net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/pm_qos_params.h>
  21 #include <linux/crc32.h>
  22 #include <linux/slab.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "driver-ops.h"
  28 #include "rate.h"
  29 #include "led.h"
  30
  31 #define IEEE80211_MAX_PROBE_TRIES 5
  32
  33 /*
  34  * beacon loss detection timeout
  35  * XXX: should depend on beacon interval
  36  */
  37 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
  38 /*
  39  * Time the connection can be idle before we probe
  40  * it to see if we can still talk to the AP.
  41  */
  42 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  43 /*
  44  * Time we wait for a probe response after sending
  45  * a probe request because of beacon loss or for
  46  * checking the connection still works.
  47  */
  48 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  49
  50 /*
  51  * Weight given to the latest Beacon frame when calculating average signal
  52  * strength for Beacon frames received in the current BSS. This must be
  53  * between 1 and 15.
  54  */
  55 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  56
  57 #define TMR_RUNNING_TIMER       0
  58 #define TMR_RUNNING_CHANSW      1
  59
  60 /*
  61  * All cfg80211 functions have to be called outside a locked
  62  * section so that they can acquire a lock themselves... This
  63  * is much simpler than queuing up things in cfg80211, but we
  64  * do need some indirection for that here.
  65  */
  66 enum rx_mgmt_action {
  67         /* no action required */
  68         RX_MGMT_NONE,
  69
  70         /* caller must call cfg80211_send_rx_auth() */
  71         RX_MGMT_CFG80211_AUTH,
  72
  73         /* caller must call cfg80211_send_rx_assoc() */
  74         RX_MGMT_CFG80211_ASSOC,
  75
  76         /* caller must call cfg80211_send_deauth() */
  77         RX_MGMT_CFG80211_DEAUTH,
  78
  79         /* caller must call cfg80211_send_disassoc() */
  80         RX_MGMT_CFG80211_DISASSOC,
  81
  82         /* caller must tell cfg80211 about internal error */
  83         RX_MGMT_CFG80211_ASSOC_ERROR,
  84 };
  85
  86 /* utils */
  87 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  88 {
  89         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  90 }
  91
  92 /*
  93  * We can have multiple work items (and connection probing)
  94  * scheduling this timer, but we need to take care to only
  95  * reschedule it when it should fire _earlier_ than it was
  96  * asked for before, or if it's not pending right now. This
  97  * function ensures that. Note that it then is required to
  98  * run this function for all timeouts after the first one
  99  * has happened -- the work that runs from this timer will
 100  * do that.
 101  */
 102 static void run_again(struct ieee80211_if_managed *ifmgd,
 103                              unsigned long timeout)
 104 {
 105         ASSERT_MGD_MTX(ifmgd);
 106
 107         if (!timer_pending(&ifmgd->timer) ||
 108             time_before(timeout, ifmgd->timer.expires))
 109                 mod_timer(&ifmgd->timer, timeout);
 110 }
 111
 112 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 113 {
 114         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 115                 return;
 116
 117         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 118                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 119 }
 120
 121 static int ecw2cw(int ecw)
 122 {
 123         return (1 << ecw) - 1;
 124 }
 125
 126 /*
 127  * ieee80211_enable_ht should be called only after the operating band
 128  * has been determined as ht configuration depends on the hw's
 129  * HT abilities for a specific band.
 130  */
 131 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 132                                struct ieee80211_ht_info *hti,
 133                                const u8 *bssid, u16 ap_ht_cap_flags)
 134 {
 135         struct ieee80211_local *local = sdata->local;
 136         struct ieee80211_supported_band *sband;
 137         struct sta_info *sta;
 138         u32 changed = 0;
 139         u16 ht_opmode;
 140         bool enable_ht = true;
 141         enum nl80211_channel_type prev_chantype;
 142         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 143
 144         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 145
 146         prev_chantype = sdata->vif.bss_conf.channel_type;
 147
 148         /* HT is not supported */
 149         if (!sband->ht_cap.ht_supported)
 150                 enable_ht = false;
 151
 152         /* check that channel matches the right operating channel */
 153         if (local->hw.conf.channel->center_freq !=
 154             ieee80211_channel_to_frequency(hti->control_chan))
 155                 enable_ht = false;
 156
 157         if (enable_ht) {
 158                 channel_type = NL80211_CHAN_HT20;
 159
 160                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 161                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 162                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 163                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 164                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 165                                 if (!(local->hw.conf.channel->flags &
 166                                     IEEE80211_CHAN_NO_HT40PLUS))
 167                                         channel_type = NL80211_CHAN_HT40PLUS;
 168                                 break;
 169                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 170                                 if (!(local->hw.conf.channel->flags &
 171                                     IEEE80211_CHAN_NO_HT40MINUS))
 172                                         channel_type = NL80211_CHAN_HT40MINUS;
 173                                 break;
 174                         }
 175                 }
 176         }
 177
 178         if (local->tmp_channel)
 179                 local->tmp_channel_type = channel_type;
 180
 181         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 182                 /* can only fail due to HT40+/- mismatch */
 183                 channel_type = NL80211_CHAN_HT20;
 184                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 185         }
 186
 187         /* channel_type change automatically detected */
 188         ieee80211_hw_config(local, 0);
 189
 190         if (prev_chantype != channel_type) {
 191                 rcu_read_lock();
 192                 sta = sta_info_get(sdata, bssid);
 193                 if (sta)
 194                         rate_control_rate_update(local, sband, sta,
 195                                                  IEEE80211_RC_HT_CHANGED,
 196                                                  channel_type);
 197                 rcu_read_unlock();
 198         }
 199
 200         ht_opmode = le16_to_cpu(hti->operation_mode);
 201
 202         /* if bss configuration changed store the new one */
 203         if (sdata->ht_opmode_valid != enable_ht ||
 204             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 205             prev_chantype != channel_type) {
 206                 changed |= BSS_CHANGED_HT;
 207                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 208                 sdata->ht_opmode_valid = enable_ht;
 209         }
 210
 211         return changed;
 212 }
 213
 214 /* frame sending functions */
 215
 216 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 217                                            const u8 *bssid, u16 stype, u16 reason,
 218                                            void *cookie, bool send_frame)
 219 {
 220         struct ieee80211_local *local = sdata->local;
 221         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 222         struct sk_buff *skb;
 223         struct ieee80211_mgmt *mgmt;
 224
 225         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 226         if (!skb) {
 227                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 228                        "deauth/disassoc frame\n", sdata->name);
 229                 return;
 230         }
 231         skb_reserve(skb, local->hw.extra_tx_headroom);
 232
 233         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 234         memset(mgmt, 0, 24);
 235         memcpy(mgmt->da, bssid, ETH_ALEN);
 236         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 237         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 238         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 239         skb_put(skb, 2);
 240         /* u.deauth.reason_code == u.disassoc.reason_code */
 241         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 242
 243         if (stype == IEEE80211_STYPE_DEAUTH)
 244                 if (cookie)
 245                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 246                 else
 247                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 248         else
 249                 if (cookie)
 250                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 251                 else
 252                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 253         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 254                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 255
 256         if (send_frame)
 257                 ieee80211_tx_skb(sdata, skb);
 258         else
 259                 kfree_skb(skb);
 260 }
 261
 262 void ieee80211_send_pspoll(struct ieee80211_local *local,
 263                            struct ieee80211_sub_if_data *sdata)
 264 {
 265         struct ieee80211_pspoll *pspoll;
 266         struct sk_buff *skb;
 267
 268         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 269         if (!skb)
 270                 return;
 271
 272         pspoll = (struct ieee80211_pspoll *) skb->data;
 273         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 274
 275         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 276         ieee80211_tx_skb(sdata, skb);
 277 }
 278
 279 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 280                              struct ieee80211_sub_if_data *sdata,
 281                              int powersave)
 282 {
 283         struct sk_buff *skb;
 284         struct ieee80211_hdr_3addr *nullfunc;
 285
 286         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 287         if (!skb)
 288                 return;
 289
 290         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 291         if (powersave)
 292                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 293
 294         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 295         ieee80211_tx_skb(sdata, skb);
 296 }
 297
 298 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 299                                           struct ieee80211_sub_if_data *sdata)
 300 {
 301         struct sk_buff *skb;
 302         struct ieee80211_hdr *nullfunc;
 303         __le16 fc;
 304
 305         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 306                 return;
 307
 308         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 309         if (!skb) {
 310                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 311                        "nullfunc frame\n", sdata->name);
 312                 return;
 313         }
 314         skb_reserve(skb, local->hw.extra_tx_headroom);
 315
 316         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 317         memset(nullfunc, 0, 30);
 318         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 319                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 320         nullfunc->frame_control = fc;
 321         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 322         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 323         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 324         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 325
 326         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 327         ieee80211_tx_skb(sdata, skb);
 328 }
 329
 330 /* spectrum management related things */
 331 static void ieee80211_chswitch_work(struct work_struct *work)
 332 {
 333         struct ieee80211_sub_if_data *sdata =
 334                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 335         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 336
 337         if (!ieee80211_sdata_running(sdata))
 338                 return;
 339
 340         mutex_lock(&ifmgd->mtx);
 341         if (!ifmgd->associated)
 342                 goto out;
 343
 344         sdata->local->oper_channel = sdata->local->csa_channel;
 345         if (!sdata->local->ops->channel_switch) {
 346                 /* call "hw_config" only if doing sw channel switch */
 347                 ieee80211_hw_config(sdata->local,
 348                         IEEE80211_CONF_CHANGE_CHANNEL);
 349         }
 350
 351         /* XXX: shouldn't really modify cfg80211-owned data! */
 352         ifmgd->associated->channel = sdata->local->oper_channel;
 353
 354         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 355                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 356  out:
 357         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 358         mutex_unlock(&ifmgd->mtx);
 359 }
 360
 361 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 362 {
 363         struct ieee80211_sub_if_data *sdata;
 364         struct ieee80211_if_managed *ifmgd;
 365
 366         sdata = vif_to_sdata(vif);
 367         ifmgd = &sdata->u.mgd;
 368
 369         trace_api_chswitch_done(sdata, success);
 370         if (!success) {
 371                 /*
 372                  * If the channel switch was not successful, stay
 373                  * around on the old channel. We currently lack
 374                  * good handling of this situation, possibly we
 375                  * should just drop the association.
