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_if_managed *ifmgd,
 702                                      u8 *wmm_param, size_t wmm_param_len)
 703 {
 704         struct ieee80211_tx_queue_params params;
 705         size_t left;
 706         int count;
 707         u8 *pos, uapsd_queues = 0;
 708
 709         if (!local->ops->conf_tx)
 710                 return;
 711
 712         if (local->hw.queues < 4)
 713                 return;
 714
 715         if (!wmm_param)
 716                 return;
 717
 718         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 719                 return;
 720
 721         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 722                 uapsd_queues = local->uapsd_queues;
 723
 724         count = wmm_param[6] & 0x0f;
 725         if (count == ifmgd->wmm_last_param_set)
 726                 return;
 727         ifmgd->wmm_last_param_set = count;
 728
 729         pos = wmm_param + 8;
 730         left = wmm_param_len - 8;
 731
 732         memset(&params, 0, sizeof(params));
 733
 734         local->wmm_acm = 0;
 735         for (; left >= 4; left -= 4, pos += 4) {
 736                 int aci = (pos[0] >> 5) & 0x03;
 737                 int acm = (pos[0] >> 4) & 0x01;
 738                 bool uapsd = false;
 739                 int queue;
 740
 741                 switch (aci) {
 742                 case 1: /* AC_BK */
 743                         queue = 3;
 744                         if (acm)
 745                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 746                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 747                                 uapsd = true;
 748                         break;
 749                 case 2: /* AC_VI */
 750                         queue = 1;
 751                         if (acm)
 752                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 753                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 754                                 uapsd = true;
 755                         break;
 756                 case 3: /* AC_VO */
 757                         queue = 0;
 758                         if (acm)
 759                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 760                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 761                                 uapsd = true;
 762                         break;
 763                 case 0: /* AC_BE */
 764                 default:
 765                         queue = 2;
 766                         if (acm)
 767                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 768                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 769                                 uapsd = true;
 770                         break;
 771                 }
 772
 773                 params.aifs = pos[0] & 0x0f;
 774                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 775                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 776                 params.txop = get_unaligned_le16(pos + 2);
 777                 params.uapsd = uapsd;
 778
 779 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 780                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 781                        "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 782                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 783                        params.aifs, params.cw_min, params.cw_max, params.txop,
 784                        params.uapsd);
 785 #endif
 786                 if (drv_conf_tx(local, queue, &params))
 787                         printk(KERN_DEBUG "%s: failed to set TX queue "
 788                                "parameters for queue %d\n",
 789                                wiphy_name(local->hw.wiphy), queue);
 790         }
 791
 792         /* enable WMM or activate new settings */
 793         local->hw.conf.flags |= IEEE80211_CONF_QOS;
 794         drv_config(local, IEEE80211_CONF_CHANGE_QOS);
 795 }
 796
 797 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 798                                            u16 capab, bool erp_valid, u8 erp)
 799 {
 800         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 801         u32 changed = 0;
 802         bool use_protection;
 803         bool use_short_preamble;
 804         bool use_short_slot;
 805
 806         if (erp_valid) {
 807                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 808                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 809         } else {
 810                 use_protection = false;
 811                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 812         }
 813
 814         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 815         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 816                 use_short_slot = true;
 817
 818         if (use_protection != bss_conf->use_cts_prot) {
 819                 bss_conf->use_cts_prot = use_protection;
 820                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 821         }
 822
 823         if (use_short_preamble != bss_conf->use_short_preamble) {
 824                 bss_conf->use_short_preamble = use_short_preamble;
 825                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 826         }
 827
 828         if (use_short_slot != bss_conf->use_short_slot) {
 829                 bss_conf->use_short_slot = use_short_slot;
 830                 changed |= BSS_CHANGED_ERP_SLOT;
 831         }
 832
 833         return changed;
 834 }
 835
 836 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 837                                      struct cfg80211_bss *cbss,
 838                                      u32 bss_info_changed)
 839 {
 840         struct ieee80211_bss *bss = (void *)cbss->priv;
 841         struct ieee80211_local *local = sdata->local;
 842         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 843
 844         bss_info_changed |= BSS_CHANGED_ASSOC;
 845         /* set timing information */
 846         bss_conf->beacon_int = cbss->beacon_interval;
 847         bss_conf->timestamp = cbss->tsf;
 848
 849         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 850         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 851                 cbss->capability, bss->has_erp_value, bss->erp_value);
 852
 853         sdata->u.mgd.associated = cbss;
 854         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 855
 856         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 857
 858         /* just to be sure */
 859         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 860                                 IEEE80211_STA_BEACON_POLL);
 861
 862         /*
 863          * Always handle WMM once after association regardless
 864          * of the first value the AP uses. Setting -1 here has
 865          * that effect because the AP values is an unsigned
 866          * 4-bit value.
 867          */
 868         sdata->u.mgd.wmm_last_param_set = -1;
 869
 870         ieee80211_led_assoc(local, 1);
 871
 872         bss_conf->assoc = 1;
 873         /*
 874          * For now just always ask the driver to update the basic rateset
 875          * when we have associated, we aren't checking whether it actually
 876          * changed or not.
 877          */
 878         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 879
 880         /* And the BSSID changed - we're associated now */
 881         bss_info_changed |= BSS_CHANGED_BSSID;
 882
 883         /* Tell the driver to monitor connection quality (if supported) */
 884         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 885             bss_conf->cqm_rssi_thold)
 886                 bss_info_changed |= BSS_CHANGED_CQM;
 887
 888         /* Enable ARP filtering */
 889         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
 890                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 891                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
 892         }
 893
 894         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 895
 896         mutex_lock(&local->iflist_mtx);
 897         ieee80211_recalc_ps(local, -1);
 898         ieee80211_recalc_smps(local, sdata);
 899         mutex_unlock(&local->iflist_mtx);
 900
 901         netif_tx_start_all_queues(sdata->dev);
 902         netif_carrier_on(sdata->dev);
 903 }
 904
 905 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 906                                    bool remove_sta)
 907 {
 908         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 909         struct ieee80211_local *local = sdata->local;
 910         struct sta_info *sta;
 911         u32 changed = 0, config_changed = 0;
 912         u8 bssid[ETH_ALEN];
 913
 914         ASSERT_MGD_MTX(ifmgd);
 915
 916         if (WARN_ON(!ifmgd->associated))
 917                 return;
 918
 919         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 920
 921         ifmgd->associated = NULL;
 922         memset(ifmgd->bssid, 0, ETH_ALEN);
 923
 924         /*
 925          * we need to commit the associated = NULL change because the
 926          * scan code uses that to determine whether this iface should
 927          * go to/wake up from powersave or not -- and could otherwise
 928          * wake the queues erroneously.
