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         lockdep_assert_held(&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 void ieee80211_sta_reset_beacon_monitor(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 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 128 {
 129         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 130
 131         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 132                 return;
 133
 134         mod_timer(&sdata->u.mgd.conn_mon_timer,
 135                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 136
 137         ifmgd->probe_send_count = 0;
 138 }
 139
 140 static int ecw2cw(int ecw)
 141 {
 142         return (1 << ecw) - 1;
 143 }
 144
 145 /*
 146  * ieee80211_enable_ht should be called only after the operating band
 147  * has been determined as ht configuration depends on the hw's
 148  * HT abilities for a specific band.
 149  */
 150 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 151                                struct ieee80211_ht_info *hti,
 152                                const u8 *bssid, u16 ap_ht_cap_flags)
 153 {
 154         struct ieee80211_local *local = sdata->local;
 155         struct ieee80211_supported_band *sband;
 156         struct sta_info *sta;
 157         u32 changed = 0;
 158         u16 ht_opmode;
 159         bool enable_ht = true;
 160         enum nl80211_channel_type prev_chantype;
 161         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 162
 163         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 164
 165         prev_chantype = sdata->vif.bss_conf.channel_type;
 166
 167         /* HT is not supported */
 168         if (!sband->ht_cap.ht_supported)
 169                 enable_ht = false;
 170
 171         /* check that channel matches the right operating channel */
 172         if (local->hw.conf.channel->center_freq !=
 173             ieee80211_channel_to_frequency(hti->control_chan))
 174                 enable_ht = false;
 175
 176         if (enable_ht) {
 177                 channel_type = NL80211_CHAN_HT20;
 178
 179                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 180                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 181                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 182                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 183                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 184                                 if (!(local->hw.conf.channel->flags &
 185                                     IEEE80211_CHAN_NO_HT40PLUS))
 186                                         channel_type = NL80211_CHAN_HT40PLUS;
 187                                 break;
 188                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 189                                 if (!(local->hw.conf.channel->flags &
 190                                     IEEE80211_CHAN_NO_HT40MINUS))
 191                                         channel_type = NL80211_CHAN_HT40MINUS;
 192                                 break;
 193                         }
 194                 }
 195         }
 196
 197         if (local->tmp_channel)
 198                 local->tmp_channel_type = channel_type;
 199
 200         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 201                 /* can only fail due to HT40+/- mismatch */
 202                 channel_type = NL80211_CHAN_HT20;
 203                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 204         }
 205
 206         /* channel_type change automatically detected */
 207         ieee80211_hw_config(local, 0);
 208
 209         if (prev_chantype != channel_type) {
 210                 rcu_read_lock();
 211                 sta = sta_info_get(sdata, bssid);
 212                 if (sta)
 213                         rate_control_rate_update(local, sband, sta,
 214                                                  IEEE80211_RC_HT_CHANGED,
 215                                                  channel_type);
 216                 rcu_read_unlock();
 217         }
 218
 219         ht_opmode = le16_to_cpu(hti->operation_mode);
 220
 221         /* if bss configuration changed store the new one */
 222         if (sdata->ht_opmode_valid != enable_ht ||
 223             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 224             prev_chantype != channel_type) {
 225                 changed |= BSS_CHANGED_HT;
 226                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 227                 sdata->ht_opmode_valid = enable_ht;
 228         }
 229
 230         return changed;
 231 }
 232
 233 /* frame sending functions */
 234
 235 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 236                                            const u8 *bssid, u16 stype, u16 reason,
 237                                            void *cookie, bool send_frame)
 238 {
 239         struct ieee80211_local *local = sdata->local;
 240         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 241         struct sk_buff *skb;
 242         struct ieee80211_mgmt *mgmt;
 243
 244         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 245         if (!skb) {
 246                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 247                        "deauth/disassoc frame\n", sdata->name);
 248                 return;
 249         }
 250         skb_reserve(skb, local->hw.extra_tx_headroom);
 251
 252         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 253         memset(mgmt, 0, 24);
 254         memcpy(mgmt->da, bssid, ETH_ALEN);
 255         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 256         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 257         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 258         skb_put(skb, 2);
 259         /* u.deauth.reason_code == u.disassoc.reason_code */
 260         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 261
 262         if (stype == IEEE80211_STYPE_DEAUTH)
 263                 if (cookie)
 264                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 265                 else
 266                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 267         else
 268                 if (cookie)
 269                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 270                 else
 271                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 272         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 273                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 274
 275         if (send_frame)
 276                 ieee80211_tx_skb(sdata, skb);
 277         else
 278                 kfree_skb(skb);
 279 }
 280
 281 void ieee80211_send_pspoll(struct ieee80211_local *local,
 282                            struct ieee80211_sub_if_data *sdata)
 283 {
 284         struct ieee80211_pspoll *pspoll;
 285         struct sk_buff *skb;
 286
 287         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 288         if (!skb)
 289                 return;
 290
 291         pspoll = (struct ieee80211_pspoll *) skb->data;
 292         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 293
 294         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 295         ieee80211_tx_skb(sdata, skb);
 296 }
 297
 298 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 299                              struct ieee80211_sub_if_data *sdata,
 300                              int powersave)
 301 {
 302         struct sk_buff *skb;
 303         struct ieee80211_hdr_3addr *nullfunc;
 304
 305         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 306         if (!skb)
 307                 return;
 308
 309         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 310         if (powersave)
 311                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 312
 313         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 314         ieee80211_tx_skb(sdata, skb);
 315 }
 316
 317 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 318                                           struct ieee80211_sub_if_data *sdata)
 319 {
 320         struct sk_buff *skb;
 321         struct ieee80211_hdr *nullfunc;
 322         __le16 fc;
 323
 324         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 325                 return;
 326
 327         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 328         if (!skb) {
 329                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 330                        "nullfunc frame\n", sdata->name);
 331                 return;
 332         }
 333         skb_reserve(skb, local->hw.extra_tx_headroom);
 334
 335         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 336         memset(nullfunc, 0, 30);
 337         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 338                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 339         nullfunc->frame_control = fc;
 340         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 341         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 342         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 343         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 344
 345         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 346         ieee80211_tx_skb(sdata, skb);
 347 }
 348
 349 /* spectrum management related things */
 350 static void ieee80211_chswitch_work(struct work_struct *work)
 351 {
 352         struct ieee80211_sub_if_data *sdata =
 353                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 354         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 355
 356         if (!ieee80211_sdata_running(sdata))
 357                 return;
 358
 359         mutex_lock(&ifmgd->mtx);
 360         if (!ifmgd->associated)
 361                 goto out;
 362
 363         sdata->local->oper_channel = sdata->local->csa_channel;
 364         if (!sdata->local->ops->channel_switch) {
 365                 /* call "hw_config" only if doing sw channel switch */
 366                 ieee80211_hw_config(sdata->local,
 367                         IEEE80211_CONF_CHANGE_CHANNEL);
 368         }
 369
 370         /* XXX: shouldn't really modify cfg80211-owned data! */
 371         ifmgd->associated->channel = sdata->local->oper_channel;
 372
 373         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 374                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 375  out:
 376         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 377         mutex_unlock(&ifmgd->mtx);
 378 }
 379
 380 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 381 {
 382         struct ieee80211_sub_if_data *sdata;
 383         struct ieee80211_if_managed *ifmgd;
 384
 385         sdata = vif_to_sdata(vif);
 386         ifmgd = &sdata->u.mgd;
 387
 388         trace_api_chswitch_done(sdata, success);
 389         if (!success) {
 390                 /*
 391                  * If the channel switch was not successful, stay
 392                  * around on the old channel. We currently lack
 393                  * good handling of this situation, possibly we
 394                  * should just drop the association.
