net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/pm_qos_params.h>
  21 #include <linux/crc32.h>
  22 #include <linux/slab.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "driver-ops.h"
  28 #include "rate.h"
  29 #include "led.h"
  30
  31 #define IEEE80211_MAX_PROBE_TRIES 5
  32
  33 /*
  34  * beacon loss detection timeout
  35  * XXX: should depend on beacon interval
  36  */
  37 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
  38 /*
  39  * Time the connection can be idle before we probe
  40  * it to see if we can still talk to the AP.
  41  */
  42 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  43 /*
  44  * Time we wait for a probe response after sending
  45  * a probe request because of beacon loss or for
  46  * checking the connection still works.
  47  */
  48 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  49
  50 /*
  51  * Weight given to the latest Beacon frame when calculating average signal
  52  * strength for Beacon frames received in the current BSS. This must be
  53  * between 1 and 15.
  54  */
  55 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  56
  57 #define TMR_RUNNING_TIMER       0
  58 #define TMR_RUNNING_CHANSW      1
  59
  60 /*
  61  * All cfg80211 functions have to be called outside a locked
  62  * section so that they can acquire a lock themselves... This
  63  * is much simpler than queuing up things in cfg80211, but we
  64  * do need some indirection for that here.
  65  */
  66 enum rx_mgmt_action {
  67         /* no action required */
  68         RX_MGMT_NONE,
  69
  70         /* caller must call cfg80211_send_rx_auth() */
  71         RX_MGMT_CFG80211_AUTH,
  72
  73         /* caller must call cfg80211_send_rx_assoc() */
  74         RX_MGMT_CFG80211_ASSOC,
  75
  76         /* caller must call cfg80211_send_deauth() */
  77         RX_MGMT_CFG80211_DEAUTH,
  78
  79         /* caller must call cfg80211_send_disassoc() */
  80         RX_MGMT_CFG80211_DISASSOC,
  81
  82         /* caller must tell cfg80211 about internal error */
  83         RX_MGMT_CFG80211_ASSOC_ERROR,
  84 };
  85
  86 /* utils */
  87 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  88 {
  89         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  90 }
  91
  92 /*
  93  * We can have multiple work items (and connection probing)
  94  * scheduling this timer, but we need to take care to only
  95  * reschedule it when it should fire _earlier_ than it was
  96  * asked for before, or if it's not pending right now. This
  97  * function ensures that. Note that it then is required to
  98  * run this function for all timeouts after the first one
  99  * has happened -- the work that runs from this timer will
 100  * do that.
 101  */
 102 static void run_again(struct ieee80211_if_managed *ifmgd,
 103                              unsigned long timeout)
 104 {
 105         ASSERT_MGD_MTX(ifmgd);
 106
 107         if (!timer_pending(&ifmgd->timer) ||
 108             time_before(timeout, ifmgd->timer.expires))
 109                 mod_timer(&ifmgd->timer, timeout);
 110 }
 111
 112 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 113 {
 114         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 115                 return;
 116
 117         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 118                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 119 }
 120
 121 static int ecw2cw(int ecw)
 122 {
 123         return (1 << ecw) - 1;
 124 }
 125
 126 /*
 127  * ieee80211_enable_ht should be called only after the operating band
 128  * has been determined as ht configuration depends on the hw's
 129  * HT abilities for a specific band.
 130  */
 131 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 132                                struct ieee80211_ht_info *hti,
 133                                const u8 *bssid, u16 ap_ht_cap_flags)
 134 {
 135         struct ieee80211_local *local = sdata->local;
 136         struct ieee80211_supported_band *sband;
 137         struct sta_info *sta;
 138         u32 changed = 0;
 139         u16 ht_opmode;
 140         bool enable_ht = true;
 141         enum nl80211_channel_type prev_chantype;
 142         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 143
 144         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 145
 146         prev_chantype = sdata->vif.bss_conf.channel_type;
 147
 148         /* HT is not supported */
 149         if (!sband->ht_cap.ht_supported)
 150                 enable_ht = false;
 151
 152         /* check that channel matches the right operating channel */
 153         if (local->hw.conf.channel->center_freq !=
 154             ieee80211_channel_to_frequency(hti->control_chan))
 155                 enable_ht = false;
 156
 157         if (enable_ht) {
 158                 channel_type = NL80211_CHAN_HT20;
 159
 160                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 161                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 162                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 163                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 164                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 165                                 if (!(local->hw.conf.channel->flags &
 166                                     IEEE80211_CHAN_NO_HT40PLUS))
 167                                         channel_type = NL80211_CHAN_HT40PLUS;
 168                                 break;
 169                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 170                                 if (!(local->hw.conf.channel->flags &
 171                                     IEEE80211_CHAN_NO_HT40MINUS))
 172                                         channel_type = NL80211_CHAN_HT40MINUS;
 173                                 break;
 174                         }
 175                 }
 176         }
 177
 178         if (local->tmp_channel)
 179                 local->tmp_channel_type = channel_type;
 180
 181         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 182                 /* can only fail due to HT40+/- mismatch */
 183                 channel_type = NL80211_CHAN_HT20;
 184                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 185         }
 186
 187         /* channel_type change automatically detected */
 188         ieee80211_hw_config(local, 0);
 189
 190         if (prev_chantype != channel_type) {
 191                 rcu_read_lock();
 192                 sta = sta_info_get(sdata, bssid);
 193                 if (sta)
 194                         rate_control_rate_update(local, sband, sta,
 195                                                  IEEE80211_RC_HT_CHANGED,
 196                                                  channel_type);
 197                 rcu_read_unlock();
 198         }
 199
 200         ht_opmode = le16_to_cpu(hti->operation_mode);
 201
 202         /* if bss configuration changed store the new one */
 203         if (sdata->ht_opmode_valid != enable_ht ||
 204             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 205             prev_chantype != channel_type) {
 206                 changed |= BSS_CHANGED_HT;
 207                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 208                 sdata->ht_opmode_valid = enable_ht;
 209         }
 210
 211         return changed;
 212 }
 213
 214 /* frame sending functions */
 215
 216 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 217                                            const u8 *bssid, u16 stype, u16 reason,
 218                                            void *cookie, bool send_frame)
 219 {
 220         struct ieee80211_local *local = sdata->local;
 221         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 222         struct sk_buff *skb;
 223         struct ieee80211_mgmt *mgmt;
 224
 225         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 226         if (!skb) {
 227                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 228                        "deauth/disassoc frame\n", sdata->name);
 229                 return;
 230         }
 231         skb_reserve(skb, local->hw.extra_tx_headroom);
 232
 233         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 234         memset(mgmt, 0, 24);
 235         memcpy(mgmt->da, bssid, ETH_ALEN);
 236         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 237         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 238         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 239         skb_put(skb, 2);
 240         /* u.deauth.reason_code == u.disassoc.reason_code */
 241         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 242
 243         if (stype == IEEE80211_STYPE_DEAUTH)
 244                 if (cookie)
 245                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 246                 else
 247                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 248         else
 249                 if (cookie)
 250                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 251                 else
 252                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 253         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 254                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 255
 256         if (send_frame)
 257                 ieee80211_tx_skb(sdata, skb);
 258         else
 259                 kfree_skb(skb);
 260 }
 261
 262 void ieee80211_send_pspoll(struct ieee80211_local *local,
 263                            struct ieee80211_sub_if_data *sdata)
 264 {
 265         struct ieee80211_pspoll *pspoll;
 266         struct sk_buff *skb;
 267
 268         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 269         if (!skb)
 270                 return;
 271
 272         pspoll = (struct ieee80211_pspoll *) skb->data;
 273         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 274
 275         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 276         ieee80211_tx_skb(sdata, skb);
 277 }
 278
 279 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 280                              struct ieee80211_sub_if_data *sdata,
 281                              int powersave)
 282 {
 283         struct sk_buff *skb;
 284         struct ieee80211_hdr_3addr *nullfunc;
 285
 286         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 287         if (!skb)
 288                 return;
 289
 290         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 291         if (powersave)
 292                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 293
 294         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 295         ieee80211_tx_skb(sdata, skb);
 296 }
 297
 298 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 299                                           struct ieee80211_sub_if_data *sdata)
 300 {
 301         struct sk_buff *skb;
 302         struct ieee80211_hdr *nullfunc;
 303         __le16 fc;
 304
 305         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 306                 return;
 307
 308         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 309         if (!skb) {
 310                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 311                        "nullfunc frame\n", sdata->name);
 312                 return;
 313         }
 314         skb_reserve(skb, local->hw.extra_tx_headroom);
 315
 316         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 317         memset(nullfunc, 0, 30);
 318         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 319                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 320         nullfunc->frame_control = fc;
 321         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 322         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 323         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 324         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 325
 326         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 327         ieee80211_tx_skb(sdata, skb);
 328 }
 329
 330 /* spectrum management related things */
 331 static void ieee80211_chswitch_work(struct work_struct *work)
 332 {
 333         struct ieee80211_sub_if_data *sdata =
 334                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 335         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 336
 337         if (!ieee80211_sdata_running(sdata))
 338                 return;
 339
 340         mutex_lock(&ifmgd->mtx);
 341         if (!ifmgd->associated)
 342                 goto out;
 343
 344         sdata->local->oper_channel = sdata->local->csa_channel;
 345         if (!sdata->local->ops->channel_switch) {
 346                 /* call "hw_config" only if doing sw channel switch */
 347                 ieee80211_hw_config(sdata->local,
 348                         IEEE80211_CONF_CHANGE_CHANNEL);
 349         }
 350
 351         /* XXX: shouldn't really modify cfg80211-owned data! */
 352         ifmgd->associated->channel = sdata->local->oper_channel;
 353
 354         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 355                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 356  out:
 357         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 358         mutex_unlock(&ifmgd->mtx);
 359 }
 360
 361 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 362 {
 363         struct ieee80211_sub_if_data *sdata;
 364         struct ieee80211_if_managed *ifmgd;
 365
 366         sdata = vif_to_sdata(vif);
 367         ifmgd = &sdata->u.mgd;
 368
 369         trace_api_chswitch_done(sdata, success);
 370         if (!success) {
 371                 /*
 372                  * If the channel switch was not successful, stay
 373                  * around on the old channel. We currently lack
 374                  * good handling of this situation, possibly we
 375                  * should just drop the association.
