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/moduleparam.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/pm_qos.h>
  22 #include <linux/crc32.h>
  23 #include <linux/slab.h>
  24 #include <linux/export.h>
  25 #include <net/mac80211.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "led.h"
  32
  33 static int max_nullfunc_tries = 2;
  34 module_param(max_nullfunc_tries, int, 0644);
  35 MODULE_PARM_DESC(max_nullfunc_tries,
  36                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  37
  38 static int max_probe_tries = 5;
  39 module_param(max_probe_tries, int, 0644);
  40 MODULE_PARM_DESC(max_probe_tries,
  41                  "Maximum probe tries before disconnecting (reason 4).");
  42
  43 /*
  44  * Beacon loss timeout is calculated as N frames times the
  45  * advertised beacon interval.  This may need to be somewhat
  46  * higher than what hardware might detect to account for
  47  * delays in the host processing frames. But since we also
  48  * probe on beacon miss before declaring the connection lost
  49  * default to what we want.
  50  */
  51 #define IEEE80211_BEACON_LOSS_COUNT     7
  52
  53 /*
  54  * Time the connection can be idle before we probe
  55  * it to see if we can still talk to the AP.
  56  */
  57 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  58 /*
  59  * Time we wait for a probe response after sending
  60  * a probe request because of beacon loss or for
  61  * checking the connection still works.
  62  */
  63 static int probe_wait_ms = 500;
  64 module_param(probe_wait_ms, int, 0644);
  65 MODULE_PARM_DESC(probe_wait_ms,
  66                  "Maximum time(ms) to wait for probe response"
  67                  " before disconnecting (reason 4).");
  68
  69 /*
  70  * Weight given to the latest Beacon frame when calculating average signal
  71  * strength for Beacon frames received in the current BSS. This must be
  72  * between 1 and 15.
  73  */
  74 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  75
  76 /*
  77  * How many Beacon frames need to have been used in average signal strength
  78  * before starting to indicate signal change events.
  79  */
  80 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  81
  82 #define TMR_RUNNING_TIMER       0
  83 #define TMR_RUNNING_CHANSW      1
  84
  85 /*
  86  * All cfg80211 functions have to be called outside a locked
  87  * section so that they can acquire a lock themselves... This
  88  * is much simpler than queuing up things in cfg80211, but we
  89  * do need some indirection for that here.
  90  */
  91 enum rx_mgmt_action {
  92         /* no action required */
  93         RX_MGMT_NONE,
  94
  95         /* caller must call cfg80211_send_deauth() */
  96         RX_MGMT_CFG80211_DEAUTH,
  97
  98         /* caller must call cfg80211_send_disassoc() */
  99         RX_MGMT_CFG80211_DISASSOC,
 100 };
 101
 102 /* utils */
 103 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 104 {
 105         lockdep_assert_held(&ifmgd->mtx);
 106 }
 107
 108 /*
 109  * We can have multiple work items (and connection probing)
 110  * scheduling this timer, but we need to take care to only
 111  * reschedule it when it should fire _earlier_ than it was
 112  * asked for before, or if it's not pending right now. This
 113  * function ensures that. Note that it then is required to
 114  * run this function for all timeouts after the first one
 115  * has happened -- the work that runs from this timer will
 116  * do that.
 117  */
 118 static void run_again(struct ieee80211_if_managed *ifmgd,
 119                              unsigned long timeout)
 120 {
 121         ASSERT_MGD_MTX(ifmgd);
 122
 123         if (!timer_pending(&ifmgd->timer) ||
 124             time_before(timeout, ifmgd->timer.expires))
 125                 mod_timer(&ifmgd->timer, timeout);
 126 }
 127
 128 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 129 {
 130         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 131                 return;
 132
 133         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 134                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 135 }
 136
 137 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 138 {
 139         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 140
 141         if (unlikely(!sdata->u.mgd.associated))
 142                 return;
 143
 144         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 145                 return;
 146
 147         mod_timer(&sdata->u.mgd.conn_mon_timer,
 148                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 149
 150         ifmgd->probe_send_count = 0;
 151 }
 152
 153 static int ecw2cw(int ecw)
 154 {
 155         return (1 << ecw) - 1;
 156 }
 157
 158 /*
 159  * ieee80211_enable_ht should be called only after the operating band
 160  * has been determined as ht configuration depends on the hw's
 161  * HT abilities for a specific band.
 162  */
 163 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 164                                struct ieee80211_ht_info *hti,
 165                                const u8 *bssid, u16 ap_ht_cap_flags,
 166                                bool beacon_htcap_ie)
 167 {
 168         struct ieee80211_local *local = sdata->local;
 169         struct ieee80211_supported_band *sband;
 170         struct sta_info *sta;
 171         u32 changed = 0;
 172         int hti_cfreq;
 173         u16 ht_opmode;
 174         bool enable_ht = true;
 175         enum nl80211_channel_type prev_chantype;
 176         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 177
 178         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 179
 180         prev_chantype = sdata->vif.bss_conf.channel_type;
 181
 182         /* HT is not supported */
 183         if (!sband->ht_cap.ht_supported)
 184                 enable_ht = false;
 185
 186         if (enable_ht) {
 187                 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
 188                                                            sband->band);
 189                 /* check that channel matches the right operating channel */
 190                 if (local->hw.conf.channel->center_freq != hti_cfreq) {
 191                         /* Some APs mess this up, evidently.
 192                          * Netgear WNDR3700 sometimes reports 4 higher than
 193                          * the actual channel, for instance.
 194                          */
 195                         printk(KERN_DEBUG
 196                                "%s: Wrong control channel in association"
 197                                " response: configured center-freq: %d"
 198                                " hti-cfreq: %d  hti->control_chan: %d"
 199                                " band: %d.  Disabling HT.\n",
 200                                sdata->name,
 201                                local->hw.conf.channel->center_freq,
 202                                hti_cfreq, hti->control_chan,
 203                                sband->band);
 204                         enable_ht = false;
 205                 }
 206         }
 207
 208         if (enable_ht) {
 209                 channel_type = NL80211_CHAN_HT20;
 210
 211                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 212                     !ieee80111_cfg_override_disables_ht40(sdata) &&
 213                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 214                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 215                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 216                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 217                                 if (!(local->hw.conf.channel->flags &
 218                                     IEEE80211_CHAN_NO_HT40PLUS))
 219                                         channel_type = NL80211_CHAN_HT40PLUS;
 220                                 break;
 221                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 222                                 if (!(local->hw.conf.channel->flags &
 223                                     IEEE80211_CHAN_NO_HT40MINUS))
 224                                         channel_type = NL80211_CHAN_HT40MINUS;
 225                                 break;
 226                         }
 227                 }
 228         }
 229
 230         if (local->tmp_channel)
 231                 local->tmp_channel_type = channel_type;
 232
 233         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 234                 /* can only fail due to HT40+/- mismatch */
 235                 channel_type = NL80211_CHAN_HT20;
 236                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 237         }
 238
 239         if (beacon_htcap_ie && (prev_chantype != channel_type)) {
 240                 /*
 241                  * Whenever the AP announces the HT mode change that can be
 242                  * 40MHz intolerant or etc., it would be safer to stop tx
 243                  * queues before doing hw config to avoid buffer overflow.
 244                  */
 245                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 246                                 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
 247
 248                 /* flush out all packets */
 249                 synchronize_net();
 250
 251                 drv_flush(local, false);
 252         }
 253
 254         /* channel_type change automatically detected */
 255         ieee80211_hw_config(local, 0);
 256
 257         if (prev_chantype != channel_type) {
 258                 rcu_read_lock();
 259                 sta = sta_info_get(sdata, bssid);
 260                 if (sta)
 261                         rate_control_rate_update(local, sband, sta,
 262                                                  IEEE80211_RC_HT_CHANGED,
 263                                                  channel_type);
 264                 rcu_read_unlock();
 265
 266                 if (beacon_htcap_ie)
 267                         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 268                                 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
 269         }
 270
 271         ht_opmode = le16_to_cpu(hti->operation_mode);
 272
 273         /* if bss configuration changed store the new one */
 274         if (sdata->ht_opmode_valid != enable_ht ||
 275             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 276             prev_chantype != channel_type) {
 277                 changed |= BSS_CHANGED_HT;
 278                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 279                 sdata->ht_opmode_valid = enable_ht;
 280         }
 281
 282         return changed;
 283 }
 284
 285 /* frame sending functions */
 286
 287 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 288                                            const u8 *bssid, u16 stype, u16 reason,
 289                                            void *cookie, bool send_frame)
 290 {
 291         struct ieee80211_local *local = sdata->local;
 292         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 293         struct sk_buff *skb;
 294         struct ieee80211_mgmt *mgmt;
 295
 296         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 297         if (!skb)
 298                 return;
 299
 300         skb_reserve(skb, local->hw.extra_tx_headroom);
 301
 302         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 303         memset(mgmt, 0, 24);
 304         memcpy(mgmt->da, bssid, ETH_ALEN);
 305         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 306         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 307         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 308         skb_put(skb, 2);
 309         /* u.deauth.reason_code == u.disassoc.reason_code */
 310         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 311
 312         if (stype == IEEE80211_STYPE_DEAUTH)
 313                 if (cookie)
 314                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 315                 else
 316                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 317         else
 318                 if (cookie)
 319                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 320                 else
 321                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 322         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 323                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 324
 325         if (send_frame)
 326                 ieee80211_tx_skb(sdata, skb);
 327         else
 328                 kfree_skb(skb);
 329 }
 330
 331 void ieee80211_send_pspoll(struct ieee80211_local *local,
 332                            struct ieee80211_sub_if_data *sdata)
 333 {
 334         struct ieee80211_pspoll *pspoll;
 335         struct sk_buff *skb;
 336
 337         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 338         if (!skb)
 339                 return;
 340
 341         pspoll = (struct ieee80211_pspoll *) skb->data;
 342         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 343
 344         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 345         ieee80211_tx_skb(sdata, skb);
 346 }
 347
 348 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 349                              struct ieee80211_sub_if_data *sdata,
 350                              int powersave)
 351 {
 352         struct sk_buff *skb;
 353         struct ieee80211_hdr_3addr *nullfunc;
 354         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 355
 356         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 357         if (!skb)
 358                 return;
 359
 360         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 361         if (powersave)
 362                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 363
 364         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 365         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 366                             IEEE80211_STA_CONNECTION_POLL))
 367                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 368
 369         ieee80211_tx_skb(sdata, skb);
 370 }
 371
 372 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 373                                           struct ieee80211_sub_if_data *sdata)
 374 {
 375         struct sk_buff *skb;
 376         struct ieee80211_hdr *nullfunc;
 377         __le16 fc;
 378
 379         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 380                 return;
 381
 382         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 383         if (!skb)
 384                 return;
 385
 386         skb_reserve(skb, local->hw.extra_tx_headroom);
 387
 388         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 389         memset(nullfunc, 0, 30);
 390         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 391                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 392         nullfunc->frame_control = fc;
 393         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 394         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 395         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 396         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 397
 398         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 399         ieee80211_tx_skb(sdata, skb);
 400 }
 401
 402 /* spectrum management related things */
 403 static void ieee80211_chswitch_work(struct work_struct *work)
 404 {
 405         struct ieee80211_sub_if_data *sdata =
 406                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 407         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 408
 409         if (!ieee80211_sdata_running(sdata))
 410                 return;
 411
 412         mutex_lock(&ifmgd->mtx);
 413         if (!ifmgd->associated)
 414                 goto out;
 415
 416         sdata->local->oper_channel = sdata->local->csa_channel;
 417         if (!sdata->local->ops->channel_switch) {
 418                 /* call "hw_config" only if doing sw channel switch */
 419                 ieee80211_hw_config(sdata->local,
 420                         IEEE80211_CONF_CHANGE_CHANNEL);
 421         } else {
 422                 /* update the device channel directly */
 423                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
 424         }
 425
 426         /* XXX: shouldn't really modify cfg80211-owned data! */
 427         ifmgd->associated->channel = sdata->local->oper_channel;
 428
 429         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 430                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 431  out:
 432         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 433         mutex_unlock(&ifmgd->mtx);
 434 }
 435
 436 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 437 {
 438         struct ieee80211_sub_if_data *sdata;
 439         struct ieee80211_if_managed *ifmgd;
 440
 441         sdata = vif_to_sdata(vif);
 442         ifmgd = &sdata->u.mgd;
 443
 444         trace_api_chswitch_done(sdata, success);
 445         if (!success) {
 446                 /*
 447                  * If the channel switch was not successful, stay
 448                  * around on the old channel. We currently lack
 449                  * good handling of this situation, possibly we
 450                  * should just drop the association.
