net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/pm_qos_params.h>
  21 #include <linux/crc32.h>
  22 #include <linux/slab.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "driver-ops.h"
  28 #include "rate.h"
  29 #include "led.h"
  30
  31 #define IEEE80211_MAX_PROBE_TRIES 5
  32
  33 /*
  34  * beacon loss detection timeout
  35  * XXX: should depend on beacon interval
  36  */
  37 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
  38 /*
  39  * Time the connection can be idle before we probe
  40  * it to see if we can still talk to the AP.
  41  */
  42 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  43 /*
  44  * Time we wait for a probe response after sending
  45  * a probe request because of beacon loss or for
  46  * checking the connection still works.
  47  */
  48 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  49
  50 /*
  51  * Weight given to the latest Beacon frame when calculating average signal
  52  * strength for Beacon frames received in the current BSS. This must be
  53  * between 1 and 15.
  54  */
  55 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  56
  57 #define TMR_RUNNING_TIMER       0
  58 #define TMR_RUNNING_CHANSW      1
  59
  60 /*
  61  * All cfg80211 functions have to be called outside a locked
  62  * section so that they can acquire a lock themselves... This
  63  * is much simpler than queuing up things in cfg80211, but we
  64  * do need some indirection for that here.
  65  */
  66 enum rx_mgmt_action {
  67         /* no action required */
  68         RX_MGMT_NONE,
  69
  70         /* caller must call cfg80211_send_rx_auth() */
  71         RX_MGMT_CFG80211_AUTH,
  72
  73         /* caller must call cfg80211_send_rx_assoc() */
  74         RX_MGMT_CFG80211_ASSOC,
  75
  76         /* caller must call cfg80211_send_deauth() */
  77         RX_MGMT_CFG80211_DEAUTH,
  78
  79         /* caller must call cfg80211_send_disassoc() */
  80         RX_MGMT_CFG80211_DISASSOC,
  81
  82         /* caller must tell cfg80211 about internal error */
  83         RX_MGMT_CFG80211_ASSOC_ERROR,
  84 };
  85
  86 /* utils */
  87 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  88 {
  89         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  90 }
  91
  92 /*
  93  * We can have multiple work items (and connection probing)
  94  * scheduling this timer, but we need to take care to only
  95  * reschedule it when it should fire _earlier_ than it was
  96  * asked for before, or if it's not pending right now. This
  97  * function ensures that. Note that it then is required to
  98  * run this function for all timeouts after the first one
  99  * has happened -- the work that runs from this timer will
 100  * do that.
 101  */
 102 static void run_again(struct ieee80211_if_managed *ifmgd,
 103                              unsigned long timeout)
 104 {
 105         ASSERT_MGD_MTX(ifmgd);
 106
 107         if (!timer_pending(&ifmgd->timer) ||
 108             time_before(timeout, ifmgd->timer.expires))
 109                 mod_timer(&ifmgd->timer, timeout);
 110 }
 111
 112 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 113 {
 114         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 115                 return;
 116
 117         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 118                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 119 }
 120
 121 static int ecw2cw(int ecw)
 122 {
 123         return (1 << ecw) - 1;
 124 }
 125
 126 /*
 127  * ieee80211_enable_ht should be called only after the operating band
 128  * has been determined as ht configuration depends on the hw's
 129  * HT abilities for a specific band.
 130  */
 131 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 132                                struct ieee80211_ht_info *hti,
 133                                const u8 *bssid, u16 ap_ht_cap_flags)
 134 {
 135         struct ieee80211_local *local = sdata->local;
 136         struct ieee80211_supported_band *sband;
 137         struct sta_info *sta;
 138         u32 changed = 0;
 139         u16 ht_opmode;
 140         bool enable_ht = true;
 141         enum nl80211_channel_type prev_chantype;
 142         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 143
 144         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 145
 146         prev_chantype = sdata->vif.bss_conf.channel_type;
 147
 148         /* HT is not supported */
 149         if (!sband->ht_cap.ht_supported)
 150                 enable_ht = false;
 151
 152         /* check that channel matches the right operating channel */
 153         if (local->hw.conf.channel->center_freq !=
 154             ieee80211_channel_to_frequency(hti->control_chan))
 155                 enable_ht = false;
 156
 157         if (enable_ht) {
 158                 channel_type = NL80211_CHAN_HT20;
 159
 160                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 161                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 162                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 163                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 164                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 165                                 if (!(local->hw.conf.channel->flags &
 166                                     IEEE80211_CHAN_NO_HT40PLUS))
 167                                         channel_type = NL80211_CHAN_HT40PLUS;
 168                                 break;
 169                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 170                                 if (!(local->hw.conf.channel->flags &
 171                                     IEEE80211_CHAN_NO_HT40MINUS))
 172                                         channel_type = NL80211_CHAN_HT40MINUS;
 173                                 break;
 174                         }
 175                 }
 176         }
 177
 178         if (local->tmp_channel)
 179                 local->tmp_channel_type = channel_type;
 180
 181         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 182                 /* can only fail due to HT40+/- mismatch */
 183                 channel_type = NL80211_CHAN_HT20;
 184                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 185         }
 186
 187         /* channel_type change automatically detected */
 188         ieee80211_hw_config(local, 0);
 189
 190         if (prev_chantype != channel_type) {
 191                 rcu_read_lock();
 192                 sta = sta_info_get(sdata, bssid);
 193                 if (sta)
 194                         rate_control_rate_update(local, sband, sta,
 195                                                  IEEE80211_RC_HT_CHANGED,
 196                                                  channel_type);
 197                 rcu_read_unlock();
 198         }
 199
 200         ht_opmode = le16_to_cpu(hti->operation_mode);
 201
 202         /* if bss configuration changed store the new one */
 203         if (sdata->ht_opmode_valid != enable_ht ||
 204             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 205             prev_chantype != channel_type) {
 206                 changed |= BSS_CHANGED_HT;
 207                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 208                 sdata->ht_opmode_valid = enable_ht;
 209         }
 210
 211         return changed;
 212 }
 213
 214 /* frame sending functions */
 215
 216 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 217                                            const u8 *bssid, u16 stype, u16 reason,
 218                                            void *cookie, bool send_frame)
 219 {
 220         struct ieee80211_local *local = sdata->local;
 221         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 222         struct sk_buff *skb;
 223         struct ieee80211_mgmt *mgmt;
 224
 225         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 226         if (!skb) {
 227                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 228                        "deauth/disassoc frame\n", sdata->name);
 229                 return;
 230         }
 231         skb_reserve(skb, local->hw.extra_tx_headroom);
 232
 233         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 234         memset(mgmt, 0, 24);
 235         memcpy(mgmt->da, bssid, ETH_ALEN);
 236         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 237         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 238         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 239         skb_put(skb, 2);
 240         /* u.deauth.reason_code == u.disassoc.reason_code */
 241         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 242
 243         if (stype == IEEE80211_STYPE_DEAUTH)
 244                 if (cookie)
 245                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 246                 else
 247                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 248         else
 249                 if (cookie)
 250                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 251                 else
 252                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 253         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 254                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 255
 256         if (send_frame)
 257                 ieee80211_tx_skb(sdata, skb);
 258         else
 259                 kfree_skb(skb);
 260 }
 261
 262 void ieee80211_send_pspoll(struct ieee80211_local *local,
 263                            struct ieee80211_sub_if_data *sdata)
 264 {
 265         struct ieee80211_pspoll *pspoll;
 266         struct sk_buff *skb;
 267
 268         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 269         if (!skb)
 270                 return;
 271
 272         pspoll = (struct ieee80211_pspoll *) skb->data;
 273         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 274
 275         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 276         ieee80211_tx_skb(sdata, skb);
 277 }
 278
 279 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 280                              struct ieee80211_sub_if_data *sdata,
 281                              int powersave)
 282 {
 283         struct sk_buff *skb;
 284         struct ieee80211_hdr_3addr *nullfunc;
 285
 286         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 287         if (!skb)
 288                 return;
 289
 290         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 291         if (powersave)
 292                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 293
 294         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 295         ieee80211_tx_skb(sdata, skb);
 296 }
 297
 298 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 299                                           struct ieee80211_sub_if_data *sdata)
 300 {
 301         struct sk_buff *skb;
 302         struct ieee80211_hdr *nullfunc;
 303         __le16 fc;
 304
 305         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 306                 return;
 307
 308         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 309         if (!skb) {
 310                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 311                        "nullfunc frame\n", sdata->name);
 312                 return;
 313         }
 314         skb_reserve(skb, local->hw.extra_tx_headroom);
 315
 316         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 317         memset(nullfunc, 0, 30);
 318         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 319                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 320         nullfunc->frame_control = fc;
 321         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 322         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 323         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 324         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 325
 326         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 327         ieee80211_tx_skb(sdata, skb);
 328 }
 329
 330 /* spectrum management related things */
 331 static void ieee80211_chswitch_work(struct work_struct *work)
 332 {
 333         struct ieee80211_sub_if_data *sdata =
 334                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 335         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 336
 337         if (!ieee80211_sdata_running(sdata))
 338                 return;
 339
 340         mutex_lock(&ifmgd->mtx);
 341         if (!ifmgd->associated)
 342                 goto out;
 343
 344         sdata->local->oper_channel = sdata->local->csa_channel;
 345         if (!sdata->local->ops->channel_switch) {
 346                 /* call "hw_config" only if doing sw channel switch */
 347                 ieee80211_hw_config(sdata->local,
 348                         IEEE80211_CONF_CHANGE_CHANNEL);
 349         }
 350
 351         /* XXX: shouldn't really modify cfg80211-owned data! */
 352         ifmgd->associated->channel = sdata->local->oper_channel;
 353
 354         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 355                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 356  out:
 357         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 358         mutex_unlock(&ifmgd->mtx);
 359 }
 360
 361 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 362 {
 363         struct ieee80211_sub_if_data *sdata;
 364         struct ieee80211_if_managed *ifmgd;
 365
 366         sdata = vif_to_sdata(vif);
 367         ifmgd = &sdata->u.mgd;
 368
 369         trace_api_chswitch_done(sdata, success);
 370         if (!success) {
 371                 /*
 372                  * If the channel switch was not successful, stay
 373                  * around on the old channel. We currently lack
 374                  * good handling of this situation, possibly we
 375                  * should just drop the association.
