 898         /* And the BSSID changed - we're associated now */
 899         bss_info_changed |= BSS_CHANGED_BSSID;
 900
 901         /* Tell the driver to monitor connection quality (if supported) */
 902         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 903             bss_conf->cqm_rssi_thold)
 904                 bss_info_changed |= BSS_CHANGED_CQM;
 905
 906         /* Enable ARP filtering */
 907         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
 908                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 909                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
 910         }
 911
 912         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 913
 914         mutex_lock(&local->iflist_mtx);
 915         ieee80211_recalc_ps(local, -1);
 916         ieee80211_recalc_smps(local);
 917         mutex_unlock(&local->iflist_mtx);
 918
 919         netif_tx_start_all_queues(sdata->dev);
 920         netif_carrier_on(sdata->dev);
 921 }
 922
 923 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 924                                    bool remove_sta, bool tx)
 925 {
 926         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 927         struct ieee80211_local *local = sdata->local;
 928         struct sta_info *sta;
 929         u32 changed = 0, config_changed = 0;
 930         u8 bssid[ETH_ALEN];
 931
 932         ASSERT_MGD_MTX(ifmgd);
 933
 934         if (WARN_ON(!ifmgd->associated))
 935                 return;
 936
 937         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 938
 939         ifmgd->associated = NULL;
 940         memset(ifmgd->bssid, 0, ETH_ALEN);
 941
 942         /*
 943          * we need to commit the associated = NULL change because the
 944          * scan code uses that to determine whether this iface should
 945          * go to/wake up from powersave or not -- and could otherwise
 946          * wake the queues erroneously.
 947          */
 948         smp_mb();
 949
 950         /*
 951          * Thus, we can only afterwards stop the queues -- to account
 952          * for the case where another CPU is finishing a scan at this
 953          * time -- we don't want the scan code to enable queues.
 954          */
 955
 956         netif_tx_stop_all_queues(sdata->dev);
 957         netif_carrier_off(sdata->dev);
 958
 959         mutex_lock(&local->sta_mtx);
 960         sta = sta_info_get(sdata, bssid);
 961         if (sta) {
 962                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
 963                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
 964         }
 965         mutex_unlock(&local->sta_mtx);
 966
 967         changed |= ieee80211_reset_erp_info(sdata);
 968
 969         ieee80211_led_assoc(local, 0);
 970         changed |= BSS_CHANGED_ASSOC;
 971         sdata->vif.bss_conf.assoc = false;
 972
 973         ieee80211_set_wmm_default(sdata);
 974
 975         /* channel(_type) changes are handled by ieee80211_hw_config */
 976         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
 977
 978         /* on the next assoc, re-program HT parameters */
 979         sdata->ht_opmode_valid = false;
 980
 981         local->power_constr_level = 0;
 982
 983         del_timer_sync(&local->dynamic_ps_timer);
 984         cancel_work_sync(&local->dynamic_ps_enable_work);
 985
 986         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 987                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 988                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 989         }
 990
 991         ieee80211_hw_config(local, config_changed);
 992
 993         /* Disable ARP filtering */
 994         if (sdata->vif.bss_conf.arp_filter_enabled) {
 995                 sdata->vif.bss_conf.arp_filter_enabled = false;
 996                 changed |= BSS_CHANGED_ARP_FILTER;
 997         }
 998
 999         /* The BSSID (not really interesting) and HT changed */
1000         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1001         ieee80211_bss_info_change_notify(sdata, changed);
1002
1003         if (remove_sta)
1004                 sta_info_destroy_addr(sdata, bssid);
1005
1006         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1007         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1008         del_timer_sync(&sdata->u.mgd.timer);
1009         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1010 }
1011
1012 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1013                              struct ieee80211_hdr *hdr)
1014 {
1015         /*
1016          * We can postpone the mgd.timer whenever receiving unicast frames
1017          * from AP because we know that the connection is working both ways
1018          * at that time. But multicast frames (and hence also beacons) must
1019          * be ignored here, because we need to trigger the timer during
1020          * data idle periods for sending the periodic probe request to the
1021          * AP we're connected to.
1022          */
1023         if (is_multicast_ether_addr(hdr->addr1))
1024                 return;
1025
1026         ieee80211_sta_reset_conn_monitor(sdata);
1027 }
1028
1029 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1030 {
1031         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1032         const u8 *ssid;
1033         u8 *dst = ifmgd->associated->bssid;
1034         u8 unicast_limit = max(1, IEEE80211_MAX_PROBE_TRIES - 3);
1035
1036         /*
1037          * Try sending broadcast probe requests for the last three
1038          * probe requests after the first ones failed since some
1039          * buggy APs only support broadcast probe requests.
1040          */
1041         if (ifmgd->probe_send_count >= unicast_limit)
1042                 dst = NULL;
1043
1044         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1045         ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0);
1046
1047         ifmgd->probe_send_count++;
1048         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1049         run_again(ifmgd, ifmgd->probe_timeout);
1050 }
1051
1052 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1053                                    bool beacon)
1054 {
1055         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1056         bool already = false;
1057
1058         if (!ieee80211_sdata_running(sdata))
1059                 return;
1060
1061         if (sdata->local->scanning)
1062                 return;
1063
1064         if (sdata->local->tmp_channel)
1065                 return;
1066
1067         mutex_lock(&ifmgd->mtx);
1068
1069         if (!ifmgd->associated)
1070                 goto out;
1071
1072 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1073         if (beacon && net_ratelimit())
1074                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1075                        "- sending probe request\n", sdata->name);
1076 #endif
1077
1078         /*
1079          * The driver/our work has already reported this event or the
1080          * connection monitoring has kicked in and we have already sent
1081          * a probe request. Or maybe the AP died and the driver keeps
1082          * reporting until we disassociate...