 395                  */
 396                 sdata->local->csa_channel = sdata->local->oper_channel;
 397         }
 398
 399         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 400 }
 401 EXPORT_SYMBOL(ieee80211_chswitch_done);
 402
 403 static void ieee80211_chswitch_timer(unsigned long data)
 404 {
 405         struct ieee80211_sub_if_data *sdata =
 406                 (struct ieee80211_sub_if_data *) data;
 407         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 408
 409         if (sdata->local->quiescing) {
 410                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 411                 return;
 412         }
 413
 414         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 415 }
 416
 417 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 418                                       struct ieee80211_channel_sw_ie *sw_elem,
 419                                       struct ieee80211_bss *bss,
 420                                       u64 timestamp)
 421 {
 422         struct cfg80211_bss *cbss =
 423                 container_of((void *)bss, struct cfg80211_bss, priv);
 424         struct ieee80211_channel *new_ch;
 425         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 426         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 427
 428         ASSERT_MGD_MTX(ifmgd);
 429
 430         if (!ifmgd->associated)
 431                 return;
 432
 433         if (sdata->local->scanning)
 434                 return;
 435
 436         /* Disregard subsequent beacons if we are already running a timer
 437            processing a CSA */
 438
 439         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 440                 return;
 441
 442         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 443         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 444                 return;
 445
 446         sdata->local->csa_channel = new_ch;
 447
 448         if (sdata->local->ops->channel_switch) {
 449                 /* use driver's channel switch callback */
 450                 struct ieee80211_channel_switch ch_switch;
 451                 memset(&ch_switch, 0, sizeof(ch_switch));
 452                 ch_switch.timestamp = timestamp;
 453                 if (sw_elem->mode) {
 454                         ch_switch.block_tx = true;
 455                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 456                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 457                 }
 458                 ch_switch.channel = new_ch;
 459                 ch_switch.count = sw_elem->count;
 460                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 461                 drv_channel_switch(sdata->local, &ch_switch);
 462                 return;
 463         }
 464
 465         /* channel switch handled in software */
 466         if (sw_elem->count <= 1) {
 467                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 468         } else {
 469                 if (sw_elem->mode)
 470                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 471                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 472                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 473                 mod_timer(&ifmgd->chswitch_timer,
 474                           jiffies +
 475                           msecs_to_jiffies(sw_elem->count *
 476                                            cbss->beacon_interval));
 477         }
 478 }
 479
 480 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 481                                         u16 capab_info, u8 *pwr_constr_elem,
 482                                         u8 pwr_constr_elem_len)
 483 {
 484         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 485
 486         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 487                 return;
 488
 489         /* Power constraint IE length should be 1 octet */
 490         if (pwr_constr_elem_len != 1)
 491                 return;
 492
 493         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 494             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 495                 sdata->local->power_constr_level = *pwr_constr_elem;
 496                 ieee80211_hw_config(sdata->local, 0);
 497         }
 498 }
 499
 500 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 501 {
 502         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 503         struct ieee80211_local *local = sdata->local;
 504         struct ieee80211_conf *conf = &local->hw.conf;
 505
 506         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 507                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 508                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 509
 510         local->disable_dynamic_ps = false;
 511         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 512 }
 513 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 514
 515 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 516 {
 517         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 518         struct ieee80211_local *local = sdata->local;
 519         struct ieee80211_conf *conf = &local->hw.conf;
 520
 521         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 522                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 523                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 524
 525         local->disable_dynamic_ps = true;
 526         conf->dynamic_ps_timeout = 0;
 527         del_timer_sync(&local->dynamic_ps_timer);
 528         ieee80211_queue_work(&local->hw,
 529                              &local->dynamic_ps_enable_work);
 530 }
 531 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 532
 533 /* powersave */
 534 static void ieee80211_enable_ps(struct ieee80211_local *local,
 535                                 struct ieee80211_sub_if_data *sdata)
 536 {
 537         struct ieee80211_conf *conf = &local->hw.conf;
 538
 539         /*
 540          * If we are scanning right now then the parameters will
 541          * take effect when scan finishes.
 542          */
 543         if (local->scanning)
 544                 return;
 545
 546         if (conf->dynamic_ps_timeout > 0 &&
 547             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 548                 mod_timer(&local->dynamic_ps_timer, jiffies +
 549                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 550         } else {
 551                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 552                         ieee80211_send_nullfunc(local, sdata, 1);
 553
 554                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 555                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 556                         return;
 557
 558                 conf->flags |= IEEE80211_CONF_PS;
 559                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 560         }
 561 }
 562
 563 static void ieee80211_change_ps(struct ieee80211_local *local)
 564 {
 565         struct ieee80211_conf *conf = &local->hw.conf;
 566
 567         if (local->ps_sdata) {
 568                 ieee80211_enable_ps(local, local->ps_sdata);
 569         } else if (conf->flags & IEEE80211_CONF_PS) {
 570                 conf->flags &= ~IEEE80211_CONF_PS;
 571                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 572                 del_timer_sync(&local->dynamic_ps_timer);
 573                 cancel_work_sync(&local->dynamic_ps_enable_work);
 574         }
 575 }
 576
 577 /* need to hold RTNL or interface lock */
 578 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 579 {
 580         struct ieee80211_sub_if_data *sdata, *found = NULL;
 581         int count = 0;
 582         int timeout;
 583
 584         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 585                 local->ps_sdata = NULL;
 586                 return;
 587         }
 588
 589         if (!list_empty(&local->work_list)) {
 590                 local->ps_sdata = NULL;
 591                 goto change;
 592         }
 593
 594         list_for_each_entry(sdata, &local->interfaces, list) {
 595                 if (!ieee80211_sdata_running(sdata))
 596                         continue;
 597                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 598                         continue;
 599                 found = sdata;
 600                 count++;
 601         }
 602
 603         if (count == 1 && found->u.mgd.powersave &&
 604             found->u.mgd.associated &&
 605             found->u.mgd.associated->beacon_ies &&
 606             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 607                                     IEEE80211_STA_CONNECTION_POLL))) {
 608                 struct ieee80211_conf *conf = &local->hw.conf;
 609                 s32 beaconint_us;
 610
 611                 if (latency < 0)
 612                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 613
 614                 beaconint_us = ieee80211_tu_to_usec(
 615                                         found->vif.bss_conf.beacon_int);
 616
 617                 timeout = local->dynamic_ps_forced_timeout;
 618                 if (timeout < 0) {
 619                         /*
 620                          * Go to full PSM if the user configures a very low
 621                          * latency requirement.
 622                          * The 2 second value is there for compatibility until
 623                          * the PM_QOS_NETWORK_LATENCY is configured with real
 624                          * values.