 376                  */
 377                 sdata->local->csa_channel = sdata->local->oper_channel;
 378         }
 379
 380         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 381 }
 382 EXPORT_SYMBOL(ieee80211_chswitch_done);
 383
 384 static void ieee80211_chswitch_timer(unsigned long data)
 385 {
 386         struct ieee80211_sub_if_data *sdata =
 387                 (struct ieee80211_sub_if_data *) data;
 388         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 389
 390         if (sdata->local->quiescing) {
 391                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 392                 return;
 393         }
 394
 395         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 396 }
 397
 398 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 399                                       struct ieee80211_channel_sw_ie *sw_elem,
 400                                       struct ieee80211_bss *bss,
 401                                       u64 timestamp)
 402 {
 403         struct cfg80211_bss *cbss =
 404                 container_of((void *)bss, struct cfg80211_bss, priv);
 405         struct ieee80211_channel *new_ch;
 406         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 407         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 408
 409         ASSERT_MGD_MTX(ifmgd);
 410
 411         if (!ifmgd->associated)
 412                 return;
 413
 414         if (sdata->local->scanning)
 415                 return;
 416
 417         /* Disregard subsequent beacons if we are already running a timer
 418            processing a CSA */
 419
 420         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 421                 return;
 422
 423         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 424         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 425                 return;
 426
 427         sdata->local->csa_channel = new_ch;
 428
 429         if (sdata->local->ops->channel_switch) {
 430                 /* use driver's channel switch callback */
 431                 struct ieee80211_channel_switch ch_switch;
 432                 memset(&ch_switch, 0, sizeof(ch_switch));
 433                 ch_switch.timestamp = timestamp;
 434                 if (sw_elem->mode) {
 435                         ch_switch.block_tx = true;
 436                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 437                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 438                 }
 439                 ch_switch.channel = new_ch;
 440                 ch_switch.count = sw_elem->count;
 441                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 442                 drv_channel_switch(sdata->local, &ch_switch);
 443                 return;
 444         }
 445
 446         /* channel switch handled in software */
 447         if (sw_elem->count <= 1) {
 448                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 449         } else {
 450                 if (sw_elem->mode)
 451                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 452                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 453                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 454                 mod_timer(&ifmgd->chswitch_timer,
 455                           jiffies +
 456                           msecs_to_jiffies(sw_elem->count *
 457                                            cbss->beacon_interval));
 458         }
 459 }
 460
 461 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 462                                         u16 capab_info, u8 *pwr_constr_elem,
 463                                         u8 pwr_constr_elem_len)
 464 {
 465         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 466
 467         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 468                 return;
 469
 470         /* Power constraint IE length should be 1 octet */
 471         if (pwr_constr_elem_len != 1)
 472                 return;
 473
 474         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 475             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 476                 sdata->local->power_constr_level = *pwr_constr_elem;
 477                 ieee80211_hw_config(sdata->local, 0);
 478         }
 479 }
 480
 481 /* powersave */
 482 static void ieee80211_enable_ps(struct ieee80211_local *local,
 483                                 struct ieee80211_sub_if_data *sdata)
 484 {
 485         struct ieee80211_conf *conf = &local->hw.conf;
 486
 487         /*
 488          * If we are scanning right now then the parameters will
 489          * take effect when scan finishes.
 490          */
 491         if (local->scanning)
 492                 return;
 493
 494         if (conf->dynamic_ps_timeout > 0 &&
 495             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 496                 mod_timer(&local->dynamic_ps_timer, jiffies +
 497                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 498         } else {
 499                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 500                         ieee80211_send_nullfunc(local, sdata, 1);
 501
 502                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 503                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 504                         return;
 505
 506                 conf->flags |= IEEE80211_CONF_PS;
 507                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 508         }
 509 }
 510
 511 static void ieee80211_change_ps(struct ieee80211_local *local)
 512 {
 513         struct ieee80211_conf *conf = &local->hw.conf;
 514
 515         if (local->ps_sdata) {
 516                 ieee80211_enable_ps(local, local->ps_sdata);
 517         } else if (conf->flags & IEEE80211_CONF_PS) {
 518                 conf->flags &= ~IEEE80211_CONF_PS;
 519                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 520                 del_timer_sync(&local->dynamic_ps_timer);
 521                 cancel_work_sync(&local->dynamic_ps_enable_work);
 522         }
 523 }
 524
 525 /* need to hold RTNL or interface lock */
 526 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 527 {
 528         struct ieee80211_sub_if_data *sdata, *found = NULL;
 529         int count = 0;
 530         int timeout;
 531
 532         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 533                 local->ps_sdata = NULL;
 534                 return;
 535         }
 536
 537         if (!list_empty(&local->work_list)) {
 538                 local->ps_sdata = NULL;
 539                 goto change;
 540         }
 541
 542         list_for_each_entry(sdata, &local->interfaces, list) {
 543                 if (!ieee80211_sdata_running(sdata))
 544                         continue;
 545                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 546                         continue;
 547                 found = sdata;
 548                 count++;
 549         }
 550
 551         if (count == 1 && found->u.mgd.powersave &&
 552             found->u.mgd.associated &&
 553             found->u.mgd.associated->beacon_ies &&
 554             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 555                                     IEEE80211_STA_CONNECTION_POLL))) {
 556                 s32 beaconint_us;
 557
 558                 if (latency < 0)
 559                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 560
 561                 beaconint_us = ieee80211_tu_to_usec(
 562                                         found->vif.bss_conf.beacon_int);
 563
 564                 timeout = local->dynamic_ps_forced_timeout;
 565                 if (timeout < 0) {
 566                         /*
 567                          * Go to full PSM if the user configures a very low
 568                          * latency requirement.
 569                          * The 2 second value is there for compatibility until
 570                          * the PM_QOS_NETWORK_LATENCY is configured with real
 571                          * values.
