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 /*
  58  * How many Beacon frames need to have been used in average signal strength
  59  * before starting to indicate signal change events.
  60  */
  61 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  62
  63 #define TMR_RUNNING_TIMER       0
  64 #define TMR_RUNNING_CHANSW      1
  65
  66 /*
  67  * All cfg80211 functions have to be called outside a locked
  68  * section so that they can acquire a lock themselves... This
  69  * is much simpler than queuing up things in cfg80211, but we
  70  * do need some indirection for that here.
  71  */
  72 enum rx_mgmt_action {
  73         /* no action required */
  74         RX_MGMT_NONE,
  75
  76         /* caller must call cfg80211_send_rx_auth() */
  77         RX_MGMT_CFG80211_AUTH,
  78
  79         /* caller must call cfg80211_send_rx_assoc() */
  80         RX_MGMT_CFG80211_ASSOC,
  81
  82         /* caller must call cfg80211_send_deauth() */
  83         RX_MGMT_CFG80211_DEAUTH,
  84
  85         /* caller must call cfg80211_send_disassoc() */
  86         RX_MGMT_CFG80211_DISASSOC,
  87
  88         /* caller must tell cfg80211 about internal error */
  89         RX_MGMT_CFG80211_ASSOC_ERROR,
  90 };
  91
  92 /* utils */
  93 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  94 {
  95         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  96 }
  97
  98 /*
  99  * We can have multiple work items (and connection probing)
 100  * scheduling this timer, but we need to take care to only
 101  * reschedule it when it should fire _earlier_ than it was
 102  * asked for before, or if it's not pending right now. This
 103  * function ensures that. Note that it then is required to
 104  * run this function for all timeouts after the first one
 105  * has happened -- the work that runs from this timer will
 106  * do that.
 107  */
 108 static void run_again(struct ieee80211_if_managed *ifmgd,
 109                              unsigned long timeout)
 110 {
 111         ASSERT_MGD_MTX(ifmgd);
 112
 113         if (!timer_pending(&ifmgd->timer) ||
 114             time_before(timeout, ifmgd->timer.expires))
 115                 mod_timer(&ifmgd->timer, timeout);
 116 }
 117
 118 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 119 {
 120         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 121                 return;
 122
 123         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 124                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 125 }
 126
 127 static int ecw2cw(int ecw)
 128 {
 129         return (1 << ecw) - 1;
 130 }
 131
 132 /*
 133  * ieee80211_enable_ht should be called only after the operating band
 134  * has been determined as ht configuration depends on the hw's
 135  * HT abilities for a specific band.
 136  */
 137 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 138                                struct ieee80211_ht_info *hti,
 139                                const u8 *bssid, u16 ap_ht_cap_flags)
 140 {
 141         struct ieee80211_local *local = sdata->local;
 142         struct ieee80211_supported_band *sband;
 143         struct sta_info *sta;
 144         u32 changed = 0;
 145         u16 ht_opmode;
 146         bool enable_ht = true;
 147         enum nl80211_channel_type prev_chantype;
 148         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 149
 150         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 151
 152         prev_chantype = sdata->vif.bss_conf.channel_type;
 153
 154         /* HT is not supported */
 155         if (!sband->ht_cap.ht_supported)
 156                 enable_ht = false;
 157
 158         /* check that channel matches the right operating channel */
 159         if (local->hw.conf.channel->center_freq !=
 160             ieee80211_channel_to_frequency(hti->control_chan))
 161                 enable_ht = false;
 162
 163         if (enable_ht) {
 164                 channel_type = NL80211_CHAN_HT20;
 165
 166                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 167                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 168                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 169                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 170                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 171                                 if (!(local->hw.conf.channel->flags &
 172                                     IEEE80211_CHAN_NO_HT40PLUS))
 173                                         channel_type = NL80211_CHAN_HT40PLUS;
 174                                 break;
 175                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 176                                 if (!(local->hw.conf.channel->flags &
 177                                     IEEE80211_CHAN_NO_HT40MINUS))
 178                                         channel_type = NL80211_CHAN_HT40MINUS;
 179                                 break;
 180                         }
 181                 }
 182         }
 183
 184         if (local->tmp_channel)
 185                 local->tmp_channel_type = channel_type;
 186
 187         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 188                 /* can only fail due to HT40+/- mismatch */
 189                 channel_type = NL80211_CHAN_HT20;
 190                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 191         }
 192
 193         /* channel_type change automatically detected */
 194         ieee80211_hw_config(local, 0);
 195
 196         if (prev_chantype != channel_type) {
 197                 rcu_read_lock();
 198                 sta = sta_info_get(sdata, bssid);
 199                 if (sta)
 200                         rate_control_rate_update(local, sband, sta,
 201                                                  IEEE80211_RC_HT_CHANGED,
 202                                                  channel_type);
 203                 rcu_read_unlock();
 204         }
 205
 206         ht_opmode = le16_to_cpu(hti->operation_mode);
 207
 208         /* if bss configuration changed store the new one */
 209         if (sdata->ht_opmode_valid != enable_ht ||
 210             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 211             prev_chantype != channel_type) {
 212                 changed |= BSS_CHANGED_HT;
 213                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 214                 sdata->ht_opmode_valid = enable_ht;
 215         }
 216
 217         return changed;
 218 }
 219
 220 /* frame sending functions */
 221
 222 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 223                                            const u8 *bssid, u16 stype, u16 reason,
 224                                            void *cookie, bool send_frame)
 225 {
 226         struct ieee80211_local *local = sdata->local;
 227         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 228         struct sk_buff *skb;
 229         struct ieee80211_mgmt *mgmt;
 230
 231         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 232         if (!skb) {
 233                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 234                        "deauth/disassoc frame\n", sdata->name);
 235                 return;
 236         }
 237         skb_reserve(skb, local->hw.extra_tx_headroom);
 238
 239         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 240         memset(mgmt, 0, 24);
 241         memcpy(mgmt->da, bssid, ETH_ALEN);
 242         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 243         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 244         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 245         skb_put(skb, 2);
 246         /* u.deauth.reason_code == u.disassoc.reason_code */
 247         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 248
 249         if (stype == IEEE80211_STYPE_DEAUTH)
 250                 if (cookie)
 251                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 252                 else
 253                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 254         else
 255                 if (cookie)
 256                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 257                 else
 258                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 259         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 260                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 261
 262         if (send_frame)
 263                 ieee80211_tx_skb(sdata, skb);
 264         else
 265                 kfree_skb(skb);
 266 }
 267
 268 void ieee80211_send_pspoll(struct ieee80211_local *local,
 269                            struct ieee80211_sub_if_data *sdata)
 270 {
 271         struct ieee80211_pspoll *pspoll;
 272         struct sk_buff *skb;
 273
 274         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 275         if (!skb)
 276                 return;
 277
 278         pspoll = (struct ieee80211_pspoll *) skb->data;
 279         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 280
 281         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 282         ieee80211_tx_skb(sdata, skb);
 283 }
 284
 285 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 286                              struct ieee80211_sub_if_data *sdata,
 287                              int powersave)
 288 {
 289         struct sk_buff *skb;
 290         struct ieee80211_hdr_3addr *nullfunc;
 291
 292         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 293         if (!skb)
 294                 return;
 295
 296         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 297         if (powersave)
 298                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 299
 300         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 301         ieee80211_tx_skb(sdata, skb);
 302 }
 303
 304 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 305                                           struct ieee80211_sub_if_data *sdata)
 306 {
 307         struct sk_buff *skb;
 308         struct ieee80211_hdr *nullfunc;
 309         __le16 fc;
 310
 311         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 312                 return;
 313
 314         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 315         if (!skb) {
 316                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 317                        "nullfunc frame\n", sdata->name);
 318                 return;
 319         }
 320         skb_reserve(skb, local->hw.extra_tx_headroom);
 321
 322         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 323         memset(nullfunc, 0, 30);
 324         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 325                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 326         nullfunc->frame_control = fc;
 327         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 328         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 329         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 330         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 331
 332         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 333         ieee80211_tx_skb(sdata, skb);
 334 }
 335
 336 /* spectrum management related things */
 337 static void ieee80211_chswitch_work(struct work_struct *work)
 338 {
 339         struct ieee80211_sub_if_data *sdata =
 340                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 341         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 342
 343         if (!ieee80211_sdata_running(sdata))
 344                 return;
 345
 346         mutex_lock(&ifmgd->mtx);
 347         if (!ifmgd->associated)
 348                 goto out;
 349
 350         sdata->local->oper_channel = sdata->local->csa_channel;
 351         if (!sdata->local->ops->channel_switch) {
 352                 /* call "hw_config" only if doing sw channel switch */
 353                 ieee80211_hw_config(sdata->local,
 354                         IEEE80211_CONF_CHANGE_CHANNEL);
 355         }
 356
 357         /* XXX: shouldn't really modify cfg80211-owned data! */
 358         ifmgd->associated->channel = sdata->local->oper_channel;
 359
 360         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 361                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 362  out:
 363         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 364         mutex_unlock(&ifmgd->mtx);
 365 }
 366
 367 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 368 {
 369         struct ieee80211_sub_if_data *sdata;
 370         struct ieee80211_if_managed *ifmgd;
 371
 372         sdata = vif_to_sdata(vif);
 373         ifmgd = &sdata->u.mgd;
 374
 375         trace_api_chswitch_done(sdata, success);
 376         if (!success) {
 377                 /*
 378                  * If the channel switch was not successful, stay
 379                  * around on the old channel. We currently lack
 380                  * good handling of this situation, possibly we
 381                  * should just drop the association.