 376                  */
 377                 sdata->local->csa_channel = sdata->local->oper_channel;
 378         }
 379
 380         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 381 }
 382 EXPORT_SYMBOL(ieee80211_chswitch_done);
 383
 384 static void ieee80211_chswitch_timer(unsigned long data)
 385 {
 386         struct ieee80211_sub_if_data *sdata =
 387                 (struct ieee80211_sub_if_data *) data;
 388         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 389
 390         if (sdata->local->quiescing) {
 391                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 392                 return;
 393         }
 394
 395         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 396 }
 397
 398 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 399                                       struct ieee80211_channel_sw_ie *sw_elem,
 400                                       struct ieee80211_bss *bss,
 401                                       u64 timestamp)
 402 {
 403         struct cfg80211_bss *cbss =
 404                 container_of((void *)bss, struct cfg80211_bss, priv);
 405         struct ieee80211_channel *new_ch;
 406         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 407         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 408
 409         ASSERT_MGD_MTX(ifmgd);
 410
 411         if (!ifmgd->associated)
 412                 return;
 413
 414         if (sdata->local->scanning)
 415                 return;
 416
 417         /* Disregard subsequent beacons if we are already running a timer
 418            processing a CSA */
 419
 420         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 421                 return;
 422
 423         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 424         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 425                 return;
 426
 427         sdata->local->csa_channel = new_ch;
 428
 429         if (sdata->local->ops->channel_switch) {
 430                 /* use driver's channel switch callback */
 431                 struct ieee80211_channel_switch ch_switch;
 432                 memset(&ch_switch, 0, sizeof(ch_switch));
 433                 ch_switch.timestamp = timestamp;
 434                 if (sw_elem->mode) {
 435                         ch_switch.block_tx = true;
 436                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 437                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 438                 }
 439                 ch_switch.channel = new_ch;
 440                 ch_switch.count = sw_elem->count;
 441                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 442                 drv_channel_switch(sdata->local, &ch_switch);
 443                 return;
 444         }
 445
 446         /* channel switch handled in software */
 447         if (sw_elem->count <= 1) {
 448                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 449         } else {
 450                 if (sw_elem->mode)
 451                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 452                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 453                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 454                 mod_timer(&ifmgd->chswitch_timer,
 455                           jiffies +
 456                           msecs_to_jiffies(sw_elem->count *
 457                                            cbss->beacon_interval));
 458         }
 459 }
 460
 461 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 462                                         u16 capab_info, u8 *pwr_constr_elem,
 463                                         u8 pwr_constr_elem_len)
 464 {
 465         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 466
 467         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 468                 return;
 469
 470         /* Power constraint IE length should be 1 octet */
 471         if (pwr_constr_elem_len != 1)
 472                 return;
 473
 474         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 475             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 476                 sdata->local->power_constr_level = *pwr_constr_elem;
 477                 ieee80211_hw_config(sdata->local, 0);
 478         }
 479 }
 480
 481 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 482 {
 483         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 484         struct ieee80211_local *local = sdata->local;
 485         struct ieee80211_conf *conf = &local->hw.conf;
 486
 487         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 488                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 489                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 490
 491         local->disable_dynamic_ps = false;
 492         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 493 }
 494 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 495
 496 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 497 {
 498         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 499         struct ieee80211_local *local = sdata->local;
 500         struct ieee80211_conf *conf = &local->hw.conf;
 501
 502         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 503                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 504                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 505
 506         local->disable_dynamic_ps = true;
 507         conf->dynamic_ps_timeout = 0;
 508         del_timer_sync(&local->dynamic_ps_timer);
 509         ieee80211_queue_work(&local->hw,
 510                              &local->dynamic_ps_enable_work);
 511 }
 512 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 513
 514 /* powersave */
 515 static void ieee80211_enable_ps(struct ieee80211_local *local,
 516                                 struct ieee80211_sub_if_data *sdata)
 517 {
 518         struct ieee80211_conf *conf = &local->hw.conf;
 519
 520         /*
 521          * If we are scanning right now then the parameters will
 522          * take effect when scan finishes.
 523          */
 524         if (local->scanning)
 525                 return;
 526
 527         if (conf->dynamic_ps_timeout > 0 &&
 528             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 529                 mod_timer(&local->dynamic_ps_timer, jiffies +
 530                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 531         } else {
 532                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 533                         ieee80211_send_nullfunc(local, sdata, 1);
 534
 535                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 536                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 537                         return;
 538
 539                 conf->flags |= IEEE80211_CONF_PS;
 540                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 541         }
 542 }
 543
 544 static void ieee80211_change_ps(struct ieee80211_local *local)
 545 {
 546         struct ieee80211_conf *conf = &local->hw.conf;
 547
 548         if (local->ps_sdata) {
 549                 ieee80211_enable_ps(local, local->ps_sdata);
 550         } else if (conf->flags & IEEE80211_CONF_PS) {
 551                 conf->flags &= ~IEEE80211_CONF_PS;
 552                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 553                 del_timer_sync(&local->dynamic_ps_timer);
 554                 cancel_work_sync(&local->dynamic_ps_enable_work);
 555         }
 556 }
 557
 558 /* need to hold RTNL or interface lock */
 559 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 560 {
 561         struct ieee80211_sub_if_data *sdata, *found = NULL;
 562         int count = 0;
 563         int timeout;
 564
 565         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 566                 local->ps_sdata = NULL;
 567                 return;
 568         }
 569
 570         if (!list_empty(&local->work_list)) {
 571                 local->ps_sdata = NULL;
 572                 goto change;
 573         }
 574
 575         list_for_each_entry(sdata, &local->interfaces, list) {
 576                 if (!ieee80211_sdata_running(sdata))
 577                         continue;
 578                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 579                         continue;
 580                 found = sdata;
 581                 count++;
 582         }
 583
 584         if (count == 1 && found->u.mgd.powersave &&
 585             found->u.mgd.associated &&
 586             found->u.mgd.associated->beacon_ies &&
 587             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 588                                     IEEE80211_STA_CONNECTION_POLL))) {
 589                 struct ieee80211_conf *conf = &local->hw.conf;
 590                 s32 beaconint_us;
 591
 592                 if (latency < 0)
 593                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 594
 595                 beaconint_us = ieee80211_tu_to_usec(
 596                                         found->vif.bss_conf.beacon_int);
 597
 598                 timeout = local->dynamic_ps_forced_timeout;
 599                 if (timeout < 0) {
 600                         /*
 601                          * Go to full PSM if the user configures a very low
 602                          * latency requirement.
 603                          * The 2 second value is there for compatibility until
 604                          * the PM_QOS_NETWORK_LATENCY is configured with real
 605                          * values.
