net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/pm_qos_params.h>
  21 #include <linux/crc32.h>
  22 #include <linux/slab.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "driver-ops.h"
  28 #include "rate.h"
  29 #include "led.h"
  30
  31 #define IEEE80211_MAX_NULLFUNC_TRIES 2
  32 #define IEEE80211_MAX_PROBE_TRIES 5
  33
  34 /*
  35  * Beacon loss timeout is calculated as N frames times the
  36  * advertised beacon interval.  This may need to be somewhat
  37  * higher than what hardware might detect to account for
  38  * delays in the host processing frames. But since we also
  39  * probe on beacon miss before declaring the connection lost
  40  * default to what we want.
  41  */
  42 #define IEEE80211_BEACON_LOSS_COUNT     7
  43
  44 /*
  45  * Time the connection can be idle before we probe
  46  * it to see if we can still talk to the AP.
  47  */
  48 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  49 /*
  50  * Time we wait for a probe response after sending
  51  * a probe request because of beacon loss or for
  52  * checking the connection still works.
  53  */
  54 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  55
  56 /*
  57  * Weight given to the latest Beacon frame when calculating average signal
  58  * strength for Beacon frames received in the current BSS. This must be
  59  * between 1 and 15.
  60  */
  61 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  62
  63 /*
  64  * How many Beacon frames need to have been used in average signal strength
  65  * before starting to indicate signal change events.
  66  */
  67 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  68
  69 #define TMR_RUNNING_TIMER       0
  70 #define TMR_RUNNING_CHANSW      1
  71
  72 /*
  73  * All cfg80211 functions have to be called outside a locked
  74  * section so that they can acquire a lock themselves... This
  75  * is much simpler than queuing up things in cfg80211, but we
  76  * do need some indirection for that here.
  77  */
  78 enum rx_mgmt_action {
  79         /* no action required */
  80         RX_MGMT_NONE,
  81
  82         /* caller must call cfg80211_send_rx_auth() */
  83         RX_MGMT_CFG80211_AUTH,
  84
  85         /* caller must call cfg80211_send_rx_assoc() */
  86         RX_MGMT_CFG80211_ASSOC,
  87
  88         /* caller must call cfg80211_send_deauth() */
  89         RX_MGMT_CFG80211_DEAUTH,
  90
  91         /* caller must call cfg80211_send_disassoc() */
  92         RX_MGMT_CFG80211_DISASSOC,
  93
  94         /* caller must tell cfg80211 about internal error */
  95         RX_MGMT_CFG80211_ASSOC_ERROR,
  96 };
  97
  98 /* utils */
  99 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 100 {
 101         lockdep_assert_held(&ifmgd->mtx);
 102 }
 103
 104 /*
 105  * We can have multiple work items (and connection probing)
 106  * scheduling this timer, but we need to take care to only
 107  * reschedule it when it should fire _earlier_ than it was
 108  * asked for before, or if it's not pending right now. This
 109  * function ensures that. Note that it then is required to
 110  * run this function for all timeouts after the first one
 111  * has happened -- the work that runs from this timer will
 112  * do that.
 113  */
 114 static void run_again(struct ieee80211_if_managed *ifmgd,
 115                              unsigned long timeout)
 116 {
 117         ASSERT_MGD_MTX(ifmgd);
 118
 119         if (!timer_pending(&ifmgd->timer) ||
 120             time_before(timeout, ifmgd->timer.expires))
 121                 mod_timer(&ifmgd->timer, timeout);
 122 }
 123
 124 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 125 {
 126         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 127                 return;
 128
 129         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 130                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 131 }
 132
 133 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 134 {
 135         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 136
 137         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 138                 return;
 139
 140         mod_timer(&sdata->u.mgd.conn_mon_timer,
 141                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 142
 143         ifmgd->probe_send_count = 0;
 144 }
 145
 146 static int ecw2cw(int ecw)
 147 {
 148         return (1 << ecw) - 1;
 149 }
 150
 151 /*
 152  * ieee80211_enable_ht should be called only after the operating band
 153  * has been determined as ht configuration depends on the hw's
 154  * HT abilities for a specific band.
