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 <net/mac80211.h>
  23 #include <asm/unaligned.h>
  24
  25 #include "ieee80211_i.h"
  26 #include "driver-ops.h"
  27 #include "rate.h"
  28 #include "led.h"
  29
  30 #define IEEE80211_MAX_PROBE_TRIES 5
  31
  32 /*
  33  * beacon loss detection timeout
  34  * XXX: should depend on beacon interval
  35  */
  36 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
  37 /*
  38  * Time the connection can be idle before we probe
  39  * it to see if we can still talk to the AP.
  40  */
  41 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  42 /*
  43  * Time we wait for a probe response after sending
  44  * a probe request because of beacon loss or for
  45  * checking the connection still works.
  46  */
  47 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  48
  49 /*
  50  * Weight given to the latest Beacon frame when calculating average signal
  51  * strength for Beacon frames received in the current BSS. This must be
  52  * between 1 and 15.
  53  */
  54 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  55
  56 #define TMR_RUNNING_TIMER       0
  57 #define TMR_RUNNING_CHANSW      1
  58
  59 /*
  60  * All cfg80211 functions have to be called outside a locked
  61  * section so that they can acquire a lock themselves... This
  62  * is much simpler than queuing up things in cfg80211, but we
  63  * do need some indirection for that here.
  64  */
  65 enum rx_mgmt_action {
  66         /* no action required */
  67         RX_MGMT_NONE,
  68
  69         /* caller must call cfg80211_send_rx_auth() */
  70         RX_MGMT_CFG80211_AUTH,
  71
  72         /* caller must call cfg80211_send_rx_assoc() */
  73         RX_MGMT_CFG80211_ASSOC,
  74
  75         /* caller must call cfg80211_send_deauth() */
  76         RX_MGMT_CFG80211_DEAUTH,
  77
  78         /* caller must call cfg80211_send_disassoc() */
  79         RX_MGMT_CFG80211_DISASSOC,
  80
  81         /* caller must tell cfg80211 about internal error */
  82         RX_MGMT_CFG80211_ASSOC_ERROR,
  83 };
  84
  85 /* utils */
  86 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  87 {
  88         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  89 }
  90
  91 /*
  92  * We can have multiple work items (and connection probing)
  93  * scheduling this timer, but we need to take care to only
  94  * reschedule it when it should fire _earlier_ than it was
  95  * asked for before, or if it's not pending right now. This
  96  * function ensures that. Note that it then is required to
  97  * run this function for all timeouts after the first one
  98  * has happened -- the work that runs from this timer will
  99  * do that.
 100  */
 101 static void run_again(struct ieee80211_if_managed *ifmgd,
 102                              unsigned long timeout)
 103 {
 104         ASSERT_MGD_MTX(ifmgd);
 105
 106         if (!timer_pending(&ifmgd->timer) ||
 107             time_before(timeout, ifmgd->timer.expires))
 108                 mod_timer(&ifmgd->timer, timeout);
 109 }
 110
 111 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 112 {
 113         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 114                 return;
 115
 116         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 117                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 118 }
 119
 120 static int ecw2cw(int ecw)
 121 {
 122         return (1 << ecw) - 1;
 123 }
 124
 125 /*
 126  * ieee80211_enable_ht should be called only after the operating band
 127  * has been determined as ht configuration depends on the hw's
 128  * HT abilities for a specific band.
 129  */
 130 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 131                                struct ieee80211_ht_info *hti,
 132                                const u8 *bssid, u16 ap_ht_cap_flags)
 133 {
 134         struct ieee80211_local *local = sdata->local;
 135         struct ieee80211_supported_band *sband;
 136         struct sta_info *sta;
 137         u32 changed = 0;
 138         u16 ht_opmode;
 139         bool enable_ht = true;
 140         enum nl80211_channel_type prev_chantype;
 141         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 142
 143         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 144
 145         prev_chantype = sdata->vif.bss_conf.channel_type;
 146
 147         /* HT is not supported */
 148         if (!sband->ht_cap.ht_supported)
 149                 enable_ht = false;
 150
 151         /* check that channel matches the right operating channel */
 152         if (local->hw.conf.channel->center_freq !=
 153             ieee80211_channel_to_frequency(hti->control_chan))
 154                 enable_ht = false;
 155
 156         if (enable_ht) {
 157                 channel_type = NL80211_CHAN_HT20;
 158
 159                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 160                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 161                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 162                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 163                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 164                                 if (!(local->hw.conf.channel->flags &
 165                                     IEEE80211_CHAN_NO_HT40PLUS))
 166                                         channel_type = NL80211_CHAN_HT40PLUS;
 167                                 break;
 168                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 169                                 if (!(local->hw.conf.channel->flags &
 170                                     IEEE80211_CHAN_NO_HT40MINUS))
 171                                         channel_type = NL80211_CHAN_HT40MINUS;
 172                                 break;
 173                         }
 174                 }
 175         }
 176
 177         if (local->tmp_channel)
 178                 local->tmp_channel_type = channel_type;
 179
 180         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 181                 /* can only fail due to HT40+/- mismatch */
 182                 channel_type = NL80211_CHAN_HT20;
 183                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 184         }
 185
 186         /* channel_type change automatically detected */
 187         ieee80211_hw_config(local, 0);
 188
 189         if (prev_chantype != channel_type) {
 190                 rcu_read_lock();
 191                 sta = sta_info_get(sdata, bssid);
 192                 if (sta)
 193                         rate_control_rate_update(local, sband, sta,
 194                                                  IEEE80211_RC_HT_CHANGED,
 195                                                  channel_type);
 196                 rcu_read_unlock();
 197         }
 198
 199         ht_opmode = le16_to_cpu(hti->operation_mode);
 200
 201         /* if bss configuration changed store the new one */
 202         if (sdata->ht_opmode_valid != enable_ht ||
 203             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 204             prev_chantype != channel_type) {
 205                 changed |= BSS_CHANGED_HT;
 206                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 207                 sdata->ht_opmode_valid = enable_ht;
 208         }
 209
 210         return changed;
 211 }
 212
 213 /* frame sending functions */
 214
 215 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 216                                            const u8 *bssid, u16 stype, u16 reason,
 217                                            void *cookie, bool send_frame)
 218 {
 219         struct ieee80211_local *local = sdata->local;
 220         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 221         struct sk_buff *skb;
 222         struct ieee80211_mgmt *mgmt;
 223
 224         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 225         if (!skb) {
 226                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 227                        "deauth/disassoc frame\n", sdata->name);
 228                 return;
 229         }
 230         skb_reserve(skb, local->hw.extra_tx_headroom);
 231
 232         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 233         memset(mgmt, 0, 24);
 234         memcpy(mgmt->da, bssid, ETH_ALEN);
 235         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 236         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 237         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 238         skb_put(skb, 2);
 239         /* u.deauth.reason_code == u.disassoc.reason_code */
 240         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 241
 242         if (stype == IEEE80211_STYPE_DEAUTH)
 243                 if (cookie)
 244                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 245                 else
 246                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 247         else
 248                 if (cookie)
 249                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 250                 else
 251                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 252         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 253                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 254
 255         if (send_frame)
 256                 ieee80211_tx_skb(sdata, skb);
 257         else
 258                 kfree_skb(skb);
 259 }
 260
 261 void ieee80211_send_pspoll(struct ieee80211_local *local,
 262                            struct ieee80211_sub_if_data *sdata)
 263 {
 264         struct ieee80211_pspoll *pspoll;
 265         struct sk_buff *skb;
 266
 267         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 268         if (!skb)
 269                 return;
 270
 271         pspoll = (struct ieee80211_pspoll *) skb->data;
 272         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 273
 274         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 275         ieee80211_tx_skb(sdata, skb);
 276 }
 277
 278 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 279                              struct ieee80211_sub_if_data *sdata,
 280                              int powersave)
 281 {
 282         struct sk_buff *skb;
 283         struct ieee80211_hdr_3addr *nullfunc;
 284
 285         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 286         if (!skb)
 287                 return;
 288
 289         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 290         if (powersave)
 291                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 292
 293         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 294         ieee80211_tx_skb(sdata, skb);
 295 }
 296
 297 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 298                                           struct ieee80211_sub_if_data *sdata)
 299 {
 300         struct sk_buff *skb;
 301         struct ieee80211_hdr *nullfunc;
 302         __le16 fc;
 303
 304         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 305                 return;
 306
 307         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 308         if (!skb) {
 309                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 310                        "nullfunc frame\n", sdata->name);
 311                 return;
 312         }
 313         skb_reserve(skb, local->hw.extra_tx_headroom);
 314
 315         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 316         memset(nullfunc, 0, 30);
 317         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 318                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 319         nullfunc->frame_control = fc;
 320         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 321         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 322         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 323         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 324
 325         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 326         ieee80211_tx_skb(sdata, skb);
 327 }
 328
 329 /* spectrum management related things */
 330 static void ieee80211_chswitch_work(struct work_struct *work)
 331 {
 332         struct ieee80211_sub_if_data *sdata =
 333                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 334         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 335
 336         if (!ieee80211_sdata_running(sdata))
 337                 return;
 338
 339         mutex_lock(&ifmgd->mtx);
 340         if (!ifmgd->associated)
 341                 goto out;
 342
 343         sdata->local->oper_channel = sdata->local->csa_channel;
 344         if (!sdata->local->ops->channel_switch) {
 345                 /* call "hw_config" only if doing sw channel switch */
 346                 ieee80211_hw_config(sdata->local,
 347                         IEEE80211_CONF_CHANGE_CHANNEL);
 348         }
 349
 350         /* XXX: shouldn't really modify cfg80211-owned data! */
 351         ifmgd->associated->channel = sdata->local->oper_channel;
 352
 353         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 354                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 355  out:
 356         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 357         mutex_unlock(&ifmgd->mtx);
 358 }
 359
 360 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 361 {
 362         struct ieee80211_sub_if_data *sdata;
 363         struct ieee80211_if_managed *ifmgd;
 364
 365         sdata = vif_to_sdata(vif);
 366         ifmgd = &sdata->u.mgd;
 367
 368         trace_api_chswitch_done(sdata, success);
 369         if (!success) {
 370                 /*
 371                  * If the channel switch was not successful, stay
 372                  * around on the old channel. We currently lack
 373                  * good handling of this situation, possibly we
 374                  * should just drop the association.
