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                 wiphy_debug(local->hw.wiphy,
 782                             "WMM queue=%d aci=%d acm=%d aifs=%d "
 783                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 784                             queue, aci, acm,
 785                             params.aifs, params.cw_min, params.cw_max,
 786                             params.txop, params.uapsd);
 787 #endif
 788                 if (drv_conf_tx(local, queue, &params))
 789                         wiphy_debug(local->hw.wiphy,
 790                                     "failed to set TX queue parameters for queue %d\n",
 791                                     queue);
 792         }
 793
 794         /* enable WMM or activate new settings */
 795         sdata->vif.bss_conf.qos = true;
 796         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 797 }
 798
 799 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 800                                            u16 capab, bool erp_valid, u8 erp)
 801 {
 802         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 803         u32 changed = 0;
 804         bool use_protection;
 805         bool use_short_preamble;
 806         bool use_short_slot;
 807
 808         if (erp_valid) {
 809                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 810                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 811         } else {
 812                 use_protection = false;
 813                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 814         }
 815
 816         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 817         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 818                 use_short_slot = true;
 819
 820         if (use_protection != bss_conf->use_cts_prot) {
 821                 bss_conf->use_cts_prot = use_protection;
 822                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 823         }
 824
 825         if (use_short_preamble != bss_conf->use_short_preamble) {
 826                 bss_conf->use_short_preamble = use_short_preamble;
 827                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 828         }
 829
 830         if (use_short_slot != bss_conf->use_short_slot) {
 831                 bss_conf->use_short_slot = use_short_slot;
 832                 changed |= BSS_CHANGED_ERP_SLOT;
 833         }
 834
 835         return changed;
 836 }
 837
 838 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 839                                      struct cfg80211_bss *cbss,
 840                                      u32 bss_info_changed)
 841 {
 842         struct ieee80211_bss *bss = (void *)cbss->priv;
 843         struct ieee80211_local *local = sdata->local;
 844         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 845
 846         bss_info_changed |= BSS_CHANGED_ASSOC;
 847         /* set timing information */
 848         bss_conf->beacon_int = cbss->beacon_interval;
 849         bss_conf->timestamp = cbss->tsf;
 850
 851         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 852         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 853                 cbss->capability, bss->has_erp_value, bss->erp_value);
 854
 855         sdata->u.mgd.associated = cbss;
 856         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 857
 858         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 859
 860         /* just to be sure */
 861         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 862                                 IEEE80211_STA_BEACON_POLL);
 863
 864         /*
 865          * Always handle WMM once after association regardless
 866          * of the first value the AP uses. Setting -1 here has
 867          * that effect because the AP values is an unsigned
 868          * 4-bit value.
 869          */
 870         sdata->u.mgd.wmm_last_param_set = -1;
 871
 872         ieee80211_led_assoc(local, 1);
 873
 874         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
 875                 bss_conf->dtim_period = bss->dtim_period;
 876         else
 877                 bss_conf->dtim_period = 0;
 878
 879         bss_conf->assoc = 1;
 880         /*
 881          * For now just always ask the driver to update the basic rateset
 882          * when we have associated, we aren't checking whether it actually
 883          * changed or not.
 884          */
 885         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 886
 887         /* And the BSSID changed - we're associated now */
 888         bss_info_changed |= BSS_CHANGED_BSSID;
 889
 890         /* Tell the driver to monitor connection quality (if supported) */
 891         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 892             bss_conf->cqm_rssi_thold)
 893                 bss_info_changed |= BSS_CHANGED_CQM;
 894
 895         /* Enable ARP filtering */
 896         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
 897                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 898                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
 899         }
 900
 901         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 902
 903         mutex_lock(&local->iflist_mtx);
 904         ieee80211_recalc_ps(local, -1);
 905         ieee80211_recalc_smps(local, sdata);
 906         mutex_unlock(&local->iflist_mtx);
 907
 908         netif_tx_start_all_queues(sdata->dev);
 909         netif_carrier_on(sdata->dev);
 910 }
 911
 912 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 913                                    bool remove_sta)
 914 {
 915         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 916         struct ieee80211_local *local = sdata->local;
 917         struct sta_info *sta;
 918         u32 changed = 0, config_changed = 0;
 919         u8 bssid[ETH_ALEN];
 920
 921         ASSERT_MGD_MTX(ifmgd);
 922
 923         if (WARN_ON(!ifmgd->associated))
 924                 return;
 925
 926         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 927
 928         ifmgd->associated = NULL;
 929         memset(ifmgd->bssid, 0, ETH_ALEN);
 930
 931         /*
 932          * we need to commit the associated = NULL change because the
 933          * scan code uses that to determine whether this iface should
 934          * go to/wake up from powersave or not -- and could otherwise
 935          * wake the queues erroneously.
 936          */
 937         smp_mb();
 938
 939         /*
 940          * Thus, we can only afterwards stop the queues -- to account
 941          * for the case where another CPU is finishing a scan at this
 942          * time -- we don't want the scan code to enable queues.