 572                          */
 573                         if (latency > 1900000000 && latency != 2000000000)
 574                                 timeout = 0;
 575                         else
 576                                 timeout = 100;
 577                 }
 578                 local->hw.conf.dynamic_ps_timeout = timeout;
 579
 580                 if (beaconint_us > latency) {
 581                         local->ps_sdata = NULL;
 582                 } else {
 583                         struct ieee80211_bss *bss;
 584                         int maxslp = 1;
 585                         u8 dtimper;
 586
 587                         bss = (void *)found->u.mgd.associated->priv;
 588                         dtimper = bss->dtim_period;
 589
 590                         /* If the TIM IE is invalid, pretend the value is 1 */
 591                         if (!dtimper)
 592                                 dtimper = 1;
 593                         else if (dtimper > 1)
 594                                 maxslp = min_t(int, dtimper,
 595                                                     latency / beaconint_us);
 596
 597                         local->hw.conf.max_sleep_period = maxslp;
 598                         local->hw.conf.ps_dtim_period = dtimper;
 599                         local->ps_sdata = found;
 600                 }
 601         } else {
 602                 local->ps_sdata = NULL;
 603         }
 604
 605  change:
 606         ieee80211_change_ps(local);
 607 }
 608
 609 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 610 {
 611         struct ieee80211_local *local =
 612                 container_of(work, struct ieee80211_local,
 613                              dynamic_ps_disable_work);
 614
 615         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 616                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 617                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 618         }
 619
 620         ieee80211_wake_queues_by_reason(&local->hw,
 621                                         IEEE80211_QUEUE_STOP_REASON_PS);
 622 }
 623
 624 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 625 {
 626         struct ieee80211_local *local =
 627                 container_of(work, struct ieee80211_local,
 628                              dynamic_ps_enable_work);
 629         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 630         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 631
 632         /* can only happen when PS was just disabled anyway */
 633         if (!sdata)
 634                 return;
 635
 636         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 637                 return;
 638
 639         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 640             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 641                 ieee80211_send_nullfunc(local, sdata, 1);
 642
 643         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 644               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 645             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 646                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 647                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 648                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 649         }
 650 }
 651
 652 void ieee80211_dynamic_ps_timer(unsigned long data)
 653 {
 654         struct ieee80211_local *local = (void *) data;
 655
 656         if (local->quiescing || local->suspended)
 657                 return;
 658
 659         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 660 }
 661
 662 /* MLME */
 663 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 664                                      struct ieee80211_if_managed *ifmgd,
 665                                      u8 *wmm_param, size_t wmm_param_len)
 666 {
 667         struct ieee80211_tx_queue_params params;
 668         size_t left;
 669         int count;
 670         u8 *pos, uapsd_queues = 0;
 671
 672         if (!local->ops->conf_tx)
 673                 return;
 674
 675         if (local->hw.queues < 4)
 676                 return;
 677
 678         if (!wmm_param)
 679                 return;
 680
 681         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 682                 return;
 683
 684         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 685                 uapsd_queues = local->uapsd_queues;
 686
 687         count = wmm_param[6] & 0x0f;
 688         if (count == ifmgd->wmm_last_param_set)
 689                 return;
 690         ifmgd->wmm_last_param_set = count;
 691
 692         pos = wmm_param + 8;
 693         left = wmm_param_len - 8;
 694
 695         memset(&params, 0, sizeof(params));
 696
 697         local->wmm_acm = 0;
 698         for (; left >= 4; left -= 4, pos += 4) {
 699                 int aci = (pos[0] >> 5) & 0x03;
 700                 int acm = (pos[0] >> 4) & 0x01;
 701                 bool uapsd = false;
 702                 int queue;
 703
 704                 switch (aci) {
 705                 case 1: /* AC_BK */
 706                         queue = 3;
 707                         if (acm)
 708                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 709                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 710                                 uapsd = true;
 711                         break;
 712                 case 2: /* AC_VI */
 713                         queue = 1;
 714                         if (acm)
 715                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 716                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 717                                 uapsd = true;
 718                         break;
 719                 case 3: /* AC_VO */
 720                         queue = 0;
 721                         if (acm)
 722                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 723                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 724                                 uapsd = true;
 725                         break;
 726                 case 0: /* AC_BE */
 727                 default:
 728                         queue = 2;
 729                         if (acm)
 730                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 731                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 732                                 uapsd = true;
 733                         break;
 734                 }
 735
 736                 params.aifs = pos[0] & 0x0f;
 737                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 738                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 739                 params.txop = get_unaligned_le16(pos + 2);
 740                 params.uapsd = uapsd;
 741
 742 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 743                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 744                        "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 745                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 746                        params.aifs, params.cw_min, params.cw_max, params.txop,
 747                        params.uapsd);
 748 #endif
 749                 if (drv_conf_tx(local, queue, &params))
 750                         printk(KERN_DEBUG "%s: failed to set TX queue "
 751                                "parameters for queue %d\n",
 752                                wiphy_name(local->hw.wiphy), queue);
 753         }
 754
 755         /* enable WMM or activate new settings */
 756         local->hw.conf.flags |= IEEE80211_CONF_QOS;
 757         drv_config(local, IEEE80211_CONF_CHANGE_QOS);
 758 }
 759
 760 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 761                                            u16 capab, bool erp_valid, u8 erp)
 762 {
 763         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 764         u32 changed = 0;
 765         bool use_protection;
 766         bool use_short_preamble;
 767         bool use_short_slot;
 768
 769         if (erp_valid) {
 770                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 771                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 772         } else {
 773                 use_protection = false;
 774                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 775         }
 776
 777         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 778         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 779                 use_short_slot = true;
 780
 781         if (use_protection != bss_conf->use_cts_prot) {
 782                 bss_conf->use_cts_prot = use_protection;
 783                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 784         }
 785
 786         if (use_short_preamble != bss_conf->use_short_preamble) {
 787                 bss_conf->use_short_preamble = use_short_preamble;
 788                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 789         }
 790
 791         if (use_short_slot != bss_conf->use_short_slot) {
 792                 bss_conf->use_short_slot = use_short_slot;
 793                 changed |= BSS_CHANGED_ERP_SLOT;
 794         }
 795
 796         return changed;
 797 }
 798
 799 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 800                                      struct cfg80211_bss *cbss,
 801                                      u32 bss_info_changed)
 802 {
 803         struct ieee80211_bss *bss = (void *)cbss->priv;
 804         struct ieee80211_local *local = sdata->local;
 805         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 806
 807         bss_info_changed |= BSS_CHANGED_ASSOC;
 808         /* set timing information */
 809         bss_conf->beacon_int = cbss->beacon_interval;
 810         bss_conf->timestamp = cbss->tsf;
 811
 812         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 813         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 814                 cbss->capability, bss->has_erp_value, bss->erp_value);
 815
 816         sdata->u.mgd.associated = cbss;
 817         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 818
 819         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 820
 821         /* just to be sure */
 822         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 823                                 IEEE80211_STA_BEACON_POLL);
 824
 825         /*
 826          * Always handle WMM once after association regardless
 827          * of the first value the AP uses. Setting -1 here has
 828          * that effect because the AP values is an unsigned
 829          * 4-bit value.
 830          */
 831         sdata->u.mgd.wmm_last_param_set = -1;
 832
 833         ieee80211_led_assoc(local, 1);
 834
 835         bss_conf->assoc = 1;
 836         /*
 837          * For now just always ask the driver to update the basic rateset
 838          * when we have associated, we aren't checking whether it actually
 839          * changed or not.
 840          */
 841         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 842
 843         /* And the BSSID changed - we're associated now */
 844         bss_info_changed |= BSS_CHANGED_BSSID;
 845
 846         /* Tell the driver to monitor connection quality (if supported) */
 847         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 848             bss_conf->cqm_rssi_thold)
 849                 bss_info_changed |= BSS_CHANGED_CQM;
 850
 851         /* Enable ARP filtering */
 852         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
 853                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 854                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
 855         }
 856
 857         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 858
 859         mutex_lock(&local->iflist_mtx);
 860         ieee80211_recalc_ps(local, -1);
 861         ieee80211_recalc_smps(local, sdata);
 862         mutex_unlock(&local->iflist_mtx);
 863
 864         netif_tx_start_all_queues(sdata->dev);
 865         netif_carrier_on(sdata->dev);
 866 }
 867
 868 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 869                                    bool remove_sta)
 870 {
 871         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 872         struct ieee80211_local *local = sdata->local;
 873         struct sta_info *sta;
 874         u32 changed = 0, config_changed = 0;
 875         u8 bssid[ETH_ALEN];
 876
 877         ASSERT_MGD_MTX(ifmgd);
 878
 879         if (WARN_ON(!ifmgd->associated))
 880                 return;
 881
 882         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 883
 884         ifmgd->associated = NULL;
 885         memset(ifmgd->bssid, 0, ETH_ALEN);
 886
 887         /*
 888          * we need to commit the associated = NULL change because the
 889          * scan code uses that to determine whether this iface should
 890          * go to/wake up from powersave or not -- and could otherwise
 891          * wake the queues erroneously.