 375                  */
 376                 sdata->local->csa_channel = sdata->local->oper_channel;
 377         }
 378
 379         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 380 }
 381 EXPORT_SYMBOL(ieee80211_chswitch_done);
 382
 383 static void ieee80211_chswitch_timer(unsigned long data)
 384 {
 385         struct ieee80211_sub_if_data *sdata =
 386                 (struct ieee80211_sub_if_data *) data;
 387         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 388
 389         if (sdata->local->quiescing) {
 390                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 391                 return;
 392         }
 393
 394         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 395 }
 396
 397 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 398                                       struct ieee80211_channel_sw_ie *sw_elem,
 399                                       struct ieee80211_bss *bss,
 400                                       u64 timestamp)
 401 {
 402         struct cfg80211_bss *cbss =
 403                 container_of((void *)bss, struct cfg80211_bss, priv);
 404         struct ieee80211_channel *new_ch;
 405         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 406         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 407
 408         ASSERT_MGD_MTX(ifmgd);
 409
 410         if (!ifmgd->associated)
 411                 return;
 412
 413         if (sdata->local->scanning)
 414                 return;
 415
 416         /* Disregard subsequent beacons if we are already running a timer
 417            processing a CSA */
 418
 419         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 420                 return;
 421
 422         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 423         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 424                 return;
 425
 426         sdata->local->csa_channel = new_ch;
 427
 428         if (sdata->local->ops->channel_switch) {
 429                 /* use driver's channel switch callback */
 430                 struct ieee80211_channel_switch ch_switch;
 431                 memset(&ch_switch, 0, sizeof(ch_switch));
 432                 ch_switch.timestamp = timestamp;
 433                 if (sw_elem->mode) {
 434                         ch_switch.block_tx = true;
 435                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 436                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 437                 }
 438                 ch_switch.channel = new_ch;
 439                 ch_switch.count = sw_elem->count;
 440                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 441                 drv_channel_switch(sdata->local, &ch_switch);
 442                 return;
 443         }
 444
 445         /* channel switch handled in software */
 446         if (sw_elem->count <= 1) {
 447                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 448         } else {
 449                 if (sw_elem->mode)
 450                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 451                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 452                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 453                 mod_timer(&ifmgd->chswitch_timer,
 454                           jiffies +
 455                           msecs_to_jiffies(sw_elem->count *
 456                                            cbss->beacon_interval));
 457         }
 458 }
 459
 460 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 461                                         u16 capab_info, u8 *pwr_constr_elem,
 462                                         u8 pwr_constr_elem_len)
 463 {
 464         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 465
 466         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 467                 return;
 468
 469         /* Power constraint IE length should be 1 octet */
 470         if (pwr_constr_elem_len != 1)
 471                 return;
 472
 473         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 474             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 475                 sdata->local->power_constr_level = *pwr_constr_elem;
 476                 ieee80211_hw_config(sdata->local, 0);
 477         }
 478 }
 479
 480 /* powersave */
 481 static void ieee80211_enable_ps(struct ieee80211_local *local,
 482                                 struct ieee80211_sub_if_data *sdata)
 483 {
 484         struct ieee80211_conf *conf = &local->hw.conf;
 485
 486         /*
 487          * If we are scanning right now then the parameters will
 488          * take effect when scan finishes.
 489          */
 490         if (local->scanning)
 491                 return;
 492
 493         if (conf->dynamic_ps_timeout > 0 &&
 494             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 495                 mod_timer(&local->dynamic_ps_timer, jiffies +
 496                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 497         } else {
 498                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 499                         ieee80211_send_nullfunc(local, sdata, 1);
 500
 501                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 502                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 503                         return;
 504
 505                 conf->flags |= IEEE80211_CONF_PS;
 506                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 507         }
 508 }
 509
 510 static void ieee80211_change_ps(struct ieee80211_local *local)
 511 {
 512         struct ieee80211_conf *conf = &local->hw.conf;
 513
 514         if (local->ps_sdata) {
 515                 ieee80211_enable_ps(local, local->ps_sdata);
 516         } else if (conf->flags & IEEE80211_CONF_PS) {
 517                 conf->flags &= ~IEEE80211_CONF_PS;
 518                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 519                 del_timer_sync(&local->dynamic_ps_timer);
 520                 cancel_work_sync(&local->dynamic_ps_enable_work);
 521         }
 522 }
 523
 524 /* need to hold RTNL or interface lock */
 525 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 526 {
 527         struct ieee80211_sub_if_data *sdata, *found = NULL;
 528         int count = 0;
 529         int timeout;
 530
 531         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 532                 local->ps_sdata = NULL;
 533                 return;
 534         }
 535
 536         if (!list_empty(&local->work_list)) {
 537                 local->ps_sdata = NULL;
 538                 goto change;
 539         }
 540
 541         list_for_each_entry(sdata, &local->interfaces, list) {
 542                 if (!ieee80211_sdata_running(sdata))
 543                         continue;
 544                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 545                         continue;
 546                 found = sdata;
 547                 count++;
 548         }
 549
 550         if (count == 1 && found->u.mgd.powersave &&
 551             found->u.mgd.associated &&
 552             found->u.mgd.associated->beacon_ies &&
 553             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 554                                     IEEE80211_STA_CONNECTION_POLL))) {
 555                 s32 beaconint_us;
 556
 557                 if (latency < 0)
 558                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 559
 560                 beaconint_us = ieee80211_tu_to_usec(
 561                                         found->vif.bss_conf.beacon_int);
 562
 563                 timeout = local->hw.conf.dynamic_ps_forced_timeout;
 564                 if (timeout < 0) {
 565                         /*
 566                          * The 2 second value is there for compatibility until
 567                          * the PM_QOS_NETWORK_LATENCY is configured with real
 568                          * values.
