SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/pm_qos_params.h>
  21 #include <linux/crc32.h>
  22 #include <net/mac80211.h>
  23 #include <asm/unaligned.h>
  24
  25 #include "ieee80211_i.h"
  26 #include "driver-ops.h"
  27 #include "rate.h"
  28 #include "led.h"
  29
  30 #define IEEE80211_MAX_PROBE_TRIES 5
  31
  32 /*
  33  * beacon loss detection timeout
  34  * XXX: should depend on beacon interval
  35  */
  36 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
  37 /*
  38  * Time the connection can be idle before we probe
  39  * it to see if we can still talk to the AP.
  40  */
  41 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  42 /*
  43  * Time we wait for a probe response after sending
  44  * a probe request because of beacon loss or for
  45  * checking the connection still works.
  46  */
  47 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  48
  49 /*
  50  * Weight given to the latest Beacon frame when calculating average signal
  51  * strength for Beacon frames received in the current BSS. This must be
  52  * between 1 and 15.
  53  */
  54 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  55
  56 #define TMR_RUNNING_TIMER       0
  57 #define TMR_RUNNING_CHANSW      1
  58
  59 /*
  60  * All cfg80211 functions have to be called outside a locked
  61  * section so that they can acquire a lock themselves... This
  62  * is much simpler than queuing up things in cfg80211, but we
  63  * do need some indirection for that here.
  64  */
  65 enum rx_mgmt_action {
  66         /* no action required */
  67         RX_MGMT_NONE,
  68
  69         /* caller must call cfg80211_send_rx_auth() */
  70         RX_MGMT_CFG80211_AUTH,
  71
  72         /* caller must call cfg80211_send_rx_assoc() */
  73         RX_MGMT_CFG80211_ASSOC,
  74
  75         /* caller must call cfg80211_send_deauth() */
  76         RX_MGMT_CFG80211_DEAUTH,
  77
  78         /* caller must call cfg80211_send_disassoc() */
  79         RX_MGMT_CFG80211_DISASSOC,
  80
  81         /* caller must tell cfg80211 about internal error */
  82         RX_MGMT_CFG80211_ASSOC_ERROR,
  83 };
  84
  85 /* utils */
  86 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  87 {
  88         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  89 }
  90
  91 /*
  92  * We can have multiple work items (and connection probing)
  93  * scheduling this timer, but we need to take care to only
  94  * reschedule it when it should fire _earlier_ than it was
  95  * asked for before, or if it's not pending right now. This
  96  * function ensures that. Note that it then is required to
  97  * run this function for all timeouts after the first one
  98  * has happened -- the work that runs from this timer will
  99  * do that.
 100  */
 101 static void run_again(struct ieee80211_if_managed *ifmgd,
 102                              unsigned long timeout)
 103 {
 104         ASSERT_MGD_MTX(ifmgd);
 105
 106         if (!timer_pending(&ifmgd->timer) ||
 107             time_before(timeout, ifmgd->timer.expires))
 108                 mod_timer(&ifmgd->timer, timeout);
 109 }
 110
 111 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 112 {
 113         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 114                 return;
 115
 116         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 117                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 118 }
 119
 120 static int ecw2cw(int ecw)
 121 {
 122         return (1 << ecw) - 1;
 123 }
 124
 125 /*
 126  * ieee80211_enable_ht should be called only after the operating band
 127  * has been determined as ht configuration depends on the hw's
 128  * HT abilities for a specific band.
 129  */
 130 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 131                                struct ieee80211_ht_info *hti,
 132                                const u8 *bssid, u16 ap_ht_cap_flags)
 133 {
 134         struct ieee80211_local *local = sdata->local;
 135         struct ieee80211_supported_band *sband;
 136         struct sta_info *sta;
 137         u32 changed = 0;
 138         u16 ht_opmode;
 139         bool enable_ht = true, ht_changed;
 140         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 141
 142         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 143
 144         /* HT is not supported */
 145         if (!sband->ht_cap.ht_supported)
 146                 enable_ht = false;
 147
 148         /* check that channel matches the right operating channel */
 149         if (local->hw.conf.channel->center_freq !=
 150             ieee80211_channel_to_frequency(hti->control_chan))
 151                 enable_ht = false;
 152
 153         if (enable_ht) {
 154                 channel_type = NL80211_CHAN_HT20;
 155
 156                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 157                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 158                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 159                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 160                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 161                                 if (!(local->hw.conf.channel->flags &
 162                                     IEEE80211_CHAN_NO_HT40PLUS))
 163                                         channel_type = NL80211_CHAN_HT40PLUS;
 164                                 break;
 165                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 166                                 if (!(local->hw.conf.channel->flags &
 167                                     IEEE80211_CHAN_NO_HT40MINUS))
 168                                         channel_type = NL80211_CHAN_HT40MINUS;
 169                                 break;
 170                         }
 171                 }
 172         }
 173
 174         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 175                      channel_type != local->hw.conf.channel_type;
 176
 177         if (local->tmp_channel)
 178                 local->tmp_channel_type = channel_type;
 179         local->oper_channel_type = channel_type;
 180
 181         if (ht_changed) {
 182                 /* channel_type change automatically detected */
 183                 ieee80211_hw_config(local, 0);
 184
 185                 rcu_read_lock();
 186                 sta = sta_info_get(sdata, bssid);
 187                 if (sta)
 188                         rate_control_rate_update(local, sband, sta,
 189                                                  IEEE80211_RC_HT_CHANGED,
 190                                                  local->oper_channel_type);
 191                 rcu_read_unlock();
 192         }
 193
 194         /* disable HT */
 195         if (!enable_ht)
 196                 return 0;
 197
 198         ht_opmode = le16_to_cpu(hti->operation_mode);
 199
 200         /* if bss configuration changed store the new one */
 201         if (!sdata->ht_opmode_valid ||
 202             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 203                 changed |= BSS_CHANGED_HT;
 204                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 205                 sdata->ht_opmode_valid = true;
 206         }
 207
 208         return changed;
 209 }
 210
 211 /* frame sending functions */
 212
 213 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 214                                            const u8 *bssid, u16 stype, u16 reason,
 215                                            void *cookie, bool send_frame)
 216 {
 217         struct ieee80211_local *local = sdata->local;
 218         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 219         struct sk_buff *skb;
 220         struct ieee80211_mgmt *mgmt;
 221
 222         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 223         if (!skb) {
 224                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 225                        "deauth/disassoc frame\n", sdata->name);
 226                 return;
 227         }
 228         skb_reserve(skb, local->hw.extra_tx_headroom);
 229
 230         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 231         memset(mgmt, 0, 24);
 232         memcpy(mgmt->da, bssid, ETH_ALEN);
 233         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 234         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 235         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 236         skb_put(skb, 2);
 237         /* u.deauth.reason_code == u.disassoc.reason_code */
 238         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 239
 240         if (stype == IEEE80211_STYPE_DEAUTH)
 241                 if (cookie)
 242                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 243                 else
 244                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 245         else
 246                 if (cookie)
 247                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 248                 else
 249                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 250         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 251                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 252
 253         if (send_frame)
 254                 ieee80211_tx_skb(sdata, skb);
 255         else
 256                 kfree_skb(skb);
 257 }
 258
 259 void ieee80211_send_pspoll(struct ieee80211_local *local,
 260                            struct ieee80211_sub_if_data *sdata)
 261 {
 262         struct ieee80211_pspoll *pspoll;
 263         struct sk_buff *skb;
 264
 265         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 266         if (!skb)
 267                 return;
 268
 269         pspoll = (struct ieee80211_pspoll *) skb->data;
 270         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 271
 272         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 273         ieee80211_tx_skb(sdata, skb);