 625                          */
 626                         if (latency > 1900000000 && latency != 2000000000)
 627                                 timeout = 0;
 628                         else
 629                                 timeout = 100;
 630                 }
 631                 local->dynamic_ps_user_timeout = timeout;
 632                 if (!local->disable_dynamic_ps)
 633                         conf->dynamic_ps_timeout =
 634                                 local->dynamic_ps_user_timeout;
 635
 636                 if (beaconint_us > latency) {
 637                         local->ps_sdata = NULL;
 638                 } else {
 639                         struct ieee80211_bss *bss;
 640                         int maxslp = 1;
 641                         u8 dtimper;
 642
 643                         bss = (void *)found->u.mgd.associated->priv;
 644                         dtimper = bss->dtim_period;
 645
 646                         /* If the TIM IE is invalid, pretend the value is 1 */
 647                         if (!dtimper)
 648                                 dtimper = 1;
 649                         else if (dtimper > 1)
 650                                 maxslp = min_t(int, dtimper,
 651                                                     latency / beaconint_us);
 652
 653                         local->hw.conf.max_sleep_period = maxslp;
 654                         local->hw.conf.ps_dtim_period = dtimper;
 655                         local->ps_sdata = found;
 656                 }
 657         } else {
 658                 local->ps_sdata = NULL;
 659         }
 660
 661  change:
 662         ieee80211_change_ps(local);
 663 }
 664
 665 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 666 {
 667         struct ieee80211_local *local =
 668                 container_of(work, struct ieee80211_local,
 669                              dynamic_ps_disable_work);
 670
 671         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 672                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 673                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 674         }
 675
 676         ieee80211_wake_queues_by_reason(&local->hw,
 677                                         IEEE80211_QUEUE_STOP_REASON_PS);
 678 }
 679
 680 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 681 {
 682         struct ieee80211_local *local =
 683                 container_of(work, struct ieee80211_local,
 684                              dynamic_ps_enable_work);
 685         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 686         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 687
 688         /* can only happen when PS was just disabled anyway */
 689         if (!sdata)
 690                 return;
 691
 692         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 693                 return;
 694
 695         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 696             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 697                 ieee80211_send_nullfunc(local, sdata, 1);
 698
 699         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 700               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 701             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 702                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 703                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 704                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 705         }
 706 }
 707
 708 void ieee80211_dynamic_ps_timer(unsigned long data)
 709 {
 710         struct ieee80211_local *local = (void *) data;
 711
 712         if (local->quiescing || local->suspended)
 713                 return;
 714
 715         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 716 }
 717
 718 /* MLME */
 719 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 720                                      struct ieee80211_sub_if_data *sdata,
 721                                      u8 *wmm_param, size_t wmm_param_len)
 722 {
 723         struct ieee80211_tx_queue_params params;
 724         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 725         size_t left;
 726         int count;
 727         u8 *pos, uapsd_queues = 0;
 728
 729         if (!local->ops->conf_tx)
 730                 return;
 731
 732         if (local->hw.queues < 4)
 733                 return;
 734
 735         if (!wmm_param)
 736                 return;
 737
 738         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 739                 return;
 740
 741         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 742                 uapsd_queues = local->uapsd_queues;
 743
 744         count = wmm_param[6] & 0x0f;
 745         if (count == ifmgd->wmm_last_param_set)
 746                 return;
 747         ifmgd->wmm_last_param_set = count;
 748
 749         pos = wmm_param + 8;
 750         left = wmm_param_len - 8;
 751
 752         memset(&params, 0, sizeof(params));
 753
 754         local->wmm_acm = 0;
 755         for (; left >= 4; left -= 4, pos += 4) {
 756                 int aci = (pos[0] >> 5) & 0x03;
 757                 int acm = (pos[0] >> 4) & 0x01;
 758                 bool uapsd = false;
 759                 int queue;
 760
 761                 switch (aci) {
 762                 case 1: /* AC_BK */
 763                         queue = 3;
 764                         if (acm)
 765                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 766                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 767                                 uapsd = true;
 768                         break;
 769                 case 2: /* AC_VI */
 770                         queue = 1;
 771                         if (acm)
 772                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 773                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 774                                 uapsd = true;
 775                         break;
 776                 case 3: /* AC_VO */
 777                         queue = 0;
 778                         if (acm)
 779                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 780                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 781                                 uapsd = true;
 782                         break;
 783                 case 0: /* AC_BE */
 784                 default:
 785                         queue = 2;
 786                         if (acm)
 787                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 788                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 789                                 uapsd = true;
 790                         break;
 791                 }
 792
 793                 params.aifs = pos[0] & 0x0f;
 794                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 795                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 796                 params.txop = get_unaligned_le16(pos + 2);
 797                 params.uapsd = uapsd;
 798
 799 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 800                 wiphy_debug(local->hw.wiphy,
 801                             "WMM queue=%d aci=%d acm=%d aifs=%d "
 802                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 803                             queue, aci, acm,
 804                             params.aifs, params.cw_min, params.cw_max,
 805                             params.txop, params.uapsd);
 806 #endif
 807                 if (drv_conf_tx(local, queue, &params))
 808                         wiphy_debug(local->hw.wiphy,
 809                                     "failed to set TX queue parameters for queue %d\n",
 810                                     queue);
 811         }
 812
 813         /* enable WMM or activate new settings */
 814         sdata->vif.bss_conf.qos = true;
 815         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 816 }
 817
 818 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 819                                            u16 capab, bool erp_valid, u8 erp)
 820 {
 821         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 822         u32 changed = 0;
 823         bool use_protection;
 824         bool use_short_preamble;
 825         bool use_short_slot;
 826
 827         if (erp_valid) {
 828                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 829                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 830         } else {
 831                 use_protection = false;
 832                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 833         }
 834
 835         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 836         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 837                 use_short_slot = true;
 838
 839         if (use_protection != bss_conf->use_cts_prot) {
 840                 bss_conf->use_cts_prot = use_protection;
 841                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 842         }
 843
 844         if (use_short_preamble != bss_conf->use_short_preamble) {
 845                 bss_conf->use_short_preamble = use_short_preamble;
 846                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 847         }
 848
 849         if (use_short_slot != bss_conf->use_short_slot) {
 850                 bss_conf->use_short_slot = use_short_slot;
 851                 changed |= BSS_CHANGED_ERP_SLOT;
 852         }
 853
 854         return changed;
 855 }
 856
 857 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 858                                      struct cfg80211_bss *cbss,
 859                                      u32 bss_info_changed)
 860 {
 861         struct ieee80211_bss *bss = (void *)cbss->priv;
 862         struct ieee80211_local *local = sdata->local;
 863         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 864
 865         bss_info_changed |= BSS_CHANGED_ASSOC;
 866         /* set timing information */
 867         bss_conf->beacon_int = cbss->beacon_interval;
 868         bss_conf->timestamp = cbss->tsf;
 869
 870         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 871         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 872                 cbss->capability, bss->has_erp_value, bss->erp_value);
 873
 874         sdata->u.mgd.associated = cbss;
 875         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 876
 877         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 878
 879         /* just to be sure */
 880         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 881                                 IEEE80211_STA_BEACON_POLL);
 882
 883         ieee80211_led_assoc(local, 1);
 884
 885         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
 886                 bss_conf->dtim_period = bss->dtim_period;
 887         else
 888                 bss_conf->dtim_period = 0;
 889
 890         bss_conf->assoc = 1;
 891         /*
 892          * For now just always ask the driver to update the basic rateset
 893          * when we have associated, we aren't checking whether it actually
 894          * changed or not.
 895          */
 896         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 897
 898         /* And the BSSID changed - we're associated now */
 899         bss_info_changed |= BSS_CHANGED_BSSID;
 900
 901         /* Tell the driver to monitor connection quality (if supported) */
 902         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 903             bss_conf->cqm_rssi_thold)
 904                 bss_info_changed |= BSS_CHANGED_CQM;
 905
 906         /* Enable ARP filtering */
 907         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
 908                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 909                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
 910         }
 911
 912         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 913
 914         mutex_lock(&local->iflist_mtx);
 915         ieee80211_recalc_ps(local, -1);
 916         ieee80211_recalc_smps(local);
 917         mutex_unlock(&local->iflist_mtx);
 918
 919         netif_tx_start_all_queues(sdata->dev);
 920         netif_carrier_on(sdata->dev);
 921 }
 922
 923 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 924                                    bool remove_sta, bool tx)
 925 {
 926         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 927         struct ieee80211_local *local = sdata->local;
 928         struct sta_info *sta;
 929         u32 changed = 0, config_changed = 0;
 930         u8 bssid[ETH_ALEN];
 931
 932         ASSERT_MGD_MTX(ifmgd);
 933
 934         if (WARN_ON(!ifmgd->associated))
 935                 return;
 936
 937         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 938
 939         ifmgd->associated = NULL;
 940         memset(ifmgd->bssid, 0, ETH_ALEN);
 941
 942         /*
 943          * we need to commit the associated = NULL change because the
 944          * scan code uses that to determine whether this iface should
 945          * go to/wake up from powersave or not -- and could otherwise
 946          * wake the queues erroneously.
 947          */
 948         smp_mb();
 949
 950         /*
 951          * Thus, we can only afterwards stop the queues -- to account
 952          * for the case where another CPU is finishing a scan at this
 953          * time -- we don't want the scan code to enable queues.
 954          */
 955
 956         netif_tx_stop_all_queues(sdata->dev);
 957         netif_carrier_off(sdata->dev);
 958
 959         mutex_lock(&local->sta_mtx);
 960         sta = sta_info_get(sdata, bssid);
 961         if (sta) {
 962                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
 963                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
 964         }
 965         mutex_unlock(&local->sta_mtx);
 966
 967         changed |= ieee80211_reset_erp_info(sdata);
 968
 969         ieee80211_led_assoc(local, 0);
 970         changed |= BSS_CHANGED_ASSOC;
 971         sdata->vif.bss_conf.assoc = false;
 972
 973         ieee80211_set_wmm_default(sdata);
 974
 975         /* channel(_type) changes are handled by ieee80211_hw_config */
 976         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
 977
 978         /* on the next assoc, re-program HT parameters */
 979         sdata->ht_opmode_valid = false;
 980
 981         local->power_constr_level = 0;
 982
 983         del_timer_sync(&local->dynamic_ps_timer);
 984         cancel_work_sync(&local->dynamic_ps_enable_work);
 985
 986         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 987                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 988                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 989         }
 990
 991         ieee80211_hw_config(local, config_changed);
 992
 993         /* Disable ARP filtering */
 994         if (sdata->vif.bss_conf.arp_filter_enabled) {
 995                 sdata->vif.bss_conf.arp_filter_enabled = false;
 996                 changed |= BSS_CHANGED_ARP_FILTER;
 997         }
 998
 999         /* The BSSID (not really interesting) and HT changed */
1000         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1001         ieee80211_bss_info_change_notify(sdata, changed);
1002
1003         if (remove_sta)
1004                 sta_info_destroy_addr(sdata, bssid);
1005
1006         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1007         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1008         del_timer_sync(&sdata->u.mgd.timer);
1009         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1010 }
1011
1012 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1013                              struct ieee80211_hdr *hdr)
1014 {
1015         /*
1016          * We can postpone the mgd.timer whenever receiving unicast frames
1017          * from AP because we know that the connection is working both ways
1018          * at that time. But multicast frames (and hence also beacons) must
1019          * be ignored here, because we need to trigger the timer during
1020          * data idle periods for sending the periodic probe request to the
1021          * AP we're connected to.