 569                          */
 570                         if (latency == 2000000000)
 571                                 timeout = 100;
 572                         else if (latency <= 50000)
 573                                 timeout = 300;
 574                         else if (latency <= 100000)
 575                                 timeout = 100;
 576                         else if (latency <= 500000)
 577                                 timeout = 50;
 578                         else
 579                                 timeout = 0;
 580                 }
 581                 local->hw.conf.dynamic_ps_timeout = timeout;
 582
 583                 if (beaconint_us > latency) {
 584                         local->ps_sdata = NULL;
 585                 } else {
 586                         struct ieee80211_bss *bss;
 587                         int maxslp = 1;
 588                         u8 dtimper;
 589
 590                         bss = (void *)found->u.mgd.associated->priv;
 591                         dtimper = bss->dtim_period;
 592
 593                         /* If the TIM IE is invalid, pretend the value is 1 */
 594                         if (!dtimper)
 595                                 dtimper = 1;
 596                         else if (dtimper > 1)
 597                                 maxslp = min_t(int, dtimper,
 598                                                     latency / beaconint_us);
 599
 600                         local->hw.conf.max_sleep_period = maxslp;
 601                         local->hw.conf.ps_dtim_period = dtimper;
 602                         local->ps_sdata = found;
 603                 }
 604         } else {
 605                 local->ps_sdata = NULL;
 606         }
 607
 608  change:
 609         ieee80211_change_ps(local);
 610 }
 611
 612 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 613 {
 614         struct ieee80211_local *local =
 615                 container_of(work, struct ieee80211_local,
 616                              dynamic_ps_disable_work);
 617
 618         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 619                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 620                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 621         }
 622
 623         ieee80211_wake_queues_by_reason(&local->hw,
 624                                         IEEE80211_QUEUE_STOP_REASON_PS);
 625 }
 626
 627 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 628 {
 629         struct ieee80211_local *local =
 630                 container_of(work, struct ieee80211_local,
 631                              dynamic_ps_enable_work);
 632         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 633         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 634
 635         /* can only happen when PS was just disabled anyway */
 636         if (!sdata)
 637                 return;
 638
 639         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 640                 return;
 641
 642         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 643             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 644                 ieee80211_send_nullfunc(local, sdata, 1);
 645
 646         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 647               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 648             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 649                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 650                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 651                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 652         }
 653 }
 654
 655 void ieee80211_dynamic_ps_timer(unsigned long data)
 656 {
 657         struct ieee80211_local *local = (void *) data;
 658
 659         if (local->quiescing || local->suspended)
 660                 return;
 661
 662         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 663 }
 664
 665 /* MLME */
 666 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 667                                      struct ieee80211_if_managed *ifmgd,
 668                                      u8 *wmm_param, size_t wmm_param_len)
 669 {
 670         struct ieee80211_tx_queue_params params;
 671         size_t left;
 672         int count;
 673         u8 *pos, uapsd_queues = 0;
 674
 675         if (!local->ops->conf_tx)
 676                 return;
 677
 678         if (local->hw.queues < 4)
 679                 return;
 680
 681         if (!wmm_param)
 682                 return;
 683
 684         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 685                 return;
 686
 687         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 688                 uapsd_queues = local->uapsd_queues;
 689
 690         count = wmm_param[6] & 0x0f;
 691         if (count == ifmgd->wmm_last_param_set)
 692                 return;
 693         ifmgd->wmm_last_param_set = count;
 694
 695         pos = wmm_param + 8;
 696         left = wmm_param_len - 8;
 697
 698         memset(&params, 0, sizeof(params));
 699
 700         local->wmm_acm = 0;
 701         for (; left >= 4; left -= 4, pos += 4) {
 702                 int aci = (pos[0] >> 5) & 0x03;
 703                 int acm = (pos[0] >> 4) & 0x01;
 704                 bool uapsd = false;
 705                 int queue;
 706
 707                 switch (aci) {
 708                 case 1: /* AC_BK */
 709                         queue = 3;
 710                         if (acm)
 711                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 712                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 713                                 uapsd = true;
 714                         break;
 715                 case 2: /* AC_VI */
 716                         queue = 1;
 717                         if (acm)
 718                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 719                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 720                                 uapsd = true;
 721                         break;
 722                 case 3: /* AC_VO */
 723                         queue = 0;
 724                         if (acm)
 725                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 726                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 727                                 uapsd = true;
 728                         break;
 729                 case 0: /* AC_BE */
 730                 default:
 731                         queue = 2;
 732                         if (acm)
 733                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 734                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 735                                 uapsd = true;
 736                         break;
 737                 }
 738
 739                 params.aifs = pos[0] & 0x0f;
 740                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 741                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 742                 params.txop = get_unaligned_le16(pos + 2);
 743                 params.uapsd = uapsd;
 744
 745 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 746                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 747                        "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 748                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 749                        params.aifs, params.cw_min, params.cw_max, params.txop,
 750                        params.uapsd);
 751 #endif
 752                 if (drv_conf_tx(local, queue, &params))
 753                         printk(KERN_DEBUG "%s: failed to set TX queue "
 754                                "parameters for queue %d\n",
 755                                wiphy_name(local->hw.wiphy), queue);
 756         }
 757
 758         /* enable WMM or activate new settings */
 759         local->hw.conf.flags |= IEEE80211_CONF_QOS;
 760         drv_config(local, IEEE80211_CONF_CHANGE_QOS);
 761 }
 762
 763 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 764                                            u16 capab, bool erp_valid, u8 erp)
 765 {
 766         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 767         u32 changed = 0;
 768         bool use_protection;
 769         bool use_short_preamble;
 770         bool use_short_slot;
 771
 772         if (erp_valid) {
 773                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 774                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 775         } else {
 776                 use_protection = false;
 777                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 778         }
 779
 780         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 781         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 782                 use_short_slot = true;
 783
 784         if (use_protection != bss_conf->use_cts_prot) {
 785                 bss_conf->use_cts_prot = use_protection;
 786                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 787         }
 788
 789         if (use_short_preamble != bss_conf->use_short_preamble) {
 790                 bss_conf->use_short_preamble = use_short_preamble;
 791                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 792         }
 793
 794         if (use_short_slot != bss_conf->use_short_slot) {
 795                 bss_conf->use_short_slot = use_short_slot;
 796                 changed |= BSS_CHANGED_ERP_SLOT;
 797         }
 798
 799         return changed;
 800 }
 801
 802 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 803                                      struct cfg80211_bss *cbss,
 804                                      u32 bss_info_changed)
 805 {
 806         struct ieee80211_bss *bss = (void *)cbss->priv;
 807         struct ieee80211_local *local = sdata->local;
 808
 809         bss_info_changed |= BSS_CHANGED_ASSOC;
 810         /* set timing information */
 811         sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
 812         sdata->vif.bss_conf.timestamp = cbss->tsf;
 813
 814         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 815         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 816                 cbss->capability, bss->has_erp_value, bss->erp_value);
 817
 818         sdata->u.mgd.associated = cbss;
 819         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 820
 821         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 822
 823         /* just to be sure */
 824         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 825                                 IEEE80211_STA_BEACON_POLL);
 826
 827         /*
 828          * Always handle WMM once after association regardless
 829          * of the first value the AP uses. Setting -1 here has
 830          * that effect because the AP values is an unsigned
 831          * 4-bit value.
 832          */
 833         sdata->u.mgd.wmm_last_param_set = -1;
 834
 835         ieee80211_led_assoc(local, 1);
 836
 837         sdata->vif.bss_conf.assoc = 1;
 838         /*
 839          * For now just always ask the driver to update the basic rateset
 840          * when we have associated, we aren't checking whether it actually
 841          * changed or not.
 842          */
 843         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 844
 845         /* And the BSSID changed - we're associated now */
 846         bss_info_changed |= BSS_CHANGED_BSSID;
 847
 848         /* Tell the driver to monitor connection quality (if supported) */
 849         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 850             sdata->vif.bss_conf.cqm_rssi_thold)
 851                 bss_info_changed |= BSS_CHANGED_CQM;
 852
 853         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 854
 855         mutex_lock(&local->iflist_mtx);
 856         ieee80211_recalc_ps(local, -1);
 857         ieee80211_recalc_smps(local, sdata);
 858         mutex_unlock(&local->iflist_mtx);
 859
 860         netif_tx_start_all_queues(sdata->dev);
 861         netif_carrier_on(sdata->dev);
 862 }
 863
 864 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 865                                    bool remove_sta)
 866 {
 867         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 868         struct ieee80211_local *local = sdata->local;
 869         struct sta_info *sta;
 870         u32 changed = 0, config_changed = 0;
 871         u8 bssid[ETH_ALEN];
 872
 873         ASSERT_MGD_MTX(ifmgd);
 874
 875         if (WARN_ON(!ifmgd->associated))
 876                 return;
 877
 878         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 879
 880         ifmgd->associated = NULL;
 881         memset(ifmgd->bssid, 0, ETH_ALEN);
 882
 883         /*
 884          * we need to commit the associated = NULL change because the
 885          * scan code uses that to determine whether this iface should
 886          * go to/wake up from powersave or not -- and could otherwise
 887          * wake the queues erroneously.
 888          */
 889         smp_mb();
 890
 891         /*
 892          * Thus, we can only afterwards stop the queues -- to account
 893          * for the case where another CPU is finishing a scan at this
 894          * time -- we don't want the scan code to enable queues.