 155  */
 156 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 157                                struct ieee80211_ht_info *hti,
 158                                const u8 *bssid, u16 ap_ht_cap_flags)
 159 {
 160         struct ieee80211_local *local = sdata->local;
 161         struct ieee80211_supported_band *sband;
 162         struct sta_info *sta;
 163         u32 changed = 0;
 164         u16 ht_opmode;
 165         bool enable_ht = true;
 166         enum nl80211_channel_type prev_chantype;
 167         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 168
 169         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 170
 171         prev_chantype = sdata->vif.bss_conf.channel_type;
 172
 173         /* HT is not supported */
 174         if (!sband->ht_cap.ht_supported)
 175                 enable_ht = false;
 176
 177         /* check that channel matches the right operating channel */
 178         if (local->hw.conf.channel->center_freq !=
 179             ieee80211_channel_to_frequency(hti->control_chan))
 180                 enable_ht = false;
 181
 182         if (enable_ht) {
 183                 channel_type = NL80211_CHAN_HT20;
 184
 185                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 186                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 187                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 188                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 189                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 190                                 if (!(local->hw.conf.channel->flags &
 191                                     IEEE80211_CHAN_NO_HT40PLUS))
 192                                         channel_type = NL80211_CHAN_HT40PLUS;
 193                                 break;
 194                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 195                                 if (!(local->hw.conf.channel->flags &
 196                                     IEEE80211_CHAN_NO_HT40MINUS))
 197                                         channel_type = NL80211_CHAN_HT40MINUS;
 198                                 break;
 199                         }
 200                 }
 201         }
 202
 203         if (local->tmp_channel)
 204                 local->tmp_channel_type = channel_type;
 205
 206         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 207                 /* can only fail due to HT40+/- mismatch */
 208                 channel_type = NL80211_CHAN_HT20;
 209                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 210         }
 211
 212         /* channel_type change automatically detected */
 213         ieee80211_hw_config(local, 0);
 214
 215         if (prev_chantype != channel_type) {
 216                 rcu_read_lock();
 217                 sta = sta_info_get(sdata, bssid);
 218                 if (sta)
 219                         rate_control_rate_update(local, sband, sta,
 220                                                  IEEE80211_RC_HT_CHANGED,
 221                                                  channel_type);
 222                 rcu_read_unlock();
 223         }
 224
 225         ht_opmode = le16_to_cpu(hti->operation_mode);
 226
 227         /* if bss configuration changed store the new one */
 228         if (sdata->ht_opmode_valid != enable_ht ||
 229             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 230             prev_chantype != channel_type) {
 231                 changed |= BSS_CHANGED_HT;
 232                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 233                 sdata->ht_opmode_valid = enable_ht;
 234         }
 235
 236         return changed;
 237 }
 238
 239 /* frame sending functions */
 240
 241 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 242                                            const u8 *bssid, u16 stype, u16 reason,
 243                                            void *cookie, bool send_frame)
 244 {
 245         struct ieee80211_local *local = sdata->local;
 246         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 247         struct sk_buff *skb;
 248         struct ieee80211_mgmt *mgmt;
 249
 250         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 251         if (!skb) {
 252                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 253                        "deauth/disassoc frame\n", sdata->name);
 254                 return;
 255         }
 256         skb_reserve(skb, local->hw.extra_tx_headroom);
 257
 258         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 259         memset(mgmt, 0, 24);
 260         memcpy(mgmt->da, bssid, ETH_ALEN);
 261         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 262         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 263         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 264         skb_put(skb, 2);
 265         /* u.deauth.reason_code == u.disassoc.reason_code */
 266         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 267
 268         if (stype == IEEE80211_STYPE_DEAUTH)
 269                 if (cookie)
 270                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 271                 else
 272                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 273         else
 274                 if (cookie)
 275                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 276                 else
 277                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 278         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 279                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 280
 281         if (send_frame)
 282                 ieee80211_tx_skb(sdata, skb);
 283         else
 284                 kfree_skb(skb);
 285 }
 286
 287 void ieee80211_send_pspoll(struct ieee80211_local *local,
 288                            struct ieee80211_sub_if_data *sdata)
 289 {
 290         struct ieee80211_pspoll *pspoll;
 291         struct sk_buff *skb;
 292
 293         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 294         if (!skb)
 295                 return;
 296
 297         pspoll = (struct ieee80211_pspoll *) skb->data;
 298         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 299
 300         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 301         ieee80211_tx_skb(sdata, skb);
 302 }
 303
 304 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 305                              struct ieee80211_sub_if_data *sdata,
 306                              int powersave)
 307 {
 308         struct sk_buff *skb;
 309         struct ieee80211_hdr_3addr *nullfunc;
 310
 311         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 312         if (!skb)
 313                 return;
 314
 315         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 316         if (powersave)
 317                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 318
 319         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 320         ieee80211_tx_skb(sdata, skb);
 321 }
 322
 323 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 324                                           struct ieee80211_sub_if_data *sdata)
 325 {
 326         struct sk_buff *skb;
 327         struct ieee80211_hdr *nullfunc;
 328         __le16 fc;
 329
 330         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 331                 return;
 332
 333         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 334         if (!skb) {
 335                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 336                        "nullfunc frame\n", sdata->name);
 337                 return;
 338         }
 339         skb_reserve(skb, local->hw.extra_tx_headroom);
 340
 341         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 342         memset(nullfunc, 0, 30);
 343         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 344                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 345         nullfunc->frame_control = fc;
 346         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 347         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 348         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 349         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 350
 351         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 352         ieee80211_tx_skb(sdata, skb);
 353 }
 354
 355 /* spectrum management related things */
 356 static void ieee80211_chswitch_work(struct work_struct *work)
 357 {
 358         struct ieee80211_sub_if_data *sdata =
 359                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 360         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 361
 362         if (!ieee80211_sdata_running(sdata))
 363                 return;
 364
 365         mutex_lock(&ifmgd->mtx);
 366         if (!ifmgd->associated)
 367                 goto out;
 368
 369         sdata->local->oper_channel = sdata->local->csa_channel;
 370         if (!sdata->local->ops->channel_switch) {
 371                 /* call "hw_config" only if doing sw channel switch */
 372                 ieee80211_hw_config(sdata->local,
 373                         IEEE80211_CONF_CHANGE_CHANNEL);
 374         }
 375
 376         /* XXX: shouldn't really modify cfg80211-owned data! */
 377         ifmgd->associated->channel = sdata->local->oper_channel;
 378
 379         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 380                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 381  out:
 382         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 383         mutex_unlock(&ifmgd->mtx);
 384 }
 385
 386 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 387 {
 388         struct ieee80211_sub_if_data *sdata;
 389         struct ieee80211_if_managed *ifmgd;
 390
 391         sdata = vif_to_sdata(vif);
 392         ifmgd = &sdata->u.mgd;
 393
 394         trace_api_chswitch_done(sdata, success);
 395         if (!success) {
 396                 /*
 397                  * If the channel switch was not successful, stay
 398                  * around on the old channel. We currently lack
 399                  * good handling of this situation, possibly we
 400                  * should just drop the association.