 274 }
 275
 276 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 277                              struct ieee80211_sub_if_data *sdata,
 278                              int powersave)
 279 {
 280         struct sk_buff *skb;
 281         struct ieee80211_hdr_3addr *nullfunc;
 282
 283         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 284         if (!skb)
 285                 return;
 286
 287         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 288         if (powersave)
 289                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 290
 291         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 292         ieee80211_tx_skb(sdata, skb);
 293 }
 294
 295 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 296                                           struct ieee80211_sub_if_data *sdata)
 297 {
 298         struct sk_buff *skb;
 299         struct ieee80211_hdr *nullfunc;
 300         __le16 fc;
 301
 302         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 303                 return;
 304
 305         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 306         if (!skb) {
 307                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 308                        "nullfunc frame\n", sdata->name);
 309                 return;
 310         }
 311         skb_reserve(skb, local->hw.extra_tx_headroom);
 312
 313         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 314         memset(nullfunc, 0, 30);
 315         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 316                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 317         nullfunc->frame_control = fc;
 318         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 319         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 320         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 321         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 322
 323         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 324         ieee80211_tx_skb(sdata, skb);
 325 }
 326
 327 /* spectrum management related things */
 328 static void ieee80211_chswitch_work(struct work_struct *work)
 329 {
 330         struct ieee80211_sub_if_data *sdata =
 331                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 332         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 333
 334         if (!ieee80211_sdata_running(sdata))
 335                 return;
 336
 337         mutex_lock(&ifmgd->mtx);
 338         if (!ifmgd->associated)
 339                 goto out;
 340
 341         sdata->local->oper_channel = sdata->local->csa_channel;
 342         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
 343
 344         /* XXX: shouldn't really modify cfg80211-owned data! */
 345         ifmgd->associated->channel = sdata->local->oper_channel;
 346
 347         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 348                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 349  out:
 350         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 351         mutex_unlock(&ifmgd->mtx);
 352 }
 353
 354 static void ieee80211_chswitch_timer(unsigned long data)
 355 {
 356         struct ieee80211_sub_if_data *sdata =
 357                 (struct ieee80211_sub_if_data *) data;
 358         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 359
 360         if (sdata->local->quiescing) {
 361                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 362                 return;
 363         }
 364
 365         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 366 }
 367
 368 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 369                                       struct ieee80211_channel_sw_ie *sw_elem,
 370                                       struct ieee80211_bss *bss)
 371 {
 372         struct cfg80211_bss *cbss =
 373                 container_of((void *)bss, struct cfg80211_bss, priv);
 374         struct ieee80211_channel *new_ch;
 375         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 376         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 377
 378         ASSERT_MGD_MTX(ifmgd);
 379
 380         if (!ifmgd->associated)
 381                 return;
 382
 383         if (sdata->local->scanning)
 384                 return;
 385
 386         /* Disregard subsequent beacons if we are already running a timer
 387            processing a CSA */
 388
 389         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 390                 return;
 391
 392         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 393         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 394                 return;
 395
 396         sdata->local->csa_channel = new_ch;
 397
 398         if (sw_elem->count <= 1) {
 399                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 400         } else {
 401                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 402                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 403                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 404                 mod_timer(&ifmgd->chswitch_timer,
 405                           jiffies +
 406                           msecs_to_jiffies(sw_elem->count *
 407                                            cbss->beacon_interval));
 408         }
 409 }
 410
 411 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 412                                         u16 capab_info, u8 *pwr_constr_elem,
 413                                         u8 pwr_constr_elem_len)
 414 {
 415         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 416
 417         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 418                 return;
 419
 420         /* Power constraint IE length should be 1 octet */
 421         if (pwr_constr_elem_len != 1)
 422                 return;
 423
 424         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 425             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 426                 sdata->local->power_constr_level = *pwr_constr_elem;
 427                 ieee80211_hw_config(sdata->local, 0);
 428         }
 429 }
 430
 431 /* powersave */
 432 static void ieee80211_enable_ps(struct ieee80211_local *local,
 433                                 struct ieee80211_sub_if_data *sdata)
 434 {
 435         struct ieee80211_conf *conf = &local->hw.conf;
 436
 437         /*
 438          * If we are scanning right now then the parameters will
 439          * take effect when scan finishes.
 440          */
 441         if (local->scanning)
 442                 return;
 443
 444         if (conf->dynamic_ps_timeout > 0 &&
 445             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 446                 mod_timer(&local->dynamic_ps_timer, jiffies +
 447                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 448         } else {
 449                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 450                         ieee80211_send_nullfunc(local, sdata, 1);
 451
 452                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 453                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 454                         return;
 455
 456                 conf->flags |= IEEE80211_CONF_PS;
 457                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 458         }
 459 }
 460
 461 static void ieee80211_change_ps(struct ieee80211_local *local)
 462 {
 463         struct ieee80211_conf *conf = &local->hw.conf;
 464
 465         if (local->ps_sdata) {
 466                 ieee80211_enable_ps(local, local->ps_sdata);
 467         } else if (conf->flags & IEEE80211_CONF_PS) {
 468                 conf->flags &= ~IEEE80211_CONF_PS;
 469                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 470                 del_timer_sync(&local->dynamic_ps_timer);
 471                 cancel_work_sync(&local->dynamic_ps_enable_work);
 472         }
 473 }
 474
 475 /* need to hold RTNL or interface lock */
 476 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 477 {
 478         struct ieee80211_sub_if_data *sdata, *found = NULL;
 479         int count = 0;
 480         int timeout;
 481
 482         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 483                 local->ps_sdata = NULL;
 484                 return;
 485         }
 486
 487         if (!list_empty(&local->work_list)) {
 488                 local->ps_sdata = NULL;
 489                 goto change;
 490         }
 491
 492         list_for_each_entry(sdata, &local->interfaces, list) {
 493                 if (!ieee80211_sdata_running(sdata))
 494                         continue;
 495                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 496                         continue;
 497                 found = sdata;
 498                 count++;
 499         }
 500
 501         if (count == 1 && found->u.mgd.powersave &&
 502             found->u.mgd.associated &&
 503             found->u.mgd.associated->beacon_ies &&
 504             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 505                                     IEEE80211_STA_CONNECTION_POLL))) {
 506                 s32 beaconint_us;
 507
 508                 if (latency < 0)
 509                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 510
 511                 beaconint_us = ieee80211_tu_to_usec(
 512                                         found->vif.bss_conf.beacon_int);
 513
 514                 timeout = local->hw.conf.dynamic_ps_forced_timeout;
 515                 if (timeout < 0) {
 516                         /*
 517                          * The 2 second value is there for compatibility until
 518                          * the PM_QOS_NETWORK_LATENCY is configured with real
 519                          * values.