 382                  */
 383                 sdata->local->csa_channel = sdata->local->oper_channel;
 384         }
 385
 386         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 387 }
 388 EXPORT_SYMBOL(ieee80211_chswitch_done);
 389
 390 static void ieee80211_chswitch_timer(unsigned long data)
 391 {
 392         struct ieee80211_sub_if_data *sdata =
 393                 (struct ieee80211_sub_if_data *) data;
 394         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 395
 396         if (sdata->local->quiescing) {
 397                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 398                 return;
 399         }
 400
 401         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 402 }
 403
 404 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 405                                       struct ieee80211_channel_sw_ie *sw_elem,
 406                                       struct ieee80211_bss *bss,
 407                                       u64 timestamp)
 408 {
 409         struct cfg80211_bss *cbss =
 410                 container_of((void *)bss, struct cfg80211_bss, priv);
 411         struct ieee80211_channel *new_ch;
 412         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 413         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 414
 415         ASSERT_MGD_MTX(ifmgd);
 416
 417         if (!ifmgd->associated)
 418                 return;
 419
 420         if (sdata->local->scanning)
 421                 return;
 422
 423         /* Disregard subsequent beacons if we are already running a timer
 424            processing a CSA */
 425
 426         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 427                 return;
 428
 429         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 430         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 431                 return;
 432
 433         sdata->local->csa_channel = new_ch;
 434
 435         if (sdata->local->ops->channel_switch) {
 436                 /* use driver's channel switch callback */
 437                 struct ieee80211_channel_switch ch_switch;
 438                 memset(&ch_switch, 0, sizeof(ch_switch));
 439                 ch_switch.timestamp = timestamp;
 440                 if (sw_elem->mode) {
 441                         ch_switch.block_tx = true;
 442                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 443                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 444                 }
 445                 ch_switch.channel = new_ch;
 446                 ch_switch.count = sw_elem->count;
 447                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 448                 drv_channel_switch(sdata->local, &ch_switch);
 449                 return;
 450         }
 451
 452         /* channel switch handled in software */
 453         if (sw_elem->count <= 1) {
 454                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 455         } else {
 456                 if (sw_elem->mode)
 457                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 458                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 459                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 460                 mod_timer(&ifmgd->chswitch_timer,
 461                           jiffies +
 462                           msecs_to_jiffies(sw_elem->count *
 463                                            cbss->beacon_interval));
 464         }
 465 }
 466
 467 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 468                                         u16 capab_info, u8 *pwr_constr_elem,
 469                                         u8 pwr_constr_elem_len)
 470 {
 471         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 472
 473         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 474                 return;
 475
 476         /* Power constraint IE length should be 1 octet */
 477         if (pwr_constr_elem_len != 1)
 478                 return;
 479
 480         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 481             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 482                 sdata->local->power_constr_level = *pwr_constr_elem;
 483                 ieee80211_hw_config(sdata->local, 0);
 484         }
 485 }
 486
 487 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 488 {
 489         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 490         struct ieee80211_local *local = sdata->local;
 491         struct ieee80211_conf *conf = &local->hw.conf;
 492
 493         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 494                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 495                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 496
 497         local->disable_dynamic_ps = false;
 498         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 499 }
 500 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 501
 502 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 503 {
 504         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 505         struct ieee80211_local *local = sdata->local;
 506         struct ieee80211_conf *conf = &local->hw.conf;
 507
 508         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 509                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 510                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 511
 512         local->disable_dynamic_ps = true;
 513         conf->dynamic_ps_timeout = 0;
 514         del_timer_sync(&local->dynamic_ps_timer);
 515         ieee80211_queue_work(&local->hw,
 516                              &local->dynamic_ps_enable_work);
 517 }
 518 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 519
 520 /* powersave */
 521 static void ieee80211_enable_ps(struct ieee80211_local *local,
 522                                 struct ieee80211_sub_if_data *sdata)
 523 {
 524         struct ieee80211_conf *conf = &local->hw.conf;
 525
 526         /*
 527          * If we are scanning right now then the parameters will
 528          * take effect when scan finishes.
 529          */
 530         if (local->scanning)
 531                 return;
 532
 533         if (conf->dynamic_ps_timeout > 0 &&
 534             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 535                 mod_timer(&local->dynamic_ps_timer, jiffies +
 536                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 537         } else {
 538                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 539                         ieee80211_send_nullfunc(local, sdata, 1);
 540
 541                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 542                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 543                         return;
 544
 545                 conf->flags |= IEEE80211_CONF_PS;
 546                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 547         }
 548 }
 549
 550 static void ieee80211_change_ps(struct ieee80211_local *local)
 551 {
 552         struct ieee80211_conf *conf = &local->hw.conf;
 553
 554         if (local->ps_sdata) {
 555                 ieee80211_enable_ps(local, local->ps_sdata);
 556         } else if (conf->flags & IEEE80211_CONF_PS) {
 557                 conf->flags &= ~IEEE80211_CONF_PS;
 558                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 559                 del_timer_sync(&local->dynamic_ps_timer);
 560                 cancel_work_sync(&local->dynamic_ps_enable_work);
 561         }
 562 }
 563
 564 /* need to hold RTNL or interface lock */
 565 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 566 {
 567         struct ieee80211_sub_if_data *sdata, *found = NULL;
 568         int count = 0;
 569         int timeout;
 570
 571         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 572                 local->ps_sdata = NULL;
 573                 return;
 574         }
 575
 576         if (!list_empty(&local->work_list)) {
 577                 local->ps_sdata = NULL;
 578                 goto change;
 579         }
 580
 581         list_for_each_entry(sdata, &local->interfaces, list) {
 582                 if (!ieee80211_sdata_running(sdata))
 583                         continue;
 584                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 585                         continue;
 586                 found = sdata;
 587                 count++;
 588         }
 589
 590         if (count == 1 && found->u.mgd.powersave &&
 591             found->u.mgd.associated &&
 592             found->u.mgd.associated->beacon_ies &&
 593             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 594                                     IEEE80211_STA_CONNECTION_POLL))) {
 595                 struct ieee80211_conf *conf = &local->hw.conf;
 596                 s32 beaconint_us;
 597
 598                 if (latency < 0)
 599                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 600
 601                 beaconint_us = ieee80211_tu_to_usec(
 602                                         found->vif.bss_conf.beacon_int);
 603
 604                 timeout = local->dynamic_ps_forced_timeout;
 605                 if (timeout < 0) {
 606                         /*
 607                          * Go to full PSM if the user configures a very low
 608                          * latency requirement.
 609                          * The 2 second value is there for compatibility until
 610                          * the PM_QOS_NETWORK_LATENCY is configured with real
 611                          * values.