 401                  */
 402                 sdata->local->csa_channel = sdata->local->oper_channel;
 403         }
 404
 405         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 406 }
 407 EXPORT_SYMBOL(ieee80211_chswitch_done);
 408
 409 static void ieee80211_chswitch_timer(unsigned long data)
 410 {
 411         struct ieee80211_sub_if_data *sdata =
 412                 (struct ieee80211_sub_if_data *) data;
 413         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 414
 415         if (sdata->local->quiescing) {
 416                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 417                 return;
 418         }
 419
 420         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 421 }
 422
 423 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 424                                       struct ieee80211_channel_sw_ie *sw_elem,
 425                                       struct ieee80211_bss *bss,
 426                                       u64 timestamp)
 427 {
 428         struct cfg80211_bss *cbss =
 429                 container_of((void *)bss, struct cfg80211_bss, priv);
 430         struct ieee80211_channel *new_ch;
 431         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 432         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 433
 434         ASSERT_MGD_MTX(ifmgd);
 435
 436         if (!ifmgd->associated)
 437                 return;
 438
 439         if (sdata->local->scanning)
 440                 return;
 441
 442         /* Disregard subsequent beacons if we are already running a timer
 443            processing a CSA */
 444
 445         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 446                 return;
 447
 448         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 449         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 450                 return;
 451
 452         sdata->local->csa_channel = new_ch;
 453
 454         if (sdata->local->ops->channel_switch) {
 455                 /* use driver's channel switch callback */
 456                 struct ieee80211_channel_switch ch_switch;
 457                 memset(&ch_switch, 0, sizeof(ch_switch));
 458                 ch_switch.timestamp = timestamp;
 459                 if (sw_elem->mode) {
 460                         ch_switch.block_tx = true;
 461                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 462                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 463                 }
 464                 ch_switch.channel = new_ch;
 465                 ch_switch.count = sw_elem->count;
 466                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 467                 drv_channel_switch(sdata->local, &ch_switch);
 468                 return;
 469         }
 470
 471         /* channel switch handled in software */
 472         if (sw_elem->count <= 1) {
 473                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 474         } else {
 475                 if (sw_elem->mode)
 476                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 477                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 478                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 479                 mod_timer(&ifmgd->chswitch_timer,
 480                           jiffies +
 481                           msecs_to_jiffies(sw_elem->count *
 482                                            cbss->beacon_interval));
 483         }
 484 }
 485
 486 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 487                                         u16 capab_info, u8 *pwr_constr_elem,
 488                                         u8 pwr_constr_elem_len)
 489 {
 490         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 491
 492         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 493                 return;
 494
 495         /* Power constraint IE length should be 1 octet */
 496         if (pwr_constr_elem_len != 1)
 497                 return;
 498
 499         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 500             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 501                 sdata->local->power_constr_level = *pwr_constr_elem;
 502                 ieee80211_hw_config(sdata->local, 0);
 503         }
 504 }
 505
 506 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 507 {
 508         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 509         struct ieee80211_local *local = sdata->local;
 510         struct ieee80211_conf *conf = &local->hw.conf;
 511
 512         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 513                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 514                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 515
 516         local->disable_dynamic_ps = false;
 517         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 518 }
 519 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 520
 521 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 522 {
 523         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 524         struct ieee80211_local *local = sdata->local;
 525         struct ieee80211_conf *conf = &local->hw.conf;
 526
 527         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 528                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 529                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 530
 531         local->disable_dynamic_ps = true;
 532         conf->dynamic_ps_timeout = 0;
 533         del_timer_sync(&local->dynamic_ps_timer);
 534         ieee80211_queue_work(&local->hw,
 535                              &local->dynamic_ps_enable_work);
 536 }
 537 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 538
 539 /* powersave */
 540 static void ieee80211_enable_ps(struct ieee80211_local *local,
 541                                 struct ieee80211_sub_if_data *sdata)
 542 {
 543         struct ieee80211_conf *conf = &local->hw.conf;
 544
 545         /*
 546          * If we are scanning right now then the parameters will
 547          * take effect when scan finishes.