1083          *
1084          * In either case we have to ignore the current call to this
1085          * function (except for setting the correct probe reason bit)
1086          * because otherwise we would reset the timer every time and
1087          * never check whether we received a probe response!
1088          */
1089         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1090                             IEEE80211_STA_CONNECTION_POLL))
1091                 already = true;
1092
1093         if (beacon)
1094                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1095         else
1096                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1097
1098         if (already)
1099                 goto out;
1100
1101         mutex_lock(&sdata->local->iflist_mtx);
1102         ieee80211_recalc_ps(sdata->local, -1);
1103         mutex_unlock(&sdata->local->iflist_mtx);
1104
1105         ifmgd->probe_send_count = 0;
1106         ieee80211_mgd_probe_ap_send(sdata);
1107  out:
1108         mutex_unlock(&ifmgd->mtx);
1109 }
1110
1111 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1112                                           struct ieee80211_vif *vif)
1113 {
1114         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1115         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1116         struct sk_buff *skb;
1117         const u8 *ssid;
1118
1119         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1120                 return NULL;
1121
1122         ASSERT_MGD_MTX(ifmgd);
1123
1124         if (!ifmgd->associated)
1125                 return NULL;
1126
1127         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1128         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1129                                         ssid + 2, ssid[1], NULL, 0);
1130
1131         return skb;
1132 }
1133 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1134
1135 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1136 {
1137         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1138         struct ieee80211_local *local = sdata->local;
1139         u8 bssid[ETH_ALEN];
1140
1141         mutex_lock(&ifmgd->mtx);
1142         if (!ifmgd->associated) {
1143                 mutex_unlock(&ifmgd->mtx);
1144                 return;
1145         }
1146
1147         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1148
1149         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1150
1151         ieee80211_set_disassoc(sdata, true, true);
1152         mutex_unlock(&ifmgd->mtx);
1153
1154         mutex_lock(&local->mtx);
1155         ieee80211_recalc_idle(local);
1156         mutex_unlock(&local->mtx);
1157         /*
1158          * must be outside lock due to cfg80211,
1159          * but that's not a problem.
1160          */
1161         ieee80211_send_deauth_disassoc(sdata, bssid,
1162                                        IEEE80211_STYPE_DEAUTH,
1163                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1164                                        NULL, true);
1165 }
1166
1167 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1168 {
1169         struct ieee80211_sub_if_data *sdata =
1170                 container_of(work, struct ieee80211_sub_if_data,
1171                              u.mgd.beacon_connection_loss_work);
1172
1173         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1174                 __ieee80211_connection_loss(sdata);
1175         else
1176                 ieee80211_mgd_probe_ap(sdata, true);
1177 }
1178
1179 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1180 {
1181         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1182         struct ieee80211_hw *hw = &sdata->local->hw;
1183
1184         trace_api_beacon_loss(sdata);
1185
1186         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1187         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1188 }
1189 EXPORT_SYMBOL(ieee80211_beacon_loss);
1190
1191 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1192 {
1193         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1194         struct ieee80211_hw *hw = &sdata->local->hw;
1195
1196         trace_api_connection_loss(sdata);
1197
1198         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1199         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1200 }
1201 EXPORT_SYMBOL(ieee80211_connection_loss);
1202
1203
1204 static enum rx_mgmt_action __must_check
1205 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1206                          struct ieee80211_mgmt *mgmt, size_t len)
1207 {
1208         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1209         const u8 *bssid = NULL;
1210         u16 reason_code;
1211
1212         if (len < 24 + 2)
1213                 return RX_MGMT_NONE;
1214
1215         ASSERT_MGD_MTX(ifmgd);
1216
1217         bssid = ifmgd->associated->bssid;
1218
1219         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1220
1221         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1222                         sdata->name, bssid, reason_code);
1223
1224         ieee80211_set_disassoc(sdata, true, false);
1225         mutex_lock(&sdata->local->mtx);
1226         ieee80211_recalc_idle(sdata->local);
1227         mutex_unlock(&sdata->local->mtx);
1228
1229         return RX_MGMT_CFG80211_DEAUTH;
1230 }
1231
1232
1233 static enum rx_mgmt_action __must_check
1234 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1235                            struct ieee80211_mgmt *mgmt, size_t len)
1236 {
1237         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1238         u16 reason_code;
1239
1240         if (len < 24 + 2)
1241                 return RX_MGMT_NONE;
1242
1243         ASSERT_MGD_MTX(ifmgd);
1244
1245         if (WARN_ON(!ifmgd->associated))
1246                 return RX_MGMT_NONE;
1247
1248         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1249                 return RX_MGMT_NONE;
1250
1251         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1252
1253         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1254                         sdata->name, mgmt->sa, reason_code);
1255
1256         ieee80211_set_disassoc(sdata, true, false);
1257         mutex_lock(&sdata->local->mtx);
1258         ieee80211_recalc_idle(sdata->local);
1259         mutex_unlock(&sdata->local->mtx);
1260         return RX_MGMT_CFG80211_DISASSOC;
1261 }
1262
1263
1264 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1265                                     struct ieee80211_mgmt *mgmt, size_t len)
1266 {
1267         struct ieee80211_sub_if_data *sdata = wk->sdata;
1268         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1269         struct ieee80211_local *local = sdata->local;
1270         struct ieee80211_supported_band *sband;
1271         struct sta_info *sta;
1272         struct cfg80211_bss *cbss = wk->assoc.bss;
1273         u8 *pos;
1274         u32 rates, basic_rates;
1275         u16 capab_info, aid;
1276         struct ieee802_11_elems elems;
1277         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1278         u32 changed = 0;
1279         int i, j, err;
1280         bool have_higher_than_11mbit = false;
1281         u16 ap_ht_cap_flags;
1282
1283         /* AssocResp and ReassocResp have identical structure */
1284
1285         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1286         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1287
1288         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1289                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1290                        "set\n", sdata->name, aid);
1291         aid &= ~(BIT(15) | BIT(14));
1292
1293         pos = mgmt->u.assoc_resp.variable;
1294         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1295
1296         if (!elems.supp_rates) {
1297                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1298                        sdata->name);
1299                 return false;
1300         }
1301
1302         ifmgd->aid = aid;
1303
1304         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1305         if (!sta) {
1306                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1307                        " the AP\n", sdata->name);
1308                 return false;
1309         }
1310
1311         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1312                            WLAN_STA_ASSOC_AP);
1313         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1314                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1315
1316         rates = 0;
1317         basic_rates = 0;
1318         sband = local->hw.wiphy->bands[wk->chan->band];