 612                          */
 613                         if (latency > 1900000000 && latency != 2000000000)
 614                                 timeout = 0;
 615                         else
 616                                 timeout = 100;
 617                 }
 618                 local->dynamic_ps_user_timeout = timeout;
 619                 if (!local->disable_dynamic_ps)
 620                         conf->dynamic_ps_timeout =
 621                                 local->dynamic_ps_user_timeout;
 622
 623                 if (beaconint_us > latency) {
 624                         local->ps_sdata = NULL;
 625                 } else {
 626                         struct ieee80211_bss *bss;
 627                         int maxslp = 1;
 628                         u8 dtimper;
 629
 630                         bss = (void *)found->u.mgd.associated->priv;
 631                         dtimper = bss->dtim_period;
 632
 633                         /* If the TIM IE is invalid, pretend the value is 1 */
 634                         if (!dtimper)
 635                                 dtimper = 1;
 636                         else if (dtimper > 1)
 637                                 maxslp = min_t(int, dtimper,
 638                                                     latency / beaconint_us);
 639
 640                         local->hw.conf.max_sleep_period = maxslp;
 641                         local->hw.conf.ps_dtim_period = dtimper;
 642                         local->ps_sdata = found;
 643                 }
 644         } else {
 645                 local->ps_sdata = NULL;
 646         }
 647
 648  change:
 649         ieee80211_change_ps(local);
 650 }
 651
 652 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 653 {
 654         struct ieee80211_local *local =
 655                 container_of(work, struct ieee80211_local,
 656                              dynamic_ps_disable_work);
 657
 658         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 659                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 660                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 661         }
 662
 663         ieee80211_wake_queues_by_reason(&local->hw,
 664                                         IEEE80211_QUEUE_STOP_REASON_PS);
 665 }
 666
 667 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 668 {
 669         struct ieee80211_local *local =
 670                 container_of(work, struct ieee80211_local,
 671                              dynamic_ps_enable_work);
 672         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 673         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 674
 675         /* can only happen when PS was just disabled anyway */
 676         if (!sdata)
 677                 return;
 678
 679         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 680                 return;
 681
 682         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 683             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 684                 ieee80211_send_nullfunc(local, sdata, 1);
 685
 686         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 687               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 688             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 689                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 690                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 691                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 692         }
 693 }
 694
 695 void ieee80211_dynamic_ps_timer(unsigned long data)
 696 {
 697         struct ieee80211_local *local = (void *) data;
 698
 699         if (local->quiescing || local->suspended)
 700                 return;
 701
 702         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 703 }
 704
 705 /* MLME */
 706 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 707                                      struct ieee80211_sub_if_data *sdata,
 708                                      u8 *wmm_param, size_t wmm_param_len)
 709 {
 710         struct ieee80211_tx_queue_params params;
 711         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 712         size_t left;
 713         int count;
 714         u8 *pos, uapsd_queues = 0;
 715
 716         if (!local->ops->conf_tx)
 717                 return;
 718
 719         if (local->hw.queues < 4)
 720                 return;
 721
 722         if (!wmm_param)
 723                 return;
 724
 725         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 726                 return;
 727
 728         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 729                 uapsd_queues = local->uapsd_queues;
 730
 731         count = wmm_param[6] & 0x0f;
 732         if (count == ifmgd->wmm_last_param_set)
 733                 return;
 734         ifmgd->wmm_last_param_set = count;
 735
 736         pos = wmm_param + 8;
 737         left = wmm_param_len - 8;
 738
 739         memset(&params, 0, sizeof(params));
 740
 741         local->wmm_acm = 0;
 742         for (; left >= 4; left -= 4, pos += 4) {
 743                 int aci = (pos[0] >> 5) & 0x03;
 744                 int acm = (pos[0] >> 4) & 0x01;
 745                 bool uapsd = false;
 746                 int queue;
 747
 748                 switch (aci) {
 749                 case 1: /* AC_BK */
 750                         queue = 3;
 751                         if (acm)
 752                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 753                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 754                                 uapsd = true;
 755                         break;
 756                 case 2: /* AC_VI */
 757                         queue = 1;
 758                         if (acm)
 759                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 760                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 761                                 uapsd = true;
 762                         break;
 763                 case 3: /* AC_VO */
 764                         queue = 0;
 765                         if (acm)
 766                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 767                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 768                                 uapsd = true;
 769                         break;
 770                 case 0: /* AC_BE */
 771                 default:
 772                         queue = 2;
 773                         if (acm)
 774                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 775                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 776                                 uapsd = true;
 777                         break;
 778                 }
 779
 780                 params.aifs = pos[0] & 0x0f;
 781                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 782                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 783                 params.txop = get_unaligned_le16(pos + 2);
 784                 params.uapsd = uapsd;
 785
 786 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 787                 wiphy_debug(local->hw.wiphy,
 788                             "WMM queue=%d aci=%d acm=%d aifs=%d "
 789                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 790                             queue, aci, acm,
 791                             params.aifs, params.cw_min, params.cw_max,
 792                             params.txop, params.uapsd);
 793 #endif
 794                 if (drv_conf_tx(local, queue, &params))
 795                         wiphy_debug(local->hw.wiphy,
 796                                     "failed to set TX queue parameters for queue %d\n",
 797                                     queue);
 798         }
 799
 800         /* enable WMM or activate new settings */
 801         sdata->vif.bss_conf.qos = true;
 802         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 803 }
 804
 805 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 806                                            u16 capab, bool erp_valid, u8 erp)
 807 {
 808         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 809         u32 changed = 0;
 810         bool use_protection;
 811         bool use_short_preamble;
 812         bool use_short_slot;
 813
 814         if (erp_valid) {
 815                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 816                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 817         } else {
 818                 use_protection = false;
 819                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 820         }
 821
 822         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 823         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 824                 use_short_slot = true;
 825
 826         if (use_protection != bss_conf->use_cts_prot) {
 827                 bss_conf->use_cts_prot = use_protection;
 828                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 829         }
 830
 831         if (use_short_preamble != bss_conf->use_short_preamble) {
 832                 bss_conf->use_short_preamble = use_short_preamble;
 833                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 834         }
 835
 836         if (use_short_slot != bss_conf->use_short_slot) {
 837                 bss_conf->use_short_slot = use_short_slot;
 838                 changed |= BSS_CHANGED_ERP_SLOT;
 839         }
 840
 841         return changed;
 842 }
 843
 844 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 845                                      struct cfg80211_bss *cbss,
 846                                      u32 bss_info_changed)
 847 {
 848         struct ieee80211_bss *bss = (void *)cbss->priv;
 849         struct ieee80211_local *local = sdata->local;
 850         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 851
 852         bss_info_changed |= BSS_CHANGED_ASSOC;
 853         /* set timing information */
 854         bss_conf->beacon_int = cbss->beacon_interval;
 855         bss_conf->timestamp = cbss->tsf;
 856
 857         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 858         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 859                 cbss->capability, bss->has_erp_value, bss->erp_value);
 860
 861         sdata->u.mgd.associated = cbss;
 862         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 863
 864         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 865
 866         /* just to be sure */
 867         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 868                                 IEEE80211_STA_BEACON_POLL);
 869
 870         /*
 871          * Always handle WMM once after association regardless
 872          * of the first value the AP uses. Setting -1 here has
 873          * that effect because the AP values is an unsigned
 874          * 4-bit value.
 875          */
 876         sdata->u.mgd.wmm_last_param_set = -1;
 877
 878         ieee80211_led_assoc(local, 1);
 879
 880         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
 881                 bss_conf->dtim_period = bss->dtim_period;
 882         else
 883                 bss_conf->dtim_period = 0;
 884
 885         bss_conf->assoc = 1;
 886         /*
 887          * For now just always ask the driver to update the basic rateset
 888          * when we have associated, we aren't checking whether it actually
 889          * changed or not.
 890          */
 891         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 892
 893         /* And the BSSID changed - we're associated now */
 894         bss_info_changed |= BSS_CHANGED_BSSID;
 895
 896         /* Tell the driver to monitor connection quality (if supported) */
 897         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 898             bss_conf->cqm_rssi_thold)
 899                 bss_info_changed |= BSS_CHANGED_CQM;
 900
 901         /* Enable ARP filtering */
 902         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
 903                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 904                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
 905         }
 906
 907         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 908
 909         mutex_lock(&local->iflist_mtx);
 910         ieee80211_recalc_ps(local, -1);
 911         ieee80211_recalc_smps(local, sdata);
 912         mutex_unlock(&local->iflist_mtx);
 913
 914         netif_tx_start_all_queues(sdata->dev);
 915         netif_carrier_on(sdata->dev);
 916 }
 917
 918 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 919                                    bool remove_sta)
 920 {
 921         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 922         struct ieee80211_local *local = sdata->local;
 923         struct sta_info *sta;
 924         u32 changed = 0, config_changed = 0;
 925         u8 bssid[ETH_ALEN];
 926
 927         ASSERT_MGD_MTX(ifmgd);
 928
 929         if (WARN_ON(!ifmgd->associated))
 930                 return;
 931
 932         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 933
 934         ifmgd->associated = NULL;
 935         memset(ifmgd->bssid, 0, ETH_ALEN);
 936
 937         /*
 938          * we need to commit the associated = NULL change because the
 939          * scan code uses that to determine whether this iface should
 940          * go to/wake up from powersave or not -- and could otherwise
 941          * wake the queues erroneously.