 520                          */
 521                         if (latency == 2000000000)
 522                                 timeout = 100;
 523                         else if (latency <= 50000)
 524                                 timeout = 300;
 525                         else if (latency <= 100000)
 526                                 timeout = 100;
 527                         else if (latency <= 500000)
 528                                 timeout = 50;
 529                         else
 530                                 timeout = 0;
 531                 }
 532                 local->hw.conf.dynamic_ps_timeout = timeout;
 533
 534                 if (beaconint_us > latency) {
 535                         local->ps_sdata = NULL;
 536                 } else {
 537                         struct ieee80211_bss *bss;
 538                         int maxslp = 1;
 539                         u8 dtimper;
 540
 541                         bss = (void *)found->u.mgd.associated->priv;
 542                         dtimper = bss->dtim_period;
 543
 544                         /* If the TIM IE is invalid, pretend the value is 1 */
 545                         if (!dtimper)
 546                                 dtimper = 1;
 547                         else if (dtimper > 1)
 548                                 maxslp = min_t(int, dtimper,
 549                                                     latency / beaconint_us);
 550
 551                         local->hw.conf.max_sleep_period = maxslp;
 552                         local->hw.conf.ps_dtim_period = dtimper;
 553                         local->ps_sdata = found;
 554                 }
 555         } else {
 556                 local->ps_sdata = NULL;
 557         }
 558
 559  change:
 560         ieee80211_change_ps(local);
 561 }
 562
 563 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 564 {
 565         struct ieee80211_local *local =
 566                 container_of(work, struct ieee80211_local,
 567                              dynamic_ps_disable_work);
 568
 569         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 570                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 571                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 572         }
 573
 574         ieee80211_wake_queues_by_reason(&local->hw,
 575                                         IEEE80211_QUEUE_STOP_REASON_PS);
 576 }
 577
 578 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 579 {
 580         struct ieee80211_local *local =
 581                 container_of(work, struct ieee80211_local,
 582                              dynamic_ps_enable_work);
 583         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 584         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 585
 586         /* can only happen when PS was just disabled anyway */
 587         if (!sdata)
 588                 return;
 589
 590         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 591                 return;
 592
 593         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 594             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 595                 ieee80211_send_nullfunc(local, sdata, 1);
 596
 597         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 598               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 599             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 600                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 601                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 602                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 603         }
 604 }
 605
 606 void ieee80211_dynamic_ps_timer(unsigned long data)
 607 {
 608         struct ieee80211_local *local = (void *) data;
 609
 610         if (local->quiescing || local->suspended)
 611                 return;
 612
 613         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 614 }
 615
 616 /* MLME */
 617 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 618                                      struct ieee80211_if_managed *ifmgd,
 619                                      u8 *wmm_param, size_t wmm_param_len)
 620 {
 621         struct ieee80211_tx_queue_params params;
 622         size_t left;
 623         int count;
 624         u8 *pos, uapsd_queues = 0;
 625
 626         if (!local->ops->conf_tx)
 627                 return;
 628
 629         if (local->hw.queues < 4)
 630                 return;
 631
 632         if (!wmm_param)
 633                 return;
 634
 635         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 636                 return;
 637
 638         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 639                 uapsd_queues = local->uapsd_queues;
 640
 641         count = wmm_param[6] & 0x0f;
 642         if (count == ifmgd->wmm_last_param_set)
 643                 return;
 644         ifmgd->wmm_last_param_set = count;
 645
 646         pos = wmm_param + 8;
 647         left = wmm_param_len - 8;
 648
 649         memset(&params, 0, sizeof(params));
 650
 651         local->wmm_acm = 0;
 652         for (; left >= 4; left -= 4, pos += 4) {
 653                 int aci = (pos[0] >> 5) & 0x03;
 654                 int acm = (pos[0] >> 4) & 0x01;
 655                 bool uapsd = false;
 656                 int queue;
 657
 658                 switch (aci) {
 659                 case 1: /* AC_BK */
 660                         queue = 3;
 661                         if (acm)
 662                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 663                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 664                                 uapsd = true;
 665                         break;
 666                 case 2: /* AC_VI */
 667                         queue = 1;
 668                         if (acm)
 669                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 670                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 671                                 uapsd = true;
 672                         break;
 673                 case 3: /* AC_VO */
 674                         queue = 0;
 675                         if (acm)
 676                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 677                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 678                                 uapsd = true;
 679                         break;
 680                 case 0: /* AC_BE */
 681                 default:
 682                         queue = 2;
 683                         if (acm)
 684                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 685                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 686                                 uapsd = true;
 687                         break;
 688                 }
 689
 690                 params.aifs = pos[0] & 0x0f;
 691                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 692                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 693                 params.txop = get_unaligned_le16(pos + 2);
 694                 params.uapsd = uapsd;
 695
 696 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 697                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 698                        "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 699                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 700                        params.aifs, params.cw_min, params.cw_max, params.txop,
 701                        params.uapsd);
 702 #endif
 703                 if (drv_conf_tx(local, queue, &params))
 704                         printk(KERN_DEBUG "%s: failed to set TX queue "
 705                                "parameters for queue %d\n",
 706                                wiphy_name(local->hw.wiphy), queue);
 707         }
 708
 709         /* enable WMM or activate new settings */
 710         local->hw.conf.flags |= IEEE80211_CONF_QOS;
 711         drv_config(local, IEEE80211_CONF_CHANGE_QOS);
 712 }
 713
 714 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 715                                            u16 capab, bool erp_valid, u8 erp)
 716 {
 717         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 718         u32 changed = 0;
 719         bool use_protection;
 720         bool use_short_preamble;
 721         bool use_short_slot;
 722
 723         if (erp_valid) {
 724                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 725                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 726         } else {
 727                 use_protection = false;
 728                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 729         }
 730
 731         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 732         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 733                 use_short_slot = true;
 734
 735         if (use_protection != bss_conf->use_cts_prot) {
 736                 bss_conf->use_cts_prot = use_protection;
 737                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 738         }
 739
 740         if (use_short_preamble != bss_conf->use_short_preamble) {
 741                 bss_conf->use_short_preamble = use_short_preamble;
 742                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 743         }
 744
 745         if (use_short_slot != bss_conf->use_short_slot) {
 746                 bss_conf->use_short_slot = use_short_slot;
 747                 changed |= BSS_CHANGED_ERP_SLOT;
 748         }
 749
 750         return changed;
 751 }
 752
 753 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 754                                      struct cfg80211_bss *cbss,
 755                                      u32 bss_info_changed)
 756 {
 757         struct ieee80211_bss *bss = (void *)cbss->priv;
 758         struct ieee80211_local *local = sdata->local;
 759
 760         bss_info_changed |= BSS_CHANGED_ASSOC;
 761         /* set timing information */
 762         sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
 763         sdata->vif.bss_conf.timestamp = cbss->tsf;
 764
 765         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 766         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 767                 cbss->capability, bss->has_erp_value, bss->erp_value);
 768
 769         sdata->u.mgd.associated = cbss;
 770         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 771
 772         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 773
 774         /* just to be sure */
 775         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 776                                 IEEE80211_STA_BEACON_POLL);
 777
 778         /*
 779          * Always handle WMM once after association regardless
 780          * of the first value the AP uses. Setting -1 here has
 781          * that effect because the AP values is an unsigned
 782          * 4-bit value.
 783          */
 784         sdata->u.mgd.wmm_last_param_set = -1;
 785
 786         ieee80211_led_assoc(local, 1);
 787
 788         sdata->vif.bss_conf.assoc = 1;
 789         /*
 790          * For now just always ask the driver to update the basic rateset
 791          * when we have associated, we aren't checking whether it actually
 792          * changed or not.
 793          */
 794         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 795
 796         /* And the BSSID changed - we're associated now */
 797         bss_info_changed |= BSS_CHANGED_BSSID;
 798
 799         /* Tell the driver to monitor connection quality (if supported) */
 800         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 801             sdata->vif.bss_conf.cqm_rssi_thold)
 802                 bss_info_changed |= BSS_CHANGED_CQM;
 803
 804         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 805
 806         mutex_lock(&local->iflist_mtx);
 807         ieee80211_recalc_ps(local, -1);
 808         ieee80211_recalc_smps(local, sdata);
 809         mutex_unlock(&local->iflist_mtx);
 810
 811         netif_tx_start_all_queues(sdata->dev);
 812         netif_carrier_on(sdata->dev);
 813 }
 814
 815 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 816                                    bool remove_sta)
 817 {
 818         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 819         struct ieee80211_local *local = sdata->local;
 820         struct sta_info *sta;
 821         u32 changed = 0, config_changed = 0;
 822         u8 bssid[ETH_ALEN];
 823
 824         ASSERT_MGD_MTX(ifmgd);
 825
 826         if (WARN_ON(!ifmgd->associated))
 827                 return;
 828
 829         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 830
 831         ifmgd->associated = NULL;
 832         memset(ifmgd->bssid, 0, ETH_ALEN);
 833
 834         /*
 835          * we need to commit the associated = NULL change because the
 836          * scan code uses that to determine whether this iface should
 837          * go to/wake up from powersave or not -- and could otherwise
 838          * wake the queues erroneously.
 839          */
 840         smp_mb();
 841
 842         /*
 843          * Thus, we can only afterwards stop the queues -- to account
 844          * for the case where another CPU is finishing a scan at this
 845          * time -- we don't want the scan code to enable queues.
 846          */
 847
 848         netif_tx_stop_all_queues(sdata->dev);
 849         netif_carrier_off(sdata->dev);
 850
 851         rcu_read_lock();
 852         sta = sta_info_get(sdata, bssid);
 853         if (sta) {
 854                 set_sta_flags(sta, WLAN_STA_DISASSOC);
 855                 ieee80211_sta_tear_down_BA_sessions(sta);
 856         }
 857         rcu_read_unlock();
 858
 859         changed |= ieee80211_reset_erp_info(sdata);
 860
 861         ieee80211_led_assoc(local, 0);
 862         changed |= BSS_CHANGED_ASSOC;
 863         sdata->vif.bss_conf.assoc = false;
 864
 865         ieee80211_set_wmm_default(sdata);
 866
 867         /* channel(_type) changes are handled by ieee80211_hw_config */
 868         local->oper_channel_type = NL80211_CHAN_NO_HT;
 869
 870         /* on the next assoc, re-program HT parameters */
 871         sdata->ht_opmode_valid = false;
 872
 873         local->power_constr_level = 0;
 874
 875         del_timer_sync(&local->dynamic_ps_timer);
 876         cancel_work_sync(&local->dynamic_ps_enable_work);
 877
 878         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 879                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 880                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 881         }
 882
 883         ieee80211_hw_config(local, config_changed);
 884
 885         /* And the BSSID changed -- not very interesting here */
 886         changed |= BSS_CHANGED_BSSID;
 887         ieee80211_bss_info_change_notify(sdata, changed);
 888
 889         if (remove_sta)
 890                 sta_info_destroy_addr(sdata, bssid);
 891 }
 892
 893 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 894                              struct ieee80211_hdr *hdr)
 895 {
 896         /*
 897          * We can postpone the mgd.timer whenever receiving unicast frames
 898          * from AP because we know that the connection is working both ways
 899          * at that time. But multicast frames (and hence also beacons) must
 900          * be ignored here, because we need to trigger the timer during
 901          * data idle periods for sending the periodic probe request to the
 902          * AP we're connected to.