 895          */
 896
 897         netif_tx_stop_all_queues(sdata->dev);
 898         netif_carrier_off(sdata->dev);
 899
 900         rcu_read_lock();
 901         sta = sta_info_get(sdata, bssid);
 902         if (sta) {
 903                 set_sta_flags(sta, WLAN_STA_DISASSOC);
 904                 ieee80211_sta_tear_down_BA_sessions(sta);
 905         }
 906         rcu_read_unlock();
 907
 908         changed |= ieee80211_reset_erp_info(sdata);
 909
 910         ieee80211_led_assoc(local, 0);
 911         changed |= BSS_CHANGED_ASSOC;
 912         sdata->vif.bss_conf.assoc = false;
 913
 914         ieee80211_set_wmm_default(sdata);
 915
 916         /* channel(_type) changes are handled by ieee80211_hw_config */
 917         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
 918
 919         /* on the next assoc, re-program HT parameters */
 920         sdata->ht_opmode_valid = false;
 921
 922         local->power_constr_level = 0;
 923
 924         del_timer_sync(&local->dynamic_ps_timer);
 925         cancel_work_sync(&local->dynamic_ps_enable_work);
 926
 927         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 928                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 929                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 930         }
 931
 932         ieee80211_hw_config(local, config_changed);
 933
 934         /* The BSSID (not really interesting) and HT changed */
 935         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
 936         ieee80211_bss_info_change_notify(sdata, changed);
 937
 938         if (remove_sta)
 939                 sta_info_destroy_addr(sdata, bssid);
 940 }
 941
 942 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 943                              struct ieee80211_hdr *hdr)
 944 {
 945         /*
 946          * We can postpone the mgd.timer whenever receiving unicast frames
 947          * from AP because we know that the connection is working both ways
 948          * at that time. But multicast frames (and hence also beacons) must
 949          * be ignored here, because we need to trigger the timer during
 950          * data idle periods for sending the periodic probe request to the
 951          * AP we're connected to.
 952          */
 953         if (is_multicast_ether_addr(hdr->addr1))
 954                 return;
 955
 956         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 957                 return;
 958
 959         mod_timer(&sdata->u.mgd.conn_mon_timer,
 960                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 961 }
 962
 963 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
 964 {
 965         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 966         const u8 *ssid;
 967
 968         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
 969         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
 970                                  ssid + 2, ssid[1], NULL, 0);
 971
 972         ifmgd->probe_send_count++;
 973         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
 974         run_again(ifmgd, ifmgd->probe_timeout);
 975 }
 976
 977 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
 978                                    bool beacon)
 979 {
 980         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 981         bool already = false;
 982
 983         if (!ieee80211_sdata_running(sdata))
 984                 return;
 985
 986         if (sdata->local->scanning)
 987                 return;
 988
 989         if (sdata->local->tmp_channel)
 990                 return;
 991
 992         mutex_lock(&ifmgd->mtx);
 993
 994         if (!ifmgd->associated)
 995                 goto out;
 996
 997 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 998         if (beacon && net_ratelimit())
 999                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1000                        "- sending probe request\n", sdata->name);
1001 #endif
1002
1003         /*
1004          * The driver/our work has already reported this event or the
1005          * connection monitoring has kicked in and we have already sent
1006          * a probe request. Or maybe the AP died and the driver keeps
1007          * reporting until we disassociate...
1008          *
1009          * In either case we have to ignore the current call to this
1010          * function (except for setting the correct probe reason bit)
1011          * because otherwise we would reset the timer every time and
1012          * never check whether we received a probe response!
1013          */
1014         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1015                             IEEE80211_STA_CONNECTION_POLL))
1016                 already = true;
1017
1018         if (beacon)
1019                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1020         else
1021                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1022
1023         if (already)
1024                 goto out;
1025
1026         mutex_lock(&sdata->local->iflist_mtx);
1027         ieee80211_recalc_ps(sdata->local, -1);
1028         mutex_unlock(&sdata->local->iflist_mtx);
1029
1030         ifmgd->probe_send_count = 0;
1031         ieee80211_mgd_probe_ap_send(sdata);
1032  out:
1033         mutex_unlock(&ifmgd->mtx);
1034 }
1035
1036 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1037 {
1038         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1039         struct ieee80211_local *local = sdata->local;
1040         u8 bssid[ETH_ALEN];
1041
1042         mutex_lock(&ifmgd->mtx);
1043         if (!ifmgd->associated) {
1044                 mutex_unlock(&ifmgd->mtx);
1045                 return;
1046         }
1047
1048         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1049
1050         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1051
1052         ieee80211_set_disassoc(sdata, true);
1053         ieee80211_recalc_idle(local);
1054         mutex_unlock(&ifmgd->mtx);
1055         /*
1056          * must be outside lock due to cfg80211,
1057          * but that's not a problem.
1058          */
1059         ieee80211_send_deauth_disassoc(sdata, bssid,
1060                                        IEEE80211_STYPE_DEAUTH,
1061                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1062                                        NULL, true);
1063 }
1064
1065 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1066 {
1067         struct ieee80211_sub_if_data *sdata =
1068                 container_of(work, struct ieee80211_sub_if_data,
1069                              u.mgd.beacon_connection_loss_work);
1070
1071         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1072                 __ieee80211_connection_loss(sdata);
1073         else
1074                 ieee80211_mgd_probe_ap(sdata, true);
1075 }
1076
1077 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1078 {
1079         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1080         struct ieee80211_hw *hw = &sdata->local->hw;
1081
1082         trace_api_beacon_loss(sdata);
1083
1084         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1085         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1086 }
1087 EXPORT_SYMBOL(ieee80211_beacon_loss);
1088
1089 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1090 {
1091         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1092         struct ieee80211_hw *hw = &sdata->local->hw;
1093
1094         trace_api_connection_loss(sdata);
1095
1096         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1097         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1098 }
1099 EXPORT_SYMBOL(ieee80211_connection_loss);
1100
1101
1102 static enum rx_mgmt_action __must_check
1103 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1104                          struct ieee80211_mgmt *mgmt, size_t len)
1105 {
1106         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1107         const u8 *bssid = NULL;
1108         u16 reason_code;
1109
1110         if (len < 24 + 2)
1111                 return RX_MGMT_NONE;
1112
1113         ASSERT_MGD_MTX(ifmgd);
1114
1115         bssid = ifmgd->associated->bssid;
1116
1117         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1118
1119         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1120                         sdata->name, bssid, reason_code);
1121
1122         ieee80211_set_disassoc(sdata, true);
1123         ieee80211_recalc_idle(sdata->local);
1124
1125         return RX_MGMT_CFG80211_DEAUTH;
1126 }
1127
1128
1129 static enum rx_mgmt_action __must_check
1130 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1131                            struct ieee80211_mgmt *mgmt, size_t len)
1132 {
1133         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1134         u16 reason_code;
1135
1136         if (len < 24 + 2)
1137                 return RX_MGMT_NONE;
1138
1139         ASSERT_MGD_MTX(ifmgd);
1140
1141         if (WARN_ON(!ifmgd->associated))
1142                 return RX_MGMT_NONE;
1143
1144         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1145                 return RX_MGMT_NONE;
1146
1147         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1148
1149         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1150                         sdata->name, mgmt->sa, reason_code);
1151
1152         ieee80211_set_disassoc(sdata, true);
1153         ieee80211_recalc_idle(sdata->local);
1154         return RX_MGMT_CFG80211_DISASSOC;
1155 }
1156
1157
1158 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1159                                     struct ieee80211_mgmt *mgmt, size_t len)
1160 {
1161         struct ieee80211_sub_if_data *sdata = wk->sdata;
1162         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1163         struct ieee80211_local *local = sdata->local;
1164         struct ieee80211_supported_band *sband;
1165         struct sta_info *sta;
1166         struct cfg80211_bss *cbss = wk->assoc.bss;
1167         u8 *pos;
1168         u32 rates, basic_rates;
1169         u16 capab_info, aid;
1170         struct ieee802_11_elems elems;
1171         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1172         u32 changed = 0;
1173         int i, j, err;
1174         bool have_higher_than_11mbit = false;
1175         u16 ap_ht_cap_flags;
1176
1177         /* AssocResp and ReassocResp have identical structure */
1178
1179         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1180         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1181
1182         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1183                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1184                        "set\n", sdata->name, aid);
1185         aid &= ~(BIT(15) | BIT(14));
1186
1187         pos = mgmt->u.assoc_resp.variable;
1188         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1189
1190         if (!elems.supp_rates) {
1191                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1192                        sdata->name);
1193                 return false;
1194         }
1195
1196         ifmgd->aid = aid;
1197
1198         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1199         if (!sta) {
1200                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1201                        " the AP\n", sdata->name);
1202                 return false;
1203         }
1204