 942          */
 943         smp_mb();
 944
 945         /*
 946          * Thus, we can only afterwards stop the queues -- to account
 947          * for the case where another CPU is finishing a scan at this
 948          * time -- we don't want the scan code to enable queues.
 949          */
 950
 951         netif_tx_stop_all_queues(sdata->dev);
 952         netif_carrier_off(sdata->dev);
 953
 954         mutex_lock(&local->sta_mtx);
 955         sta = sta_info_get(sdata, bssid);
 956         if (sta) {
 957                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
 958                 ieee80211_sta_tear_down_BA_sessions(sta);
 959         }
 960         mutex_unlock(&local->sta_mtx);
 961
 962         changed |= ieee80211_reset_erp_info(sdata);
 963
 964         ieee80211_led_assoc(local, 0);
 965         changed |= BSS_CHANGED_ASSOC;
 966         sdata->vif.bss_conf.assoc = false;
 967
 968         ieee80211_set_wmm_default(sdata);
 969
 970         /* channel(_type) changes are handled by ieee80211_hw_config */
 971         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
 972
 973         /* on the next assoc, re-program HT parameters */
 974         sdata->ht_opmode_valid = false;
 975
 976         local->power_constr_level = 0;
 977
 978         del_timer_sync(&local->dynamic_ps_timer);
 979         cancel_work_sync(&local->dynamic_ps_enable_work);
 980
 981         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 982                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 983                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 984         }
 985
 986         ieee80211_hw_config(local, config_changed);
 987
 988         /* Disable ARP filtering */
 989         if (sdata->vif.bss_conf.arp_filter_enabled) {
 990                 sdata->vif.bss_conf.arp_filter_enabled = false;
 991                 changed |= BSS_CHANGED_ARP_FILTER;
 992         }
 993
 994         /* The BSSID (not really interesting) and HT changed */
 995         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
 996         ieee80211_bss_info_change_notify(sdata, changed);
 997
 998         if (remove_sta)
 999                 sta_info_destroy_addr(sdata, bssid);
1000
1001         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1002         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1003         del_timer_sync(&sdata->u.mgd.timer);
1004         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1005 }
1006
1007 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1008                              struct ieee80211_hdr *hdr)
1009 {
1010         /*
1011          * We can postpone the mgd.timer whenever receiving unicast frames
1012          * from AP because we know that the connection is working both ways
1013          * at that time. But multicast frames (and hence also beacons) must
1014          * be ignored here, because we need to trigger the timer during
1015          * data idle periods for sending the periodic probe request to the
1016          * AP we're connected to.
1017          */
1018         if (is_multicast_ether_addr(hdr->addr1))
1019                 return;
1020
1021         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1022                 return;
1023
1024         mod_timer(&sdata->u.mgd.conn_mon_timer,
1025                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1026 }
1027
1028 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1029 {
1030         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1031         const u8 *ssid;
1032
1033         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1034         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
1035                                  ssid + 2, ssid[1], NULL, 0);
1036
1037         ifmgd->probe_send_count++;
1038         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1039         run_again(ifmgd, ifmgd->probe_timeout);
1040 }
1041
1042 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1043                                    bool beacon)
1044 {
1045         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1046         bool already = false;
1047
1048         if (!ieee80211_sdata_running(sdata))
1049                 return;
1050
1051         if (sdata->local->scanning)
1052                 return;
1053
1054         if (sdata->local->tmp_channel)
1055                 return;
1056
1057         mutex_lock(&ifmgd->mtx);
1058
1059         if (!ifmgd->associated)
1060                 goto out;
1061
1062 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1063         if (beacon && net_ratelimit())
1064                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1065                        "- sending probe request\n", sdata->name);
1066 #endif
1067
1068         /*
1069          * The driver/our work has already reported this event or the
1070          * connection monitoring has kicked in and we have already sent
1071          * a probe request. Or maybe the AP died and the driver keeps
1072          * reporting until we disassociate...
1073          *
1074          * In either case we have to ignore the current call to this
1075          * function (except for setting the correct probe reason bit)
1076          * because otherwise we would reset the timer every time and
1077          * never check whether we received a probe response!
1078          */
1079         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1080                             IEEE80211_STA_CONNECTION_POLL))
1081                 already = true;
1082
1083         if (beacon)
1084                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1085         else
1086                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1087
1088         if (already)
1089                 goto out;
1090
1091         mutex_lock(&sdata->local->iflist_mtx);
1092         ieee80211_recalc_ps(sdata->local, -1);
1093         mutex_unlock(&sdata->local->iflist_mtx);
1094
1095         ifmgd->probe_send_count = 0;
1096         ieee80211_mgd_probe_ap_send(sdata);
1097  out:
1098         mutex_unlock(&ifmgd->mtx);
1099 }
1100
1101 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1102 {
1103         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1104         struct ieee80211_local *local = sdata->local;
1105         u8 bssid[ETH_ALEN];
1106
1107         mutex_lock(&ifmgd->mtx);
1108         if (!ifmgd->associated) {
1109                 mutex_unlock(&ifmgd->mtx);
1110                 return;
1111         }
1112
1113         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1114
1115         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1116
1117         ieee80211_set_disassoc(sdata, true);
1118         mutex_unlock(&ifmgd->mtx);
1119
1120         mutex_lock(&local->mtx);
1121         ieee80211_recalc_idle(local);
1122         mutex_unlock(&local->mtx);
1123         /*
1124          * must be outside lock due to cfg80211,
1125          * but that's not a problem.
1126          */
1127         ieee80211_send_deauth_disassoc(sdata, bssid,
1128                                        IEEE80211_STYPE_DEAUTH,
1129                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1130                                        NULL, true);
1131 }
1132
1133 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1134 {
1135         struct ieee80211_sub_if_data *sdata =
1136                 container_of(work, struct ieee80211_sub_if_data,
1137                              u.mgd.beacon_connection_loss_work);
1138
1139         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1140                 __ieee80211_connection_loss(sdata);
1141         else
1142                 ieee80211_mgd_probe_ap(sdata, true);
1143 }
1144
1145 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1146 {
1147         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1148         struct ieee80211_hw *hw = &sdata->local->hw;
1149
1150         trace_api_beacon_loss(sdata);
1151
1152         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1153         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1154 }
1155 EXPORT_SYMBOL(ieee80211_beacon_loss);
1156
1157 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1158 {
1159         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1160         struct ieee80211_hw *hw = &sdata->local->hw;
1161
1162         trace_api_connection_loss(sdata);
1163
1164         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1165         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1166 }
1167 EXPORT_SYMBOL(ieee80211_connection_loss);
1168
1169
1170 static enum rx_mgmt_action __must_check
1171 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1172                          struct ieee80211_mgmt *mgmt, size_t len)
1173 {
1174         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1175         const u8 *bssid = NULL;
1176         u16 reason_code;
1177
1178         if (len < 24 + 2)
1179                 return RX_MGMT_NONE;
1180
1181         ASSERT_MGD_MTX(ifmgd);
1182
1183         bssid = ifmgd->associated->bssid;
1184
1185         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1186
1187         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1188                         sdata->name, bssid, reason_code);
1189
1190         ieee80211_set_disassoc(sdata, true);
1191         mutex_lock(&sdata->local->mtx);
1192         ieee80211_recalc_idle(sdata->local);
1193         mutex_unlock(&sdata->local->mtx);
1194
1195         return RX_MGMT_CFG80211_DEAUTH;
1196 }
1197
1198
1199 static enum rx_mgmt_action __must_check
1200 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1201                            struct ieee80211_mgmt *mgmt, size_t len)
1202 {
1203         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1204         u16 reason_code;
1205
1206         if (len < 24 + 2)
1207                 return RX_MGMT_NONE;
1208
1209         ASSERT_MGD_MTX(ifmgd);
1210
1211         if (WARN_ON(!ifmgd->associated))
1212                 return RX_MGMT_NONE;
1213
1214         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1215                 return RX_MGMT_NONE;
1216
1217         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1218
1219         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1220                         sdata->name, mgmt->sa, reason_code);
1221
1222         ieee80211_set_disassoc(sdata, true);
1223         mutex_lock(&sdata->local->mtx);
1224         ieee80211_recalc_idle(sdata->local);
1225         mutex_unlock(&sdata->local->mtx);
1226         return RX_MGMT_CFG80211_DISASSOC;
1227 }
1228
1229
1230 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1231                                     struct ieee80211_mgmt *mgmt, size_t len)
1232 {
1233         struct ieee80211_sub_if_data *sdata = wk->sdata;
1234         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1235         struct ieee80211_local *local = sdata->local;
1236         struct ieee80211_supported_band *sband;
1237         struct sta_info *sta;
1238         struct cfg80211_bss *cbss = wk->assoc.bss;
1239         u8 *pos;
1240         u32 rates, basic_rates;
1241         u16 capab_info, aid;
1242         struct ieee802_11_elems elems;
1243         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1244         u32 changed = 0;
1245         int i, j, err;
1246         bool have_higher_than_11mbit = false;
1247         u16 ap_ht_cap_flags;
1248
1249         /* AssocResp and ReassocResp have identical structure */
1250
1251         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1252         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1253
1254         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1255                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1256                        "set\n", sdata->name, aid);
1257         aid &= ~(BIT(15) | BIT(14));