 606                          */
 607                         if (latency > 1900000000 && latency != 2000000000)
 608                                 timeout = 0;
 609                         else
 610                                 timeout = 100;
 611                 }
 612                 local->dynamic_ps_user_timeout = timeout;
 613                 if (!local->disable_dynamic_ps)
 614                         conf->dynamic_ps_timeout =
 615                                 local->dynamic_ps_user_timeout;
 616
 617                 if (beaconint_us > latency) {
 618                         local->ps_sdata = NULL;
 619                 } else {
 620                         struct ieee80211_bss *bss;
 621                         int maxslp = 1;
 622                         u8 dtimper;
 623
 624                         bss = (void *)found->u.mgd.associated->priv;
 625                         dtimper = bss->dtim_period;
 626
 627                         /* If the TIM IE is invalid, pretend the value is 1 */
 628                         if (!dtimper)
 629                                 dtimper = 1;
 630                         else if (dtimper > 1)
 631                                 maxslp = min_t(int, dtimper,
 632                                                     latency / beaconint_us);
 633
 634                         local->hw.conf.max_sleep_period = maxslp;
 635                         local->hw.conf.ps_dtim_period = dtimper;
 636                         local->ps_sdata = found;
 637                 }
 638         } else {
 639                 local->ps_sdata = NULL;
 640         }
 641
 642  change:
 643         ieee80211_change_ps(local);
 644 }
 645
 646 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 647 {
 648         struct ieee80211_local *local =
 649                 container_of(work, struct ieee80211_local,
 650                              dynamic_ps_disable_work);
 651
 652         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 653                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 654                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 655         }
 656
 657         ieee80211_wake_queues_by_reason(&local->hw,
 658                                         IEEE80211_QUEUE_STOP_REASON_PS);
 659 }
 660
 661 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 662 {
 663         struct ieee80211_local *local =
 664                 container_of(work, struct ieee80211_local,
 665                              dynamic_ps_enable_work);
 666         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 667         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 668
 669         /* can only happen when PS was just disabled anyway */
 670         if (!sdata)
 671                 return;
 672
 673         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 674                 return;
 675
 676         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 677             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 678                 ieee80211_send_nullfunc(local, sdata, 1);
 679
 680         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 681               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 682             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 683                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 684                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 685                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 686         }
 687 }
 688
 689 void ieee80211_dynamic_ps_timer(unsigned long data)
 690 {
 691         struct ieee80211_local *local = (void *) data;
 692
 693         if (local->quiescing || local->suspended)
 694                 return;
 695
 696         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 697 }
 698
 699 /* MLME */
 700 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 701                                      struct ieee80211_sub_if_data *sdata,
 702                                      u8 *wmm_param, size_t wmm_param_len)
 703 {
 704         struct ieee80211_tx_queue_params params;
 705         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 706         size_t left;
 707         int count;
 708         u8 *pos, uapsd_queues = 0;
 709
 710         if (!local->ops->conf_tx)
 711                 return;
 712
 713         if (local->hw.queues < 4)
 714                 return;
 715
 716         if (!wmm_param)
 717                 return;
 718
 719         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 720                 return;
 721
 722         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 723                 uapsd_queues = local->uapsd_queues;
 724
 725         count = wmm_param[6] & 0x0f;
 726         if (count == ifmgd->wmm_last_param_set)
 727                 return;
 728         ifmgd->wmm_last_param_set = count;
 729
 730         pos = wmm_param + 8;
 731         left = wmm_param_len - 8;
 732
 733         memset(&params, 0, sizeof(params));
 734
 735         local->wmm_acm = 0;
 736         for (; left >= 4; left -= 4, pos += 4) {
 737                 int aci = (pos[0] >> 5) & 0x03;
 738                 int acm = (pos[0] >> 4) & 0x01;
 739                 bool uapsd = false;
 740                 int queue;
 741
 742                 switch (aci) {
 743                 case 1: /* AC_BK */
 744                         queue = 3;
 745                         if (acm)
 746                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 747                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 748                                 uapsd = true;
 749                         break;
 750                 case 2: /* AC_VI */
 751                         queue = 1;
 752                         if (acm)
 753                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 754                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 755                                 uapsd = true;
 756                         break;
 757                 case 3: /* AC_VO */
 758                         queue = 0;
 759                         if (acm)
 760                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 761                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 762                                 uapsd = true;
 763                         break;
 764                 case 0: /* AC_BE */
 765                 default:
 766                         queue = 2;
 767                         if (acm)
 768                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 769                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 770                                 uapsd = true;
 771                         break;
 772                 }
 773
 774                 params.aifs = pos[0] & 0x0f;
 775                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 776                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 777                 params.txop = get_unaligned_le16(pos + 2);
 778                 params.uapsd = uapsd;
 779
 780 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 781                 wiphy_debug(local->hw.wiphy,
 782                             "WMM queue=%d aci=%d acm=%d aifs=%d "
 783                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 784                             queue, aci, acm,
 785                             params.aifs, params.cw_min, params.cw_max,
 786                             params.txop, params.uapsd);
 787 #endif
 788                 if (drv_conf_tx(local, queue, &params))
 789                         wiphy_debug(local->hw.wiphy,
 790                                     "failed to set TX queue parameters for queue %d\n",
 791                                     queue);
 792         }
 793
 794         /* enable WMM or activate new settings */
 795         sdata->vif.bss_conf.qos = true;
 796         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 797 }
 798
 799 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 800                                            u16 capab, bool erp_valid, u8 erp)
 801 {
 802         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 803         u32 changed = 0;
 804         bool use_protection;
 805         bool use_short_preamble;
 806         bool use_short_slot;
 807
 808         if (erp_valid) {
 809                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 810                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 811         } else {
 812                 use_protection = false;
 813                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 814         }
 815
 816         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 817         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 818                 use_short_slot = true;
 819
 820         if (use_protection != bss_conf->use_cts_prot) {
 821                 bss_conf->use_cts_prot = use_protection;
 822                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 823         }
 824
 825         if (use_short_preamble != bss_conf->use_short_preamble) {
 826                 bss_conf->use_short_preamble = use_short_preamble;
 827                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 828         }
 829
 830         if (use_short_slot != bss_conf->use_short_slot) {
 831                 bss_conf->use_short_slot = use_short_slot;
 832                 changed |= BSS_CHANGED_ERP_SLOT;
 833         }
 834
 835         return changed;
 836 }
 837
 838 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 839                                      struct cfg80211_bss *cbss,
 840                                      u32 bss_info_changed)
 841 {
 842         struct ieee80211_bss *bss = (void *)cbss->priv;
 843         struct ieee80211_local *local = sdata->local;
 844         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 845
 846         bss_info_changed |= BSS_CHANGED_ASSOC;
 847         /* set timing information */
 848         bss_conf->beacon_int = cbss->beacon_interval;
 849         bss_conf->timestamp = cbss->tsf;
 850
 851         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 852         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 853                 cbss->capability, bss->has_erp_value, bss->erp_value);
 854
 855         sdata->u.mgd.associated = cbss;
 856         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 857
 858         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 859
 860         /* just to be sure */
 861         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 862                                 IEEE80211_STA_BEACON_POLL);
 863
 864         /*
 865          * Always handle WMM once after association regardless
 866          * of the first value the AP uses. Setting -1 here has
 867          * that effect because the AP values is an unsigned
 868          * 4-bit value.
 869          */
 870         sdata->u.mgd.wmm_last_param_set = -1;
 871
 872         ieee80211_led_assoc(local, 1);
 873
 874         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
 875                 bss_conf->dtim_period = bss->dtim_period;
 876         else
 877                 bss_conf->dtim_period = 0;
 878
 879         bss_conf->assoc = 1;
 880         /*
 881          * For now just always ask the driver to update the basic rateset
 882          * when we have associated, we aren't checking whether it actually
 883          * changed or not.
 884          */
 885         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 886
 887         /* And the BSSID changed - we're associated now */
 888         bss_info_changed |= BSS_CHANGED_BSSID;
 889
 890         /* Tell the driver to monitor connection quality (if supported) */
 891         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 892             bss_conf->cqm_rssi_thold)
 893                 bss_info_changed |= BSS_CHANGED_CQM;
 894
 895         /* Enable ARP filtering */
 896         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
 897                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 898                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
 899         }
 900
 901         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 902
 903         mutex_lock(&local->iflist_mtx);
 904         ieee80211_recalc_ps(local, -1);
 905         ieee80211_recalc_smps(local, sdata);
 906         mutex_unlock(&local->iflist_mtx);
 907
 908         netif_tx_start_all_queues(sdata->dev);
 909         netif_carrier_on(sdata->dev);
 910 }
 911
 912 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 913                                    bool remove_sta)
 914 {
 915         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 916         struct ieee80211_local *local = sdata->local;
 917         struct sta_info *sta;
 918         u32 changed = 0, config_changed = 0;
 919         u8 bssid[ETH_ALEN];
 920
 921         ASSERT_MGD_MTX(ifmgd);
 922
 923         if (WARN_ON(!ifmgd->associated))
 924                 return;
 925
 926         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 927
 928         ifmgd->associated = NULL;
 929         memset(ifmgd->bssid, 0, ETH_ALEN);
 930
 931         /*
 932          * we need to commit the associated = NULL change because the
 933          * scan code uses that to determine whether this iface should
 934          * go to/wake up from powersave or not -- and could otherwise
 935          * wake the queues erroneously.