 903          */
 904         if (is_multicast_ether_addr(hdr->addr1))
 905                 return;
 906
 907         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 908                 return;
 909
 910         mod_timer(&sdata->u.mgd.conn_mon_timer,
 911                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 912 }
 913
 914 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
 915 {
 916         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 917         const u8 *ssid;
 918
 919         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
 920         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
 921                                  ssid + 2, ssid[1], NULL, 0);
 922
 923         ifmgd->probe_send_count++;
 924         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
 925         run_again(ifmgd, ifmgd->probe_timeout);
 926 }
 927
 928 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
 929                                    bool beacon)
 930 {
 931         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 932         bool already = false;
 933
 934         if (!ieee80211_sdata_running(sdata))
 935                 return;
 936
 937         if (sdata->local->scanning)
 938                 return;
 939
 940         if (sdata->local->tmp_channel)
 941                 return;
 942
 943         mutex_lock(&ifmgd->mtx);
 944
 945         if (!ifmgd->associated)
 946                 goto out;
 947
 948 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 949         if (beacon && net_ratelimit())
 950                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
 951                        "- sending probe request\n", sdata->name);
 952 #endif
 953
 954         /*
 955          * The driver/our work has already reported this event or the
 956          * connection monitoring has kicked in and we have already sent
 957          * a probe request. Or maybe the AP died and the driver keeps
 958          * reporting until we disassociate...
 959          *
 960          * In either case we have to ignore the current call to this
 961          * function (except for setting the correct probe reason bit)
 962          * because otherwise we would reset the timer every time and
 963          * never check whether we received a probe response!
 964          */
 965         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 966                             IEEE80211_STA_CONNECTION_POLL))
 967                 already = true;
 968
 969         if (beacon)
 970                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
 971         else
 972                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
 973
 974         if (already)
 975                 goto out;
 976
 977         mutex_lock(&sdata->local->iflist_mtx);
 978         ieee80211_recalc_ps(sdata->local, -1);
 979         mutex_unlock(&sdata->local->iflist_mtx);
 980
 981         ifmgd->probe_send_count = 0;
 982         ieee80211_mgd_probe_ap_send(sdata);
 983  out:
 984         mutex_unlock(&ifmgd->mtx);
 985 }
 986
 987 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
 988 {
 989         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 990         struct ieee80211_local *local = sdata->local;
 991         u8 bssid[ETH_ALEN];
 992
 993         mutex_lock(&ifmgd->mtx);
 994         if (!ifmgd->associated) {
 995                 mutex_unlock(&ifmgd->mtx);
 996                 return;
 997         }
 998
 999         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1000
1001         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1002
1003         ieee80211_set_disassoc(sdata, true);
1004         ieee80211_recalc_idle(local);
1005         mutex_unlock(&ifmgd->mtx);
1006         /*
1007          * must be outside lock due to cfg80211,
1008          * but that's not a problem.
1009          */
1010         ieee80211_send_deauth_disassoc(sdata, bssid,
1011                                        IEEE80211_STYPE_DEAUTH,
1012                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1013                                        NULL, true);
1014 }
1015
1016 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1017 {
1018         struct ieee80211_sub_if_data *sdata =
1019                 container_of(work, struct ieee80211_sub_if_data,
1020                              u.mgd.beacon_connection_loss_work);
1021
1022         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1023                 __ieee80211_connection_loss(sdata);
1024         else
1025                 ieee80211_mgd_probe_ap(sdata, true);
1026 }
1027
1028 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1029 {
1030         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1031         struct ieee80211_hw *hw = &sdata->local->hw;
1032
1033         trace_api_beacon_loss(sdata);
1034
1035         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1036         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1037 }
1038 EXPORT_SYMBOL(ieee80211_beacon_loss);
1039
1040 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1041 {
1042         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1043         struct ieee80211_hw *hw = &sdata->local->hw;
1044
1045         trace_api_connection_loss(sdata);
1046
1047         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1048         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1049 }
1050 EXPORT_SYMBOL(ieee80211_connection_loss);
1051
1052
1053 static enum rx_mgmt_action __must_check
1054 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1055                          struct ieee80211_mgmt *mgmt, size_t len)
1056 {
1057         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1058         const u8 *bssid = NULL;
1059         u16 reason_code;
1060
1061         if (len < 24 + 2)
1062                 return RX_MGMT_NONE;
1063
1064         ASSERT_MGD_MTX(ifmgd);
1065
1066         bssid = ifmgd->associated->bssid;
1067
1068         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1069
1070         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1071                         sdata->name, bssid, reason_code);
1072
1073         ieee80211_set_disassoc(sdata, true);
1074         ieee80211_recalc_idle(sdata->local);
1075
1076         return RX_MGMT_CFG80211_DEAUTH;
1077 }
1078
1079
1080 static enum rx_mgmt_action __must_check
1081 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1082                            struct ieee80211_mgmt *mgmt, size_t len)
1083 {
1084         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1085         u16 reason_code;
1086
1087         if (len < 24 + 2)
1088                 return RX_MGMT_NONE;
1089
1090         ASSERT_MGD_MTX(ifmgd);
1091
1092         if (WARN_ON(!ifmgd->associated))
1093                 return RX_MGMT_NONE;
1094
1095         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1096                 return RX_MGMT_NONE;
1097
1098         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1099
1100         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1101                         sdata->name, mgmt->sa, reason_code);
1102
1103         ieee80211_set_disassoc(sdata, true);
1104         ieee80211_recalc_idle(sdata->local);
1105         return RX_MGMT_CFG80211_DISASSOC;
1106 }
1107
1108
1109 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1110                                     struct ieee80211_mgmt *mgmt, size_t len)
1111 {
1112         struct ieee80211_sub_if_data *sdata = wk->sdata;
1113         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1114         struct ieee80211_local *local = sdata->local;
1115         struct ieee80211_supported_band *sband;
1116         struct sta_info *sta;
1117         struct cfg80211_bss *cbss = wk->assoc.bss;
1118         u8 *pos;
1119         u32 rates, basic_rates;
1120         u16 capab_info, aid;
1121         struct ieee802_11_elems elems;
1122         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1123         u32 changed = 0;
1124         int i, j, err;
1125         bool have_higher_than_11mbit = false;
1126         u16 ap_ht_cap_flags;
1127
1128         /* AssocResp and ReassocResp have identical structure */
1129
1130         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1131         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1132
1133         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1134                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1135                        "set\n", sdata->name, aid);
1136         aid &= ~(BIT(15) | BIT(14));
1137
1138         pos = mgmt->u.assoc_resp.variable;
1139         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1140
1141         if (!elems.supp_rates) {
1142                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1143                        sdata->name);
1144                 return false;
1145         }
1146
1147         ifmgd->aid = aid;
1148
1149         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1150         if (!sta) {
1151                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1152                        " the AP\n", sdata->name);
1153                 return false;
1154         }
1155
1156         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1157                            WLAN_STA_ASSOC_AP);
1158         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1159                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1160
1161         rates = 0;
1162         basic_rates = 0;
1163         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1164
1165         for (i = 0; i < elems.supp_rates_len; i++) {
1166                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1167                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1168
1169                 if (rate > 110)
1170                         have_higher_than_11mbit = true;
1171
1172                 for (j = 0; j < sband->n_bitrates; j++) {
1173                         if (sband->bitrates[j].bitrate == rate) {
1174                                 rates |= BIT(j);
1175                                 if (is_basic)
1176                                         basic_rates |= BIT(j);
1177                                 break;
1178                         }
1179                 }
1180         }
1181
1182         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1183                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1184                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1185
1186                 if (rate > 110)
1187                         have_higher_than_11mbit = true;
1188
1189                 for (j = 0; j < sband->n_bitrates; j++) {
1190                         if (sband->bitrates[j].bitrate == rate) {
1191                                 rates |= BIT(j);
1192                                 if (is_basic)
1193                                         basic_rates |= BIT(j);
1194                                 break;
1195                         }
1196                 }
1197         }
1198
1199         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1200         sdata->vif.bss_conf.basic_rates = basic_rates;
1201
1202         /* cf. IEEE 802.11 9.2.12 */
1203         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1204             have_higher_than_11mbit)
1205                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1206         else
1207                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1208
1209         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1210                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1211                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1212
1213         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1214
1215         rate_control_rate_init(sta);
1216
1217         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1218                 set_sta_flags(sta, WLAN_STA_MFP);
1219
1220         if (elems.wmm_param)
1221                 set_sta_flags(sta, WLAN_STA_WME);
1222
1223         err = sta_info_insert(sta);
1224         sta = NULL;
1225         if (err) {
1226                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1227                        " the AP (error %d)\n", sdata->name, err);
1228                 return false;
1229         }
1230
1231         if (elems.wmm_param)
1232                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1233                                          elems.wmm_param_len);
1234         else
1235                 ieee80211_set_wmm_default(sdata);
1236
1237         local->oper_channel = wk->chan;
1238
1239         if (elems.ht_info_elem && elems.wmm_param &&
1240             (sdata->local->hw.queues >= 4) &&
1241             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1242                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1243                                                cbss->bssid, ap_ht_cap_flags);
1244
1245         /* set AID and assoc capability,
1246          * ieee80211_set_associated() will tell the driver */
1247         bss_conf->aid = aid;
1248         bss_conf->assoc_capability = capab_info;
1249         ieee80211_set_associated(sdata, cbss, changed);
1250
1251         /*
1252          * If we're using 4-addr mode, let the AP know that we're
1253          * doing so, so that it can create the STA VLAN on its side
1254          */
1255         if (ifmgd->use_4addr)
1256                 ieee80211_send_4addr_nullfunc(local, sdata);
1257
1258         /*
1259          * Start timer to probe the connection to the AP now.