 451                  */
 452                 sdata->local->csa_channel = sdata->local->oper_channel;
 453         }
 454
 455         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 456 }
 457 EXPORT_SYMBOL(ieee80211_chswitch_done);
 458
 459 static void ieee80211_chswitch_timer(unsigned long data)
 460 {
 461         struct ieee80211_sub_if_data *sdata =
 462                 (struct ieee80211_sub_if_data *) data;
 463         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 464
 465         if (sdata->local->quiescing) {
 466                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 467                 return;
 468         }
 469
 470         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 471 }
 472
 473 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 474                                       struct ieee80211_channel_sw_ie *sw_elem,
 475                                       struct ieee80211_bss *bss,
 476                                       u64 timestamp)
 477 {
 478         struct cfg80211_bss *cbss =
 479                 container_of((void *)bss, struct cfg80211_bss, priv);
 480         struct ieee80211_channel *new_ch;
 481         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 482         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 483                                                       cbss->channel->band);
 484
 485         ASSERT_MGD_MTX(ifmgd);
 486
 487         if (!ifmgd->associated)
 488                 return;
 489
 490         if (sdata->local->scanning)
 491                 return;
 492
 493         /* Disregard subsequent beacons if we are already running a timer
 494            processing a CSA */
 495
 496         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 497                 return;
 498
 499         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 500         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 501                 return;
 502
 503         sdata->local->csa_channel = new_ch;
 504
 505         if (sdata->local->ops->channel_switch) {
 506                 /* use driver's channel switch callback */
 507                 struct ieee80211_channel_switch ch_switch;
 508                 memset(&ch_switch, 0, sizeof(ch_switch));
 509                 ch_switch.timestamp = timestamp;
 510                 if (sw_elem->mode) {
 511                         ch_switch.block_tx = true;
 512                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 513                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 514                 }
 515                 ch_switch.channel = new_ch;
 516                 ch_switch.count = sw_elem->count;
 517                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 518                 drv_channel_switch(sdata->local, &ch_switch);
 519                 return;
 520         }
 521
 522         /* channel switch handled in software */
 523         if (sw_elem->count <= 1) {
 524                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 525         } else {
 526                 if (sw_elem->mode)
 527                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 528                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 529                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 530                 mod_timer(&ifmgd->chswitch_timer,
 531                           jiffies +
 532                           msecs_to_jiffies(sw_elem->count *
 533                                            cbss->beacon_interval));
 534         }
 535 }
 536
 537 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 538                                         u16 capab_info, u8 *pwr_constr_elem,
 539                                         u8 pwr_constr_elem_len)
 540 {
 541         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 542
 543         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 544                 return;
 545
 546         /* Power constraint IE length should be 1 octet */
 547         if (pwr_constr_elem_len != 1)
 548                 return;
 549
 550         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 551             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 552                 sdata->local->power_constr_level = *pwr_constr_elem;
 553                 ieee80211_hw_config(sdata->local, 0);
 554         }
 555 }
 556
 557 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 558 {
 559         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 560         struct ieee80211_local *local = sdata->local;
 561         struct ieee80211_conf *conf = &local->hw.conf;
 562
 563         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 564                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 565                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 566
 567         local->disable_dynamic_ps = false;
 568         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 569 }
 570 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 571
 572 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 573 {
 574         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 575         struct ieee80211_local *local = sdata->local;
 576         struct ieee80211_conf *conf = &local->hw.conf;
 577
 578         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 579                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 580                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 581
 582         local->disable_dynamic_ps = true;
 583         conf->dynamic_ps_timeout = 0;
 584         del_timer_sync(&local->dynamic_ps_timer);
 585         ieee80211_queue_work(&local->hw,
 586                              &local->dynamic_ps_enable_work);
 587 }
 588 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 589
 590 /* powersave */
 591 static void ieee80211_enable_ps(struct ieee80211_local *local,
 592                                 struct ieee80211_sub_if_data *sdata)
 593 {
 594         struct ieee80211_conf *conf = &local->hw.conf;
 595
 596         /*
 597          * If we are scanning right now then the parameters will
 598          * take effect when scan finishes.
 599          */
 600         if (local->scanning)
 601                 return;
 602
 603         if (conf->dynamic_ps_timeout > 0 &&
 604             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 605                 mod_timer(&local->dynamic_ps_timer, jiffies +
 606                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 607         } else {
 608                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 609                         ieee80211_send_nullfunc(local, sdata, 1);
 610
 611                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 612                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 613                         return;
 614
 615                 conf->flags |= IEEE80211_CONF_PS;
 616                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 617         }
 618 }
 619
 620 static void ieee80211_change_ps(struct ieee80211_local *local)
 621 {
 622         struct ieee80211_conf *conf = &local->hw.conf;
 623
 624         if (local->ps_sdata) {
 625                 ieee80211_enable_ps(local, local->ps_sdata);
 626         } else if (conf->flags & IEEE80211_CONF_PS) {
 627                 conf->flags &= ~IEEE80211_CONF_PS;
 628                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 629                 del_timer_sync(&local->dynamic_ps_timer);
 630                 cancel_work_sync(&local->dynamic_ps_enable_work);
 631         }
 632 }
 633
 634 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 635 {
 636         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 637         struct sta_info *sta = NULL;
 638         bool authorized = false;
 639
 640         if (!mgd->powersave)
 641                 return false;
 642
 643         if (mgd->broken_ap)
 644                 return false;
 645
 646         if (!mgd->associated)
 647                 return false;
 648
 649         if (!mgd->associated->beacon_ies)
 650                 return false;
 651
 652         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 653                           IEEE80211_STA_CONNECTION_POLL))
 654                 return false;
 655
 656         rcu_read_lock();
 657         sta = sta_info_get(sdata, mgd->bssid);
 658         if (sta)
 659                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 660         rcu_read_unlock();
 661
 662         return authorized;
 663 }
 664
 665 /* need to hold RTNL or interface lock */
 666 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 667 {
 668         struct ieee80211_sub_if_data *sdata, *found = NULL;
 669         int count = 0;
 670         int timeout;
 671
 672         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 673                 local->ps_sdata = NULL;
 674                 return;
 675         }
 676
 677         if (!list_empty(&local->work_list)) {
 678                 local->ps_sdata = NULL;
 679                 goto change;
 680         }
 681
 682         list_for_each_entry(sdata, &local->interfaces, list) {
 683                 if (!ieee80211_sdata_running(sdata))
 684                         continue;
 685                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 686                         /* If an AP vif is found, then disable PS
 687                          * by setting the count to zero thereby setting
 688                          * ps_sdata to NULL.
 689                          */
 690                         count = 0;
 691                         break;
 692                 }
 693                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 694                         continue;
 695                 found = sdata;
 696                 count++;
 697         }
 698
 699         if (count == 1 && ieee80211_powersave_allowed(found)) {
 700                 struct ieee80211_conf *conf = &local->hw.conf;
 701                 s32 beaconint_us;
 702
 703                 if (latency < 0)
 704                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 705
 706                 beaconint_us = ieee80211_tu_to_usec(
 707                                         found->vif.bss_conf.beacon_int);
 708
 709                 timeout = local->dynamic_ps_forced_timeout;
 710                 if (timeout < 0) {
 711                         /*
 712                          * Go to full PSM if the user configures a very low
 713                          * latency requirement.
 714                          * The 2000 second value is there for compatibility
 715                          * until the PM_QOS_NETWORK_LATENCY is configured
 716                          * with real values.