 943          */
 944
 945         netif_tx_stop_all_queues(sdata->dev);
 946         netif_carrier_off(sdata->dev);
 947
 948         mutex_lock(&local->sta_mtx);
 949         sta = sta_info_get(sdata, bssid);
 950         if (sta) {
 951                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
 952                 ieee80211_sta_tear_down_BA_sessions(sta);
 953         }
 954         mutex_unlock(&local->sta_mtx);
 955
 956         changed |= ieee80211_reset_erp_info(sdata);
 957
 958         ieee80211_led_assoc(local, 0);
 959         changed |= BSS_CHANGED_ASSOC;
 960         sdata->vif.bss_conf.assoc = false;
 961
 962         ieee80211_set_wmm_default(sdata);
 963
 964         /* channel(_type) changes are handled by ieee80211_hw_config */
 965         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
 966
 967         /* on the next assoc, re-program HT parameters */
 968         sdata->ht_opmode_valid = false;
 969
 970         local->power_constr_level = 0;
 971
 972         del_timer_sync(&local->dynamic_ps_timer);
 973         cancel_work_sync(&local->dynamic_ps_enable_work);
 974
 975         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 976                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 977                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 978         }
 979
 980         ieee80211_hw_config(local, config_changed);
 981
 982         /* Disable ARP filtering */
 983         if (sdata->vif.bss_conf.arp_filter_enabled) {
 984                 sdata->vif.bss_conf.arp_filter_enabled = false;
 985                 changed |= BSS_CHANGED_ARP_FILTER;
 986         }
 987
 988         /* The BSSID (not really interesting) and HT changed */
 989         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
 990         ieee80211_bss_info_change_notify(sdata, changed);
 991
 992         if (remove_sta)
 993                 sta_info_destroy_addr(sdata, bssid);
 994 }
 995
 996 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 997                              struct ieee80211_hdr *hdr)
 998 {
 999         /*
1000          * We can postpone the mgd.timer whenever receiving unicast frames
1001          * from AP because we know that the connection is working both ways
1002          * at that time. But multicast frames (and hence also beacons) must
1003          * be ignored here, because we need to trigger the timer during
1004          * data idle periods for sending the periodic probe request to the
1005          * AP we're connected to.
1006          */
1007         if (is_multicast_ether_addr(hdr->addr1))
1008                 return;
1009
1010         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1011                 return;
1012
1013         mod_timer(&sdata->u.mgd.conn_mon_timer,
1014                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1015 }
1016
1017 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1018 {
1019         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1020         const u8 *ssid;
1021
1022         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1023         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
1024                                  ssid + 2, ssid[1], NULL, 0);
1025
1026         ifmgd->probe_send_count++;
1027         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1028         run_again(ifmgd, ifmgd->probe_timeout);
1029 }
1030
1031 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1032                                    bool beacon)
1033 {
1034         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1035         bool already = false;
1036
1037         if (!ieee80211_sdata_running(sdata))
1038                 return;
1039
1040         if (sdata->local->scanning)
1041                 return;
1042
1043         if (sdata->local->tmp_channel)
1044                 return;
1045
1046         mutex_lock(&ifmgd->mtx);
1047
1048         if (!ifmgd->associated)
1049                 goto out;
1050
1051 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1052         if (beacon && net_ratelimit())
1053                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1054                        "- sending probe request\n", sdata->name);
1055 #endif
1056
1057         /*
1058          * The driver/our work has already reported this event or the
1059          * connection monitoring has kicked in and we have already sent
1060          * a probe request. Or maybe the AP died and the driver keeps
1061          * reporting until we disassociate...
1062          *
1063          * In either case we have to ignore the current call to this
1064          * function (except for setting the correct probe reason bit)
1065          * because otherwise we would reset the timer every time and
1066          * never check whether we received a probe response!
1067          */
1068         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1069                             IEEE80211_STA_CONNECTION_POLL))
1070                 already = true;
1071
1072         if (beacon)
1073                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1074         else
1075                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1076
1077         if (already)
1078                 goto out;
1079
1080         mutex_lock(&sdata->local->iflist_mtx);
1081         ieee80211_recalc_ps(sdata->local, -1);
1082         mutex_unlock(&sdata->local->iflist_mtx);
1083
1084         ifmgd->probe_send_count = 0;
1085         ieee80211_mgd_probe_ap_send(sdata);
1086  out:
1087         mutex_unlock(&ifmgd->mtx);
1088 }
1089
1090 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1091 {
1092         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1093         struct ieee80211_local *local = sdata->local;
1094         u8 bssid[ETH_ALEN];
1095
1096         mutex_lock(&ifmgd->mtx);
1097         if (!ifmgd->associated) {
1098                 mutex_unlock(&ifmgd->mtx);
1099                 return;
1100         }
1101
1102         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1103
1104         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1105
1106         ieee80211_set_disassoc(sdata, true);
1107         mutex_unlock(&ifmgd->mtx);
1108
1109         mutex_lock(&local->mtx);
1110         ieee80211_recalc_idle(local);
1111         mutex_unlock(&local->mtx);
1112         /*
1113          * must be outside lock due to cfg80211,
1114          * but that's not a problem.
1115          */
1116         ieee80211_send_deauth_disassoc(sdata, bssid,
1117                                        IEEE80211_STYPE_DEAUTH,
1118                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1119                                        NULL, true);
1120 }
1121
1122 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1123 {
1124         struct ieee80211_sub_if_data *sdata =
1125                 container_of(work, struct ieee80211_sub_if_data,
1126                              u.mgd.beacon_connection_loss_work);
1127
1128         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1129                 __ieee80211_connection_loss(sdata);
1130         else
1131                 ieee80211_mgd_probe_ap(sdata, true);
1132 }
1133
1134 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1135 {
1136         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1137         struct ieee80211_hw *hw = &sdata->local->hw;
1138
1139         trace_api_beacon_loss(sdata);
1140
1141         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1142         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1143 }
1144 EXPORT_SYMBOL(ieee80211_beacon_loss);
1145
1146 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1147 {
1148         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1149         struct ieee80211_hw *hw = &sdata->local->hw;
1150
1151         trace_api_connection_loss(sdata);
1152
1153         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1154         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1155 }
1156 EXPORT_SYMBOL(ieee80211_connection_loss);
1157
1158
1159 static enum rx_mgmt_action __must_check
1160 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1161                          struct ieee80211_mgmt *mgmt, size_t len)