 892          */
 893         smp_mb();
 894
 895         /*
 896          * Thus, we can only afterwards stop the queues -- to account
 897          * for the case where another CPU is finishing a scan at this
 898          * time -- we don't want the scan code to enable queues.
 899          */
 900
 901         netif_tx_stop_all_queues(sdata->dev);
 902         netif_carrier_off(sdata->dev);
 903
 904         mutex_lock(&local->sta_mtx);
 905         sta = sta_info_get(sdata, bssid);
 906         if (sta) {
 907                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
 908                 ieee80211_sta_tear_down_BA_sessions(sta);
 909         }
 910         mutex_unlock(&local->sta_mtx);
 911
 912         changed |= ieee80211_reset_erp_info(sdata);
 913
 914         ieee80211_led_assoc(local, 0);
 915         changed |= BSS_CHANGED_ASSOC;
 916         sdata->vif.bss_conf.assoc = false;
 917
 918         ieee80211_set_wmm_default(sdata);
 919
 920         /* channel(_type) changes are handled by ieee80211_hw_config */
 921         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
 922
 923         /* on the next assoc, re-program HT parameters */
 924         sdata->ht_opmode_valid = false;
 925
 926         local->power_constr_level = 0;
 927
 928         del_timer_sync(&local->dynamic_ps_timer);
 929         cancel_work_sync(&local->dynamic_ps_enable_work);
 930
 931         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 932                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 933                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 934         }
 935
 936         ieee80211_hw_config(local, config_changed);
 937
 938         /* Disable ARP filtering */
 939         if (sdata->vif.bss_conf.arp_filter_enabled) {
 940                 sdata->vif.bss_conf.arp_filter_enabled = false;
 941                 changed |= BSS_CHANGED_ARP_FILTER;
 942         }
 943
 944         /* The BSSID (not really interesting) and HT changed */
 945         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
 946         ieee80211_bss_info_change_notify(sdata, changed);
 947
 948         if (remove_sta)
 949                 sta_info_destroy_addr(sdata, bssid);
 950 }
 951
 952 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 953                              struct ieee80211_hdr *hdr)
 954 {
 955         /*
 956          * We can postpone the mgd.timer whenever receiving unicast frames
 957          * from AP because we know that the connection is working both ways
 958          * at that time. But multicast frames (and hence also beacons) must
 959          * be ignored here, because we need to trigger the timer during
 960          * data idle periods for sending the periodic probe request to the
 961          * AP we're connected to.
 962          */
 963         if (is_multicast_ether_addr(hdr->addr1))
 964                 return;
 965
 966         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 967                 return;
 968
 969         mod_timer(&sdata->u.mgd.conn_mon_timer,
 970                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 971 }
 972
 973 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
 974 {
 975         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 976         const u8 *ssid;
 977
 978         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
 979         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
 980                                  ssid + 2, ssid[1], NULL, 0);
 981
 982         ifmgd->probe_send_count++;
 983         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
 984         run_again(ifmgd, ifmgd->probe_timeout);
 985 }
 986
 987 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
 988                                    bool beacon)
 989 {
 990         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 991         bool already = false;
 992
 993         if (!ieee80211_sdata_running(sdata))
 994                 return;
 995
 996         if (sdata->local->scanning)
 997                 return;
 998
 999         if (sdata->local->tmp_channel)
1000                 return;
1001
1002         mutex_lock(&ifmgd->mtx);
1003
1004         if (!ifmgd->associated)
1005                 goto out;
1006
1007 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1008         if (beacon && net_ratelimit())
1009                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1010                        "- sending probe request\n", sdata->name);
1011 #endif
1012
1013         /*
1014          * The driver/our work has already reported this event or the
1015          * connection monitoring has kicked in and we have already sent
1016          * a probe request. Or maybe the AP died and the driver keeps
1017          * reporting until we disassociate...
1018          *
1019          * In either case we have to ignore the current call to this
1020          * function (except for setting the correct probe reason bit)
1021          * because otherwise we would reset the timer every time and
1022          * never check whether we received a probe response!
1023          */
1024         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1025                             IEEE80211_STA_CONNECTION_POLL))
1026                 already = true;
1027
1028         if (beacon)
1029                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1030         else
1031                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1032
1033         if (already)
1034                 goto out;
1035
1036         mutex_lock(&sdata->local->iflist_mtx);
1037         ieee80211_recalc_ps(sdata->local, -1);
1038         mutex_unlock(&sdata->local->iflist_mtx);
1039
1040         ifmgd->probe_send_count = 0;
1041         ieee80211_mgd_probe_ap_send(sdata);
1042  out:
1043         mutex_unlock(&ifmgd->mtx);
1044 }
1045
1046 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1047 {
1048         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1049         struct ieee80211_local *local = sdata->local;
1050         u8 bssid[ETH_ALEN];
1051
1052         mutex_lock(&ifmgd->mtx);
1053         if (!ifmgd->associated) {
1054                 mutex_unlock(&ifmgd->mtx);
1055                 return;
1056         }
1057
1058         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1059
1060         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1061
1062         ieee80211_set_disassoc(sdata, true);
1063         ieee80211_recalc_idle(local);
1064         mutex_unlock(&ifmgd->mtx);
1065         /*
1066          * must be outside lock due to cfg80211,
1067          * but that's not a problem.
1068          */
1069         ieee80211_send_deauth_disassoc(sdata, bssid,
1070                                        IEEE80211_STYPE_DEAUTH,
1071                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1072                                        NULL, true);
1073 }
1074
1075 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1076 {
1077         struct ieee80211_sub_if_data *sdata =
1078                 container_of(work, struct ieee80211_sub_if_data,
1079                              u.mgd.beacon_connection_loss_work);
1080
1081         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1082                 __ieee80211_connection_loss(sdata);
1083         else
1084                 ieee80211_mgd_probe_ap(sdata, true);
1085 }
1086
1087 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1088 {
1089         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1090         struct ieee80211_hw *hw = &sdata->local->hw;
1091
1092         trace_api_beacon_loss(sdata);
1093
1094         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1095         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1096 }
1097 EXPORT_SYMBOL(ieee80211_beacon_loss);
1098
1099 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1100 {
1101         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1102         struct ieee80211_hw *hw = &sdata->local->hw;
1103
1104         trace_api_connection_loss(sdata);
1105
1106         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1107         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1108 }
1109 EXPORT_SYMBOL(ieee80211_connection_loss);
1110
1111
1112 static enum rx_mgmt_action __must_check
1113 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1114                          struct ieee80211_mgmt *mgmt, size_t len)
1115 {
1116         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1117         const u8 *bssid = NULL;
1118         u16 reason_code;
1119
1120         if (len < 24 + 2)
1121                 return RX_MGMT_NONE;
1122
1123         ASSERT_MGD_MTX(ifmgd);
1124
1125         bssid = ifmgd->associated->bssid;
1126
1127         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1128
1129         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1130                         sdata->name, bssid, reason_code);
1131
1132         ieee80211_set_disassoc(sdata, true);
1133         ieee80211_recalc_idle(sdata->local);
1134
1135         return RX_MGMT_CFG80211_DEAUTH;
1136 }
1137
1138
1139 static enum rx_mgmt_action __must_check
1140 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1141                            struct ieee80211_mgmt *mgmt, size_t len)
1142 {
1143         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1144         u16 reason_code;
1145
1146         if (len < 24 + 2)
1147                 return RX_MGMT_NONE;
1148
1149         ASSERT_MGD_MTX(ifmgd);
1150
1151         if (WARN_ON(!ifmgd->associated))
1152                 return RX_MGMT_NONE;
1153
1154         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1155                 return RX_MGMT_NONE;
1156
1157         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1158
1159         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1160                         sdata->name, mgmt->sa, reason_code);
1161
1162         ieee80211_set_disassoc(sdata, true);
1163         ieee80211_recalc_idle(sdata->local);
1164         return RX_MGMT_CFG80211_DISASSOC;
1165 }
1166
1167
1168 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1169                                     struct ieee80211_mgmt *mgmt, size_t len)
1170 {
1171         struct ieee80211_sub_if_data *sdata = wk->sdata;
1172         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1173         struct ieee80211_local *local = sdata->local;
1174         struct ieee80211_supported_band *sband;
1175         struct sta_info *sta;
1176         struct cfg80211_bss *cbss = wk->assoc.bss;
1177         u8 *pos;
1178         u32 rates, basic_rates;
1179         u16 capab_info, aid;
1180         struct ieee802_11_elems elems;
1181         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1182         u32 changed = 0;
1183         int i, j, err;