 929          */
 930         smp_mb();
 931
 932         /*
 933          * Thus, we can only afterwards stop the queues -- to account
 934          * for the case where another CPU is finishing a scan at this
 935          * time -- we don't want the scan code to enable queues.
 936          */
 937
 938         netif_tx_stop_all_queues(sdata->dev);
 939         netif_carrier_off(sdata->dev);
 940
 941         mutex_lock(&local->sta_mtx);
 942         sta = sta_info_get(sdata, bssid);
 943         if (sta) {
 944                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
 945                 ieee80211_sta_tear_down_BA_sessions(sta);
 946         }
 947         mutex_unlock(&local->sta_mtx);
 948
 949         changed |= ieee80211_reset_erp_info(sdata);
 950
 951         ieee80211_led_assoc(local, 0);
 952         changed |= BSS_CHANGED_ASSOC;
 953         sdata->vif.bss_conf.assoc = false;
 954
 955         ieee80211_set_wmm_default(sdata);
 956
 957         /* channel(_type) changes are handled by ieee80211_hw_config */
 958         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
 959
 960         /* on the next assoc, re-program HT parameters */
 961         sdata->ht_opmode_valid = false;
 962
 963         local->power_constr_level = 0;
 964
 965         del_timer_sync(&local->dynamic_ps_timer);
 966         cancel_work_sync(&local->dynamic_ps_enable_work);
 967
 968         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 969                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 970                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 971         }
 972
 973         ieee80211_hw_config(local, config_changed);
 974
 975         /* Disable ARP filtering */
 976         if (sdata->vif.bss_conf.arp_filter_enabled) {
 977                 sdata->vif.bss_conf.arp_filter_enabled = false;
 978                 changed |= BSS_CHANGED_ARP_FILTER;
 979         }
 980
 981         /* The BSSID (not really interesting) and HT changed */
 982         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
 983         ieee80211_bss_info_change_notify(sdata, changed);
 984
 985         if (remove_sta)
 986                 sta_info_destroy_addr(sdata, bssid);
 987 }
 988
 989 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 990                              struct ieee80211_hdr *hdr)
 991 {
 992         /*
 993          * We can postpone the mgd.timer whenever receiving unicast frames
 994          * from AP because we know that the connection is working both ways
 995          * at that time. But multicast frames (and hence also beacons) must
 996          * be ignored here, because we need to trigger the timer during
 997          * data idle periods for sending the periodic probe request to the
 998          * AP we're connected to.
 999          */
1000         if (is_multicast_ether_addr(hdr->addr1))
1001                 return;
1002
1003         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1004                 return;
1005
1006         mod_timer(&sdata->u.mgd.conn_mon_timer,
1007                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1008 }
1009
1010 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1011 {
1012         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1013         const u8 *ssid;
1014
1015         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1016         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
1017                                  ssid + 2, ssid[1], NULL, 0);
1018
1019         ifmgd->probe_send_count++;
1020         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1021         run_again(ifmgd, ifmgd->probe_timeout);
1022 }
1023
1024 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1025                                    bool beacon)
1026 {
1027         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1028         bool already = false;
1029
1030         if (!ieee80211_sdata_running(sdata))
1031                 return;
1032
1033         if (sdata->local->scanning)
1034                 return;
1035
1036         if (sdata->local->tmp_channel)
1037                 return;
1038
1039         mutex_lock(&ifmgd->mtx);
1040
1041         if (!ifmgd->associated)
1042                 goto out;
1043
1044 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1045         if (beacon && net_ratelimit())
1046                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1047                        "- sending probe request\n", sdata->name);
1048 #endif
1049
1050         /*
1051          * The driver/our work has already reported this event or the
1052          * connection monitoring has kicked in and we have already sent
1053          * a probe request. Or maybe the AP died and the driver keeps
1054          * reporting until we disassociate...
1055          *
1056          * In either case we have to ignore the current call to this
1057          * function (except for setting the correct probe reason bit)
1058          * because otherwise we would reset the timer every time and
1059          * never check whether we received a probe response!
1060          */
1061         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1062                             IEEE80211_STA_CONNECTION_POLL))
1063                 already = true;
1064
1065         if (beacon)
1066                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1067         else
1068                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1069
1070         if (already)
1071                 goto out;
1072
1073         mutex_lock(&sdata->local->iflist_mtx);
1074         ieee80211_recalc_ps(sdata->local, -1);
1075         mutex_unlock(&sdata->local->iflist_mtx);
1076
1077         ifmgd->probe_send_count = 0;
1078         ieee80211_mgd_probe_ap_send(sdata);
1079  out:
1080         mutex_unlock(&ifmgd->mtx);
1081 }
1082
1083 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1084 {
1085         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1086         struct ieee80211_local *local = sdata->local;
1087         u8 bssid[ETH_ALEN];
1088
1089         mutex_lock(&ifmgd->mtx);
1090         if (!ifmgd->associated) {
1091                 mutex_unlock(&ifmgd->mtx);
1092                 return;
1093         }
1094
1095         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1096
1097         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1098
1099         ieee80211_set_disassoc(sdata, true);
1100         ieee80211_recalc_idle(local);
1101         mutex_unlock(&ifmgd->mtx);
1102         /*
1103          * must be outside lock due to cfg80211,
1104          * but that's not a problem.