1319
1320         for (i = 0; i < elems.supp_rates_len; i++) {
1321                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1322                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1323
1324                 if (rate > 110)
1325                         have_higher_than_11mbit = true;
1326
1327                 for (j = 0; j < sband->n_bitrates; j++) {
1328                         if (sband->bitrates[j].bitrate == rate) {
1329                                 rates |= BIT(j);
1330                                 if (is_basic)
1331                                         basic_rates |= BIT(j);
1332                                 break;
1333                         }
1334                 }
1335         }
1336
1337         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1338                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1339                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1340
1341                 if (rate > 110)
1342                         have_higher_than_11mbit = true;
1343
1344                 for (j = 0; j < sband->n_bitrates; j++) {
1345                         if (sband->bitrates[j].bitrate == rate) {
1346                                 rates |= BIT(j);
1347                                 if (is_basic)
1348                                         basic_rates |= BIT(j);
1349                                 break;
1350                         }
1351                 }
1352         }
1353
1354         sta->sta.supp_rates[wk->chan->band] = rates;
1355         sdata->vif.bss_conf.basic_rates = basic_rates;
1356
1357         /* cf. IEEE 802.11 9.2.12 */
1358         if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1359             have_higher_than_11mbit)
1360                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1361         else
1362                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1363
1364         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1365                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1366                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1367
1368         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1369
1370         rate_control_rate_init(sta);
1371
1372         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1373                 set_sta_flags(sta, WLAN_STA_MFP);
1374
1375         if (elems.wmm_param)
1376                 set_sta_flags(sta, WLAN_STA_WME);
1377
1378         err = sta_info_insert(sta);
1379         sta = NULL;
1380         if (err) {
1381                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1382                        " the AP (error %d)\n", sdata->name, err);
1383                 return false;
1384         }
1385
1386         /*
1387          * Always handle WMM once after association regardless
1388          * of the first value the AP uses. Setting -1 here has
1389          * that effect because the AP values is an unsigned
1390          * 4-bit value.
1391          */
1392         ifmgd->wmm_last_param_set = -1;
1393
1394         if (elems.wmm_param)
1395                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1396                                          elems.wmm_param_len);
1397         else
1398                 ieee80211_set_wmm_default(sdata);
1399
1400         local->oper_channel = wk->chan;
1401
1402         if (elems.ht_info_elem && elems.wmm_param &&
1403             (sdata->local->hw.queues >= 4) &&
1404             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1405                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1406                                                cbss->bssid, ap_ht_cap_flags);
1407
1408         /* set AID and assoc capability,
1409          * ieee80211_set_associated() will tell the driver */
1410         bss_conf->aid = aid;
1411         bss_conf->assoc_capability = capab_info;
1412         ieee80211_set_associated(sdata, cbss, changed);
1413
1414         /*
1415          * If we're using 4-addr mode, let the AP know that we're
1416          * doing so, so that it can create the STA VLAN on its side
1417          */
1418         if (ifmgd->use_4addr)
1419                 ieee80211_send_4addr_nullfunc(local, sdata);
1420
1421         /*
1422          * Start timer to probe the connection to the AP now.
1423          * Also start the timer that will detect beacon loss.
1424          */
1425         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1426         ieee80211_sta_reset_beacon_monitor(sdata);
1427
1428         return true;
1429 }
1430
1431
1432 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1433                                   struct ieee80211_mgmt *mgmt,
1434                                   size_t len,
1435                                   struct ieee80211_rx_status *rx_status,
1436                                   struct ieee802_11_elems *elems,
1437                                   bool beacon)
1438 {
1439         struct ieee80211_local *local = sdata->local;
1440         int freq;
1441         struct ieee80211_bss *bss;
1442         struct ieee80211_channel *channel;
1443         bool need_ps = false;
1444
1445         if (sdata->u.mgd.associated) {
1446                 bss = (void *)sdata->u.mgd.associated->priv;
1447                 /* not previously set so we may need to recalc */
1448                 need_ps = !bss->dtim_period;
1449         }
1450
1451         if (elems->ds_params && elems->ds_params_len == 1)
1452                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1453         else
1454                 freq = rx_status->freq;
1455
1456         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1457
1458         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1459                 return;
1460
1461         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1462                                         channel, beacon);
1463         if (bss)
1464                 ieee80211_rx_bss_put(local, bss);
1465
1466         if (!sdata->u.mgd.associated)
1467                 return;
1468
1469         if (need_ps) {
1470                 mutex_lock(&local->iflist_mtx);
1471                 ieee80211_recalc_ps(local, -1);
1472                 mutex_unlock(&local->iflist_mtx);
1473         }
1474
1475         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1476             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1477                                                         ETH_ALEN) == 0)) {
1478                 struct ieee80211_channel_sw_ie *sw_elem =
1479                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1480                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1481                                                  bss, rx_status->mactime);
1482         }
1483 }
1484
1485
1486 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1487                                          struct sk_buff *skb)
1488 {
1489         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1490         struct ieee80211_if_managed *ifmgd;
1491         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1492         size_t baselen, len = skb->len;
1493         struct ieee802_11_elems elems;
1494
1495         ifmgd = &sdata->u.mgd;
1496
1497         ASSERT_MGD_MTX(ifmgd);
1498
1499         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1500                 return; /* ignore ProbeResp to foreign address */
1501
1502         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1503         if (baselen > len)
1504                 return;
1505
1506         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1507                                 &elems);
1508
1509         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1510
1511         if (ifmgd->associated &&
1512             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1513             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1514                             IEEE80211_STA_CONNECTION_POLL)) {
1515                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1516                                   IEEE80211_STA_BEACON_POLL);
1517                 mutex_lock(&sdata->local->iflist_mtx);
1518                 ieee80211_recalc_ps(sdata->local, -1);
1519                 mutex_unlock(&sdata->local->iflist_mtx);
1520
1521                 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1522                         return;
1523
1524                 /*
1525                  * We've received a probe response, but are not sure whether
1526                  * we have or will be receiving any beacons or data, so let's
1527                  * schedule the timers again, just in case.