 548          */
 549         if (local->scanning)
 550                 return;
 551
 552         if (conf->dynamic_ps_timeout > 0 &&
 553             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 554                 mod_timer(&local->dynamic_ps_timer, jiffies +
 555                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 556         } else {
 557                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 558                         ieee80211_send_nullfunc(local, sdata, 1);
 559
 560                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 561                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 562                         return;
 563
 564                 conf->flags |= IEEE80211_CONF_PS;
 565                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 566         }
 567 }
 568
 569 static void ieee80211_change_ps(struct ieee80211_local *local)
 570 {
 571         struct ieee80211_conf *conf = &local->hw.conf;
 572
 573         if (local->ps_sdata) {
 574                 ieee80211_enable_ps(local, local->ps_sdata);
 575         } else if (conf->flags & IEEE80211_CONF_PS) {
 576                 conf->flags &= ~IEEE80211_CONF_PS;
 577                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 578                 del_timer_sync(&local->dynamic_ps_timer);
 579                 cancel_work_sync(&local->dynamic_ps_enable_work);
 580         }
 581 }
 582
 583 /* need to hold RTNL or interface lock */
 584 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 585 {
 586         struct ieee80211_sub_if_data *sdata, *found = NULL;
 587         int count = 0;
 588         int timeout;
 589
 590         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 591                 local->ps_sdata = NULL;
 592                 return;
 593         }
 594
 595         if (!list_empty(&local->work_list)) {
 596                 local->ps_sdata = NULL;
 597                 goto change;
 598         }
 599
 600         list_for_each_entry(sdata, &local->interfaces, list) {
 601                 if (!ieee80211_sdata_running(sdata))
 602                         continue;
 603                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 604                         continue;
 605                 found = sdata;
 606                 count++;
 607         }
 608
 609         if (count == 1 && found->u.mgd.powersave &&
 610             found->u.mgd.associated &&
 611             found->u.mgd.associated->beacon_ies &&
 612             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 613                                     IEEE80211_STA_CONNECTION_POLL))) {
 614                 struct ieee80211_conf *conf = &local->hw.conf;
 615                 s32 beaconint_us;
 616
 617                 if (latency < 0)
 618                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 619
 620                 beaconint_us = ieee80211_tu_to_usec(
 621                                         found->vif.bss_conf.beacon_int);
 622
 623                 timeout = local->dynamic_ps_forced_timeout;
 624                 if (timeout < 0) {
 625                         /*
 626                          * Go to full PSM if the user configures a very low
 627                          * latency requirement.
 628                          * The 2000 second value is there for compatibility
 629                          * until the PM_QOS_NETWORK_LATENCY is configured
 630                          * with real values.
 631                          */
 632                         if (latency > (1900 * USEC_PER_MSEC) &&
 633                             latency != (2000 * USEC_PER_SEC))
 634                                 timeout = 0;
 635                         else
 636                                 timeout = 100;
 637                 }
 638                 local->dynamic_ps_user_timeout = timeout;
 639                 if (!local->disable_dynamic_ps)
 640                         conf->dynamic_ps_timeout =
 641                                 local->dynamic_ps_user_timeout;
 642
 643                 if (beaconint_us > latency) {
 644                         local->ps_sdata = NULL;
 645                 } else {
 646                         struct ieee80211_bss *bss;
 647                         int maxslp = 1;
 648                         u8 dtimper;
 649
 650                         bss = (void *)found->u.mgd.associated->priv;
 651                         dtimper = bss->dtim_period;
 652
 653                         /* If the TIM IE is invalid, pretend the value is 1 */
 654                         if (!dtimper)
 655                                 dtimper = 1;
 656                         else if (dtimper > 1)
 657                                 maxslp = min_t(int, dtimper,
 658                                                     latency / beaconint_us);
 659
 660                         local->hw.conf.max_sleep_period = maxslp;
 661                         local->hw.conf.ps_dtim_period = dtimper;
 662                         local->ps_sdata = found;
 663                 }
 664         } else {
 665                 local->ps_sdata = NULL;
 666         }
 667
 668  change:
 669         ieee80211_change_ps(local);
 670 }
 671
 672 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 673 {
 674         struct ieee80211_local *local =
 675                 container_of(work, struct ieee80211_local,
 676                              dynamic_ps_disable_work);
 677
 678         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 679                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 680                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 681         }
 682
 683         ieee80211_wake_queues_by_reason(&local->hw,
 684                                         IEEE80211_QUEUE_STOP_REASON_PS);
 685 }
 686
 687 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 688 {
 689         struct ieee80211_local *local =
 690                 container_of(work, struct ieee80211_local,
 691                              dynamic_ps_enable_work);
 692         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 693         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 694
 695         /* can only happen when PS was just disabled anyway */
 696         if (!sdata)
 697                 return;
 698
 699         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 700                 return;
 701
 702         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 703             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 704                 ieee80211_send_nullfunc(local, sdata, 1);
 705
 706         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 707               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 708             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 709                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 710                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 711                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 712         }
 713 }
 714
 715 void ieee80211_dynamic_ps_timer(unsigned long data)
 716 {
 717         struct ieee80211_local *local = (void *) data;
 718
 719         if (local->quiescing || local->suspended)
 720                 return;
 721
 722         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 723 }
 724
 725 /* MLME */
