net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/pm_qos_params.h>
  21 #include <linux/crc32.h>
  22 #include <linux/slab.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "driver-ops.h"
  28 #include "rate.h"
  29 #include "led.h"
  30
  31 #define IEEE80211_MAX_PROBE_TRIES 5
  32
  33 /*
  34  * beacon loss detection timeout
  35  * XXX: should depend on beacon interval
  36  */
  37 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
  38 /*
  39  * Time the connection can be idle before we probe
  40  * it to see if we can still talk to the AP.
  41  */
  42 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  43 /*
  44  * Time we wait for a probe response after sending
  45  * a probe request because of beacon loss or for
  46  * checking the connection still works.
  47  */
  48 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  49
  50 /*
  51  * Weight given to the latest Beacon frame when calculating average signal
  52  * strength for Beacon frames received in the current BSS. This must be
  53  * between 1 and 15.
  54  */
  55 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  56
  57 #define TMR_RUNNING_TIMER       0
  58 #define TMR_RUNNING_CHANSW      1
  59
  60 /*
  61  * All cfg80211 functions have to be called outside a locked
  62  * section so that they can acquire a lock themselves... This
  63  * is much simpler than queuing up things in cfg80211, but we
  64  * do need some indirection for that here.
  65  */
  66 enum rx_mgmt_action {
  67         /* no action required */
  68         RX_MGMT_NONE,
  69
  70         /* caller must call cfg80211_send_rx_auth() */
  71         RX_MGMT_CFG80211_AUTH,
  72
  73         /* caller must call cfg80211_send_rx_assoc() */
  74         RX_MGMT_CFG80211_ASSOC,
  75
  76         /* caller must call cfg80211_send_deauth() */
  77         RX_MGMT_CFG80211_DEAUTH,
  78
  79         /* caller must call cfg80211_send_disassoc() */
  80         RX_MGMT_CFG80211_DISASSOC,
  81
  82         /* caller must tell cfg80211 about internal error */
  83         RX_MGMT_CFG80211_ASSOC_ERROR,
  84 };
  85
  86 /* utils */
  87 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  88 {
  89         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  90 }
  91
  92 /*
  93  * We can have multiple work items (and connection probing)
  94  * scheduling this timer, but we need to take care to only
  95  * reschedule it when it should fire _earlier_ than it was
  96  * asked for before, or if it's not pending right now. This
  97  * function ensures that. Note that it then is required to
  98  * run this function for all timeouts after the first one
  99  * has happened -- the work that runs from this timer will
 100  * do that.
 101  */
 102 static void run_again(struct ieee80211_if_managed *ifmgd,
 103                              unsigned long timeout)
 104 {
 105         ASSERT_MGD_MTX(ifmgd);
 106
 107         if (!timer_pending(&ifmgd->timer) ||
 108             time_before(timeout, ifmgd->timer.expires))
 109                 mod_timer(&ifmgd->timer, timeout);
 110 }
 111
 112 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 113 {
 114         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 115                 return;
 116
 117         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 118                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 119 }
 120
 121 static int ecw2cw(int ecw)
 122 {
 123         return (1 << ecw) - 1;
 124 }
 125
 126 /*
 127  * ieee80211_enable_ht should be called only after the operating band
 128  * has been determined as ht configuration depends on the hw's
 129  * HT abilities for a specific band.
 130  */
 131 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 132                                struct ieee80211_ht_info *hti,
 133                                const u8 *bssid, u16 ap_ht_cap_flags)
 134 {
 135         struct ieee80211_local *local = sdata->local;
 136         struct ieee80211_supported_band *sband;
 137         struct sta_info *sta;
 138         u32 changed = 0;
 139         u16 ht_opmode;
 140         bool enable_ht = true;
 141         enum nl80211_channel_type prev_chantype;
 142         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 143
 144         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 145
 146         prev_chantype = sdata->vif.bss_conf.channel_type;
 147
 148         /* HT is not supported */
 149         if (!sband->ht_cap.ht_supported)
 150                 enable_ht = false;
 151
 152         /* check that channel matches the right operating channel */
 153         if (local->hw.conf.channel->center_freq !=
 154             ieee80211_channel_to_frequency(hti->control_chan))
 155                 enable_ht = false;
 156
 157         if (enable_ht) {
 158                 channel_type = NL80211_CHAN_HT20;
 159
 160                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 161                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 162                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 163                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 164                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 165                                 if (!(local->hw.conf.channel->flags &
 166                                     IEEE80211_CHAN_NO_HT40PLUS))
 167                                         channel_type = NL80211_CHAN_HT40PLUS;
 168                                 break;
 169                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 170                                 if (!(local->hw.conf.channel->flags &
 171                                     IEEE80211_CHAN_NO_HT40MINUS))
 172                                         channel_type = NL80211_CHAN_HT40MINUS;
 173                                 break;
 174                         }
 175                 }
 176         }
 177
 178         if (local->tmp_channel)
 179                 local->tmp_channel_type = channel_type;
 180
 181         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 182                 /* can only fail due to HT40+/- mismatch */
 183                 channel_type = NL80211_CHAN_HT20;
 184                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 185         }
 186
 187         /* channel_type change automatically detected */
 188         ieee80211_hw_config(local, 0);
 189
 190         if (prev_chantype != channel_type) {
 191                 rcu_read_lock();
 192                 sta = sta_info_get(sdata, bssid);
 193                 if (sta)
 194                         rate_control_rate_update(local, sband, sta,
 195                                                  IEEE80211_RC_HT_CHANGED,
 196                                                  channel_type);
 197                 rcu_read_unlock();
 198         }
 199
 200         ht_opmode = le16_to_cpu(hti->operation_mode);
 201
 202         /* if bss configuration changed store the new one */
 203         if (sdata->ht_opmode_valid != enable_ht ||
 204             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 205             prev_chantype != channel_type) {
 206                 changed |= BSS_CHANGED_HT;
 207                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 208                 sdata->ht_opmode_valid = enable_ht;
 209         }
 210
 211         return changed;
 212 }
 213
 214 /* frame sending functions */
 215
 216 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 217                                            const u8 *bssid, u16 stype, u16 reason,
 218                                            void *cookie, bool send_frame)
 219 {
 220         struct ieee80211_local *local = sdata->local;
 221         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 222         struct sk_buff *skb;
 223         struct ieee80211_mgmt *mgmt;
 224
 225         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 226         if (!skb) {
 227                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 228                        "deauth/disassoc frame\n", sdata->name);
 229                 return;
 230         }
 231         skb_reserve(skb, local->hw.extra_tx_headroom);
 232
 233         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 234         memset(mgmt, 0, 24);
 235         memcpy(mgmt->da, bssid, ETH_ALEN);
 236         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 237         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 238         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 239         skb_put(skb, 2);
 240         /* u.deauth.reason_code == u.disassoc.reason_code */
 241         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 242
 243         if (stype == IEEE80211_STYPE_DEAUTH)
 244                 if (cookie)
 245                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 246                 else
 247                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 248         else
 249                 if (cookie)
 250                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 251                 else
 252                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 253         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 254                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 255
 256         if (send_frame)
 257                 ieee80211_tx_skb(sdata, skb);
 258         else
 259                 kfree_skb(skb);
 260 }
 261
 262 void ieee80211_send_pspoll(struct ieee80211_local *local,
 263                            struct ieee80211_sub_if_data *sdata)
 264 {
 265         struct ieee80211_pspoll *pspoll;
 266         struct sk_buff *skb;
 267
 268         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 269         if (!skb)
 270                 return;
 271
 272         pspoll = (struct ieee80211_pspoll *) skb->data;
 273         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 274
 275         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 276         ieee80211_tx_skb(sdata, skb);
 277 }
 278
 279 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 280                              struct ieee80211_sub_if_data *sdata,
 281                              int powersave)
 282 {
 283         struct sk_buff *skb;
 284         struct ieee80211_hdr_3addr *nullfunc;
 285
 286         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 287         if (!skb)
 288                 return;
 289
 290         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 291         if (powersave)
 292                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 293
 294         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 295         ieee80211_tx_skb(sdata, skb);
 296 }
 297
 298 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 299                                           struct ieee80211_sub_if_data *sdata)
 300 {
 301         struct sk_buff *skb;
 302         struct ieee80211_hdr *nullfunc;
 303         __le16 fc;
 304
 305         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 306                 return;
 307
 308         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 309         if (!skb) {
 310                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 311                        "nullfunc frame\n", sdata->name);
 312                 return;
 313         }
 314         skb_reserve(skb, local->hw.extra_tx_headroom);
 315
 316         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 317         memset(nullfunc, 0, 30);
 318         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 319                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 320         nullfunc->frame_control = fc;
 321         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 322         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 323         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 324         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 325
 326         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 327         ieee80211_tx_skb(sdata, skb);
 328 }
 329
 330 /* spectrum management related things */
 331 static void ieee80211_chswitch_work(struct work_struct *work)
 332 {
 333         struct ieee80211_sub_if_data *sdata =
 334                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 335         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 336
 337         if (!ieee80211_sdata_running(sdata))
 338                 return;
 339
 340         mutex_lock(&ifmgd->mtx);
 341         if (!ifmgd->associated)
 342                 goto out;
 343
 344         sdata->local->oper_channel = sdata->local->csa_channel;
 345         if (!sdata->local->ops->channel_switch) {
 346                 /* call "hw_config" only if doing sw channel switch */
 347                 ieee80211_hw_config(sdata->local,
 348                         IEEE80211_CONF_CHANGE_CHANNEL);
 349         }
 350
 351         /* XXX: shouldn't really modify cfg80211-owned data! */
 352         ifmgd->associated->channel = sdata->local->oper_channel;
 353
 354         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 355                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 356  out:
 357         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 358         mutex_unlock(&ifmgd->mtx);
 359 }
 360
 361 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 362 {
 363         struct ieee80211_sub_if_data *sdata;
 364         struct ieee80211_if_managed *ifmgd;
 365
 366         sdata = vif_to_sdata(vif);
 367         ifmgd = &sdata->u.mgd;
 368
 369         trace_api_chswitch_done(sdata, success);
 370         if (!success) {
 371                 /*
 372                  * If the channel switch was not successful, stay
 373                  * around on the old channel. We currently lack
 374                  * good handling of this situation, possibly we
 375                  * should just drop the association.