1105          */
1106         ieee80211_send_deauth_disassoc(sdata, bssid,
1107                                        IEEE80211_STYPE_DEAUTH,
1108                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1109                                        NULL, true);
1110 }
1111
1112 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1113 {
1114         struct ieee80211_sub_if_data *sdata =
1115                 container_of(work, struct ieee80211_sub_if_data,
1116                              u.mgd.beacon_connection_loss_work);
1117
1118         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1119                 __ieee80211_connection_loss(sdata);
1120         else
1121                 ieee80211_mgd_probe_ap(sdata, true);
1122 }
1123
1124 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1125 {
1126         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1127         struct ieee80211_hw *hw = &sdata->local->hw;
1128
1129         trace_api_beacon_loss(sdata);
1130
1131         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1132         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1133 }
1134 EXPORT_SYMBOL(ieee80211_beacon_loss);
1135
1136 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1137 {
1138         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1139         struct ieee80211_hw *hw = &sdata->local->hw;
1140
1141         trace_api_connection_loss(sdata);
1142
1143         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1144         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1145 }
1146 EXPORT_SYMBOL(ieee80211_connection_loss);
1147
1148
1149 static enum rx_mgmt_action __must_check
1150 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1151                          struct ieee80211_mgmt *mgmt, size_t len)
1152 {
1153         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1154         const u8 *bssid = NULL;
1155         u16 reason_code;
1156
1157         if (len < 24 + 2)
1158                 return RX_MGMT_NONE;
1159
1160         ASSERT_MGD_MTX(ifmgd);
1161
1162         bssid = ifmgd->associated->bssid;
1163
1164         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1165
1166         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1167                         sdata->name, bssid, reason_code);
1168
1169         ieee80211_set_disassoc(sdata, true);
1170         ieee80211_recalc_idle(sdata->local);
1171
1172         return RX_MGMT_CFG80211_DEAUTH;
1173 }
1174
1175
1176 static enum rx_mgmt_action __must_check
1177 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1178                            struct ieee80211_mgmt *mgmt, size_t len)
1179 {
1180         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1181         u16 reason_code;
1182
1183         if (len < 24 + 2)
1184                 return RX_MGMT_NONE;
1185
1186         ASSERT_MGD_MTX(ifmgd);
1187
1188         if (WARN_ON(!ifmgd->associated))
1189                 return RX_MGMT_NONE;
1190
1191         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1192                 return RX_MGMT_NONE;
1193
1194         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1195
1196         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1197                         sdata->name, mgmt->sa, reason_code);
1198
1199         ieee80211_set_disassoc(sdata, true);
1200         ieee80211_recalc_idle(sdata->local);
1201         return RX_MGMT_CFG80211_DISASSOC;
1202 }
1203
1204
1205 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1206                                     struct ieee80211_mgmt *mgmt, size_t len)
1207 {
1208         struct ieee80211_sub_if_data *sdata = wk->sdata;
1209         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1210         struct ieee80211_local *local = sdata->local;
1211         struct ieee80211_supported_band *sband;
1212         struct sta_info *sta;
1213         struct cfg80211_bss *cbss = wk->assoc.bss;
1214         u8 *pos;
1215         u32 rates, basic_rates;
1216         u16 capab_info, aid;
1217         struct ieee802_11_elems elems;
1218         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1219         u32 changed = 0;
1220         int i, j, err;
1221         bool have_higher_than_11mbit = false;
1222         u16 ap_ht_cap_flags;
1223
1224         /* AssocResp and ReassocResp have identical structure */
1225
1226         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1227         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1228
1229         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1230                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1231                        "set\n", sdata->name, aid);
1232         aid &= ~(BIT(15) | BIT(14));
1233
1234         pos = mgmt->u.assoc_resp.variable;
1235         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1236
1237         if (!elems.supp_rates) {
1238                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1239                        sdata->name);
1240                 return false;
1241         }
1242
1243         ifmgd->aid = aid;
1244
1245         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1246         if (!sta) {
1247                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1248                        " the AP\n", sdata->name);
1249                 return false;
1250         }
1251
1252         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1253                            WLAN_STA_ASSOC_AP);
1254         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1255                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1256
1257         rates = 0;
1258         basic_rates = 0;
1259         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1260
1261         for (i = 0; i < elems.supp_rates_len; i++) {
1262                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1263                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1264
1265                 if (rate > 110)
1266                         have_higher_than_11mbit = true;
1267
1268                 for (j = 0; j < sband->n_bitrates; j++) {
1269                         if (sband->bitrates[j].bitrate == rate) {
1270                                 rates |= BIT(j);
1271                                 if (is_basic)
1272                                         basic_rates |= BIT(j);
1273                                 break;
1274                         }
1275                 }
1276         }
1277
1278         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1279                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1280                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1281
1282                 if (rate > 110)
1283                         have_higher_than_11mbit = true;
1284
1285                 for (j = 0; j < sband->n_bitrates; j++) {
1286                         if (sband->bitrates[j].bitrate == rate) {
1287                                 rates |= BIT(j);
1288                                 if (is_basic)
1289                                         basic_rates |= BIT(j);
1290                                 break;
1291                         }
1292                 }
1293         }
1294
1295         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1296         sdata->vif.bss_conf.basic_rates = basic_rates;
1297
1298         /* cf. IEEE 802.11 9.2.12 */
1299         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1300             have_higher_than_11mbit)
1301                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1302         else
1303                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1304
1305         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1306                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1307                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1308
1309         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1310
1311         rate_control_rate_init(sta);
1312
1313         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1314                 set_sta_flags(sta, WLAN_STA_MFP);
1315
1316         if (elems.wmm_param)
1317                 set_sta_flags(sta, WLAN_STA_WME);
1318
1319         err = sta_info_insert(sta);
1320         sta = NULL;
1321         if (err) {
1322                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1323                        " the AP (error %d)\n", sdata->name, err);
1324                 return false;
1325         }
1326
1327         if (elems.wmm_param)
1328                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1329                                          elems.wmm_param_len);
1330         else
1331                 ieee80211_set_wmm_default(sdata);
1332
1333         local->oper_channel = wk->chan;
1334
1335         if (elems.ht_info_elem && elems.wmm_param &&
1336             (sdata->local->hw.queues >= 4) &&
1337             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1338                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1339                                                cbss->bssid, ap_ht_cap_flags);
1340
1341         /* set AID and assoc capability,
1342          * ieee80211_set_associated() will tell the driver */
1343         bss_conf->aid = aid;
1344         bss_conf->assoc_capability = capab_info;
1345         ieee80211_set_associated(sdata, cbss, changed);
1346
1347         /*
1348          * If we're using 4-addr mode, let the AP know that we're
1349          * doing so, so that it can create the STA VLAN on its side
1350          */
1351         if (ifmgd->use_4addr)
1352                 ieee80211_send_4addr_nullfunc(local, sdata);
1353
1354         /*
1355          * Start timer to probe the connection to the AP now.