 376                  */
 377                 sdata->local->csa_channel = sdata->local->oper_channel;
 378         }
 379
 380         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 381 }
 382 EXPORT_SYMBOL(ieee80211_chswitch_done);
 383
 384 static void ieee80211_chswitch_timer(unsigned long data)
 385 {
 386         struct ieee80211_sub_if_data *sdata =
 387                 (struct ieee80211_sub_if_data *) data;
 388         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 389
 390         if (sdata->local->quiescing) {
 391                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 392                 return;
 393         }
 394
 395         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 396 }
 397
 398 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 399                                       struct ieee80211_channel_sw_ie *sw_elem,
 400                                       struct ieee80211_bss *bss,
 401                                       u64 timestamp)
 402 {
 403         struct cfg80211_bss *cbss =
 404                 container_of((void *)bss, struct cfg80211_bss, priv);
 405         struct ieee80211_channel *new_ch;
 406         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 407         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 408
 409         ASSERT_MGD_MTX(ifmgd);
 410
 411         if (!ifmgd->associated)
 412                 return;
 413
 414         if (sdata->local->scanning)
 415                 return;
 416
 417         /* Disregard subsequent beacons if we are already running a timer
 418            processing a CSA */
 419
 420         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 421                 return;
 422
 423         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 424         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 425                 return;
 426
 427         sdata->local->csa_channel = new_ch;
 428
 429         if (sdata->local->ops->channel_switch) {
 430                 /* use driver's channel switch callback */
 431                 struct ieee80211_channel_switch ch_switch;
 432                 memset(&ch_switch, 0, sizeof(ch_switch));
 433                 ch_switch.timestamp = timestamp;
 434                 if (sw_elem->mode) {
 435                         ch_switch.block_tx = true;
 436                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 437                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 438                 }
 439                 ch_switch.channel = new_ch;
 440                 ch_switch.count = sw_elem->count;
 441                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 442                 drv_channel_switch(sdata->local, &ch_switch);
 443                 return;
 444         }
 445
 446         /* channel switch handled in software */
 447         if (sw_elem->count <= 1) {
 448                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 449         } else {
 450                 if (sw_elem->mode)
 451                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 452                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 453                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 454                 mod_timer(&ifmgd->chswitch_timer,
 455                           jiffies +
 456                           msecs_to_jiffies(sw_elem->count *
 457                                            cbss->beacon_interval));
 458         }
 459 }
 460
 461 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 462                                         u16 capab_info, u8 *pwr_constr_elem,
 463                                         u8 pwr_constr_elem_len)
 464 {
 465         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 466
 467         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 468                 return;
 469
 470         /* Power constraint IE length should be 1 octet */
 471         if (pwr_constr_elem_len != 1)
 472                 return;
 473
 474         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 475             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 476                 sdata->local->power_constr_level = *pwr_constr_elem;
 477                 ieee80211_hw_config(sdata->local, 0);
 478         }
 479 }
 480
 481 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 482 {
 483         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 484         struct ieee80211_local *local = sdata->local;
 485         struct ieee80211_conf *conf = &local->hw.conf;
 486
 487         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 488                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 489                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 490
 491         local->disable_dynamic_ps = false;
 492         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 493 }
 494 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 495
 496 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 497 {
 498         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 499         struct ieee80211_local *local = sdata->local;
 500         struct ieee80211_conf *conf = &local->hw.conf;
 501
 502         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 503                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 504                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 505
 506         local->disable_dynamic_ps = true;
 507         conf->dynamic_ps_timeout = 0;
 508         del_timer_sync(&local->dynamic_ps_timer);
 509         ieee80211_queue_work(&local->hw,
 510                              &local->dynamic_ps_enable_work);
 511 }
 512 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 513
 514 /* powersave */
 515 static void ieee80211_enable_ps(struct ieee80211_local *local,
 516                                 struct ieee80211_sub_if_data *sdata)
 517 {
 518         struct ieee80211_conf *conf = &local->hw.conf;
 519
 520         /*
 521          * If we are scanning right now then the parameters will
 522          * take effect when scan finishes.
 523          */
 524         if (local->scanning)
 525                 return;
 526
 527         if (conf->dynamic_ps_timeout > 0 &&
 528             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 529                 mod_timer(&local->dynamic_ps_timer, jiffies +
 530                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 531         } else {
 532                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 533                         ieee80211_send_nullfunc(local, sdata, 1);
 534
 535                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 536                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 537                         return;
 538
 539                 conf->flags |= IEEE80211_CONF_PS;
 540                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 541         }
 542 }
 543
 544 static void ieee80211_change_ps(struct ieee80211_local *local)
 545 {
 546         struct ieee80211_conf *conf = &local->hw.conf;
 547
 548         if (local->ps_sdata) {
 549                 ieee80211_enable_ps(local, local->ps_sdata);
 550         } else if (conf->flags & IEEE80211_CONF_PS) {
 551                 conf->flags &= ~IEEE80211_CONF_PS;
 552                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 553                 del_timer_sync(&local->dynamic_ps_timer);
 554                 cancel_work_sync(&local->dynamic_ps_enable_work);
 555         }
 556 }
 557
 558 /* need to hold RTNL or interface lock */
 559 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 560 {
 561         struct ieee80211_sub_if_data *sdata, *found = NULL;
 562         int count = 0;
 563         int timeout;
 564
 565         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 566                 local->ps_sdata = NULL;
 567                 return;
 568         }
 569
 570         if (!list_empty(&local->work_list)) {
 571                 local->ps_sdata = NULL;
 572                 goto change;
 573         }
 574
 575         list_for_each_entry(sdata, &local->interfaces, list) {
 576                 if (!ieee80211_sdata_running(sdata))
 577                         continue;
 578                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 579                         continue;
 580                 found = sdata;
 581                 count++;
 582         }
 583
 584         if (count == 1 && found->u.mgd.powersave &&
 585             found->u.mgd.associated &&
 586             found->u.mgd.associated->beacon_ies &&
 587             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 588                                     IEEE80211_STA_CONNECTION_POLL))) {
 589                 struct ieee80211_conf *conf = &local->hw.conf;
 590                 s32 beaconint_us;
 591
 592                 if (latency < 0)
 593                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 594
 595                 beaconint_us = ieee80211_tu_to_usec(
 596                                         found->vif.bss_conf.beacon_int);
 597
 598                 timeout = local->dynamic_ps_forced_timeout;
 599                 if (timeout < 0) {
 600                         /*
 601                          * Go to full PSM if the user configures a very low
 602                          * latency requirement.
 603                          * The 2 second value is there for compatibility until
 604                          * the PM_QOS_NETWORK_LATENCY is configured with real
 605                          * values.