1260          * Also start the timer that will detect beacon loss.
1261          */
1262         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1263         mod_beacon_timer(sdata);
1264
1265         return true;
1266 }
1267
1268
1269 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1270                                   struct ieee80211_mgmt *mgmt,
1271                                   size_t len,
1272                                   struct ieee80211_rx_status *rx_status,
1273                                   struct ieee802_11_elems *elems,
1274                                   bool beacon)
1275 {
1276         struct ieee80211_local *local = sdata->local;
1277         int freq;
1278         struct ieee80211_bss *bss;
1279         struct ieee80211_channel *channel;
1280         bool need_ps = false;
1281
1282         if (sdata->u.mgd.associated) {
1283                 bss = (void *)sdata->u.mgd.associated->priv;
1284                 /* not previously set so we may need to recalc */
1285                 need_ps = !bss->dtim_period;
1286         }
1287
1288         if (elems->ds_params && elems->ds_params_len == 1)
1289                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1290         else
1291                 freq = rx_status->freq;
1292
1293         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1294
1295         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1296                 return;
1297
1298         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1299                                         channel, beacon);
1300         if (bss)
1301                 ieee80211_rx_bss_put(local, bss);
1302
1303         if (!sdata->u.mgd.associated)
1304                 return;
1305
1306         if (need_ps) {
1307                 mutex_lock(&local->iflist_mtx);
1308                 ieee80211_recalc_ps(local, -1);
1309                 mutex_unlock(&local->iflist_mtx);
1310         }
1311
1312         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1313             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1314                                                         ETH_ALEN) == 0)) {
1315                 struct ieee80211_channel_sw_ie *sw_elem =
1316                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1317                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1318         }
1319 }
1320
1321
1322 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1323                                          struct sk_buff *skb)
1324 {
1325         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1326         struct ieee80211_if_managed *ifmgd;
1327         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1328         size_t baselen, len = skb->len;
1329         struct ieee802_11_elems elems;
1330
1331         ifmgd = &sdata->u.mgd;
1332
1333         ASSERT_MGD_MTX(ifmgd);
1334
1335         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1336                 return; /* ignore ProbeResp to foreign address */
1337
1338         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1339         if (baselen > len)
1340                 return;
1341
1342         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1343                                 &elems);
1344
1345         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1346
1347         if (ifmgd->associated &&
1348             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1349             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1350                             IEEE80211_STA_CONNECTION_POLL)) {
1351                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1352                                   IEEE80211_STA_BEACON_POLL);
1353                 mutex_lock(&sdata->local->iflist_mtx);
1354                 ieee80211_recalc_ps(sdata->local, -1);
1355                 mutex_unlock(&sdata->local->iflist_mtx);
1356
1357                 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1358                         return;
1359
1360                 /*
1361                  * We've received a probe response, but are not sure whether
1362                  * we have or will be receiving any beacons or data, so let's
1363                  * schedule the timers again, just in case.
1364                  */
1365                 mod_beacon_timer(sdata);
1366
1367                 mod_timer(&ifmgd->conn_mon_timer,
1368                           round_jiffies_up(jiffies +
1369                                            IEEE80211_CONNECTION_IDLE_TIME));
1370         }
1371 }
1372
1373 /*
1374  * This is the canonical list of information elements we care about,
1375  * the filter code also gives us all changes to the Microsoft OUI
1376  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1377  *
1378  * We implement beacon filtering in software since that means we can
1379  * avoid processing the frame here and in cfg80211, and userspace
1380  * will not be able to tell whether the hardware supports it or not.
1381  *
1382  * XXX: This list needs to be dynamic -- userspace needs to be able to
1383  *      add items it requires. It also needs to be able to tell us to
1384  *      look out for other vendor IEs.
1385  */
1386 static const u64 care_about_ies =
1387         (1ULL << WLAN_EID_COUNTRY) |
1388         (1ULL << WLAN_EID_ERP_INFO) |
1389         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1390         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1391         (1ULL << WLAN_EID_HT_CAPABILITY) |
1392         (1ULL << WLAN_EID_HT_INFORMATION);
1393
1394 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1395                                      struct ieee80211_mgmt *mgmt,
1396                                      size_t len,
1397                                      struct ieee80211_rx_status *rx_status)
1398 {
1399         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1400         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1401         size_t baselen;
1402         struct ieee802_11_elems elems;
1403         struct ieee80211_local *local = sdata->local;
1404         u32 changed = 0;
1405         bool erp_valid, directed_tim = false;
1406         u8 erp_value = 0;
1407         u32 ncrc;
1408         u8 *bssid;
1409
1410         ASSERT_MGD_MTX(ifmgd);
1411
1412         /* Process beacon from the current BSS */
1413         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1414         if (baselen > len)
1415                 return;
1416
1417         if (rx_status->freq != local->hw.conf.channel->center_freq)
1418                 return;
1419
1420         /*
1421          * We might have received a number of frames, among them a
1422          * disassoc frame and a beacon...
1423          */
1424         if (!ifmgd->associated)
1425                 return;
1426
1427         bssid = ifmgd->associated->bssid;
1428
1429         /*
1430          * And in theory even frames from a different AP we were just
1431          * associated to a split-second ago!