 376                  */
 377                 sdata->local->csa_channel = sdata->local->oper_channel;
 378         }
 379
 380         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 381 }
 382 EXPORT_SYMBOL(ieee80211_chswitch_done);
 383
 384 static void ieee80211_chswitch_timer(unsigned long data)
 385 {
 386         struct ieee80211_sub_if_data *sdata =
 387                 (struct ieee80211_sub_if_data *) data;
 388         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 389
 390         if (sdata->local->quiescing) {
 391                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 392                 return;
 393         }
 394
 395         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 396 }
 397
 398 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 399                                       struct ieee80211_channel_sw_ie *sw_elem,
 400                                       struct ieee80211_bss *bss,
 401                                       u64 timestamp)
 402 {
 403         struct cfg80211_bss *cbss =
 404                 container_of((void *)bss, struct cfg80211_bss, priv);
 405         struct ieee80211_channel *new_ch;
 406         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 407         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 408
 409         ASSERT_MGD_MTX(ifmgd);
 410
 411         if (!ifmgd->associated)
 412                 return;
 413
 414         if (sdata->local->scanning)
 415                 return;
 416
 417         /* Disregard subsequent beacons if we are already running a timer
 418            processing a CSA */
 419
 420         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 421                 return;
 422
 423         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 424         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 425                 return;
 426
 427         sdata->local->csa_channel = new_ch;
 428
 429         if (sdata->local->ops->channel_switch) {
 430                 /* use driver's channel switch callback */
 431                 struct ieee80211_channel_switch ch_switch;
 432                 memset(&ch_switch, 0, sizeof(ch_switch));
 433                 ch_switch.timestamp = timestamp;
 434                 if (sw_elem->mode) {
 435                         ch_switch.block_tx = true;
 436                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 437                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 438                 }
 439                 ch_switch.channel = new_ch;
 440                 ch_switch.count = sw_elem->count;
 441                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 442                 drv_channel_switch(sdata->local, &ch_switch);
 443                 return;
 444         }
 445
 446         /* channel switch handled in software */
 447         if (sw_elem->count <= 1) {
 448                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 449         } else {
 450                 if (sw_elem->mode)
 451                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 452                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 453                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 454                 mod_timer(&ifmgd->chswitch_timer,
 455                           jiffies +
 456                           msecs_to_jiffies(sw_elem->count *
 457                                            cbss->beacon_interval));
 458         }
 459 }
 460
 461 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 462                                         u16 capab_info, u8 *pwr_constr_elem,
 463                                         u8 pwr_constr_elem_len)
 464 {
 465         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 466
 467         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 468                 return;
 469
 470         /* Power constraint IE length should be 1 octet */
 471         if (pwr_constr_elem_len != 1)
 472                 return;
 473
 474         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 475             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 476                 sdata->local->power_constr_level = *pwr_constr_elem;
 477                 ieee80211_hw_config(sdata->local, 0);
 478         }
 479 }
 480
 481 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 482 {
 483         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 484         struct ieee80211_local *local = sdata->local;
 485         struct ieee80211_conf *conf = &local->hw.conf;
 486
 487         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 488                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 489                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 490
 491         local->disable_dynamic_ps = false;
 492         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 493 }
 494 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 495
 496 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 497 {
 498         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 499         struct ieee80211_local *local = sdata->local;
 500         struct ieee80211_conf *conf = &local->hw.conf;
 501
 502         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 503                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 504                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 505
 506         local->disable_dynamic_ps = true;
 507         conf->dynamic_ps_timeout = 0;
 508         del_timer_sync(&local->dynamic_ps_timer);
 509         ieee80211_queue_work(&local->hw,
 510                              &local->dynamic_ps_enable_work);
 511 }
 512 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 513
 514 /* powersave */
 515 static void ieee80211_enable_ps(struct ieee80211_local *local,
 516                                 struct ieee80211_sub_if_data *sdata)
 517 {
 518         struct ieee80211_conf *conf = &local->hw.conf;
 519
 520         /*
 521          * If we are scanning right now then the parameters will
 522          * take effect when scan finishes.
 523          */
 524         if (local->scanning)
 525                 return;
 526
 527         if (conf->dynamic_ps_timeout > 0 &&
 528             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 529                 mod_timer(&local->dynamic_ps_timer, jiffies +
 530                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 531         } else {
 532                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 533                         ieee80211_send_nullfunc(local, sdata, 1);
 534
 535                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 536                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 537                         return;
 538
 539                 conf->flags |= IEEE80211_CONF_PS;
 540                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 541         }
 542 }
 543
 544 static void ieee80211_change_ps(struct ieee80211_local *local)
 545 {
 546         struct ieee80211_conf *conf = &local->hw.conf;
 547
 548         if (local->ps_sdata) {
 549                 ieee80211_enable_ps(local, local->ps_sdata);
 550         } else if (conf->flags & IEEE80211_CONF_PS) {
 551                 conf->flags &= ~IEEE80211_CONF_PS;
 552                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 553                 del_timer_sync(&local->dynamic_ps_timer);
 554                 cancel_work_sync(&local->dynamic_ps_enable_work);
 555         }
 556 }
 557
 558 /* need to hold RTNL or interface lock */
 559 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 560 {
 561         struct ieee80211_sub_if_data *sdata, *found = NULL;
 562         int count = 0;
 563         int timeout;
 564
 565         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 566                 local->ps_sdata = NULL;
 567                 return;
 568         }
 569
 570         if (!list_empty(&local->work_list)) {
 571                 local->ps_sdata = NULL;
 572                 goto change;
 573         }
 574
 575         list_for_each_entry(sdata, &local->interfaces, list) {
 576                 if (!ieee80211_sdata_running(sdata))
 577                         continue;
 578                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 579                         continue;
 580                 found = sdata;
 581                 count++;
 582         }
 583
 584         if (count == 1 && found->u.mgd.powersave &&
 585             found->u.mgd.associated &&
 586             found->u.mgd.associated->beacon_ies &&
 587             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 588                                     IEEE80211_STA_CONNECTION_POLL))) {
 589                 struct ieee80211_conf *conf = &local->hw.conf;
 590                 s32 beaconint_us;
 591
 592                 if (latency < 0)
 593                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 594
 595                 beaconint_us = ieee80211_tu_to_usec(
 596                                         found->vif.bss_conf.beacon_int);
 597
 598                 timeout = local->dynamic_ps_forced_timeout;
 599                 if (timeout < 0) {
 600                         /*
 601                          * Go to full PSM if the user configures a very low
 602                          * latency requirement.