 726 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 727                                      struct ieee80211_sub_if_data *sdata,
 728                                      u8 *wmm_param, size_t wmm_param_len)
 729 {
 730         struct ieee80211_tx_queue_params params;
 731         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 732         size_t left;
 733         int count;
 734         u8 *pos, uapsd_queues = 0;
 735
 736         if (!local->ops->conf_tx)
 737                 return;
 738
 739         if (local->hw.queues < 4)
 740                 return;
 741
 742         if (!wmm_param)
 743                 return;
 744
 745         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 746                 return;
 747
 748         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 749                 uapsd_queues = local->uapsd_queues;
 750
 751         count = wmm_param[6] & 0x0f;
 752         if (count == ifmgd->wmm_last_param_set)
 753                 return;
 754         ifmgd->wmm_last_param_set = count;
 755
 756         pos = wmm_param + 8;
 757         left = wmm_param_len - 8;
 758
 759         memset(&params, 0, sizeof(params));
 760
 761         local->wmm_acm = 0;
 762         for (; left >= 4; left -= 4, pos += 4) {
 763                 int aci = (pos[0] >> 5) & 0x03;
 764                 int acm = (pos[0] >> 4) & 0x01;
 765                 bool uapsd = false;
 766                 int queue;
 767
 768                 switch (aci) {
 769                 case 1: /* AC_BK */
 770                         queue = 3;
 771                         if (acm)
 772                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 773                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 774                                 uapsd = true;
 775                         break;
 776                 case 2: /* AC_VI */
 777                         queue = 1;
 778                         if (acm)
 779                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 780                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 781                                 uapsd = true;
 782                         break;
 783                 case 3: /* AC_VO */
 784                         queue = 0;
 785                         if (acm)
 786                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 787                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 788                                 uapsd = true;
 789                         break;
 790                 case 0: /* AC_BE */
 791                 default:
 792                         queue = 2;
 793                         if (acm)
 794                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 795                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 796                                 uapsd = true;
 797                         break;
 798                 }
 799
 800                 params.aifs = pos[0] & 0x0f;
 801                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 802                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 803                 params.txop = get_unaligned_le16(pos + 2);
 804                 params.uapsd = uapsd;
 805
 806 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 807                 wiphy_debug(local->hw.wiphy,
 808                             "WMM queue=%d aci=%d acm=%d aifs=%d "
 809                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 810                             queue, aci, acm,
 811                             params.aifs, params.cw_min, params.cw_max,
 812                             params.txop, params.uapsd);
 813 #endif
 814                 if (drv_conf_tx(local, queue, &params))
 815                         wiphy_debug(local->hw.wiphy,
 816                                     "failed to set TX queue parameters for queue %d\n",
 817                                     queue);
 818         }
 819
 820         /* enable WMM or activate new settings */
 821         sdata->vif.bss_conf.qos = true;
 822         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 823 }
 824
 825 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 826                                            u16 capab, bool erp_valid, u8 erp)
 827 {
 828         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 829         u32 changed = 0;
 830         bool use_protection;
 831         bool use_short_preamble;
 832         bool use_short_slot;
 833
 834         if (erp_valid) {
 835                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 836                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 837         } else {
 838                 use_protection = false;
 839                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 840         }
 841
 842         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 843         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 844                 use_short_slot = true;
 845
 846         if (use_protection != bss_conf->use_cts_prot) {
 847                 bss_conf->use_cts_prot = use_protection;
 848                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 849         }
 850
 851         if (use_short_preamble != bss_conf->use_short_preamble) {
 852                 bss_conf->use_short_preamble = use_short_preamble;
 853                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 854         }
 855
 856         if (use_short_slot != bss_conf->use_short_slot) {
 857                 bss_conf->use_short_slot = use_short_slot;
 858                 changed |= BSS_CHANGED_ERP_SLOT;
 859         }
 860
 861         return changed;
 862 }
 863
 864 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 865                                      struct cfg80211_bss *cbss,
 866                                      u32 bss_info_changed)
 867 {
 868         struct ieee80211_bss *bss = (void *)cbss->priv;
 869         struct ieee80211_local *local = sdata->local;
 870         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 871
 872         bss_info_changed |= BSS_CHANGED_ASSOC;
 873         /* set timing information */
 874         bss_conf->beacon_int = cbss->beacon_interval;
 875         bss_conf->timestamp = cbss->tsf;
 876
 877         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 878         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 879                 cbss->capability, bss->has_erp_value, bss->erp_value);
 880
 881         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
 882                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
 883
 884         sdata->u.mgd.associated = cbss;
 885         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 886
 887         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 888
 889         /* just to be sure */
 890         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 891                                 IEEE80211_STA_BEACON_POLL);
 892
 893         ieee80211_led_assoc(local, 1);
 894
 895         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
 896                 bss_conf->dtim_period = bss->dtim_period;
 897         else
 898                 bss_conf->dtim_period = 0;
 899
 900         bss_conf->assoc = 1;
 901         /*
 902          * For now just always ask the driver to update the basic rateset
 903          * when we have associated, we aren't checking whether it actually
 904          * changed or not.