 606                          */
 607                         if (latency > 1900000000 && latency != 2000000000)
 608                                 timeout = 0;
 609                         else
 610                                 timeout = 100;
 611                 }
 612                 local->dynamic_ps_user_timeout = timeout;
 613                 if (!local->disable_dynamic_ps)
 614                         conf->dynamic_ps_timeout =
 615                                 local->dynamic_ps_user_timeout;
 616
 617                 if (beaconint_us > latency) {
 618                         local->ps_sdata = NULL;
 619                 } else {
 620                         struct ieee80211_bss *bss;
 621                         int maxslp = 1;
 622                         u8 dtimper;
 623
 624                         bss = (void *)found->u.mgd.associated->priv;
 625                         dtimper = bss->dtim_period;
 626
 627                         /* If the TIM IE is invalid, pretend the value is 1 */
 628                         if (!dtimper)
 629                                 dtimper = 1;
 630                         else if (dtimper > 1)
 631                                 maxslp = min_t(int, dtimper,
 632                                                     latency / beaconint_us);
 633
 634                         local->hw.conf.max_sleep_period = maxslp;
 635                         local->hw.conf.ps_dtim_period = dtimper;
 636                         local->ps_sdata = found;
 637                 }
 638         } else {
 639                 local->ps_sdata = NULL;
 640         }
 641
 642  change:
 643         ieee80211_change_ps(local);
 644 }
 645
 646 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 647 {
 648         struct ieee80211_local *local =
 649                 container_of(work, struct ieee80211_local,
 650                              dynamic_ps_disable_work);
 651
 652         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 653                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 654                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 655         }
 656
 657         ieee80211_wake_queues_by_reason(&local->hw,
 658                                         IEEE80211_QUEUE_STOP_REASON_PS);
 659 }
 660
 661 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 662 {
 663         struct ieee80211_local *local =
 664                 container_of(work, struct ieee80211_local,
 665                              dynamic_ps_enable_work);
 666         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 667         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 668
 669         /* can only happen when PS was just disabled anyway */
 670         if (!sdata)
 671                 return;
 672
 673         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 674                 return;
 675
 676         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 677             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 678                 ieee80211_send_nullfunc(local, sdata, 1);
 679
 680         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 681               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 682             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 683                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 684                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 685                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 686         }
 687 }
 688
 689 void ieee80211_dynamic_ps_timer(unsigned long data)
 690 {
 691         struct ieee80211_local *local = (void *) data;
 692
 693         if (local->quiescing || local->suspended)
 694                 return;
 695
 696         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 697 }
 698
 699 /* MLME */
 700 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 701                                      struct ieee80211_sub_if_data *sdata,
 702                                      u8 *wmm_param, size_t wmm_param_len)
 703 {
 704         struct ieee80211_tx_queue_params params;
 705         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 706         size_t left;
 707         int count;
 708         u8 *pos, uapsd_queues = 0;
 709
 710         if (!local->ops->conf_tx)
 711                 return;
 712
 713         if (local->hw.queues < 4)
 714                 return;
 715
 716         if (!wmm_param)
 717                 return;
 718
 719         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 720                 return;
 721
 722         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 723                 uapsd_queues = local->uapsd_queues;
 724
 725         count = wmm_param[6] & 0x0f;
 726         if (count == ifmgd->wmm_last_param_set)
 727                 return;
 728         ifmgd->wmm_last_param_set = count;
 729
 730         pos = wmm_param + 8;
 731         left = wmm_param_len - 8;
 732
 733         memset(&params, 0, sizeof(params));
 734
 735         local->wmm_acm = 0;
 736         for (; left >= 4; left -= 4, pos += 4) {
 737                 int aci = (pos[0] >> 5) & 0x03;
 738                 int acm = (pos[0] >> 4) & 0x01;
 739                 bool uapsd = false;
 740                 int queue;
 741
 742                 switch (aci) {
 743                 case 1: /* AC_BK */
 744                         queue = 3;
 745                         if (acm)
 746                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 747                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 748                                 uapsd = true;
 749                         break;
 750                 case 2: /* AC_VI */
 751                         queue = 1;
 752                         if (acm)
 753                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 754                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 755                                 uapsd = true;
 756                         break;
 757                 case 3: /* AC_VO */
 758                         queue = 0;
 759                         if (acm)
 760                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 761                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 762                                 uapsd = true;
 763                         break;
 764                 case 0: /* AC_BE */
 765                 default:
 766                         queue = 2;
 767                         if (acm)
 768                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 769                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 770                                 uapsd = true;
 771                         break;
 772                 }
 773
 774                 params.aifs = pos[0] & 0x0f;
 775                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 776                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 777                 params.txop = get_unaligned_le16(pos + 2);
 778                 params.uapsd = uapsd;
 779
 780 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 781                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 782                        "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 783                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 784                        params.aifs, params.cw_min, params.cw_max, params.txop,
 785                        params.uapsd);
 786 #endif
 787                 if (drv_conf_tx(local, queue, &params))
 788                         printk(KERN_DEBUG "%s: failed to set TX queue "
 789                                "parameters for queue %d\n",
 790                                wiphy_name(local->hw.wiphy), queue);
 791         }
 792
 793         /* enable WMM or activate new settings */
 794         sdata->vif.bss_conf.qos = true;
 795         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 796 }
 797
 798 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 799                                            u16 capab, bool erp_valid, u8 erp)
 800 {
 801         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 802         u32 changed = 0;
 803         bool use_protection;
 804         bool use_short_preamble;
 805         bool use_short_slot;
 806
 807         if (erp_valid) {
 808                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 809                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 810         } else {
 811                 use_protection = false;
 812                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 813         }
 814
 815         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 816         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 817                 use_short_slot = true;
 818
 819         if (use_protection != bss_conf->use_cts_prot) {
 820                 bss_conf->use_cts_prot = use_protection;
 821                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 822         }
 823
 824         if (use_short_preamble != bss_conf->use_short_preamble) {
 825                 bss_conf->use_short_preamble = use_short_preamble;
 826                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 827         }
 828
 829         if (use_short_slot != bss_conf->use_short_slot) {
 830                 bss_conf->use_short_slot = use_short_slot;
 831                 changed |= BSS_CHANGED_ERP_SLOT;
 832         }
 833
 834         return changed;
 835 }
 836
 837 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 838                                      struct cfg80211_bss *cbss,
 839                                      u32 bss_info_changed)
 840 {
 841         struct ieee80211_bss *bss = (void *)cbss->priv;
 842         struct ieee80211_local *local = sdata->local;
 843         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 844
 845         bss_info_changed |= BSS_CHANGED_ASSOC;
 846         /* set timing information */
 847         bss_conf->beacon_int = cbss->beacon_interval;
 848         bss_conf->timestamp = cbss->tsf;
 849
 850         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 851         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 852                 cbss->capability, bss->has_erp_value, bss->erp_value);
 853
 854         sdata->u.mgd.associated = cbss;
 855         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 856
 857         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 858
 859         /* just to be sure */
 860         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 861                                 IEEE80211_STA_BEACON_POLL);
 862
 863         /*
 864          * Always handle WMM once after association regardless
 865          * of the first value the AP uses. Setting -1 here has
 866          * that effect because the AP values is an unsigned
 867          * 4-bit value.
 868          */
 869         sdata->u.mgd.wmm_last_param_set = -1;
 870
 871         ieee80211_led_assoc(local, 1);
 872
 873         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
 874                 bss_conf->dtim_period = bss->dtim_period;
 875         else
 876                 bss_conf->dtim_period = 0;
 877
 878         bss_conf->assoc = 1;
 879         /*
 880          * For now just always ask the driver to update the basic rateset
 881          * when we have associated, we aren't checking whether it actually
 882          * changed or not.
 883          */
 884         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 885
 886         /* And the BSSID changed - we're associated now */
 887         bss_info_changed |= BSS_CHANGED_BSSID;
 888
 889         /* Tell the driver to monitor connection quality (if supported) */
 890         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 891             bss_conf->cqm_rssi_thold)
 892                 bss_info_changed |= BSS_CHANGED_CQM;
 893
 894         /* Enable ARP filtering */
 895         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
 896                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 897                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
 898         }
 899
 900         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 901
 902         mutex_lock(&local->iflist_mtx);
 903         ieee80211_recalc_ps(local, -1);
 904         ieee80211_recalc_smps(local, sdata);
 905         mutex_unlock(&local->iflist_mtx);
 906
 907         netif_tx_start_all_queues(sdata->dev);
 908         netif_carrier_on(sdata->dev);
 909 }
 910
 911 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 912                                    bool remove_sta)
 913 {
 914         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 915         struct ieee80211_local *local = sdata->local;
 916         struct sta_info *sta;
 917         u32 changed = 0, config_changed = 0;
 918         u8 bssid[ETH_ALEN];
 919
 920         ASSERT_MGD_MTX(ifmgd);
 921
 922         if (WARN_ON(!ifmgd->associated))
 923                 return;
 924
 925         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 926
 927         ifmgd->associated = NULL;
 928         memset(ifmgd->bssid, 0, ETH_ALEN);
 929
 930         /*
 931          * we need to commit the associated = NULL change because the
 932          * scan code uses that to determine whether this iface should
 933          * go to/wake up from powersave or not -- and could otherwise
 934          * wake the queues erroneously.