1162 {
1163         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1164         const u8 *bssid = NULL;
1165         u16 reason_code;
1166
1167         if (len < 24 + 2)
1168                 return RX_MGMT_NONE;
1169
1170         ASSERT_MGD_MTX(ifmgd);
1171
1172         bssid = ifmgd->associated->bssid;
1173
1174         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1175
1176         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1177                         sdata->name, bssid, reason_code);
1178
1179         ieee80211_set_disassoc(sdata, true);
1180         mutex_lock(&sdata->local->mtx);
1181         ieee80211_recalc_idle(sdata->local);
1182         mutex_unlock(&sdata->local->mtx);
1183
1184         return RX_MGMT_CFG80211_DEAUTH;
1185 }
1186
1187
1188 static enum rx_mgmt_action __must_check
1189 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1190                            struct ieee80211_mgmt *mgmt, size_t len)
1191 {
1192         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1193         u16 reason_code;
1194
1195         if (len < 24 + 2)
1196                 return RX_MGMT_NONE;
1197
1198         ASSERT_MGD_MTX(ifmgd);
1199
1200         if (WARN_ON(!ifmgd->associated))
1201                 return RX_MGMT_NONE;
1202
1203         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1204                 return RX_MGMT_NONE;
1205
1206         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1207
1208         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1209                         sdata->name, mgmt->sa, reason_code);
1210
1211         ieee80211_set_disassoc(sdata, true);
1212         mutex_lock(&sdata->local->mtx);
1213         ieee80211_recalc_idle(sdata->local);
1214         mutex_unlock(&sdata->local->mtx);
1215         return RX_MGMT_CFG80211_DISASSOC;
1216 }
1217
1218
1219 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1220                                     struct ieee80211_mgmt *mgmt, size_t len)
1221 {
1222         struct ieee80211_sub_if_data *sdata = wk->sdata;
1223         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1224         struct ieee80211_local *local = sdata->local;
1225         struct ieee80211_supported_band *sband;
1226         struct sta_info *sta;
1227         struct cfg80211_bss *cbss = wk->assoc.bss;
1228         u8 *pos;
1229         u32 rates, basic_rates;
1230         u16 capab_info, aid;
1231         struct ieee802_11_elems elems;
1232         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1233         u32 changed = 0;
1234         int i, j, err;
1235         bool have_higher_than_11mbit = false;
1236         u16 ap_ht_cap_flags;
1237
1238         /* AssocResp and ReassocResp have identical structure */
1239
1240         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1241         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1242
1243         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1244                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1245                        "set\n", sdata->name, aid);
1246         aid &= ~(BIT(15) | BIT(14));
1247
1248         pos = mgmt->u.assoc_resp.variable;
1249         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1250
1251         if (!elems.supp_rates) {
1252                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1253                        sdata->name);
1254                 return false;
1255         }
1256
1257         ifmgd->aid = aid;
1258
1259         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1260         if (!sta) {
1261                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1262                        " the AP\n", sdata->name);
1263                 return false;
1264         }
1265
1266         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1267                            WLAN_STA_ASSOC_AP);
1268         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1269                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1270
1271         rates = 0;
1272         basic_rates = 0;
1273         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1274
1275         for (i = 0; i < elems.supp_rates_len; i++) {
1276                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1277                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1278
1279                 if (rate > 110)
1280                         have_higher_than_11mbit = true;
1281
1282                 for (j = 0; j < sband->n_bitrates; j++) {
1283                         if (sband->bitrates[j].bitrate == rate) {
1284                                 rates |= BIT(j);
1285                                 if (is_basic)
1286                                         basic_rates |= BIT(j);
1287                                 break;
1288                         }
1289                 }
1290         }
1291
1292         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1293                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1294                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1295
1296                 if (rate > 110)
1297                         have_higher_than_11mbit = true;
1298
1299                 for (j = 0; j < sband->n_bitrates; j++) {
1300                         if (sband->bitrates[j].bitrate == rate) {
1301                                 rates |= BIT(j);
1302                                 if (is_basic)
1303                                         basic_rates |= BIT(j);
1304                                 break;
1305                         }
1306                 }
1307         }
1308
1309         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1310         sdata->vif.bss_conf.basic_rates = basic_rates;
1311
1312         /* cf. IEEE 802.11 9.2.12 */
1313         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1314             have_higher_than_11mbit)
1315                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1316         else
1317                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1318
1319         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1320                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1321                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1322
1323         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1324
1325         rate_control_rate_init(sta);
1326
1327         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1328                 set_sta_flags(sta, WLAN_STA_MFP);
1329
1330         if (elems.wmm_param)
1331                 set_sta_flags(sta, WLAN_STA_WME);
1332
1333         err = sta_info_insert(sta);
1334         sta = NULL;
1335         if (err) {
1336                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1337                        " the AP (error %d)\n", sdata->name, err);
1338                 return false;
1339         }
1340
1341         if (elems.wmm_param)
1342                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1343                                          elems.wmm_param_len);
1344         else
1345                 ieee80211_set_wmm_default(sdata);
1346
1347         local->oper_channel = wk->chan;
1348
1349         if (elems.ht_info_elem && elems.wmm_param &&
1350             (sdata->local->hw.queues >= 4) &&
1351             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1352                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1353                                                cbss->bssid, ap_ht_cap_flags);
1354
1355         /* set AID and assoc capability,
1356          * ieee80211_set_associated() will tell the driver */
1357         bss_conf->aid = aid;
1358         bss_conf->assoc_capability = capab_info;
1359         ieee80211_set_associated(sdata, cbss, changed);
1360
1361         /*
1362          * If we're using 4-addr mode, let the AP know that we're
1363          * doing so, so that it can create the STA VLAN on its side
1364          */
1365         if (ifmgd->use_4addr)
1366                 ieee80211_send_4addr_nullfunc(local, sdata);
1367
1368         /*
1369          * Start timer to probe the connection to the AP now.
1370          * Also start the timer that will detect beacon loss.