 905          */
 906         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 907
 908         /* And the BSSID changed - we're associated now */
 909         bss_info_changed |= BSS_CHANGED_BSSID;
 910
 911         /* Tell the driver to monitor connection quality (if supported) */
 912         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 913             bss_conf->cqm_rssi_thold)
 914                 bss_info_changed |= BSS_CHANGED_CQM;
 915
 916         /* Enable ARP filtering */
 917         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
 918                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 919                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
 920         }
 921
 922         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 923
 924         mutex_lock(&local->iflist_mtx);
 925         ieee80211_recalc_ps(local, -1);
 926         ieee80211_recalc_smps(local);
 927         mutex_unlock(&local->iflist_mtx);
 928
 929         netif_tx_start_all_queues(sdata->dev);
 930         netif_carrier_on(sdata->dev);
 931 }
 932
 933 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 934                                    bool remove_sta, bool tx)
 935 {
 936         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 937         struct ieee80211_local *local = sdata->local;
 938         struct sta_info *sta;
 939         u32 changed = 0, config_changed = 0;
 940         u8 bssid[ETH_ALEN];
 941
 942         ASSERT_MGD_MTX(ifmgd);
 943
 944         if (WARN_ON(!ifmgd->associated))
 945                 return;
 946
 947         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 948
 949         ifmgd->associated = NULL;
 950         memset(ifmgd->bssid, 0, ETH_ALEN);
 951
 952         /*
 953          * we need to commit the associated = NULL change because the
 954          * scan code uses that to determine whether this iface should
 955          * go to/wake up from powersave or not -- and could otherwise
 956          * wake the queues erroneously.
 957          */
 958         smp_mb();
 959
 960         /*
 961          * Thus, we can only afterwards stop the queues -- to account
 962          * for the case where another CPU is finishing a scan at this
 963          * time -- we don't want the scan code to enable queues.
 964          */
 965
 966         netif_tx_stop_all_queues(sdata->dev);
 967         netif_carrier_off(sdata->dev);
 968
 969         mutex_lock(&local->sta_mtx);
 970         sta = sta_info_get(sdata, bssid);
 971         if (sta) {
 972                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
 973                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
 974         }
 975         mutex_unlock(&local->sta_mtx);
 976
 977         changed |= ieee80211_reset_erp_info(sdata);
 978
 979         ieee80211_led_assoc(local, 0);
 980         changed |= BSS_CHANGED_ASSOC;
 981         sdata->vif.bss_conf.assoc = false;
 982
 983         ieee80211_set_wmm_default(sdata);
 984
 985         /* channel(_type) changes are handled by ieee80211_hw_config */
 986         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
 987
 988         /* on the next assoc, re-program HT parameters */
 989         sdata->ht_opmode_valid = false;
 990
 991         local->power_constr_level = 0;
 992
 993         del_timer_sync(&local->dynamic_ps_timer);
 994         cancel_work_sync(&local->dynamic_ps_enable_work);
 995
 996         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 997                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 998                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 999         }
1000
1001         ieee80211_hw_config(local, config_changed);
1002
1003         /* Disable ARP filtering */
1004         if (sdata->vif.bss_conf.arp_filter_enabled) {
1005                 sdata->vif.bss_conf.arp_filter_enabled = false;
1006                 changed |= BSS_CHANGED_ARP_FILTER;
1007         }
1008
1009         /* The BSSID (not really interesting) and HT changed */
1010         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1011         ieee80211_bss_info_change_notify(sdata, changed);
1012
1013         if (remove_sta)
1014                 sta_info_destroy_addr(sdata, bssid);
1015
1016         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1017         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1018         del_timer_sync(&sdata->u.mgd.timer);
1019         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1020 }
1021
1022 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1023                              struct ieee80211_hdr *hdr)
1024 {
1025         /*
1026          * We can postpone the mgd.timer whenever receiving unicast frames
1027          * from AP because we know that the connection is working both ways
1028          * at that time. But multicast frames (and hence also beacons) must
1029          * be ignored here, because we need to trigger the timer during
1030          * data idle periods for sending the periodic probe request to the
1031          * AP we're connected to.
1032          */
1033         if (is_multicast_ether_addr(hdr->addr1))
1034                 return;
1035
1036         /*
1037          * In case we receive frames after disassociation.
1038          */
1039         if (!sdata->u.mgd.associated)
1040                 return;
1041
1042         ieee80211_sta_reset_conn_monitor(sdata);
1043 }
1044
1045 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1046 {
1047         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1048
1049         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1050                               IEEE80211_STA_CONNECTION_POLL)))
1051             return;
1052
1053         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1054                           IEEE80211_STA_BEACON_POLL);
1055         mutex_lock(&sdata->local->iflist_mtx);
1056         ieee80211_recalc_ps(sdata->local, -1);
1057         mutex_unlock(&sdata->local->iflist_mtx);
1058
1059         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1060                 return;
1061
1062         /*
1063          * We've received a probe response, but are not sure whether
1064          * we have or will be receiving any beacons or data, so let's
1065          * schedule the timers again, just in case.
1066          */
1067         ieee80211_sta_reset_beacon_monitor(sdata);
1068
1069         mod_timer(&ifmgd->conn_mon_timer,
1070                   round_jiffies_up(jiffies +
1071                                    IEEE80211_CONNECTION_IDLE_TIME));
1072 }
1073
1074 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1075                              struct ieee80211_hdr *hdr, bool ack)
1076 {
1077         if (!ieee80211_is_data(hdr->frame_control))
1078             return;
1079
1080         if (ack)
1081                 ieee80211_sta_reset_conn_monitor(sdata);
1082
1083         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1084             sdata->u.mgd.probe_send_count > 0) {
1085                 if (ack)
1086                         sdata->u.mgd.probe_send_count = 0;
1087                 else
1088                         sdata->u.mgd.nullfunc_failed = true;
1089                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1090         }
1091 }
1092
1093 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1094 {
1095         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1096         const u8 *ssid;
1097         u8 *dst = ifmgd->associated->bssid;
1098         u8 unicast_limit = max(1, IEEE80211_MAX_PROBE_TRIES - 3);
1099
1100         /*
1101          * Try sending broadcast probe requests for the last three
1102          * probe requests after the first ones failed since some
1103          * buggy APs only support broadcast probe requests.