 935          */
 936         smp_mb();
 937
 938         /*
 939          * Thus, we can only afterwards stop the queues -- to account
 940          * for the case where another CPU is finishing a scan at this
 941          * time -- we don't want the scan code to enable queues.
 942          */
 943
 944         netif_tx_stop_all_queues(sdata->dev);
 945         netif_carrier_off(sdata->dev);
 946
 947         mutex_lock(&local->sta_mtx);
 948         sta = sta_info_get(sdata, bssid);
 949         if (sta) {
 950                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
 951                 ieee80211_sta_tear_down_BA_sessions(sta);
 952         }
 953         mutex_unlock(&local->sta_mtx);
 954
 955         changed |= ieee80211_reset_erp_info(sdata);
 956
 957         ieee80211_led_assoc(local, 0);
 958         changed |= BSS_CHANGED_ASSOC;
 959         sdata->vif.bss_conf.assoc = false;
 960
 961         ieee80211_set_wmm_default(sdata);
 962
 963         /* channel(_type) changes are handled by ieee80211_hw_config */
 964         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
 965
 966         /* on the next assoc, re-program HT parameters */
 967         sdata->ht_opmode_valid = false;
 968
 969         local->power_constr_level = 0;
 970
 971         del_timer_sync(&local->dynamic_ps_timer);
 972         cancel_work_sync(&local->dynamic_ps_enable_work);
 973
 974         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 975                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 976                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 977         }
 978
 979         ieee80211_hw_config(local, config_changed);
 980
 981         /* Disable ARP filtering */
 982         if (sdata->vif.bss_conf.arp_filter_enabled) {
 983                 sdata->vif.bss_conf.arp_filter_enabled = false;
 984                 changed |= BSS_CHANGED_ARP_FILTER;
 985         }
 986
 987         /* The BSSID (not really interesting) and HT changed */
 988         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
 989         ieee80211_bss_info_change_notify(sdata, changed);
 990
 991         if (remove_sta)
 992                 sta_info_destroy_addr(sdata, bssid);
 993 }
 994
 995 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 996                              struct ieee80211_hdr *hdr)
 997 {
 998         /*
 999          * We can postpone the mgd.timer whenever receiving unicast frames
1000          * from AP because we know that the connection is working both ways
1001          * at that time. But multicast frames (and hence also beacons) must
1002          * be ignored here, because we need to trigger the timer during
1003          * data idle periods for sending the periodic probe request to the
1004          * AP we're connected to.
1005          */
1006         if (is_multicast_ether_addr(hdr->addr1))
1007                 return;
1008
1009         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1010                 return;
1011
1012         mod_timer(&sdata->u.mgd.conn_mon_timer,
1013                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1014 }
1015
1016 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1017 {
1018         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1019         const u8 *ssid;
1020
1021         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1022         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
1023                                  ssid + 2, ssid[1], NULL, 0);
1024
1025         ifmgd->probe_send_count++;
1026         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1027         run_again(ifmgd, ifmgd->probe_timeout);
1028 }
1029
1030 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1031                                    bool beacon)
1032 {
1033         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1034         bool already = false;
1035
1036         if (!ieee80211_sdata_running(sdata))
1037                 return;
1038
1039         if (sdata->local->scanning)
1040                 return;
1041
1042         if (sdata->local->tmp_channel)
1043                 return;
1044
1045         mutex_lock(&ifmgd->mtx);
1046
1047         if (!ifmgd->associated)
1048                 goto out;
1049
1050 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1051         if (beacon && net_ratelimit())
1052                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1053                        "- sending probe request\n", sdata->name);
1054 #endif
1055
1056         /*
1057          * The driver/our work has already reported this event or the
1058          * connection monitoring has kicked in and we have already sent
1059          * a probe request. Or maybe the AP died and the driver keeps
1060          * reporting until we disassociate...
1061          *
1062          * In either case we have to ignore the current call to this
1063          * function (except for setting the correct probe reason bit)
1064          * because otherwise we would reset the timer every time and
1065          * never check whether we received a probe response!
1066          */
1067         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1068                             IEEE80211_STA_CONNECTION_POLL))
1069                 already = true;
1070
1071         if (beacon)
1072                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1073         else
1074                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1075
1076         if (already)
1077                 goto out;
1078
1079         mutex_lock(&sdata->local->iflist_mtx);
1080         ieee80211_recalc_ps(sdata->local, -1);
1081         mutex_unlock(&sdata->local->iflist_mtx);
1082
1083         ifmgd->probe_send_count = 0;
1084         ieee80211_mgd_probe_ap_send(sdata);
1085  out:
1086         mutex_unlock(&ifmgd->mtx);
1087 }
1088
1089 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1090 {
1091         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1092         struct ieee80211_local *local = sdata->local;
1093         u8 bssid[ETH_ALEN];
1094
1095         mutex_lock(&ifmgd->mtx);
1096         if (!ifmgd->associated) {
1097                 mutex_unlock(&ifmgd->mtx);
1098                 return;
1099         }
1100
1101         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1102
1103         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1104
1105         ieee80211_set_disassoc(sdata, true);
1106         ieee80211_recalc_idle(local);
1107         mutex_unlock(&ifmgd->mtx);
1108         /*
1109          * must be outside lock due to cfg80211,
1110          * but that's not a problem.
1111          */
1112         ieee80211_send_deauth_disassoc(sdata, bssid,
1113                                        IEEE80211_STYPE_DEAUTH,
1114                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1115                                        NULL, true);
1116 }
1117
1118 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1119 {
1120         struct ieee80211_sub_if_data *sdata =
1121                 container_of(work, struct ieee80211_sub_if_data,
1122                              u.mgd.beacon_connection_loss_work);
1123
1124         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1125                 __ieee80211_connection_loss(sdata);
1126         else
1127                 ieee80211_mgd_probe_ap(sdata, true);
1128 }
1129
1130 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1131 {
1132         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1133         struct ieee80211_hw *hw = &sdata->local->hw;
1134
1135         trace_api_beacon_loss(sdata);
1136
1137         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1138         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1139 }
1140 EXPORT_SYMBOL(ieee80211_beacon_loss);
1141
1142 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1143 {
1144         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1145         struct ieee80211_hw *hw = &sdata->local->hw;
1146
1147         trace_api_connection_loss(sdata);
1148
1149         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1150         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1151 }
1152 EXPORT_SYMBOL(ieee80211_connection_loss);
1153
1154
1155 static enum rx_mgmt_action __must_check
1156 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1157                          struct ieee80211_mgmt *mgmt, size_t len)
1158 {
1159         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1160         const u8 *bssid = NULL;
1161         u16 reason_code;
1162
1163         if (len < 24 + 2)
1164                 return RX_MGMT_NONE;
1165
1166         ASSERT_MGD_MTX(ifmgd);
1167
1168         bssid = ifmgd->associated->bssid;
1169
1170         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1171
1172         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1173                         sdata->name, bssid, reason_code);
1174
1175         ieee80211_set_disassoc(sdata, true);
1176         ieee80211_recalc_idle(sdata->local);
1177
1178         return RX_MGMT_CFG80211_DEAUTH;
1179 }
1180
1181
1182 static enum rx_mgmt_action __must_check
1183 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1184                            struct ieee80211_mgmt *mgmt, size_t len)
1185 {
1186         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1187         u16 reason_code;
1188
1189         if (len < 24 + 2)
1190                 return RX_MGMT_NONE;
1191
1192         ASSERT_MGD_MTX(ifmgd);
1193
1194         if (WARN_ON(!ifmgd->associated))
1195                 return RX_MGMT_NONE;
1196
1197         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1198                 return RX_MGMT_NONE;
1199
1200         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1201
1202         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1203                         sdata->name, mgmt->sa, reason_code);
1204
1205         ieee80211_set_disassoc(sdata, true);
1206         ieee80211_recalc_idle(sdata->local);
1207         return RX_MGMT_CFG80211_DISASSOC;
1208 }
1209
1210
1211 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1212                                     struct ieee80211_mgmt *mgmt, size_t len)
1213 {
1214         struct ieee80211_sub_if_data *sdata = wk->sdata;
1215         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1216         struct ieee80211_local *local = sdata->local;
1217         struct ieee80211_supported_band *sband;
1218         struct sta_info *sta;
1219         struct cfg80211_bss *cbss = wk->assoc.bss;
1220         u8 *pos;
1221         u32 rates, basic_rates;
1222         u16 capab_info, aid;
1223         struct ieee802_11_elems elems;
1224         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1225         u32 changed = 0;
1226         int i, j, err;