1371          */
1372         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1373         mod_beacon_timer(sdata);
1374
1375         return true;
1376 }
1377
1378
1379 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1380                                   struct ieee80211_mgmt *mgmt,
1381                                   size_t len,
1382                                   struct ieee80211_rx_status *rx_status,
1383                                   struct ieee802_11_elems *elems,
1384                                   bool beacon)
1385 {
1386         struct ieee80211_local *local = sdata->local;
1387         int freq;
1388         struct ieee80211_bss *bss;
1389         struct ieee80211_channel *channel;
1390         bool need_ps = false;
1391
1392         if (sdata->u.mgd.associated) {
1393                 bss = (void *)sdata->u.mgd.associated->priv;
1394                 /* not previously set so we may need to recalc */
1395                 need_ps = !bss->dtim_period;
1396         }
1397
1398         if (elems->ds_params && elems->ds_params_len == 1)
1399                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1400         else
1401                 freq = rx_status->freq;
1402
1403         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1404
1405         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1406                 return;
1407
1408         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1409                                         channel, beacon);
1410         if (bss)
1411                 ieee80211_rx_bss_put(local, bss);
1412
1413         if (!sdata->u.mgd.associated)
1414                 return;
1415
1416         if (need_ps) {
1417                 mutex_lock(&local->iflist_mtx);
1418                 ieee80211_recalc_ps(local, -1);
1419                 mutex_unlock(&local->iflist_mtx);
1420         }
1421
1422         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1423             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1424                                                         ETH_ALEN) == 0)) {
1425                 struct ieee80211_channel_sw_ie *sw_elem =
1426                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1427                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1428                                                  bss, rx_status->mactime);
1429         }
1430 }
1431
1432
1433 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1434                                          struct sk_buff *skb)
1435 {
1436         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1437         struct ieee80211_if_managed *ifmgd;
1438         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1439         size_t baselen, len = skb->len;
1440         struct ieee802_11_elems elems;
1441
1442         ifmgd = &sdata->u.mgd;
1443
1444         ASSERT_MGD_MTX(ifmgd);
1445
1446         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1447                 return; /* ignore ProbeResp to foreign address */
1448
1449         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1450         if (baselen > len)
1451                 return;
1452
1453         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1454                                 &elems);
1455
1456         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1457
1458         if (ifmgd->associated &&
1459             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1460             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1461                             IEEE80211_STA_CONNECTION_POLL)) {
1462                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1463                                   IEEE80211_STA_BEACON_POLL);
1464                 mutex_lock(&sdata->local->iflist_mtx);
1465                 ieee80211_recalc_ps(sdata->local, -1);
1466                 mutex_unlock(&sdata->local->iflist_mtx);
1467
1468                 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1469                         return;
1470
1471                 /*
1472                  * We've received a probe response, but are not sure whether
1473                  * we have or will be receiving any beacons or data, so let's
1474                  * schedule the timers again, just in case.
1475                  */
1476                 mod_beacon_timer(sdata);
1477
1478                 mod_timer(&ifmgd->conn_mon_timer,
1479                           round_jiffies_up(jiffies +
1480                                            IEEE80211_CONNECTION_IDLE_TIME));
1481         }
1482 }
1483
1484 /*
1485  * This is the canonical list of information elements we care about,
1486  * the filter code also gives us all changes to the Microsoft OUI
1487  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1488  *
1489  * We implement beacon filtering in software since that means we can
1490  * avoid processing the frame here and in cfg80211, and userspace
1491  * will not be able to tell whether the hardware supports it or not.
1492  *
1493  * XXX: This list needs to be dynamic -- userspace needs to be able to
1494  *      add items it requires. It also needs to be able to tell us to
1495  *      look out for other vendor IEs.
1496  */
1497 static const u64 care_about_ies =
1498         (1ULL << WLAN_EID_COUNTRY) |
1499         (1ULL << WLAN_EID_ERP_INFO) |
1500         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1501         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1502         (1ULL << WLAN_EID_HT_CAPABILITY) |
1503         (1ULL << WLAN_EID_HT_INFORMATION);
1504
1505 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1506                                      struct ieee80211_mgmt *mgmt,
1507                                      size_t len,
1508                                      struct ieee80211_rx_status *rx_status)
1509 {
1510         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1511         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1512         size_t baselen;
1513         struct ieee802_11_elems elems;
1514         struct ieee80211_local *local = sdata->local;
1515         u32 changed = 0;
1516         bool erp_valid, directed_tim = false;
1517         u8 erp_value = 0;
1518         u32 ncrc;
1519         u8 *bssid;
1520
1521         ASSERT_MGD_MTX(ifmgd);
1522
1523         /* Process beacon from the current BSS */
1524         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1525         if (baselen > len)
1526                 return;
1527
1528         if (rx_status->freq != local->hw.conf.channel->center_freq)
1529                 return;
1530
1531         /*
1532          * We might have received a number of frames, among them a
1533          * disassoc frame and a beacon...
1534          */
1535         if (!ifmgd->associated)
1536                 return;
1537
1538         bssid = ifmgd->associated->bssid;
1539
1540         /*
1541          * And in theory even frames from a different AP we were just
1542          * associated to a split-second ago!
1543          */
1544         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1545                 return;
1546
1547         /* Track average RSSI from the Beacon frames of the current AP */
1548         ifmgd->last_beacon_signal = rx_status->signal;
1549         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1550                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1551                 ifmgd->ave_beacon_signal = rx_status->signal;
1552                 ifmgd->last_cqm_event_signal = 0;
1553         } else {
1554                 ifmgd->ave_beacon_signal =
1555                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1556                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1557                          ifmgd->ave_beacon_signal) / 16;
1558         }
1559         if (bss_conf->cqm_rssi_thold &&
1560             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1561                 int sig = ifmgd->ave_beacon_signal / 16;
1562                 int last_event = ifmgd->last_cqm_event_signal;
1563                 int thold = bss_conf->cqm_rssi_thold;
1564                 int hyst = bss_conf->cqm_rssi_hyst;
1565                 if (sig < thold &&
1566                     (last_event == 0 || sig < last_event - hyst)) {
1567                         ifmgd->last_cqm_event_signal = sig;
1568                         ieee80211_cqm_rssi_notify(
1569                                 &sdata->vif,
1570                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1571                                 GFP_KERNEL);
1572                 } else if (sig > thold &&
1573                            (last_event == 0 || sig > last_event + hyst)) {
1574                         ifmgd->last_cqm_event_signal = sig;
1575                         ieee80211_cqm_rssi_notify(
1576                                 &sdata->vif,
1577                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1578                                 GFP_KERNEL);
1579                 }
1580         }
1581
1582         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1583 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1584                 if (net_ratelimit()) {
1585                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1586                                "to a received beacon\n", sdata->name);
1587                 }
1588 #endif
1589                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1590                 mutex_lock(&local->iflist_mtx);
1591                 ieee80211_recalc_ps(local, -1);
1592                 mutex_unlock(&local->iflist_mtx);
1593         }
1594
1595         /*
1596          * Push the beacon loss detection into the future since
1597          * we are processing a beacon from the AP just now.
