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