1528                  */
1529                 ieee80211_sta_reset_beacon_monitor(sdata);
1530
1531                 mod_timer(&ifmgd->conn_mon_timer,
1532                           round_jiffies_up(jiffies +
1533                                            IEEE80211_CONNECTION_IDLE_TIME));
1534         }
1535 }
1536
1537 /*
1538  * This is the canonical list of information elements we care about,
1539  * the filter code also gives us all changes to the Microsoft OUI
1540  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1541  *
1542  * We implement beacon filtering in software since that means we can
1543  * avoid processing the frame here and in cfg80211, and userspace
1544  * will not be able to tell whether the hardware supports it or not.
1545  *
1546  * XXX: This list needs to be dynamic -- userspace needs to be able to
1547  *      add items it requires. It also needs to be able to tell us to
1548  *      look out for other vendor IEs.
1549  */
1550 static const u64 care_about_ies =
1551         (1ULL << WLAN_EID_COUNTRY) |
1552         (1ULL << WLAN_EID_ERP_INFO) |
1553         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1554         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1555         (1ULL << WLAN_EID_HT_CAPABILITY) |
1556         (1ULL << WLAN_EID_HT_INFORMATION);
1557
1558 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1559                                      struct ieee80211_mgmt *mgmt,
1560                                      size_t len,
1561                                      struct ieee80211_rx_status *rx_status)
1562 {
1563         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1564         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1565         size_t baselen;
1566         struct ieee802_11_elems elems;
1567         struct ieee80211_local *local = sdata->local;
1568         u32 changed = 0;
1569         bool erp_valid, directed_tim = false;
1570         u8 erp_value = 0;
1571         u32 ncrc;
1572         u8 *bssid;
1573
1574         ASSERT_MGD_MTX(ifmgd);
1575
1576         /* Process beacon from the current BSS */
1577         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1578         if (baselen > len)
1579                 return;
1580
1581         if (rx_status->freq != local->hw.conf.channel->center_freq)
1582                 return;
1583
1584         /*
1585          * We might have received a number of frames, among them a
1586          * disassoc frame and a beacon...
1587          */
1588         if (!ifmgd->associated)
1589                 return;
1590
1591         bssid = ifmgd->associated->bssid;
1592
1593         /*
1594          * And in theory even frames from a different AP we were just
1595          * associated to a split-second ago!
1596          */
1597         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1598                 return;
1599
1600         /* Track average RSSI from the Beacon frames of the current AP */
1601         ifmgd->last_beacon_signal = rx_status->signal;
1602         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1603                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1604                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1605                 ifmgd->last_cqm_event_signal = 0;
1606                 ifmgd->count_beacon_signal = 1;
1607         } else {
1608                 ifmgd->ave_beacon_signal =
1609                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1610                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1611                          ifmgd->ave_beacon_signal) / 16;
1612                 ifmgd->count_beacon_signal++;
1613         }
1614         if (bss_conf->cqm_rssi_thold &&
1615             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1616             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1617                 int sig = ifmgd->ave_beacon_signal / 16;
1618                 int last_event = ifmgd->last_cqm_event_signal;
1619                 int thold = bss_conf->cqm_rssi_thold;
1620                 int hyst = bss_conf->cqm_rssi_hyst;
1621                 if (sig < thold &&
1622                     (last_event == 0 || sig < last_event - hyst)) {
1623                         ifmgd->last_cqm_event_signal = sig;
1624                         ieee80211_cqm_rssi_notify(
1625                                 &sdata->vif,
1626                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1627                                 GFP_KERNEL);
1628                 } else if (sig > thold &&
1629                            (last_event == 0 || sig > last_event + hyst)) {
1630                         ifmgd->last_cqm_event_signal = sig;
1631                         ieee80211_cqm_rssi_notify(
1632                                 &sdata->vif,
1633                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1634                                 GFP_KERNEL);
1635                 }
1636         }
1637
1638         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1639 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1640                 if (net_ratelimit()) {
1641                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1642                                "to a received beacon\n", sdata->name);
1643                 }
1644 #endif
1645                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1646                 mutex_lock(&local->iflist_mtx);
1647                 ieee80211_recalc_ps(local, -1);
1648                 mutex_unlock(&local->iflist_mtx);
1649         }
1650
1651         /*
1652          * Push the beacon loss detection into the future since
1653          * we are processing a beacon from the AP just now.