1598          */
1599         mod_beacon_timer(sdata);
1600
1601         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1602         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1603                                           len - baselen, &elems,
1604                                           care_about_ies, ncrc);
1605
1606         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1607                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1608                                                    ifmgd->aid);
1609
1610         if (ncrc != ifmgd->beacon_crc) {
1611                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1612                                       true);
1613
1614                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1615                                          elems.wmm_param_len);
1616         }
1617
1618         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1619                 if (directed_tim) {
1620                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1621                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1622                                 ieee80211_hw_config(local,
1623                                                     IEEE80211_CONF_CHANGE_PS);
1624                                 ieee80211_send_nullfunc(local, sdata, 0);
1625                         } else {
1626                                 local->pspolling = true;
1627
1628                                 /*
1629                                  * Here is assumed that the driver will be
1630                                  * able to send ps-poll frame and receive a
1631                                  * response even though power save mode is
1632                                  * enabled, but some drivers might require
1633                                  * to disable power save here. This needs
1634                                  * to be investigated.
1635                                  */
1636                                 ieee80211_send_pspoll(local, sdata);
1637                         }
1638                 }
1639         }
1640
1641         if (ncrc == ifmgd->beacon_crc)
1642                 return;
1643         ifmgd->beacon_crc = ncrc;
1644
1645         if (elems.erp_info && elems.erp_info_len >= 1) {
1646                 erp_valid = true;
1647                 erp_value = elems.erp_info[0];
1648         } else {
1649                 erp_valid = false;
1650         }
1651         changed |= ieee80211_handle_bss_capability(sdata,
1652                         le16_to_cpu(mgmt->u.beacon.capab_info),
1653                         erp_valid, erp_value);
1654
1655
1656         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1657             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1658                 struct sta_info *sta;
1659                 struct ieee80211_supported_band *sband;
1660                 u16 ap_ht_cap_flags;
1661
1662                 rcu_read_lock();
1663
1664                 sta = sta_info_get(sdata, bssid);
1665                 if (WARN_ON(!sta)) {
1666                         rcu_read_unlock();
1667                         return;
1668                 }
1669
1670                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1671
1672                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1673                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1674
1675                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1676
1677                 rcu_read_unlock();
1678
1679                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1680                                                bssid, ap_ht_cap_flags);
1681         }
1682
1683         /* Note: country IE parsing is done for us by cfg80211 */
1684         if (elems.country_elem) {
1685                 /* TODO: IBSS also needs this */
1686                 if (elems.pwr_constr_elem)
1687                         ieee80211_handle_pwr_constr(sdata,
1688                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1689                                 elems.pwr_constr_elem,
1690                                 elems.pwr_constr_elem_len);
1691         }
1692
1693         ieee80211_bss_info_change_notify(sdata, changed);
1694 }
1695
1696 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1697                                   struct sk_buff *skb)
1698 {
1699         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1700         struct ieee80211_rx_status *rx_status;
1701         struct ieee80211_mgmt *mgmt;
1702         enum rx_mgmt_action rma = RX_MGMT_NONE;
1703         u16 fc;
1704
1705         rx_status = (struct ieee80211_rx_status *) skb->cb;
1706         mgmt = (struct ieee80211_mgmt *) skb->data;
1707         fc = le16_to_cpu(mgmt->frame_control);
1708
1709         mutex_lock(&ifmgd->mtx);
1710
1711         if (ifmgd->associated &&
1712             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1713                 switch (fc & IEEE80211_FCTL_STYPE) {
1714                 case IEEE80211_STYPE_BEACON:
1715                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1716                                                  rx_status);
1717                         break;
1718                 case IEEE80211_STYPE_PROBE_RESP:
1719                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1720                         break;
1721                 case IEEE80211_STYPE_DEAUTH:
1722                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1723                         break;
1724                 case IEEE80211_STYPE_DISASSOC:
1725                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1726                         break;
1727                 case IEEE80211_STYPE_ACTION:
1728                         switch (mgmt->u.action.category) {
1729                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1730                                 ieee80211_sta_process_chanswitch(sdata,
1731                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1732                                                 (void *)ifmgd->associated->priv,
1733                                                 rx_status->mactime);
1734                                 break;
1735                         }
1736                 }
1737                 mutex_unlock(&ifmgd->mtx);
1738
1739                 switch (rma) {
1740                 case RX_MGMT_NONE:
1741                         /* no action */
1742                         break;
1743                 case RX_MGMT_CFG80211_DEAUTH:
1744                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1745                         break;
1746                 case RX_MGMT_CFG80211_DISASSOC:
1747                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1748                         break;
1749                 default:
1750                         WARN(1, "unexpected: %d", rma);
1751                 }
1752                 return;
1753         }
1754
1755         mutex_unlock(&ifmgd->mtx);
1756
1757         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1758             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1759                 struct ieee80211_local *local = sdata->local;
1760                 struct ieee80211_work *wk;
1761
1762                 mutex_lock(&local->mtx);
1763                 list_for_each_entry(wk, &local->work_list, list) {
1764                         if (wk->sdata != sdata)
1765                                 continue;
1766
1767                         if (wk->type != IEEE80211_WORK_ASSOC &&
1768                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1769                                 continue;
1770
1771                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1772                                 continue;
1773                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1774                                 continue;
1775
1776                         /*
1777                          * Printing the message only here means we can't
1778                          * spuriously print it, but it also means that it
1779                          * won't be printed when the frame comes in before
1780                          * we even tried to associate or in similar cases.