1205         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1206                            WLAN_STA_ASSOC_AP);
1207         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1208                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1209
1210         rates = 0;
1211         basic_rates = 0;
1212         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1213
1214         for (i = 0; i < elems.supp_rates_len; i++) {
1215                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1216                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1217
1218                 if (rate > 110)
1219                         have_higher_than_11mbit = true;
1220
1221                 for (j = 0; j < sband->n_bitrates; j++) {
1222                         if (sband->bitrates[j].bitrate == rate) {
1223                                 rates |= BIT(j);
1224                                 if (is_basic)
1225                                         basic_rates |= BIT(j);
1226                                 break;
1227                         }
1228                 }
1229         }
1230
1231         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1232                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1233                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1234
1235                 if (rate > 110)
1236                         have_higher_than_11mbit = true;
1237
1238                 for (j = 0; j < sband->n_bitrates; j++) {
1239                         if (sband->bitrates[j].bitrate == rate) {
1240                                 rates |= BIT(j);
1241                                 if (is_basic)
1242                                         basic_rates |= BIT(j);
1243                                 break;
1244                         }
1245                 }
1246         }
1247
1248         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1249         sdata->vif.bss_conf.basic_rates = basic_rates;
1250
1251         /* cf. IEEE 802.11 9.2.12 */
1252         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1253             have_higher_than_11mbit)
1254                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1255         else
1256                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1257
1258         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1259                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1260                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1261
1262         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1263
1264         rate_control_rate_init(sta);
1265
1266         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1267                 set_sta_flags(sta, WLAN_STA_MFP);
1268
1269         if (elems.wmm_param)
1270                 set_sta_flags(sta, WLAN_STA_WME);
1271
1272         err = sta_info_insert(sta);
1273         sta = NULL;
1274         if (err) {
1275                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1276                        " the AP (error %d)\n", sdata->name, err);
1277                 return false;
1278         }
1279
1280         if (elems.wmm_param)
1281                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1282                                          elems.wmm_param_len);
1283         else
1284                 ieee80211_set_wmm_default(sdata);
1285
1286         local->oper_channel = wk->chan;
1287
1288         if (elems.ht_info_elem && elems.wmm_param &&
1289             (sdata->local->hw.queues >= 4) &&
1290             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1291                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1292                                                cbss->bssid, ap_ht_cap_flags);
1293
1294         /* set AID and assoc capability,
1295          * ieee80211_set_associated() will tell the driver */
1296         bss_conf->aid = aid;
1297         bss_conf->assoc_capability = capab_info;
1298         ieee80211_set_associated(sdata, cbss, changed);
1299
1300         /*
1301          * If we're using 4-addr mode, let the AP know that we're
1302          * doing so, so that it can create the STA VLAN on its side
1303          */
1304         if (ifmgd->use_4addr)
1305                 ieee80211_send_4addr_nullfunc(local, sdata);
1306
1307         /*
1308          * Start timer to probe the connection to the AP now.
1309          * Also start the timer that will detect beacon loss.
1310          */
1311         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1312         mod_beacon_timer(sdata);
1313
1314         return true;
1315 }
1316
1317
1318 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1319                                   struct ieee80211_mgmt *mgmt,
1320                                   size_t len,
1321                                   struct ieee80211_rx_status *rx_status,
1322                                   struct ieee802_11_elems *elems,
1323                                   bool beacon)
1324 {
1325         struct ieee80211_local *local = sdata->local;
1326         int freq;
1327         struct ieee80211_bss *bss;
1328         struct ieee80211_channel *channel;
1329         bool need_ps = false;
1330
1331         if (sdata->u.mgd.associated) {
1332                 bss = (void *)sdata->u.mgd.associated->priv;
1333                 /* not previously set so we may need to recalc */
1334                 need_ps = !bss->dtim_period;
1335         }
1336
1337         if (elems->ds_params && elems->ds_params_len == 1)
1338                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1339         else
1340                 freq = rx_status->freq;
1341
1342         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1343
1344         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1345                 return;
1346
1347         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1348                                         channel, beacon);
1349         if (bss)
1350                 ieee80211_rx_bss_put(local, bss);
1351
1352         if (!sdata->u.mgd.associated)
1353                 return;
1354
1355         if (need_ps) {
1356                 mutex_lock(&local->iflist_mtx);
1357                 ieee80211_recalc_ps(local, -1);
1358                 mutex_unlock(&local->iflist_mtx);
1359         }
1360
1361         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1362             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1363                                                         ETH_ALEN) == 0)) {
1364                 struct ieee80211_channel_sw_ie *sw_elem =
1365                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1366                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1367                                                  bss, rx_status->mactime);
1368         }
1369 }
1370
1371
1372 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1373                                          struct sk_buff *skb)
1374 {
1375         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1376         struct ieee80211_if_managed *ifmgd;
1377         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1378         size_t baselen, len = skb->len;
1379         struct ieee802_11_elems elems;
1380
1381         ifmgd = &sdata->u.mgd;
1382
1383         ASSERT_MGD_MTX(ifmgd);
1384
1385         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1386                 return; /* ignore ProbeResp to foreign address */
1387
1388         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1389         if (baselen > len)
1390                 return;
1391
1392         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1393                                 &elems);
1394
1395         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1396
1397         if (ifmgd->associated &&
1398             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1399             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1400                             IEEE80211_STA_CONNECTION_POLL)) {
1401                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1402                                   IEEE80211_STA_BEACON_POLL);
1403                 mutex_lock(&sdata->local->iflist_mtx);
1404                 ieee80211_recalc_ps(sdata->local, -1);
1405                 mutex_unlock(&sdata->local->iflist_mtx);
1406
1407                 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1408                         return;
1409
1410                 /*
1411                  * We've received a probe response, but are not sure whether
1412                  * we have or will be receiving any beacons or data, so let's
1413                  * schedule the timers again, just in case.
1414                  */
1415                 mod_beacon_timer(sdata);
1416
1417                 mod_timer(&ifmgd->conn_mon_timer,
1418                           round_jiffies_up(jiffies +
1419                                            IEEE80211_CONNECTION_IDLE_TIME));
1420         }
1421 }
1422
1423 /*
1424  * This is the canonical list of information elements we care about,
1425  * the filter code also gives us all changes to the Microsoft OUI
1426  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1427  *
1428  * We implement beacon filtering in software since that means we can
1429  * avoid processing the frame here and in cfg80211, and userspace
1430  * will not be able to tell whether the hardware supports it or not.
1431  *
1432  * XXX: This list needs to be dynamic -- userspace needs to be able to
1433  *      add items it requires. It also needs to be able to tell us to
1434  *      look out for other vendor IEs.
1435  */
1436 static const u64 care_about_ies =
1437         (1ULL << WLAN_EID_COUNTRY) |
1438         (1ULL << WLAN_EID_ERP_INFO) |
1439         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1440         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1441         (1ULL << WLAN_EID_HT_CAPABILITY) |
1442         (1ULL << WLAN_EID_HT_INFORMATION);
1443
1444 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1445                                      struct ieee80211_mgmt *mgmt,
1446                                      size_t len,
1447                                      struct ieee80211_rx_status *rx_status)
1448 {
1449         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1450         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1451         size_t baselen;
1452         struct ieee802_11_elems elems;
1453         struct ieee80211_local *local = sdata->local;
1454         u32 changed = 0;
1455         bool erp_valid, directed_tim = false;
1456         u8 erp_value = 0;
1457         u32 ncrc;
1458         u8 *bssid;
1459
1460         ASSERT_MGD_MTX(ifmgd);
1461
1462         /* Process beacon from the current BSS */
1463         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1464         if (baselen > len)
1465                 return;
1466
1467         if (rx_status->freq != local->hw.conf.channel->center_freq)
1468                 return;
1469
1470         /*
1471          * We might have received a number of frames, among them a
1472          * disassoc frame and a beacon...
1473          */
1474         if (!ifmgd->associated)
1475                 return;
1476
1477         bssid = ifmgd->associated->bssid;
1478
1479         /*
1480          * And in theory even frames from a different AP we were just
1481          * associated to a split-second ago!