 603                          * The 2 second value is there for compatibility until
 604                          * the PM_QOS_NETWORK_LATENCY is configured with real
 605                          * values.
 606                          */
 607                         if (latency > 1900000000 && latency != 2000000000)
 608                                 timeout = 0;
 609                         else
 610                                 timeout = 100;
 611                 }
 612                 local->dynamic_ps_user_timeout = timeout;
 613                 if (!local->disable_dynamic_ps)
 614                         conf->dynamic_ps_timeout =
 615                                 local->dynamic_ps_user_timeout;
 616
 617                 if (beaconint_us > latency) {
 618                         local->ps_sdata = NULL;
 619                 } else {
 620                         struct ieee80211_bss *bss;
 621                         int maxslp = 1;
 622                         u8 dtimper;
 623
 624                         bss = (void *)found->u.mgd.associated->priv;
 625                         dtimper = bss->dtim_period;
 626
 627                         /* If the TIM IE is invalid, pretend the value is 1 */
 628                         if (!dtimper)
 629                                 dtimper = 1;
 630                         else if (dtimper > 1)
 631                                 maxslp = min_t(int, dtimper,
 632                                                     latency / beaconint_us);
 633
 634                         local->hw.conf.max_sleep_period = maxslp;
 635                         local->hw.conf.ps_dtim_period = dtimper;
 636                         local->ps_sdata = found;
 637                 }
 638         } else {
 639                 local->ps_sdata = NULL;
 640         }
 641
 642  change:
 643         ieee80211_change_ps(local);
 644 }
 645
 646 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 647 {
 648         struct ieee80211_local *local =
 649                 container_of(work, struct ieee80211_local,
 650                              dynamic_ps_disable_work);
 651
 652         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 653                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 654                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 655         }
 656
 657         ieee80211_wake_queues_by_reason(&local->hw,
 658                                         IEEE80211_QUEUE_STOP_REASON_PS);
 659 }
 660
 661 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 662 {
 663         struct ieee80211_local *local =
 664                 container_of(work, struct ieee80211_local,
 665                              dynamic_ps_enable_work);
 666         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 667         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 668
 669         /* can only happen when PS was just disabled anyway */
 670         if (!sdata)
 671                 return;
 672
 673         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 674                 return;
 675
 676         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 677             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 678                 ieee80211_send_nullfunc(local, sdata, 1);
 679
 680         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 681               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 682             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 683                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 684                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 685                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 686         }
 687 }
 688
 689 void ieee80211_dynamic_ps_timer(unsigned long data)
 690 {
 691         struct ieee80211_local *local = (void *) data;
 692
 693         if (local->quiescing || local->suspended)
 694                 return;
 695
 696         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 697 }
 698
 699 /* MLME */
 700 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 701                                      struct ieee80211_sub_if_data *sdata,
 702                                      u8 *wmm_param, size_t wmm_param_len)
 703 {
 704         struct ieee80211_tx_queue_params params;
 705         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 706         size_t left;
 707         int count;
 708         u8 *pos, uapsd_queues = 0;
 709
 710         if (!local->ops->conf_tx)
 711                 return;
 712
 713         if (local->hw.queues < 4)
 714                 return;
 715
 716         if (!wmm_param)
 717                 return;
 718
 719         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 720                 return;
 721
 722         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 723                 uapsd_queues = local->uapsd_queues;
 724
 725         count = wmm_param[6] & 0x0f;
 726         if (count == ifmgd->wmm_last_param_set)
 727                 return;
 728         ifmgd->wmm_last_param_set = count;
 729
 730         pos = wmm_param + 8;
 731         left = wmm_param_len - 8;
 732
 733         memset(&params, 0, sizeof(params));
 734
 735         local->wmm_acm = 0;
 736         for (; left >= 4; left -= 4, pos += 4) {
 737                 int aci = (pos[0] >> 5) & 0x03;
 738                 int acm = (pos[0] >> 4) & 0x01;
 739                 bool uapsd = false;
 740                 int queue;
 741
 742                 switch (aci) {
 743                 case 1: /* AC_BK */
 744                         queue = 3;
 745                         if (acm)
 746                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 747                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 748                                 uapsd = true;
 749                         break;
 750                 case 2: /* AC_VI */
 751                         queue = 1;
 752                         if (acm)
 753                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 754                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 755                                 uapsd = true;
 756                         break;
 757                 case 3: /* AC_VO */
 758                         queue = 0;
 759                         if (acm)
 760                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 761                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 762                                 uapsd = true;
 763                         break;
 764                 case 0: /* AC_BE */
 765                 default:
 766                         queue = 2;
 767                         if (acm)
 768                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 769                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 770                                 uapsd = true;
 771                         break;
 772                 }
 773
 774                 params.aifs = pos[0] & 0x0f;
 775                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 776                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 777                 params.txop = get_unaligned_le16(pos + 2);
 778                 params.uapsd = uapsd;
 779
 780 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 781                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 782                        "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 783                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 784                        params.aifs, params.cw_min, params.cw_max, params.txop,
 785                        params.uapsd);
 786 #endif
 787                 if (drv_conf_tx(local, queue, &params))
 788                         printk(KERN_DEBUG "%s: failed to set TX queue "
 789                                "parameters for queue %d\n",
 790                                wiphy_name(local->hw.wiphy), queue);
 791         }
 792
 793         /* enable WMM or activate new settings */
 794         sdata->vif.bss_conf.qos = true;
 795         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 796 }
 797
 798 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 799                                            u16 capab, bool erp_valid, u8 erp)
 800 {
 801         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 802         u32 changed = 0;
 803         bool use_protection;
 804         bool use_short_preamble;
 805         bool use_short_slot;
 806
 807         if (erp_valid) {
 808                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 809                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 810         } else {
 811                 use_protection = false;
 812                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 813         }
 814
 815         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 816         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 817                 use_short_slot = true;
 818
 819         if (use_protection != bss_conf->use_cts_prot) {
 820                 bss_conf->use_cts_prot = use_protection;
 821                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 822         }
 823
 824         if (use_short_preamble != bss_conf->use_short_preamble) {
 825                 bss_conf->use_short_preamble = use_short_preamble;
 826                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 827         }
 828
 829         if (use_short_slot != bss_conf->use_short_slot) {
 830                 bss_conf->use_short_slot = use_short_slot;
 831                 changed |= BSS_CHANGED_ERP_SLOT;
 832         }
 833
 834         return changed;
 835 }
 836
 837 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 838                                      struct cfg80211_bss *cbss,
 839                                      u32 bss_info_changed)
 840 {
 841         struct ieee80211_bss *bss = (void *)cbss->priv;
 842         struct ieee80211_local *local = sdata->local;
 843         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 844
 845         bss_info_changed |= BSS_CHANGED_ASSOC;
 846         /* set timing information */
 847         bss_conf->beacon_int = cbss->beacon_interval;
 848         bss_conf->timestamp = cbss->tsf;
 849
 850         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 851         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 852                 cbss->capability, bss->has_erp_value, bss->erp_value);
 853
 854         sdata->u.mgd.associated = cbss;
 855         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 856
 857         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 858
 859         /* just to be sure */
 860         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 861                                 IEEE80211_STA_BEACON_POLL);
 862
 863         /*
 864          * Always handle WMM once after association regardless
 865          * of the first value the AP uses. Setting -1 here has
 866          * that effect because the AP values is an unsigned
 867          * 4-bit value.
 868          */
 869         sdata->u.mgd.wmm_last_param_set = -1;
 870
 871         ieee80211_led_assoc(local, 1);
 872
 873         bss_conf->assoc = 1;
 874         /*
 875          * For now just always ask the driver to update the basic rateset
 876          * when we have associated, we aren't checking whether it actually
 877          * changed or not.
 878          */
 879         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 880
 881         /* And the BSSID changed - we're associated now */
 882         bss_info_changed |= BSS_CHANGED_BSSID;
 883
 884         /* Tell the driver to monitor connection quality (if supported) */
 885         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 886             bss_conf->cqm_rssi_thold)
 887                 bss_info_changed |= BSS_CHANGED_CQM;
 888
 889         /* Enable ARP filtering */
 890         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
 891                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 892                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
 893         }
 894
 895         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 896
 897         mutex_lock(&local->iflist_mtx);
 898         ieee80211_recalc_ps(local, -1);
 899         ieee80211_recalc_smps(local, sdata);
 900         mutex_unlock(&local->iflist_mtx);
 901
 902         netif_tx_start_all_queues(sdata->dev);
 903         netif_carrier_on(sdata->dev);
 904 }
 905
 906 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 907                                    bool remove_sta)
 908 {
 909         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 910         struct ieee80211_local *local = sdata->local;
 911         struct sta_info *sta;
 912         u32 changed = 0, config_changed = 0;
 913         u8 bssid[ETH_ALEN];
 914
 915         ASSERT_MGD_MTX(ifmgd);
 916
 917         if (WARN_ON(!ifmgd->associated))
 918                 return;
 919
 920         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 921
 922         ifmgd->associated = NULL;
 923         memset(ifmgd->bssid, 0, ETH_ALEN);
 924
 925         /*
 926          * we need to commit the associated = NULL change because the
 927          * scan code uses that to determine whether this iface should
 928          * go to/wake up from powersave or not -- and could otherwise
 929          * wake the queues erroneously.