 717                          */
 718                         if (latency > (1900 * USEC_PER_MSEC) &&
 719                             latency != (2000 * USEC_PER_SEC))
 720                                 timeout = 0;
 721                         else
 722                                 timeout = 100;
 723                 }
 724                 local->dynamic_ps_user_timeout = timeout;
 725                 if (!local->disable_dynamic_ps)
 726                         conf->dynamic_ps_timeout =
 727                                 local->dynamic_ps_user_timeout;
 728
 729                 if (beaconint_us > latency) {
 730                         local->ps_sdata = NULL;
 731                 } else {
 732                         struct ieee80211_bss *bss;
 733                         int maxslp = 1;
 734                         u8 dtimper;
 735
 736                         bss = (void *)found->u.mgd.associated->priv;
 737                         dtimper = bss->dtim_period;
 738
 739                         /* If the TIM IE is invalid, pretend the value is 1 */
 740                         if (!dtimper)
 741                                 dtimper = 1;
 742                         else if (dtimper > 1)
 743                                 maxslp = min_t(int, dtimper,
 744                                                     latency / beaconint_us);
 745
 746                         local->hw.conf.max_sleep_period = maxslp;
 747                         local->hw.conf.ps_dtim_period = dtimper;
 748                         local->ps_sdata = found;
 749                 }
 750         } else {
 751                 local->ps_sdata = NULL;
 752         }
 753
 754  change:
 755         ieee80211_change_ps(local);
 756 }
 757
 758 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 759 {
 760         struct ieee80211_local *local =
 761                 container_of(work, struct ieee80211_local,
 762                              dynamic_ps_disable_work);
 763
 764         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 765                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 766                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 767         }
 768
 769         ieee80211_wake_queues_by_reason(&local->hw,
 770                                         IEEE80211_QUEUE_STOP_REASON_PS);
 771 }
 772
 773 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 774 {
 775         struct ieee80211_local *local =
 776                 container_of(work, struct ieee80211_local,
 777                              dynamic_ps_enable_work);
 778         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 779         struct ieee80211_if_managed *ifmgd;
 780         unsigned long flags;
 781         int q;
 782
 783         /* can only happen when PS was just disabled anyway */
 784         if (!sdata)
 785                 return;
 786
 787         ifmgd = &sdata->u.mgd;
 788
 789         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 790                 return;
 791
 792         if (!local->disable_dynamic_ps &&
 793             local->hw.conf.dynamic_ps_timeout > 0) {
 794                 /* don't enter PS if TX frames are pending */
 795                 if (drv_tx_frames_pending(local)) {
 796                         mod_timer(&local->dynamic_ps_timer, jiffies +
 797                                   msecs_to_jiffies(
 798                                   local->hw.conf.dynamic_ps_timeout));
 799                         return;
 800                 }
 801
 802                 /*
 803                  * transmission can be stopped by others which leads to
 804                  * dynamic_ps_timer expiry. Postpone the ps timer if it
 805                  * is not the actual idle state.
 806                  */
 807                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 808                 for (q = 0; q < local->hw.queues; q++) {
 809                         if (local->queue_stop_reasons[q]) {
 810                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
 811                                                        flags);
 812                                 mod_timer(&local->dynamic_ps_timer, jiffies +
 813                                           msecs_to_jiffies(
 814                                           local->hw.conf.dynamic_ps_timeout));
 815                                 return;
 816                         }
 817                 }
 818                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 819         }
 820
 821         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 822             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 823                 netif_tx_stop_all_queues(sdata->dev);
 824
 825                 if (drv_tx_frames_pending(local))
 826                         mod_timer(&local->dynamic_ps_timer, jiffies +
 827                                   msecs_to_jiffies(
 828                                   local->hw.conf.dynamic_ps_timeout));
 829                 else {
 830                         ieee80211_send_nullfunc(local, sdata, 1);
 831                         /* Flush to get the tx status of nullfunc frame */
 832                         drv_flush(local, false);
 833                 }
 834         }
 835
 836         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 837               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 838             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 839                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 840                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 841                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 842         }
 843
 844         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 845                 netif_tx_wake_all_queues(sdata->dev);
 846 }
 847
 848 void ieee80211_dynamic_ps_timer(unsigned long data)
 849 {
 850         struct ieee80211_local *local = (void *) data;
 851
 852         if (local->quiescing || local->suspended)
 853                 return;
 854
 855         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 856 }
 857
 858 /* MLME */
 859 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 860                                      struct ieee80211_sub_if_data *sdata,
 861                                      u8 *wmm_param, size_t wmm_param_len)
 862 {
 863         struct ieee80211_tx_queue_params params;
 864         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 865         size_t left;
 866         int count;
 867         u8 *pos, uapsd_queues = 0;
 868
 869         if (!local->ops->conf_tx)
 870                 return;
 871
 872         if (local->hw.queues < 4)
 873                 return;
 874
 875         if (!wmm_param)
 876                 return;
 877
 878         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 879                 return;
 880
 881         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 882                 uapsd_queues = local->uapsd_queues;
 883
 884         count = wmm_param[6] & 0x0f;
 885         if (count == ifmgd->wmm_last_param_set)
 886                 return;
 887         ifmgd->wmm_last_param_set = count;
 888
 889         pos = wmm_param + 8;
 890         left = wmm_param_len - 8;
 891
 892         memset(&params, 0, sizeof(params));
 893
 894         local->wmm_acm = 0;
 895         for (; left >= 4; left -= 4, pos += 4) {
 896                 int aci = (pos[0] >> 5) & 0x03;
 897                 int acm = (pos[0] >> 4) & 0x01;
 898                 bool uapsd = false;
 899                 int queue;
 900
 901                 switch (aci) {
 902                 case 1: /* AC_BK */
 903                         queue = 3;
 904                         if (acm)
 905                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 906                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 907                                 uapsd = true;
 908                         break;
 909                 case 2: /* AC_VI */
 910                         queue = 1;
 911                         if (acm)
 912                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 913                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 914                                 uapsd = true;
 915                         break;
 916                 case 3: /* AC_VO */
 917                         queue = 0;
 918                         if (acm)
 919                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 920                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 921                                 uapsd = true;
 922                         break;
 923                 case 0: /* AC_BE */
 924                 default:
 925                         queue = 2;
 926                         if (acm)
 927                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 928                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 929                                 uapsd = true;
 930                         break;
 931                 }
 932
 933                 params.aifs = pos[0] & 0x0f;
 934                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 935                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 936                 params.txop = get_unaligned_le16(pos + 2);
 937                 params.uapsd = uapsd;
 938
 939 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 940                 wiphy_debug(local->hw.wiphy,
 941                             "WMM queue=%d aci=%d acm=%d aifs=%d "
 942                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 943                             queue, aci, acm,
 944                             params.aifs, params.cw_min, params.cw_max,
 945                             params.txop, params.uapsd);
 946 #endif
 947                 sdata->tx_conf[queue] = params;
 948                 if (drv_conf_tx(local, sdata, queue, &params))
 949                         wiphy_debug(local->hw.wiphy,
 950                                     "failed to set TX queue parameters for queue %d\n",
 951                                     queue);
 952         }
 953
 954         /* enable WMM or activate new settings */
 955         sdata->vif.bss_conf.qos = true;
 956         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 957 }
 958
 959 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 960                                            u16 capab, bool erp_valid, u8 erp)
 961 {
 962         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 963         u32 changed = 0;
 964         bool use_protection;
 965         bool use_short_preamble;
 966         bool use_short_slot;
 967
 968         if (erp_valid) {
 969                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 970                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 971         } else {
 972                 use_protection = false;
 973                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 974         }
 975
 976         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 977         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 978                 use_short_slot = true;
 979
 980         if (use_protection != bss_conf->use_cts_prot) {
 981                 bss_conf->use_cts_prot = use_protection;
 982                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 983         }
 984
 985         if (use_short_preamble != bss_conf->use_short_preamble) {
 986                 bss_conf->use_short_preamble = use_short_preamble;
 987                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 988         }
 989
 990         if (use_short_slot != bss_conf->use_short_slot) {
 991                 bss_conf->use_short_slot = use_short_slot;
 992                 changed |= BSS_CHANGED_ERP_SLOT;
 993         }
 994
 995         return changed;
 996 }
 997
 998 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 999                                      struct cfg80211_bss *cbss,
1000                                      u32 bss_info_changed)
1001 {
1002         struct ieee80211_bss *bss = (void *)cbss->priv;
1003         struct ieee80211_local *local = sdata->local;
1004         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1005
1006         bss_info_changed |= BSS_CHANGED_ASSOC;
1007         /* set timing information */
1008         bss_conf->beacon_int = cbss->beacon_interval;
1009         bss_conf->timestamp = cbss->tsf;
1010
1011         bss_info_changed |= BSS_CHANGED_BEACON_INT;
1012         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1013                 cbss->capability, bss->has_erp_value, bss->erp_value);
1014
1015         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1016                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1017
1018         sdata->u.mgd.associated = cbss;
1019         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1020
1021         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1022
1023         /* just to be sure */
1024         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1025                                 IEEE80211_STA_BEACON_POLL);
1026
1027         ieee80211_led_assoc(local, 1);
1028
1029         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1030                 bss_conf->dtim_period = bss->dtim_period;
1031         else
1032                 bss_conf->dtim_period = 0;
1033
1034         bss_conf->assoc = 1;
1035         /*
1036          * For now just always ask the driver to update the basic rateset
1037          * when we have associated, we aren't checking whether it actually
1038          * changed or not.
1039          */
1040         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
1041
1042         /* And the BSSID changed - we're associated now */
1043         bss_info_changed |= BSS_CHANGED_BSSID;
1044
1045         /* Tell the driver to monitor connection quality (if supported) */
1046         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
1047             bss_conf->cqm_rssi_thold)
1048                 bss_info_changed |= BSS_CHANGED_CQM;
1049
1050         /* Enable ARP filtering */
1051         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1052                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1053                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1054         }
1055
1056         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1057
1058         mutex_lock(&local->iflist_mtx);
1059         ieee80211_recalc_ps(local, -1);
1060         ieee80211_recalc_smps(local);
1061         mutex_unlock(&local->iflist_mtx);
1062
1063         netif_tx_start_all_queues(sdata->dev);
1064         netif_carrier_on(sdata->dev);
1065 }
1066
1067 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1068                                    bool remove_sta, bool tx)
1069 {
1070         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1071         struct ieee80211_local *local = sdata->local;
1072         struct sta_info *sta;
1073         u32 changed = 0, config_changed = 0;
1074         u8 bssid[ETH_ALEN];
1075
1076         ASSERT_MGD_MTX(ifmgd);
1077
1078         if (WARN_ON(!ifmgd->associated))
1079                 return;
1080
1081         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1082
1083         ifmgd->associated = NULL;
1084         memset(ifmgd->bssid, 0, ETH_ALEN);
1085
1086         /*
1087          * we need to commit the associated = NULL change because the
1088          * scan code uses that to determine whether this iface should
1089          * go to/wake up from powersave or not -- and could otherwise
1090          * wake the queues erroneously.
1091          */
1092         smp_mb();
1093
1094         /*
1095          * Thus, we can only afterwards stop the queues -- to account
1096          * for the case where another CPU is finishing a scan at this
1097          * time -- we don't want the scan code to enable queues.