1482          */
1483         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1484                 return;
1485
1486         /* Track average RSSI from the Beacon frames of the current AP */
1487         ifmgd->last_beacon_signal = rx_status->signal;
1488         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1489                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1490                 ifmgd->ave_beacon_signal = rx_status->signal;
1491                 ifmgd->last_cqm_event_signal = 0;
1492         } else {
1493                 ifmgd->ave_beacon_signal =
1494                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1495                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1496                          ifmgd->ave_beacon_signal) / 16;
1497         }
1498         if (bss_conf->cqm_rssi_thold &&
1499             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1500                 int sig = ifmgd->ave_beacon_signal / 16;
1501                 int last_event = ifmgd->last_cqm_event_signal;
1502                 int thold = bss_conf->cqm_rssi_thold;
1503                 int hyst = bss_conf->cqm_rssi_hyst;
1504                 if (sig < thold &&
1505                     (last_event == 0 || sig < last_event - hyst)) {
1506                         ifmgd->last_cqm_event_signal = sig;
1507                         ieee80211_cqm_rssi_notify(
1508                                 &sdata->vif,
1509                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1510                                 GFP_KERNEL);
1511                 } else if (sig > thold &&
1512                            (last_event == 0 || sig > last_event + hyst)) {
1513                         ifmgd->last_cqm_event_signal = sig;
1514                         ieee80211_cqm_rssi_notify(
1515                                 &sdata->vif,
1516                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1517                                 GFP_KERNEL);
1518                 }
1519         }
1520
1521         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1522 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1523                 if (net_ratelimit()) {
1524                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1525                                "to a received beacon\n", sdata->name);
1526                 }
1527 #endif
1528                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1529                 mutex_lock(&local->iflist_mtx);
1530                 ieee80211_recalc_ps(local, -1);
1531                 mutex_unlock(&local->iflist_mtx);
1532         }
1533
1534         /*
1535          * Push the beacon loss detection into the future since
1536          * we are processing a beacon from the AP just now.
1537          */
1538         mod_beacon_timer(sdata);
1539
1540         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1541         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1542                                           len - baselen, &elems,
1543                                           care_about_ies, ncrc);
1544
1545         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1546                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1547                                                    ifmgd->aid);
1548
1549         if (ncrc != ifmgd->beacon_crc) {
1550                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1551                                       true);
1552
1553                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1554                                          elems.wmm_param_len);
1555         }
1556
1557         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1558                 if (directed_tim) {
1559                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1560                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1561                                 ieee80211_hw_config(local,
1562                                                     IEEE80211_CONF_CHANGE_PS);
1563                                 ieee80211_send_nullfunc(local, sdata, 0);
1564                         } else {
1565                                 local->pspolling = true;
1566
1567                                 /*
1568                                  * Here is assumed that the driver will be
1569                                  * able to send ps-poll frame and receive a
1570                                  * response even though power save mode is
1571                                  * enabled, but some drivers might require
1572                                  * to disable power save here. This needs
1573                                  * to be investigated.
1574                                  */
1575                                 ieee80211_send_pspoll(local, sdata);
1576                         }
1577                 }
1578         }
1579
1580         if (ncrc == ifmgd->beacon_crc)
1581                 return;
1582         ifmgd->beacon_crc = ncrc;
1583
1584         if (elems.erp_info && elems.erp_info_len >= 1) {
1585                 erp_valid = true;
1586                 erp_value = elems.erp_info[0];
1587         } else {
1588                 erp_valid = false;
1589         }
1590         changed |= ieee80211_handle_bss_capability(sdata,
1591                         le16_to_cpu(mgmt->u.beacon.capab_info),
1592                         erp_valid, erp_value);
1593
1594
1595         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1596             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1597                 struct sta_info *sta;
1598                 struct ieee80211_supported_band *sband;
1599                 u16 ap_ht_cap_flags;
1600
1601                 rcu_read_lock();
1602
1603                 sta = sta_info_get(sdata, bssid);
1604                 if (WARN_ON(!sta)) {
1605                         rcu_read_unlock();
1606                         return;
1607                 }
1608
1609                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1610
1611                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1612                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1613
1614                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1615
1616                 rcu_read_unlock();
1617
1618                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1619                                                bssid, ap_ht_cap_flags);
1620         }
1621
1622         /* Note: country IE parsing is done for us by cfg80211 */
1623         if (elems.country_elem) {
1624                 /* TODO: IBSS also needs this */
1625                 if (elems.pwr_constr_elem)
1626                         ieee80211_handle_pwr_constr(sdata,
1627                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1628                                 elems.pwr_constr_elem,
1629                                 elems.pwr_constr_elem_len);
1630         }
1631
1632         ieee80211_bss_info_change_notify(sdata, changed);
1633 }
1634
1635 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1636                                           struct sk_buff *skb)
1637 {
1638         struct ieee80211_local *local = sdata->local;
1639         struct ieee80211_mgmt *mgmt;
1640         u16 fc;
1641
1642         if (skb->len < 24)
1643                 return RX_DROP_MONITOR;
1644
1645         mgmt = (struct ieee80211_mgmt *) skb->data;
1646         fc = le16_to_cpu(mgmt->frame_control);
1647
1648         switch (fc & IEEE80211_FCTL_STYPE) {
1649         case IEEE80211_STYPE_PROBE_RESP:
1650         case IEEE80211_STYPE_BEACON:
1651         case IEEE80211_STYPE_DEAUTH:
1652         case IEEE80211_STYPE_DISASSOC:
1653         case IEEE80211_STYPE_ACTION:
1654                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1655                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1656                 return RX_QUEUED;
1657         }
1658
1659         return RX_DROP_MONITOR;
1660 }
1661
1662 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1663                                          struct sk_buff *skb)
1664 {
1665         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1666         struct ieee80211_rx_status *rx_status;
1667         struct ieee80211_mgmt *mgmt;
1668         enum rx_mgmt_action rma = RX_MGMT_NONE;
1669         u16 fc;
1670
1671         rx_status = (struct ieee80211_rx_status *) skb->cb;
1672         mgmt = (struct ieee80211_mgmt *) skb->data;
1673         fc = le16_to_cpu(mgmt->frame_control);
1674
1675         mutex_lock(&ifmgd->mtx);
1676
1677         if (ifmgd->associated &&
1678             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1679                 switch (fc & IEEE80211_FCTL_STYPE) {
1680                 case IEEE80211_STYPE_BEACON:
1681                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1682                                                  rx_status);
1683                         break;
1684                 case IEEE80211_STYPE_PROBE_RESP:
1685                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1686                         break;
1687                 case IEEE80211_STYPE_DEAUTH:
1688                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1689                         break;
1690                 case IEEE80211_STYPE_DISASSOC:
1691                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1692                         break;
1693                 case IEEE80211_STYPE_ACTION:
1694                         if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1695                                 break;
1696
1697                         ieee80211_sta_process_chanswitch(sdata,
1698                                         &mgmt->u.action.u.chan_switch.sw_elem,
1699                                         (void *)ifmgd->associated->priv,
1700                                         rx_status->mactime);
1701                         break;
1702                 }
1703                 mutex_unlock(&ifmgd->mtx);
1704
1705                 switch (rma) {
1706                 case RX_MGMT_NONE:
1707                         /* no action */
1708                         break;
1709                 case RX_MGMT_CFG80211_DEAUTH:
1710                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1711                         break;
1712                 case RX_MGMT_CFG80211_DISASSOC:
1713                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1714                         break;
1715                 default:
1716                         WARN(1, "unexpected: %d", rma);
1717                 }
1718                 goto out;
1719         }
1720
1721         mutex_unlock(&ifmgd->mtx);
1722
1723         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1724             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1725                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1726
1727  out:
1728         kfree_skb(skb);
1729 }
1730
1731 static void ieee80211_sta_timer(unsigned long data)
1732 {
1733         struct ieee80211_sub_if_data *sdata =
1734                 (struct ieee80211_sub_if_data *) data;
1735         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1736         struct ieee80211_local *local = sdata->local;
1737
1738         if (local->quiescing) {
1739                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1740                 return;
1741         }
1742
1743         ieee80211_queue_work(&local->hw, &ifmgd->work);
1744 }
1745
1746 static void ieee80211_sta_work(struct work_struct *work)
1747 {
1748         struct ieee80211_sub_if_data *sdata =
1749                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1750         struct ieee80211_local *local = sdata->local;
1751         struct ieee80211_if_managed *ifmgd;
1752         struct sk_buff *skb;
1753
1754         if (!ieee80211_sdata_running(sdata))
1755                 return;
1756
1757         if (local->scanning)
1758                 return;
1759
1760         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1761                 return;
1762
1763         /*
1764          * ieee80211_queue_work() should have picked up most cases,
1765          * here we'll pick the the rest.