 930          */
 931         smp_mb();
 932
 933         /*
 934          * Thus, we can only afterwards stop the queues -- to account
 935          * for the case where another CPU is finishing a scan at this
 936          * time -- we don't want the scan code to enable queues.
 937          */
 938
 939         netif_tx_stop_all_queues(sdata->dev);
 940         netif_carrier_off(sdata->dev);
 941
 942         mutex_lock(&local->sta_mtx);
 943         sta = sta_info_get(sdata, bssid);
 944         if (sta) {
 945                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
 946                 ieee80211_sta_tear_down_BA_sessions(sta);
 947         }
 948         mutex_unlock(&local->sta_mtx);
 949
 950         changed |= ieee80211_reset_erp_info(sdata);
 951
 952         ieee80211_led_assoc(local, 0);
 953         changed |= BSS_CHANGED_ASSOC;
 954         sdata->vif.bss_conf.assoc = false;
 955
 956         ieee80211_set_wmm_default(sdata);
 957
 958         /* channel(_type) changes are handled by ieee80211_hw_config */
 959         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
 960
 961         /* on the next assoc, re-program HT parameters */
 962         sdata->ht_opmode_valid = false;
 963
 964         local->power_constr_level = 0;
 965
 966         del_timer_sync(&local->dynamic_ps_timer);
 967         cancel_work_sync(&local->dynamic_ps_enable_work);
 968
 969         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 970                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 971                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 972         }
 973
 974         ieee80211_hw_config(local, config_changed);
 975
 976         /* Disable ARP filtering */
 977         if (sdata->vif.bss_conf.arp_filter_enabled) {
 978                 sdata->vif.bss_conf.arp_filter_enabled = false;
 979                 changed |= BSS_CHANGED_ARP_FILTER;
 980         }
 981
 982         /* The BSSID (not really interesting) and HT changed */
 983         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
 984         ieee80211_bss_info_change_notify(sdata, changed);
 985
 986         if (remove_sta)
 987                 sta_info_destroy_addr(sdata, bssid);
 988 }
 989
 990 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 991                              struct ieee80211_hdr *hdr)
 992 {
 993         /*
 994          * We can postpone the mgd.timer whenever receiving unicast frames
 995          * from AP because we know that the connection is working both ways
 996          * at that time. But multicast frames (and hence also beacons) must
 997          * be ignored here, because we need to trigger the timer during
 998          * data idle periods for sending the periodic probe request to the
 999          * AP we're connected to.
1000          */
1001         if (is_multicast_ether_addr(hdr->addr1))
1002                 return;
1003
1004         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1005                 return;
1006
1007         mod_timer(&sdata->u.mgd.conn_mon_timer,
1008                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1009 }
1010
1011 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1012 {
1013         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1014         const u8 *ssid;
1015
1016         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1017         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
1018                                  ssid + 2, ssid[1], NULL, 0);
1019
1020         ifmgd->probe_send_count++;
1021         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1022         run_again(ifmgd, ifmgd->probe_timeout);
1023 }
1024
1025 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1026                                    bool beacon)
1027 {
1028         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1029         bool already = false;
1030
1031         if (!ieee80211_sdata_running(sdata))
1032                 return;
1033
1034         if (sdata->local->scanning)
1035                 return;
1036
1037         if (sdata->local->tmp_channel)
1038                 return;
1039
1040         mutex_lock(&ifmgd->mtx);
1041
1042         if (!ifmgd->associated)
1043                 goto out;
1044
1045 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1046         if (beacon && net_ratelimit())
1047                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1048                        "- sending probe request\n", sdata->name);
1049 #endif
1050
1051         /*
1052          * The driver/our work has already reported this event or the
1053          * connection monitoring has kicked in and we have already sent
1054          * a probe request. Or maybe the AP died and the driver keeps
1055          * reporting until we disassociate...
1056          *
1057          * In either case we have to ignore the current call to this
1058          * function (except for setting the correct probe reason bit)
1059          * because otherwise we would reset the timer every time and
1060          * never check whether we received a probe response!
1061          */
1062         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1063                             IEEE80211_STA_CONNECTION_POLL))
1064                 already = true;
1065
1066         if (beacon)
1067                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1068         else
1069                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1070
1071         if (already)
1072                 goto out;
1073
1074         mutex_lock(&sdata->local->iflist_mtx);
1075         ieee80211_recalc_ps(sdata->local, -1);
1076         mutex_unlock(&sdata->local->iflist_mtx);
1077
1078         ifmgd->probe_send_count = 0;
1079         ieee80211_mgd_probe_ap_send(sdata);
1080  out:
1081         mutex_unlock(&ifmgd->mtx);
1082 }
1083
1084 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1085 {
1086         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1087         struct ieee80211_local *local = sdata->local;
1088         u8 bssid[ETH_ALEN];
1089
1090         mutex_lock(&ifmgd->mtx);
1091         if (!ifmgd->associated) {
1092                 mutex_unlock(&ifmgd->mtx);
1093                 return;
1094         }
1095
1096         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1097
1098         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1099
1100         ieee80211_set_disassoc(sdata, true);
1101         ieee80211_recalc_idle(local);
1102         mutex_unlock(&ifmgd->mtx);
1103         /*
1104          * must be outside lock due to cfg80211,
1105          * but that's not a problem.
