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