1781                          *
1782                          * Ultimately, I suspect cfg80211 should print the
1783                          * messages instead.
1784                          */
1785                         printk(KERN_DEBUG
1786                                "%s: deauthenticated from %pM (Reason: %u)\n",
1787                                sdata->name, mgmt->bssid,
1788                                le16_to_cpu(mgmt->u.deauth.reason_code));
1789
1790                         list_del_rcu(&wk->list);
1791                         free_work(wk);
1792                         break;
1793                 }
1794                 mutex_unlock(&local->mtx);
1795
1796                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1797         }
1798 }
1799
1800 static void ieee80211_sta_timer(unsigned long data)
1801 {
1802         struct ieee80211_sub_if_data *sdata =
1803                 (struct ieee80211_sub_if_data *) data;
1804         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1805         struct ieee80211_local *local = sdata->local;
1806
1807         if (local->quiescing) {
1808                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1809                 return;
1810         }
1811
1812         ieee80211_queue_work(&local->hw, &sdata->work);
1813 }
1814
1815 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
1816 {
1817         struct ieee80211_local *local = sdata->local;
1818         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1819
1820         /* then process the rest of the work */
1821         mutex_lock(&ifmgd->mtx);
1822
1823         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1824                             IEEE80211_STA_CONNECTION_POLL) &&
1825             ifmgd->associated) {
1826                 u8 bssid[ETH_ALEN];
1827
1828                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1829                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1830                         run_again(ifmgd, ifmgd->probe_timeout);
1831
1832                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1833 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1834                         printk(KERN_DEBUG "No probe response from AP %pM"
1835                                 " after %dms, try %d\n", bssid,
1836                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1837                                 ifmgd->probe_send_count);
1838 #endif
1839                         ieee80211_mgd_probe_ap_send(sdata);
1840                 } else {
1841                         /*
1842                          * We actually lost the connection ... or did we?
1843                          * Let's make sure!
1844                          */
1845                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1846                                           IEEE80211_STA_BEACON_POLL);
1847                         printk(KERN_DEBUG "No probe response from AP %pM"
1848                                 " after %dms, disconnecting.\n",
1849                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1850                         ieee80211_set_disassoc(sdata, true);
1851                         mutex_unlock(&ifmgd->mtx);
1852                         mutex_lock(&local->mtx);
1853                         ieee80211_recalc_idle(local);
1854                         mutex_unlock(&local->mtx);
1855                         /*
1856                          * must be outside lock due to cfg80211,
1857                          * but that's not a problem.
1858                          */
1859                         ieee80211_send_deauth_disassoc(sdata, bssid,
1860                                         IEEE80211_STYPE_DEAUTH,
1861                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1862                                         NULL, true);
1863                         mutex_lock(&ifmgd->mtx);
1864                 }
1865         }
1866
1867         mutex_unlock(&ifmgd->mtx);
1868 }
1869
1870 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1871 {
1872         struct ieee80211_sub_if_data *sdata =
1873                 (struct ieee80211_sub_if_data *) data;
1874         struct ieee80211_local *local = sdata->local;
1875
1876         if (local->quiescing)
1877                 return;
1878
1879         ieee80211_queue_work(&sdata->local->hw,
1880                              &sdata->u.mgd.beacon_connection_loss_work);
1881 }
1882
1883 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1884 {
1885         struct ieee80211_sub_if_data *sdata =
1886                 (struct ieee80211_sub_if_data *) data;
1887         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1888         struct ieee80211_local *local = sdata->local;
1889
1890         if (local->quiescing)
1891                 return;
1892
1893         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1894 }
1895
1896 static void ieee80211_sta_monitor_work(struct work_struct *work)
1897 {
1898         struct ieee80211_sub_if_data *sdata =
1899                 container_of(work, struct ieee80211_sub_if_data,
1900                              u.mgd.monitor_work);
1901
1902         ieee80211_mgd_probe_ap(sdata, false);
1903 }
1904
1905 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1906 {
1907         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1908                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1909                                         IEEE80211_STA_CONNECTION_POLL);
1910
1911                 /* let's probe the connection once */
1912                 ieee80211_queue_work(&sdata->local->hw,
1913                            &sdata->u.mgd.monitor_work);
1914                 /* and do all the other regular work too */
1915                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1916         }
1917 }
1918
1919 #ifdef CONFIG_PM
1920 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1921 {
1922         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1923
1924         /*
1925          * we need to use atomic bitops for the running bits
1926          * only because both timers might fire at the same
1927          * time -- the code here is properly synchronised.