1356          * Also start the timer that will detect beacon loss.
1357          */
1358         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1359         mod_beacon_timer(sdata);
1360
1361         return true;
1362 }
1363
1364
1365 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1366                                   struct ieee80211_mgmt *mgmt,
1367                                   size_t len,
1368                                   struct ieee80211_rx_status *rx_status,
1369                                   struct ieee802_11_elems *elems,
1370                                   bool beacon)
1371 {
1372         struct ieee80211_local *local = sdata->local;
1373         int freq;
1374         struct ieee80211_bss *bss;
1375         struct ieee80211_channel *channel;
1376         bool need_ps = false;
1377
1378         if (sdata->u.mgd.associated) {
1379                 bss = (void *)sdata->u.mgd.associated->priv;
1380                 /* not previously set so we may need to recalc */
1381                 need_ps = !bss->dtim_period;
1382         }
1383
1384         if (elems->ds_params && elems->ds_params_len == 1)
1385                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1386         else
1387                 freq = rx_status->freq;
1388
1389         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1390
1391         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1392                 return;
1393
1394         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1395                                         channel, beacon);
1396         if (bss)
1397                 ieee80211_rx_bss_put(local, bss);
1398
1399         if (!sdata->u.mgd.associated)
1400                 return;
1401
1402         if (need_ps) {
1403                 mutex_lock(&local->iflist_mtx);
1404                 ieee80211_recalc_ps(local, -1);
1405                 mutex_unlock(&local->iflist_mtx);
1406         }
1407
1408         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1409             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1410                                                         ETH_ALEN) == 0)) {
1411                 struct ieee80211_channel_sw_ie *sw_elem =
1412                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1413                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1414                                                  bss, rx_status->mactime);
1415         }
1416 }
1417
1418
1419 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1420                                          struct sk_buff *skb)
1421 {
1422         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1423         struct ieee80211_if_managed *ifmgd;
1424         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1425         size_t baselen, len = skb->len;
1426         struct ieee802_11_elems elems;
1427
1428         ifmgd = &sdata->u.mgd;
1429
1430         ASSERT_MGD_MTX(ifmgd);
1431
1432         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1433                 return; /* ignore ProbeResp to foreign address */
1434
1435         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1436         if (baselen > len)
1437                 return;
1438
1439         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1440                                 &elems);
1441
1442         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1443
1444         if (ifmgd->associated &&
1445             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1446             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1447                             IEEE80211_STA_CONNECTION_POLL)) {
1448                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1449                                   IEEE80211_STA_BEACON_POLL);
1450                 mutex_lock(&sdata->local->iflist_mtx);
1451                 ieee80211_recalc_ps(sdata->local, -1);
1452                 mutex_unlock(&sdata->local->iflist_mtx);
1453
1454                 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1455                         return;
1456
1457                 /*
1458                  * We've received a probe response, but are not sure whether
1459                  * we have or will be receiving any beacons or data, so let's
1460                  * schedule the timers again, just in case.
1461                  */
1462                 mod_beacon_timer(sdata);
1463
1464                 mod_timer(&ifmgd->conn_mon_timer,
1465                           round_jiffies_up(jiffies +
1466                                            IEEE80211_CONNECTION_IDLE_TIME));
1467         }
1468 }
1469
1470 /*
1471  * This is the canonical list of information elements we care about,
1472  * the filter code also gives us all changes to the Microsoft OUI
1473  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1474  *
1475  * We implement beacon filtering in software since that means we can
1476  * avoid processing the frame here and in cfg80211, and userspace
1477  * will not be able to tell whether the hardware supports it or not.
1478  *
1479  * XXX: This list needs to be dynamic -- userspace needs to be able to
1480  *      add items it requires. It also needs to be able to tell us to
1481  *      look out for other vendor IEs.
1482  */
1483 static const u64 care_about_ies =
1484         (1ULL << WLAN_EID_COUNTRY) |
1485         (1ULL << WLAN_EID_ERP_INFO) |
1486         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1487         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1488         (1ULL << WLAN_EID_HT_CAPABILITY) |
1489         (1ULL << WLAN_EID_HT_INFORMATION);
1490
1491 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1492                                      struct ieee80211_mgmt *mgmt,
1493                                      size_t len,
1494                                      struct ieee80211_rx_status *rx_status)
1495 {
1496         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1497         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1498         size_t baselen;
1499         struct ieee802_11_elems elems;
1500         struct ieee80211_local *local = sdata->local;
1501         u32 changed = 0;
1502         bool erp_valid, directed_tim = false;
1503         u8 erp_value = 0;
1504         u32 ncrc;
1505         u8 *bssid;
1506
1507         ASSERT_MGD_MTX(ifmgd);
1508
1509         /* Process beacon from the current BSS */
1510         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1511         if (baselen > len)
1512                 return;
1513
1514         if (rx_status->freq != local->hw.conf.channel->center_freq)
1515                 return;
1516
1517         /*
1518          * We might have received a number of frames, among them a
1519          * disassoc frame and a beacon...
1520          */
1521         if (!ifmgd->associated)
1522                 return;
1523
1524         bssid = ifmgd->associated->bssid;
1525
1526         /*
1527          * And in theory even frames from a different AP we were just
1528          * associated to a split-second ago!