1227         bool have_higher_than_11mbit = false;
1228         u16 ap_ht_cap_flags;
1229
1230         /* AssocResp and ReassocResp have identical structure */
1231
1232         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1233         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1234
1235         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1236                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1237                        "set\n", sdata->name, aid);
1238         aid &= ~(BIT(15) | BIT(14));
1239
1240         pos = mgmt->u.assoc_resp.variable;
1241         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1242
1243         if (!elems.supp_rates) {
1244                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1245                        sdata->name);
1246                 return false;
1247         }
1248
1249         ifmgd->aid = aid;
1250
1251         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1252         if (!sta) {
1253                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1254                        " the AP\n", sdata->name);
1255                 return false;
1256         }
1257
1258         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1259                            WLAN_STA_ASSOC_AP);
1260         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1261                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1262
1263         rates = 0;
1264         basic_rates = 0;
1265         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1266
1267         for (i = 0; i < elems.supp_rates_len; i++) {
1268                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1269                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1270
1271                 if (rate > 110)
1272                         have_higher_than_11mbit = true;
1273
1274                 for (j = 0; j < sband->n_bitrates; j++) {
1275                         if (sband->bitrates[j].bitrate == rate) {
1276                                 rates |= BIT(j);
1277                                 if (is_basic)
1278                                         basic_rates |= BIT(j);
1279                                 break;
1280                         }
1281                 }
1282         }
1283
1284         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1285                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1286                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1287
1288                 if (rate > 110)
1289                         have_higher_than_11mbit = true;
1290
1291                 for (j = 0; j < sband->n_bitrates; j++) {
1292                         if (sband->bitrates[j].bitrate == rate) {
1293                                 rates |= BIT(j);
1294                                 if (is_basic)
1295                                         basic_rates |= BIT(j);
1296                                 break;
1297                         }
1298                 }
1299         }
1300
1301         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1302         sdata->vif.bss_conf.basic_rates = basic_rates;
1303
1304         /* cf. IEEE 802.11 9.2.12 */
1305         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1306             have_higher_than_11mbit)
1307                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1308         else
1309                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1310
1311         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1312                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1313                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1314
1315         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1316
1317         rate_control_rate_init(sta);
1318
1319         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1320                 set_sta_flags(sta, WLAN_STA_MFP);
1321
1322         if (elems.wmm_param)
1323                 set_sta_flags(sta, WLAN_STA_WME);
1324
1325         err = sta_info_insert(sta);
1326         sta = NULL;
1327         if (err) {
1328                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1329                        " the AP (error %d)\n", sdata->name, err);
1330                 return false;
1331         }
1332
1333         if (elems.wmm_param)
1334                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1335                                          elems.wmm_param_len);
1336         else
1337                 ieee80211_set_wmm_default(sdata);
1338
1339         local->oper_channel = wk->chan;
1340
1341         if (elems.ht_info_elem && elems.wmm_param &&
1342             (sdata->local->hw.queues >= 4) &&
1343             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1344                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1345                                                cbss->bssid, ap_ht_cap_flags);
1346
1347         /* set AID and assoc capability,
1348          * ieee80211_set_associated() will tell the driver */
1349         bss_conf->aid = aid;
1350         bss_conf->assoc_capability = capab_info;
1351         ieee80211_set_associated(sdata, cbss, changed);
1352
1353         /*
1354          * If we're using 4-addr mode, let the AP know that we're
1355          * doing so, so that it can create the STA VLAN on its side
1356          */
1357         if (ifmgd->use_4addr)
1358                 ieee80211_send_4addr_nullfunc(local, sdata);
1359
1360         /*
1361          * Start timer to probe the connection to the AP now.
1362          * Also start the timer that will detect beacon loss.
1363          */
1364         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1365         mod_beacon_timer(sdata);
1366
1367         return true;
1368 }
1369
1370
1371 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1372                                   struct ieee80211_mgmt *mgmt,
1373                                   size_t len,
1374                                   struct ieee80211_rx_status *rx_status,
1375                                   struct ieee802_11_elems *elems,
1376                                   bool beacon)
1377 {
1378         struct ieee80211_local *local = sdata->local;
1379         int freq;
1380         struct ieee80211_bss *bss;
1381         struct ieee80211_channel *channel;
1382         bool need_ps = false;
1383
1384         if (sdata->u.mgd.associated) {
1385                 bss = (void *)sdata->u.mgd.associated->priv;
1386                 /* not previously set so we may need to recalc */
1387                 need_ps = !bss->dtim_period;
1388         }
1389
1390         if (elems->ds_params && elems->ds_params_len == 1)
1391                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1392         else
1393                 freq = rx_status->freq;
1394
1395         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1396
1397         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1398                 return;
1399
1400         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1401                                         channel, beacon);
1402         if (bss)
1403                 ieee80211_rx_bss_put(local, bss);
1404
1405         if (!sdata->u.mgd.associated)
1406                 return;
1407
1408         if (need_ps) {
1409                 mutex_lock(&local->iflist_mtx);
1410                 ieee80211_recalc_ps(local, -1);
1411                 mutex_unlock(&local->iflist_mtx);
1412         }
1413
1414         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1415             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1416                                                         ETH_ALEN) == 0)) {
1417                 struct ieee80211_channel_sw_ie *sw_elem =
1418                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1419                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1420                                                  bss, rx_status->mactime);
1421         }
1422 }
1423
1424
1425 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1426                                          struct sk_buff *skb)
1427 {
1428         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1429         struct ieee80211_if_managed *ifmgd;
1430         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1431         size_t baselen, len = skb->len;
1432         struct ieee802_11_elems elems;
1433
1434         ifmgd = &sdata->u.mgd;
1435
1436         ASSERT_MGD_MTX(ifmgd);
1437
1438         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1439                 return; /* ignore ProbeResp to foreign address */
1440
1441         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1442         if (baselen > len)
1443                 return;
1444
1445         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1446                                 &elems);
1447
1448         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1449
1450         if (ifmgd->associated &&
1451             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1452             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1453                             IEEE80211_STA_CONNECTION_POLL)) {
1454                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1455                                   IEEE80211_STA_BEACON_POLL);
1456                 mutex_lock(&sdata->local->iflist_mtx);
1457                 ieee80211_recalc_ps(sdata->local, -1);
1458                 mutex_unlock(&sdata->local->iflist_mtx);
1459
1460                 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1461                         return;
1462
1463                 /*
1464                  * We've received a probe response, but are not sure whether
1465                  * we have or will be receiving any beacons or data, so let's
1466                  * schedule the timers again, just in case.
1467                  */
1468                 mod_beacon_timer(sdata);
1469
1470                 mod_timer(&ifmgd->conn_mon_timer,
1471                           round_jiffies_up(jiffies +
1472                                            IEEE80211_CONNECTION_IDLE_TIME));
1473         }
1474 }
1475
1476 /*
1477  * This is the canonical list of information elements we care about,
1478  * the filter code also gives us all changes to the Microsoft OUI
1479  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1480  *
1481  * We implement beacon filtering in software since that means we can
1482  * avoid processing the frame here and in cfg80211, and userspace
1483  * will not be able to tell whether the hardware supports it or not.
1484  *
1485  * XXX: This list needs to be dynamic -- userspace needs to be able to
1486  *      add items it requires. It also needs to be able to tell us to
1487  *      look out for other vendor IEs.