1098          */
1099
1100         netif_tx_stop_all_queues(sdata->dev);
1101         netif_carrier_off(sdata->dev);
1102
1103         mutex_lock(&local->sta_mtx);
1104         sta = sta_info_get(sdata, bssid);
1105         if (sta) {
1106                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1107                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1108         }
1109         mutex_unlock(&local->sta_mtx);
1110
1111         changed |= ieee80211_reset_erp_info(sdata);
1112
1113         ieee80211_led_assoc(local, 0);
1114         changed |= BSS_CHANGED_ASSOC;
1115         sdata->vif.bss_conf.assoc = false;
1116
1117         ieee80211_set_wmm_default(sdata);
1118
1119         /* channel(_type) changes are handled by ieee80211_hw_config */
1120         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1121
1122         /* on the next assoc, re-program HT parameters */
1123         sdata->ht_opmode_valid = false;
1124         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1125         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1126
1127         local->power_constr_level = 0;
1128
1129         del_timer_sync(&local->dynamic_ps_timer);
1130         cancel_work_sync(&local->dynamic_ps_enable_work);
1131
1132         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1133                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1134                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1135         }
1136         local->ps_sdata = NULL;
1137
1138         ieee80211_hw_config(local, config_changed);
1139
1140         /* Disable ARP filtering */
1141         if (sdata->vif.bss_conf.arp_filter_enabled) {
1142                 sdata->vif.bss_conf.arp_filter_enabled = false;
1143                 changed |= BSS_CHANGED_ARP_FILTER;
1144         }
1145
1146         /* The BSSID (not really interesting) and HT changed */
1147         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1148         ieee80211_bss_info_change_notify(sdata, changed);
1149
1150         /* remove AP and TDLS peers */
1151         if (remove_sta)
1152                 sta_info_flush(local, sdata);
1153
1154         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1155         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1156         del_timer_sync(&sdata->u.mgd.timer);
1157         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1158 }
1159
1160 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1161                              struct ieee80211_hdr *hdr)
1162 {
1163         /*
1164          * We can postpone the mgd.timer whenever receiving unicast frames
1165          * from AP because we know that the connection is working both ways
1166          * at that time. But multicast frames (and hence also beacons) must
1167          * be ignored here, because we need to trigger the timer during
1168          * data idle periods for sending the periodic probe request to the
1169          * AP we're connected to.
1170          */
1171         if (is_multicast_ether_addr(hdr->addr1))
1172                 return;
1173
1174         ieee80211_sta_reset_conn_monitor(sdata);
1175 }
1176
1177 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1178 {
1179         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1180
1181         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1182                               IEEE80211_STA_CONNECTION_POLL)))
1183             return;
1184
1185         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1186                           IEEE80211_STA_BEACON_POLL);
1187         mutex_lock(&sdata->local->iflist_mtx);
1188         ieee80211_recalc_ps(sdata->local, -1);
1189         mutex_unlock(&sdata->local->iflist_mtx);
1190
1191         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1192                 return;
1193
1194         /*
1195          * We've received a probe response, but are not sure whether
1196          * we have or will be receiving any beacons or data, so let's
1197          * schedule the timers again, just in case.
1198          */
1199         ieee80211_sta_reset_beacon_monitor(sdata);
1200
1201         mod_timer(&ifmgd->conn_mon_timer,
1202                   round_jiffies_up(jiffies +
1203                                    IEEE80211_CONNECTION_IDLE_TIME));
1204 }
1205
1206 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1207                              struct ieee80211_hdr *hdr, bool ack)
1208 {
1209         if (!ieee80211_is_data(hdr->frame_control))
1210             return;
1211
1212         if (ack)
1213                 ieee80211_sta_reset_conn_monitor(sdata);
1214
1215         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1216             sdata->u.mgd.probe_send_count > 0) {
1217                 if (ack)
1218                         sdata->u.mgd.probe_send_count = 0;
1219                 else
1220                         sdata->u.mgd.nullfunc_failed = true;
1221                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1222         }
1223 }
1224
1225 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1226 {
1227         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1228         const u8 *ssid;
1229         u8 *dst = ifmgd->associated->bssid;
1230         u8 unicast_limit = max(1, max_probe_tries - 3);
1231
1232         /*
1233          * Try sending broadcast probe requests for the last three
1234          * probe requests after the first ones failed since some
1235          * buggy APs only support broadcast probe requests.
1236          */
1237         if (ifmgd->probe_send_count >= unicast_limit)
1238                 dst = NULL;
1239
1240         /*
1241          * When the hardware reports an accurate Tx ACK status, it's
1242          * better to send a nullfunc frame instead of a probe request,
1243          * as it will kick us off the AP quickly if we aren't associated
1244          * anymore. The timeout will be reset if the frame is ACKed by
1245          * the AP.
1246          */
1247         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1248                 ifmgd->nullfunc_failed = false;
1249                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1250         } else {
1251                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1252                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0,
1253                                          (u32) -1, true, false);
1254         }
1255
1256         ifmgd->probe_send_count++;
1257         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1258         run_again(ifmgd, ifmgd->probe_timeout);
1259 }
1260
1261 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1262                                    bool beacon)
1263 {
1264         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1265         bool already = false;
1266
1267         if (!ieee80211_sdata_running(sdata))
1268                 return;
1269
1270         if (sdata->local->scanning)
1271                 return;
1272
1273         if (sdata->local->tmp_channel)
1274                 return;
1275
1276         mutex_lock(&ifmgd->mtx);
1277
1278         if (!ifmgd->associated)
1279                 goto out;
1280
1281 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1282         if (beacon && net_ratelimit())
1283                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1284                        "- sending probe request\n", sdata->name);
1285 #endif
1286
1287         /*
1288          * The driver/our work has already reported this event or the
1289          * connection monitoring has kicked in and we have already sent
1290          * a probe request. Or maybe the AP died and the driver keeps
1291          * reporting until we disassociate...
1292          *
1293          * In either case we have to ignore the current call to this
1294          * function (except for setting the correct probe reason bit)
1295          * because otherwise we would reset the timer every time and
1296          * never check whether we received a probe response!
1297          */
1298         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1299                             IEEE80211_STA_CONNECTION_POLL))
1300                 already = true;
1301
1302         if (beacon)
1303                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1304         else
1305                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1306
1307         if (already)
1308                 goto out;
1309
1310         mutex_lock(&sdata->local->iflist_mtx);
1311         ieee80211_recalc_ps(sdata->local, -1);
1312         mutex_unlock(&sdata->local->iflist_mtx);
1313
1314         ifmgd->probe_send_count = 0;
1315         ieee80211_mgd_probe_ap_send(sdata);
1316  out:
1317         mutex_unlock(&ifmgd->mtx);
1318 }
1319
1320 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1321                                           struct ieee80211_vif *vif)
1322 {
1323         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1324         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1325         struct sk_buff *skb;
1326         const u8 *ssid;
1327
1328         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1329                 return NULL;
1330
1331         ASSERT_MGD_MTX(ifmgd);
1332
1333         if (!ifmgd->associated)
1334                 return NULL;
1335
1336         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1337         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1338                                         (u32) -1, ssid + 2, ssid[1],
1339                                         NULL, 0, true);
1340
1341         return skb;
1342 }
1343 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1344
1345 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1346 {
1347         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1348         struct ieee80211_local *local = sdata->local;
1349         u8 bssid[ETH_ALEN];
1350
1351         mutex_lock(&ifmgd->mtx);
1352         if (!ifmgd->associated) {
1353                 mutex_unlock(&ifmgd->mtx);
1354                 return;
1355         }
1356
1357         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1358
1359         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1360                sdata->name, bssid);
1361
1362         ieee80211_set_disassoc(sdata, true, true);
1363         mutex_unlock(&ifmgd->mtx);
1364
1365         /*
1366          * must be outside lock due to cfg80211,
1367          * but that's not a problem.
1368          */
1369         ieee80211_send_deauth_disassoc(sdata, bssid,
1370                                        IEEE80211_STYPE_DEAUTH,
1371                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1372                                        NULL, true);
1373
1374         mutex_lock(&local->mtx);
1375         ieee80211_recalc_idle(local);
1376         mutex_unlock(&local->mtx);
1377 }
1378
1379 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1380 {
1381         struct ieee80211_sub_if_data *sdata =
1382                 container_of(work, struct ieee80211_sub_if_data,
1383                              u.mgd.beacon_connection_loss_work);
1384
1385         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1386                 __ieee80211_connection_loss(sdata);
1387         else
1388                 ieee80211_mgd_probe_ap(sdata, true);
1389 }
1390
1391 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1392 {
1393         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1394         struct ieee80211_hw *hw = &sdata->local->hw;
1395
1396         trace_api_beacon_loss(sdata);
1397
1398         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1399         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1400 }
1401 EXPORT_SYMBOL(ieee80211_beacon_loss);
1402
1403 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1404 {
1405         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1406         struct ieee80211_hw *hw = &sdata->local->hw;
1407
1408         trace_api_connection_loss(sdata);
1409
1410         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1411         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1412 }
1413 EXPORT_SYMBOL(ieee80211_connection_loss);
1414
1415
1416 static enum rx_mgmt_action __must_check
1417 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1418                          struct ieee80211_mgmt *mgmt, size_t len)
1419 {
1420         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1421         const u8 *bssid = NULL;
1422         u16 reason_code;
1423
1424         if (len < 24 + 2)
1425                 return RX_MGMT_NONE;
1426
1427         ASSERT_MGD_MTX(ifmgd);
1428
1429         bssid = ifmgd->associated->bssid;
1430
1431         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1432
1433         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1434                         sdata->name, bssid, reason_code);
1435
1436         ieee80211_set_disassoc(sdata, true, false);
1437         mutex_lock(&sdata->local->mtx);
1438         ieee80211_recalc_idle(sdata->local);
1439         mutex_unlock(&sdata->local->mtx);
1440
1441         return RX_MGMT_CFG80211_DEAUTH;
1442 }
1443
1444
1445 static enum rx_mgmt_action __must_check
1446 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1447                            struct ieee80211_mgmt *mgmt, size_t len)
1448 {
1449         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1450         u16 reason_code;
1451
1452         if (len < 24 + 2)
1453                 return RX_MGMT_NONE;
1454
1455         ASSERT_MGD_MTX(ifmgd);
1456
1457         if (WARN_ON(!ifmgd->associated))
1458                 return RX_MGMT_NONE;
1459
1460         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1461                 return RX_MGMT_NONE;
1462
1463         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1464
1465         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1466                         sdata->name, mgmt->sa, reason_code);
1467
1468         ieee80211_set_disassoc(sdata, true, false);
1469         mutex_lock(&sdata->local->mtx);
1470         ieee80211_recalc_idle(sdata->local);
1471         mutex_unlock(&sdata->local->mtx);
1472         return RX_MGMT_CFG80211_DISASSOC;
1473 }
1474
1475 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1476                                 u8 *supp_rates, unsigned int supp_rates_len,
1477                                 u32 *rates, u32 *basic_rates,
1478                                 bool *have_higher_than_11mbit,
1479                                 int *min_rate, int *min_rate_index)
1480 {
1481         int i, j;
1482
1483         for (i = 0; i < supp_rates_len; i++) {
1484                 int rate = (supp_rates[i] & 0x7f) * 5;
1485                 bool is_basic = !!(supp_rates[i] & 0x80);
1486
1487                 if (rate > 110)
1488                         *have_higher_than_11mbit = true;
1489
1490                 /*
1491                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1492                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1493                  *
1494                  * Note: Even through the membership selector and the basic
1495                  *       rate flag share the same bit, they are not exactly
1496                  *       the same.