1432          */
1433         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1434                 return;
1435
1436         /* Track average RSSI from the Beacon frames of the current AP */
1437         ifmgd->last_beacon_signal = rx_status->signal;
1438         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1439                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1440                 ifmgd->ave_beacon_signal = rx_status->signal;
1441                 ifmgd->last_cqm_event_signal = 0;
1442         } else {
1443                 ifmgd->ave_beacon_signal =
1444                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1445                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1446                          ifmgd->ave_beacon_signal) / 16;
1447         }
1448         if (bss_conf->cqm_rssi_thold &&
1449             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1450                 int sig = ifmgd->ave_beacon_signal / 16;
1451                 int last_event = ifmgd->last_cqm_event_signal;
1452                 int thold = bss_conf->cqm_rssi_thold;
1453                 int hyst = bss_conf->cqm_rssi_hyst;
1454                 if (sig < thold &&
1455                     (last_event == 0 || sig < last_event - hyst)) {
1456                         ifmgd->last_cqm_event_signal = sig;
1457                         ieee80211_cqm_rssi_notify(
1458                                 &sdata->vif,
1459                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1460                                 GFP_KERNEL);
1461                 } else if (sig > thold &&
1462                            (last_event == 0 || sig > last_event + hyst)) {
1463                         ifmgd->last_cqm_event_signal = sig;
1464                         ieee80211_cqm_rssi_notify(
1465                                 &sdata->vif,
1466                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1467                                 GFP_KERNEL);
1468                 }
1469         }
1470
1471         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1472 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1473                 if (net_ratelimit()) {
1474                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1475                                "to a received beacon\n", sdata->name);
1476                 }
1477 #endif
1478                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1479                 mutex_lock(&local->iflist_mtx);
1480                 ieee80211_recalc_ps(local, -1);
1481                 mutex_unlock(&local->iflist_mtx);
1482         }
1483
1484         /*
1485          * Push the beacon loss detection into the future since
1486          * we are processing a beacon from the AP just now.
1487          */
1488         mod_beacon_timer(sdata);
1489
1490         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1491         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1492                                           len - baselen, &elems,
1493                                           care_about_ies, ncrc);
1494
1495         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1496                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1497                                                    ifmgd->aid);
1498
1499         if (ncrc != ifmgd->beacon_crc) {
1500                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1501                                       true);
1502
1503                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1504                                          elems.wmm_param_len);
1505         }
1506
1507         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1508                 if (directed_tim) {
1509                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1510                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1511                                 ieee80211_hw_config(local,
1512                                                     IEEE80211_CONF_CHANGE_PS);
1513                                 ieee80211_send_nullfunc(local, sdata, 0);
1514                         } else {
1515                                 local->pspolling = true;
1516
1517                                 /*
1518                                  * Here is assumed that the driver will be
1519                                  * able to send ps-poll frame and receive a
1520                                  * response even though power save mode is
1521                                  * enabled, but some drivers might require
1522                                  * to disable power save here. This needs
1523                                  * to be investigated.
1524                                  */
1525                                 ieee80211_send_pspoll(local, sdata);
1526                         }
1527                 }
1528         }
1529
1530         if (ncrc == ifmgd->beacon_crc)
1531                 return;
1532         ifmgd->beacon_crc = ncrc;
1533
1534         if (elems.erp_info && elems.erp_info_len >= 1) {
1535                 erp_valid = true;
1536                 erp_value = elems.erp_info[0];
1537         } else {
1538                 erp_valid = false;
1539         }
1540         changed |= ieee80211_handle_bss_capability(sdata,
1541                         le16_to_cpu(mgmt->u.beacon.capab_info),
1542                         erp_valid, erp_value);
1543
1544
1545         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1546             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1547                 struct sta_info *sta;
1548                 struct ieee80211_supported_band *sband;
1549                 u16 ap_ht_cap_flags;
1550
1551                 rcu_read_lock();
1552
1553                 sta = sta_info_get(sdata, bssid);
1554                 if (WARN_ON(!sta)) {
1555                         rcu_read_unlock();
1556                         return;
1557                 }
1558
1559                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1560
1561                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1562                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1563
1564                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1565
1566                 rcu_read_unlock();
1567
1568                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1569                                                bssid, ap_ht_cap_flags);
1570         }
1571
1572         /* Note: country IE parsing is done for us by cfg80211 */
1573         if (elems.country_elem) {
1574                 /* TODO: IBSS also needs this */
1575                 if (elems.pwr_constr_elem)
1576                         ieee80211_handle_pwr_constr(sdata,
1577                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1578                                 elems.pwr_constr_elem,
1579                                 elems.pwr_constr_elem_len);
1580         }
1581
1582         ieee80211_bss_info_change_notify(sdata, changed);
1583 }
1584
1585 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1586                                           struct sk_buff *skb)
1587 {
1588         struct ieee80211_local *local = sdata->local;
1589         struct ieee80211_mgmt *mgmt;
1590         u16 fc;
1591
1592         if (skb->len < 24)
1593                 return RX_DROP_MONITOR;
1594
1595         mgmt = (struct ieee80211_mgmt *) skb->data;
1596         fc = le16_to_cpu(mgmt->frame_control);
1597
1598         switch (fc & IEEE80211_FCTL_STYPE) {
1599         case IEEE80211_STYPE_PROBE_RESP:
1600         case IEEE80211_STYPE_BEACON:
1601         case IEEE80211_STYPE_DEAUTH:
1602         case IEEE80211_STYPE_DISASSOC:
1603         case IEEE80211_STYPE_ACTION:
1604                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1605                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1606                 return RX_QUEUED;
1607         }
1608
1609         return RX_DROP_MONITOR;
1610 }
1611
1612 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1613                                          struct sk_buff *skb)
1614 {
1615         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1616         struct ieee80211_rx_status *rx_status;
1617         struct ieee80211_mgmt *mgmt;
1618         enum rx_mgmt_action rma = RX_MGMT_NONE;
1619         u16 fc;
1620
1621         rx_status = (struct ieee80211_rx_status *) skb->cb;
1622         mgmt = (struct ieee80211_mgmt *) skb->data;
1623         fc = le16_to_cpu(mgmt->frame_control);
1624
1625         mutex_lock(&ifmgd->mtx);
1626
1627         if (ifmgd->associated &&
1628             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1629                 switch (fc & IEEE80211_FCTL_STYPE) {
1630                 case IEEE80211_STYPE_BEACON:
1631                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1632                                                  rx_status);
1633                         break;
1634                 case IEEE80211_STYPE_PROBE_RESP:
1635                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1636                         break;
1637                 case IEEE80211_STYPE_DEAUTH:
1638                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1639                         break;
1640                 case IEEE80211_STYPE_DISASSOC:
1641                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1642                         break;
1643                 case IEEE80211_STYPE_ACTION:
1644                         if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1645                                 break;
1646
1647                         ieee80211_sta_process_chanswitch(sdata,
1648                                         &mgmt->u.action.u.chan_switch.sw_elem,
1649                                         (void *)ifmgd->associated->priv);
1650                         break;
1651                 }
1652                 mutex_unlock(&ifmgd->mtx);
1653
1654                 switch (rma) {
1655                 case RX_MGMT_NONE:
1656                         /* no action */
1657                         break;
1658                 case RX_MGMT_CFG80211_DEAUTH:
1659                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1660                         break;
1661                 case RX_MGMT_CFG80211_DISASSOC:
1662                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1663                         break;
1664                 default:
1665                         WARN(1, "unexpected: %d", rma);
1666                 }
1667                 goto out;
1668         }
1669
1670         mutex_unlock(&ifmgd->mtx);
1671
1672         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1673             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1674                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1675
1676  out:
1677         kfree_skb(skb);
1678 }
1679
1680 static void ieee80211_sta_timer(unsigned long data)
1681 {
1682         struct ieee80211_sub_if_data *sdata =
1683                 (struct ieee80211_sub_if_data *) data;
1684         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1685         struct ieee80211_local *local = sdata->local;
1686
1687         if (local->quiescing) {
1688                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1689                 return;
1690         }
1691
1692         ieee80211_queue_work(&local->hw, &ifmgd->work);
1693 }
1694
1695 static void ieee80211_sta_work(struct work_struct *work)
1696 {
1697         struct ieee80211_sub_if_data *sdata =
1698                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1699         struct ieee80211_local *local = sdata->local;
1700         struct ieee80211_if_managed *ifmgd;
1701         struct sk_buff *skb;
1702
1703         if (!ieee80211_sdata_running(sdata))
1704                 return;
1705
1706         if (local->scanning)
1707                 return;
1708
1709         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1710                 return;
1711
1712         /*
1713          * ieee80211_queue_work() should have picked up most cases,
1714          * here we'll pick the the rest.