1529          */
1530         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1531                 return;
1532
1533         /* Track average RSSI from the Beacon frames of the current AP */
1534         ifmgd->last_beacon_signal = rx_status->signal;
1535         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1536                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1537                 ifmgd->ave_beacon_signal = rx_status->signal;
1538                 ifmgd->last_cqm_event_signal = 0;
1539         } else {
1540                 ifmgd->ave_beacon_signal =
1541                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1542                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1543                          ifmgd->ave_beacon_signal) / 16;
1544         }
1545         if (bss_conf->cqm_rssi_thold &&
1546             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1547                 int sig = ifmgd->ave_beacon_signal / 16;
1548                 int last_event = ifmgd->last_cqm_event_signal;
1549                 int thold = bss_conf->cqm_rssi_thold;
1550                 int hyst = bss_conf->cqm_rssi_hyst;
1551                 if (sig < thold &&
1552                     (last_event == 0 || sig < last_event - hyst)) {
1553                         ifmgd->last_cqm_event_signal = sig;
1554                         ieee80211_cqm_rssi_notify(
1555                                 &sdata->vif,
1556                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1557                                 GFP_KERNEL);
1558                 } else if (sig > thold &&
1559                            (last_event == 0 || sig > last_event + hyst)) {
1560                         ifmgd->last_cqm_event_signal = sig;
1561                         ieee80211_cqm_rssi_notify(
1562                                 &sdata->vif,
1563                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1564                                 GFP_KERNEL);
1565                 }
1566         }
1567
1568         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1569 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1570                 if (net_ratelimit()) {
1571                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1572                                "to a received beacon\n", sdata->name);
1573                 }
1574 #endif
1575                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1576                 mutex_lock(&local->iflist_mtx);
1577                 ieee80211_recalc_ps(local, -1);
1578                 mutex_unlock(&local->iflist_mtx);
1579         }
1580
1581         /*
1582          * Push the beacon loss detection into the future since
1583          * we are processing a beacon from the AP just now.
1584          */
1585         mod_beacon_timer(sdata);
1586
1587         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1588         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1589                                           len - baselen, &elems,
1590                                           care_about_ies, ncrc);
1591
1592         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1593                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1594                                                    ifmgd->aid);
1595
1596         if (ncrc != ifmgd->beacon_crc) {
1597                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1598                                       true);
1599
1600                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1601                                          elems.wmm_param_len);
1602         }
1603
1604         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1605                 if (directed_tim) {
1606                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1607                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1608                                 ieee80211_hw_config(local,
1609                                                     IEEE80211_CONF_CHANGE_PS);
1610                                 ieee80211_send_nullfunc(local, sdata, 0);
1611                         } else {
1612                                 local->pspolling = true;
1613
1614                                 /*
1615                                  * Here is assumed that the driver will be
1616                                  * able to send ps-poll frame and receive a
1617                                  * response even though power save mode is
1618                                  * enabled, but some drivers might require
1619                                  * to disable power save here. This needs
1620                                  * to be investigated.
1621                                  */
1622                                 ieee80211_send_pspoll(local, sdata);
1623                         }
1624                 }
1625         }
1626
1627         if (ncrc == ifmgd->beacon_crc)
1628                 return;
1629         ifmgd->beacon_crc = ncrc;
1630
1631         if (elems.erp_info && elems.erp_info_len >= 1) {
1632                 erp_valid = true;
1633                 erp_value = elems.erp_info[0];
1634         } else {
1635                 erp_valid = false;
1636         }
1637         changed |= ieee80211_handle_bss_capability(sdata,
1638                         le16_to_cpu(mgmt->u.beacon.capab_info),
1639                         erp_valid, erp_value);
1640
1641
1642         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1643             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1644                 struct sta_info *sta;
1645                 struct ieee80211_supported_band *sband;
1646                 u16 ap_ht_cap_flags;
1647
1648                 rcu_read_lock();
1649
1650                 sta = sta_info_get(sdata, bssid);
1651                 if (WARN_ON(!sta)) {
1652                         rcu_read_unlock();
1653                         return;
1654                 }
1655
1656                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1657
1658                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1659                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1660
1661                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1662
1663                 rcu_read_unlock();
1664
1665                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1666                                                bssid, ap_ht_cap_flags);
1667         }
1668
1669         /* Note: country IE parsing is done for us by cfg80211 */
1670         if (elems.country_elem) {
1671                 /* TODO: IBSS also needs this */
1672                 if (elems.pwr_constr_elem)
1673                         ieee80211_handle_pwr_constr(sdata,
1674                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1675                                 elems.pwr_constr_elem,
1676                                 elems.pwr_constr_elem_len);
1677         }
1678
1679         ieee80211_bss_info_change_notify(sdata, changed);
1680 }
1681
1682 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1683                                   struct sk_buff *skb)
1684 {
1685         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1686         struct ieee80211_rx_status *rx_status;
1687         struct ieee80211_mgmt *mgmt;
1688         enum rx_mgmt_action rma = RX_MGMT_NONE;
1689         u16 fc;
1690
1691         rx_status = (struct ieee80211_rx_status *) skb->cb;
1692         mgmt = (struct ieee80211_mgmt *) skb->data;
1693         fc = le16_to_cpu(mgmt->frame_control);
1694
1695         mutex_lock(&ifmgd->mtx);
1696
1697         if (ifmgd->associated &&
1698             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1699                 switch (fc & IEEE80211_FCTL_STYPE) {
1700                 case IEEE80211_STYPE_BEACON:
1701                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1702                                                  rx_status);
1703                         break;
1704                 case IEEE80211_STYPE_PROBE_RESP:
1705                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1706                         break;
1707                 case IEEE80211_STYPE_DEAUTH:
1708                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1709                         break;
1710                 case IEEE80211_STYPE_DISASSOC:
1711                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1712                         break;
1713                 case IEEE80211_STYPE_ACTION:
1714                         switch (mgmt->u.action.category) {
1715                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1716                                 ieee80211_sta_process_chanswitch(sdata,
1717                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1718                                                 (void *)ifmgd->associated->priv,
1719                                                 rx_status->mactime);
1720                                 break;
1721                         }
1722                 }
1723                 mutex_unlock(&ifmgd->mtx);
1724
1725                 switch (rma) {
1726                 case RX_MGMT_NONE:
1727                         /* no action */
1728                         break;
1729                 case RX_MGMT_CFG80211_DEAUTH:
1730                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1731                         break;
1732                 case RX_MGMT_CFG80211_DISASSOC:
1733                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1734                         break;
1735                 default:
1736                         WARN(1, "unexpected: %d", rma);
1737                 }
1738                 return;
1739         }
1740
1741         mutex_unlock(&ifmgd->mtx);
1742
1743         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1744             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1745                 struct ieee80211_local *local = sdata->local;
1746                 struct ieee80211_work *wk;
1747
1748                 mutex_lock(&local->work_mtx);
1749                 list_for_each_entry(wk, &local->work_list, list) {
1750                         if (wk->sdata != sdata)
1751                                 continue;
1752
1753                         if (wk->type != IEEE80211_WORK_ASSOC)
1754                                 continue;
1755
1756                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1757                                 continue;
1758                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1759                                 continue;
1760
1761                         /*
1762                          * Printing the message only here means we can't
1763                          * spuriously print it, but it also means that it
1764                          * won't be printed when the frame comes in before
1765                          * we even tried to associate or in similar cases.