1497                  */
1498                 if (!!(supp_rates[i] & 0x80) &&
1499                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1500                         continue;
1501
1502                 for (j = 0; j < sband->n_bitrates; j++) {
1503                         if (sband->bitrates[j].bitrate == rate) {
1504                                 *rates |= BIT(j);
1505                                 if (is_basic)
1506                                         *basic_rates |= BIT(j);
1507                                 if (rate < *min_rate) {
1508                                         *min_rate = rate;
1509                                         *min_rate_index = j;
1510                                 }
1511                                 break;
1512                         }
1513                 }
1514         }
1515 }
1516
1517 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1518                                     struct ieee80211_mgmt *mgmt, size_t len)
1519 {
1520         struct ieee80211_sub_if_data *sdata = wk->sdata;
1521         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1522         struct ieee80211_local *local = sdata->local;
1523         struct ieee80211_supported_band *sband;
1524         struct sta_info *sta;
1525         struct cfg80211_bss *cbss = wk->assoc.bss;
1526         u8 *pos;
1527         u32 rates, basic_rates;
1528         u16 capab_info, aid;
1529         struct ieee802_11_elems elems;
1530         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1531         u32 changed = 0;
1532         int err;
1533         bool have_higher_than_11mbit = false;
1534         u16 ap_ht_cap_flags;
1535         int min_rate = INT_MAX, min_rate_index = -1;
1536
1537         /* AssocResp and ReassocResp have identical structure */
1538
1539         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1540         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1541
1542         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1543                 printk(KERN_DEBUG
1544                        "%s: invalid AID value 0x%x; bits 15:14 not set\n",
1545                        sdata->name, aid);
1546         aid &= ~(BIT(15) | BIT(14));
1547
1548         ifmgd->broken_ap = false;
1549
1550         if (aid == 0 || aid > IEEE80211_MAX_AID) {
1551                 printk(KERN_DEBUG
1552                        "%s: invalid AID value %d (out of range), turn off PS\n",
1553                        sdata->name, aid);
1554                 aid = 0;
1555                 ifmgd->broken_ap = true;
1556         }
1557
1558         pos = mgmt->u.assoc_resp.variable;
1559         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1560
1561         if (!elems.supp_rates) {
1562                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1563                        sdata->name);
1564                 return false;
1565         }
1566
1567         ifmgd->aid = aid;
1568
1569         mutex_lock(&sdata->local->sta_mtx);
1570         /*
1571          * station info was already allocated and inserted before
1572          * the association and should be available to us
1573          */
1574         sta = sta_info_get_rx(sdata, cbss->bssid);
1575         if (WARN_ON(!sta)) {
1576                 mutex_unlock(&sdata->local->sta_mtx);
1577                 return false;
1578         }
1579
1580         sta_info_move_state(sta, IEEE80211_STA_AUTH);
1581         sta_info_move_state(sta, IEEE80211_STA_ASSOC);
1582         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1583                 sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
1584
1585         rates = 0;
1586         basic_rates = 0;
1587         sband = local->hw.wiphy->bands[wk->chan->band];
1588
1589         ieee80211_get_rates(sband, elems.supp_rates, elems.supp_rates_len,
1590                             &rates, &basic_rates, &have_higher_than_11mbit,
1591                             &min_rate, &min_rate_index);
1592
1593         ieee80211_get_rates(sband, elems.ext_supp_rates,
1594                             elems.ext_supp_rates_len, &rates, &basic_rates,
1595                             &have_higher_than_11mbit,
1596                             &min_rate, &min_rate_index);
1597
1598         /*
1599          * some buggy APs don't advertise basic_rates. use the lowest
1600          * supported rate instead.
1601          */
1602         if (unlikely(!basic_rates) && min_rate_index >= 0) {
1603                 printk(KERN_DEBUG "%s: No basic rates in AssocResp. "
1604                        "Using min supported rate instead.\n", sdata->name);
1605                 basic_rates = BIT(min_rate_index);
1606         }
1607
1608         sta->sta.supp_rates[wk->chan->band] = rates;
1609         sdata->vif.bss_conf.basic_rates = basic_rates;
1610
1611         /* cf. IEEE 802.11 9.2.12 */
1612         if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1613             have_higher_than_11mbit)
1614                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1615         else
1616                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1617
1618         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1619                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1620                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1621
1622         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1623
1624         rate_control_rate_init(sta);
1625
1626         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1627                 set_sta_flag(sta, WLAN_STA_MFP);
1628
1629         if (elems.wmm_param)
1630                 set_sta_flag(sta, WLAN_STA_WME);
1631
1632         /* sta_info_reinsert will also unlock the mutex lock */
1633         err = sta_info_reinsert(sta);
1634         sta = NULL;
1635         if (err) {
1636                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1637                        " the AP (error %d)\n", sdata->name, err);
1638                 return false;
1639         }
1640
1641         /*
1642          * Always handle WMM once after association regardless
1643          * of the first value the AP uses. Setting -1 here has
1644          * that effect because the AP values is an unsigned
1645          * 4-bit value.
1646          */
1647         ifmgd->wmm_last_param_set = -1;
1648
1649         if (elems.wmm_param)
1650                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1651                                          elems.wmm_param_len);
1652         else
1653                 ieee80211_set_wmm_default(sdata);
1654
1655         local->oper_channel = wk->chan;
1656
1657         if (elems.ht_info_elem && elems.wmm_param &&
1658             (sdata->local->hw.queues >= 4) &&
1659             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1660                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1661                                                cbss->bssid, ap_ht_cap_flags,
1662                                                false);
1663
1664         /* set AID and assoc capability,
1665          * ieee80211_set_associated() will tell the driver */
1666         bss_conf->aid = aid;
1667         bss_conf->assoc_capability = capab_info;
1668         ieee80211_set_associated(sdata, cbss, changed);
1669
1670         /*
1671          * If we're using 4-addr mode, let the AP know that we're
1672          * doing so, so that it can create the STA VLAN on its side
1673          */
1674         if (ifmgd->use_4addr)
1675                 ieee80211_send_4addr_nullfunc(local, sdata);
1676
1677         /*
1678          * Start timer to probe the connection to the AP now.
1679          * Also start the timer that will detect beacon loss.
1680          */
1681         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1682         ieee80211_sta_reset_beacon_monitor(sdata);
1683
1684         return true;
1685 }
1686
1687
1688 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1689                                   struct ieee80211_mgmt *mgmt,
1690                                   size_t len,
1691                                   struct ieee80211_rx_status *rx_status,
1692                                   struct ieee802_11_elems *elems,
1693                                   bool beacon)
1694 {
1695         struct ieee80211_local *local = sdata->local;
1696         int freq;
1697         struct ieee80211_bss *bss;
1698         struct ieee80211_channel *channel;
1699         bool need_ps = false;
1700
1701         if (sdata->u.mgd.associated) {
1702                 bss = (void *)sdata->u.mgd.associated->priv;
1703                 /* not previously set so we may need to recalc */
1704                 need_ps = !bss->dtim_period;
1705         }
1706
1707         if (elems->ds_params && elems->ds_params_len == 1)
1708                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1709                                                       rx_status->band);
1710         else
1711                 freq = rx_status->freq;
1712
1713         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1714
1715         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1716                 return;
1717
1718         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1719                                         channel, beacon);
1720         if (bss)
1721                 ieee80211_rx_bss_put(local, bss);
1722
1723         if (!sdata->u.mgd.associated)
1724                 return;
1725
1726         if (need_ps) {
1727                 mutex_lock(&local->iflist_mtx);
1728                 ieee80211_recalc_ps(local, -1);
1729                 mutex_unlock(&local->iflist_mtx);
1730         }
1731
1732         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1733             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1734                                                         ETH_ALEN) == 0)) {
1735                 struct ieee80211_channel_sw_ie *sw_elem =
1736                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1737                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1738                                                  bss, rx_status->mactime);
1739         }
1740 }
1741
1742
1743 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1744                                          struct sk_buff *skb)
1745 {
1746         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1747         struct ieee80211_if_managed *ifmgd;
1748         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1749         size_t baselen, len = skb->len;
1750         struct ieee802_11_elems elems;
1751
1752         ifmgd = &sdata->u.mgd;
1753
1754         ASSERT_MGD_MTX(ifmgd);
1755
1756         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1757                 return; /* ignore ProbeResp to foreign address */
1758
1759         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1760         if (baselen > len)
1761                 return;
1762
1763         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1764                                 &elems);
1765
1766         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1767
1768         if (ifmgd->associated &&
1769             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1770                 ieee80211_reset_ap_probe(sdata);
1771 }
1772
1773 /*
1774  * This is the canonical list of information elements we care about,
1775  * the filter code also gives us all changes to the Microsoft OUI
1776  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1777  *
1778  * We implement beacon filtering in software since that means we can
1779  * avoid processing the frame here and in cfg80211, and userspace
1780  * will not be able to tell whether the hardware supports it or not.
1781  *
1782  * XXX: This list needs to be dynamic -- userspace needs to be able to
1783  *      add items it requires. It also needs to be able to tell us to
1784  *      look out for other vendor IEs.
1785  */
1786 static const u64 care_about_ies =
1787         (1ULL << WLAN_EID_COUNTRY) |
1788         (1ULL << WLAN_EID_ERP_INFO) |
1789         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1790         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1791         (1ULL << WLAN_EID_HT_CAPABILITY) |
1792         (1ULL << WLAN_EID_HT_INFORMATION);
1793
1794 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1795                                      struct ieee80211_mgmt *mgmt,
1796                                      size_t len,
1797                                      struct ieee80211_rx_status *rx_status)
1798 {
1799         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1800         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1801         size_t baselen;
1802         struct ieee802_11_elems elems;
1803         struct ieee80211_local *local = sdata->local;
1804         u32 changed = 0;
1805         bool erp_valid, directed_tim = false;
1806         u8 erp_value = 0;
1807         u32 ncrc;
1808         u8 *bssid;
1809
1810         ASSERT_MGD_MTX(ifmgd);
1811
1812         /* Process beacon from the current BSS */
1813         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1814         if (baselen > len)
1815                 return;
1816
1817         if (rx_status->freq != local->hw.conf.channel->center_freq)
1818                 return;
1819
1820         /*
1821          * We might have received a number of frames, among them a
1822          * disassoc frame and a beacon...