1106          */
1107         ieee80211_send_deauth_disassoc(sdata, bssid,
1108                                        IEEE80211_STYPE_DEAUTH,
1109                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1110                                        NULL, true);
1111 }
1112
1113 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1114 {
1115         struct ieee80211_sub_if_data *sdata =
1116                 container_of(work, struct ieee80211_sub_if_data,
1117                              u.mgd.beacon_connection_loss_work);
1118
1119         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1120                 __ieee80211_connection_loss(sdata);
1121         else
1122                 ieee80211_mgd_probe_ap(sdata, true);
1123 }
1124
1125 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1126 {
1127         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1128         struct ieee80211_hw *hw = &sdata->local->hw;
1129
1130         trace_api_beacon_loss(sdata);
1131
1132         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1133         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1134 }
1135 EXPORT_SYMBOL(ieee80211_beacon_loss);
1136
1137 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1138 {
1139         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1140         struct ieee80211_hw *hw = &sdata->local->hw;
1141
1142         trace_api_connection_loss(sdata);
1143
1144         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1145         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1146 }
1147 EXPORT_SYMBOL(ieee80211_connection_loss);
1148
1149
1150 static enum rx_mgmt_action __must_check
1151 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1152                          struct ieee80211_mgmt *mgmt, size_t len)
1153 {
1154         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1155         const u8 *bssid = NULL;
1156         u16 reason_code;
1157
1158         if (len < 24 + 2)
1159                 return RX_MGMT_NONE;
1160
1161         ASSERT_MGD_MTX(ifmgd);
1162
1163         bssid = ifmgd->associated->bssid;
1164
1165         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1166
1167         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1168                         sdata->name, bssid, reason_code);
1169
1170         ieee80211_set_disassoc(sdata, true);
1171         ieee80211_recalc_idle(sdata->local);
1172
1173         return RX_MGMT_CFG80211_DEAUTH;
1174 }
1175
1176
1177 static enum rx_mgmt_action __must_check
1178 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1179                            struct ieee80211_mgmt *mgmt, size_t len)
1180 {
1181         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1182         u16 reason_code;
1183
1184         if (len < 24 + 2)
1185                 return RX_MGMT_NONE;
1186
1187         ASSERT_MGD_MTX(ifmgd);
1188
1189         if (WARN_ON(!ifmgd->associated))
1190                 return RX_MGMT_NONE;
1191
1192         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1193                 return RX_MGMT_NONE;
1194
1195         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1196
1197         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1198                         sdata->name, mgmt->sa, reason_code);
1199
1200         ieee80211_set_disassoc(sdata, true);
1201         ieee80211_recalc_idle(sdata->local);
1202         return RX_MGMT_CFG80211_DISASSOC;
1203 }
1204
1205
1206 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1207                                     struct ieee80211_mgmt *mgmt, size_t len)
1208 {
1209         struct ieee80211_sub_if_data *sdata = wk->sdata;
1210         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1211         struct ieee80211_local *local = sdata->local;
1212         struct ieee80211_supported_band *sband;
1213         struct sta_info *sta;
1214         struct cfg80211_bss *cbss = wk->assoc.bss;
1215         u8 *pos;
1216         u32 rates, basic_rates;
1217         u16 capab_info, aid;
1218         struct ieee802_11_elems elems;
1219         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1220         u32 changed = 0;
1221         int i, j, err;
1222         bool have_higher_than_11mbit = false;
1223         u16 ap_ht_cap_flags;
1224
1225         /* AssocResp and ReassocResp have identical structure */
1226
1227         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1228         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1229
1230         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1231                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1232                        "set\n", sdata->name, aid);
1233         aid &= ~(BIT(15) | BIT(14));
1234
1235         pos = mgmt->u.assoc_resp.variable;
1236         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1237
1238         if (!elems.supp_rates) {
1239                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1240                        sdata->name);
1241                 return false;
1242         }
1243
1244         ifmgd->aid = aid;
1245
1246         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1247         if (!sta) {
1248                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1249                        " the AP\n", sdata->name);
1250                 return false;
1251         }
1252
1253         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1254                            WLAN_STA_ASSOC_AP);
1255         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1256                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1257
1258         rates = 0;
1259         basic_rates = 0;
1260         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1261
1262         for (i = 0; i < elems.supp_rates_len; i++) {
1263                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1264                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1265
1266                 if (rate > 110)
1267                         have_higher_than_11mbit = true;
1268
1269                 for (j = 0; j < sband->n_bitrates; j++) {
1270                         if (sband->bitrates[j].bitrate == rate) {
1271                                 rates |= BIT(j);
1272                                 if (is_basic)
1273                                         basic_rates |= BIT(j);
1274                                 break;
1275                         }
1276                 }
1277         }
1278
1279         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1280                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1281                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1282
1283                 if (rate > 110)
1284                         have_higher_than_11mbit = true;
1285
1286                 for (j = 0; j < sband->n_bitrates; j++) {
1287                         if (sband->bitrates[j].bitrate == rate) {
1288                                 rates |= BIT(j);
1289                                 if (is_basic)
1290                                         basic_rates |= BIT(j);
1291                                 break;
1292                         }
1293                 }
1294         }
1295
1296         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1297         sdata->vif.bss_conf.basic_rates = basic_rates;
1298
1299         /* cf. IEEE 802.11 9.2.12 */
1300         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1301             have_higher_than_11mbit)
1302                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1303         else
1304                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1305
1306         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1307                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1308                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1309
1310         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1311
1312         rate_control_rate_init(sta);
1313
1314         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1315                 set_sta_flags(sta, WLAN_STA_MFP);
1316
1317         if (elems.wmm_param)
1318                 set_sta_flags(sta, WLAN_STA_WME);
1319
1320         err = sta_info_insert(sta);
1321         sta = NULL;
1322         if (err) {
1323                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1324                        " the AP (error %d)\n", sdata->name, err);
1325                 return false;
1326         }
1327
1328         if (elems.wmm_param)
1329                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1330                                          elems.wmm_param_len);
1331         else
1332                 ieee80211_set_wmm_default(sdata);
1333
1334         local->oper_channel = wk->chan;
1335
1336         if (elems.ht_info_elem && elems.wmm_param &&
1337             (sdata->local->hw.queues >= 4) &&
1338             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1339                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1340                                                cbss->bssid, ap_ht_cap_flags);
1341
1342         /* set AID and assoc capability,
1343          * ieee80211_set_associated() will tell the driver */
1344         bss_conf->aid = aid;
1345         bss_conf->assoc_capability = capab_info;
1346         ieee80211_set_associated(sdata, cbss, changed);
1347
1348         /*
1349          * If we're using 4-addr mode, let the AP know that we're
1350          * doing so, so that it can create the STA VLAN on its side
1351          */
1352         if (ifmgd->use_4addr)
1353                 ieee80211_send_4addr_nullfunc(local, sdata);
1354
1355         /*
1356          * Start timer to probe the connection to the AP now.
1357          * Also start the timer that will detect beacon loss.
1358          */
1359         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1360         mod_beacon_timer(sdata);
1361
1362         return true;
1363 }
1364
1365
1366 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1367                                   struct ieee80211_mgmt *mgmt,
1368                                   size_t len,
1369                                   struct ieee80211_rx_status *rx_status,
1370                                   struct ieee802_11_elems *elems,
1371                                   bool beacon)
1372 {
1373         struct ieee80211_local *local = sdata->local;
1374         int freq;
1375         struct ieee80211_bss *bss;
1376         struct ieee80211_channel *channel;
1377         bool need_ps = false;
1378
1379         if (sdata->u.mgd.associated) {
1380                 bss = (void *)sdata->u.mgd.associated->priv;
1381                 /* not previously set so we may need to recalc */
1382                 need_ps = !bss->dtim_period;
1383         }
1384
1385         if (elems->ds_params && elems->ds_params_len == 1)
1386                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1387         else
1388                 freq = rx_status->freq;
1389
1390         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1391
1392         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1393                 return;
1394
1395         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1396                                         channel, beacon);
1397         if (bss)
1398                 ieee80211_rx_bss_put(local, bss);
1399
1400         if (!sdata->u.mgd.associated)
1401                 return;
1402
1403         if (need_ps) {
1404                 mutex_lock(&local->iflist_mtx);
1405                 ieee80211_recalc_ps(local, -1);
1406                 mutex_unlock(&local->iflist_mtx);
1407         }
1408
1409         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1410             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1411                                                         ETH_ALEN) == 0)) {
1412                 struct ieee80211_channel_sw_ie *sw_elem =
1413                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1414                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1415                                                  bss, rx_status->mactime);
1416         }
1417 }
1418
1419
1420 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1421                                          struct sk_buff *skb)
1422 {
1423         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1424         struct ieee80211_if_managed *ifmgd;
1425         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1426         size_t baselen, len = skb->len;
1427         struct ieee802_11_elems elems;
1428
1429         ifmgd = &sdata->u.mgd;
1430
1431         ASSERT_MGD_MTX(ifmgd);
1432
1433         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1434                 return; /* ignore ProbeResp to foreign address */
1435
1436         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1437         if (baselen > len)
1438                 return;
1439
1440         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1441                                 &elems);
1442
1443         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1444
1445         if (ifmgd->associated &&
1446             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1447             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1448                             IEEE80211_STA_CONNECTION_POLL)) {
1449                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1450                                   IEEE80211_STA_BEACON_POLL);
1451                 mutex_lock(&sdata->local->iflist_mtx);
1452                 ieee80211_recalc_ps(sdata->local, -1);
1453                 mutex_unlock(&sdata->local->iflist_mtx);
1454
1455                 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1456                         return;
1457
1458                 /*
1459                  * We've received a probe response, but are not sure whether
1460                  * we have or will be receiving any beacons or data, so let's
1461                  * schedule the timers again, just in case.
1462                  */
1463                 mod_beacon_timer(sdata);
1464
1465                 mod_timer(&ifmgd->conn_mon_timer,
1466                           round_jiffies_up(jiffies +
1467                                            IEEE80211_CONNECTION_IDLE_TIME));
1468         }
1469 }
1470
1471 /*
1472  * This is the canonical list of information elements we care about,
1473  * the filter code also gives us all changes to the Microsoft OUI
1474  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1475  *
1476  * We implement beacon filtering in software since that means we can
1477  * avoid processing the frame here and in cfg80211, and userspace
1478  * will not be able to tell whether the hardware supports it or not.
1479  *
1480  * XXX: This list needs to be dynamic -- userspace needs to be able to
1481  *      add items it requires. It also needs to be able to tell us to
1482  *      look out for other vendor IEs.