1184         bool have_higher_than_11mbit = false;
1185         u16 ap_ht_cap_flags;
1186
1187         /* AssocResp and ReassocResp have identical structure */
1188
1189         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1190         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1191
1192         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1193                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1194                        "set\n", sdata->name, aid);
1195         aid &= ~(BIT(15) | BIT(14));
1196
1197         pos = mgmt->u.assoc_resp.variable;
1198         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1199
1200         if (!elems.supp_rates) {
1201                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1202                        sdata->name);
1203                 return false;
1204         }
1205
1206         ifmgd->aid = aid;
1207
1208         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1209         if (!sta) {
1210                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1211                        " the AP\n", sdata->name);
1212                 return false;
1213         }
1214
1215         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1216                            WLAN_STA_ASSOC_AP);
1217         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1218                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1219
1220         rates = 0;
1221         basic_rates = 0;
1222         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1223
1224         for (i = 0; i < elems.supp_rates_len; i++) {
1225                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1226                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1227
1228                 if (rate > 110)
1229                         have_higher_than_11mbit = true;
1230
1231                 for (j = 0; j < sband->n_bitrates; j++) {
1232                         if (sband->bitrates[j].bitrate == rate) {
1233                                 rates |= BIT(j);
1234                                 if (is_basic)
1235                                         basic_rates |= BIT(j);
1236                                 break;
1237                         }
1238                 }
1239         }
1240
1241         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1242                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1243                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1244
1245                 if (rate > 110)
1246                         have_higher_than_11mbit = true;
1247
1248                 for (j = 0; j < sband->n_bitrates; j++) {
1249                         if (sband->bitrates[j].bitrate == rate) {
1250                                 rates |= BIT(j);
1251                                 if (is_basic)
1252                                         basic_rates |= BIT(j);
1253                                 break;
1254                         }
1255                 }
1256         }
1257
1258         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1259         sdata->vif.bss_conf.basic_rates = basic_rates;
1260
1261         /* cf. IEEE 802.11 9.2.12 */
1262         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1263             have_higher_than_11mbit)
1264                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1265         else
1266                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1267
1268         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1269                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1270                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1271
1272         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1273
1274         rate_control_rate_init(sta);
1275
1276         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1277                 set_sta_flags(sta, WLAN_STA_MFP);
1278
1279         if (elems.wmm_param)
1280                 set_sta_flags(sta, WLAN_STA_WME);
1281
1282         err = sta_info_insert(sta);
1283         sta = NULL;
1284         if (err) {
1285                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1286                        " the AP (error %d)\n", sdata->name, err);
1287                 return false;
1288         }
1289
1290         if (elems.wmm_param)
1291                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1292                                          elems.wmm_param_len);
1293         else
1294                 ieee80211_set_wmm_default(sdata);
1295
1296         local->oper_channel = wk->chan;
1297
1298         if (elems.ht_info_elem && elems.wmm_param &&
1299             (sdata->local->hw.queues >= 4) &&
1300             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1301                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1302                                                cbss->bssid, ap_ht_cap_flags);
1303
1304         /* set AID and assoc capability,
1305          * ieee80211_set_associated() will tell the driver */
1306         bss_conf->aid = aid;
1307         bss_conf->assoc_capability = capab_info;
1308         ieee80211_set_associated(sdata, cbss, changed);
1309
1310         /*
1311          * If we're using 4-addr mode, let the AP know that we're
1312          * doing so, so that it can create the STA VLAN on its side
1313          */
1314         if (ifmgd->use_4addr)
1315                 ieee80211_send_4addr_nullfunc(local, sdata);
1316
1317         /*
1318          * Start timer to probe the connection to the AP now.
1319          * Also start the timer that will detect beacon loss.
1320          */
1321         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1322         mod_beacon_timer(sdata);
1323
1324         return true;
1325 }
1326
1327
1328 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1329                                   struct ieee80211_mgmt *mgmt,
1330                                   size_t len,
1331                                   struct ieee80211_rx_status *rx_status,
1332                                   struct ieee802_11_elems *elems,
1333                                   bool beacon)
1334 {
1335         struct ieee80211_local *local = sdata->local;
1336         int freq;
1337         struct ieee80211_bss *bss;
1338         struct ieee80211_channel *channel;
1339         bool need_ps = false;
1340
1341         if (sdata->u.mgd.associated) {
1342                 bss = (void *)sdata->u.mgd.associated->priv;
1343                 /* not previously set so we may need to recalc */
1344                 need_ps = !bss->dtim_period;
1345         }
1346
1347         if (elems->ds_params && elems->ds_params_len == 1)
1348                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1349         else
1350                 freq = rx_status->freq;
1351
1352         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1353
1354         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1355                 return;
1356
1357         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1358                                         channel, beacon);
1359         if (bss)
1360                 ieee80211_rx_bss_put(local, bss);
1361
1362         if (!sdata->u.mgd.associated)
1363                 return;
1364
1365         if (need_ps) {
1366                 mutex_lock(&local->iflist_mtx);
1367                 ieee80211_recalc_ps(local, -1);
1368                 mutex_unlock(&local->iflist_mtx);
1369         }
1370
1371         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1372             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1373                                                         ETH_ALEN) == 0)) {
1374                 struct ieee80211_channel_sw_ie *sw_elem =
1375                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1376                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1377                                                  bss, rx_status->mactime);
1378         }
1379 }
1380
1381
1382 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1383                                          struct sk_buff *skb)
1384 {
1385         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1386         struct ieee80211_if_managed *ifmgd;
1387         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1388         size_t baselen, len = skb->len;
1389         struct ieee802_11_elems elems;
1390
1391         ifmgd = &sdata->u.mgd;
1392
1393         ASSERT_MGD_MTX(ifmgd);
1394
1395         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1396                 return; /* ignore ProbeResp to foreign address */
1397
1398         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1399         if (baselen > len)
1400                 return;
1401
1402         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1403                                 &elems);
1404
1405         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1406
1407         if (ifmgd->associated &&
1408             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1409             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1410                             IEEE80211_STA_CONNECTION_POLL)) {
1411                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1412                                   IEEE80211_STA_BEACON_POLL);
1413                 mutex_lock(&sdata->local->iflist_mtx);
1414                 ieee80211_recalc_ps(sdata->local, -1);
1415                 mutex_unlock(&sdata->local->iflist_mtx);
1416
1417                 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1418                         return;
1419
1420                 /*
1421                  * We've received a probe response, but are not sure whether
1422                  * we have or will be receiving any beacons or data, so let's
1423                  * schedule the timers again, just in case.
1424                  */
1425                 mod_beacon_timer(sdata);
1426
1427                 mod_timer(&ifmgd->conn_mon_timer,
1428                           round_jiffies_up(jiffies +
1429                                            IEEE80211_CONNECTION_IDLE_TIME));
1430         }
1431 }
1432
1433 /*
1434  * This is the canonical list of information elements we care about,
1435  * the filter code also gives us all changes to the Microsoft OUI
1436  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1437  *
1438  * We implement beacon filtering in software since that means we can
1439  * avoid processing the frame here and in cfg80211, and userspace
1440  * will not be able to tell whether the hardware supports it or not.
1441  *
1442  * XXX: This list needs to be dynamic -- userspace needs to be able to
1443  *      add items it requires. It also needs to be able to tell us to
1444  *      look out for other vendor IEs.