1258
1259         pos = mgmt->u.assoc_resp.variable;
1260         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1261
1262         if (!elems.supp_rates) {
1263                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1264                        sdata->name);
1265                 return false;
1266         }
1267
1268         ifmgd->aid = aid;
1269
1270         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1271         if (!sta) {
1272                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1273                        " the AP\n", sdata->name);
1274                 return false;
1275         }
1276
1277         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1278                            WLAN_STA_ASSOC_AP);
1279         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1280                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1281
1282         rates = 0;
1283         basic_rates = 0;
1284         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1285
1286         for (i = 0; i < elems.supp_rates_len; i++) {
1287                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1288                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1289
1290                 if (rate > 110)
1291                         have_higher_than_11mbit = true;
1292
1293                 for (j = 0; j < sband->n_bitrates; j++) {
1294                         if (sband->bitrates[j].bitrate == rate) {
1295                                 rates |= BIT(j);
1296                                 if (is_basic)
1297                                         basic_rates |= BIT(j);
1298                                 break;
1299                         }
1300                 }
1301         }
1302
1303         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1304                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1305                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1306
1307                 if (rate > 110)
1308                         have_higher_than_11mbit = true;
1309
1310                 for (j = 0; j < sband->n_bitrates; j++) {
1311                         if (sband->bitrates[j].bitrate == rate) {
1312                                 rates |= BIT(j);
1313                                 if (is_basic)
1314                                         basic_rates |= BIT(j);
1315                                 break;
1316                         }
1317                 }
1318         }
1319
1320         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1321         sdata->vif.bss_conf.basic_rates = basic_rates;
1322
1323         /* cf. IEEE 802.11 9.2.12 */
1324         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1325             have_higher_than_11mbit)
1326                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1327         else
1328                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1329
1330         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1331                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1332                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1333
1334         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1335
1336         rate_control_rate_init(sta);
1337
1338         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1339                 set_sta_flags(sta, WLAN_STA_MFP);
1340
1341         if (elems.wmm_param)
1342                 set_sta_flags(sta, WLAN_STA_WME);
1343
1344         err = sta_info_insert(sta);
1345         sta = NULL;
1346         if (err) {
1347                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1348                        " the AP (error %d)\n", sdata->name, err);
1349                 return false;
1350         }
1351
1352         if (elems.wmm_param)
1353                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1354                                          elems.wmm_param_len);
1355         else
1356                 ieee80211_set_wmm_default(sdata);
1357
1358         local->oper_channel = wk->chan;
1359
1360         if (elems.ht_info_elem && elems.wmm_param &&
1361             (sdata->local->hw.queues >= 4) &&
1362             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1363                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1364                                                cbss->bssid, ap_ht_cap_flags);
1365
1366         /* set AID and assoc capability,
1367          * ieee80211_set_associated() will tell the driver */
1368         bss_conf->aid = aid;
1369         bss_conf->assoc_capability = capab_info;
1370         ieee80211_set_associated(sdata, cbss, changed);
1371
1372         /*
1373          * If we're using 4-addr mode, let the AP know that we're
1374          * doing so, so that it can create the STA VLAN on its side
1375          */
1376         if (ifmgd->use_4addr)
1377                 ieee80211_send_4addr_nullfunc(local, sdata);
1378
1379         /*
1380          * Start timer to probe the connection to the AP now.
1381          * Also start the timer that will detect beacon loss.
1382          */
1383         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1384         mod_beacon_timer(sdata);
1385
1386         return true;
1387 }
1388
1389
1390 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1391                                   struct ieee80211_mgmt *mgmt,
1392                                   size_t len,
1393                                   struct ieee80211_rx_status *rx_status,
1394                                   struct ieee802_11_elems *elems,
1395                                   bool beacon)
1396 {
1397         struct ieee80211_local *local = sdata->local;
1398         int freq;
1399         struct ieee80211_bss *bss;
1400         struct ieee80211_channel *channel;
1401         bool need_ps = false;
1402
1403         if (sdata->u.mgd.associated) {
1404                 bss = (void *)sdata->u.mgd.associated->priv;
1405                 /* not previously set so we may need to recalc */
1406                 need_ps = !bss->dtim_period;
1407         }
1408
1409         if (elems->ds_params && elems->ds_params_len == 1)
1410                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1411         else
1412                 freq = rx_status->freq;
1413
1414         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1415
1416         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1417                 return;
1418
1419         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1420                                         channel, beacon);
1421         if (bss)
1422                 ieee80211_rx_bss_put(local, bss);
1423
1424         if (!sdata->u.mgd.associated)
1425                 return;
1426
1427         if (need_ps) {
1428                 mutex_lock(&local->iflist_mtx);
1429                 ieee80211_recalc_ps(local, -1);
1430                 mutex_unlock(&local->iflist_mtx);
1431         }
1432
1433         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1434             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1435                                                         ETH_ALEN) == 0)) {
1436                 struct ieee80211_channel_sw_ie *sw_elem =
1437                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1438                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1439                                                  bss, rx_status->mactime);
1440         }
1441 }
1442
1443
1444 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1445                                          struct sk_buff *skb)
1446 {
1447         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1448         struct ieee80211_if_managed *ifmgd;
1449         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1450         size_t baselen, len = skb->len;
1451         struct ieee802_11_elems elems;
1452
1453         ifmgd = &sdata->u.mgd;
1454
1455         ASSERT_MGD_MTX(ifmgd);
1456
1457         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1458                 return; /* ignore ProbeResp to foreign address */
1459
1460         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1461         if (baselen > len)
1462                 return;
1463
1464         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1465                                 &elems);
1466
1467         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1468
1469         if (ifmgd->associated &&
1470             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1471             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1472                             IEEE80211_STA_CONNECTION_POLL)) {
1473                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1474                                   IEEE80211_STA_BEACON_POLL);
1475                 mutex_lock(&sdata->local->iflist_mtx);
1476                 ieee80211_recalc_ps(sdata->local, -1);
1477                 mutex_unlock(&sdata->local->iflist_mtx);
1478
1479                 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1480                         return;
1481
1482                 /*
1483                  * We've received a probe response, but are not sure whether
1484                  * we have or will be receiving any beacons or data, so let's
1485                  * schedule the timers again, just in case.
1486                  */
1487                 mod_beacon_timer(sdata);
1488
1489                 mod_timer(&ifmgd->conn_mon_timer,
1490                           round_jiffies_up(jiffies +
1491                                            IEEE80211_CONNECTION_IDLE_TIME));
1492         }
1493 }
1494
1495 /*
1496  * This is the canonical list of information elements we care about,
1497  * the filter code also gives us all changes to the Microsoft OUI
1498  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1499  *
1500  * We implement beacon filtering in software since that means we can
1501  * avoid processing the frame here and in cfg80211, and userspace
1502  * will not be able to tell whether the hardware supports it or not.
1503  *
1504  * XXX: This list needs to be dynamic -- userspace needs to be able to
1505  *      add items it requires. It also needs to be able to tell us to
1506  *      look out for other vendor IEs.
1507  */
1508 static const u64 care_about_ies =
1509         (1ULL << WLAN_EID_COUNTRY) |
1510         (1ULL << WLAN_EID_ERP_INFO) |
1511         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1512         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1513         (1ULL << WLAN_EID_HT_CAPABILITY) |
1514         (1ULL << WLAN_EID_HT_INFORMATION);
1515
1516 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1517                                      struct ieee80211_mgmt *mgmt,
1518                                      size_t len,
1519                                      struct ieee80211_rx_status *rx_status)
1520 {
1521         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1522         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1523         size_t baselen;
1524         struct ieee802_11_elems elems;
1525         struct ieee80211_local *local = sdata->local;
1526         u32 changed = 0;
1527         bool erp_valid, directed_tim = false;
1528         u8 erp_value = 0;
1529         u32 ncrc;
1530         u8 *bssid;
1531
1532         ASSERT_MGD_MTX(ifmgd);
1533
1534         /* Process beacon from the current BSS */
1535         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1536         if (baselen > len)
1537                 return;
1538
1539         if (rx_status->freq != local->hw.conf.channel->center_freq)
1540                 return;
1541
1542         /*
1543          * We might have received a number of frames, among them a
1544          * disassoc frame and a beacon...