 936          */
 937         smp_mb();
 938
 939         /*
 940          * Thus, we can only afterwards stop the queues -- to account
 941          * for the case where another CPU is finishing a scan at this
 942          * time -- we don't want the scan code to enable queues.
 943          */
 944
 945         netif_tx_stop_all_queues(sdata->dev);
 946         netif_carrier_off(sdata->dev);
 947
 948         mutex_lock(&local->sta_mtx);
 949         sta = sta_info_get(sdata, bssid);
 950         if (sta) {
 951                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
 952                 ieee80211_sta_tear_down_BA_sessions(sta);
 953         }
 954         mutex_unlock(&local->sta_mtx);
 955
 956         changed |= ieee80211_reset_erp_info(sdata);
 957
 958         ieee80211_led_assoc(local, 0);
 959         changed |= BSS_CHANGED_ASSOC;
 960         sdata->vif.bss_conf.assoc = false;
 961
 962         ieee80211_set_wmm_default(sdata);
 963
 964         /* channel(_type) changes are handled by ieee80211_hw_config */
 965         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
 966
 967         /* on the next assoc, re-program HT parameters */
 968         sdata->ht_opmode_valid = false;
 969
 970         local->power_constr_level = 0;
 971
 972         del_timer_sync(&local->dynamic_ps_timer);
 973         cancel_work_sync(&local->dynamic_ps_enable_work);
 974
 975         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 976                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 977                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 978         }
 979
 980         ieee80211_hw_config(local, config_changed);
 981
 982         /* Disable ARP filtering */
 983         if (sdata->vif.bss_conf.arp_filter_enabled) {
 984                 sdata->vif.bss_conf.arp_filter_enabled = false;
 985                 changed |= BSS_CHANGED_ARP_FILTER;
 986         }
 987
 988         /* The BSSID (not really interesting) and HT changed */
 989         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
 990         ieee80211_bss_info_change_notify(sdata, changed);
 991
 992         if (remove_sta)
 993                 sta_info_destroy_addr(sdata, bssid);
 994
 995         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
 996         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
 997         del_timer_sync(&sdata->u.mgd.timer);
 998         del_timer_sync(&sdata->u.mgd.chswitch_timer);
 999 }
1000
1001 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1002                              struct ieee80211_hdr *hdr)
1003 {
1004         /*
1005          * We can postpone the mgd.timer whenever receiving unicast frames
1006          * from AP because we know that the connection is working both ways
1007          * at that time. But multicast frames (and hence also beacons) must
1008          * be ignored here, because we need to trigger the timer during
1009          * data idle periods for sending the periodic probe request to the
1010          * AP we're connected to.
1011          */
1012         if (is_multicast_ether_addr(hdr->addr1))
1013                 return;
1014
1015         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1016                 return;
1017
1018         mod_timer(&sdata->u.mgd.conn_mon_timer,
1019                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1020 }
1021
1022 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1023 {
1024         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1025         const u8 *ssid;
1026
1027         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1028         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
1029                                  ssid + 2, ssid[1], NULL, 0);
1030
1031         ifmgd->probe_send_count++;
1032         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1033         run_again(ifmgd, ifmgd->probe_timeout);
1034 }
1035
1036 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1037                                    bool beacon)
1038 {
1039         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1040         bool already = false;
1041
1042         if (!ieee80211_sdata_running(sdata))
1043                 return;
1044
1045         if (sdata->local->scanning)
1046                 return;
1047
1048         if (sdata->local->tmp_channel)
1049                 return;
1050
1051         mutex_lock(&ifmgd->mtx);
1052
1053         if (!ifmgd->associated)
1054                 goto out;
1055
1056 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1057         if (beacon && net_ratelimit())
1058                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1059                        "- sending probe request\n", sdata->name);
1060 #endif
1061
1062         /*
1063          * The driver/our work has already reported this event or the
1064          * connection monitoring has kicked in and we have already sent
1065          * a probe request. Or maybe the AP died and the driver keeps
1066          * reporting until we disassociate...
1067          *
1068          * In either case we have to ignore the current call to this
1069          * function (except for setting the correct probe reason bit)
1070          * because otherwise we would reset the timer every time and
1071          * never check whether we received a probe response!
1072          */
1073         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1074                             IEEE80211_STA_CONNECTION_POLL))
1075                 already = true;
1076
1077         if (beacon)
1078                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1079         else
1080                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1081
1082         if (already)
1083                 goto out;
1084
1085         mutex_lock(&sdata->local->iflist_mtx);
1086         ieee80211_recalc_ps(sdata->local, -1);
1087         mutex_unlock(&sdata->local->iflist_mtx);
1088
1089         ifmgd->probe_send_count = 0;
1090         ieee80211_mgd_probe_ap_send(sdata);
1091  out:
1092         mutex_unlock(&ifmgd->mtx);
1093 }
1094
1095 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1096 {
1097         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1098         struct ieee80211_local *local = sdata->local;
1099         u8 bssid[ETH_ALEN];
1100
1101         mutex_lock(&ifmgd->mtx);
1102         if (!ifmgd->associated) {
1103                 mutex_unlock(&ifmgd->mtx);
1104                 return;
1105         }
1106
1107         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1108
1109         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1110
1111         ieee80211_set_disassoc(sdata, true);
1112         mutex_unlock(&ifmgd->mtx);
1113
1114         mutex_lock(&local->mtx);
1115         ieee80211_recalc_idle(local);
1116         mutex_unlock(&local->mtx);
1117         /*
1118          * must be outside lock due to cfg80211,
1119          * but that's not a problem.
1120          */
1121         ieee80211_send_deauth_disassoc(sdata, bssid,
1122                                        IEEE80211_STYPE_DEAUTH,
1123                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1124                                        NULL, true);
1125 }
1126
1127 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1128 {
1129         struct ieee80211_sub_if_data *sdata =
1130                 container_of(work, struct ieee80211_sub_if_data,
1131                              u.mgd.beacon_connection_loss_work);
1132
1133         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1134                 __ieee80211_connection_loss(sdata);
1135         else
1136                 ieee80211_mgd_probe_ap(sdata, true);
1137 }
1138
1139 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1140 {
1141         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1142         struct ieee80211_hw *hw = &sdata->local->hw;
1143
1144         trace_api_beacon_loss(sdata);
1145
1146         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1147         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1148 }
1149 EXPORT_SYMBOL(ieee80211_beacon_loss);
1150
1151 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1152 {
1153         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1154         struct ieee80211_hw *hw = &sdata->local->hw;
1155
1156         trace_api_connection_loss(sdata);
1157
1158         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1159         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1160 }
1161 EXPORT_SYMBOL(ieee80211_connection_loss);
1162
1163
1164 static enum rx_mgmt_action __must_check
1165 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1166                          struct ieee80211_mgmt *mgmt, size_t len)
1167 {
1168         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1169         const u8 *bssid = NULL;
1170         u16 reason_code;
1171
1172         if (len < 24 + 2)
1173                 return RX_MGMT_NONE;
1174
1175         ASSERT_MGD_MTX(ifmgd);
1176
1177         bssid = ifmgd->associated->bssid;
1178
1179         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1180
1181         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1182                         sdata->name, bssid, reason_code);
1183
1184         ieee80211_set_disassoc(sdata, true);
1185         mutex_lock(&sdata->local->mtx);
1186         ieee80211_recalc_idle(sdata->local);
1187         mutex_unlock(&sdata->local->mtx);
1188
1189         return RX_MGMT_CFG80211_DEAUTH;
1190 }
1191
1192
1193 static enum rx_mgmt_action __must_check
1194 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1195                            struct ieee80211_mgmt *mgmt, size_t len)
1196 {
1197         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1198         u16 reason_code;
1199
1200         if (len < 24 + 2)
1201                 return RX_MGMT_NONE;
1202
1203         ASSERT_MGD_MTX(ifmgd);
1204
1205         if (WARN_ON(!ifmgd->associated))
1206                 return RX_MGMT_NONE;
1207
1208         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1209                 return RX_MGMT_NONE;
1210
1211         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1212
1213         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1214                         sdata->name, mgmt->sa, reason_code);
1215
1216         ieee80211_set_disassoc(sdata, true);
1217         mutex_lock(&sdata->local->mtx);
1218         ieee80211_recalc_idle(sdata->local);
1219         mutex_unlock(&sdata->local->mtx);
1220         return RX_MGMT_CFG80211_DISASSOC;
1221 }
1222
1223
1224 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1225                                     struct ieee80211_mgmt *mgmt, size_t len)
1226 {
1227         struct ieee80211_sub_if_data *sdata = wk->sdata;
1228         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1229         struct ieee80211_local *local = sdata->local;
1230         struct ieee80211_supported_band *sband;
1231         struct sta_info *sta;
1232         struct cfg80211_bss *cbss = wk->assoc.bss;
1233         u8 *pos;
1234         u32 rates, basic_rates;
1235         u16 capab_info, aid;
1236         struct ieee802_11_elems elems;
1237         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1238         u32 changed = 0;
1239         int i, j, err;
1240         bool have_higher_than_11mbit = false;
1241         u16 ap_ht_cap_flags;
1242
1243         /* AssocResp and ReassocResp have identical structure */
1244
1245         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1246         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1247
1248         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1249                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1250                        "set\n", sdata->name, aid);
1251         aid &= ~(BIT(15) | BIT(14));