1766          */
1767         if (WARN(local->suspended, "STA MLME work scheduled while "
1768                  "going to suspend\n"))
1769                 return;
1770
1771         ifmgd = &sdata->u.mgd;
1772
1773         /* first process frames to avoid timing out while a frame is pending */
1774         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1775                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1776
1777         /* then process the rest of the work */
1778         mutex_lock(&ifmgd->mtx);
1779
1780         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1781                             IEEE80211_STA_CONNECTION_POLL) &&
1782             ifmgd->associated) {
1783                 u8 bssid[ETH_ALEN];
1784
1785                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1786                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1787                         run_again(ifmgd, ifmgd->probe_timeout);
1788
1789                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1790 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1791                         printk(KERN_DEBUG "No probe response from AP %pM"
1792                                 " after %dms, try %d\n", bssid,
1793                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1794                                 ifmgd->probe_send_count);
1795 #endif
1796                         ieee80211_mgd_probe_ap_send(sdata);
1797                 } else {
1798                         /*
1799                          * We actually lost the connection ... or did we?
1800                          * Let's make sure!
1801                          */
1802                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1803                                           IEEE80211_STA_BEACON_POLL);
1804                         printk(KERN_DEBUG "No probe response from AP %pM"
1805                                 " after %dms, disconnecting.\n",
1806                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1807                         ieee80211_set_disassoc(sdata, true);
1808                         ieee80211_recalc_idle(local);
1809                         mutex_unlock(&ifmgd->mtx);
1810                         /*
1811                          * must be outside lock due to cfg80211,
1812                          * but that's not a problem.
1813                          */
1814                         ieee80211_send_deauth_disassoc(sdata, bssid,
1815                                         IEEE80211_STYPE_DEAUTH,
1816                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1817                                         NULL, true);
1818                         mutex_lock(&ifmgd->mtx);
1819                 }
1820         }
1821
1822         mutex_unlock(&ifmgd->mtx);
1823 }
1824
1825 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1826 {
1827         struct ieee80211_sub_if_data *sdata =
1828                 (struct ieee80211_sub_if_data *) data;
1829         struct ieee80211_local *local = sdata->local;
1830
1831         if (local->quiescing)
1832                 return;
1833
1834         ieee80211_queue_work(&sdata->local->hw,
1835                              &sdata->u.mgd.beacon_connection_loss_work);
1836 }
1837
1838 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1839 {
1840         struct ieee80211_sub_if_data *sdata =
1841                 (struct ieee80211_sub_if_data *) data;
1842         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1843         struct ieee80211_local *local = sdata->local;
1844
1845         if (local->quiescing)
1846                 return;
1847
1848         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1849 }
1850
1851 static void ieee80211_sta_monitor_work(struct work_struct *work)
1852 {
1853         struct ieee80211_sub_if_data *sdata =
1854                 container_of(work, struct ieee80211_sub_if_data,
1855                              u.mgd.monitor_work);
1856
1857         ieee80211_mgd_probe_ap(sdata, false);
1858 }
1859
1860 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1861 {
1862         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1863                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1864                                         IEEE80211_STA_CONNECTION_POLL);
1865
1866                 /* let's probe the connection once */
1867                 ieee80211_queue_work(&sdata->local->hw,
1868                            &sdata->u.mgd.monitor_work);
1869                 /* and do all the other regular work too */
1870                 ieee80211_queue_work(&sdata->local->hw,
1871                            &sdata->u.mgd.work);
1872         }
1873 }
1874
1875 #ifdef CONFIG_PM
1876 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1877 {
1878         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1879
1880         /*
1881          * we need to use atomic bitops for the running bits
1882          * only because both timers might fire at the same
1883          * time -- the code here is properly synchronised.
1884          */
1885
1886         cancel_work_sync(&ifmgd->work);
1887         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1888         if (del_timer_sync(&ifmgd->timer))
1889                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1890
1891         cancel_work_sync(&ifmgd->chswitch_work);
1892         if (del_timer_sync(&ifmgd->chswitch_timer))
1893                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1894
1895         cancel_work_sync(&ifmgd->monitor_work);
1896         /* these will just be re-established on connection */
1897         del_timer_sync(&ifmgd->conn_mon_timer);
1898         del_timer_sync(&ifmgd->bcn_mon_timer);
1899 }
1900
1901 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1902 {
1903         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1904
1905         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1906                 add_timer(&ifmgd->timer);
1907         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1908                 add_timer(&ifmgd->chswitch_timer);
1909 }
1910 #endif
1911
1912 /* interface setup */
1913 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1914 {
1915         struct ieee80211_if_managed *ifmgd;
1916
1917         ifmgd = &sdata->u.mgd;
1918         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1919         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1920         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1921         INIT_WORK(&ifmgd->beacon_connection_loss_work,
1922                   ieee80211_beacon_connection_loss_work);
1923         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1924                     (unsigned long) sdata);
1925         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1926                     (unsigned long) sdata);
1927         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1928                     (unsigned long) sdata);
1929         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1930                     (unsigned long) sdata);
1931         skb_queue_head_init(&ifmgd->skb_queue);
1932
1933         ifmgd->flags = 0;
1934
1935         mutex_init(&ifmgd->mtx);
1936
1937         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1938                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1939         else
1940                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1941 }
1942
1943 /* scan finished notification */
1944 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1945 {
1946         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1947
1948         /* Restart STA timers */
1949         rcu_read_lock();
1950         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1951                 ieee80211_restart_sta_timer(sdata);
1952         rcu_read_unlock();
1953 }
1954
1955 int ieee80211_max_network_latency(struct notifier_block *nb,
1956                                   unsigned long data, void *dummy)
1957 {
1958         s32 latency_usec = (s32) data;
1959         struct ieee80211_local *local =
1960                 container_of(nb, struct ieee80211_local,
1961                              network_latency_notifier);
1962
1963         mutex_lock(&local->iflist_mtx);
1964         ieee80211_recalc_ps(local, latency_usec);
1965         mutex_unlock(&local->iflist_mtx);
1966
1967         return 0;
1968 }
1969
1970 /* config hooks */
1971 static enum work_done_result
1972 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1973                           struct sk_buff *skb)
1974 {
1975         if (!skb) {
1976                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1977                 return WORK_DONE_DESTROY;
1978         }
1979
1980         if (wk->type == IEEE80211_WORK_AUTH) {
1981                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1982                 return WORK_DONE_DESTROY;
1983         }
1984
1985         mutex_lock(&wk->sdata->u.mgd.mtx);
1986         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1987         mutex_unlock(&wk->sdata->u.mgd.mtx);
1988
1989         wk->type = IEEE80211_WORK_AUTH;
1990         wk->probe_auth.tries = 0;
1991         return WORK_DONE_REQUEUE;
1992 }
1993
1994 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1995                        struct cfg80211_auth_request *req)
1996 {
1997         const u8 *ssid;
1998         struct ieee80211_work *wk;
1999         u16 auth_alg;
2000
2001         if (req->local_state_change)
2002                 return 0; /* no need to update mac80211 state */
2003
2004         switch (req->auth_type) {
2005         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2006                 auth_alg = WLAN_AUTH_OPEN;
2007                 break;
2008         case NL80211_AUTHTYPE_SHARED_KEY:
2009                 auth_alg = WLAN_AUTH_SHARED_KEY;
2010                 break;
2011         case NL80211_AUTHTYPE_FT:
2012                 auth_alg = WLAN_AUTH_FT;
2013                 break;
2014         case NL80211_AUTHTYPE_NETWORK_EAP:
2015                 auth_alg = WLAN_AUTH_LEAP;
2016                 break;
2017         default:
2018                 return -EOPNOTSUPP;
2019         }
2020
2021         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2022         if (!wk)
2023                 return -ENOMEM;
2024
2025         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2026
2027         if (req->ie && req->ie_len) {
2028                 memcpy(wk->ie, req->ie, req->ie_len);
2029                 wk->ie_len = req->ie_len;
2030         }
2031
2032         if (req->key && req->key_len) {
2033                 wk->probe_auth.key_len = req->key_len;
2034                 wk->probe_auth.key_idx = req->key_idx;
2035                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2036         }
2037
2038         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2039         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2040         wk->probe_auth.ssid_len = ssid[1];
2041
2042         wk->probe_auth.algorithm = auth_alg;
2043         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2044
2045         /* if we already have a probe, don't probe again */
2046         if (req->bss->proberesp_ies)
2047                 wk->type = IEEE80211_WORK_AUTH;
2048         else
2049                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2050         wk->chan = req->bss->channel;
2051         wk->sdata = sdata;
2052         wk->done = ieee80211_probe_auth_done;
2053
2054         ieee80211_add_work(wk);
2055         return 0;
2056 }
2057
2058 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2059                                                   struct sk_buff *skb)
2060 {
2061         struct ieee80211_mgmt *mgmt;
2062         u16 status;
2063
2064         if (!skb) {
2065                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2066                 return WORK_DONE_DESTROY;
2067         }
2068
2069         mgmt = (void *)skb->data;
2070         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2071
2072         if (status == WLAN_STATUS_SUCCESS) {
2073                 mutex_lock(&wk->sdata->u.mgd.mtx);
2074                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2075                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2076                         /* oops -- internal error -- send timeout for now */
2077                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2078                                                     wk->filter_ta);
2079                         return WORK_DONE_DESTROY;
2080                 }
2081                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2082         }
2083
2084         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2085         return WORK_DONE_DESTROY;
2086 }
2087
2088 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2089                         struct cfg80211_assoc_request *req)
2090 {
2091         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2092         struct ieee80211_bss *bss = (void *)req->bss->priv;
2093         struct ieee80211_work *wk;
2094         const u8 *ssid;
2095         int i;
2096
2097         mutex_lock(&ifmgd->mtx);
2098         if (ifmgd->associated) {
2099                 if (!req->prev_bssid ||
2100                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2101                            ETH_ALEN)) {
2102                         /*
2103                          * We are already associated and the request was not a
2104                          * reassociation request from the current BSS, so
2105                          * reject it.