1545          */
1546         if (!ifmgd->associated)
1547                 return;
1548
1549         bssid = ifmgd->associated->bssid;
1550
1551         /*
1552          * And in theory even frames from a different AP we were just
1553          * associated to a split-second ago!
1554          */
1555         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1556                 return;
1557
1558         /* Track average RSSI from the Beacon frames of the current AP */
1559         ifmgd->last_beacon_signal = rx_status->signal;
1560         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1561                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1562                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1563                 ifmgd->last_cqm_event_signal = 0;
1564                 ifmgd->count_beacon_signal = 1;
1565         } else {
1566                 ifmgd->ave_beacon_signal =
1567                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1568                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1569                          ifmgd->ave_beacon_signal) / 16;
1570                 ifmgd->count_beacon_signal++;
1571         }
1572         if (bss_conf->cqm_rssi_thold &&
1573             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1574             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1575                 int sig = ifmgd->ave_beacon_signal / 16;
1576                 int last_event = ifmgd->last_cqm_event_signal;
1577                 int thold = bss_conf->cqm_rssi_thold;
1578                 int hyst = bss_conf->cqm_rssi_hyst;
1579                 if (sig < thold &&
1580                     (last_event == 0 || sig < last_event - hyst)) {
1581                         ifmgd->last_cqm_event_signal = sig;
1582                         ieee80211_cqm_rssi_notify(
1583                                 &sdata->vif,
1584                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1585                                 GFP_KERNEL);
1586                 } else if (sig > thold &&
1587                            (last_event == 0 || sig > last_event + hyst)) {
1588                         ifmgd->last_cqm_event_signal = sig;
1589                         ieee80211_cqm_rssi_notify(
1590                                 &sdata->vif,
1591                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1592                                 GFP_KERNEL);
1593                 }
1594         }
1595
1596         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1597 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1598                 if (net_ratelimit()) {
1599                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1600                                "to a received beacon\n", sdata->name);
1601                 }
1602 #endif
1603                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1604                 mutex_lock(&local->iflist_mtx);
1605                 ieee80211_recalc_ps(local, -1);
1606                 mutex_unlock(&local->iflist_mtx);
1607         }
1608
1609         /*
1610          * Push the beacon loss detection into the future since
1611          * we are processing a beacon from the AP just now.
1612          */
1613         mod_beacon_timer(sdata);
1614
1615         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1616         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1617                                           len - baselen, &elems,
1618                                           care_about_ies, ncrc);
1619
1620         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1621                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1622                                                    ifmgd->aid);
1623
1624         if (ncrc != ifmgd->beacon_crc) {
1625                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1626                                       true);
1627
1628                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1629                                          elems.wmm_param_len);
1630         }
1631
1632         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1633                 if (directed_tim) {
1634                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1635                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1636                                 ieee80211_hw_config(local,
1637                                                     IEEE80211_CONF_CHANGE_PS);
1638                                 ieee80211_send_nullfunc(local, sdata, 0);
1639                         } else {
1640                                 local->pspolling = true;
1641
1642                                 /*
1643                                  * Here is assumed that the driver will be
1644                                  * able to send ps-poll frame and receive a
1645                                  * response even though power save mode is
1646                                  * enabled, but some drivers might require
1647                                  * to disable power save here. This needs
1648                                  * to be investigated.
1649                                  */
1650                                 ieee80211_send_pspoll(local, sdata);
1651                         }
1652                 }
1653         }
1654
1655         if (ncrc == ifmgd->beacon_crc)
1656                 return;
1657         ifmgd->beacon_crc = ncrc;
1658
1659         if (elems.erp_info && elems.erp_info_len >= 1) {
1660                 erp_valid = true;
1661                 erp_value = elems.erp_info[0];
1662         } else {
1663                 erp_valid = false;
1664         }
1665         changed |= ieee80211_handle_bss_capability(sdata,
1666                         le16_to_cpu(mgmt->u.beacon.capab_info),
1667                         erp_valid, erp_value);
1668
1669
1670         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1671             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1672                 struct sta_info *sta;
1673                 struct ieee80211_supported_band *sband;
1674                 u16 ap_ht_cap_flags;
1675
1676                 rcu_read_lock();
1677
1678                 sta = sta_info_get(sdata, bssid);
1679                 if (WARN_ON(!sta)) {
1680                         rcu_read_unlock();
1681                         return;
1682                 }
1683
1684                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1685
1686                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1687                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1688
1689                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1690
1691                 rcu_read_unlock();
1692
1693                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1694                                                bssid, ap_ht_cap_flags);
1695         }
1696
1697         /* Note: country IE parsing is done for us by cfg80211 */
1698         if (elems.country_elem) {
1699                 /* TODO: IBSS also needs this */
1700                 if (elems.pwr_constr_elem)
1701                         ieee80211_handle_pwr_constr(sdata,
1702                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1703                                 elems.pwr_constr_elem,
1704                                 elems.pwr_constr_elem_len);
1705         }
1706
1707         ieee80211_bss_info_change_notify(sdata, changed);
1708 }
1709
1710 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1711                                   struct sk_buff *skb)
1712 {
1713         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1714         struct ieee80211_rx_status *rx_status;
1715         struct ieee80211_mgmt *mgmt;
1716         enum rx_mgmt_action rma = RX_MGMT_NONE;
1717         u16 fc;
1718
1719         rx_status = (struct ieee80211_rx_status *) skb->cb;
1720         mgmt = (struct ieee80211_mgmt *) skb->data;
1721         fc = le16_to_cpu(mgmt->frame_control);
1722
1723         mutex_lock(&ifmgd->mtx);
1724
1725         if (ifmgd->associated &&
1726             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1727                 switch (fc & IEEE80211_FCTL_STYPE) {
1728                 case IEEE80211_STYPE_BEACON:
1729                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1730                                                  rx_status);
1731                         break;
1732                 case IEEE80211_STYPE_PROBE_RESP:
1733                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1734                         break;
1735                 case IEEE80211_STYPE_DEAUTH:
1736                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1737                         break;
1738                 case IEEE80211_STYPE_DISASSOC:
1739                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1740                         break;
1741                 case IEEE80211_STYPE_ACTION:
1742                         switch (mgmt->u.action.category) {
1743                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1744                                 ieee80211_sta_process_chanswitch(sdata,
1745                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1746                                                 (void *)ifmgd->associated->priv,
1747                                                 rx_status->mactime);
1748                                 break;
1749                         }
1750                 }
1751                 mutex_unlock(&ifmgd->mtx);
1752
1753                 switch (rma) {
1754                 case RX_MGMT_NONE:
1755                         /* no action */
1756                         break;
1757                 case RX_MGMT_CFG80211_DEAUTH:
1758                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1759                         break;
1760                 case RX_MGMT_CFG80211_DISASSOC:
1761                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1762                         break;
1763                 default:
1764                         WARN(1, "unexpected: %d", rma);
1765                 }
1766                 return;
1767         }
1768
1769         mutex_unlock(&ifmgd->mtx);
1770
1771         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1772             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1773                 struct ieee80211_local *local = sdata->local;
1774                 struct ieee80211_work *wk;
1775
1776                 mutex_lock(&local->mtx);
1777                 list_for_each_entry(wk, &local->work_list, list) {
1778                         if (wk->sdata != sdata)
1779                                 continue;
1780
1781                         if (wk->type != IEEE80211_WORK_ASSOC &&
1782                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1783                                 continue;
1784
1785                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1786                                 continue;
1787                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1788                                 continue;
1789
1790                         /*
1791                          * Printing the message only here means we can't
1792                          * spuriously print it, but it also means that it
1793                          * won't be printed when the frame comes in before
1794                          * we even tried to associate or in similar cases.
1795                          *
1796                          * Ultimately, I suspect cfg80211 should print the
1797                          * messages instead.