1252
1253         pos = mgmt->u.assoc_resp.variable;
1254         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1255
1256         if (!elems.supp_rates) {
1257                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1258                        sdata->name);
1259                 return false;
1260         }
1261
1262         ifmgd->aid = aid;
1263
1264         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1265         if (!sta) {
1266                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1267                        " the AP\n", sdata->name);
1268                 return false;
1269         }
1270
1271         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1272                            WLAN_STA_ASSOC_AP);
1273         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1274                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1275
1276         rates = 0;
1277         basic_rates = 0;
1278         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1279
1280         for (i = 0; i < elems.supp_rates_len; i++) {
1281                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1282                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1283
1284                 if (rate > 110)
1285                         have_higher_than_11mbit = true;
1286
1287                 for (j = 0; j < sband->n_bitrates; j++) {
1288                         if (sband->bitrates[j].bitrate == rate) {
1289                                 rates |= BIT(j);
1290                                 if (is_basic)
1291                                         basic_rates |= BIT(j);
1292                                 break;
1293                         }
1294                 }
1295         }
1296
1297         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1298                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1299                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1300
1301                 if (rate > 110)
1302                         have_higher_than_11mbit = true;
1303
1304                 for (j = 0; j < sband->n_bitrates; j++) {
1305                         if (sband->bitrates[j].bitrate == rate) {
1306                                 rates |= BIT(j);
1307                                 if (is_basic)
1308                                         basic_rates |= BIT(j);
1309                                 break;
1310                         }
1311                 }
1312         }
1313
1314         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1315         sdata->vif.bss_conf.basic_rates = basic_rates;
1316
1317         /* cf. IEEE 802.11 9.2.12 */
1318         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1319             have_higher_than_11mbit)
1320                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1321         else
1322                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1323
1324         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1325                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1326                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1327
1328         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1329
1330         rate_control_rate_init(sta);
1331
1332         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1333                 set_sta_flags(sta, WLAN_STA_MFP);
1334
1335         if (elems.wmm_param)
1336                 set_sta_flags(sta, WLAN_STA_WME);
1337
1338         err = sta_info_insert(sta);
1339         sta = NULL;
1340         if (err) {
1341                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1342                        " the AP (error %d)\n", sdata->name, err);
1343                 return false;
1344         }
1345
1346         if (elems.wmm_param)
1347                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1348                                          elems.wmm_param_len);
1349         else
1350                 ieee80211_set_wmm_default(sdata);
1351
1352         local->oper_channel = wk->chan;
1353
1354         if (elems.ht_info_elem && elems.wmm_param &&
1355             (sdata->local->hw.queues >= 4) &&
1356             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1357                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1358                                                cbss->bssid, ap_ht_cap_flags);
1359
1360         /* set AID and assoc capability,
1361          * ieee80211_set_associated() will tell the driver */
1362         bss_conf->aid = aid;
1363         bss_conf->assoc_capability = capab_info;
1364         ieee80211_set_associated(sdata, cbss, changed);
1365
1366         /*
1367          * If we're using 4-addr mode, let the AP know that we're
1368          * doing so, so that it can create the STA VLAN on its side
1369          */
1370         if (ifmgd->use_4addr)
1371                 ieee80211_send_4addr_nullfunc(local, sdata);
1372
1373         /*
1374          * Start timer to probe the connection to the AP now.
1375          * Also start the timer that will detect beacon loss.
1376          */
1377         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1378         mod_beacon_timer(sdata);
1379
1380         return true;
1381 }
1382
1383
1384 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1385                                   struct ieee80211_mgmt *mgmt,
1386                                   size_t len,
1387                                   struct ieee80211_rx_status *rx_status,
1388                                   struct ieee802_11_elems *elems,
1389                                   bool beacon)
1390 {
1391         struct ieee80211_local *local = sdata->local;
1392         int freq;
1393         struct ieee80211_bss *bss;
1394         struct ieee80211_channel *channel;
1395         bool need_ps = false;
1396
1397         if (sdata->u.mgd.associated) {
1398                 bss = (void *)sdata->u.mgd.associated->priv;
1399                 /* not previously set so we may need to recalc */
1400                 need_ps = !bss->dtim_period;
1401         }
1402
1403         if (elems->ds_params && elems->ds_params_len == 1)
1404                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1405         else
1406                 freq = rx_status->freq;
1407
1408         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1409
1410         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1411                 return;
1412
1413         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1414                                         channel, beacon);
1415         if (bss)
1416                 ieee80211_rx_bss_put(local, bss);
1417
1418         if (!sdata->u.mgd.associated)
1419                 return;
1420
1421         if (need_ps) {
1422                 mutex_lock(&local->iflist_mtx);
1423                 ieee80211_recalc_ps(local, -1);
1424                 mutex_unlock(&local->iflist_mtx);
1425         }
1426
1427         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1428             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1429                                                         ETH_ALEN) == 0)) {
1430                 struct ieee80211_channel_sw_ie *sw_elem =
1431                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1432                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1433                                                  bss, rx_status->mactime);
1434         }
1435 }
1436
1437
1438 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1439                                          struct sk_buff *skb)
1440 {
1441         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1442         struct ieee80211_if_managed *ifmgd;
1443         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1444         size_t baselen, len = skb->len;
1445         struct ieee802_11_elems elems;
1446
1447         ifmgd = &sdata->u.mgd;
1448
1449         ASSERT_MGD_MTX(ifmgd);
1450
1451         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1452                 return; /* ignore ProbeResp to foreign address */
1453
1454         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1455         if (baselen > len)
1456                 return;
1457
1458         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1459                                 &elems);
1460
1461         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1462
1463         if (ifmgd->associated &&
1464             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1465             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1466                             IEEE80211_STA_CONNECTION_POLL)) {
1467                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1468                                   IEEE80211_STA_BEACON_POLL);
1469                 mutex_lock(&sdata->local->iflist_mtx);
1470                 ieee80211_recalc_ps(sdata->local, -1);
1471                 mutex_unlock(&sdata->local->iflist_mtx);
1472
1473                 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1474                         return;
1475
1476                 /*
1477                  * We've received a probe response, but are not sure whether
1478                  * we have or will be receiving any beacons or data, so let's
1479                  * schedule the timers again, just in case.
1480                  */
1481                 mod_beacon_timer(sdata);
1482
1483                 mod_timer(&ifmgd->conn_mon_timer,
1484                           round_jiffies_up(jiffies +
1485                                            IEEE80211_CONNECTION_IDLE_TIME));
1486         }
1487 }
1488
1489 /*
1490  * This is the canonical list of information elements we care about,
1491  * the filter code also gives us all changes to the Microsoft OUI
1492  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1493  *
1494  * We implement beacon filtering in software since that means we can
1495  * avoid processing the frame here and in cfg80211, and userspace
1496  * will not be able to tell whether the hardware supports it or not.
1497  *
1498  * XXX: This list needs to be dynamic -- userspace needs to be able to
1499  *      add items it requires. It also needs to be able to tell us to
1500  *      look out for other vendor IEs.
1501  */
1502 static const u64 care_about_ies =
1503         (1ULL << WLAN_EID_COUNTRY) |
1504         (1ULL << WLAN_EID_ERP_INFO) |
1505         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1506         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1507         (1ULL << WLAN_EID_HT_CAPABILITY) |
1508         (1ULL << WLAN_EID_HT_INFORMATION);
1509
1510 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1511                                      struct ieee80211_mgmt *mgmt,
1512                                      size_t len,
1513                                      struct ieee80211_rx_status *rx_status)
1514 {
1515         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1516         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1517         size_t baselen;
1518         struct ieee802_11_elems elems;
1519         struct ieee80211_local *local = sdata->local;
1520         u32 changed = 0;
1521         bool erp_valid, directed_tim = false;
1522         u8 erp_value = 0;
1523         u32 ncrc;
1524         u8 *bssid;
1525
1526         ASSERT_MGD_MTX(ifmgd);
1527
1528         /* Process beacon from the current BSS */
1529         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1530         if (baselen > len)
1531                 return;
1532
1533         if (rx_status->freq != local->hw.conf.channel->center_freq)
1534                 return;
1535
1536         /*
1537          * We might have received a number of frames, among them a
1538          * disassoc frame and a beacon...