1022          */
1023         if (is_multicast_ether_addr(hdr->addr1))
1024                 return;
1025
1026         ieee80211_sta_reset_conn_monitor(sdata);
1027 }
1028
1029 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1030 {
1031         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1032         const u8 *ssid;
1033         u8 *dst = ifmgd->associated->bssid;
1034         u8 unicast_limit = max(1, IEEE80211_MAX_PROBE_TRIES - 3);
1035
1036         /*
1037          * Try sending broadcast probe requests for the last three
1038          * probe requests after the first ones failed since some
1039          * buggy APs only support broadcast probe requests.
1040          */
1041         if (ifmgd->probe_send_count >= unicast_limit)
1042                 dst = NULL;
1043
1044         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1045         ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0);
1046
1047         ifmgd->probe_send_count++;
1048         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1049         run_again(ifmgd, ifmgd->probe_timeout);
1050 }
1051
1052 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1053                                    bool beacon)
1054 {
1055         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1056         bool already = false;
1057
1058         if (!ieee80211_sdata_running(sdata))
1059                 return;
1060
1061         if (sdata->local->scanning)
1062                 return;
1063
1064         if (sdata->local->tmp_channel)
1065                 return;
1066
1067         mutex_lock(&ifmgd->mtx);
1068
1069         if (!ifmgd->associated)
1070                 goto out;
1071
1072 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1073         if (beacon && net_ratelimit())
1074                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1075                        "- sending probe request\n", sdata->name);
1076 #endif
1077
1078         /*
1079          * The driver/our work has already reported this event or the
1080          * connection monitoring has kicked in and we have already sent
1081          * a probe request. Or maybe the AP died and the driver keeps
1082          * reporting until we disassociate...
1083          *
1084          * In either case we have to ignore the current call to this
1085          * function (except for setting the correct probe reason bit)
1086          * because otherwise we would reset the timer every time and
1087          * never check whether we received a probe response!
1088          */
1089         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1090                             IEEE80211_STA_CONNECTION_POLL))
1091                 already = true;
1092
1093         if (beacon)
1094                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1095         else
1096                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1097
1098         if (already)
1099                 goto out;
1100
1101         mutex_lock(&sdata->local->iflist_mtx);
1102         ieee80211_recalc_ps(sdata->local, -1);
1103         mutex_unlock(&sdata->local->iflist_mtx);
1104
1105         ifmgd->probe_send_count = 0;
1106         ieee80211_mgd_probe_ap_send(sdata);
1107  out:
1108         mutex_unlock(&ifmgd->mtx);
1109 }
1110
1111 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1112 {
1113         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1114         struct ieee80211_local *local = sdata->local;
1115         u8 bssid[ETH_ALEN];
1116
1117         mutex_lock(&ifmgd->mtx);
1118         if (!ifmgd->associated) {
1119                 mutex_unlock(&ifmgd->mtx);
1120                 return;
1121         }
1122
1123         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1124
1125         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1126
1127         ieee80211_set_disassoc(sdata, true, true);
1128         mutex_unlock(&ifmgd->mtx);
1129
1130         mutex_lock(&local->mtx);
1131         ieee80211_recalc_idle(local);
1132         mutex_unlock(&local->mtx);
1133         /*
1134          * must be outside lock due to cfg80211,
1135          * but that's not a problem.
1136          */
1137         ieee80211_send_deauth_disassoc(sdata, bssid,
1138                                        IEEE80211_STYPE_DEAUTH,
1139                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1140                                        NULL, true);
1141 }
1142
1143 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1144 {
1145         struct ieee80211_sub_if_data *sdata =
1146                 container_of(work, struct ieee80211_sub_if_data,
1147                              u.mgd.beacon_connection_loss_work);
1148
1149         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1150                 __ieee80211_connection_loss(sdata);
1151         else
1152                 ieee80211_mgd_probe_ap(sdata, true);
1153 }
1154
1155 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1156 {
1157         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1158         struct ieee80211_hw *hw = &sdata->local->hw;
1159
1160         trace_api_beacon_loss(sdata);
1161
1162         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1163         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1164 }
1165 EXPORT_SYMBOL(ieee80211_beacon_loss);
1166
1167 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1168 {
1169         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1170         struct ieee80211_hw *hw = &sdata->local->hw;
1171
1172         trace_api_connection_loss(sdata);
1173
1174         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1175         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1176 }
1177 EXPORT_SYMBOL(ieee80211_connection_loss);
1178
1179
1180 static enum rx_mgmt_action __must_check
1181 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1182                          struct ieee80211_mgmt *mgmt, size_t len)
1183 {
1184         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1185         const u8 *bssid = NULL;
1186         u16 reason_code;
1187
1188         if (len < 24 + 2)
1189                 return RX_MGMT_NONE;
1190
1191         ASSERT_MGD_MTX(ifmgd);
1192
1193         bssid = ifmgd->associated->bssid;
1194
1195         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1196
1197         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1198                         sdata->name, bssid, reason_code);
1199
1200         ieee80211_set_disassoc(sdata, true, false);
1201         mutex_lock(&sdata->local->mtx);
1202         ieee80211_recalc_idle(sdata->local);
1203         mutex_unlock(&sdata->local->mtx);
1204
1205         return RX_MGMT_CFG80211_DEAUTH;
1206 }
1207
1208
1209 static enum rx_mgmt_action __must_check
1210 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1211                            struct ieee80211_mgmt *mgmt, size_t len)
1212 {
1213         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1214         u16 reason_code;
1215
1216         if (len < 24 + 2)
1217                 return RX_MGMT_NONE;
1218
1219         ASSERT_MGD_MTX(ifmgd);
1220
1221         if (WARN_ON(!ifmgd->associated))
1222                 return RX_MGMT_NONE;
1223
1224         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1225                 return RX_MGMT_NONE;
1226
1227         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1228
1229         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1230                         sdata->name, mgmt->sa, reason_code);
1231
1232         ieee80211_set_disassoc(sdata, true, false);
1233         mutex_lock(&sdata->local->mtx);
1234         ieee80211_recalc_idle(sdata->local);
1235         mutex_unlock(&sdata->local->mtx);
1236         return RX_MGMT_CFG80211_DISASSOC;
1237 }
1238
1239
1240 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1241                                     struct ieee80211_mgmt *mgmt, size_t len)
1242 {
1243         struct ieee80211_sub_if_data *sdata = wk->sdata;
1244         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1245         struct ieee80211_local *local = sdata->local;
1246         struct ieee80211_supported_band *sband;
1247         struct sta_info *sta;
1248         struct cfg80211_bss *cbss = wk->assoc.bss;
1249         u8 *pos;
1250         u32 rates, basic_rates;
1251         u16 capab_info, aid;
1252         struct ieee802_11_elems elems;
1253         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1254         u32 changed = 0;
1255         int i, j, err;
1256         bool have_higher_than_11mbit = false;
1257         u16 ap_ht_cap_flags;
1258
1259         /* AssocResp and ReassocResp have identical structure */
1260
1261         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1262         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1263
1264         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1265                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1266                        "set\n", sdata->name, aid);
1267         aid &= ~(BIT(15) | BIT(14));
1268
1269         pos = mgmt->u.assoc_resp.variable;
1270         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1271
1272         if (!elems.supp_rates) {
1273                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1274                        sdata->name);
1275                 return false;
1276         }
1277
1278         ifmgd->aid = aid;
1279
1280         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1281         if (!sta) {
1282                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1283                        " the AP\n", sdata->name);
1284                 return false;
1285         }
1286
1287         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1288                            WLAN_STA_ASSOC_AP);
1289         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1290                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1291
1292         rates = 0;
1293         basic_rates = 0;
1294         sband = local->hw.wiphy->bands[wk->chan->band];
1295
1296         for (i = 0; i < elems.supp_rates_len; i++) {
1297                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1298                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1299
1300                 if (rate > 110)
1301                         have_higher_than_11mbit = true;
1302
1303                 for (j = 0; j < sband->n_bitrates; j++) {
1304                         if (sband->bitrates[j].bitrate == rate) {
1305                                 rates |= BIT(j);
1306                                 if (is_basic)
1307                                         basic_rates |= BIT(j);
1308                                 break;
1309                         }
1310                 }
1311         }
1312
1313         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1314                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1315                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1316
1317                 if (rate > 110)
1318                         have_higher_than_11mbit = true;
1319
1320                 for (j = 0; j < sband->n_bitrates; j++) {
1321                         if (sband->bitrates[j].bitrate == rate) {
1322                                 rates |= BIT(j);
1323                                 if (is_basic)
1324                                         basic_rates |= BIT(j);
1325                                 break;
1326                         }
1327                 }
1328         }
1329
1330         sta->sta.supp_rates[wk->chan->band] = rates;
1331         sdata->vif.bss_conf.basic_rates = basic_rates;
1332
1333         /* cf. IEEE 802.11 9.2.12 */
1334         if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1335             have_higher_than_11mbit)
1336                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1337         else
1338                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1339
1340         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1341                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1342                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1343
1344         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1345
1346         rate_control_rate_init(sta);
1347
1348         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1349                 set_sta_flags(sta, WLAN_STA_MFP);
1350
1351         if (elems.wmm_param)
1352                 set_sta_flags(sta, WLAN_STA_WME);
1353
1354         err = sta_info_insert(sta);
1355         sta = NULL;
1356         if (err) {
1357                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1358                        " the AP (error %d)\n", sdata->name, err);
1359                 return false;
1360         }
1361
1362         /*
1363          * Always handle WMM once after association regardless
1364          * of the first value the AP uses. Setting -1 here has
1365          * that effect because the AP values is an unsigned
1366          * 4-bit value.