1823          */
1824         if (!ifmgd->associated)
1825                 return;
1826
1827         bssid = ifmgd->associated->bssid;
1828
1829         /*
1830          * And in theory even frames from a different AP we were just
1831          * associated to a split-second ago!
1832          */
1833         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1834                 return;
1835
1836         /* Track average RSSI from the Beacon frames of the current AP */
1837         ifmgd->last_beacon_signal = rx_status->signal;
1838         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1839                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1840                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1841                 ifmgd->last_cqm_event_signal = 0;
1842                 ifmgd->count_beacon_signal = 1;
1843                 ifmgd->last_ave_beacon_signal = 0;
1844         } else {
1845                 ifmgd->ave_beacon_signal =
1846                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1847                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1848                          ifmgd->ave_beacon_signal) / 16;
1849                 ifmgd->count_beacon_signal++;
1850         }
1851
1852         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
1853             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
1854                 int sig = ifmgd->ave_beacon_signal;
1855                 int last_sig = ifmgd->last_ave_beacon_signal;
1856
1857                 /*
1858                  * if signal crosses either of the boundaries, invoke callback
1859                  * with appropriate parameters
1860                  */
1861                 if (sig > ifmgd->rssi_max_thold &&
1862                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
1863                         ifmgd->last_ave_beacon_signal = sig;
1864                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
1865                 } else if (sig < ifmgd->rssi_min_thold &&
1866                            (last_sig >= ifmgd->rssi_max_thold ||
1867                            last_sig == 0)) {
1868                         ifmgd->last_ave_beacon_signal = sig;
1869                         drv_rssi_callback(local, RSSI_EVENT_LOW);
1870                 }
1871         }
1872
1873         if (bss_conf->cqm_rssi_thold &&
1874             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1875             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1876                 int sig = ifmgd->ave_beacon_signal / 16;
1877                 int last_event = ifmgd->last_cqm_event_signal;
1878                 int thold = bss_conf->cqm_rssi_thold;
1879                 int hyst = bss_conf->cqm_rssi_hyst;
1880                 if (sig < thold &&
1881                     (last_event == 0 || sig < last_event - hyst)) {
1882                         ifmgd->last_cqm_event_signal = sig;
1883                         ieee80211_cqm_rssi_notify(
1884                                 &sdata->vif,
1885                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1886                                 GFP_KERNEL);
1887                 } else if (sig > thold &&
1888                            (last_event == 0 || sig > last_event + hyst)) {
1889                         ifmgd->last_cqm_event_signal = sig;
1890                         ieee80211_cqm_rssi_notify(
1891                                 &sdata->vif,
1892                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1893                                 GFP_KERNEL);
1894                 }
1895         }
1896
1897         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1898 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1899                 if (net_ratelimit()) {
1900                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1901                                "to a received beacon\n", sdata->name);
1902                 }
1903 #endif
1904                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1905                 mutex_lock(&local->iflist_mtx);
1906                 ieee80211_recalc_ps(local, -1);
1907                 mutex_unlock(&local->iflist_mtx);
1908         }
1909
1910         /*
1911          * Push the beacon loss detection into the future since
1912          * we are processing a beacon from the AP just now.
1913          */
1914         ieee80211_sta_reset_beacon_monitor(sdata);
1915
1916         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1917         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1918                                           len - baselen, &elems,
1919                                           care_about_ies, ncrc);
1920
1921         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1922                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1923                                                    ifmgd->aid);
1924
1925         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1926                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1927                                       true);
1928
1929                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1930                                          elems.wmm_param_len);
1931         }
1932
1933         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1934                 if (directed_tim) {
1935                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1936                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1937                                 ieee80211_hw_config(local,
1938                                                     IEEE80211_CONF_CHANGE_PS);
1939                                 ieee80211_send_nullfunc(local, sdata, 0);
1940                         } else {
1941                                 local->pspolling = true;
1942
1943                                 /*
1944                                  * Here is assumed that the driver will be
1945                                  * able to send ps-poll frame and receive a
1946                                  * response even though power save mode is
1947                                  * enabled, but some drivers might require
1948                                  * to disable power save here. This needs
1949                                  * to be investigated.
1950                                  */
1951                                 ieee80211_send_pspoll(local, sdata);
1952                         }
1953                 }
1954         }
1955
1956         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1957                 return;
1958         ifmgd->beacon_crc = ncrc;
1959         ifmgd->beacon_crc_valid = true;
1960
1961         if (elems.erp_info && elems.erp_info_len >= 1) {
1962                 erp_valid = true;
1963                 erp_value = elems.erp_info[0];
1964         } else {
1965                 erp_valid = false;
1966         }
1967         changed |= ieee80211_handle_bss_capability(sdata,
1968                         le16_to_cpu(mgmt->u.beacon.capab_info),
1969                         erp_valid, erp_value);
1970
1971
1972         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1973             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1974                 struct sta_info *sta;
1975                 struct ieee80211_supported_band *sband;
1976                 u16 ap_ht_cap_flags;
1977
1978                 rcu_read_lock();
1979
1980                 sta = sta_info_get(sdata, bssid);
1981                 if (WARN_ON(!sta)) {
1982                         rcu_read_unlock();
1983                         return;
1984                 }
1985
1986                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1987
1988                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1989                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1990
1991                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1992
1993                 rcu_read_unlock();
1994
1995                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1996                                                bssid, ap_ht_cap_flags, true);
1997         }
1998
1999         /* Note: country IE parsing is done for us by cfg80211 */
2000         if (elems.country_elem) {
2001                 /* TODO: IBSS also needs this */
2002                 if (elems.pwr_constr_elem)
2003                         ieee80211_handle_pwr_constr(sdata,
2004                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2005                                 elems.pwr_constr_elem,
2006                                 elems.pwr_constr_elem_len);
2007         }
2008
2009         ieee80211_bss_info_change_notify(sdata, changed);
2010 }
2011
2012 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2013                                   struct sk_buff *skb)
2014 {
2015         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2016         struct ieee80211_rx_status *rx_status;
2017         struct ieee80211_mgmt *mgmt;
2018         enum rx_mgmt_action rma = RX_MGMT_NONE;
2019         u16 fc;
2020
2021         rx_status = (struct ieee80211_rx_status *) skb->cb;
2022         mgmt = (struct ieee80211_mgmt *) skb->data;
2023         fc = le16_to_cpu(mgmt->frame_control);
2024
2025         mutex_lock(&ifmgd->mtx);
2026
2027         if (ifmgd->associated &&
2028             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
2029                 switch (fc & IEEE80211_FCTL_STYPE) {
2030                 case IEEE80211_STYPE_BEACON:
2031                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
2032                                                  rx_status);
2033                         break;
2034                 case IEEE80211_STYPE_PROBE_RESP:
2035                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
2036                         break;
2037                 case IEEE80211_STYPE_DEAUTH:
2038                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2039                         break;
2040                 case IEEE80211_STYPE_DISASSOC:
2041                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2042                         break;
2043                 case IEEE80211_STYPE_ACTION:
2044                         switch (mgmt->u.action.category) {
2045                         case WLAN_CATEGORY_SPECTRUM_MGMT:
2046                                 ieee80211_sta_process_chanswitch(sdata,
2047                                                 &mgmt->u.action.u.chan_switch.sw_elem,
2048                                                 (void *)ifmgd->associated->priv,
2049                                                 rx_status->mactime);
2050                                 break;
2051                         }
2052                 }
2053                 mutex_unlock(&ifmgd->mtx);
2054
2055                 switch (rma) {
2056                 case RX_MGMT_NONE:
2057                         /* no action */
2058                         break;
2059                 case RX_MGMT_CFG80211_DEAUTH:
2060                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2061                         break;
2062                 case RX_MGMT_CFG80211_DISASSOC:
2063                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2064                         break;
2065                 default:
2066                         WARN(1, "unexpected: %d", rma);
2067                 }
2068                 return;
2069         }
2070
2071         mutex_unlock(&ifmgd->mtx);
2072
2073         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
2074             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
2075                 struct ieee80211_local *local = sdata->local;
2076                 struct ieee80211_work *wk;
2077
2078                 mutex_lock(&local->mtx);
2079                 list_for_each_entry(wk, &local->work_list, list) {
2080                         if (wk->sdata != sdata)
2081                                 continue;
2082
2083                         if (wk->type != IEEE80211_WORK_ASSOC &&
2084                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2085                                 continue;
2086
2087                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
2088                                 continue;
2089                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
2090                                 continue;
2091
2092                         /*
2093                          * Printing the message only here means we can't
2094                          * spuriously print it, but it also means that it
2095                          * won't be printed when the frame comes in before
2096                          * we even tried to associate or in similar cases.
2097                          *
2098                          * Ultimately, I suspect cfg80211 should print the
2099                          * messages instead.
2100                          */
2101                         printk(KERN_DEBUG
2102                                "%s: deauthenticated from %pM (Reason: %u)\n",
2103                                sdata->name, mgmt->bssid,
2104                                le16_to_cpu(mgmt->u.deauth.reason_code));
2105
2106                         list_del_rcu(&wk->list);
2107                         free_work(wk);
2108                         break;
2109                 }
2110                 mutex_unlock(&local->mtx);
2111
2112                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2113         }
2114 }
2115
2116 static void ieee80211_sta_timer(unsigned long data)
2117 {
2118         struct ieee80211_sub_if_data *sdata =
2119                 (struct ieee80211_sub_if_data *) data;
2120         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2121         struct ieee80211_local *local = sdata->local;
2122
2123         if (local->quiescing) {
2124                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2125                 return;
2126         }
2127
2128         ieee80211_queue_work(&local->hw, &sdata->work);
2129 }
2130
2131 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2132                                           u8 *bssid, u8 reason)
2133 {
2134         struct ieee80211_local *local = sdata->local;
2135         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2136
2137         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2138                           IEEE80211_STA_BEACON_POLL);
2139
2140         ieee80211_set_disassoc(sdata, true, true);
2141         mutex_unlock(&ifmgd->mtx);
2142         /*
2143          * must be outside lock due to cfg80211,
2144          * but that's not a problem.