1539          */
1540         if (!ifmgd->associated)
1541                 return;
1542
1543         bssid = ifmgd->associated->bssid;
1544
1545         /*
1546          * And in theory even frames from a different AP we were just
1547          * associated to a split-second ago!
1548          */
1549         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1550                 return;
1551
1552         /* Track average RSSI from the Beacon frames of the current AP */
1553         ifmgd->last_beacon_signal = rx_status->signal;
1554         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1555                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1556                 ifmgd->ave_beacon_signal = rx_status->signal;
1557                 ifmgd->last_cqm_event_signal = 0;
1558         } else {
1559                 ifmgd->ave_beacon_signal =
1560                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1561                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1562                          ifmgd->ave_beacon_signal) / 16;
1563         }
1564         if (bss_conf->cqm_rssi_thold &&
1565             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1566                 int sig = ifmgd->ave_beacon_signal / 16;
1567                 int last_event = ifmgd->last_cqm_event_signal;
1568                 int thold = bss_conf->cqm_rssi_thold;
1569                 int hyst = bss_conf->cqm_rssi_hyst;
1570                 if (sig < thold &&
1571                     (last_event == 0 || sig < last_event - hyst)) {
1572                         ifmgd->last_cqm_event_signal = sig;
1573                         ieee80211_cqm_rssi_notify(
1574                                 &sdata->vif,
1575                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1576                                 GFP_KERNEL);
1577                 } else if (sig > thold &&
1578                            (last_event == 0 || sig > last_event + hyst)) {
1579                         ifmgd->last_cqm_event_signal = sig;
1580                         ieee80211_cqm_rssi_notify(
1581                                 &sdata->vif,
1582                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1583                                 GFP_KERNEL);
1584                 }
1585         }
1586
1587         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1588 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1589                 if (net_ratelimit()) {
1590                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1591                                "to a received beacon\n", sdata->name);
1592                 }
1593 #endif
1594                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1595                 mutex_lock(&local->iflist_mtx);
1596                 ieee80211_recalc_ps(local, -1);
1597                 mutex_unlock(&local->iflist_mtx);
1598         }
1599
1600         /*
1601          * Push the beacon loss detection into the future since
1602          * we are processing a beacon from the AP just now.
1603          */
1604         mod_beacon_timer(sdata);
1605
1606         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1607         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1608                                           len - baselen, &elems,
1609                                           care_about_ies, ncrc);
1610
1611         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1612                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1613                                                    ifmgd->aid);
1614
1615         if (ncrc != ifmgd->beacon_crc) {
1616                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1617                                       true);
1618
1619                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1620                                          elems.wmm_param_len);
1621         }
1622
1623         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1624                 if (directed_tim) {
1625                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1626                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1627                                 ieee80211_hw_config(local,
1628                                                     IEEE80211_CONF_CHANGE_PS);
1629                                 ieee80211_send_nullfunc(local, sdata, 0);
1630                         } else {
1631                                 local->pspolling = true;
1632
1633                                 /*
1634                                  * Here is assumed that the driver will be
1635                                  * able to send ps-poll frame and receive a
1636                                  * response even though power save mode is
1637                                  * enabled, but some drivers might require
1638                                  * to disable power save here. This needs
1639                                  * to be investigated.
1640                                  */
1641                                 ieee80211_send_pspoll(local, sdata);
1642                         }
1643                 }
1644         }
1645
1646         if (ncrc == ifmgd->beacon_crc)
1647                 return;
1648         ifmgd->beacon_crc = ncrc;
1649
1650         if (elems.erp_info && elems.erp_info_len >= 1) {
1651                 erp_valid = true;
1652                 erp_value = elems.erp_info[0];
1653         } else {
1654                 erp_valid = false;
1655         }
1656         changed |= ieee80211_handle_bss_capability(sdata,
1657                         le16_to_cpu(mgmt->u.beacon.capab_info),
1658                         erp_valid, erp_value);
1659
1660
1661         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1662             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1663                 struct sta_info *sta;
1664                 struct ieee80211_supported_band *sband;
1665                 u16 ap_ht_cap_flags;
1666
1667                 rcu_read_lock();
1668
1669                 sta = sta_info_get(sdata, bssid);
1670                 if (WARN_ON(!sta)) {
1671                         rcu_read_unlock();
1672                         return;
1673                 }
1674
1675                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1676
1677                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1678                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1679
1680                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1681
1682                 rcu_read_unlock();
1683
1684                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1685                                                bssid, ap_ht_cap_flags);
1686         }
1687
1688         /* Note: country IE parsing is done for us by cfg80211 */
1689         if (elems.country_elem) {
1690                 /* TODO: IBSS also needs this */
1691                 if (elems.pwr_constr_elem)
1692                         ieee80211_handle_pwr_constr(sdata,
1693                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1694                                 elems.pwr_constr_elem,
1695                                 elems.pwr_constr_elem_len);
1696         }
1697
1698         ieee80211_bss_info_change_notify(sdata, changed);
1699 }
1700
1701 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1702                                   struct sk_buff *skb)
1703 {
1704         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1705         struct ieee80211_rx_status *rx_status;
1706         struct ieee80211_mgmt *mgmt;
1707         enum rx_mgmt_action rma = RX_MGMT_NONE;
1708         u16 fc;
1709
1710         rx_status = (struct ieee80211_rx_status *) skb->cb;
1711         mgmt = (struct ieee80211_mgmt *) skb->data;
1712         fc = le16_to_cpu(mgmt->frame_control);
1713
1714         mutex_lock(&ifmgd->mtx);
1715
1716         if (ifmgd->associated &&
1717             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1718                 switch (fc & IEEE80211_FCTL_STYPE) {
1719                 case IEEE80211_STYPE_BEACON:
1720                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1721                                                  rx_status);
1722                         break;
1723                 case IEEE80211_STYPE_PROBE_RESP:
1724                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1725                         break;
1726                 case IEEE80211_STYPE_DEAUTH:
1727                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1728                         break;
1729                 case IEEE80211_STYPE_DISASSOC:
1730                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1731                         break;
1732                 case IEEE80211_STYPE_ACTION:
1733                         switch (mgmt->u.action.category) {
1734                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1735                                 ieee80211_sta_process_chanswitch(sdata,
1736                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1737                                                 (void *)ifmgd->associated->priv,
1738                                                 rx_status->mactime);
1739                                 break;
1740                         }
1741                 }
1742                 mutex_unlock(&ifmgd->mtx);
1743
1744                 switch (rma) {
1745                 case RX_MGMT_NONE:
1746                         /* no action */
1747                         break;
1748                 case RX_MGMT_CFG80211_DEAUTH:
1749                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1750                         break;
1751                 case RX_MGMT_CFG80211_DISASSOC:
1752                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1753                         break;
1754                 default:
1755                         WARN(1, "unexpected: %d", rma);
1756                 }
1757                 return;
1758         }
1759
1760         mutex_unlock(&ifmgd->mtx);
1761
1762         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1763             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1764                 struct ieee80211_local *local = sdata->local;
1765                 struct ieee80211_work *wk;
1766
1767                 mutex_lock(&local->mtx);
1768                 list_for_each_entry(wk, &local->work_list, list) {
1769                         if (wk->sdata != sdata)
1770                                 continue;
1771
1772                         if (wk->type != IEEE80211_WORK_ASSOC &&
1773                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1774                                 continue;
1775
1776                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1777                                 continue;
1778                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1779                                 continue;
1780
1781                         /*
1782                          * Printing the message only here means we can't
1783                          * spuriously print it, but it also means that it
1784                          * won't be printed when the frame comes in before
1785                          * we even tried to associate or in similar cases.
1786                          *
1787                          * Ultimately, I suspect cfg80211 should print the
1788                          * messages instead.