1766                          *
1767                          * Ultimately, I suspect cfg80211 should print the
1768                          * messages instead.
1769                          */
1770                         printk(KERN_DEBUG
1771                                "%s: deauthenticated from %pM (Reason: %u)\n",
1772                                sdata->name, mgmt->bssid,
1773                                le16_to_cpu(mgmt->u.deauth.reason_code));
1774
1775                         list_del_rcu(&wk->list);
1776                         free_work(wk);
1777                         break;
1778                 }
1779                 mutex_unlock(&local->work_mtx);
1780
1781                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1782         }
1783 }
1784
1785 static void ieee80211_sta_timer(unsigned long data)
1786 {
1787         struct ieee80211_sub_if_data *sdata =
1788                 (struct ieee80211_sub_if_data *) data;
1789         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1790         struct ieee80211_local *local = sdata->local;
1791
1792         if (local->quiescing) {
1793                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1794                 return;
1795         }
1796
1797         ieee80211_queue_work(&local->hw, &sdata->work);
1798 }
1799
1800 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
1801 {
1802         struct ieee80211_local *local = sdata->local;
1803         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1804
1805         /* then process the rest of the work */
1806         mutex_lock(&ifmgd->mtx);
1807
1808         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1809                             IEEE80211_STA_CONNECTION_POLL) &&
1810             ifmgd->associated) {
1811                 u8 bssid[ETH_ALEN];
1812
1813                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1814                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1815                         run_again(ifmgd, ifmgd->probe_timeout);
1816
1817                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1818 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1819                         printk(KERN_DEBUG "No probe response from AP %pM"
1820                                 " after %dms, try %d\n", bssid,
1821                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1822                                 ifmgd->probe_send_count);
1823 #endif
1824                         ieee80211_mgd_probe_ap_send(sdata);
1825                 } else {
1826                         /*
1827                          * We actually lost the connection ... or did we?
1828                          * Let's make sure!
1829                          */
1830                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1831                                           IEEE80211_STA_BEACON_POLL);
1832                         printk(KERN_DEBUG "No probe response from AP %pM"
1833                                 " after %dms, disconnecting.\n",
1834                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1835                         ieee80211_set_disassoc(sdata, true);
1836                         ieee80211_recalc_idle(local);
1837                         mutex_unlock(&ifmgd->mtx);
1838                         /*
1839                          * must be outside lock due to cfg80211,
1840                          * but that's not a problem.
1841                          */
1842                         ieee80211_send_deauth_disassoc(sdata, bssid,
1843                                         IEEE80211_STYPE_DEAUTH,
1844                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1845                                         NULL, true);
1846                         mutex_lock(&ifmgd->mtx);
1847                 }
1848         }
1849
1850         mutex_unlock(&ifmgd->mtx);
1851 }
1852
1853 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1854 {
1855         struct ieee80211_sub_if_data *sdata =
1856                 (struct ieee80211_sub_if_data *) data;
1857         struct ieee80211_local *local = sdata->local;
1858
1859         if (local->quiescing)
1860                 return;
1861
1862         ieee80211_queue_work(&sdata->local->hw,
1863                              &sdata->u.mgd.beacon_connection_loss_work);
1864 }
1865
1866 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1867 {
1868         struct ieee80211_sub_if_data *sdata =
1869                 (struct ieee80211_sub_if_data *) data;
1870         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1871         struct ieee80211_local *local = sdata->local;
1872
1873         if (local->quiescing)
1874                 return;
1875
1876         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1877 }
1878
1879 static void ieee80211_sta_monitor_work(struct work_struct *work)
1880 {
1881         struct ieee80211_sub_if_data *sdata =
1882                 container_of(work, struct ieee80211_sub_if_data,
1883                              u.mgd.monitor_work);
1884
1885         ieee80211_mgd_probe_ap(sdata, false);
1886 }
1887
1888 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1889 {
1890         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1891                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1892                                         IEEE80211_STA_CONNECTION_POLL);
1893
1894                 /* let's probe the connection once */
1895                 ieee80211_queue_work(&sdata->local->hw,
1896                            &sdata->u.mgd.monitor_work);
1897                 /* and do all the other regular work too */
1898                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1899         }
1900 }
1901
1902 #ifdef CONFIG_PM
1903 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1904 {
1905         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1906
1907         /*
1908          * we need to use atomic bitops for the running bits
1909          * only because both timers might fire at the same
1910          * time -- the code here is properly synchronised.