1367          */
1368         ifmgd->wmm_last_param_set = -1;
1369
1370         if (elems.wmm_param)
1371                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1372                                          elems.wmm_param_len);
1373         else
1374                 ieee80211_set_wmm_default(sdata);
1375
1376         local->oper_channel = wk->chan;
1377
1378         if (elems.ht_info_elem && elems.wmm_param &&
1379             (sdata->local->hw.queues >= 4) &&
1380             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1381                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1382                                                cbss->bssid, ap_ht_cap_flags);
1383
1384         /* set AID and assoc capability,
1385          * ieee80211_set_associated() will tell the driver */
1386         bss_conf->aid = aid;
1387         bss_conf->assoc_capability = capab_info;
1388         ieee80211_set_associated(sdata, cbss, changed);
1389
1390         /*
1391          * If we're using 4-addr mode, let the AP know that we're
1392          * doing so, so that it can create the STA VLAN on its side
1393          */
1394         if (ifmgd->use_4addr)
1395                 ieee80211_send_4addr_nullfunc(local, sdata);
1396
1397         /*
1398          * Start timer to probe the connection to the AP now.
1399          * Also start the timer that will detect beacon loss.
1400          */
1401         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1402         ieee80211_sta_reset_beacon_monitor(sdata);
1403
1404         return true;
1405 }
1406
1407
1408 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1409                                   struct ieee80211_mgmt *mgmt,
1410                                   size_t len,
1411                                   struct ieee80211_rx_status *rx_status,
1412                                   struct ieee802_11_elems *elems,
1413                                   bool beacon)
1414 {
1415         struct ieee80211_local *local = sdata->local;
1416         int freq;
1417         struct ieee80211_bss *bss;
1418         struct ieee80211_channel *channel;
1419         bool need_ps = false;
1420
1421         if (sdata->u.mgd.associated) {
1422                 bss = (void *)sdata->u.mgd.associated->priv;
1423                 /* not previously set so we may need to recalc */
1424                 need_ps = !bss->dtim_period;
1425         }
1426
1427         if (elems->ds_params && elems->ds_params_len == 1)
1428                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1429         else
1430                 freq = rx_status->freq;
1431
1432         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1433
1434         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1435                 return;
1436
1437         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1438                                         channel, beacon);
1439         if (bss)
1440                 ieee80211_rx_bss_put(local, bss);
1441
1442         if (!sdata->u.mgd.associated)
1443                 return;
1444
1445         if (need_ps) {
1446                 mutex_lock(&local->iflist_mtx);
1447                 ieee80211_recalc_ps(local, -1);
1448                 mutex_unlock(&local->iflist_mtx);
1449         }
1450
1451         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1452             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1453                                                         ETH_ALEN) == 0)) {
1454                 struct ieee80211_channel_sw_ie *sw_elem =
1455                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1456                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1457                                                  bss, rx_status->mactime);
1458         }
1459 }
1460
1461
1462 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1463                                          struct sk_buff *skb)
1464 {
1465         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1466         struct ieee80211_if_managed *ifmgd;
1467         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1468         size_t baselen, len = skb->len;
1469         struct ieee802_11_elems elems;
1470
1471         ifmgd = &sdata->u.mgd;
1472
1473         ASSERT_MGD_MTX(ifmgd);
1474
1475         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1476                 return; /* ignore ProbeResp to foreign address */
1477
1478         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1479         if (baselen > len)
1480                 return;
1481
1482         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1483                                 &elems);
1484
1485         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1486
1487         if (ifmgd->associated &&
1488             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1489             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1490                             IEEE80211_STA_CONNECTION_POLL)) {
1491                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1492                                   IEEE80211_STA_BEACON_POLL);
1493                 mutex_lock(&sdata->local->iflist_mtx);
1494                 ieee80211_recalc_ps(sdata->local, -1);
1495                 mutex_unlock(&sdata->local->iflist_mtx);
1496
1497                 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1498                         return;
1499
1500                 /*
1501                  * We've received a probe response, but are not sure whether
1502                  * we have or will be receiving any beacons or data, so let's
1503                  * schedule the timers again, just in case.
1504                  */
1505                 ieee80211_sta_reset_beacon_monitor(sdata);
1506
1507                 mod_timer(&ifmgd->conn_mon_timer,
1508                           round_jiffies_up(jiffies +
1509                                            IEEE80211_CONNECTION_IDLE_TIME));
1510         }
1511 }
1512
1513 /*
1514  * This is the canonical list of information elements we care about,
1515  * the filter code also gives us all changes to the Microsoft OUI
1516  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1517  *
1518  * We implement beacon filtering in software since that means we can
1519  * avoid processing the frame here and in cfg80211, and userspace
1520  * will not be able to tell whether the hardware supports it or not.
1521  *
1522  * XXX: This list needs to be dynamic -- userspace needs to be able to
1523  *      add items it requires. It also needs to be able to tell us to
1524  *      look out for other vendor IEs.
1525  */
1526 static const u64 care_about_ies =
1527         (1ULL << WLAN_EID_COUNTRY) |
1528         (1ULL << WLAN_EID_ERP_INFO) |
1529         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1530         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1531         (1ULL << WLAN_EID_HT_CAPABILITY) |
1532         (1ULL << WLAN_EID_HT_INFORMATION);
1533
1534 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1535                                      struct ieee80211_mgmt *mgmt,
1536                                      size_t len,
1537                                      struct ieee80211_rx_status *rx_status)
1538 {
1539         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1540         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1541         size_t baselen;
1542         struct ieee802_11_elems elems;
1543         struct ieee80211_local *local = sdata->local;
1544         u32 changed = 0;
1545         bool erp_valid, directed_tim = false;
1546         u8 erp_value = 0;
1547         u32 ncrc;
1548         u8 *bssid;
1549
1550         ASSERT_MGD_MTX(ifmgd);
1551
1552         /* Process beacon from the current BSS */
1553         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1554         if (baselen > len)
1555                 return;
1556
1557         if (rx_status->freq != local->hw.conf.channel->center_freq)
1558                 return;
1559
1560         /*
1561          * We might have received a number of frames, among them a
1562          * disassoc frame and a beacon...
1563          */
1564         if (!ifmgd->associated)
1565                 return;
1566
1567         bssid = ifmgd->associated->bssid;
1568
1569         /*
1570          * And in theory even frames from a different AP we were just
1571          * associated to a split-second ago!