1654          */
1655         ieee80211_sta_reset_beacon_monitor(sdata);
1656
1657         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1658         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1659                                           len - baselen, &elems,
1660                                           care_about_ies, ncrc);
1661
1662         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1663                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1664                                                    ifmgd->aid);
1665
1666         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1667                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1668                                       true);
1669
1670                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1671                                          elems.wmm_param_len);
1672         }
1673
1674         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1675                 if (directed_tim) {
1676                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1677                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1678                                 ieee80211_hw_config(local,
1679                                                     IEEE80211_CONF_CHANGE_PS);
1680                                 ieee80211_send_nullfunc(local, sdata, 0);
1681                         } else {
1682                                 local->pspolling = true;
1683
1684                                 /*
1685                                  * Here is assumed that the driver will be
1686                                  * able to send ps-poll frame and receive a
1687                                  * response even though power save mode is
1688                                  * enabled, but some drivers might require
1689                                  * to disable power save here. This needs
1690                                  * to be investigated.
1691                                  */
1692                                 ieee80211_send_pspoll(local, sdata);
1693                         }
1694                 }
1695         }
1696
1697         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1698                 return;
1699         ifmgd->beacon_crc = ncrc;
1700         ifmgd->beacon_crc_valid = true;
1701
1702         if (elems.erp_info && elems.erp_info_len >= 1) {
1703                 erp_valid = true;
1704                 erp_value = elems.erp_info[0];
1705         } else {
1706                 erp_valid = false;
1707         }
1708         changed |= ieee80211_handle_bss_capability(sdata,
1709                         le16_to_cpu(mgmt->u.beacon.capab_info),
1710                         erp_valid, erp_value);
1711
1712
1713         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1714             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1715                 struct sta_info *sta;
1716                 struct ieee80211_supported_band *sband;
1717                 u16 ap_ht_cap_flags;
1718
1719                 rcu_read_lock();
1720
1721                 sta = sta_info_get(sdata, bssid);
1722                 if (WARN_ON(!sta)) {
1723                         rcu_read_unlock();
1724                         return;
1725                 }
1726
1727                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1728
1729                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1730                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1731
1732                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1733
1734                 rcu_read_unlock();
1735
1736                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1737                                                bssid, ap_ht_cap_flags);
1738         }
1739
1740         /* Note: country IE parsing is done for us by cfg80211 */
1741         if (elems.country_elem) {
1742                 /* TODO: IBSS also needs this */
1743                 if (elems.pwr_constr_elem)
1744                         ieee80211_handle_pwr_constr(sdata,
1745                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1746                                 elems.pwr_constr_elem,
1747                                 elems.pwr_constr_elem_len);
1748         }
1749
1750         ieee80211_bss_info_change_notify(sdata, changed);
1751 }
1752
1753 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1754                                   struct sk_buff *skb)
1755 {
1756         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1757         struct ieee80211_rx_status *rx_status;
1758         struct ieee80211_mgmt *mgmt;
1759         enum rx_mgmt_action rma = RX_MGMT_NONE;
1760         u16 fc;
1761
1762         rx_status = (struct ieee80211_rx_status *) skb->cb;
1763         mgmt = (struct ieee80211_mgmt *) skb->data;
1764         fc = le16_to_cpu(mgmt->frame_control);
1765
1766         mutex_lock(&ifmgd->mtx);
1767
1768         if (ifmgd->associated &&
1769             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1770                 switch (fc & IEEE80211_FCTL_STYPE) {
1771                 case IEEE80211_STYPE_BEACON:
1772                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1773                                                  rx_status);
1774                         break;
1775                 case IEEE80211_STYPE_PROBE_RESP:
1776                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1777                         break;
1778                 case IEEE80211_STYPE_DEAUTH:
1779                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1780                         break;
1781                 case IEEE80211_STYPE_DISASSOC:
1782                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1783                         break;
1784                 case IEEE80211_STYPE_ACTION:
1785                         switch (mgmt->u.action.category) {
1786                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1787                                 ieee80211_sta_process_chanswitch(sdata,
1788                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1789                                                 (void *)ifmgd->associated->priv,
1790                                                 rx_status->mactime);
1791                                 break;
1792                         }
1793                 }
1794                 mutex_unlock(&ifmgd->mtx);
1795
1796                 switch (rma) {
1797                 case RX_MGMT_NONE:
1798                         /* no action */
1799                         break;
1800                 case RX_MGMT_CFG80211_DEAUTH:
1801                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1802                         break;
1803                 case RX_MGMT_CFG80211_DISASSOC:
1804                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1805                         break;
1806                 default:
1807                         WARN(1, "unexpected: %d", rma);
1808                 }
1809                 return;
1810         }
1811
1812         mutex_unlock(&ifmgd->mtx);
1813
1814         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1815             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1816                 struct ieee80211_local *local = sdata->local;
1817                 struct ieee80211_work *wk;
1818
1819                 mutex_lock(&local->mtx);
1820                 list_for_each_entry(wk, &local->work_list, list) {
1821                         if (wk->sdata != sdata)
1822                                 continue;
1823
1824                         if (wk->type != IEEE80211_WORK_ASSOC &&
1825                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1826                                 continue;
1827
1828                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1829                                 continue;
1830                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1831                                 continue;
1832
1833                         /*
1834                          * Printing the message only here means we can't
1835                          * spuriously print it, but it also means that it
1836                          * won't be printed when the frame comes in before
1837                          * we even tried to associate or in similar cases.
1838                          *
1839                          * Ultimately, I suspect cfg80211 should print the
1840                          * messages instead.