1798                          */
1799                         printk(KERN_DEBUG
1800                                "%s: deauthenticated from %pM (Reason: %u)\n",
1801                                sdata->name, mgmt->bssid,
1802                                le16_to_cpu(mgmt->u.deauth.reason_code));
1803
1804                         list_del_rcu(&wk->list);
1805                         free_work(wk);
1806                         break;
1807                 }
1808                 mutex_unlock(&local->mtx);
1809
1810                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1811         }
1812 }
1813
1814 static void ieee80211_sta_timer(unsigned long data)
1815 {
1816         struct ieee80211_sub_if_data *sdata =
1817                 (struct ieee80211_sub_if_data *) data;
1818         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1819         struct ieee80211_local *local = sdata->local;
1820
1821         if (local->quiescing) {
1822                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1823                 return;
1824         }
1825
1826         ieee80211_queue_work(&local->hw, &sdata->work);
1827 }
1828
1829 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
1830 {
1831         struct ieee80211_local *local = sdata->local;
1832         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1833
1834         /* then process the rest of the work */
1835         mutex_lock(&ifmgd->mtx);
1836
1837         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1838                             IEEE80211_STA_CONNECTION_POLL) &&
1839             ifmgd->associated) {
1840                 u8 bssid[ETH_ALEN];
1841
1842                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1843                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1844                         run_again(ifmgd, ifmgd->probe_timeout);
1845
1846                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1847 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1848                         printk(KERN_DEBUG "No probe response from AP %pM"
1849                                 " after %dms, try %d\n", bssid,
1850                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1851                                 ifmgd->probe_send_count);
1852 #endif
1853                         ieee80211_mgd_probe_ap_send(sdata);
1854                 } else {
1855                         /*
1856                          * We actually lost the connection ... or did we?
1857                          * Let's make sure!
1858                          */
1859                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1860                                           IEEE80211_STA_BEACON_POLL);
1861                         printk(KERN_DEBUG "No probe response from AP %pM"
1862                                 " after %dms, disconnecting.\n",
1863                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1864                         ieee80211_set_disassoc(sdata, true);
1865                         mutex_unlock(&ifmgd->mtx);
1866                         mutex_lock(&local->mtx);
1867                         ieee80211_recalc_idle(local);
1868                         mutex_unlock(&local->mtx);
1869                         /*
1870                          * must be outside lock due to cfg80211,
1871                          * but that's not a problem.
1872                          */
1873                         ieee80211_send_deauth_disassoc(sdata, bssid,
1874                                         IEEE80211_STYPE_DEAUTH,
1875                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1876                                         NULL, true);
1877                         mutex_lock(&ifmgd->mtx);
1878                 }
1879         }
1880
1881         mutex_unlock(&ifmgd->mtx);
1882 }
1883
1884 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1885 {
1886         struct ieee80211_sub_if_data *sdata =
1887                 (struct ieee80211_sub_if_data *) data;
1888         struct ieee80211_local *local = sdata->local;
1889
1890         if (local->quiescing)
1891                 return;
1892
1893         ieee80211_queue_work(&sdata->local->hw,
1894                              &sdata->u.mgd.beacon_connection_loss_work);
1895 }
1896
1897 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1898 {
1899         struct ieee80211_sub_if_data *sdata =
1900                 (struct ieee80211_sub_if_data *) data;
1901         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1902         struct ieee80211_local *local = sdata->local;
1903
1904         if (local->quiescing)
1905                 return;
1906
1907         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1908 }
1909
1910 static void ieee80211_sta_monitor_work(struct work_struct *work)
1911 {
1912         struct ieee80211_sub_if_data *sdata =
1913                 container_of(work, struct ieee80211_sub_if_data,
1914                              u.mgd.monitor_work);
1915
1916         ieee80211_mgd_probe_ap(sdata, false);
1917 }
1918
1919 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1920 {
1921         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1922                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1923                                         IEEE80211_STA_CONNECTION_POLL);
1924
1925                 /* let's probe the connection once */
1926                 ieee80211_queue_work(&sdata->local->hw,
1927                            &sdata->u.mgd.monitor_work);
1928                 /* and do all the other regular work too */
1929                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1930         }
1931 }
1932
1933 #ifdef CONFIG_PM
1934 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1935 {
1936         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1937
1938         /*
1939          * we need to use atomic bitops for the running bits
1940          * only because both timers might fire at the same
1941          * time -- the code here is properly synchronised.
1942          */
1943
1944         cancel_work_sync(&ifmgd->request_smps_work);
1945
1946         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1947         if (del_timer_sync(&ifmgd->timer))
1948                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1949
1950         cancel_work_sync(&ifmgd->chswitch_work);
1951         if (del_timer_sync(&ifmgd->chswitch_timer))
1952                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1953
1954         cancel_work_sync(&ifmgd->monitor_work);
1955         /* these will just be re-established on connection */
1956         del_timer_sync(&ifmgd->conn_mon_timer);
1957         del_timer_sync(&ifmgd->bcn_mon_timer);
1958 }
1959
1960 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1961 {
1962         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1963
1964         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1965                 add_timer(&ifmgd->timer);
1966         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1967                 add_timer(&ifmgd->chswitch_timer);
1968 }
1969 #endif
1970
1971 /* interface setup */
1972 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1973 {
1974         struct ieee80211_if_managed *ifmgd;
1975
1976         ifmgd = &sdata->u.mgd;
1977         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1978         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1979         INIT_WORK(&ifmgd->beacon_connection_loss_work,
1980                   ieee80211_beacon_connection_loss_work);
1981         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
1982         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1983                     (unsigned long) sdata);
1984         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1985                     (unsigned long) sdata);
1986         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1987                     (unsigned long) sdata);
1988         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1989                     (unsigned long) sdata);
1990
1991         ifmgd->flags = 0;
1992
1993         mutex_init(&ifmgd->mtx);
1994
1995         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1996                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1997         else
1998                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1999 }
2000
2001 /* scan finished notification */
2002 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2003 {
2004         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2005
2006         /* Restart STA timers */
2007         rcu_read_lock();
2008         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2009                 ieee80211_restart_sta_timer(sdata);
2010         rcu_read_unlock();
2011 }
2012
2013 int ieee80211_max_network_latency(struct notifier_block *nb,
2014                                   unsigned long data, void *dummy)
2015 {
2016         s32 latency_usec = (s32) data;
2017         struct ieee80211_local *local =
2018                 container_of(nb, struct ieee80211_local,
2019                              network_latency_notifier);
2020
2021         mutex_lock(&local->iflist_mtx);
2022         ieee80211_recalc_ps(local, latency_usec);
2023         mutex_unlock(&local->iflist_mtx);
2024
2025         return 0;
2026 }
2027
2028 /* config hooks */
2029 static enum work_done_result
2030 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2031                           struct sk_buff *skb)
2032 {
2033         if (!skb) {
2034                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2035                 return WORK_DONE_DESTROY;
2036         }
2037
2038         if (wk->type == IEEE80211_WORK_AUTH) {
2039                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2040                 return WORK_DONE_DESTROY;
2041         }
2042
2043         mutex_lock(&wk->sdata->u.mgd.mtx);
2044         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2045         mutex_unlock(&wk->sdata->u.mgd.mtx);
2046
2047         wk->type = IEEE80211_WORK_AUTH;
2048         wk->probe_auth.tries = 0;
2049         return WORK_DONE_REQUEUE;
2050 }
2051
2052 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2053                        struct cfg80211_auth_request *req)
2054 {
2055         const u8 *ssid;
2056         struct ieee80211_work *wk;
2057         u16 auth_alg;
2058
2059         if (req->local_state_change)
2060                 return 0; /* no need to update mac80211 state */
2061
2062         switch (req->auth_type) {
2063         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2064                 auth_alg = WLAN_AUTH_OPEN;
2065                 break;
2066         case NL80211_AUTHTYPE_SHARED_KEY:
2067                 if (IS_ERR(sdata->local->wep_tx_tfm))
2068                         return -EOPNOTSUPP;
2069                 auth_alg = WLAN_AUTH_SHARED_KEY;
2070                 break;
2071         case NL80211_AUTHTYPE_FT:
2072                 auth_alg = WLAN_AUTH_FT;
2073                 break;
2074         case NL80211_AUTHTYPE_NETWORK_EAP:
2075                 auth_alg = WLAN_AUTH_LEAP;
2076                 break;
2077         default:
2078                 return -EOPNOTSUPP;
2079         }
2080
2081         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2082         if (!wk)
2083                 return -ENOMEM;
2084
2085         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2086
2087         if (req->ie && req->ie_len) {
2088                 memcpy(wk->ie, req->ie, req->ie_len);
2089                 wk->ie_len = req->ie_len;
2090         }
2091
2092         if (req->key && req->key_len) {
2093                 wk->probe_auth.key_len = req->key_len;
2094                 wk->probe_auth.key_idx = req->key_idx;
2095                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2096         }
2097
2098         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2099         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2100         wk->probe_auth.ssid_len = ssid[1];
2101
2102         wk->probe_auth.algorithm = auth_alg;
2103         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2104
2105         /* if we already have a probe, don't probe again */
2106         if (req->bss->proberesp_ies)
2107                 wk->type = IEEE80211_WORK_AUTH;
2108         else
2109                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2110         wk->chan = req->bss->channel;
2111         wk->sdata = sdata;
2112         wk->done = ieee80211_probe_auth_done;
2113
2114         ieee80211_add_work(wk);
2115         return 0;
2116 }
2117
2118 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2119                                                   struct sk_buff *skb)
2120 {
2121         struct ieee80211_mgmt *mgmt;
2122         struct ieee80211_rx_status *rx_status;
2123         struct ieee802_11_elems elems;
2124         u16 status;
2125
2126         if (!skb) {
2127                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2128                 return WORK_DONE_DESTROY;
2129         }
2130
2131         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2132                 mutex_lock(&wk->sdata->u.mgd.mtx);
2133                 rx_status = (void *) skb->cb;
2134                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2135                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2136                                       &elems, true);
2137                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2138
2139                 wk->type = IEEE80211_WORK_ASSOC;
2140                 /* not really done yet */
2141                 return WORK_DONE_REQUEUE;
2142         }
2143
2144         mgmt = (void *)skb->data;
2145         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2146
2147         if (status == WLAN_STATUS_SUCCESS) {
2148                 mutex_lock(&wk->sdata->u.mgd.mtx);
2149                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2150                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2151                         /* oops -- internal error -- send timeout for now */
2152                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2153                                                     wk->filter_ta);
2154                         return WORK_DONE_DESTROY;
2155                 }
2156
2157                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2158         }
2159
2160         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2161         return WORK_DONE_DESTROY;
2162 }
2163
2164 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2165                         struct cfg80211_assoc_request *req)
2166 {
2167         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2168         struct ieee80211_bss *bss = (void *)req->bss->priv;
2169         struct ieee80211_work *wk;
2170         const u8 *ssid;
2171         int i;
2172
2173         mutex_lock(&ifmgd->mtx);
2174         if (ifmgd->associated) {
2175                 if (!req->prev_bssid ||
2176                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2177                            ETH_ALEN)) {
2178                         /*
2179                          * We are already associated and the request was not a
2180                          * reassociation request from the current BSS, so
2181                          * reject it.