1789                          */
1790                         printk(KERN_DEBUG
1791                                "%s: deauthenticated from %pM (Reason: %u)\n",
1792                                sdata->name, mgmt->bssid,
1793                                le16_to_cpu(mgmt->u.deauth.reason_code));
1794
1795                         list_del_rcu(&wk->list);
1796                         free_work(wk);
1797                         break;
1798                 }
1799                 mutex_unlock(&local->mtx);
1800
1801                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1802         }
1803 }
1804
1805 static void ieee80211_sta_timer(unsigned long data)
1806 {
1807         struct ieee80211_sub_if_data *sdata =
1808                 (struct ieee80211_sub_if_data *) data;
1809         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1810         struct ieee80211_local *local = sdata->local;
1811
1812         if (local->quiescing) {
1813                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1814                 return;
1815         }
1816
1817         ieee80211_queue_work(&local->hw, &sdata->work);
1818 }
1819
1820 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
1821 {
1822         struct ieee80211_local *local = sdata->local;
1823         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1824
1825         /* then process the rest of the work */
1826         mutex_lock(&ifmgd->mtx);
1827
1828         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1829                             IEEE80211_STA_CONNECTION_POLL) &&
1830             ifmgd->associated) {
1831                 u8 bssid[ETH_ALEN];
1832
1833                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1834                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1835                         run_again(ifmgd, ifmgd->probe_timeout);
1836
1837                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1838 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1839                         printk(KERN_DEBUG "No probe response from AP %pM"
1840                                 " after %dms, try %d\n", bssid,
1841                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1842                                 ifmgd->probe_send_count);
1843 #endif
1844                         ieee80211_mgd_probe_ap_send(sdata);
1845                 } else {
1846                         /*
1847                          * We actually lost the connection ... or did we?
1848                          * Let's make sure!
1849                          */
1850                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1851                                           IEEE80211_STA_BEACON_POLL);
1852                         printk(KERN_DEBUG "No probe response from AP %pM"
1853                                 " after %dms, disconnecting.\n",
1854                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1855                         ieee80211_set_disassoc(sdata, true);
1856                         mutex_unlock(&ifmgd->mtx);
1857                         mutex_lock(&local->mtx);
1858                         ieee80211_recalc_idle(local);
1859                         mutex_unlock(&local->mtx);
1860                         /*
1861                          * must be outside lock due to cfg80211,
1862                          * but that's not a problem.
1863                          */
1864                         ieee80211_send_deauth_disassoc(sdata, bssid,
1865                                         IEEE80211_STYPE_DEAUTH,
1866                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1867                                         NULL, true);
1868                         mutex_lock(&ifmgd->mtx);
1869                 }
1870         }
1871
1872         mutex_unlock(&ifmgd->mtx);
1873 }
1874
1875 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1876 {
1877         struct ieee80211_sub_if_data *sdata =
1878                 (struct ieee80211_sub_if_data *) data;
1879         struct ieee80211_local *local = sdata->local;
1880
1881         if (local->quiescing)
1882                 return;
1883
1884         ieee80211_queue_work(&sdata->local->hw,
1885                              &sdata->u.mgd.beacon_connection_loss_work);
1886 }
1887
1888 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1889 {
1890         struct ieee80211_sub_if_data *sdata =
1891                 (struct ieee80211_sub_if_data *) data;
1892         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1893         struct ieee80211_local *local = sdata->local;
1894
1895         if (local->quiescing)
1896                 return;
1897
1898         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1899 }
1900
1901 static void ieee80211_sta_monitor_work(struct work_struct *work)
1902 {
1903         struct ieee80211_sub_if_data *sdata =
1904                 container_of(work, struct ieee80211_sub_if_data,
1905                              u.mgd.monitor_work);
1906
1907         ieee80211_mgd_probe_ap(sdata, false);
1908 }
1909
1910 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1911 {
1912         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1913                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1914                                         IEEE80211_STA_CONNECTION_POLL);
1915
1916                 /* let's probe the connection once */
1917                 ieee80211_queue_work(&sdata->local->hw,
1918                            &sdata->u.mgd.monitor_work);
1919                 /* and do all the other regular work too */
1920                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1921         }
1922 }
1923
1924 #ifdef CONFIG_PM
1925 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1926 {
1927         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1928
1929         /*
1930          * we need to use atomic bitops for the running bits
1931          * only because both timers might fire at the same
1932          * time -- the code here is properly synchronised.
1933          */
1934
1935         cancel_work_sync(&ifmgd->request_smps_work);
1936
1937         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1938         if (del_timer_sync(&ifmgd->timer))
1939                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1940
1941         cancel_work_sync(&ifmgd->chswitch_work);
1942         if (del_timer_sync(&ifmgd->chswitch_timer))
1943                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1944
1945         cancel_work_sync(&ifmgd->monitor_work);
1946         /* these will just be re-established on connection */
1947         del_timer_sync(&ifmgd->conn_mon_timer);
1948         del_timer_sync(&ifmgd->bcn_mon_timer);
1949 }
1950
1951 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1952 {
1953         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1954
1955         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1956                 add_timer(&ifmgd->timer);
1957         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1958                 add_timer(&ifmgd->chswitch_timer);
1959 }
1960 #endif
1961
1962 /* interface setup */
1963 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1964 {
1965         struct ieee80211_if_managed *ifmgd;
1966
1967         ifmgd = &sdata->u.mgd;
1968         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1969         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1970         INIT_WORK(&ifmgd->beacon_connection_loss_work,
1971                   ieee80211_beacon_connection_loss_work);
1972         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
1973         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1974                     (unsigned long) sdata);
1975         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1976                     (unsigned long) sdata);
1977         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1978                     (unsigned long) sdata);
1979         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1980                     (unsigned long) sdata);
1981
1982         ifmgd->flags = 0;
1983
1984         mutex_init(&ifmgd->mtx);
1985
1986         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1987                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1988         else
1989                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1990 }
1991
1992 /* scan finished notification */
1993 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1994 {
1995         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1996
1997         /* Restart STA timers */
1998         rcu_read_lock();
1999         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2000                 ieee80211_restart_sta_timer(sdata);
2001         rcu_read_unlock();
2002 }
2003
2004 int ieee80211_max_network_latency(struct notifier_block *nb,
2005                                   unsigned long data, void *dummy)
2006 {
2007         s32 latency_usec = (s32) data;
2008         struct ieee80211_local *local =
2009                 container_of(nb, struct ieee80211_local,
2010                              network_latency_notifier);
2011
2012         mutex_lock(&local->iflist_mtx);
2013         ieee80211_recalc_ps(local, latency_usec);
2014         mutex_unlock(&local->iflist_mtx);
2015
2016         return 0;
2017 }
2018
2019 /* config hooks */
2020 static enum work_done_result
2021 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2022                           struct sk_buff *skb)
2023 {
2024         if (!skb) {
2025                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2026                 return WORK_DONE_DESTROY;
2027         }
2028
2029         if (wk->type == IEEE80211_WORK_AUTH) {
2030                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2031                 return WORK_DONE_DESTROY;
2032         }
2033
2034         mutex_lock(&wk->sdata->u.mgd.mtx);
2035         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2036         mutex_unlock(&wk->sdata->u.mgd.mtx);
2037
2038         wk->type = IEEE80211_WORK_AUTH;
2039         wk->probe_auth.tries = 0;
2040         return WORK_DONE_REQUEUE;
2041 }
2042
2043 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2044                        struct cfg80211_auth_request *req)
2045 {
2046         const u8 *ssid;
2047         struct ieee80211_work *wk;
2048         u16 auth_alg;
2049
2050         if (req->local_state_change)
2051                 return 0; /* no need to update mac80211 state */
2052
2053         switch (req->auth_type) {
2054         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2055                 auth_alg = WLAN_AUTH_OPEN;
2056                 break;
2057         case NL80211_AUTHTYPE_SHARED_KEY:
2058                 if (IS_ERR(sdata->local->wep_tx_tfm))
2059                         return -EOPNOTSUPP;
2060                 auth_alg = WLAN_AUTH_SHARED_KEY;
2061                 break;
2062         case NL80211_AUTHTYPE_FT:
2063                 auth_alg = WLAN_AUTH_FT;
2064                 break;
2065         case NL80211_AUTHTYPE_NETWORK_EAP:
2066                 auth_alg = WLAN_AUTH_LEAP;
2067                 break;
2068         default:
2069                 return -EOPNOTSUPP;
2070         }
2071
2072         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2073         if (!wk)
2074                 return -ENOMEM;
2075
2076         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2077
2078         if (req->ie && req->ie_len) {
2079                 memcpy(wk->ie, req->ie, req->ie_len);
2080                 wk->ie_len = req->ie_len;
2081         }
2082
2083         if (req->key && req->key_len) {
2084                 wk->probe_auth.key_len = req->key_len;
2085                 wk->probe_auth.key_idx = req->key_idx;
2086                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2087         }
2088
2089         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2090         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2091         wk->probe_auth.ssid_len = ssid[1];
2092
2093         wk->probe_auth.algorithm = auth_alg;
2094         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2095
2096         /* if we already have a probe, don't probe again */
2097         if (req->bss->proberesp_ies)
2098                 wk->type = IEEE80211_WORK_AUTH;
2099         else
2100                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2101         wk->chan = req->bss->channel;
2102         wk->sdata = sdata;
2103         wk->done = ieee80211_probe_auth_done;
2104
2105         ieee80211_add_work(wk);
2106         return 0;
2107 }
2108
2109 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2110                                                   struct sk_buff *skb)
2111 {
2112         struct ieee80211_mgmt *mgmt;
2113         struct ieee80211_rx_status *rx_status;
2114         struct ieee802_11_elems elems;
2115         u16 status;
2116
2117         if (!skb) {
2118                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2119                 return WORK_DONE_DESTROY;
2120         }
2121
2122         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2123                 mutex_lock(&wk->sdata->u.mgd.mtx);
2124                 rx_status = (void *) skb->cb;
2125                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2126                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2127                                       &elems, true);
2128                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2129
2130                 wk->type = IEEE80211_WORK_ASSOC;
2131                 /* not really done yet */
2132                 return WORK_DONE_REQUEUE;
2133         }
2134
2135         mgmt = (void *)skb->data;
2136         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2137
2138         if (status == WLAN_STATUS_SUCCESS) {
2139                 mutex_lock(&wk->sdata->u.mgd.mtx);
2140                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2141                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2142                         /* oops -- internal error -- send timeout for now */
2143                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2144                                                     wk->filter_ta);
2145                         return WORK_DONE_DESTROY;
2146                 }
2147
2148                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2149         }
2150
2151         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2152         return WORK_DONE_DESTROY;
2153 }
2154
2155 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2156                         struct cfg80211_assoc_request *req)
2157 {
2158         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2159         struct ieee80211_bss *bss = (void *)req->bss->priv;
2160         struct ieee80211_work *wk;
2161         const u8 *ssid;
2162         int i;
2163
2164         mutex_lock(&ifmgd->mtx);
2165         if (ifmgd->associated) {
2166                 if (!req->prev_bssid ||
2167                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2168                            ETH_ALEN)) {
2169                         /*
2170                          * We are already associated and the request was not a
2171                          * reassociation request from the current BSS, so
2172                          * reject it.