1715          */
1716         if (WARN(local->suspended, "STA MLME work scheduled while "
1717                  "going to suspend\n"))
1718                 return;
1719
1720         ifmgd = &sdata->u.mgd;
1721
1722         /* first process frames to avoid timing out while a frame is pending */
1723         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1724                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1725
1726         /* then process the rest of the work */
1727         mutex_lock(&ifmgd->mtx);
1728
1729         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1730                             IEEE80211_STA_CONNECTION_POLL) &&
1731             ifmgd->associated) {
1732                 u8 bssid[ETH_ALEN];
1733
1734                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1735                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1736                         run_again(ifmgd, ifmgd->probe_timeout);
1737
1738                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1739 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1740                         printk(KERN_DEBUG "No probe response from AP %pM"
1741                                 " after %dms, try %d\n", bssid,
1742                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1743                                 ifmgd->probe_send_count);
1744 #endif
1745                         ieee80211_mgd_probe_ap_send(sdata);
1746                 } else {
1747                         /*
1748                          * We actually lost the connection ... or did we?
1749                          * Let's make sure!
1750                          */
1751                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1752                                           IEEE80211_STA_BEACON_POLL);
1753                         printk(KERN_DEBUG "No probe response from AP %pM"
1754                                 " after %dms, disconnecting.\n",
1755                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1756                         ieee80211_set_disassoc(sdata, true);
1757                         ieee80211_recalc_idle(local);
1758                         mutex_unlock(&ifmgd->mtx);
1759                         /*
1760                          * must be outside lock due to cfg80211,
1761                          * but that's not a problem.
1762                          */
1763                         ieee80211_send_deauth_disassoc(sdata, bssid,
1764                                         IEEE80211_STYPE_DEAUTH,
1765                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1766                                         NULL, true);
1767                         mutex_lock(&ifmgd->mtx);
1768                 }
1769         }
1770
1771         mutex_unlock(&ifmgd->mtx);
1772 }
1773
1774 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1775 {
1776         struct ieee80211_sub_if_data *sdata =
1777                 (struct ieee80211_sub_if_data *) data;
1778         struct ieee80211_local *local = sdata->local;
1779
1780         if (local->quiescing)
1781                 return;
1782
1783         ieee80211_queue_work(&sdata->local->hw,
1784                              &sdata->u.mgd.beacon_connection_loss_work);
1785 }
1786
1787 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1788 {
1789         struct ieee80211_sub_if_data *sdata =
1790                 (struct ieee80211_sub_if_data *) data;
1791         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1792         struct ieee80211_local *local = sdata->local;
1793
1794         if (local->quiescing)
1795                 return;
1796
1797         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1798 }
1799
1800 static void ieee80211_sta_monitor_work(struct work_struct *work)
1801 {
1802         struct ieee80211_sub_if_data *sdata =
1803                 container_of(work, struct ieee80211_sub_if_data,
1804                              u.mgd.monitor_work);
1805
1806         ieee80211_mgd_probe_ap(sdata, false);
1807 }
1808
1809 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1810 {
1811         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1812                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1813                                         IEEE80211_STA_CONNECTION_POLL);
1814
1815                 /* let's probe the connection once */
1816                 ieee80211_queue_work(&sdata->local->hw,
1817                            &sdata->u.mgd.monitor_work);
1818                 /* and do all the other regular work too */
1819                 ieee80211_queue_work(&sdata->local->hw,
1820                            &sdata->u.mgd.work);
1821         }
1822 }
1823
1824 #ifdef CONFIG_PM
1825 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1826 {
1827         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1828
1829         /*
1830          * we need to use atomic bitops for the running bits
1831          * only because both timers might fire at the same
1832          * time -- the code here is properly synchronised.
1833          */
1834
1835         cancel_work_sync(&ifmgd->work);
1836         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1837         if (del_timer_sync(&ifmgd->timer))
1838                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1839
1840         cancel_work_sync(&ifmgd->chswitch_work);
1841         if (del_timer_sync(&ifmgd->chswitch_timer))
1842                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1843
1844         cancel_work_sync(&ifmgd->monitor_work);
1845         /* these will just be re-established on connection */
1846         del_timer_sync(&ifmgd->conn_mon_timer);
1847         del_timer_sync(&ifmgd->bcn_mon_timer);
1848 }
1849
1850 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1851 {
1852         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1853
1854         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1855                 add_timer(&ifmgd->timer);
1856         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1857                 add_timer(&ifmgd->chswitch_timer);
1858 }
1859 #endif
1860
1861 /* interface setup */
1862 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1863 {
1864         struct ieee80211_if_managed *ifmgd;
1865
1866         ifmgd = &sdata->u.mgd;
1867         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1868         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1869         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1870         INIT_WORK(&ifmgd->beacon_connection_loss_work,
1871                   ieee80211_beacon_connection_loss_work);
1872         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1873                     (unsigned long) sdata);
1874         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1875                     (unsigned long) sdata);
1876         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1877                     (unsigned long) sdata);
1878         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1879                     (unsigned long) sdata);
1880         skb_queue_head_init(&ifmgd->skb_queue);
1881
1882         ifmgd->flags = 0;
1883
1884         mutex_init(&ifmgd->mtx);
1885
1886         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1887                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1888         else
1889                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1890 }
1891
1892 /* scan finished notification */
1893 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1894 {
1895         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1896
1897         /* Restart STA timers */
1898         rcu_read_lock();
1899         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1900                 ieee80211_restart_sta_timer(sdata);
1901         rcu_read_unlock();
1902 }
1903
1904 int ieee80211_max_network_latency(struct notifier_block *nb,
1905                                   unsigned long data, void *dummy)
1906 {
1907         s32 latency_usec = (s32) data;
1908         struct ieee80211_local *local =
1909                 container_of(nb, struct ieee80211_local,
1910                              network_latency_notifier);
1911
1912         mutex_lock(&local->iflist_mtx);
1913         ieee80211_recalc_ps(local, latency_usec);
1914         mutex_unlock(&local->iflist_mtx);
1915
1916         return 0;
1917 }
1918
1919 /* config hooks */
1920 static enum work_done_result
1921 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1922                           struct sk_buff *skb)
1923 {
1924         if (!skb) {
1925                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1926                 return WORK_DONE_DESTROY;
1927         }
1928
1929         if (wk->type == IEEE80211_WORK_AUTH) {
1930                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1931                 return WORK_DONE_DESTROY;
1932         }
1933
1934         mutex_lock(&wk->sdata->u.mgd.mtx);
1935         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1936         mutex_unlock(&wk->sdata->u.mgd.mtx);
1937
1938         wk->type = IEEE80211_WORK_AUTH;
1939         wk->probe_auth.tries = 0;
1940         return WORK_DONE_REQUEUE;
1941 }
1942
1943 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1944                        struct cfg80211_auth_request *req)
1945 {
1946         const u8 *ssid;
1947         struct ieee80211_work *wk;
1948         u16 auth_alg;
1949
1950         if (req->local_state_change)
1951                 return 0; /* no need to update mac80211 state */
1952
1953         switch (req->auth_type) {
1954         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1955                 auth_alg = WLAN_AUTH_OPEN;
1956                 break;
1957         case NL80211_AUTHTYPE_SHARED_KEY:
1958                 auth_alg = WLAN_AUTH_SHARED_KEY;
1959                 break;
1960         case NL80211_AUTHTYPE_FT:
1961                 auth_alg = WLAN_AUTH_FT;
1962                 break;
1963         case NL80211_AUTHTYPE_NETWORK_EAP:
1964                 auth_alg = WLAN_AUTH_LEAP;
1965                 break;
1966         default:
1967                 return -EOPNOTSUPP;
1968         }
1969
1970         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1971         if (!wk)
1972                 return -ENOMEM;
1973
1974         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1975
1976         if (req->ie && req->ie_len) {
1977                 memcpy(wk->ie, req->ie, req->ie_len);
1978                 wk->ie_len = req->ie_len;
1979         }
1980
1981         if (req->key && req->key_len) {
1982                 wk->probe_auth.key_len = req->key_len;
1983                 wk->probe_auth.key_idx = req->key_idx;
1984                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1985         }
1986
1987         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1988         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1989         wk->probe_auth.ssid_len = ssid[1];
1990
1991         wk->probe_auth.algorithm = auth_alg;
1992         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1993
1994         /* if we already have a probe, don't probe again */
1995         if (req->bss->proberesp_ies)
1996                 wk->type = IEEE80211_WORK_AUTH;
1997         else
1998                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1999         wk->chan = req->bss->channel;
2000         wk->sdata = sdata;
2001         wk->done = ieee80211_probe_auth_done;
2002
2003         ieee80211_add_work(wk);
2004         return 0;
2005 }
2006
2007 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2008                                                   struct sk_buff *skb)
2009 {
2010         struct ieee80211_mgmt *mgmt;
2011         u16 status;
2012
2013         if (!skb) {
2014                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2015                 return WORK_DONE_DESTROY;
2016         }
2017
2018         mgmt = (void *)skb->data;
2019         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2020
2021         if (status == WLAN_STATUS_SUCCESS) {
2022                 mutex_lock(&wk->sdata->u.mgd.mtx);
2023                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2024                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2025                         /* oops -- internal error -- send timeout for now */
2026                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2027                                                     wk->filter_ta);
2028                         return WORK_DONE_DESTROY;
2029                 }
2030                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2031         }
2032
2033         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2034         return WORK_DONE_DESTROY;
2035 }
2036
2037 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2038                         struct cfg80211_assoc_request *req)
2039 {
2040         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2041         struct ieee80211_bss *bss = (void *)req->bss->priv;
2042         struct ieee80211_work *wk;
2043         const u8 *ssid;
2044         int i;
2045
2046         mutex_lock(&ifmgd->mtx);
2047         if (ifmgd->associated) {
2048                 if (!req->prev_bssid ||
2049                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2050                            ETH_ALEN)) {
2051                         /*
2052                          * We are already associated and the request was not a
2053                          * reassociation request from the current BSS, so
2054                          * reject it.