1928          */
1929
1930         cancel_work_sync(&ifmgd->request_smps_work);
1931
1932         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1933         if (del_timer_sync(&ifmgd->timer))
1934                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1935
1936         cancel_work_sync(&ifmgd->chswitch_work);
1937         if (del_timer_sync(&ifmgd->chswitch_timer))
1938                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1939
1940         cancel_work_sync(&ifmgd->monitor_work);
1941         /* these will just be re-established on connection */
1942         del_timer_sync(&ifmgd->conn_mon_timer);
1943         del_timer_sync(&ifmgd->bcn_mon_timer);
1944 }
1945
1946 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1947 {
1948         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1949
1950         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1951                 add_timer(&ifmgd->timer);
1952         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1953                 add_timer(&ifmgd->chswitch_timer);
1954 }
1955 #endif
1956
1957 /* interface setup */
1958 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1959 {
1960         struct ieee80211_if_managed *ifmgd;
1961
1962         ifmgd = &sdata->u.mgd;
1963         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1964         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1965         INIT_WORK(&ifmgd->beacon_connection_loss_work,
1966                   ieee80211_beacon_connection_loss_work);
1967         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
1968         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1969                     (unsigned long) sdata);
1970         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1971                     (unsigned long) sdata);
1972         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1973                     (unsigned long) sdata);
1974         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1975                     (unsigned long) sdata);
1976
1977         ifmgd->flags = 0;
1978
1979         mutex_init(&ifmgd->mtx);
1980
1981         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1982                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1983         else
1984                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1985 }
1986
1987 /* scan finished notification */
1988 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1989 {
1990         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1991
1992         /* Restart STA timers */
1993         rcu_read_lock();
1994         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1995                 ieee80211_restart_sta_timer(sdata);
1996         rcu_read_unlock();
1997 }
1998
1999 int ieee80211_max_network_latency(struct notifier_block *nb,
2000                                   unsigned long data, void *dummy)
2001 {
2002         s32 latency_usec = (s32) data;
2003         struct ieee80211_local *local =
2004                 container_of(nb, struct ieee80211_local,
2005                              network_latency_notifier);
2006
2007         mutex_lock(&local->iflist_mtx);
2008         ieee80211_recalc_ps(local, latency_usec);
2009         mutex_unlock(&local->iflist_mtx);
2010
2011         return 0;
2012 }
2013
2014 /* config hooks */
2015 static enum work_done_result
2016 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2017                           struct sk_buff *skb)
2018 {
2019         if (!skb) {
2020                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2021                 return WORK_DONE_DESTROY;
2022         }
2023
2024         if (wk->type == IEEE80211_WORK_AUTH) {
2025                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2026                 return WORK_DONE_DESTROY;
2027         }
2028
2029         mutex_lock(&wk->sdata->u.mgd.mtx);
2030         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2031         mutex_unlock(&wk->sdata->u.mgd.mtx);
2032
2033         wk->type = IEEE80211_WORK_AUTH;
2034         wk->probe_auth.tries = 0;
2035         return WORK_DONE_REQUEUE;
2036 }
2037
2038 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2039                        struct cfg80211_auth_request *req)
2040 {
2041         const u8 *ssid;
2042         struct ieee80211_work *wk;
2043         u16 auth_alg;
2044
2045         if (req->local_state_change)
2046                 return 0; /* no need to update mac80211 state */
2047
2048         switch (req->auth_type) {
2049         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2050                 auth_alg = WLAN_AUTH_OPEN;
2051                 break;
2052         case NL80211_AUTHTYPE_SHARED_KEY:
2053                 if (IS_ERR(sdata->local->wep_tx_tfm))
2054                         return -EOPNOTSUPP;
2055                 auth_alg = WLAN_AUTH_SHARED_KEY;
2056                 break;
2057         case NL80211_AUTHTYPE_FT:
2058                 auth_alg = WLAN_AUTH_FT;
2059                 break;
2060         case NL80211_AUTHTYPE_NETWORK_EAP:
2061                 auth_alg = WLAN_AUTH_LEAP;
2062                 break;
2063         default:
2064                 return -EOPNOTSUPP;
2065         }
2066
2067         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2068         if (!wk)
2069                 return -ENOMEM;
2070
2071         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2072
2073         if (req->ie && req->ie_len) {
2074                 memcpy(wk->ie, req->ie, req->ie_len);
2075                 wk->ie_len = req->ie_len;
2076         }
2077
2078         if (req->key && req->key_len) {
2079                 wk->probe_auth.key_len = req->key_len;
2080                 wk->probe_auth.key_idx = req->key_idx;
2081                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2082         }
2083
2084         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2085         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2086         wk->probe_auth.ssid_len = ssid[1];
2087
2088         wk->probe_auth.algorithm = auth_alg;
2089         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2090
2091         /* if we already have a probe, don't probe again */
2092         if (req->bss->proberesp_ies)
2093                 wk->type = IEEE80211_WORK_AUTH;
2094         else
2095                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2096         wk->chan = req->bss->channel;
2097         wk->sdata = sdata;
2098         wk->done = ieee80211_probe_auth_done;
2099
2100         ieee80211_add_work(wk);
2101         return 0;
2102 }
2103
2104 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2105                                                   struct sk_buff *skb)
2106 {
2107         struct ieee80211_mgmt *mgmt;
2108         struct ieee80211_rx_status *rx_status;
2109         struct ieee802_11_elems elems;
2110         u16 status;
2111
2112         if (!skb) {
2113                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2114                 return WORK_DONE_DESTROY;
2115         }
2116
2117         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2118                 mutex_lock(&wk->sdata->u.mgd.mtx);
2119                 rx_status = (void *) skb->cb;
2120                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2121                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2122                                       &elems, true);
2123                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2124
2125                 wk->type = IEEE80211_WORK_ASSOC;
2126                 /* not really done yet */
2127                 return WORK_DONE_REQUEUE;
2128         }
2129
2130         mgmt = (void *)skb->data;
2131         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2132
2133         if (status == WLAN_STATUS_SUCCESS) {
2134                 mutex_lock(&wk->sdata->u.mgd.mtx);
2135                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2136                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2137                         /* oops -- internal error -- send timeout for now */
2138                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2139                                                     wk->filter_ta);
2140                         return WORK_DONE_DESTROY;
2141                 }
2142
2143                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2144         }
2145
2146         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2147         return WORK_DONE_DESTROY;
2148 }
2149
2150 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2151                         struct cfg80211_assoc_request *req)
2152 {
2153         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2154         struct ieee80211_bss *bss = (void *)req->bss->priv;
2155         struct ieee80211_work *wk;
2156         const u8 *ssid;
2157         int i;
2158
2159         mutex_lock(&ifmgd->mtx);
2160         if (ifmgd->associated) {
2161                 if (!req->prev_bssid ||
2162                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2163                            ETH_ALEN)) {
2164                         /*
2165                          * We are already associated and the request was not a
2166                          * reassociation request from the current BSS, so
2167                          * reject it.