1911          */
1912
1913         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1914         if (del_timer_sync(&ifmgd->timer))
1915                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1916
1917         cancel_work_sync(&ifmgd->chswitch_work);
1918         if (del_timer_sync(&ifmgd->chswitch_timer))
1919                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1920
1921         cancel_work_sync(&ifmgd->monitor_work);
1922         /* these will just be re-established on connection */
1923         del_timer_sync(&ifmgd->conn_mon_timer);
1924         del_timer_sync(&ifmgd->bcn_mon_timer);
1925 }
1926
1927 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1928 {
1929         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1930
1931         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1932                 add_timer(&ifmgd->timer);
1933         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1934                 add_timer(&ifmgd->chswitch_timer);
1935 }
1936 #endif
1937
1938 /* interface setup */
1939 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1940 {
1941         struct ieee80211_if_managed *ifmgd;
1942
1943         ifmgd = &sdata->u.mgd;
1944         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1945         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1946         INIT_WORK(&ifmgd->beacon_connection_loss_work,
1947                   ieee80211_beacon_connection_loss_work);
1948         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1949                     (unsigned long) sdata);
1950         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1951                     (unsigned long) sdata);
1952         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1953                     (unsigned long) sdata);
1954         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1955                     (unsigned long) sdata);
1956
1957         ifmgd->flags = 0;
1958
1959         mutex_init(&ifmgd->mtx);
1960
1961         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1962                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1963         else
1964                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1965 }
1966
1967 /* scan finished notification */
1968 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1969 {
1970         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1971
1972         /* Restart STA timers */
1973         rcu_read_lock();
1974         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1975                 ieee80211_restart_sta_timer(sdata);
1976         rcu_read_unlock();
1977 }
1978
1979 int ieee80211_max_network_latency(struct notifier_block *nb,
1980                                   unsigned long data, void *dummy)
1981 {
1982         s32 latency_usec = (s32) data;
1983         struct ieee80211_local *local =
1984                 container_of(nb, struct ieee80211_local,
1985                              network_latency_notifier);
1986
1987         mutex_lock(&local->iflist_mtx);
1988         ieee80211_recalc_ps(local, latency_usec);
1989         mutex_unlock(&local->iflist_mtx);
1990
1991         return 0;
1992 }
1993
1994 /* config hooks */
1995 static enum work_done_result
1996 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1997                           struct sk_buff *skb)
1998 {
1999         if (!skb) {
2000                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2001                 return WORK_DONE_DESTROY;
2002         }
2003
2004         if (wk->type == IEEE80211_WORK_AUTH) {
2005                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2006                 return WORK_DONE_DESTROY;
2007         }
2008
2009         mutex_lock(&wk->sdata->u.mgd.mtx);
2010         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2011         mutex_unlock(&wk->sdata->u.mgd.mtx);
2012
2013         wk->type = IEEE80211_WORK_AUTH;
2014         wk->probe_auth.tries = 0;
2015         return WORK_DONE_REQUEUE;
2016 }
2017
2018 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2019                        struct cfg80211_auth_request *req)
2020 {
2021         const u8 *ssid;
2022         struct ieee80211_work *wk;
2023         u16 auth_alg;
2024
2025         if (req->local_state_change)
2026                 return 0; /* no need to update mac80211 state */
2027
2028         switch (req->auth_type) {
2029         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2030                 auth_alg = WLAN_AUTH_OPEN;
2031                 break;
2032         case NL80211_AUTHTYPE_SHARED_KEY:
2033                 auth_alg = WLAN_AUTH_SHARED_KEY;
2034                 break;
2035         case NL80211_AUTHTYPE_FT:
2036                 auth_alg = WLAN_AUTH_FT;
2037                 break;
2038         case NL80211_AUTHTYPE_NETWORK_EAP:
2039                 auth_alg = WLAN_AUTH_LEAP;
2040                 break;
2041         default:
2042                 return -EOPNOTSUPP;
2043         }
2044
2045         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2046         if (!wk)
2047                 return -ENOMEM;
2048
2049         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2050
2051         if (req->ie && req->ie_len) {
2052                 memcpy(wk->ie, req->ie, req->ie_len);
2053                 wk->ie_len = req->ie_len;
2054         }
2055
2056         if (req->key && req->key_len) {
2057                 wk->probe_auth.key_len = req->key_len;
2058                 wk->probe_auth.key_idx = req->key_idx;
2059                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2060         }
2061
2062         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2063         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2064         wk->probe_auth.ssid_len = ssid[1];
2065
2066         wk->probe_auth.algorithm = auth_alg;
2067         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2068
2069         /* if we already have a probe, don't probe again */
2070         if (req->bss->proberesp_ies)
2071                 wk->type = IEEE80211_WORK_AUTH;
2072         else
2073                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2074         wk->chan = req->bss->channel;
2075         wk->sdata = sdata;
2076         wk->done = ieee80211_probe_auth_done;
2077
2078         ieee80211_add_work(wk);
2079         return 0;
2080 }
2081
2082 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2083                                                   struct sk_buff *skb)
2084 {
2085         struct ieee80211_mgmt *mgmt;
2086         u16 status;
2087
2088         if (!skb) {
2089                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2090                 return WORK_DONE_DESTROY;
2091         }
2092
2093         mgmt = (void *)skb->data;
2094         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2095
2096         if (status == WLAN_STATUS_SUCCESS) {
2097                 mutex_lock(&wk->sdata->u.mgd.mtx);
2098                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2099                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2100                         /* oops -- internal error -- send timeout for now */
2101                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2102                                                     wk->filter_ta);
2103                         return WORK_DONE_DESTROY;
2104                 }
2105
2106                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2107         }
2108
2109         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2110         return WORK_DONE_DESTROY;
2111 }
2112
2113 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2114                         struct cfg80211_assoc_request *req)
2115 {
2116         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2117         struct ieee80211_bss *bss = (void *)req->bss->priv;
2118         struct ieee80211_work *wk;
2119         const u8 *ssid;
2120         int i;
2121
2122         mutex_lock(&ifmgd->mtx);
2123         if (ifmgd->associated) {
2124                 if (!req->prev_bssid ||
2125                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2126                            ETH_ALEN)) {
2127                         /*
2128                          * We are already associated and the request was not a
2129                          * reassociation request from the current BSS, so
2130                          * reject it.