1104          */
1105         if (ifmgd->probe_send_count >= unicast_limit)
1106                 dst = NULL;
1107
1108         /*
1109          * When the hardware reports an accurate Tx ACK status, it's
1110          * better to send a nullfunc frame instead of a probe request,
1111          * as it will kick us off the AP quickly if we aren't associated
1112          * anymore. The timeout will be reset if the frame is ACKed by
1113          * the AP.
1114          */
1115         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1116                 ifmgd->nullfunc_failed = false;
1117                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1118         } else {
1119                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1120                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0);
1121         }
1122
1123         ifmgd->probe_send_count++;
1124         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1125         run_again(ifmgd, ifmgd->probe_timeout);
1126 }
1127
1128 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1129                                    bool beacon)
1130 {
1131         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1132         bool already = false;
1133
1134         if (!ieee80211_sdata_running(sdata))
1135                 return;
1136
1137         if (sdata->local->scanning)
1138                 return;
1139
1140         if (sdata->local->tmp_channel)
1141                 return;
1142
1143         mutex_lock(&ifmgd->mtx);
1144
1145         if (!ifmgd->associated)
1146                 goto out;
1147
1148 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1149         if (beacon && net_ratelimit())
1150                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1151                        "- sending probe request\n", sdata->name);
1152 #endif
1153
1154         /*
1155          * The driver/our work has already reported this event or the
1156          * connection monitoring has kicked in and we have already sent
1157          * a probe request. Or maybe the AP died and the driver keeps
1158          * reporting until we disassociate...
1159          *
1160          * In either case we have to ignore the current call to this
1161          * function (except for setting the correct probe reason bit)
1162          * because otherwise we would reset the timer every time and
1163          * never check whether we received a probe response!
1164          */
1165         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1166                             IEEE80211_STA_CONNECTION_POLL))
1167                 already = true;
1168
1169         if (beacon)
1170                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1171         else
1172                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1173
1174         if (already)
1175                 goto out;
1176
1177         mutex_lock(&sdata->local->iflist_mtx);
1178         ieee80211_recalc_ps(sdata->local, -1);
1179         mutex_unlock(&sdata->local->iflist_mtx);
1180
1181         ifmgd->probe_send_count = 0;
1182         ieee80211_mgd_probe_ap_send(sdata);
1183  out:
1184         mutex_unlock(&ifmgd->mtx);
1185 }
1186
1187 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1188                                           struct ieee80211_vif *vif)
1189 {
1190         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1191         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1192         struct sk_buff *skb;
1193         const u8 *ssid;
1194
1195         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1196                 return NULL;
1197
1198         ASSERT_MGD_MTX(ifmgd);
1199
1200         if (!ifmgd->associated)
1201                 return NULL;
1202
1203         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1204         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1205                                         ssid + 2, ssid[1], NULL, 0);
1206
1207         return skb;
1208 }
1209 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1210
1211 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1212 {
1213         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1214         struct ieee80211_local *local = sdata->local;
1215         u8 bssid[ETH_ALEN];
1216
1217         mutex_lock(&ifmgd->mtx);
1218         if (!ifmgd->associated) {
1219                 mutex_unlock(&ifmgd->mtx);
1220                 return;
1221         }
1222
1223         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1224
1225         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1226
1227         ieee80211_set_disassoc(sdata, true, true);
1228         mutex_unlock(&ifmgd->mtx);
1229
1230         mutex_lock(&local->mtx);
1231         ieee80211_recalc_idle(local);
1232         mutex_unlock(&local->mtx);
1233         /*
1234          * must be outside lock due to cfg80211,
1235          * but that's not a problem.