2145          */
2146         ieee80211_send_deauth_disassoc(sdata, bssid,
2147                         IEEE80211_STYPE_DEAUTH, reason,
2148                         NULL, true);
2149
2150         mutex_lock(&local->mtx);
2151         ieee80211_recalc_idle(local);
2152         mutex_unlock(&local->mtx);
2153
2154         mutex_lock(&ifmgd->mtx);
2155 }
2156
2157 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2158 {
2159         struct ieee80211_local *local = sdata->local;
2160         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2161
2162         /* then process the rest of the work */
2163         mutex_lock(&ifmgd->mtx);
2164
2165         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2166                             IEEE80211_STA_CONNECTION_POLL) &&
2167             ifmgd->associated) {
2168                 u8 bssid[ETH_ALEN];
2169                 int max_tries;
2170
2171                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2172
2173                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2174                         max_tries = max_nullfunc_tries;
2175                 else
2176                         max_tries = max_probe_tries;
2177
2178                 /* ACK received for nullfunc probing frame */
2179                 if (!ifmgd->probe_send_count)
2180                         ieee80211_reset_ap_probe(sdata);
2181                 else if (ifmgd->nullfunc_failed) {
2182                         if (ifmgd->probe_send_count < max_tries) {
2183 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2184                                 wiphy_debug(local->hw.wiphy,
2185                                             "%s: No ack for nullfunc frame to"
2186                                             " AP %pM, try %d/%i\n",
2187                                             sdata->name, bssid,
2188                                             ifmgd->probe_send_count, max_tries);
2189 #endif
2190                                 ieee80211_mgd_probe_ap_send(sdata);
2191                         } else {
2192 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2193                                 wiphy_debug(local->hw.wiphy,
2194                                             "%s: No ack for nullfunc frame to"
2195                                             " AP %pM, disconnecting.\n",
2196                                             sdata->name, bssid);
2197 #endif
2198                                 ieee80211_sta_connection_lost(sdata, bssid,
2199                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2200                         }
2201                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2202                         run_again(ifmgd, ifmgd->probe_timeout);
2203                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2204 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2205                         wiphy_debug(local->hw.wiphy,
2206                                     "%s: Failed to send nullfunc to AP %pM"
2207                                     " after %dms, disconnecting.\n",
2208                                     sdata->name,
2209                                     bssid, probe_wait_ms);
2210 #endif
2211                         ieee80211_sta_connection_lost(sdata, bssid,
2212                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2213                 } else if (ifmgd->probe_send_count < max_tries) {
2214 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2215                         wiphy_debug(local->hw.wiphy,
2216                                     "%s: No probe response from AP %pM"
2217                                     " after %dms, try %d/%i\n",
2218                                     sdata->name,
2219                                     bssid, probe_wait_ms,
2220                                     ifmgd->probe_send_count, max_tries);
2221 #endif
2222                         ieee80211_mgd_probe_ap_send(sdata);
2223                 } else {
2224                         /*
2225                          * We actually lost the connection ... or did we?
2226                          * Let's make sure!
2227                          */
2228                         wiphy_debug(local->hw.wiphy,
2229                                     "%s: No probe response from AP %pM"
2230                                     " after %dms, disconnecting.\n",
2231                                     sdata->name,
2232                                     bssid, probe_wait_ms);
2233
2234                         ieee80211_sta_connection_lost(sdata, bssid,
2235                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2236                 }
2237         }
2238
2239         mutex_unlock(&ifmgd->mtx);
2240 }
2241
2242 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2243 {
2244         struct ieee80211_sub_if_data *sdata =
2245                 (struct ieee80211_sub_if_data *) data;
2246         struct ieee80211_local *local = sdata->local;
2247
2248         if (local->quiescing)
2249                 return;
2250
2251         ieee80211_queue_work(&sdata->local->hw,
2252                              &sdata->u.mgd.beacon_connection_loss_work);
2253 }
2254
2255 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2256 {
2257         struct ieee80211_sub_if_data *sdata =
2258                 (struct ieee80211_sub_if_data *) data;
2259         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2260         struct ieee80211_local *local = sdata->local;
2261
2262         if (local->quiescing)
2263                 return;
2264
2265         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2266 }
2267
2268 static void ieee80211_sta_monitor_work(struct work_struct *work)
2269 {
2270         struct ieee80211_sub_if_data *sdata =
2271                 container_of(work, struct ieee80211_sub_if_data,
2272                              u.mgd.monitor_work);
2273
2274         ieee80211_mgd_probe_ap(sdata, false);
2275 }
2276
2277 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2278 {
2279         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2280                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2281                                         IEEE80211_STA_CONNECTION_POLL);
2282
2283                 /* let's probe the connection once */
2284                 ieee80211_queue_work(&sdata->local->hw,
2285                            &sdata->u.mgd.monitor_work);
2286                 /* and do all the other regular work too */
2287                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2288         }
2289 }
2290
2291 #ifdef CONFIG_PM
2292 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2293 {
2294         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2295
2296         /*
2297          * we need to use atomic bitops for the running bits
2298          * only because both timers might fire at the same
2299          * time -- the code here is properly synchronised.
2300          */
2301
2302         cancel_work_sync(&ifmgd->request_smps_work);
2303
2304         cancel_work_sync(&ifmgd->monitor_work);
2305         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2306         if (del_timer_sync(&ifmgd->timer))
2307                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2308
2309         cancel_work_sync(&ifmgd->chswitch_work);
2310         if (del_timer_sync(&ifmgd->chswitch_timer))
2311                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2312
2313         /* these will just be re-established on connection */
2314         del_timer_sync(&ifmgd->conn_mon_timer);
2315         del_timer_sync(&ifmgd->bcn_mon_timer);
2316 }
2317
2318 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2319 {
2320         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2321
2322         if (!ifmgd->associated)
2323                 return;
2324
2325         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2326                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2327                 mutex_lock(&ifmgd->mtx);
2328                 if (ifmgd->associated) {
2329 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2330                         wiphy_debug(sdata->local->hw.wiphy,
2331                                     "%s: driver requested disconnect after resume.\n",
2332                                     sdata->name);
2333 #endif
2334                         ieee80211_sta_connection_lost(sdata,
2335                                 ifmgd->associated->bssid,
2336                                 WLAN_REASON_UNSPECIFIED);
2337                         mutex_unlock(&ifmgd->mtx);
2338                         return;
2339                 }
2340                 mutex_unlock(&ifmgd->mtx);
2341         }
2342
2343         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2344                 add_timer(&ifmgd->timer);
2345         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2346                 add_timer(&ifmgd->chswitch_timer);
2347         ieee80211_sta_reset_beacon_monitor(sdata);
2348         ieee80211_restart_sta_timer(sdata);
2349         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.monitor_work);
2350 }
2351 #endif
2352
2353 /* interface setup */
2354 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2355 {
2356         struct ieee80211_if_managed *ifmgd;
2357
2358         ifmgd = &sdata->u.mgd;
2359         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2360         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2361         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2362                   ieee80211_beacon_connection_loss_work);
2363         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2364         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2365                     (unsigned long) sdata);
2366         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2367                     (unsigned long) sdata);
2368         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2369                     (unsigned long) sdata);
2370         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2371                     (unsigned long) sdata);
2372
2373         ifmgd->flags = 0;
2374         ifmgd->powersave = sdata->wdev.ps;
2375
2376         mutex_init(&ifmgd->mtx);
2377
2378         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2379                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2380         else
2381                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2382 }
2383
2384 /* scan finished notification */
2385 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2386 {
2387         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2388
2389         /* Restart STA timers */
2390         rcu_read_lock();
2391         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2392                 ieee80211_restart_sta_timer(sdata);
2393         rcu_read_unlock();
2394 }
2395
2396 int ieee80211_max_network_latency(struct notifier_block *nb,
2397                                   unsigned long data, void *dummy)
2398 {
2399         s32 latency_usec = (s32) data;
2400         struct ieee80211_local *local =
2401                 container_of(nb, struct ieee80211_local,
2402                              network_latency_notifier);
2403
2404         mutex_lock(&local->iflist_mtx);
2405         ieee80211_recalc_ps(local, latency_usec);
2406         mutex_unlock(&local->iflist_mtx);
2407
2408         return 0;
2409 }
2410
2411 /* config hooks */
2412 static enum work_done_result
2413 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2414                           struct sk_buff *skb)
2415 {
2416         struct ieee80211_local *local = wk->sdata->local;
2417
2418         if (!skb) {
2419                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2420                 goto destroy;
2421         }
2422
2423         if (wk->type == IEEE80211_WORK_AUTH) {
2424                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2425                 goto destroy;
2426         }
2427
2428         mutex_lock(&wk->sdata->u.mgd.mtx);
2429         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2430         mutex_unlock(&wk->sdata->u.mgd.mtx);
2431
2432         wk->type = IEEE80211_WORK_AUTH;
2433         wk->probe_auth.tries = 0;
2434         return WORK_DONE_REQUEUE;
2435  destroy:
2436         if (wk->probe_auth.synced)
2437                 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2438                                    IEEE80211_TX_SYNC_AUTH);
2439
2440         return WORK_DONE_DESTROY;
2441 }
2442
2443 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2444                        struct cfg80211_auth_request *req)
2445 {
2446         const u8 *ssid;
2447         struct ieee80211_work *wk;
2448         u16 auth_alg;
2449
2450         if (req->local_state_change)
2451                 return 0; /* no need to update mac80211 state */
2452
2453         switch (req->auth_type) {
2454         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2455                 auth_alg = WLAN_AUTH_OPEN;
2456                 break;
2457         case NL80211_AUTHTYPE_SHARED_KEY:
2458                 if (IS_ERR(sdata->local->wep_tx_tfm))
2459                         return -EOPNOTSUPP;
2460                 auth_alg = WLAN_AUTH_SHARED_KEY;
2461                 break;
2462         case NL80211_AUTHTYPE_FT:
2463                 auth_alg = WLAN_AUTH_FT;
2464                 break;
2465         case NL80211_AUTHTYPE_NETWORK_EAP:
2466                 auth_alg = WLAN_AUTH_LEAP;
2467                 break;
2468         default:
2469                 return -EOPNOTSUPP;
2470         }
2471
2472         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2473         if (!wk)
2474                 return -ENOMEM;
2475
2476         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2477
2478         if (req->ie && req->ie_len) {
2479                 memcpy(wk->ie, req->ie, req->ie_len);
2480                 wk->ie_len = req->ie_len;
2481         }
2482
2483         if (req->key && req->key_len) {
2484                 wk->probe_auth.key_len = req->key_len;
2485                 wk->probe_auth.key_idx = req->key_idx;
2486                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2487         }
2488
2489         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2490         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2491         wk->probe_auth.ssid_len = ssid[1];
2492
2493         wk->probe_auth.algorithm = auth_alg;
2494         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2495
2496         /* if we already have a probe, don't probe again */
2497         if (req->bss->proberesp_ies)
2498                 wk->type = IEEE80211_WORK_AUTH;
2499         else
2500                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2501         wk->chan = req->bss->channel;
2502         wk->chan_type = NL80211_CHAN_NO_HT;
2503         wk->sdata = sdata;