1483  */
1484 static const u64 care_about_ies =
1485         (1ULL << WLAN_EID_COUNTRY) |
1486         (1ULL << WLAN_EID_ERP_INFO) |
1487         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1488         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1489         (1ULL << WLAN_EID_HT_CAPABILITY) |
1490         (1ULL << WLAN_EID_HT_INFORMATION);
1491
1492 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1493                                      struct ieee80211_mgmt *mgmt,
1494                                      size_t len,
1495                                      struct ieee80211_rx_status *rx_status)
1496 {
1497         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1498         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1499         size_t baselen;
1500         struct ieee802_11_elems elems;
1501         struct ieee80211_local *local = sdata->local;
1502         u32 changed = 0;
1503         bool erp_valid, directed_tim = false;
1504         u8 erp_value = 0;
1505         u32 ncrc;
1506         u8 *bssid;
1507
1508         ASSERT_MGD_MTX(ifmgd);
1509
1510         /* Process beacon from the current BSS */
1511         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1512         if (baselen > len)
1513                 return;
1514
1515         if (rx_status->freq != local->hw.conf.channel->center_freq)
1516                 return;
1517
1518         /*
1519          * We might have received a number of frames, among them a
1520          * disassoc frame and a beacon...
1521          */
1522         if (!ifmgd->associated)
1523                 return;
1524
1525         bssid = ifmgd->associated->bssid;
1526
1527         /*
1528          * And in theory even frames from a different AP we were just
1529          * associated to a split-second ago!
1530          */
1531         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1532                 return;
1533
1534         /* Track average RSSI from the Beacon frames of the current AP */
1535         ifmgd->last_beacon_signal = rx_status->signal;
1536         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1537                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1538                 ifmgd->ave_beacon_signal = rx_status->signal;
1539                 ifmgd->last_cqm_event_signal = 0;
1540         } else {
1541                 ifmgd->ave_beacon_signal =
1542                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1543                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1544                          ifmgd->ave_beacon_signal) / 16;
1545         }
1546         if (bss_conf->cqm_rssi_thold &&
1547             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1548                 int sig = ifmgd->ave_beacon_signal / 16;
1549                 int last_event = ifmgd->last_cqm_event_signal;
1550                 int thold = bss_conf->cqm_rssi_thold;
1551                 int hyst = bss_conf->cqm_rssi_hyst;
1552                 if (sig < thold &&
1553                     (last_event == 0 || sig < last_event - hyst)) {
1554                         ifmgd->last_cqm_event_signal = sig;
1555                         ieee80211_cqm_rssi_notify(
1556                                 &sdata->vif,
1557                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1558                                 GFP_KERNEL);
1559                 } else if (sig > thold &&
1560                            (last_event == 0 || sig > last_event + hyst)) {
1561                         ifmgd->last_cqm_event_signal = sig;
1562                         ieee80211_cqm_rssi_notify(
1563                                 &sdata->vif,
1564                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1565                                 GFP_KERNEL);
1566                 }
1567         }
1568
1569         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1570 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1571                 if (net_ratelimit()) {
1572                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1573                                "to a received beacon\n", sdata->name);
1574                 }
1575 #endif
1576                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1577                 mutex_lock(&local->iflist_mtx);
1578                 ieee80211_recalc_ps(local, -1);
1579                 mutex_unlock(&local->iflist_mtx);
1580         }
1581
1582         /*
1583          * Push the beacon loss detection into the future since
1584          * we are processing a beacon from the AP just now.
1585          */
1586         mod_beacon_timer(sdata);
1587
1588         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1589         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1590                                           len - baselen, &elems,
1591                                           care_about_ies, ncrc);
1592
1593         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1594                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1595                                                    ifmgd->aid);
1596
1597         if (ncrc != ifmgd->beacon_crc) {
1598                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1599                                       true);
1600
1601                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1602                                          elems.wmm_param_len);
1603         }
1604
1605         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1606                 if (directed_tim) {
1607                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1608                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1609                                 ieee80211_hw_config(local,
1610                                                     IEEE80211_CONF_CHANGE_PS);
1611                                 ieee80211_send_nullfunc(local, sdata, 0);
1612                         } else {
1613                                 local->pspolling = true;
1614
1615                                 /*
1616                                  * Here is assumed that the driver will be
1617                                  * able to send ps-poll frame and receive a
1618                                  * response even though power save mode is
1619                                  * enabled, but some drivers might require
1620                                  * to disable power save here. This needs
1621                                  * to be investigated.
1622                                  */
1623                                 ieee80211_send_pspoll(local, sdata);
1624                         }
1625                 }
1626         }
1627
1628         if (ncrc == ifmgd->beacon_crc)
1629                 return;
1630         ifmgd->beacon_crc = ncrc;
1631
1632         if (elems.erp_info && elems.erp_info_len >= 1) {
1633                 erp_valid = true;
1634                 erp_value = elems.erp_info[0];
1635         } else {
1636                 erp_valid = false;
1637         }
1638         changed |= ieee80211_handle_bss_capability(sdata,
1639                         le16_to_cpu(mgmt->u.beacon.capab_info),
1640                         erp_valid, erp_value);
1641
1642
1643         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1644             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1645                 struct sta_info *sta;
1646                 struct ieee80211_supported_band *sband;
1647                 u16 ap_ht_cap_flags;
1648
1649                 rcu_read_lock();
1650
1651                 sta = sta_info_get(sdata, bssid);
1652                 if (WARN_ON(!sta)) {
1653                         rcu_read_unlock();
1654                         return;
1655                 }
1656
1657                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1658
1659                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1660                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1661
1662                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1663
1664                 rcu_read_unlock();
1665
1666                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1667                                                bssid, ap_ht_cap_flags);
1668         }
1669
1670         /* Note: country IE parsing is done for us by cfg80211 */
1671         if (elems.country_elem) {
1672                 /* TODO: IBSS also needs this */
1673                 if (elems.pwr_constr_elem)
1674                         ieee80211_handle_pwr_constr(sdata,
1675                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1676                                 elems.pwr_constr_elem,
1677                                 elems.pwr_constr_elem_len);
1678         }
1679
1680         ieee80211_bss_info_change_notify(sdata, changed);
1681 }
1682
1683 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1684                                   struct sk_buff *skb)
1685 {
1686         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1687         struct ieee80211_rx_status *rx_status;
1688         struct ieee80211_mgmt *mgmt;
1689         enum rx_mgmt_action rma = RX_MGMT_NONE;
1690         u16 fc;
1691
1692         rx_status = (struct ieee80211_rx_status *) skb->cb;
1693         mgmt = (struct ieee80211_mgmt *) skb->data;
1694         fc = le16_to_cpu(mgmt->frame_control);
1695
1696         mutex_lock(&ifmgd->mtx);
1697
1698         if (ifmgd->associated &&
1699             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1700                 switch (fc & IEEE80211_FCTL_STYPE) {
1701                 case IEEE80211_STYPE_BEACON:
1702                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1703                                                  rx_status);
1704                         break;
1705                 case IEEE80211_STYPE_PROBE_RESP:
1706                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1707                         break;
1708                 case IEEE80211_STYPE_DEAUTH:
1709                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1710                         break;
1711                 case IEEE80211_STYPE_DISASSOC:
1712                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1713                         break;
1714                 case IEEE80211_STYPE_ACTION:
1715                         switch (mgmt->u.action.category) {
1716                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1717                                 ieee80211_sta_process_chanswitch(sdata,
1718                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1719                                                 (void *)ifmgd->associated->priv,
1720                                                 rx_status->mactime);
1721                                 break;
1722                         }
1723                 }
1724                 mutex_unlock(&ifmgd->mtx);
1725
1726                 switch (rma) {
1727                 case RX_MGMT_NONE:
1728                         /* no action */
1729                         break;
1730                 case RX_MGMT_CFG80211_DEAUTH:
1731                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1732                         break;
1733                 case RX_MGMT_CFG80211_DISASSOC:
1734                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1735                         break;
1736                 default:
1737                         WARN(1, "unexpected: %d", rma);
1738                 }
1739                 return;
1740         }
1741
1742         mutex_unlock(&ifmgd->mtx);
1743
1744         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1745             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1746                 struct ieee80211_local *local = sdata->local;
1747                 struct ieee80211_work *wk;
1748
1749                 mutex_lock(&local->work_mtx);
1750                 list_for_each_entry(wk, &local->work_list, list) {
1751                         if (wk->sdata != sdata)
1752                                 continue;
1753
1754                         if (wk->type != IEEE80211_WORK_ASSOC)
1755                                 continue;
1756
1757                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1758                                 continue;
1759                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1760                                 continue;
1761
1762                         /*
1763                          * Printing the message only here means we can't
1764                          * spuriously print it, but it also means that it
1765                          * won't be printed when the frame comes in before
1766                          * we even tried to associate or in similar cases.