1572          */
1573         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1574                 return;
1575
1576         /* Track average RSSI from the Beacon frames of the current AP */
1577         ifmgd->last_beacon_signal = rx_status->signal;
1578         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1579                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1580                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1581                 ifmgd->last_cqm_event_signal = 0;
1582                 ifmgd->count_beacon_signal = 1;
1583         } else {
1584                 ifmgd->ave_beacon_signal =
1585                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1586                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1587                          ifmgd->ave_beacon_signal) / 16;
1588                 ifmgd->count_beacon_signal++;
1589         }
1590         if (bss_conf->cqm_rssi_thold &&
1591             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1592             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1593                 int sig = ifmgd->ave_beacon_signal / 16;
1594                 int last_event = ifmgd->last_cqm_event_signal;
1595                 int thold = bss_conf->cqm_rssi_thold;
1596                 int hyst = bss_conf->cqm_rssi_hyst;
1597                 if (sig < thold &&
1598                     (last_event == 0 || sig < last_event - hyst)) {
1599                         ifmgd->last_cqm_event_signal = sig;
1600                         ieee80211_cqm_rssi_notify(
1601                                 &sdata->vif,
1602                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1603                                 GFP_KERNEL);
1604                 } else if (sig > thold &&
1605                            (last_event == 0 || sig > last_event + hyst)) {
1606                         ifmgd->last_cqm_event_signal = sig;
1607                         ieee80211_cqm_rssi_notify(
1608                                 &sdata->vif,
1609                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1610                                 GFP_KERNEL);
1611                 }
1612         }
1613
1614         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1615 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1616                 if (net_ratelimit()) {
1617                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1618                                "to a received beacon\n", sdata->name);
1619                 }
1620 #endif
1621                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1622                 mutex_lock(&local->iflist_mtx);
1623                 ieee80211_recalc_ps(local, -1);
1624                 mutex_unlock(&local->iflist_mtx);
1625         }
1626
1627         /*
1628          * Push the beacon loss detection into the future since
1629          * we are processing a beacon from the AP just now.
1630          */
1631         ieee80211_sta_reset_beacon_monitor(sdata);
1632
1633         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1634         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1635                                           len - baselen, &elems,
1636                                           care_about_ies, ncrc);
1637
1638         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1639                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1640                                                    ifmgd->aid);
1641
1642         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1643                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1644                                       true);
1645
1646                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1647                                          elems.wmm_param_len);
1648         }
1649
1650         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1651                 if (directed_tim) {
1652                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1653                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1654                                 ieee80211_hw_config(local,
1655                                                     IEEE80211_CONF_CHANGE_PS);
1656                                 ieee80211_send_nullfunc(local, sdata, 0);
1657                         } else {
1658                                 local->pspolling = true;
1659
1660                                 /*
1661                                  * Here is assumed that the driver will be
1662                                  * able to send ps-poll frame and receive a
1663                                  * response even though power save mode is
1664                                  * enabled, but some drivers might require
1665                                  * to disable power save here. This needs
1666                                  * to be investigated.
1667                                  */
1668                                 ieee80211_send_pspoll(local, sdata);
1669                         }
1670                 }
1671         }
1672
1673         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1674                 return;
1675         ifmgd->beacon_crc = ncrc;
1676         ifmgd->beacon_crc_valid = true;
1677
1678         if (elems.erp_info && elems.erp_info_len >= 1) {
1679                 erp_valid = true;
1680                 erp_value = elems.erp_info[0];
1681         } else {
1682                 erp_valid = false;
1683         }
1684         changed |= ieee80211_handle_bss_capability(sdata,
1685                         le16_to_cpu(mgmt->u.beacon.capab_info),
1686                         erp_valid, erp_value);
1687
1688
1689         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1690             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1691                 struct sta_info *sta;
1692                 struct ieee80211_supported_band *sband;
1693                 u16 ap_ht_cap_flags;
1694
1695                 rcu_read_lock();
1696
1697                 sta = sta_info_get(sdata, bssid);
1698                 if (WARN_ON(!sta)) {
1699                         rcu_read_unlock();
1700                         return;
1701                 }
1702
1703                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1704
1705                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1706                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1707
1708                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1709
1710                 rcu_read_unlock();
1711
1712                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1713                                                bssid, ap_ht_cap_flags);
1714         }
1715
1716         /* Note: country IE parsing is done for us by cfg80211 */
1717         if (elems.country_elem) {
1718                 /* TODO: IBSS also needs this */
1719                 if (elems.pwr_constr_elem)
1720                         ieee80211_handle_pwr_constr(sdata,
1721                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1722                                 elems.pwr_constr_elem,
1723                                 elems.pwr_constr_elem_len);
1724         }
1725
1726         ieee80211_bss_info_change_notify(sdata, changed);
1727 }
1728
1729 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1730                                   struct sk_buff *skb)
1731 {
1732         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1733         struct ieee80211_rx_status *rx_status;
1734         struct ieee80211_mgmt *mgmt;
1735         enum rx_mgmt_action rma = RX_MGMT_NONE;
1736         u16 fc;
1737
1738         rx_status = (struct ieee80211_rx_status *) skb->cb;
1739         mgmt = (struct ieee80211_mgmt *) skb->data;
1740         fc = le16_to_cpu(mgmt->frame_control);
1741
1742         mutex_lock(&ifmgd->mtx);
1743
1744         if (ifmgd->associated &&
1745             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1746                 switch (fc & IEEE80211_FCTL_STYPE) {
1747                 case IEEE80211_STYPE_BEACON:
1748                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1749                                                  rx_status);
1750                         break;
1751                 case IEEE80211_STYPE_PROBE_RESP:
1752                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1753                         break;
1754                 case IEEE80211_STYPE_DEAUTH:
1755                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1756                         break;
1757                 case IEEE80211_STYPE_DISASSOC:
1758                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1759                         break;
1760                 case IEEE80211_STYPE_ACTION:
1761                         switch (mgmt->u.action.category) {
1762                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1763                                 ieee80211_sta_process_chanswitch(sdata,
1764                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1765                                                 (void *)ifmgd->associated->priv,
1766                                                 rx_status->mactime);
1767                                 break;
1768                         }
1769                 }
1770                 mutex_unlock(&ifmgd->mtx);
1771
1772                 switch (rma) {
1773                 case RX_MGMT_NONE:
1774                         /* no action */
1775                         break;
1776                 case RX_MGMT_CFG80211_DEAUTH:
1777                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1778                         break;
1779                 case RX_MGMT_CFG80211_DISASSOC:
1780                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1781                         break;
1782                 default:
1783                         WARN(1, "unexpected: %d", rma);
1784                 }
1785                 return;
1786         }
1787
1788         mutex_unlock(&ifmgd->mtx);
1789
1790         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1791             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1792                 struct ieee80211_local *local = sdata->local;
1793                 struct ieee80211_work *wk;
1794
1795                 mutex_lock(&local->mtx);
1796                 list_for_each_entry(wk, &local->work_list, list) {
1797                         if (wk->sdata != sdata)
1798                                 continue;
1799
1800                         if (wk->type != IEEE80211_WORK_ASSOC &&
1801                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1802                                 continue;
1803
1804                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1805                                 continue;
1806                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1807                                 continue;
1808
1809                         /*
1810                          * Printing the message only here means we can't
1811                          * spuriously print it, but it also means that it
1812                          * won't be printed when the frame comes in before
1813                          * we even tried to associate or in similar cases.
1814                          *
1815                          * Ultimately, I suspect cfg80211 should print the
1816                          * messages instead.
1817                          */
1818                         printk(KERN_DEBUG
1819                                "%s: deauthenticated from %pM (Reason: %u)\n",
1820                                sdata->name, mgmt->bssid,
1821                                le16_to_cpu(mgmt->u.deauth.reason_code));
1822
1823                         list_del_rcu(&wk->list);
1824                         free_work(wk);
1825                         break;
1826                 }
1827                 mutex_unlock(&local->mtx);
1828
1829                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1830         }
1831 }
1832
1833 static void ieee80211_sta_timer(unsigned long data)
1834 {
1835         struct ieee80211_sub_if_data *sdata =
1836                 (struct ieee80211_sub_if_data *) data;
1837         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1838         struct ieee80211_local *local = sdata->local;
1839
1840         if (local->quiescing) {
1841                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1842                 return;
1843         }
1844
1845         ieee80211_queue_work(&local->hw, &sdata->work);
1846 }
1847
1848 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
1849 {
1850         struct ieee80211_local *local = sdata->local;
1851         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1852
1853         /* then process the rest of the work */
1854         mutex_lock(&ifmgd->mtx);
1855
1856         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1857                             IEEE80211_STA_CONNECTION_POLL) &&
1858             ifmgd->associated) {
1859                 u8 bssid[ETH_ALEN];
1860
1861                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1862                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1863                         run_again(ifmgd, ifmgd->probe_timeout);
1864
1865                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1866 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1867                         wiphy_debug(local->hw.wiphy,
1868                                     "%s: No probe response from AP %pM"
1869                                     " after %dms, try %d\n",
1870                                     sdata->name,
1871                                     bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ,
1872                                     ifmgd->probe_send_count);
1873 #endif
1874                         ieee80211_mgd_probe_ap_send(sdata);
1875                 } else {
1876                         /*
1877                          * We actually lost the connection ... or did we?