2504         wk->done = ieee80211_probe_auth_done;
2505
2506         ieee80211_add_work(wk);
2507         return 0;
2508 }
2509
2510 /* create and insert a dummy station entry */
2511 static int ieee80211_pre_assoc(struct ieee80211_sub_if_data *sdata,
2512                                 u8 *bssid) {
2513         struct sta_info *sta;
2514         int err;
2515
2516         sta = sta_info_alloc(sdata, bssid, GFP_KERNEL);
2517         if (!sta)
2518                 return -ENOMEM;
2519
2520         sta->dummy = true;
2521
2522         err = sta_info_insert(sta);
2523         sta = NULL;
2524         if (err) {
2525                 printk(KERN_DEBUG "%s: failed to insert Dummy STA entry for"
2526                        " the AP (error %d)\n", sdata->name, err);
2527                 return err;
2528         }
2529
2530         return 0;
2531 }
2532
2533 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2534                                                   struct sk_buff *skb)
2535 {
2536         struct ieee80211_local *local = wk->sdata->local;
2537         struct ieee80211_mgmt *mgmt;
2538         struct ieee80211_rx_status *rx_status;
2539         struct ieee802_11_elems elems;
2540         struct cfg80211_bss *cbss = wk->assoc.bss;
2541         u16 status;
2542
2543         if (!skb) {
2544                 sta_info_destroy_addr(wk->sdata, cbss->bssid);
2545                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2546                 goto destroy;
2547         }
2548
2549         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2550                 mutex_lock(&wk->sdata->u.mgd.mtx);
2551                 rx_status = (void *) skb->cb;
2552                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2553                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2554                                       &elems, true);
2555                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2556
2557                 wk->type = IEEE80211_WORK_ASSOC;
2558                 /* not really done yet */
2559                 return WORK_DONE_REQUEUE;
2560         }
2561
2562         mgmt = (void *)skb->data;
2563         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2564
2565         if (status == WLAN_STATUS_SUCCESS) {
2566                 if (wk->assoc.synced)
2567                         drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2568                                            IEEE80211_TX_SYNC_ASSOC);
2569
2570                 mutex_lock(&wk->sdata->u.mgd.mtx);
2571                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2572                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2573                         /* oops -- internal error -- send timeout for now */
2574                         sta_info_destroy_addr(wk->sdata, cbss->bssid);
2575                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2576                                                     wk->filter_ta);
2577                         return WORK_DONE_DESTROY;
2578                 }
2579
2580                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2581         } else {
2582                 /* assoc failed - destroy the dummy station entry */
2583                 sta_info_destroy_addr(wk->sdata, cbss->bssid);
2584         }
2585
2586         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2587  destroy:
2588         if (wk->assoc.synced)
2589                 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2590                                    IEEE80211_TX_SYNC_ASSOC);
2591
2592         return WORK_DONE_DESTROY;
2593 }
2594
2595 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2596                         struct cfg80211_assoc_request *req)
2597 {
2598         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2599         struct ieee80211_bss *bss = (void *)req->bss->priv;
2600         struct ieee80211_work *wk;
2601         const u8 *ssid;
2602         int i, err;
2603
2604         mutex_lock(&ifmgd->mtx);
2605         if (ifmgd->associated) {
2606                 if (!req->prev_bssid ||
2607                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2608                            ETH_ALEN)) {
2609                         /*
2610                          * We are already associated and the request was not a
2611                          * reassociation request from the current BSS, so
2612                          * reject it.
2613                          */
2614                         mutex_unlock(&ifmgd->mtx);
2615                         return -EALREADY;
2616                 }
2617
2618                 /* Trying to reassociate - clear previous association state */
2619                 ieee80211_set_disassoc(sdata, true, false);
2620         }
2621         mutex_unlock(&ifmgd->mtx);
2622
2623         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2624         if (!wk)
2625                 return -ENOMEM;
2626
2627         /*
2628          * create a dummy station info entry in order
2629          * to start accepting incoming EAPOL packets from the station
2630          */
2631         err = ieee80211_pre_assoc(sdata, req->bss->bssid);
2632         if (err) {
2633                 kfree(wk);
2634                 return err;
2635         }
2636
2637         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2638         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2639
2640         ifmgd->beacon_crc_valid = false;
2641
2642         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2643                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2644                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2645                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2646                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2647
2648
2649         if (req->flags & ASSOC_REQ_DISABLE_HT)
2650                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2651
2652         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
2653         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
2654                sizeof(ifmgd->ht_capa_mask));
2655
2656         if (req->ie && req->ie_len) {
2657                 memcpy(wk->ie, req->ie, req->ie_len);
2658                 wk->ie_len = req->ie_len;
2659         } else
2660                 wk->ie_len = 0;
2661
2662         wk->assoc.bss = req->bss;
2663
2664         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2665
2666         /* new association always uses requested smps mode */
2667         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2668                 if (ifmgd->powersave)
2669                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2670                 else
2671                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2672         } else
2673                 ifmgd->ap_smps = ifmgd->req_smps;
2674
2675         wk->assoc.smps = ifmgd->ap_smps;
2676         /*
2677          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2678          * We still associate in non-HT mode (11a/b/g) if any one of these
2679          * ciphers is configured as pairwise.
2680          * We can set this to true for non-11n hardware, that'll be checked
2681          * separately along with the peer capabilities.
2682          */
2683         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2684         wk->assoc.capability = req->bss->capability;
2685         wk->assoc.wmm_used = bss->wmm_used;
2686         wk->assoc.supp_rates = bss->supp_rates;
2687         wk->assoc.supp_rates_len = bss->supp_rates_len;
2688         wk->assoc.ht_information_ie =
2689                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2690
2691         if (bss->wmm_used && bss->uapsd_supported &&
2692             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2693                 wk->assoc.uapsd_used = true;
2694                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2695         } else {
2696                 wk->assoc.uapsd_used = false;
2697                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2698         }
2699
2700         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2701         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2702         wk->assoc.ssid_len = ssid[1];
2703
2704         if (req->prev_bssid)
2705                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2706
2707         wk->chan = req->bss->channel;
2708         wk->chan_type = NL80211_CHAN_NO_HT;
2709         wk->sdata = sdata;
2710         wk->done = ieee80211_assoc_done;
2711         if (!bss->dtim_period &&
2712             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2713                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2714         else
2715                 wk->type = IEEE80211_WORK_ASSOC;
2716
2717         if (req->use_mfp) {
2718                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2719                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2720         } else {
2721                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2722                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2723         }
2724
2725         if (req->crypto.control_port)
2726                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2727         else
2728                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2729
2730         sdata->control_port_protocol = req->crypto.control_port_ethertype;
2731         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2732
2733         ieee80211_add_work(wk);
2734         return 0;
2735 }
2736
2737 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2738                          struct cfg80211_deauth_request *req,
2739                          void *cookie)
2740 {
2741         struct ieee80211_local *local = sdata->local;
2742         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2743         struct ieee80211_work *wk;
2744         u8 bssid[ETH_ALEN];
2745         bool assoc_bss = false;
2746
2747         mutex_lock(&ifmgd->mtx);
2748
2749         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2750         if (ifmgd->associated == req->bss) {
2751                 ieee80211_set_disassoc(sdata, false, true);
2752                 mutex_unlock(&ifmgd->mtx);
2753                 assoc_bss = true;
2754         } else {
2755                 bool not_auth_yet = false;
2756
2757                 mutex_unlock(&ifmgd->mtx);
2758
2759                 mutex_lock(&local->mtx);
2760                 list_for_each_entry(wk, &local->work_list, list) {
2761                         if (wk->sdata != sdata)
2762                                 continue;
2763
2764                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2765                             wk->type != IEEE80211_WORK_AUTH &&
2766                             wk->type != IEEE80211_WORK_ASSOC &&
2767                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2768                                 continue;
2769
2770                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2771                                 continue;
2772
2773                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2774                         list_del_rcu(&wk->list);
2775                         free_work(wk);
2776                         break;
2777                 }
2778                 mutex_unlock(&local->mtx);
2779
2780                 /*
2781                  * If somebody requests authentication and we haven't
2782                  * sent out an auth frame yet there's no need to send
2783                  * out a deauth frame either. If the state was PROBE,
2784                  * then this is the case. If it's AUTH we have sent a
2785                  * frame, and if it's IDLE we have completed the auth
2786                  * process already.
2787                  */
2788                 if (not_auth_yet) {
2789                         __cfg80211_auth_canceled(sdata->dev, bssid);
2790                         return 0;
2791                 }
2792         }
2793
2794         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2795                sdata->name, bssid, req->reason_code);
2796
2797         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2798                                        req->reason_code, cookie,
2799                                        !req->local_state_change);
2800         if (assoc_bss)
2801                 sta_info_flush(sdata->local, sdata);
2802
2803         mutex_lock(&sdata->local->mtx);
2804         ieee80211_recalc_idle(sdata->local);
2805         mutex_unlock(&sdata->local->mtx);
2806
2807         return 0;
2808 }
2809
2810 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2811                            struct cfg80211_disassoc_request *req,
2812                            void *cookie)
2813 {
2814         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2815         u8 bssid[ETH_ALEN];
2816
2817         mutex_lock(&ifmgd->mtx);
2818
2819         /*
2820          * cfg80211 should catch this ... but it's racy since
2821          * we can receive a disassoc frame, process it, hand it
2822          * to cfg80211 while that's in a locked section already
2823          * trying to tell us that the user wants to disconnect.
2824          */
2825         if (ifmgd->associated != req->bss) {
2826                 mutex_unlock(&ifmgd->mtx);
2827                 return -ENOLINK;
2828         }
2829
2830         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2831                sdata->name, req->bss->bssid, req->reason_code);
2832
2833         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2834         ieee80211_set_disassoc(sdata, false, true);
2835
2836         mutex_unlock(&ifmgd->mtx);
2837
2838         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2839                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2840                         cookie, !req->local_state_change);
2841         sta_info_flush(sdata->local, sdata);
2842
2843         mutex_lock(&sdata->local->mtx);
2844         ieee80211_recalc_idle(sdata->local);
2845         mutex_unlock(&sdata->local->mtx);
2846
2847         return 0;
2848 }
2849
2850 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2851                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2852                                gfp_t gfp)
2853 {
2854         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2855
2856         trace_api_cqm_rssi_notify(sdata, rssi_event);
2857
2858         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2859 }
2860 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
2861
2862 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
2863 {
2864         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2865         return sdata->dev->operstate;
2866 }
2867 EXPORT_SYMBOL(ieee80211_get_operstate);