2173                          */
2174                         mutex_unlock(&ifmgd->mtx);
2175                         return -EALREADY;
2176                 }
2177
2178                 /* Trying to reassociate - clear previous association state */
2179                 ieee80211_set_disassoc(sdata, true);
2180         }
2181         mutex_unlock(&ifmgd->mtx);
2182
2183         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2184         if (!wk)
2185                 return -ENOMEM;
2186
2187         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2188         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2189
2190         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2191                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2192                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2193                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2194                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2195
2196
2197         if (req->ie && req->ie_len) {
2198                 memcpy(wk->ie, req->ie, req->ie_len);
2199                 wk->ie_len = req->ie_len;
2200         } else
2201                 wk->ie_len = 0;
2202
2203         wk->assoc.bss = req->bss;
2204
2205         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2206
2207         /* new association always uses requested smps mode */
2208         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2209                 if (ifmgd->powersave)
2210                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2211                 else
2212                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2213         } else
2214                 ifmgd->ap_smps = ifmgd->req_smps;
2215
2216         wk->assoc.smps = ifmgd->ap_smps;
2217         /*
2218          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2219          * We still associate in non-HT mode (11a/b/g) if any one of these
2220          * ciphers is configured as pairwise.
2221          * We can set this to true for non-11n hardware, that'll be checked
2222          * separately along with the peer capabilities.
2223          */
2224         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2225         wk->assoc.capability = req->bss->capability;
2226         wk->assoc.wmm_used = bss->wmm_used;
2227         wk->assoc.supp_rates = bss->supp_rates;
2228         wk->assoc.supp_rates_len = bss->supp_rates_len;
2229         wk->assoc.ht_information_ie =
2230                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2231
2232         if (bss->wmm_used && bss->uapsd_supported &&
2233             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2234                 wk->assoc.uapsd_used = true;
2235                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2236         } else {
2237                 wk->assoc.uapsd_used = false;
2238                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2239         }
2240
2241         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2242         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2243         wk->assoc.ssid_len = ssid[1];
2244
2245         if (req->prev_bssid)
2246                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2247
2248         wk->chan = req->bss->channel;
2249         wk->sdata = sdata;
2250         wk->done = ieee80211_assoc_done;
2251         if (!bss->dtim_period &&
2252             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2253                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2254         else
2255                 wk->type = IEEE80211_WORK_ASSOC;
2256
2257         if (req->use_mfp) {
2258                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2259                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2260         } else {
2261                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2262                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2263         }
2264
2265         if (req->crypto.control_port)
2266                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2267         else
2268                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2269
2270         sdata->control_port_protocol = req->crypto.control_port_ethertype;
2271         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2272
2273         ieee80211_add_work(wk);
2274         return 0;
2275 }
2276
2277 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2278                          struct cfg80211_deauth_request *req,
2279                          void *cookie)
2280 {
2281         struct ieee80211_local *local = sdata->local;
2282         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2283         struct ieee80211_work *wk;
2284         u8 bssid[ETH_ALEN];
2285         bool assoc_bss = false;
2286
2287         mutex_lock(&ifmgd->mtx);
2288
2289         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2290         if (ifmgd->associated == req->bss) {
2291                 ieee80211_set_disassoc(sdata, false);
2292                 mutex_unlock(&ifmgd->mtx);
2293                 assoc_bss = true;
2294         } else {
2295                 bool not_auth_yet = false;
2296
2297                 mutex_unlock(&ifmgd->mtx);
2298
2299                 mutex_lock(&local->mtx);
2300                 list_for_each_entry(wk, &local->work_list, list) {
2301                         if (wk->sdata != sdata)
2302                                 continue;
2303
2304                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2305                             wk->type != IEEE80211_WORK_AUTH &&
2306                             wk->type != IEEE80211_WORK_ASSOC &&
2307                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2308                                 continue;
2309
2310                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2311                                 continue;
2312
2313                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2314                         list_del_rcu(&wk->list);
2315                         free_work(wk);
2316                         break;
2317                 }
2318                 mutex_unlock(&local->mtx);
2319
2320                 /*
2321                  * If somebody requests authentication and we haven't
2322                  * sent out an auth frame yet there's no need to send
2323                  * out a deauth frame either. If the state was PROBE,
2324                  * then this is the case. If it's AUTH we have sent a
2325                  * frame, and if it's IDLE we have completed the auth
2326                  * process already.
2327                  */
2328                 if (not_auth_yet) {
2329                         __cfg80211_auth_canceled(sdata->dev, bssid);
2330                         return 0;
2331                 }
2332         }
2333
2334         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2335                sdata->name, bssid, req->reason_code);
2336
2337         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2338                                        req->reason_code, cookie,
2339                                        !req->local_state_change);
2340         if (assoc_bss)
2341                 sta_info_destroy_addr(sdata, bssid);
2342
2343         mutex_lock(&sdata->local->mtx);
2344         ieee80211_recalc_idle(sdata->local);
2345         mutex_unlock(&sdata->local->mtx);
2346
2347         return 0;
2348 }
2349
2350 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2351                            struct cfg80211_disassoc_request *req,
2352                            void *cookie)
2353 {
2354         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2355         u8 bssid[ETH_ALEN];
2356
2357         mutex_lock(&ifmgd->mtx);
2358
2359         /*
2360          * cfg80211 should catch this ... but it's racy since
2361          * we can receive a disassoc frame, process it, hand it
2362          * to cfg80211 while that's in a locked section already
2363          * trying to tell us that the user wants to disconnect.
2364          */
2365         if (ifmgd->associated != req->bss) {
2366                 mutex_unlock(&ifmgd->mtx);
2367                 return -ENOLINK;
2368         }
2369
2370         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2371                sdata->name, req->bss->bssid, req->reason_code);
2372
2373         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2374         ieee80211_set_disassoc(sdata, false);
2375
2376         mutex_unlock(&ifmgd->mtx);
2377
2378         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2379                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2380                         cookie, !req->local_state_change);
2381         sta_info_destroy_addr(sdata, bssid);
2382
2383         mutex_lock(&sdata->local->mtx);
2384         ieee80211_recalc_idle(sdata->local);
2385         mutex_unlock(&sdata->local->mtx);
2386
2387         return 0;
2388 }
2389
2390 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2391                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2392                                gfp_t gfp)
2393 {
2394         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2395
2396         trace_api_cqm_rssi_notify(sdata, rssi_event);
2397
2398         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2399 }
2400 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);