1445  */
1446 static const u64 care_about_ies =
1447         (1ULL << WLAN_EID_COUNTRY) |
1448         (1ULL << WLAN_EID_ERP_INFO) |
1449         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1450         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1451         (1ULL << WLAN_EID_HT_CAPABILITY) |
1452         (1ULL << WLAN_EID_HT_INFORMATION);
1453
1454 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1455                                      struct ieee80211_mgmt *mgmt,
1456                                      size_t len,
1457                                      struct ieee80211_rx_status *rx_status)
1458 {
1459         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1460         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1461         size_t baselen;
1462         struct ieee802_11_elems elems;
1463         struct ieee80211_local *local = sdata->local;
1464         u32 changed = 0;
1465         bool erp_valid, directed_tim = false;
1466         u8 erp_value = 0;
1467         u32 ncrc;
1468         u8 *bssid;
1469
1470         ASSERT_MGD_MTX(ifmgd);
1471
1472         /* Process beacon from the current BSS */
1473         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1474         if (baselen > len)
1475                 return;
1476
1477         if (rx_status->freq != local->hw.conf.channel->center_freq)
1478                 return;
1479
1480         /*
1481          * We might have received a number of frames, among them a
1482          * disassoc frame and a beacon...
1483          */
1484         if (!ifmgd->associated)
1485                 return;
1486
1487         bssid = ifmgd->associated->bssid;
1488
1489         /*
1490          * And in theory even frames from a different AP we were just
1491          * associated to a split-second ago!
1492          */
1493         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1494                 return;
1495
1496         /* Track average RSSI from the Beacon frames of the current AP */
1497         ifmgd->last_beacon_signal = rx_status->signal;
1498         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1499                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1500                 ifmgd->ave_beacon_signal = rx_status->signal;
1501                 ifmgd->last_cqm_event_signal = 0;
1502         } else {
1503                 ifmgd->ave_beacon_signal =
1504                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1505                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1506                          ifmgd->ave_beacon_signal) / 16;
1507         }
1508         if (bss_conf->cqm_rssi_thold &&
1509             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1510                 int sig = ifmgd->ave_beacon_signal / 16;
1511                 int last_event = ifmgd->last_cqm_event_signal;
1512                 int thold = bss_conf->cqm_rssi_thold;
1513                 int hyst = bss_conf->cqm_rssi_hyst;
1514                 if (sig < thold &&
1515                     (last_event == 0 || sig < last_event - hyst)) {
1516                         ifmgd->last_cqm_event_signal = sig;
1517                         ieee80211_cqm_rssi_notify(
1518                                 &sdata->vif,
1519                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1520                                 GFP_KERNEL);
1521                 } else if (sig > thold &&
1522                            (last_event == 0 || sig > last_event + hyst)) {
1523                         ifmgd->last_cqm_event_signal = sig;
1524                         ieee80211_cqm_rssi_notify(
1525                                 &sdata->vif,
1526                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1527                                 GFP_KERNEL);
1528                 }
1529         }
1530
1531         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1532 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1533                 if (net_ratelimit()) {
1534                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1535                                "to a received beacon\n", sdata->name);
1536                 }
1537 #endif
1538                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1539                 mutex_lock(&local->iflist_mtx);
1540                 ieee80211_recalc_ps(local, -1);
1541                 mutex_unlock(&local->iflist_mtx);
1542         }
1543
1544         /*
1545          * Push the beacon loss detection into the future since
1546          * we are processing a beacon from the AP just now.
1547          */
1548         mod_beacon_timer(sdata);
1549
1550         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1551         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1552                                           len - baselen, &elems,
1553                                           care_about_ies, ncrc);
1554
1555         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1556                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1557                                                    ifmgd->aid);
1558
1559         if (ncrc != ifmgd->beacon_crc) {
1560                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1561                                       true);
1562
1563                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1564                                          elems.wmm_param_len);
1565         }
1566
1567         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1568                 if (directed_tim) {
1569                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1570                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1571                                 ieee80211_hw_config(local,
1572                                                     IEEE80211_CONF_CHANGE_PS);
1573                                 ieee80211_send_nullfunc(local, sdata, 0);
1574                         } else {
1575                                 local->pspolling = true;
1576
1577                                 /*
1578                                  * Here is assumed that the driver will be
1579                                  * able to send ps-poll frame and receive a
1580                                  * response even though power save mode is
1581                                  * enabled, but some drivers might require
1582                                  * to disable power save here. This needs
1583                                  * to be investigated.
1584                                  */
1585                                 ieee80211_send_pspoll(local, sdata);
1586                         }
1587                 }
1588         }
1589
1590         if (ncrc == ifmgd->beacon_crc)
1591                 return;
1592         ifmgd->beacon_crc = ncrc;
1593
1594         if (elems.erp_info && elems.erp_info_len >= 1) {
1595                 erp_valid = true;
1596                 erp_value = elems.erp_info[0];
1597         } else {
1598                 erp_valid = false;
1599         }
1600         changed |= ieee80211_handle_bss_capability(sdata,
1601                         le16_to_cpu(mgmt->u.beacon.capab_info),
1602                         erp_valid, erp_value);
1603
1604
1605         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1606             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1607                 struct sta_info *sta;
1608                 struct ieee80211_supported_band *sband;
1609                 u16 ap_ht_cap_flags;
1610
1611                 rcu_read_lock();
1612
1613                 sta = sta_info_get(sdata, bssid);
1614                 if (WARN_ON(!sta)) {
1615                         rcu_read_unlock();
1616                         return;
1617                 }
1618
1619                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1620
1621                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1622                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1623
1624                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1625
1626                 rcu_read_unlock();
1627
1628                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1629                                                bssid, ap_ht_cap_flags);
1630         }
1631
1632         /* Note: country IE parsing is done for us by cfg80211 */
1633         if (elems.country_elem) {
1634                 /* TODO: IBSS also needs this */
1635                 if (elems.pwr_constr_elem)
1636                         ieee80211_handle_pwr_constr(sdata,
1637                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1638                                 elems.pwr_constr_elem,
1639                                 elems.pwr_constr_elem_len);
1640         }
1641
1642         ieee80211_bss_info_change_notify(sdata, changed);
1643 }
1644
1645 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1646                                   struct sk_buff *skb)
1647 {
1648         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1649         struct ieee80211_rx_status *rx_status;
1650         struct ieee80211_mgmt *mgmt;
1651         enum rx_mgmt_action rma = RX_MGMT_NONE;
1652         u16 fc;
1653
1654         rx_status = (struct ieee80211_rx_status *) skb->cb;
1655         mgmt = (struct ieee80211_mgmt *) skb->data;
1656         fc = le16_to_cpu(mgmt->frame_control);
1657
1658         mutex_lock(&ifmgd->mtx);
1659
1660         if (ifmgd->associated &&
1661             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1662                 switch (fc & IEEE80211_FCTL_STYPE) {
1663                 case IEEE80211_STYPE_BEACON:
1664                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1665                                                  rx_status);
1666                         break;
1667                 case IEEE80211_STYPE_PROBE_RESP:
1668                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1669                         break;
1670                 case IEEE80211_STYPE_DEAUTH:
1671                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1672                         break;
1673                 case IEEE80211_STYPE_DISASSOC:
1674                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1675                         break;
1676                 case IEEE80211_STYPE_ACTION:
1677                         switch (mgmt->u.action.category) {
1678                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1679                                 ieee80211_sta_process_chanswitch(sdata,
1680                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1681                                                 (void *)ifmgd->associated->priv,
1682                                                 rx_status->mactime);
1683                                 break;
1684                         }
1685                 }
1686                 mutex_unlock(&ifmgd->mtx);
1687
1688                 switch (rma) {
1689                 case RX_MGMT_NONE:
1690                         /* no action */
1691                         break;
1692                 case RX_MGMT_CFG80211_DEAUTH:
1693                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1694                         break;
1695                 case RX_MGMT_CFG80211_DISASSOC:
1696                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1697                         break;
1698                 default:
1699                         WARN(1, "unexpected: %d", rma);
1700                 }
1701                 return;
1702         }
1703
1704         mutex_unlock(&ifmgd->mtx);
1705
1706         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1707             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1708                 struct ieee80211_local *local = sdata->local;
1709                 struct ieee80211_work *wk;
1710
1711                 mutex_lock(&local->work_mtx);
1712                 list_for_each_entry(wk, &local->work_list, list) {
1713                         if (wk->sdata != sdata)
1714                                 continue;
1715
1716                         if (wk->type != IEEE80211_WORK_ASSOC)
1717                                 continue;
1718
1719                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1720                                 continue;
1721                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1722                                 continue;
1723
1724                         /*
1725                          * Printing the message only here means we can't
1726                          * spuriously print it, but it also means that it
1727                          * won't be printed when the frame comes in before
1728                          * we even tried to associate or in similar cases.