2131                          */
2132                         mutex_unlock(&ifmgd->mtx);
2133                         return -EALREADY;
2134                 }
2135
2136                 /* Trying to reassociate - clear previous association state */
2137                 ieee80211_set_disassoc(sdata, true);
2138         }
2139         mutex_unlock(&ifmgd->mtx);
2140
2141         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2142         if (!wk)
2143                 return -ENOMEM;
2144
2145         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2146         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2147
2148         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2149                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2150                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2151                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2152                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2153
2154
2155         if (req->ie && req->ie_len) {
2156                 memcpy(wk->ie, req->ie, req->ie_len);
2157                 wk->ie_len = req->ie_len;
2158         } else
2159                 wk->ie_len = 0;
2160
2161         wk->assoc.bss = req->bss;
2162
2163         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2164
2165         /* new association always uses requested smps mode */
2166         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2167                 if (ifmgd->powersave)
2168                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2169                 else
2170                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2171         } else
2172                 ifmgd->ap_smps = ifmgd->req_smps;
2173
2174         wk->assoc.smps = ifmgd->ap_smps;
2175         /*
2176          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2177          * We still associate in non-HT mode (11a/b/g) if any one of these
2178          * ciphers is configured as pairwise.
2179          * We can set this to true for non-11n hardware, that'll be checked
2180          * separately along with the peer capabilities.
2181          */
2182         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2183         wk->assoc.capability = req->bss->capability;
2184         wk->assoc.wmm_used = bss->wmm_used;
2185         wk->assoc.supp_rates = bss->supp_rates;
2186         wk->assoc.supp_rates_len = bss->supp_rates_len;
2187         wk->assoc.ht_information_ie =
2188                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2189
2190         if (bss->wmm_used && bss->uapsd_supported &&
2191             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2192                 wk->assoc.uapsd_used = true;
2193                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2194         } else {
2195                 wk->assoc.uapsd_used = false;
2196                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2197         }
2198
2199         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2200         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2201         wk->assoc.ssid_len = ssid[1];
2202
2203         if (req->prev_bssid)
2204                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2205
2206         wk->type = IEEE80211_WORK_ASSOC;
2207         wk->chan = req->bss->channel;
2208         wk->sdata = sdata;
2209         wk->done = ieee80211_assoc_done;
2210
2211         if (req->use_mfp) {
2212                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2213                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2214         } else {
2215                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2216                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2217         }
2218
2219         if (req->crypto.control_port)
2220                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2221         else
2222                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2223
2224         ieee80211_add_work(wk);
2225         return 0;
2226 }
2227
2228 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2229                          struct cfg80211_deauth_request *req,
2230                          void *cookie)
2231 {
2232         struct ieee80211_local *local = sdata->local;
2233         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2234         struct ieee80211_work *wk;
2235         u8 bssid[ETH_ALEN];
2236         bool assoc_bss = false;
2237
2238         mutex_lock(&ifmgd->mtx);
2239
2240         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2241         if (ifmgd->associated == req->bss) {
2242                 ieee80211_set_disassoc(sdata, false);
2243                 mutex_unlock(&ifmgd->mtx);
2244                 assoc_bss = true;
2245         } else {
2246                 bool not_auth_yet = false;
2247
2248                 mutex_unlock(&ifmgd->mtx);
2249
2250                 mutex_lock(&local->work_mtx);
2251                 list_for_each_entry(wk, &local->work_list, list) {
2252                         if (wk->sdata != sdata)
2253                                 continue;
2254
2255                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2256                             wk->type != IEEE80211_WORK_AUTH &&
2257                             wk->type != IEEE80211_WORK_ASSOC)
2258                                 continue;
2259
2260                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2261                                 continue;
2262
2263                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2264                         list_del_rcu(&wk->list);
2265                         free_work(wk);
2266                         break;
2267                 }
2268                 mutex_unlock(&local->work_mtx);
2269
2270                 /*
2271                  * If somebody requests authentication and we haven't
2272                  * sent out an auth frame yet there's no need to send
2273                  * out a deauth frame either. If the state was PROBE,
2274                  * then this is the case. If it's AUTH we have sent a
2275                  * frame, and if it's IDLE we have completed the auth
2276                  * process already.
2277                  */
2278                 if (not_auth_yet) {
2279                         __cfg80211_auth_canceled(sdata->dev, bssid);
2280                         return 0;
2281                 }
2282         }
2283
2284         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2285                sdata->name, bssid, req->reason_code);
2286
2287         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2288                                        req->reason_code, cookie,
2289                                        !req->local_state_change);
2290         if (assoc_bss)
2291                 sta_info_destroy_addr(sdata, bssid);
2292
2293         ieee80211_recalc_idle(sdata->local);
2294
2295         return 0;
2296 }
2297
2298 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2299                            struct cfg80211_disassoc_request *req,
2300                            void *cookie)
2301 {
2302         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2303         u8 bssid[ETH_ALEN];
2304
2305         mutex_lock(&ifmgd->mtx);
2306
2307         /*
2308          * cfg80211 should catch this ... but it's racy since
2309          * we can receive a disassoc frame, process it, hand it
2310          * to cfg80211 while that's in a locked section already
2311          * trying to tell us that the user wants to disconnect.
2312          */
2313         if (ifmgd->associated != req->bss) {
2314                 mutex_unlock(&ifmgd->mtx);
2315                 return -ENOLINK;
2316         }
2317
2318         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2319                sdata->name, req->bss->bssid, req->reason_code);
2320
2321         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2322         ieee80211_set_disassoc(sdata, false);
2323
2324         mutex_unlock(&ifmgd->mtx);
2325
2326         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2327                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2328                         cookie, !req->local_state_change);
2329         sta_info_destroy_addr(sdata, bssid);
2330
2331         ieee80211_recalc_idle(sdata->local);
2332
2333         return 0;
2334 }
2335
2336 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2337                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2338                                gfp_t gfp)
2339 {
2340         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2341
2342         trace_api_cqm_rssi_notify(sdata, rssi_event);
2343
2344         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2345 }
2346 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);