1488  */
1489 static const u64 care_about_ies =
1490         (1ULL << WLAN_EID_COUNTRY) |
1491         (1ULL << WLAN_EID_ERP_INFO) |
1492         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1493         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1494         (1ULL << WLAN_EID_HT_CAPABILITY) |
1495         (1ULL << WLAN_EID_HT_INFORMATION);
1496
1497 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1498                                      struct ieee80211_mgmt *mgmt,
1499                                      size_t len,
1500                                      struct ieee80211_rx_status *rx_status)
1501 {
1502         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1503         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1504         size_t baselen;
1505         struct ieee802_11_elems elems;
1506         struct ieee80211_local *local = sdata->local;
1507         u32 changed = 0;
1508         bool erp_valid, directed_tim = false;
1509         u8 erp_value = 0;
1510         u32 ncrc;
1511         u8 *bssid;
1512
1513         ASSERT_MGD_MTX(ifmgd);
1514
1515         /* Process beacon from the current BSS */
1516         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1517         if (baselen > len)
1518                 return;
1519
1520         if (rx_status->freq != local->hw.conf.channel->center_freq)
1521                 return;
1522
1523         /*
1524          * We might have received a number of frames, among them a
1525          * disassoc frame and a beacon...
1526          */
1527         if (!ifmgd->associated)
1528                 return;
1529
1530         bssid = ifmgd->associated->bssid;
1531
1532         /*
1533          * And in theory even frames from a different AP we were just
1534          * associated to a split-second ago!
1535          */
1536         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1537                 return;
1538
1539         /* Track average RSSI from the Beacon frames of the current AP */
1540         ifmgd->last_beacon_signal = rx_status->signal;
1541         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1542                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1543                 ifmgd->ave_beacon_signal = rx_status->signal;
1544                 ifmgd->last_cqm_event_signal = 0;
1545         } else {
1546                 ifmgd->ave_beacon_signal =
1547                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1548                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1549                          ifmgd->ave_beacon_signal) / 16;
1550         }
1551         if (bss_conf->cqm_rssi_thold &&
1552             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1553                 int sig = ifmgd->ave_beacon_signal / 16;
1554                 int last_event = ifmgd->last_cqm_event_signal;
1555                 int thold = bss_conf->cqm_rssi_thold;
1556                 int hyst = bss_conf->cqm_rssi_hyst;
1557                 if (sig < thold &&
1558                     (last_event == 0 || sig < last_event - hyst)) {
1559                         ifmgd->last_cqm_event_signal = sig;
1560                         ieee80211_cqm_rssi_notify(
1561                                 &sdata->vif,
1562                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1563                                 GFP_KERNEL);
1564                 } else if (sig > thold &&
1565                            (last_event == 0 || sig > last_event + hyst)) {
1566                         ifmgd->last_cqm_event_signal = sig;
1567                         ieee80211_cqm_rssi_notify(
1568                                 &sdata->vif,
1569                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1570                                 GFP_KERNEL);
1571                 }
1572         }
1573
1574         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1575 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1576                 if (net_ratelimit()) {
1577                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1578                                "to a received beacon\n", sdata->name);
1579                 }
1580 #endif
1581                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1582                 mutex_lock(&local->iflist_mtx);
1583                 ieee80211_recalc_ps(local, -1);
1584                 mutex_unlock(&local->iflist_mtx);
1585         }
1586
1587         /*
1588          * Push the beacon loss detection into the future since
1589          * we are processing a beacon from the AP just now.
1590          */
1591         mod_beacon_timer(sdata);
1592
1593         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1594         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1595                                           len - baselen, &elems,
1596                                           care_about_ies, ncrc);
1597
1598         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1599                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1600                                                    ifmgd->aid);
1601
1602         if (ncrc != ifmgd->beacon_crc) {
1603                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1604                                       true);
1605
1606                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1607                                          elems.wmm_param_len);
1608         }
1609
1610         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1611                 if (directed_tim) {
1612                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1613                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1614                                 ieee80211_hw_config(local,
1615                                                     IEEE80211_CONF_CHANGE_PS);
1616                                 ieee80211_send_nullfunc(local, sdata, 0);
1617                         } else {
1618                                 local->pspolling = true;
1619
1620                                 /*
1621                                  * Here is assumed that the driver will be
1622                                  * able to send ps-poll frame and receive a
1623                                  * response even though power save mode is
1624                                  * enabled, but some drivers might require
1625                                  * to disable power save here. This needs
1626                                  * to be investigated.
1627                                  */
1628                                 ieee80211_send_pspoll(local, sdata);
1629                         }
1630                 }
1631         }
1632
1633         if (ncrc == ifmgd->beacon_crc)
1634                 return;
1635         ifmgd->beacon_crc = ncrc;
1636
1637         if (elems.erp_info && elems.erp_info_len >= 1) {
1638                 erp_valid = true;
1639                 erp_value = elems.erp_info[0];
1640         } else {
1641                 erp_valid = false;
1642         }
1643         changed |= ieee80211_handle_bss_capability(sdata,
1644                         le16_to_cpu(mgmt->u.beacon.capab_info),
1645                         erp_valid, erp_value);
1646
1647
1648         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1649             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1650                 struct sta_info *sta;
1651                 struct ieee80211_supported_band *sband;
1652                 u16 ap_ht_cap_flags;
1653
1654                 rcu_read_lock();
1655
1656                 sta = sta_info_get(sdata, bssid);
1657                 if (WARN_ON(!sta)) {
1658                         rcu_read_unlock();
1659                         return;
1660                 }
1661
1662                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1663
1664                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1665                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1666
1667                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1668
1669                 rcu_read_unlock();
1670
1671                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1672                                                bssid, ap_ht_cap_flags);
1673         }
1674
1675         /* Note: country IE parsing is done for us by cfg80211 */
1676         if (elems.country_elem) {
1677                 /* TODO: IBSS also needs this */
1678                 if (elems.pwr_constr_elem)
1679                         ieee80211_handle_pwr_constr(sdata,
1680                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1681                                 elems.pwr_constr_elem,
1682                                 elems.pwr_constr_elem_len);
1683         }
1684
1685         ieee80211_bss_info_change_notify(sdata, changed);
1686 }
1687
1688 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1689                                   struct sk_buff *skb)
1690 {
1691         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1692         struct ieee80211_rx_status *rx_status;
1693         struct ieee80211_mgmt *mgmt;
1694         enum rx_mgmt_action rma = RX_MGMT_NONE;
1695         u16 fc;
1696
1697         rx_status = (struct ieee80211_rx_status *) skb->cb;
1698         mgmt = (struct ieee80211_mgmt *) skb->data;
1699         fc = le16_to_cpu(mgmt->frame_control);
1700
1701         mutex_lock(&ifmgd->mtx);
1702
1703         if (ifmgd->associated &&
1704             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1705                 switch (fc & IEEE80211_FCTL_STYPE) {
1706                 case IEEE80211_STYPE_BEACON:
1707                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1708                                                  rx_status);
1709                         break;
1710                 case IEEE80211_STYPE_PROBE_RESP:
1711                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1712                         break;
1713                 case IEEE80211_STYPE_DEAUTH:
1714                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1715                         break;
1716                 case IEEE80211_STYPE_DISASSOC:
1717                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1718                         break;
1719                 case IEEE80211_STYPE_ACTION:
1720                         switch (mgmt->u.action.category) {
1721                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1722                                 ieee80211_sta_process_chanswitch(sdata,
1723                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1724                                                 (void *)ifmgd->associated->priv,
1725                                                 rx_status->mactime);
1726                                 break;
1727                         }
1728                 }
1729                 mutex_unlock(&ifmgd->mtx);
1730
1731                 switch (rma) {
1732                 case RX_MGMT_NONE:
1733                         /* no action */
1734                         break;
1735                 case RX_MGMT_CFG80211_DEAUTH:
1736                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1737                         break;
1738                 case RX_MGMT_CFG80211_DISASSOC:
1739                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1740                         break;
1741                 default:
1742                         WARN(1, "unexpected: %d", rma);
1743                 }
1744                 return;
1745         }
1746
1747         mutex_unlock(&ifmgd->mtx);
1748
1749         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1750             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1751                 struct ieee80211_local *local = sdata->local;
1752                 struct ieee80211_work *wk;
1753
1754                 mutex_lock(&local->work_mtx);
1755                 list_for_each_entry(wk, &local->work_list, list) {
1756                         if (wk->sdata != sdata)
1757                                 continue;
1758
1759                         if (wk->type != IEEE80211_WORK_ASSOC &&
1760                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1761                                 continue;
1762
1763                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1764                                 continue;
1765                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1766                                 continue;
1767
1768                         /*
1769                          * Printing the message only here means we can't
1770                          * spuriously print it, but it also means that it
1771                          * won't be printed when the frame comes in before
1772                          * we even tried to associate or in similar cases.
1773                          *
1774                          * Ultimately, I suspect cfg80211 should print the
1775                          * messages instead.
