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