1878                          * Let's make sure!
1879                          */
1880                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1881                                           IEEE80211_STA_BEACON_POLL);
1882                         wiphy_debug(local->hw.wiphy,
1883                                     "%s: No probe response from AP %pM"
1884                                     " after %dms, disconnecting.\n",
1885                                     sdata->name,
1886                                     bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1887                         ieee80211_set_disassoc(sdata, true, true);
1888                         mutex_unlock(&ifmgd->mtx);
1889                         mutex_lock(&local->mtx);
1890                         ieee80211_recalc_idle(local);
1891                         mutex_unlock(&local->mtx);
1892                         /*
1893                          * must be outside lock due to cfg80211,
1894                          * but that's not a problem.
1895                          */
1896                         ieee80211_send_deauth_disassoc(sdata, bssid,
1897                                         IEEE80211_STYPE_DEAUTH,
1898                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1899                                         NULL, true);
1900                         mutex_lock(&ifmgd->mtx);
1901                 }
1902         }
1903
1904         mutex_unlock(&ifmgd->mtx);
1905 }
1906
1907 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1908 {
1909         struct ieee80211_sub_if_data *sdata =
1910                 (struct ieee80211_sub_if_data *) data;
1911         struct ieee80211_local *local = sdata->local;
1912
1913         if (local->quiescing)
1914                 return;
1915
1916         ieee80211_queue_work(&sdata->local->hw,
1917                              &sdata->u.mgd.beacon_connection_loss_work);
1918 }
1919
1920 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1921 {
1922         struct ieee80211_sub_if_data *sdata =
1923                 (struct ieee80211_sub_if_data *) data;
1924         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1925         struct ieee80211_local *local = sdata->local;
1926
1927         if (local->quiescing)
1928                 return;
1929
1930         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1931 }
1932
1933 static void ieee80211_sta_monitor_work(struct work_struct *work)
1934 {
1935         struct ieee80211_sub_if_data *sdata =
1936                 container_of(work, struct ieee80211_sub_if_data,
1937                              u.mgd.monitor_work);
1938
1939         ieee80211_mgd_probe_ap(sdata, false);
1940 }
1941
1942 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1943 {
1944         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1945                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1946                                         IEEE80211_STA_CONNECTION_POLL);
1947
1948                 /* let's probe the connection once */
1949                 ieee80211_queue_work(&sdata->local->hw,
1950                            &sdata->u.mgd.monitor_work);
1951                 /* and do all the other regular work too */
1952                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1953         }
1954 }
1955
1956 #ifdef CONFIG_PM
1957 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1958 {
1959         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1960
1961         /*
1962          * we need to use atomic bitops for the running bits
1963          * only because both timers might fire at the same
1964          * time -- the code here is properly synchronised.
1965          */
1966
1967         cancel_work_sync(&ifmgd->request_smps_work);
1968
1969         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1970         if (del_timer_sync(&ifmgd->timer))
1971                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1972
1973         cancel_work_sync(&ifmgd->chswitch_work);
1974         if (del_timer_sync(&ifmgd->chswitch_timer))
1975                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1976
1977         cancel_work_sync(&ifmgd->monitor_work);
1978         /* these will just be re-established on connection */
1979         del_timer_sync(&ifmgd->conn_mon_timer);
1980         del_timer_sync(&ifmgd->bcn_mon_timer);
1981 }
1982
1983 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1984 {
1985         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1986
1987         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1988                 add_timer(&ifmgd->timer);
1989         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1990                 add_timer(&ifmgd->chswitch_timer);
1991 }
1992 #endif
1993
1994 /* interface setup */
1995 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1996 {
1997         struct ieee80211_if_managed *ifmgd;
1998
1999         ifmgd = &sdata->u.mgd;
2000         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2001         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2002         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2003                   ieee80211_beacon_connection_loss_work);
2004         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2005         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2006                     (unsigned long) sdata);
2007         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2008                     (unsigned long) sdata);
2009         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2010                     (unsigned long) sdata);
2011         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2012                     (unsigned long) sdata);
2013
2014         ifmgd->flags = 0;
2015
2016         mutex_init(&ifmgd->mtx);
2017
2018         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2019                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2020         else
2021                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2022 }
2023
2024 /* scan finished notification */
2025 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2026 {
2027         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2028
2029         /* Restart STA timers */
2030         rcu_read_lock();
2031         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2032                 ieee80211_restart_sta_timer(sdata);
2033         rcu_read_unlock();
2034 }
2035
2036 int ieee80211_max_network_latency(struct notifier_block *nb,
2037                                   unsigned long data, void *dummy)
2038 {
2039         s32 latency_usec = (s32) data;
2040         struct ieee80211_local *local =
2041                 container_of(nb, struct ieee80211_local,
2042                              network_latency_notifier);
2043
2044         mutex_lock(&local->iflist_mtx);
2045         ieee80211_recalc_ps(local, latency_usec);
2046         mutex_unlock(&local->iflist_mtx);
2047
2048         return 0;
2049 }
2050
2051 /* config hooks */
2052 static enum work_done_result
2053 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2054                           struct sk_buff *skb)
2055 {
2056         if (!skb) {
2057                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2058                 return WORK_DONE_DESTROY;
2059         }
2060
2061         if (wk->type == IEEE80211_WORK_AUTH) {
2062                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2063                 return WORK_DONE_DESTROY;
2064         }
2065
2066         mutex_lock(&wk->sdata->u.mgd.mtx);
2067         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2068         mutex_unlock(&wk->sdata->u.mgd.mtx);
2069
2070         wk->type = IEEE80211_WORK_AUTH;
2071         wk->probe_auth.tries = 0;
2072         return WORK_DONE_REQUEUE;
2073 }
2074
2075 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2076                        struct cfg80211_auth_request *req)
2077 {
2078         const u8 *ssid;
2079         struct ieee80211_work *wk;
2080         u16 auth_alg;
2081
2082         if (req->local_state_change)
2083                 return 0; /* no need to update mac80211 state */
2084
2085         switch (req->auth_type) {
2086         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2087                 auth_alg = WLAN_AUTH_OPEN;
2088                 break;
2089         case NL80211_AUTHTYPE_SHARED_KEY:
2090                 if (IS_ERR(sdata->local->wep_tx_tfm))
2091                         return -EOPNOTSUPP;
2092                 auth_alg = WLAN_AUTH_SHARED_KEY;
2093                 break;
2094         case NL80211_AUTHTYPE_FT:
2095                 auth_alg = WLAN_AUTH_FT;
2096                 break;
2097         case NL80211_AUTHTYPE_NETWORK_EAP:
2098                 auth_alg = WLAN_AUTH_LEAP;
2099                 break;
2100         default:
2101                 return -EOPNOTSUPP;
2102         }
2103
2104         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2105         if (!wk)
2106                 return -ENOMEM;
2107
2108         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2109
2110         if (req->ie && req->ie_len) {
2111                 memcpy(wk->ie, req->ie, req->ie_len);
2112                 wk->ie_len = req->ie_len;
2113         }
2114
2115         if (req->key && req->key_len) {
2116                 wk->probe_auth.key_len = req->key_len;
2117                 wk->probe_auth.key_idx = req->key_idx;
2118                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2119         }
2120
2121         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2122         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2123         wk->probe_auth.ssid_len = ssid[1];
2124
2125         wk->probe_auth.algorithm = auth_alg;
2126         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2127
2128         /* if we already have a probe, don't probe again */
2129         if (req->bss->proberesp_ies)
2130                 wk->type = IEEE80211_WORK_AUTH;
2131         else
2132                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2133         wk->chan = req->bss->channel;
2134         wk->sdata = sdata;
2135         wk->done = ieee80211_probe_auth_done;
2136
2137         ieee80211_add_work(wk);
2138         return 0;
2139 }
2140
2141 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2142                                                   struct sk_buff *skb)
2143 {
2144         struct ieee80211_mgmt *mgmt;
2145         struct ieee80211_rx_status *rx_status;
2146         struct ieee802_11_elems elems;
2147         u16 status;
2148
2149         if (!skb) {
2150                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2151                 return WORK_DONE_DESTROY;
2152         }
2153
2154         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2155                 mutex_lock(&wk->sdata->u.mgd.mtx);
2156                 rx_status = (void *) skb->cb;
2157                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2158                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2159                                       &elems, true);
2160                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2161
2162                 wk->type = IEEE80211_WORK_ASSOC;
2163                 /* not really done yet */
2164                 return WORK_DONE_REQUEUE;
2165         }
2166
2167         mgmt = (void *)skb->data;
2168         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2169
2170         if (status == WLAN_STATUS_SUCCESS) {
2171                 mutex_lock(&wk->sdata->u.mgd.mtx);
2172                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2173                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2174                         /* oops -- internal error -- send timeout for now */
2175                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2176                                                     wk->filter_ta);
2177                         return WORK_DONE_DESTROY;
2178                 }
2179
2180                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2181         }
2182
2183         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2184         return WORK_DONE_DESTROY;
2185 }
2186
2187 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2188                         struct cfg80211_assoc_request *req)
2189 {
2190         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2191         struct ieee80211_bss *bss = (void *)req->bss->priv;
2192         struct ieee80211_work *wk;
2193         const u8 *ssid;
2194         int i;
2195
2196         mutex_lock(&ifmgd->mtx);
2197         if (ifmgd->associated) {
2198                 if (!req->prev_bssid ||
2199                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2200                            ETH_ALEN)) {
2201                         /*
2202                          * We are already associated and the request was not a
2203                          * reassociation request from the current BSS, so
2204                          * reject it.