2182                          */
2183                         mutex_unlock(&ifmgd->mtx);
2184                         return -EALREADY;
2185                 }
2186
2187                 /* Trying to reassociate - clear previous association state */
2188                 ieee80211_set_disassoc(sdata, true);
2189         }
2190         mutex_unlock(&ifmgd->mtx);
2191
2192         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2193         if (!wk)
2194                 return -ENOMEM;
2195
2196         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2197         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2198
2199         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2200                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2201                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2202                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2203                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2204
2205
2206         if (req->ie && req->ie_len) {
2207                 memcpy(wk->ie, req->ie, req->ie_len);
2208                 wk->ie_len = req->ie_len;
2209         } else
2210                 wk->ie_len = 0;
2211
2212         wk->assoc.bss = req->bss;
2213
2214         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2215
2216         /* new association always uses requested smps mode */
2217         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2218                 if (ifmgd->powersave)
2219                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2220                 else
2221                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2222         } else
2223                 ifmgd->ap_smps = ifmgd->req_smps;
2224
2225         wk->assoc.smps = ifmgd->ap_smps;
2226         /*
2227          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2228          * We still associate in non-HT mode (11a/b/g) if any one of these
2229          * ciphers is configured as pairwise.
2230          * We can set this to true for non-11n hardware, that'll be checked
2231          * separately along with the peer capabilities.
2232          */
2233         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2234         wk->assoc.capability = req->bss->capability;
2235         wk->assoc.wmm_used = bss->wmm_used;
2236         wk->assoc.supp_rates = bss->supp_rates;
2237         wk->assoc.supp_rates_len = bss->supp_rates_len;
2238         wk->assoc.ht_information_ie =
2239                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2240
2241         if (bss->wmm_used && bss->uapsd_supported &&
2242             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2243                 wk->assoc.uapsd_used = true;
2244                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2245         } else {
2246                 wk->assoc.uapsd_used = false;
2247                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2248         }
2249
2250         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2251         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2252         wk->assoc.ssid_len = ssid[1];
2253
2254         if (req->prev_bssid)
2255                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2256
2257         wk->chan = req->bss->channel;
2258         wk->sdata = sdata;
2259         wk->done = ieee80211_assoc_done;
2260         if (!bss->dtim_period &&
2261             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2262                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2263         else
2264                 wk->type = IEEE80211_WORK_ASSOC;
2265
2266         if (req->use_mfp) {
2267                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2268                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2269         } else {
2270                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2271                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2272         }
2273
2274         if (req->crypto.control_port)
2275                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2276         else
2277                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2278
2279         sdata->control_port_protocol = req->crypto.control_port_ethertype;
2280         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2281
2282         ieee80211_add_work(wk);
2283         return 0;
2284 }
2285
2286 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2287                          struct cfg80211_deauth_request *req,
2288                          void *cookie)
2289 {
2290         struct ieee80211_local *local = sdata->local;
2291         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2292         struct ieee80211_work *wk;
2293         u8 bssid[ETH_ALEN];
2294         bool assoc_bss = false;
2295
2296         mutex_lock(&ifmgd->mtx);
2297
2298         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2299         if (ifmgd->associated == req->bss) {
2300                 ieee80211_set_disassoc(sdata, false);
2301                 mutex_unlock(&ifmgd->mtx);
2302                 assoc_bss = true;
2303         } else {
2304                 bool not_auth_yet = false;
2305
2306                 mutex_unlock(&ifmgd->mtx);
2307
2308                 mutex_lock(&local->mtx);
2309                 list_for_each_entry(wk, &local->work_list, list) {
2310                         if (wk->sdata != sdata)
2311                                 continue;
2312
2313                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2314                             wk->type != IEEE80211_WORK_AUTH &&
2315                             wk->type != IEEE80211_WORK_ASSOC &&
2316                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2317                                 continue;
2318
2319                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2320                                 continue;
2321
2322                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2323                         list_del_rcu(&wk->list);
2324                         free_work(wk);
2325                         break;
2326                 }
2327                 mutex_unlock(&local->mtx);
2328
2329                 /*
2330                  * If somebody requests authentication and we haven't
2331                  * sent out an auth frame yet there's no need to send
2332                  * out a deauth frame either. If the state was PROBE,
2333                  * then this is the case. If it's AUTH we have sent a
2334                  * frame, and if it's IDLE we have completed the auth
2335                  * process already.
2336                  */
2337                 if (not_auth_yet) {
2338                         __cfg80211_auth_canceled(sdata->dev, bssid);
2339                         return 0;
2340                 }
2341         }
2342
2343         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2344                sdata->name, bssid, req->reason_code);
2345
2346         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2347                                        req->reason_code, cookie,
2348                                        !req->local_state_change);
2349         if (assoc_bss)
2350                 sta_info_destroy_addr(sdata, bssid);
2351
2352         mutex_lock(&sdata->local->mtx);
2353         ieee80211_recalc_idle(sdata->local);
2354         mutex_unlock(&sdata->local->mtx);
2355
2356         return 0;
2357 }
2358
2359 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2360                            struct cfg80211_disassoc_request *req,
2361                            void *cookie)
2362 {
2363         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2364         u8 bssid[ETH_ALEN];
2365
2366         mutex_lock(&ifmgd->mtx);
2367
2368         /*
2369          * cfg80211 should catch this ... but it's racy since
2370          * we can receive a disassoc frame, process it, hand it
2371          * to cfg80211 while that's in a locked section already
2372          * trying to tell us that the user wants to disconnect.
2373          */
2374         if (ifmgd->associated != req->bss) {
2375                 mutex_unlock(&ifmgd->mtx);
2376                 return -ENOLINK;
2377         }
2378
2379         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2380                sdata->name, req->bss->bssid, req->reason_code);
2381
2382         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2383         ieee80211_set_disassoc(sdata, false);
2384
2385         mutex_unlock(&ifmgd->mtx);
2386
2387         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2388                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2389                         cookie, !req->local_state_change);
2390         sta_info_destroy_addr(sdata, bssid);
2391
2392         mutex_lock(&sdata->local->mtx);
2393         ieee80211_recalc_idle(sdata->local);
2394         mutex_unlock(&sdata->local->mtx);
2395
2396         return 0;
2397 }
2398
2399 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2400                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2401                                gfp_t gfp)
2402 {
2403         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2404
2405         trace_api_cqm_rssi_notify(sdata, rssi_event);
2406
2407         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2408 }
2409 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);