1841                          */
1842                         printk(KERN_DEBUG
1843                                "%s: deauthenticated from %pM (Reason: %u)\n",
1844                                sdata->name, mgmt->bssid,
1845                                le16_to_cpu(mgmt->u.deauth.reason_code));
1846
1847                         list_del_rcu(&wk->list);
1848                         free_work(wk);
1849                         break;
1850                 }
1851                 mutex_unlock(&local->mtx);
1852
1853                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1854         }
1855 }
1856
1857 static void ieee80211_sta_timer(unsigned long data)
1858 {
1859         struct ieee80211_sub_if_data *sdata =
1860                 (struct ieee80211_sub_if_data *) data;
1861         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1862         struct ieee80211_local *local = sdata->local;
1863
1864         if (local->quiescing) {
1865                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1866                 return;
1867         }
1868
1869         ieee80211_queue_work(&local->hw, &sdata->work);
1870 }
1871
1872 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
1873 {
1874         struct ieee80211_local *local = sdata->local;
1875         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1876
1877         /* then process the rest of the work */
1878         mutex_lock(&ifmgd->mtx);
1879
1880         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1881                             IEEE80211_STA_CONNECTION_POLL) &&
1882             ifmgd->associated) {
1883                 u8 bssid[ETH_ALEN];
1884
1885                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1886                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1887                         run_again(ifmgd, ifmgd->probe_timeout);
1888
1889                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1890 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1891                         wiphy_debug(local->hw.wiphy,
1892                                     "%s: No probe response from AP %pM"
1893                                     " after %dms, try %d\n",
1894                                     sdata->name,
1895                                     bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ,
1896                                     ifmgd->probe_send_count);
1897 #endif
1898                         ieee80211_mgd_probe_ap_send(sdata);
1899                 } else {
1900                         /*
1901                          * We actually lost the connection ... or did we?
1902                          * Let's make sure!
1903                          */
1904                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1905                                           IEEE80211_STA_BEACON_POLL);
1906                         wiphy_debug(local->hw.wiphy,
1907                                     "%s: No probe response from AP %pM"
1908                                     " after %dms, disconnecting.\n",
1909                                     sdata->name,
1910                                     bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1911                         ieee80211_set_disassoc(sdata, true, true);
1912                         mutex_unlock(&ifmgd->mtx);
1913                         mutex_lock(&local->mtx);
1914                         ieee80211_recalc_idle(local);
1915                         mutex_unlock(&local->mtx);
1916                         /*
1917                          * must be outside lock due to cfg80211,
1918                          * but that's not a problem.
1919                          */
1920                         ieee80211_send_deauth_disassoc(sdata, bssid,
1921                                         IEEE80211_STYPE_DEAUTH,
1922                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1923                                         NULL, true);
1924                         mutex_lock(&ifmgd->mtx);
1925                 }
1926         }
1927
1928         mutex_unlock(&ifmgd->mtx);
1929 }
1930
1931 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1932 {
1933         struct ieee80211_sub_if_data *sdata =
1934                 (struct ieee80211_sub_if_data *) data;
1935         struct ieee80211_local *local = sdata->local;
1936
1937         if (local->quiescing)
1938                 return;
1939
1940         ieee80211_queue_work(&sdata->local->hw,
1941                              &sdata->u.mgd.beacon_connection_loss_work);
1942 }
1943
1944 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1945 {
1946         struct ieee80211_sub_if_data *sdata =
1947                 (struct ieee80211_sub_if_data *) data;
1948         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1949         struct ieee80211_local *local = sdata->local;
1950
1951         if (local->quiescing)
1952                 return;
1953
1954         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1955 }
1956
1957 static void ieee80211_sta_monitor_work(struct work_struct *work)
1958 {
1959         struct ieee80211_sub_if_data *sdata =
1960                 container_of(work, struct ieee80211_sub_if_data,
1961                              u.mgd.monitor_work);
1962
1963         ieee80211_mgd_probe_ap(sdata, false);
1964 }
1965
1966 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1967 {
1968         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1969                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1970                                         IEEE80211_STA_CONNECTION_POLL);
1971
1972                 /* let's probe the connection once */
1973                 ieee80211_queue_work(&sdata->local->hw,
1974                            &sdata->u.mgd.monitor_work);
1975                 /* and do all the other regular work too */
1976                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1977         }
1978 }
1979
1980 #ifdef CONFIG_PM
1981 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1982 {
1983         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1984
1985         /*
1986          * we need to use atomic bitops for the running bits
1987          * only because both timers might fire at the same
1988          * time -- the code here is properly synchronised.
1989          */
1990
1991         cancel_work_sync(&ifmgd->request_smps_work);
1992
1993         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1994         if (del_timer_sync(&ifmgd->timer))
1995                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1996
1997         cancel_work_sync(&ifmgd->chswitch_work);
1998         if (del_timer_sync(&ifmgd->chswitch_timer))
1999                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2000
2001         cancel_work_sync(&ifmgd->monitor_work);
2002         /* these will just be re-established on connection */
2003         del_timer_sync(&ifmgd->conn_mon_timer);
2004         del_timer_sync(&ifmgd->bcn_mon_timer);
2005 }
2006
2007 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2008 {
2009         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2010
2011         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2012                 add_timer(&ifmgd->timer);
2013         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2014                 add_timer(&ifmgd->chswitch_timer);
2015 }
2016 #endif
2017
2018 /* interface setup */
2019 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2020 {
2021         struct ieee80211_if_managed *ifmgd;
2022
2023         ifmgd = &sdata->u.mgd;
2024         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2025         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2026         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2027                   ieee80211_beacon_connection_loss_work);
2028         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2029         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2030                     (unsigned long) sdata);
2031         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2032                     (unsigned long) sdata);
2033         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2034                     (unsigned long) sdata);
2035         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2036                     (unsigned long) sdata);
2037
2038         ifmgd->flags = 0;
2039
2040         mutex_init(&ifmgd->mtx);
2041
2042         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2043                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2044         else
2045                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2046 }
2047
2048 /* scan finished notification */
2049 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2050 {
2051         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2052