2205                          */
2206                         mutex_unlock(&ifmgd->mtx);
2207                         return -EALREADY;
2208                 }
2209
2210                 /* Trying to reassociate - clear previous association state */
2211                 ieee80211_set_disassoc(sdata, true, false);
2212         }
2213         mutex_unlock(&ifmgd->mtx);
2214
2215         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2216         if (!wk)
2217                 return -ENOMEM;
2218
2219         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2220         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2221
2222         ifmgd->beacon_crc_valid = false;
2223
2224         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2225                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2226                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2227                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2228                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2229
2230
2231         if (req->ie && req->ie_len) {
2232                 memcpy(wk->ie, req->ie, req->ie_len);
2233                 wk->ie_len = req->ie_len;
2234         } else
2235                 wk->ie_len = 0;
2236
2237         wk->assoc.bss = req->bss;
2238
2239         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2240
2241         /* new association always uses requested smps mode */
2242         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2243                 if (ifmgd->powersave)
2244                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2245                 else
2246                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2247         } else
2248                 ifmgd->ap_smps = ifmgd->req_smps;
2249
2250         wk->assoc.smps = ifmgd->ap_smps;
2251         /*
2252          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2253          * We still associate in non-HT mode (11a/b/g) if any one of these
2254          * ciphers is configured as pairwise.
2255          * We can set this to true for non-11n hardware, that'll be checked
2256          * separately along with the peer capabilities.
2257          */
2258         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2259         wk->assoc.capability = req->bss->capability;
2260         wk->assoc.wmm_used = bss->wmm_used;
2261         wk->assoc.supp_rates = bss->supp_rates;
2262         wk->assoc.supp_rates_len = bss->supp_rates_len;
2263         wk->assoc.ht_information_ie =
2264                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2265
2266         if (bss->wmm_used && bss->uapsd_supported &&
2267             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2268                 wk->assoc.uapsd_used = true;
2269                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2270         } else {
2271                 wk->assoc.uapsd_used = false;
2272                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2273         }
2274
2275         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2276         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2277         wk->assoc.ssid_len = ssid[1];
2278
2279         if (req->prev_bssid)
2280                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2281
2282         wk->chan = req->bss->channel;
2283         wk->sdata = sdata;
2284         wk->done = ieee80211_assoc_done;
2285         if (!bss->dtim_period &&
2286             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2287                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2288         else
2289                 wk->type = IEEE80211_WORK_ASSOC;
2290
2291         if (req->use_mfp) {
2292                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2293                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2294         } else {
2295                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2296                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2297         }
2298
2299         if (req->crypto.control_port)
2300                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2301         else
2302                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2303
2304         sdata->control_port_protocol = req->crypto.control_port_ethertype;
2305         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2306
2307         ieee80211_add_work(wk);
2308         return 0;
2309 }
2310
2311 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2312                          struct cfg80211_deauth_request *req,
2313                          void *cookie)
2314 {
2315         struct ieee80211_local *local = sdata->local;
2316         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2317         struct ieee80211_work *wk;
2318         u8 bssid[ETH_ALEN];
2319         bool assoc_bss = false;
2320
2321         mutex_lock(&ifmgd->mtx);
2322
2323         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2324         if (ifmgd->associated == req->bss) {
2325                 ieee80211_set_disassoc(sdata, false, true);
2326                 mutex_unlock(&ifmgd->mtx);
2327                 assoc_bss = true;
2328         } else {
2329                 bool not_auth_yet = false;
2330
2331                 mutex_unlock(&ifmgd->mtx);
2332
2333                 mutex_lock(&local->mtx);
2334                 list_for_each_entry(wk, &local->work_list, list) {
2335                         if (wk->sdata != sdata)
2336                                 continue;
2337
2338                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2339                             wk->type != IEEE80211_WORK_AUTH &&
2340                             wk->type != IEEE80211_WORK_ASSOC &&
2341                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2342                                 continue;
2343
2344                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2345                                 continue;
2346
2347                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2348                         list_del_rcu(&wk->list);
2349                         free_work(wk);
2350                         break;
2351                 }
2352                 mutex_unlock(&local->mtx);
2353
2354                 /*
2355                  * If somebody requests authentication and we haven't
2356                  * sent out an auth frame yet there's no need to send
2357                  * out a deauth frame either. If the state was PROBE,
2358                  * then this is the case. If it's AUTH we have sent a
2359                  * frame, and if it's IDLE we have completed the auth
2360                  * process already.
2361                  */
2362                 if (not_auth_yet) {
2363                         __cfg80211_auth_canceled(sdata->dev, bssid);
2364                         return 0;
2365                 }
2366         }
2367
2368         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2369                sdata->name, bssid, req->reason_code);
2370
2371         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2372                                        req->reason_code, cookie,
2373                                        !req->local_state_change);
2374         if (assoc_bss)
2375                 sta_info_destroy_addr(sdata, bssid);
2376
2377         mutex_lock(&sdata->local->mtx);
2378         ieee80211_recalc_idle(sdata->local);
2379         mutex_unlock(&sdata->local->mtx);
2380
2381         return 0;
2382 }
2383
2384 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2385                            struct cfg80211_disassoc_request *req,
2386                            void *cookie)
2387 {
2388         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2389         u8 bssid[ETH_ALEN];
2390
2391         mutex_lock(&ifmgd->mtx);
2392
2393         /*
2394          * cfg80211 should catch this ... but it's racy since
2395          * we can receive a disassoc frame, process it, hand it
2396          * to cfg80211 while that's in a locked section already
2397          * trying to tell us that the user wants to disconnect.
2398          */
2399         if (ifmgd->associated != req->bss) {
2400                 mutex_unlock(&ifmgd->mtx);
2401                 return -ENOLINK;
2402         }
2403
2404         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2405                sdata->name, req->bss->bssid, req->reason_code);
2406
2407         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2408         ieee80211_set_disassoc(sdata, false, true);
2409
2410         mutex_unlock(&ifmgd->mtx);
2411
2412         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2413                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2414                         cookie, !req->local_state_change);
2415         sta_info_destroy_addr(sdata, bssid);
2416
2417         mutex_lock(&sdata->local->mtx);
2418         ieee80211_recalc_idle(sdata->local);
2419         mutex_unlock(&sdata->local->mtx);
2420
2421         return 0;
2422 }
2423
2424 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2425                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2426                                gfp_t gfp)
2427 {
2428         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2429
2430         trace_api_cqm_rssi_notify(sdata, rssi_event);
2431
2432         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2433 }
2434 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);