1729                          *
1730                          * Ultimately, I suspect cfg80211 should print the
1731                          * messages instead.
1732                          */
1733                         printk(KERN_DEBUG
1734                                "%s: deauthenticated from %pM (Reason: %u)\n",
1735                                sdata->name, mgmt->bssid,
1736                                le16_to_cpu(mgmt->u.deauth.reason_code));
1737
1738                         list_del_rcu(&wk->list);
1739                         free_work(wk);
1740                         break;
1741                 }
1742                 mutex_unlock(&local->work_mtx);
1743
1744                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1745         }
1746 }
1747
1748 static void ieee80211_sta_timer(unsigned long data)
1749 {
1750         struct ieee80211_sub_if_data *sdata =
1751                 (struct ieee80211_sub_if_data *) data;
1752         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1753         struct ieee80211_local *local = sdata->local;
1754
1755         if (local->quiescing) {
1756                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1757                 return;
1758         }
1759
1760         ieee80211_queue_work(&local->hw, &sdata->work);
1761 }
1762
1763 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
1764 {
1765         struct ieee80211_local *local = sdata->local;
1766         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1767
1768         /* then process the rest of the work */
1769         mutex_lock(&ifmgd->mtx);
1770
1771         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1772                             IEEE80211_STA_CONNECTION_POLL) &&
1773             ifmgd->associated) {
1774                 u8 bssid[ETH_ALEN];
1775
1776                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1777                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1778                         run_again(ifmgd, ifmgd->probe_timeout);
1779
1780                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1781 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1782                         printk(KERN_DEBUG "No probe response from AP %pM"
1783                                 " after %dms, try %d\n", bssid,
1784                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1785                                 ifmgd->probe_send_count);
1786 #endif
1787                         ieee80211_mgd_probe_ap_send(sdata);
1788                 } else {
1789                         /*
1790                          * We actually lost the connection ... or did we?
1791                          * Let's make sure!
1792                          */
1793                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1794                                           IEEE80211_STA_BEACON_POLL);
1795                         printk(KERN_DEBUG "No probe response from AP %pM"
1796                                 " after %dms, disconnecting.\n",
1797                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1798                         ieee80211_set_disassoc(sdata, true);
1799                         ieee80211_recalc_idle(local);
1800                         mutex_unlock(&ifmgd->mtx);
1801                         /*
1802                          * must be outside lock due to cfg80211,
1803                          * but that's not a problem.
1804                          */
1805                         ieee80211_send_deauth_disassoc(sdata, bssid,
1806                                         IEEE80211_STYPE_DEAUTH,
1807                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1808                                         NULL, true);
1809                         mutex_lock(&ifmgd->mtx);
1810                 }
1811         }
1812
1813         mutex_unlock(&ifmgd->mtx);
1814 }
1815
1816 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1817 {
1818         struct ieee80211_sub_if_data *sdata =
1819                 (struct ieee80211_sub_if_data *) data;
1820         struct ieee80211_local *local = sdata->local;
1821
1822         if (local->quiescing)
1823                 return;
1824
1825         ieee80211_queue_work(&sdata->local->hw,
1826                              &sdata->u.mgd.beacon_connection_loss_work);
1827 }
1828
1829 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1830 {
1831         struct ieee80211_sub_if_data *sdata =
1832                 (struct ieee80211_sub_if_data *) data;
1833         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1834         struct ieee80211_local *local = sdata->local;
1835
1836         if (local->quiescing)
1837                 return;
1838
1839         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1840 }
1841
1842 static void ieee80211_sta_monitor_work(struct work_struct *work)
1843 {
1844         struct ieee80211_sub_if_data *sdata =
1845                 container_of(work, struct ieee80211_sub_if_data,
1846                              u.mgd.monitor_work);
1847
1848         ieee80211_mgd_probe_ap(sdata, false);
1849 }
1850
1851 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1852 {
1853         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1854                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1855                                         IEEE80211_STA_CONNECTION_POLL);
1856
1857                 /* let's probe the connection once */
1858                 ieee80211_queue_work(&sdata->local->hw,
1859                            &sdata->u.mgd.monitor_work);
1860                 /* and do all the other regular work too */
1861                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1862         }
1863 }
1864
1865 #ifdef CONFIG_PM
1866 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1867 {
1868         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1869
1870         /*
1871          * we need to use atomic bitops for the running bits
1872          * only because both timers might fire at the same
1873          * time -- the code here is properly synchronised.
1874          */
1875
1876         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1877         if (del_timer_sync(&ifmgd->timer))
1878                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1879
1880         cancel_work_sync(&ifmgd->chswitch_work);
1881         if (del_timer_sync(&ifmgd->chswitch_timer))
1882                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1883
1884         cancel_work_sync(&ifmgd->monitor_work);
1885         /* these will just be re-established on connection */
1886         del_timer_sync(&ifmgd->conn_mon_timer);
1887         del_timer_sync(&ifmgd->bcn_mon_timer);
1888 }
1889
1890 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1891 {
1892         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1893
1894         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1895                 add_timer(&ifmgd->timer);
1896         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1897                 add_timer(&ifmgd->chswitch_timer);
1898 }
1899 #endif
1900
1901 /* interface setup */
1902 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1903 {
1904         struct ieee80211_if_managed *ifmgd;
1905
1906         ifmgd = &sdata->u.mgd;
1907         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1908         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1909         INIT_WORK(&ifmgd->beacon_connection_loss_work,
1910                   ieee80211_beacon_connection_loss_work);
1911         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1912                     (unsigned long) sdata);
1913         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1914                     (unsigned long) sdata);
1915         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1916                     (unsigned long) sdata);
1917         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1918                     (unsigned long) sdata);
1919
1920         ifmgd->flags = 0;
1921
1922         mutex_init(&ifmgd->mtx);
1923
1924         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1925                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1926         else
1927                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1928 }
1929
1930 /* scan finished notification */
1931 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1932 {
1933         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1934
1935         /* Restart STA timers */
1936         rcu_read_lock();
1937         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1938                 ieee80211_restart_sta_timer(sdata);
1939         rcu_read_unlock();
1940 }
1941
1942 int ieee80211_max_network_latency(struct notifier_block *nb,
1943                                   unsigned long data, void *dummy)
1944 {
1945         s32 latency_usec = (s32) data;
1946         struct ieee80211_local *local =
1947                 container_of(nb, struct ieee80211_local,
1948                              network_latency_notifier);
1949
1950         mutex_lock(&local->iflist_mtx);
1951         ieee80211_recalc_ps(local, latency_usec);
1952         mutex_unlock(&local->iflist_mtx);
1953
1954         return 0;
1955 }
1956
1957 /* config hooks */
1958 static enum work_done_result
1959 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1960                           struct sk_buff *skb)
1961 {
1962         if (!skb) {
1963                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1964                 return WORK_DONE_DESTROY;
1965         }
1966
1967         if (wk->type == IEEE80211_WORK_AUTH) {
1968                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1969                 return WORK_DONE_DESTROY;
1970         }
1971
1972         mutex_lock(&wk->sdata->u.mgd.mtx);
1973         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1974         mutex_unlock(&wk->sdata->u.mgd.mtx);
1975
1976         wk->type = IEEE80211_WORK_AUTH;
1977         wk->probe_auth.tries = 0;
1978         return WORK_DONE_REQUEUE;
1979 }
1980
1981 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1982                        struct cfg80211_auth_request *req)
1983 {
1984         const u8 *ssid;
1985         struct ieee80211_work *wk;
1986         u16 auth_alg;
1987
1988         if (req->local_state_change)
1989                 return 0; /* no need to update mac80211 state */
1990
1991         switch (req->auth_type) {
1992         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1993                 auth_alg = WLAN_AUTH_OPEN;
1994                 break;
1995         case NL80211_AUTHTYPE_SHARED_KEY:
1996                 auth_alg = WLAN_AUTH_SHARED_KEY;
1997                 break;
1998         case NL80211_AUTHTYPE_FT:
1999                 auth_alg = WLAN_AUTH_FT;
2000                 break;
2001         case NL80211_AUTHTYPE_NETWORK_EAP:
2002                 auth_alg = WLAN_AUTH_LEAP;
2003                 break;
2004         default:
2005                 return -EOPNOTSUPP;
2006         }
2007
2008         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2009         if (!wk)
2010                 return -ENOMEM;
2011
2012         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2013
2014         if (req->ie && req->ie_len) {
2015                 memcpy(wk->ie, req->ie, req->ie_len);
2016                 wk->ie_len = req->ie_len;
2017         }
2018
2019         if (req->key && req->key_len) {
2020                 wk->probe_auth.key_len = req->key_len;
2021                 wk->probe_auth.key_idx = req->key_idx;
2022                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2023         }
2024
2025         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2026         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2027         wk->probe_auth.ssid_len = ssid[1];
2028
2029         wk->probe_auth.algorithm = auth_alg;
2030         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2031
2032         /* if we already have a probe, don't probe again */
2033         if (req->bss->proberesp_ies)
2034                 wk->type = IEEE80211_WORK_AUTH;
2035         else
2036                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2037         wk->chan = req->bss->channel;
2038         wk->sdata = sdata;
2039         wk->done = ieee80211_probe_auth_done;
2040
2041         ieee80211_add_work(wk);
2042         return 0;
2043 }
2044
2045 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2046                                                   struct sk_buff *skb)
2047 {
2048         struct ieee80211_mgmt *mgmt;
2049         u16 status;
2050
2051         if (!skb) {
2052                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2053                 return WORK_DONE_DESTROY;
2054         }
2055
2056         mgmt = (void *)skb->data;
2057         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2058
2059         if (status == WLAN_STATUS_SUCCESS) {
2060                 mutex_lock(&wk->sdata->u.mgd.mtx);
2061                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2062                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2063                         /* oops -- internal error -- send timeout for now */
2064                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2065                                                     wk->filter_ta);
2066                         return WORK_DONE_DESTROY;
2067                 }
2068
2069                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2070         }
2071
2072         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2073         return WORK_DONE_DESTROY;
2074 }
2075
2076 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2077                         struct cfg80211_assoc_request *req)
2078 {
2079         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2080         struct ieee80211_bss *bss = (void *)req->bss->priv;
2081         struct ieee80211_work *wk;
2082         const u8 *ssid;
2083         int i;
2084
2085         mutex_lock(&ifmgd->mtx);
2086         if (ifmgd->associated) {
2087                 if (!req->prev_bssid ||
2088                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2089                            ETH_ALEN)) {
2090                         /*
2091                          * We are already associated and the request was not a
2092                          * reassociation request from the current BSS, so
2093                          * reject it.