1776                          */
1777                         printk(KERN_DEBUG
1778                                "%s: deauthenticated from %pM (Reason: %u)\n",
1779                                sdata->name, mgmt->bssid,
1780                                le16_to_cpu(mgmt->u.deauth.reason_code));
1781
1782                         list_del_rcu(&wk->list);
1783                         free_work(wk);
1784                         break;
1785                 }
1786                 mutex_unlock(&local->work_mtx);
1787
1788                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1789         }
1790 }
1791
1792 static void ieee80211_sta_timer(unsigned long data)
1793 {
1794         struct ieee80211_sub_if_data *sdata =
1795                 (struct ieee80211_sub_if_data *) data;
1796         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1797         struct ieee80211_local *local = sdata->local;
1798
1799         if (local->quiescing) {
1800                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1801                 return;
1802         }
1803
1804         ieee80211_queue_work(&local->hw, &sdata->work);
1805 }
1806
1807 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
1808 {
1809         struct ieee80211_local *local = sdata->local;
1810         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1811
1812         /* then process the rest of the work */
1813         mutex_lock(&ifmgd->mtx);
1814
1815         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1816                             IEEE80211_STA_CONNECTION_POLL) &&
1817             ifmgd->associated) {
1818                 u8 bssid[ETH_ALEN];
1819
1820                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1821                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1822                         run_again(ifmgd, ifmgd->probe_timeout);
1823
1824                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1825 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1826                         printk(KERN_DEBUG "No probe response from AP %pM"
1827                                 " after %dms, try %d\n", bssid,
1828                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1829                                 ifmgd->probe_send_count);
1830 #endif
1831                         ieee80211_mgd_probe_ap_send(sdata);
1832                 } else {
1833                         /*
1834                          * We actually lost the connection ... or did we?
1835                          * Let's make sure!
1836                          */
1837                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1838                                           IEEE80211_STA_BEACON_POLL);
1839                         printk(KERN_DEBUG "No probe response from AP %pM"
1840                                 " after %dms, disconnecting.\n",
1841                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1842                         ieee80211_set_disassoc(sdata, true);
1843                         ieee80211_recalc_idle(local);
1844                         mutex_unlock(&ifmgd->mtx);
1845                         /*
1846                          * must be outside lock due to cfg80211,
1847                          * but that's not a problem.
1848                          */
1849                         ieee80211_send_deauth_disassoc(sdata, bssid,
1850                                         IEEE80211_STYPE_DEAUTH,
1851                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1852                                         NULL, true);
1853                         mutex_lock(&ifmgd->mtx);
1854                 }
1855         }
1856
1857         mutex_unlock(&ifmgd->mtx);
1858 }
1859
1860 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1861 {
1862         struct ieee80211_sub_if_data *sdata =
1863                 (struct ieee80211_sub_if_data *) data;
1864         struct ieee80211_local *local = sdata->local;
1865
1866         if (local->quiescing)
1867                 return;
1868
1869         ieee80211_queue_work(&sdata->local->hw,
1870                              &sdata->u.mgd.beacon_connection_loss_work);
1871 }
1872
1873 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1874 {
1875         struct ieee80211_sub_if_data *sdata =
1876                 (struct ieee80211_sub_if_data *) data;
1877         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1878         struct ieee80211_local *local = sdata->local;
1879
1880         if (local->quiescing)
1881                 return;
1882
1883         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1884 }
1885
1886 static void ieee80211_sta_monitor_work(struct work_struct *work)
1887 {
1888         struct ieee80211_sub_if_data *sdata =
1889                 container_of(work, struct ieee80211_sub_if_data,
1890                              u.mgd.monitor_work);
1891
1892         ieee80211_mgd_probe_ap(sdata, false);
1893 }
1894
1895 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1896 {
1897         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1898                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1899                                         IEEE80211_STA_CONNECTION_POLL);
1900
1901                 /* let's probe the connection once */
1902                 ieee80211_queue_work(&sdata->local->hw,
1903                            &sdata->u.mgd.monitor_work);
1904                 /* and do all the other regular work too */
1905                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1906         }
1907 }
1908
1909 #ifdef CONFIG_PM
1910 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1911 {
1912         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1913
1914         /*
1915          * we need to use atomic bitops for the running bits
1916          * only because both timers might fire at the same
1917          * time -- the code here is properly synchronised.
1918          */
1919
1920         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1921         if (del_timer_sync(&ifmgd->timer))
1922                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1923
1924         cancel_work_sync(&ifmgd->chswitch_work);
1925         if (del_timer_sync(&ifmgd->chswitch_timer))
1926                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1927
1928         cancel_work_sync(&ifmgd->monitor_work);
1929         /* these will just be re-established on connection */
1930         del_timer_sync(&ifmgd->conn_mon_timer);
1931         del_timer_sync(&ifmgd->bcn_mon_timer);
1932 }
1933
1934 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1935 {
1936         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1937
1938         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1939                 add_timer(&ifmgd->timer);
1940         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1941                 add_timer(&ifmgd->chswitch_timer);
1942 }
1943 #endif
1944
1945 /* interface setup */
1946 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1947 {
1948         struct ieee80211_if_managed *ifmgd;
1949
1950         ifmgd = &sdata->u.mgd;
1951         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1952         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1953         INIT_WORK(&ifmgd->beacon_connection_loss_work,
1954                   ieee80211_beacon_connection_loss_work);
1955         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1956                     (unsigned long) sdata);
1957         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1958                     (unsigned long) sdata);
1959         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1960                     (unsigned long) sdata);
1961         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1962                     (unsigned long) sdata);
1963
1964         ifmgd->flags = 0;
1965
1966         mutex_init(&ifmgd->mtx);
1967
1968         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1969                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1970         else
1971                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1972 }
1973
1974 /* scan finished notification */
1975 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1976 {
1977         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1978
1979         /* Restart STA timers */
1980         rcu_read_lock();
1981         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1982                 ieee80211_restart_sta_timer(sdata);
1983         rcu_read_unlock();
1984 }
1985
1986 int ieee80211_max_network_latency(struct notifier_block *nb,
1987                                   unsigned long data, void *dummy)
1988 {
1989         s32 latency_usec = (s32) data;
1990         struct ieee80211_local *local =
1991                 container_of(nb, struct ieee80211_local,
1992                              network_latency_notifier);
1993
1994         mutex_lock(&local->iflist_mtx);
1995         ieee80211_recalc_ps(local, latency_usec);
1996         mutex_unlock(&local->iflist_mtx);
1997
1998         return 0;
1999 }
2000
2001 /* config hooks */
2002 static enum work_done_result
2003 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2004                           struct sk_buff *skb)
2005 {
2006         if (!skb) {
2007                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2008                 return WORK_DONE_DESTROY;
2009         }
2010
2011         if (wk->type == IEEE80211_WORK_AUTH) {
2012                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2013                 return WORK_DONE_DESTROY;
2014         }
2015
2016         mutex_lock(&wk->sdata->u.mgd.mtx);
2017         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2018         mutex_unlock(&wk->sdata->u.mgd.mtx);
2019
2020         wk->type = IEEE80211_WORK_AUTH;
2021         wk->probe_auth.tries = 0;
2022         return WORK_DONE_REQUEUE;
2023 }
2024
2025 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2026                        struct cfg80211_auth_request *req)
2027 {
2028         const u8 *ssid;
2029         struct ieee80211_work *wk;
2030         u16 auth_alg;
2031
2032         if (req->local_state_change)
2033                 return 0; /* no need to update mac80211 state */
2034
2035         switch (req->auth_type) {
2036         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2037                 auth_alg = WLAN_AUTH_OPEN;
2038                 break;
2039         case NL80211_AUTHTYPE_SHARED_KEY:
2040                 if (IS_ERR(sdata->local->wep_tx_tfm))
2041                         return -EOPNOTSUPP;
2042                 auth_alg = WLAN_AUTH_SHARED_KEY;
2043                 break;
2044         case NL80211_AUTHTYPE_FT:
2045                 auth_alg = WLAN_AUTH_FT;
2046                 break;
2047         case NL80211_AUTHTYPE_NETWORK_EAP:
2048                 auth_alg = WLAN_AUTH_LEAP;
2049                 break;
2050         default:
2051                 return -EOPNOTSUPP;
2052         }
2053
2054         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2055         if (!wk)
2056                 return -ENOMEM;
2057
2058         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2059
2060         if (req->ie && req->ie_len) {
2061                 memcpy(wk->ie, req->ie, req->ie_len);
2062                 wk->ie_len = req->ie_len;
2063         }
2064
2065         if (req->key && req->key_len) {
2066                 wk->probe_auth.key_len = req->key_len;
2067                 wk->probe_auth.key_idx = req->key_idx;
2068                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2069         }
2070
2071         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2072         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2073         wk->probe_auth.ssid_len = ssid[1];
2074
2075         wk->probe_auth.algorithm = auth_alg;
2076         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2077
2078         /* if we already have a probe, don't probe again */
2079         if (req->bss->proberesp_ies)
2080                 wk->type = IEEE80211_WORK_AUTH;
2081         else
2082                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2083         wk->chan = req->bss->channel;
2084         wk->sdata = sdata;
2085         wk->done = ieee80211_probe_auth_done;
2086
2087         ieee80211_add_work(wk);
2088         return 0;
2089 }
2090
2091 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2092                                                   struct sk_buff *skb)
2093 {
2094         struct ieee80211_mgmt *mgmt;
2095         struct ieee80211_rx_status *rx_status;
2096         struct ieee802_11_elems elems;
2097         u16 status;
2098
2099         if (!skb) {
2100                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2101                 return WORK_DONE_DESTROY;
2102         }
2103
2104         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2105                 mutex_lock(&wk->sdata->u.mgd.mtx);
2106                 rx_status = (void *) skb->cb;
2107                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2108                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2109                                       &elems, true);
2110                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2111
2112                 wk->type = IEEE80211_WORK_ASSOC;
2113                 /* not really done yet */
2114                 return WORK_DONE_REQUEUE;
2115         }
2116
2117         mgmt = (void *)skb->data;
2118         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2119
2120         if (status == WLAN_STATUS_SUCCESS) {
2121                 mutex_lock(&wk->sdata->u.mgd.mtx);
2122                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2123                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2124                         /* oops -- internal error -- send timeout for now */
2125                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2126                                                     wk->filter_ta);
2127                         return WORK_DONE_DESTROY;
2128                 }
2129
2130                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2131         }
2132
2133         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2134         return WORK_DONE_DESTROY;
2135 }
2136
2137 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2138                         struct cfg80211_assoc_request *req)
2139 {
2140         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2141         struct ieee80211_bss *bss = (void *)req->bss->priv;
2142         struct ieee80211_work *wk;
2143         const u8 *ssid;
2144         int i;
2145
2146         mutex_lock(&ifmgd->mtx);
2147         if (ifmgd->associated) {
2148                 if (!req->prev_bssid ||
2149                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2150                            ETH_ALEN)) {
2151                         /*
2152                          * We are already associated and the request was not a
2153                          * reassociation request from the current BSS, so
2154                          * reject it.