2053         /* Restart STA timers */
2054         rcu_read_lock();
2055         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2056                 ieee80211_restart_sta_timer(sdata);
2057         rcu_read_unlock();
2058 }
2059
2060 int ieee80211_max_network_latency(struct notifier_block *nb,
2061                                   unsigned long data, void *dummy)
2062 {
2063         s32 latency_usec = (s32) data;
2064         struct ieee80211_local *local =
2065                 container_of(nb, struct ieee80211_local,
2066                              network_latency_notifier);
2067
2068         mutex_lock(&local->iflist_mtx);
2069         ieee80211_recalc_ps(local, latency_usec);
2070         mutex_unlock(&local->iflist_mtx);
2071
2072         return 0;
2073 }
2074
2075 /* config hooks */
2076 static enum work_done_result
2077 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2078                           struct sk_buff *skb)
2079 {
2080         if (!skb) {
2081                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2082                 return WORK_DONE_DESTROY;
2083         }
2084
2085         if (wk->type == IEEE80211_WORK_AUTH) {
2086                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2087                 return WORK_DONE_DESTROY;
2088         }
2089
2090         mutex_lock(&wk->sdata->u.mgd.mtx);
2091         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2092         mutex_unlock(&wk->sdata->u.mgd.mtx);
2093
2094         wk->type = IEEE80211_WORK_AUTH;
2095         wk->probe_auth.tries = 0;
2096         return WORK_DONE_REQUEUE;
2097 }
2098
2099 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2100                        struct cfg80211_auth_request *req)
2101 {
2102         const u8 *ssid;
2103         struct ieee80211_work *wk;
2104         u16 auth_alg;
2105
2106         if (req->local_state_change)
2107                 return 0; /* no need to update mac80211 state */
2108
2109         switch (req->auth_type) {
2110         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2111                 auth_alg = WLAN_AUTH_OPEN;
2112                 break;
2113         case NL80211_AUTHTYPE_SHARED_KEY:
2114                 if (IS_ERR(sdata->local->wep_tx_tfm))
2115                         return -EOPNOTSUPP;
2116                 auth_alg = WLAN_AUTH_SHARED_KEY;
2117                 break;
2118         case NL80211_AUTHTYPE_FT:
2119                 auth_alg = WLAN_AUTH_FT;
2120                 break;
2121         case NL80211_AUTHTYPE_NETWORK_EAP:
2122                 auth_alg = WLAN_AUTH_LEAP;
2123                 break;
2124         default:
2125                 return -EOPNOTSUPP;
2126         }
2127
2128         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2129         if (!wk)
2130                 return -ENOMEM;
2131
2132         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2133
2134         if (req->ie && req->ie_len) {
2135                 memcpy(wk->ie, req->ie, req->ie_len);
2136                 wk->ie_len = req->ie_len;
2137         }
2138
2139         if (req->key && req->key_len) {
2140                 wk->probe_auth.key_len = req->key_len;
2141                 wk->probe_auth.key_idx = req->key_idx;
2142                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2143         }
2144
2145         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2146         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2147         wk->probe_auth.ssid_len = ssid[1];
2148
2149         wk->probe_auth.algorithm = auth_alg;
2150         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2151
2152         /* if we already have a probe, don't probe again */
2153         if (req->bss->proberesp_ies)
2154                 wk->type = IEEE80211_WORK_AUTH;
2155         else
2156                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2157         wk->chan = req->bss->channel;
2158         wk->sdata = sdata;
2159         wk->done = ieee80211_probe_auth_done;
2160
2161         ieee80211_add_work(wk);
2162         return 0;
2163 }
2164
2165 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2166                                                   struct sk_buff *skb)
2167 {
2168         struct ieee80211_mgmt *mgmt;
2169         struct ieee80211_rx_status *rx_status;
2170         struct ieee802_11_elems elems;
2171         u16 status;
2172
2173         if (!skb) {
2174                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2175                 return WORK_DONE_DESTROY;
2176         }
2177
2178         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2179                 mutex_lock(&wk->sdata->u.mgd.mtx);
2180                 rx_status = (void *) skb->cb;
2181                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2182                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2183                                       &elems, true);
2184                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2185
2186                 wk->type = IEEE80211_WORK_ASSOC;
2187                 /* not really done yet */
2188                 return WORK_DONE_REQUEUE;
2189         }
2190
2191         mgmt = (void *)skb->data;
2192         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2193
2194         if (status == WLAN_STATUS_SUCCESS) {
2195                 mutex_lock(&wk->sdata->u.mgd.mtx);
2196                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2197                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2198                         /* oops -- internal error -- send timeout for now */
2199                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2200                                                     wk->filter_ta);
2201                         return WORK_DONE_DESTROY;
2202                 }
2203
2204                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2205         }
2206
2207         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2208         return WORK_DONE_DESTROY;
2209 }
2210
2211 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2212                         struct cfg80211_assoc_request *req)
2213 {
2214         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2215         struct ieee80211_bss *bss = (void *)req->bss->priv;
2216         struct ieee80211_work *wk;
2217         const u8 *ssid;
2218         int i;
2219
2220         mutex_lock(&ifmgd->mtx);
2221         if (ifmgd->associated) {
2222                 if (!req->prev_bssid ||
2223                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2224                            ETH_ALEN)) {
2225                         /*
2226                          * We are already associated and the request was not a
2227                          * reassociation request from the current BSS, so
2228                          * reject it.
2229                          */
2230                         mutex_unlock(&ifmgd->mtx);
2231                         return -EALREADY;
2232                 }
2233
2234                 /* Trying to reassociate - clear previous association state */
2235                 ieee80211_set_disassoc(sdata, true, false);
2236         }
2237         mutex_unlock(&ifmgd->mtx);
2238
2239         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2240         if (!wk)
2241                 return -ENOMEM;
2242
2243         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2244         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2245
2246         ifmgd->beacon_crc_valid = false;
2247
2248         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2249                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2250                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2251                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2252                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2253
2254
2255         if (req->ie && req->ie_len) {
2256                 memcpy(wk->ie, req->ie, req->ie_len);
2257                 wk->ie_len = req->ie_len;
2258         } else
2259                 wk->ie_len = 0;
2260
2261         wk->assoc.bss = req->bss;
2262
2263         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2264
2265         /* new association always uses requested smps mode */
2266         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2267                 if (ifmgd->powersave)
2268                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2269                 else
2270                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2271         } else
2272                 ifmgd->ap_smps = ifmgd->req_smps;
2273
2274         wk->assoc.smps = ifmgd->ap_smps;
2275         /*
2276          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2277          * We still associate in non-HT mode (11a/b/g) if any one of these
2278          * ciphers is configured as pairwise.