2094                          */
2095                         mutex_unlock(&ifmgd->mtx);
2096                         return -EALREADY;
2097                 }
2098
2099                 /* Trying to reassociate - clear previous association state */
2100                 ieee80211_set_disassoc(sdata, true);
2101         }
2102         mutex_unlock(&ifmgd->mtx);
2103
2104         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2105         if (!wk)
2106                 return -ENOMEM;
2107
2108         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2109         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2110
2111         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2112                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2113                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2114                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2115                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2116
2117
2118         if (req->ie && req->ie_len) {
2119                 memcpy(wk->ie, req->ie, req->ie_len);
2120                 wk->ie_len = req->ie_len;
2121         } else
2122                 wk->ie_len = 0;
2123
2124         wk->assoc.bss = req->bss;
2125
2126         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2127
2128         /* new association always uses requested smps mode */
2129         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2130                 if (ifmgd->powersave)
2131                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2132                 else
2133                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2134         } else
2135                 ifmgd->ap_smps = ifmgd->req_smps;
2136
2137         wk->assoc.smps = ifmgd->ap_smps;
2138         /*
2139          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2140          * We still associate in non-HT mode (11a/b/g) if any one of these
2141          * ciphers is configured as pairwise.
2142          * We can set this to true for non-11n hardware, that'll be checked
2143          * separately along with the peer capabilities.
2144          */
2145         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2146         wk->assoc.capability = req->bss->capability;
2147         wk->assoc.wmm_used = bss->wmm_used;
2148         wk->assoc.supp_rates = bss->supp_rates;
2149         wk->assoc.supp_rates_len = bss->supp_rates_len;
2150         wk->assoc.ht_information_ie =
2151                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2152
2153         if (bss->wmm_used && bss->uapsd_supported &&
2154             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2155                 wk->assoc.uapsd_used = true;
2156                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2157         } else {
2158                 wk->assoc.uapsd_used = false;
2159                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2160         }
2161
2162         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2163         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2164         wk->assoc.ssid_len = ssid[1];
2165
2166         if (req->prev_bssid)
2167                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2168
2169         wk->type = IEEE80211_WORK_ASSOC;
2170         wk->chan = req->bss->channel;
2171         wk->sdata = sdata;
2172         wk->done = ieee80211_assoc_done;
2173
2174         if (req->use_mfp) {
2175                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2176                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2177         } else {
2178                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2179                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2180         }
2181
2182         if (req->crypto.control_port)
2183                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2184         else
2185                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2186
2187         ieee80211_add_work(wk);
2188         return 0;
2189 }
2190
2191 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2192                          struct cfg80211_deauth_request *req,
2193                          void *cookie)
2194 {
2195         struct ieee80211_local *local = sdata->local;
2196         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2197         struct ieee80211_work *wk;
2198         u8 bssid[ETH_ALEN];
2199         bool assoc_bss = false;
2200
2201         mutex_lock(&ifmgd->mtx);
2202
2203         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2204         if (ifmgd->associated == req->bss) {
2205                 ieee80211_set_disassoc(sdata, false);
2206                 mutex_unlock(&ifmgd->mtx);
2207                 assoc_bss = true;
2208         } else {
2209                 bool not_auth_yet = false;
2210
2211                 mutex_unlock(&ifmgd->mtx);
2212
2213                 mutex_lock(&local->work_mtx);
2214                 list_for_each_entry(wk, &local->work_list, list) {
2215                         if (wk->sdata != sdata)
2216                                 continue;
2217
2218                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2219                             wk->type != IEEE80211_WORK_AUTH &&
2220                             wk->type != IEEE80211_WORK_ASSOC)
2221                                 continue;
2222
2223                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2224                                 continue;
2225
2226                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2227                         list_del_rcu(&wk->list);
2228                         free_work(wk);
2229                         break;
2230                 }
2231                 mutex_unlock(&local->work_mtx);
2232
2233                 /*
2234                  * If somebody requests authentication and we haven't
2235                  * sent out an auth frame yet there's no need to send
2236                  * out a deauth frame either. If the state was PROBE,
2237                  * then this is the case. If it's AUTH we have sent a
2238                  * frame, and if it's IDLE we have completed the auth
2239                  * process already.
2240                  */
2241                 if (not_auth_yet) {
2242                         __cfg80211_auth_canceled(sdata->dev, bssid);
2243                         return 0;
2244                 }
2245         }
2246
2247         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2248                sdata->name, bssid, req->reason_code);
2249
2250         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2251                                        req->reason_code, cookie,
2252                                        !req->local_state_change);
2253         if (assoc_bss)
2254                 sta_info_destroy_addr(sdata, bssid);
2255
2256         ieee80211_recalc_idle(sdata->local);
2257
2258         return 0;
2259 }
2260
2261 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2262                            struct cfg80211_disassoc_request *req,
2263                            void *cookie)
2264 {
2265         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2266         u8 bssid[ETH_ALEN];
2267
2268         mutex_lock(&ifmgd->mtx);
2269
2270         /*
2271          * cfg80211 should catch this ... but it's racy since
2272          * we can receive a disassoc frame, process it, hand it
2273          * to cfg80211 while that's in a locked section already
2274          * trying to tell us that the user wants to disconnect.
2275          */
2276         if (ifmgd->associated != req->bss) {
2277                 mutex_unlock(&ifmgd->mtx);
2278                 return -ENOLINK;
2279         }
2280
2281         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2282                sdata->name, req->bss->bssid, req->reason_code);
2283
2284         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2285         ieee80211_set_disassoc(sdata, false);
2286
2287         mutex_unlock(&ifmgd->mtx);
2288
2289         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2290                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2291                         cookie, !req->local_state_change);
2292         sta_info_destroy_addr(sdata, bssid);
2293
2294         ieee80211_recalc_idle(sdata->local);
2295
2296         return 0;
2297 }
2298
2299 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2300                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2301                                gfp_t gfp)
2302 {
2303         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2304
2305         trace_api_cqm_rssi_notify(sdata, rssi_event);
2306
2307         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2308 }
2309 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);