2055                          */
2056                         mutex_unlock(&ifmgd->mtx);
2057                         return -EALREADY;
2058                 }
2059
2060                 /* Trying to reassociate - clear previous association state */
2061                 ieee80211_set_disassoc(sdata, true);
2062         }
2063         mutex_unlock(&ifmgd->mtx);
2064
2065         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2066         if (!wk)
2067                 return -ENOMEM;
2068
2069         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2070         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2071
2072         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2073                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2074                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2075                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2076                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2077
2078
2079         if (req->ie && req->ie_len) {
2080                 memcpy(wk->ie, req->ie, req->ie_len);
2081                 wk->ie_len = req->ie_len;
2082         } else
2083                 wk->ie_len = 0;
2084
2085         wk->assoc.bss = req->bss;
2086
2087         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2088
2089         /* new association always uses requested smps mode */
2090         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2091                 if (ifmgd->powersave)
2092                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2093                 else
2094                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2095         } else
2096                 ifmgd->ap_smps = ifmgd->req_smps;
2097
2098         wk->assoc.smps = ifmgd->ap_smps;
2099         /*
2100          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2101          * We still associate in non-HT mode (11a/b/g) if any one of these
2102          * ciphers is configured as pairwise.
2103          * We can set this to true for non-11n hardware, that'll be checked
2104          * separately along with the peer capabilities.
2105          */
2106         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2107         wk->assoc.capability = req->bss->capability;
2108         wk->assoc.wmm_used = bss->wmm_used;
2109         wk->assoc.supp_rates = bss->supp_rates;
2110         wk->assoc.supp_rates_len = bss->supp_rates_len;
2111         wk->assoc.ht_information_ie =
2112                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2113
2114         if (bss->wmm_used && bss->uapsd_supported &&
2115             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2116                 wk->assoc.uapsd_used = true;
2117                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2118         } else {
2119                 wk->assoc.uapsd_used = false;
2120                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2121         }
2122
2123         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2124         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2125         wk->assoc.ssid_len = ssid[1];
2126
2127         if (req->prev_bssid)
2128                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2129
2130         wk->type = IEEE80211_WORK_ASSOC;
2131         wk->chan = req->bss->channel;
2132         wk->sdata = sdata;
2133         wk->done = ieee80211_assoc_done;
2134
2135         if (req->use_mfp) {
2136                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2137                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2138         } else {
2139                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2140                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2141         }
2142
2143         if (req->crypto.control_port)
2144                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2145         else
2146                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2147
2148         ieee80211_add_work(wk);
2149         return 0;
2150 }
2151
2152 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2153                          struct cfg80211_deauth_request *req,
2154                          void *cookie)
2155 {
2156         struct ieee80211_local *local = sdata->local;
2157         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2158         struct ieee80211_work *wk;
2159         const u8 *bssid = req->bss->bssid;
2160
2161         mutex_lock(&ifmgd->mtx);
2162
2163         if (ifmgd->associated == req->bss) {
2164                 bssid = req->bss->bssid;
2165                 ieee80211_set_disassoc(sdata, true);
2166                 mutex_unlock(&ifmgd->mtx);
2167         } else {
2168                 bool not_auth_yet = false;
2169
2170                 mutex_unlock(&ifmgd->mtx);
2171
2172                 mutex_lock(&local->work_mtx);
2173                 list_for_each_entry(wk, &local->work_list, list) {
2174                         if (wk->sdata != sdata)
2175                                 continue;
2176
2177                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2178                             wk->type != IEEE80211_WORK_AUTH)
2179                                 continue;
2180
2181                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2182                                 continue;
2183
2184                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2185                         list_del_rcu(&wk->list);
2186                         free_work(wk);
2187                         break;
2188                 }
2189                 mutex_unlock(&local->work_mtx);
2190
2191                 /*
2192                  * If somebody requests authentication and we haven't
2193                  * sent out an auth frame yet there's no need to send
2194                  * out a deauth frame either. If the state was PROBE,
2195                  * then this is the case. If it's AUTH we have sent a
2196                  * frame, and if it's IDLE we have completed the auth
2197                  * process already.
2198                  */
2199                 if (not_auth_yet) {
2200                         __cfg80211_auth_canceled(sdata->dev, bssid);
2201                         return 0;
2202                 }
2203         }
2204
2205         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2206                sdata->name, bssid, req->reason_code);
2207
2208         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2209                                        req->reason_code, cookie,
2210                                        !req->local_state_change);
2211
2212         ieee80211_recalc_idle(sdata->local);
2213
2214         return 0;
2215 }
2216
2217 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2218                            struct cfg80211_disassoc_request *req,
2219                            void *cookie)
2220 {
2221         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2222         u8 bssid[ETH_ALEN];
2223
2224         mutex_lock(&ifmgd->mtx);
2225
2226         /*
2227          * cfg80211 should catch this ... but it's racy since
2228          * we can receive a disassoc frame, process it, hand it
2229          * to cfg80211 while that's in a locked section already
2230          * trying to tell us that the user wants to disconnect.
2231          */
2232         if (ifmgd->associated != req->bss) {
2233                 mutex_unlock(&ifmgd->mtx);
2234                 return -ENOLINK;
2235         }
2236
2237         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2238                sdata->name, req->bss->bssid, req->reason_code);
2239
2240         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2241         ieee80211_set_disassoc(sdata, false);
2242
2243         mutex_unlock(&ifmgd->mtx);
2244
2245         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2246                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2247                         cookie, !req->local_state_change);
2248         sta_info_destroy_addr(sdata, bssid);
2249
2250         ieee80211_recalc_idle(sdata->local);
2251
2252         return 0;
2253 }
2254
2255 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2256                          struct ieee80211_channel *chan,
2257                          enum nl80211_channel_type channel_type,
2258                          const u8 *buf, size_t len, u64 *cookie)
2259 {
2260         struct ieee80211_local *local = sdata->local;
2261         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2262         struct sk_buff *skb;
2263
2264         /* Check that we are on the requested channel for transmission */
2265         if ((chan != local->tmp_channel ||
2266              channel_type != local->tmp_channel_type) &&
2267             (chan != local->oper_channel ||
2268              channel_type != local->oper_channel_type))
2269                 return -EBUSY;
2270
2271         skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2272         if (!skb)
2273                 return -ENOMEM;
2274         skb_reserve(skb, local->hw.extra_tx_headroom);
2275
2276         memcpy(skb_put(skb, len), buf, len);
2277
2278         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2279                 IEEE80211_SKB_CB(skb)->flags |=
2280                         IEEE80211_TX_INTFL_DONT_ENCRYPT;
2281         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2282                 IEEE80211_TX_CTL_REQ_TX_STATUS;
2283         skb->dev = sdata->dev;
2284         ieee80211_tx_skb(sdata, skb);
2285
2286         *cookie = (unsigned long) skb;
2287         return 0;
2288 }
2289
2290 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2291                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2292                                gfp_t gfp)
2293 {
2294         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2295
2296         trace_api_cqm_rssi_notify(sdata, rssi_event);
2297
2298         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2299 }
2300 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);