2155                          */
2156                         mutex_unlock(&ifmgd->mtx);
2157                         return -EALREADY;
2158                 }
2159
2160                 /* Trying to reassociate - clear previous association state */
2161                 ieee80211_set_disassoc(sdata, true);
2162         }
2163         mutex_unlock(&ifmgd->mtx);
2164
2165         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2166         if (!wk)
2167                 return -ENOMEM;
2168
2169         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2170         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2171
2172         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2173                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2174                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2175                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2176                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2177
2178
2179         if (req->ie && req->ie_len) {
2180                 memcpy(wk->ie, req->ie, req->ie_len);
2181                 wk->ie_len = req->ie_len;
2182         } else
2183                 wk->ie_len = 0;
2184
2185         wk->assoc.bss = req->bss;
2186
2187         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2188
2189         /* new association always uses requested smps mode */
2190         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2191                 if (ifmgd->powersave)
2192                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2193                 else
2194                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2195         } else
2196                 ifmgd->ap_smps = ifmgd->req_smps;
2197
2198         wk->assoc.smps = ifmgd->ap_smps;
2199         /*
2200          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2201          * We still associate in non-HT mode (11a/b/g) if any one of these
2202          * ciphers is configured as pairwise.
2203          * We can set this to true for non-11n hardware, that'll be checked
2204          * separately along with the peer capabilities.
2205          */
2206         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2207         wk->assoc.capability = req->bss->capability;
2208         wk->assoc.wmm_used = bss->wmm_used;
2209         wk->assoc.supp_rates = bss->supp_rates;
2210         wk->assoc.supp_rates_len = bss->supp_rates_len;
2211         wk->assoc.ht_information_ie =
2212                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2213
2214         if (bss->wmm_used && bss->uapsd_supported &&
2215             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2216                 wk->assoc.uapsd_used = true;
2217                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2218         } else {
2219                 wk->assoc.uapsd_used = false;
2220                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2221         }
2222
2223         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2224         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2225         wk->assoc.ssid_len = ssid[1];
2226
2227         if (req->prev_bssid)
2228                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2229
2230         wk->chan = req->bss->channel;
2231         wk->sdata = sdata;
2232         wk->done = ieee80211_assoc_done;
2233         if (!bss->dtim_period &&
2234             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2235                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2236         else
2237                 wk->type = IEEE80211_WORK_ASSOC;
2238
2239         if (req->use_mfp) {
2240                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2241                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2242         } else {
2243                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2244                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2245         }
2246
2247         if (req->crypto.control_port)
2248                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2249         else
2250                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2251
2252         ieee80211_add_work(wk);
2253         return 0;
2254 }
2255
2256 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2257                          struct cfg80211_deauth_request *req,
2258                          void *cookie)
2259 {
2260         struct ieee80211_local *local = sdata->local;
2261         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2262         struct ieee80211_work *wk;
2263         u8 bssid[ETH_ALEN];
2264         bool assoc_bss = false;
2265
2266         mutex_lock(&ifmgd->mtx);
2267
2268         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2269         if (ifmgd->associated == req->bss) {
2270                 ieee80211_set_disassoc(sdata, false);
2271                 mutex_unlock(&ifmgd->mtx);
2272                 assoc_bss = true;
2273         } else {
2274                 bool not_auth_yet = false;
2275
2276                 mutex_unlock(&ifmgd->mtx);
2277
2278                 mutex_lock(&local->work_mtx);
2279                 list_for_each_entry(wk, &local->work_list, list) {
2280                         if (wk->sdata != sdata)
2281                                 continue;
2282
2283                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2284                             wk->type != IEEE80211_WORK_AUTH &&
2285                             wk->type != IEEE80211_WORK_ASSOC &&
2286                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2287                                 continue;
2288
2289                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2290                                 continue;
2291
2292                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2293                         list_del_rcu(&wk->list);
2294                         free_work(wk);
2295                         break;
2296                 }
2297                 mutex_unlock(&local->work_mtx);
2298
2299                 /*
2300                  * If somebody requests authentication and we haven't
2301                  * sent out an auth frame yet there's no need to send
2302                  * out a deauth frame either. If the state was PROBE,
2303                  * then this is the case. If it's AUTH we have sent a
2304                  * frame, and if it's IDLE we have completed the auth
2305                  * process already.
2306                  */
2307                 if (not_auth_yet) {
2308                         __cfg80211_auth_canceled(sdata->dev, bssid);
2309                         return 0;
2310                 }
2311         }
2312
2313         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2314                sdata->name, bssid, req->reason_code);
2315
2316         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2317                                        req->reason_code, cookie,
2318                                        !req->local_state_change);
2319         if (assoc_bss)
2320                 sta_info_destroy_addr(sdata, bssid);
2321
2322         ieee80211_recalc_idle(sdata->local);
2323
2324         return 0;
2325 }
2326
2327 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2328                            struct cfg80211_disassoc_request *req,
2329                            void *cookie)
2330 {
2331         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2332         u8 bssid[ETH_ALEN];
2333
2334         mutex_lock(&ifmgd->mtx);
2335
2336         /*
2337          * cfg80211 should catch this ... but it's racy since
2338          * we can receive a disassoc frame, process it, hand it
2339          * to cfg80211 while that's in a locked section already
2340          * trying to tell us that the user wants to disconnect.
2341          */
2342         if (ifmgd->associated != req->bss) {
2343                 mutex_unlock(&ifmgd->mtx);
2344                 return -ENOLINK;
2345         }
2346
2347         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2348                sdata->name, req->bss->bssid, req->reason_code);
2349
2350         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2351         ieee80211_set_disassoc(sdata, false);
2352
2353         mutex_unlock(&ifmgd->mtx);
2354
2355         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2356                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2357                         cookie, !req->local_state_change);
2358         sta_info_destroy_addr(sdata, bssid);
2359
2360         ieee80211_recalc_idle(sdata->local);
2361
2362         return 0;
2363 }
2364
2365 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2366                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2367                                gfp_t gfp)
2368 {
2369         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2370
2371         trace_api_cqm_rssi_notify(sdata, rssi_event);
2372
2373         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2374 }
2375 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);