1767                          *
1768                          * Ultimately, I suspect cfg80211 should print the
1769                          * messages instead.
1770                          */
1771                         printk(KERN_DEBUG
1772                                "%s: deauthenticated from %pM (Reason: %u)\n",
1773                                sdata->name, mgmt->bssid,
1774                                le16_to_cpu(mgmt->u.deauth.reason_code));
1775
1776                         list_del_rcu(&wk->list);
1777                         free_work(wk);
1778                         break;
1779                 }
1780                 mutex_unlock(&local->work_mtx);
1781
1782                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1783         }
1784 }
1785
1786 static void ieee80211_sta_timer(unsigned long data)
1787 {
1788         struct ieee80211_sub_if_data *sdata =
1789                 (struct ieee80211_sub_if_data *) data;
1790         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1791         struct ieee80211_local *local = sdata->local;
1792
1793         if (local->quiescing) {
1794                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1795                 return;
1796         }
1797
1798         ieee80211_queue_work(&local->hw, &sdata->work);
1799 }
1800
1801 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
1802 {
1803         struct ieee80211_local *local = sdata->local;
1804         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1805
1806         /* then process the rest of the work */
1807         mutex_lock(&ifmgd->mtx);
1808
1809         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1810                             IEEE80211_STA_CONNECTION_POLL) &&
1811             ifmgd->associated) {
1812                 u8 bssid[ETH_ALEN];
1813
1814                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1815                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1816                         run_again(ifmgd, ifmgd->probe_timeout);
1817
1818                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1819 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1820                         printk(KERN_DEBUG "No probe response from AP %pM"
1821                                 " after %dms, try %d\n", bssid,
1822                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1823                                 ifmgd->probe_send_count);
1824 #endif
1825                         ieee80211_mgd_probe_ap_send(sdata);
1826                 } else {
1827                         /*
1828                          * We actually lost the connection ... or did we?
1829                          * Let's make sure!
1830                          */
1831                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1832                                           IEEE80211_STA_BEACON_POLL);
1833                         printk(KERN_DEBUG "No probe response from AP %pM"
1834                                 " after %dms, disconnecting.\n",
1835                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1836                         ieee80211_set_disassoc(sdata, true);
1837                         ieee80211_recalc_idle(local);
1838                         mutex_unlock(&ifmgd->mtx);
1839                         /*
1840                          * must be outside lock due to cfg80211,
1841                          * but that's not a problem.
1842                          */
1843                         ieee80211_send_deauth_disassoc(sdata, bssid,
1844                                         IEEE80211_STYPE_DEAUTH,
1845                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1846                                         NULL, true);
1847                         mutex_lock(&ifmgd->mtx);
1848                 }
1849         }
1850
1851         mutex_unlock(&ifmgd->mtx);
1852 }
1853
1854 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1855 {
1856         struct ieee80211_sub_if_data *sdata =
1857                 (struct ieee80211_sub_if_data *) data;
1858         struct ieee80211_local *local = sdata->local;
1859
1860         if (local->quiescing)
1861                 return;
1862
1863         ieee80211_queue_work(&sdata->local->hw,
1864                              &sdata->u.mgd.beacon_connection_loss_work);
1865 }
1866
1867 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1868 {
1869         struct ieee80211_sub_if_data *sdata =
1870                 (struct ieee80211_sub_if_data *) data;
1871         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1872         struct ieee80211_local *local = sdata->local;
1873
1874         if (local->quiescing)
1875                 return;
1876
1877         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1878 }
1879
1880 static void ieee80211_sta_monitor_work(struct work_struct *work)
1881 {
1882         struct ieee80211_sub_if_data *sdata =
1883                 container_of(work, struct ieee80211_sub_if_data,
1884                              u.mgd.monitor_work);
1885
1886         ieee80211_mgd_probe_ap(sdata, false);
1887 }
1888
1889 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1890 {
1891         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1892                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1893                                         IEEE80211_STA_CONNECTION_POLL);
1894
1895                 /* let's probe the connection once */
1896                 ieee80211_queue_work(&sdata->local->hw,
1897                            &sdata->u.mgd.monitor_work);
1898                 /* and do all the other regular work too */
1899                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1900         }
1901 }
1902
1903 #ifdef CONFIG_PM
1904 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1905 {
1906         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1907
1908         /*
1909          * we need to use atomic bitops for the running bits
1910          * only because both timers might fire at the same
1911          * time -- the code here is properly synchronised.
1912          */
1913
1914         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1915         if (del_timer_sync(&ifmgd->timer))
1916                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1917
1918         cancel_work_sync(&ifmgd->chswitch_work);
1919         if (del_timer_sync(&ifmgd->chswitch_timer))
1920                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1921
1922         cancel_work_sync(&ifmgd->monitor_work);
1923         /* these will just be re-established on connection */
1924         del_timer_sync(&ifmgd->conn_mon_timer);
1925         del_timer_sync(&ifmgd->bcn_mon_timer);
1926 }
1927
1928 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1929 {
1930         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1931
1932         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1933                 add_timer(&ifmgd->timer);
1934         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1935                 add_timer(&ifmgd->chswitch_timer);
1936 }
1937 #endif
1938
1939 /* interface setup */
1940 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1941 {
1942         struct ieee80211_if_managed *ifmgd;
1943
1944         ifmgd = &sdata->u.mgd;
1945         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1946         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1947         INIT_WORK(&ifmgd->beacon_connection_loss_work,
1948                   ieee80211_beacon_connection_loss_work);
1949         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1950                     (unsigned long) sdata);
1951         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1952                     (unsigned long) sdata);
1953         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1954                     (unsigned long) sdata);
1955         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1956                     (unsigned long) sdata);
1957
1958         ifmgd->flags = 0;
1959
1960         mutex_init(&ifmgd->mtx);
1961
1962         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1963                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1964         else
1965                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1966 }
1967
1968 /* scan finished notification */
1969 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1970 {
1971         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1972
1973         /* Restart STA timers */
1974         rcu_read_lock();
1975         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1976                 ieee80211_restart_sta_timer(sdata);
1977         rcu_read_unlock();
1978 }
1979
1980 int ieee80211_max_network_latency(struct notifier_block *nb,
1981                                   unsigned long data, void *dummy)
1982 {
1983         s32 latency_usec = (s32) data;
1984         struct ieee80211_local *local =
1985                 container_of(nb, struct ieee80211_local,
1986                              network_latency_notifier);
1987
1988         mutex_lock(&local->iflist_mtx);
1989         ieee80211_recalc_ps(local, latency_usec);
1990         mutex_unlock(&local->iflist_mtx);
1991
1992         return 0;
1993 }
1994
1995 /* config hooks */
1996 static enum work_done_result
1997 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1998                           struct sk_buff *skb)
1999 {
2000         if (!skb) {
2001                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2002                 return WORK_DONE_DESTROY;
2003         }
2004
2005         if (wk->type == IEEE80211_WORK_AUTH) {
2006                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2007                 return WORK_DONE_DESTROY;
2008         }
2009
2010         mutex_lock(&wk->sdata->u.mgd.mtx);
2011         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2012         mutex_unlock(&wk->sdata->u.mgd.mtx);
2013
2014         wk->type = IEEE80211_WORK_AUTH;
2015         wk->probe_auth.tries = 0;
2016         return WORK_DONE_REQUEUE;
2017 }
2018
2019 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2020                        struct cfg80211_auth_request *req)
2021 {
2022         const u8 *ssid;
2023         struct ieee80211_work *wk;
2024         u16 auth_alg;
2025
2026         if (req->local_state_change)
2027                 return 0; /* no need to update mac80211 state */
2028
2029         switch (req->auth_type) {
2030         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2031                 auth_alg = WLAN_AUTH_OPEN;
2032                 break;
2033         case NL80211_AUTHTYPE_SHARED_KEY:
2034                 if (IS_ERR(sdata->local->wep_tx_tfm))
2035                         return -EOPNOTSUPP;
2036                 auth_alg = WLAN_AUTH_SHARED_KEY;
2037                 break;
2038         case NL80211_AUTHTYPE_FT:
2039                 auth_alg = WLAN_AUTH_FT;
2040                 break;
2041         case NL80211_AUTHTYPE_NETWORK_EAP:
2042                 auth_alg = WLAN_AUTH_LEAP;
2043                 break;
2044         default:
2045                 return -EOPNOTSUPP;
2046         }
2047
2048         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2049         if (!wk)
2050                 return -ENOMEM;
2051
2052         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2053
2054         if (req->ie && req->ie_len) {
2055                 memcpy(wk->ie, req->ie, req->ie_len);
2056                 wk->ie_len = req->ie_len;
2057         }
2058
2059         if (req->key && req->key_len) {
2060                 wk->probe_auth.key_len = req->key_len;
2061                 wk->probe_auth.key_idx = req->key_idx;
2062                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2063         }
2064
2065         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2066         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2067         wk->probe_auth.ssid_len = ssid[1];
2068
2069         wk->probe_auth.algorithm = auth_alg;
2070         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2071
2072         /* if we already have a probe, don't probe again */
2073         if (req->bss->proberesp_ies)
2074                 wk->type = IEEE80211_WORK_AUTH;
2075         else
2076                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2077         wk->chan = req->bss->channel;
2078         wk->sdata = sdata;
2079         wk->done = ieee80211_probe_auth_done;
2080
2081         ieee80211_add_work(wk);
2082         return 0;
2083 }
2084
2085 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2086                                                   struct sk_buff *skb)
2087 {
2088         struct ieee80211_mgmt *mgmt;
2089         u16 status;
2090
2091         if (!skb) {
2092                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2093                 return WORK_DONE_DESTROY;
2094         }
2095
2096         mgmt = (void *)skb->data;
2097         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2098
2099         if (status == WLAN_STATUS_SUCCESS) {
2100                 mutex_lock(&wk->sdata->u.mgd.mtx);
2101                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2102                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2103                         /* oops -- internal error -- send timeout for now */
2104                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2105                                                     wk->filter_ta);
2106                         return WORK_DONE_DESTROY;
2107                 }
2108
2109                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2110         }
2111
2112         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2113         return WORK_DONE_DESTROY;
2114 }
2115
2116 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2117                         struct cfg80211_assoc_request *req)
2118 {
2119         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2120         struct ieee80211_bss *bss = (void *)req->bss->priv;
2121         struct ieee80211_work *wk;
2122         const u8 *ssid;
2123         int i;
2124
2125         mutex_lock(&ifmgd->mtx);
2126         if (ifmgd->associated) {
2127                 if (!req->prev_bssid ||
2128                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2129                            ETH_ALEN)) {
2130                         /*
2131                          * We are already associated and the request was not a
2132                          * reassociation request from the current BSS, so
2133                          * reject it.