2279          * We can set this to true for non-11n hardware, that'll be checked
2280          * separately along with the peer capabilities.
2281          */
2282         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2283         wk->assoc.capability = req->bss->capability;
2284         wk->assoc.wmm_used = bss->wmm_used;
2285         wk->assoc.supp_rates = bss->supp_rates;
2286         wk->assoc.supp_rates_len = bss->supp_rates_len;
2287         wk->assoc.ht_information_ie =
2288                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2289
2290         if (bss->wmm_used && bss->uapsd_supported &&
2291             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2292                 wk->assoc.uapsd_used = true;
2293                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2294         } else {
2295                 wk->assoc.uapsd_used = false;
2296                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2297         }
2298
2299         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2300         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2301         wk->assoc.ssid_len = ssid[1];
2302
2303         if (req->prev_bssid)
2304                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2305
2306         wk->chan = req->bss->channel;
2307         wk->sdata = sdata;
2308         wk->done = ieee80211_assoc_done;
2309         if (!bss->dtim_period &&
2310             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2311                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2312         else
2313                 wk->type = IEEE80211_WORK_ASSOC;
2314
2315         if (req->use_mfp) {
2316                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2317                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2318         } else {
2319                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2320                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2321         }
2322
2323         if (req->crypto.control_port)
2324                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2325         else
2326                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2327
2328         sdata->control_port_protocol = req->crypto.control_port_ethertype;
2329         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2330
2331         ieee80211_add_work(wk);
2332         return 0;
2333 }
2334
2335 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2336                          struct cfg80211_deauth_request *req,
2337                          void *cookie)
2338 {
2339         struct ieee80211_local *local = sdata->local;
2340         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2341         struct ieee80211_work *wk;
2342         u8 bssid[ETH_ALEN];
2343         bool assoc_bss = false;
2344
2345         mutex_lock(&ifmgd->mtx);
2346
2347         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2348         if (ifmgd->associated == req->bss) {
2349                 ieee80211_set_disassoc(sdata, false, true);
2350                 mutex_unlock(&ifmgd->mtx);
2351                 assoc_bss = true;
2352         } else {
2353                 bool not_auth_yet = false;
2354
2355                 mutex_unlock(&ifmgd->mtx);
2356
2357                 mutex_lock(&local->mtx);
2358                 list_for_each_entry(wk, &local->work_list, list) {
2359                         if (wk->sdata != sdata)
2360                                 continue;
2361
2362                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2363                             wk->type != IEEE80211_WORK_AUTH &&
2364                             wk->type != IEEE80211_WORK_ASSOC &&
2365                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2366                                 continue;
2367
2368                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2369                                 continue;
2370
2371                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2372                         list_del_rcu(&wk->list);
2373                         free_work(wk);
2374                         break;
2375                 }
2376                 mutex_unlock(&local->mtx);
2377
2378                 /*
2379                  * If somebody requests authentication and we haven't
2380                  * sent out an auth frame yet there's no need to send
2381                  * out a deauth frame either. If the state was PROBE,
2382                  * then this is the case. If it's AUTH we have sent a
2383                  * frame, and if it's IDLE we have completed the auth
2384                  * process already.
2385                  */
2386                 if (not_auth_yet) {
2387                         __cfg80211_auth_canceled(sdata->dev, bssid);
2388                         return 0;
2389                 }
2390         }
2391
2392         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2393                sdata->name, bssid, req->reason_code);
2394
2395         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2396                                        req->reason_code, cookie,
2397                                        !req->local_state_change);
2398         if (assoc_bss)
2399                 sta_info_destroy_addr(sdata, bssid);
2400
2401         mutex_lock(&sdata->local->mtx);
2402         ieee80211_recalc_idle(sdata->local);
2403         mutex_unlock(&sdata->local->mtx);
2404
2405         return 0;
2406 }
2407
2408 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2409                            struct cfg80211_disassoc_request *req,
2410                            void *cookie)
2411 {
2412         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2413         u8 bssid[ETH_ALEN];
2414
2415         mutex_lock(&ifmgd->mtx);
2416
2417         /*
2418          * cfg80211 should catch this ... but it's racy since
2419          * we can receive a disassoc frame, process it, hand it
2420          * to cfg80211 while that's in a locked section already
2421          * trying to tell us that the user wants to disconnect.
2422          */
2423         if (ifmgd->associated != req->bss) {
2424                 mutex_unlock(&ifmgd->mtx);
2425                 return -ENOLINK;
2426         }
2427
2428         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2429                sdata->name, req->bss->bssid, req->reason_code);
2430
2431         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2432         ieee80211_set_disassoc(sdata, false, true);
2433
2434         mutex_unlock(&ifmgd->mtx);
2435
2436         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2437                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2438                         cookie, !req->local_state_change);
2439         sta_info_destroy_addr(sdata, bssid);
2440
2441         mutex_lock(&sdata->local->mtx);
2442         ieee80211_recalc_idle(sdata->local);
2443         mutex_unlock(&sdata->local->mtx);
2444
2445         return 0;
2446 }
2447
2448 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2449                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2450                                gfp_t gfp)
2451 {
2452         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2453
2454         trace_api_cqm_rssi_notify(sdata, rssi_event);
2455
2456         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2457 }
2458 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);