2168                          */
2169                         mutex_unlock(&ifmgd->mtx);
2170                         return -EALREADY;
2171                 }
2172
2173                 /* Trying to reassociate - clear previous association state */
2174                 ieee80211_set_disassoc(sdata, true);
2175         }
2176         mutex_unlock(&ifmgd->mtx);
2177
2178         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2179         if (!wk)
2180                 return -ENOMEM;
2181
2182         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2183         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2184
2185         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2186                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2187                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2188                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2189                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2190
2191
2192         if (req->ie && req->ie_len) {
2193                 memcpy(wk->ie, req->ie, req->ie_len);
2194                 wk->ie_len = req->ie_len;
2195         } else
2196                 wk->ie_len = 0;
2197
2198         wk->assoc.bss = req->bss;
2199
2200         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2201
2202         /* new association always uses requested smps mode */
2203         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2204                 if (ifmgd->powersave)
2205                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2206                 else
2207                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2208         } else
2209                 ifmgd->ap_smps = ifmgd->req_smps;
2210
2211         wk->assoc.smps = ifmgd->ap_smps;
2212         /*
2213          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2214          * We still associate in non-HT mode (11a/b/g) if any one of these
2215          * ciphers is configured as pairwise.
2216          * We can set this to true for non-11n hardware, that'll be checked
2217          * separately along with the peer capabilities.
2218          */
2219         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2220         wk->assoc.capability = req->bss->capability;
2221         wk->assoc.wmm_used = bss->wmm_used;
2222         wk->assoc.supp_rates = bss->supp_rates;
2223         wk->assoc.supp_rates_len = bss->supp_rates_len;
2224         wk->assoc.ht_information_ie =
2225                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2226
2227         if (bss->wmm_used && bss->uapsd_supported &&
2228             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2229                 wk->assoc.uapsd_used = true;
2230                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2231         } else {
2232                 wk->assoc.uapsd_used = false;
2233                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2234         }
2235
2236         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2237         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2238         wk->assoc.ssid_len = ssid[1];
2239
2240         if (req->prev_bssid)
2241                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2242
2243         wk->chan = req->bss->channel;
2244         wk->sdata = sdata;
2245         wk->done = ieee80211_assoc_done;
2246         if (!bss->dtim_period &&
2247             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2248                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2249         else
2250                 wk->type = IEEE80211_WORK_ASSOC;
2251
2252         if (req->use_mfp) {
2253                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2254                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2255         } else {
2256                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2257                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2258         }
2259
2260         if (req->crypto.control_port)
2261                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2262         else
2263                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2264
2265         ieee80211_add_work(wk);
2266         return 0;
2267 }
2268
2269 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2270                          struct cfg80211_deauth_request *req,
2271                          void *cookie)
2272 {
2273         struct ieee80211_local *local = sdata->local;
2274         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2275         struct ieee80211_work *wk;
2276         u8 bssid[ETH_ALEN];
2277         bool assoc_bss = false;
2278
2279         mutex_lock(&ifmgd->mtx);
2280
2281         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2282         if (ifmgd->associated == req->bss) {
2283                 ieee80211_set_disassoc(sdata, false);
2284                 mutex_unlock(&ifmgd->mtx);
2285                 assoc_bss = true;
2286         } else {
2287                 bool not_auth_yet = false;
2288
2289                 mutex_unlock(&ifmgd->mtx);
2290
2291                 mutex_lock(&local->mtx);
2292                 list_for_each_entry(wk, &local->work_list, list) {
2293                         if (wk->sdata != sdata)
2294                                 continue;
2295
2296                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2297                             wk->type != IEEE80211_WORK_AUTH &&
2298                             wk->type != IEEE80211_WORK_ASSOC &&
2299                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2300                                 continue;
2301
2302                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2303                                 continue;
2304
2305                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2306                         list_del_rcu(&wk->list);
2307                         free_work(wk);
2308                         break;
2309                 }
2310                 mutex_unlock(&local->mtx);
2311
2312                 /*
2313                  * If somebody requests authentication and we haven't
2314                  * sent out an auth frame yet there's no need to send
2315                  * out a deauth frame either. If the state was PROBE,
2316                  * then this is the case. If it's AUTH we have sent a
2317                  * frame, and if it's IDLE we have completed the auth
2318                  * process already.
2319                  */
2320                 if (not_auth_yet) {
2321                         __cfg80211_auth_canceled(sdata->dev, bssid);
2322                         return 0;
2323                 }
2324         }
2325
2326         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2327                sdata->name, bssid, req->reason_code);
2328
2329         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2330                                        req->reason_code, cookie,
2331                                        !req->local_state_change);
2332         if (assoc_bss)
2333                 sta_info_destroy_addr(sdata, bssid);
2334
2335         mutex_lock(&sdata->local->mtx);
2336         ieee80211_recalc_idle(sdata->local);
2337         mutex_unlock(&sdata->local->mtx);
2338
2339         return 0;
2340 }
2341
2342 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2343                            struct cfg80211_disassoc_request *req,
2344                            void *cookie)
2345 {
2346         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2347         u8 bssid[ETH_ALEN];
2348
2349         mutex_lock(&ifmgd->mtx);
2350
2351         /*
2352          * cfg80211 should catch this ... but it's racy since
2353          * we can receive a disassoc frame, process it, hand it
2354          * to cfg80211 while that's in a locked section already
2355          * trying to tell us that the user wants to disconnect.
2356          */
2357         if (ifmgd->associated != req->bss) {
2358                 mutex_unlock(&ifmgd->mtx);
2359                 return -ENOLINK;
2360         }
2361
2362         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2363                sdata->name, req->bss->bssid, req->reason_code);
2364
2365         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2366         ieee80211_set_disassoc(sdata, false);
2367
2368         mutex_unlock(&ifmgd->mtx);
2369
2370         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2371                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2372                         cookie, !req->local_state_change);
2373         sta_info_destroy_addr(sdata, bssid);
2374
2375         mutex_lock(&sdata->local->mtx);
2376         ieee80211_recalc_idle(sdata->local);
2377         mutex_unlock(&sdata->local->mtx);
2378
2379         return 0;
2380 }
2381
2382 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2383                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2384                                gfp_t gfp)
2385 {
2386         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2387
2388         trace_api_cqm_rssi_notify(sdata, rssi_event);
2389
2390         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2391 }
2392 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);