2134                          */
2135                         mutex_unlock(&ifmgd->mtx);
2136                         return -EALREADY;
2137                 }
2138
2139                 /* Trying to reassociate - clear previous association state */
2140                 ieee80211_set_disassoc(sdata, true);
2141         }
2142         mutex_unlock(&ifmgd->mtx);
2143
2144         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2145         if (!wk)
2146                 return -ENOMEM;
2147
2148         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2149         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2150
2151         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2152                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2153                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2154                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2155                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2156
2157
2158         if (req->ie && req->ie_len) {
2159                 memcpy(wk->ie, req->ie, req->ie_len);
2160                 wk->ie_len = req->ie_len;
2161         } else
2162                 wk->ie_len = 0;
2163
2164         wk->assoc.bss = req->bss;
2165
2166         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2167
2168         /* new association always uses requested smps mode */
2169         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2170                 if (ifmgd->powersave)
2171                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2172                 else
2173                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2174         } else
2175                 ifmgd->ap_smps = ifmgd->req_smps;
2176
2177         wk->assoc.smps = ifmgd->ap_smps;
2178         /*
2179          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2180          * We still associate in non-HT mode (11a/b/g) if any one of these
2181          * ciphers is configured as pairwise.
2182          * We can set this to true for non-11n hardware, that'll be checked
2183          * separately along with the peer capabilities.
2184          */
2185         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2186         wk->assoc.capability = req->bss->capability;
2187         wk->assoc.wmm_used = bss->wmm_used;
2188         wk->assoc.supp_rates = bss->supp_rates;
2189         wk->assoc.supp_rates_len = bss->supp_rates_len;
2190         wk->assoc.ht_information_ie =
2191                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2192
2193         if (bss->wmm_used && bss->uapsd_supported &&
2194             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2195                 wk->assoc.uapsd_used = true;
2196                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2197         } else {
2198                 wk->assoc.uapsd_used = false;
2199                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2200         }
2201
2202         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2203         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2204         wk->assoc.ssid_len = ssid[1];
2205
2206         if (req->prev_bssid)
2207                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2208
2209         wk->type = IEEE80211_WORK_ASSOC;
2210         wk->chan = req->bss->channel;
2211         wk->sdata = sdata;
2212         wk->done = ieee80211_assoc_done;
2213
2214         if (req->use_mfp) {
2215                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2216                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2217         } else {
2218                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2219                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2220         }
2221
2222         if (req->crypto.control_port)
2223                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2224         else
2225                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2226
2227         ieee80211_add_work(wk);
2228         return 0;
2229 }
2230
2231 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2232                          struct cfg80211_deauth_request *req,
2233                          void *cookie)
2234 {
2235         struct ieee80211_local *local = sdata->local;
2236         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2237         struct ieee80211_work *wk;
2238         u8 bssid[ETH_ALEN];
2239         bool assoc_bss = false;
2240
2241         mutex_lock(&ifmgd->mtx);
2242
2243         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2244         if (ifmgd->associated == req->bss) {
2245                 ieee80211_set_disassoc(sdata, false);
2246                 mutex_unlock(&ifmgd->mtx);
2247                 assoc_bss = true;
2248         } else {
2249                 bool not_auth_yet = false;
2250
2251                 mutex_unlock(&ifmgd->mtx);
2252
2253                 mutex_lock(&local->work_mtx);
2254                 list_for_each_entry(wk, &local->work_list, list) {
2255                         if (wk->sdata != sdata)
2256                                 continue;
2257
2258                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2259                             wk->type != IEEE80211_WORK_AUTH &&
2260                             wk->type != IEEE80211_WORK_ASSOC)
2261                                 continue;
2262
2263                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2264                                 continue;
2265
2266                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2267                         list_del_rcu(&wk->list);
2268                         free_work(wk);
2269                         break;
2270                 }
2271                 mutex_unlock(&local->work_mtx);
2272
2273                 /*
2274                  * If somebody requests authentication and we haven't
2275                  * sent out an auth frame yet there's no need to send
2276                  * out a deauth frame either. If the state was PROBE,
2277                  * then this is the case. If it's AUTH we have sent a
2278                  * frame, and if it's IDLE we have completed the auth
2279                  * process already.
2280                  */
2281                 if (not_auth_yet) {
2282                         __cfg80211_auth_canceled(sdata->dev, bssid);
2283                         return 0;
2284                 }
2285         }
2286
2287         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2288                sdata->name, bssid, req->reason_code);
2289
2290         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2291                                        req->reason_code, cookie,
2292                                        !req->local_state_change);
2293         if (assoc_bss)
2294                 sta_info_destroy_addr(sdata, bssid);
2295
2296         ieee80211_recalc_idle(sdata->local);
2297
2298         return 0;
2299 }
2300
2301 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2302                            struct cfg80211_disassoc_request *req,
2303                            void *cookie)
2304 {
2305         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2306         u8 bssid[ETH_ALEN];
2307
2308         mutex_lock(&ifmgd->mtx);
2309
2310         /*
2311          * cfg80211 should catch this ... but it's racy since
2312          * we can receive a disassoc frame, process it, hand it
2313          * to cfg80211 while that's in a locked section already
2314          * trying to tell us that the user wants to disconnect.
2315          */
2316         if (ifmgd->associated != req->bss) {
2317                 mutex_unlock(&ifmgd->mtx);
2318                 return -ENOLINK;
2319         }
2320
2321         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2322                sdata->name, req->bss->bssid, req->reason_code);
2323
2324         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2325         ieee80211_set_disassoc(sdata, false);
2326
2327         mutex_unlock(&ifmgd->mtx);
2328
2329         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2330                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2331                         cookie, !req->local_state_change);
2332         sta_info_destroy_addr(sdata, bssid);
2333
2334         ieee80211_recalc_idle(sdata->local);
2335
2336         return 0;
2337 }
2338
2339 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2340                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2341                                gfp_t gfp)
2342 {
2343         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2344
2345         trace_api_cqm_rssi_notify(sdata, rssi_event);
2346
2347         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2348 }
2349 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);