2106                          */
2107                         mutex_unlock(&ifmgd->mtx);
2108                         return -EALREADY;
2109                 }
2110
2111                 /* Trying to reassociate - clear previous association state */
2112                 ieee80211_set_disassoc(sdata, true);
2113         }
2114         mutex_unlock(&ifmgd->mtx);
2115
2116         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2117         if (!wk)
2118                 return -ENOMEM;
2119
2120         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2121         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2122
2123         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2124                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2125                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2126                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2127                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2128
2129
2130         if (req->ie && req->ie_len) {
2131                 memcpy(wk->ie, req->ie, req->ie_len);
2132                 wk->ie_len = req->ie_len;
2133         } else
2134                 wk->ie_len = 0;
2135
2136         wk->assoc.bss = req->bss;
2137
2138         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2139
2140         /* new association always uses requested smps mode */
2141         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2142                 if (ifmgd->powersave)
2143                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2144                 else
2145                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2146         } else
2147                 ifmgd->ap_smps = ifmgd->req_smps;
2148
2149         wk->assoc.smps = ifmgd->ap_smps;
2150         /*
2151          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2152          * We still associate in non-HT mode (11a/b/g) if any one of these
2153          * ciphers is configured as pairwise.
2154          * We can set this to true for non-11n hardware, that'll be checked
2155          * separately along with the peer capabilities.
2156          */
2157         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2158         wk->assoc.capability = req->bss->capability;
2159         wk->assoc.wmm_used = bss->wmm_used;
2160         wk->assoc.supp_rates = bss->supp_rates;
2161         wk->assoc.supp_rates_len = bss->supp_rates_len;
2162         wk->assoc.ht_information_ie =
2163                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2164
2165         if (bss->wmm_used && bss->uapsd_supported &&
2166             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2167                 wk->assoc.uapsd_used = true;
2168                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2169         } else {
2170                 wk->assoc.uapsd_used = false;
2171                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2172         }
2173
2174         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2175         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2176         wk->assoc.ssid_len = ssid[1];
2177
2178         if (req->prev_bssid)
2179                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2180
2181         wk->type = IEEE80211_WORK_ASSOC;
2182         wk->chan = req->bss->channel;
2183         wk->sdata = sdata;
2184         wk->done = ieee80211_assoc_done;
2185
2186         if (req->use_mfp) {
2187                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2188                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2189         } else {
2190                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2191                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2192         }
2193
2194         if (req->crypto.control_port)
2195                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2196         else
2197                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2198
2199         ieee80211_add_work(wk);
2200         return 0;
2201 }
2202
2203 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2204                          struct cfg80211_deauth_request *req,
2205                          void *cookie)
2206 {
2207         struct ieee80211_local *local = sdata->local;
2208         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2209         struct ieee80211_work *wk;
2210         const u8 *bssid = req->bss->bssid;
2211
2212         mutex_lock(&ifmgd->mtx);
2213
2214         if (ifmgd->associated == req->bss) {
2215                 bssid = req->bss->bssid;
2216                 ieee80211_set_disassoc(sdata, true);
2217                 mutex_unlock(&ifmgd->mtx);
2218         } else {
2219                 bool not_auth_yet = false;
2220
2221                 mutex_unlock(&ifmgd->mtx);
2222
2223                 mutex_lock(&local->work_mtx);
2224                 list_for_each_entry(wk, &local->work_list, list) {
2225                         if (wk->sdata != sdata)
2226                                 continue;
2227
2228                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2229                             wk->type != IEEE80211_WORK_AUTH &&
2230                             wk->type != IEEE80211_WORK_ASSOC)
2231                                 continue;
2232
2233                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2234                                 continue;
2235
2236                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2237                         list_del_rcu(&wk->list);
2238                         free_work(wk);
2239                         break;
2240                 }
2241                 mutex_unlock(&local->work_mtx);
2242
2243                 /*
2244                  * If somebody requests authentication and we haven't
2245                  * sent out an auth frame yet there's no need to send
2246                  * out a deauth frame either. If the state was PROBE,
2247                  * then this is the case. If it's AUTH we have sent a
2248                  * frame, and if it's IDLE we have completed the auth
2249                  * process already.
2250                  */
2251                 if (not_auth_yet) {
2252                         __cfg80211_auth_canceled(sdata->dev, bssid);
2253                         return 0;
2254                 }
2255         }
2256
2257         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2258                sdata->name, bssid, req->reason_code);
2259
2260         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2261                                        req->reason_code, cookie,
2262                                        !req->local_state_change);
2263
2264         ieee80211_recalc_idle(sdata->local);
2265
2266         return 0;
2267 }
2268
2269 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2270                            struct cfg80211_disassoc_request *req,
2271                            void *cookie)
2272 {
2273         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2274         u8 bssid[ETH_ALEN];
2275
2276         mutex_lock(&ifmgd->mtx);
2277
2278         /*
2279          * cfg80211 should catch this ... but it's racy since
2280          * we can receive a disassoc frame, process it, hand it
2281          * to cfg80211 while that's in a locked section already
2282          * trying to tell us that the user wants to disconnect.
2283          */
2284         if (ifmgd->associated != req->bss) {
2285                 mutex_unlock(&ifmgd->mtx);
2286                 return -ENOLINK;
2287         }
2288
2289         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2290                sdata->name, req->bss->bssid, req->reason_code);
2291
2292         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2293         ieee80211_set_disassoc(sdata, false);
2294
2295         mutex_unlock(&ifmgd->mtx);
2296
2297         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2298                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2299                         cookie, !req->local_state_change);
2300         sta_info_destroy_addr(sdata, bssid);
2301
2302         ieee80211_recalc_idle(sdata->local);
2303
2304         return 0;
2305 }
2306
2307 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2308                          struct ieee80211_channel *chan,
2309                          enum nl80211_channel_type channel_type,
2310                          const u8 *buf, size_t len, u64 *cookie)
2311 {
2312         struct ieee80211_local *local = sdata->local;
2313         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2314         struct sk_buff *skb;
2315
2316         /* Check that we are on the requested channel for transmission */
2317         if ((chan != local->tmp_channel ||
2318              channel_type != local->tmp_channel_type) &&
2319             (chan != local->oper_channel ||
2320              channel_type != local->_oper_channel_type))
2321                 return -EBUSY;
2322
2323         skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2324         if (!skb)
2325                 return -ENOMEM;
2326         skb_reserve(skb, local->hw.extra_tx_headroom);
2327
2328         memcpy(skb_put(skb, len), buf, len);
2329
2330         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2331                 IEEE80211_SKB_CB(skb)->flags |=
2332                         IEEE80211_TX_INTFL_DONT_ENCRYPT;
2333         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2334                 IEEE80211_TX_CTL_REQ_TX_STATUS;
2335         skb->dev = sdata->dev;
2336         ieee80211_tx_skb(sdata, skb);
2337
2338         *cookie = (unsigned long) skb;
2339         return 0;
2340 }
2341
2342 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2343                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2344                                gfp_t gfp)
2345 {
2346         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2347
2348         trace_api_cqm_rssi_notify(sdata, rssi_event);
2349
2350         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2351 }
2352 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);