1236          */
1237         ieee80211_send_deauth_disassoc(sdata, bssid,
1238                                        IEEE80211_STYPE_DEAUTH,
1239                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1240                                        NULL, true);
1241 }
1242
1243 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1244 {
1245         struct ieee80211_sub_if_data *sdata =
1246                 container_of(work, struct ieee80211_sub_if_data,
1247                              u.mgd.beacon_connection_loss_work);
1248
1249         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1250                 __ieee80211_connection_loss(sdata);
1251         else
1252                 ieee80211_mgd_probe_ap(sdata, true);
1253 }
1254
1255 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1256 {
1257         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1258         struct ieee80211_hw *hw = &sdata->local->hw;
1259
1260         trace_api_beacon_loss(sdata);
1261
1262         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1263         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1264 }
1265 EXPORT_SYMBOL(ieee80211_beacon_loss);
1266
1267 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1268 {
1269         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1270         struct ieee80211_hw *hw = &sdata->local->hw;
1271
1272         trace_api_connection_loss(sdata);
1273
1274         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1275         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1276 }
1277 EXPORT_SYMBOL(ieee80211_connection_loss);
1278
1279
1280 static enum rx_mgmt_action __must_check
1281 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1282                          struct ieee80211_mgmt *mgmt, size_t len)
1283 {
1284         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1285         const u8 *bssid = NULL;
1286         u16 reason_code;
1287
1288         if (len < 24 + 2)
1289                 return RX_MGMT_NONE;
1290
1291         ASSERT_MGD_MTX(ifmgd);
1292
1293         bssid = ifmgd->associated->bssid;
1294
1295         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1296
1297         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1298                         sdata->name, bssid, reason_code);
1299
1300         ieee80211_set_disassoc(sdata, true, false);
1301         mutex_lock(&sdata->local->mtx);
1302         ieee80211_recalc_idle(sdata->local);
1303         mutex_unlock(&sdata->local->mtx);
1304
1305         return RX_MGMT_CFG80211_DEAUTH;
1306 }
1307
1308
1309 static enum rx_mgmt_action __must_check
1310 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1311                            struct ieee80211_mgmt *mgmt, size_t len)
1312 {
1313         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1314         u16 reason_code;
1315
1316         if (len < 24 + 2)
1317                 return RX_MGMT_NONE;
1318
1319         ASSERT_MGD_MTX(ifmgd);
1320
1321         if (WARN_ON(!ifmgd->associated))
1322                 return RX_MGMT_NONE;
1323
1324         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1325                 return RX_MGMT_NONE;
1326
1327         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1328
1329         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1330                         sdata->name, mgmt->sa, reason_code);
1331
1332         ieee80211_set_disassoc(sdata, true, false);
1333         mutex_lock(&sdata->local->mtx);
1334         ieee80211_recalc_idle(sdata->local);
1335         mutex_unlock(&sdata->local->mtx);
1336         return RX_MGMT_CFG80211_DISASSOC;
1337 }
1338
1339
1340 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1341                                     struct ieee80211_mgmt *mgmt, size_t len)
1342 {
1343         struct ieee80211_sub_if_data *sdata = wk->sdata;
1344         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1345         struct ieee80211_local *local = sdata->local;
1346         struct ieee80211_supported_band *sband;
1347         struct sta_info *sta;
1348         struct cfg80211_bss *cbss = wk->assoc.bss;
1349         u8 *pos;
1350         u32 rates, basic_rates;
1351         u16 capab_info, aid;
1352         struct ieee802_11_elems elems;
1353         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1354         u32 changed = 0;
1355         int i, j, err;
1356         bool have_higher_than_11mbit = false;
1357         u16 ap_ht_cap_flags;
1358
1359         /* AssocResp and ReassocResp have identical structure */
1360
1361         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1362         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1363
1364         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1365                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1366                        "set\n", sdata->name, aid);
1367         aid &= ~(BIT(15) | BIT(14));
1368
1369         pos = mgmt->u.assoc_resp.variable;
1370         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1371
1372         if (!elems.supp_rates) {
1373                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1374                        sdata->name);
1375                 return false;
1376         }
1377
1378         ifmgd->aid = aid;
1379
1380         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1381         if (!sta) {
1382                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1383                        " the AP\n", sdata->name);
1384                 return false;
1385         }
1386
1387         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1388                            WLAN_STA_ASSOC_AP);
1389         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1390                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1391
1392         rates = 0;
1393         basic_rates = 0;
1394         sband = local->hw.wiphy->bands[wk->chan->band];
1395
1396         for (i = 0; i < elems.supp_rates_len; i++) {
1397                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1398                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1399
1400                 if (rate > 110)
1401                         have_higher_than_11mbit = true;
1402
1403                 for (j = 0; j < sband->n_bitrates; j++) {
1404                         if (sband->bitrates[j].bitrate == rate) {
1405                                 rates |= BIT(j);
1406                                 if (is_basic)
1407                                         basic_rates |= BIT(j);
1408                                 break;
1409                         }
1410                 }
1411         }
1412
1413         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1414                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1415                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1416
1417                 if (rate > 110)
1418                         have_higher_than_11mbit = true;
1419
1420                 for (j = 0; j < sband->n_bitrates; j++) {
1421                         if (sband->bitrates[j].bitrate == rate) {
1422                                 rates |= BIT(j);
1423                                 if (is_basic)
1424                                         basic_rates |= BIT(j);
1425                                 break;
1426                         }
1427                 }
1428         }
1429
1430         sta->sta.supp_rates[wk->chan->band] = rates;
1431         sdata->vif.bss_conf.basic_rates = basic_rates;
1432
1433         /* cf. IEEE 802.11 9.2.12 */
1434         if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1435             have_higher_than_11mbit)
1436                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1437         else
1438                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1439
1440         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1441                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1442                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1443
1444         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1445
1446         rate_control_rate_init(sta);
1447
1448         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1449                 set_sta_flags(sta, WLAN_STA_MFP);
1450
1451         if (elems.wmm_param)
1452                 set_sta_flags(sta, WLAN_STA_WME);
1453
1454         err = sta_info_insert(sta);
1455         sta = NULL;
1456         if (err) {
1457                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1458                        " the AP (error %d)\n", sdata->name, err);
1459                 return false;
1460         }
1461
1462         /*
1463          * Always handle WMM once after association regardless
1464          * of the first value the AP uses. Setting -1 here has
1465          * that effect because the AP values is an unsigned
1466          * 4-bit value.
1467          */
1468         ifmgd->wmm_last_param_set = -1;
1469
1470         if (elems.wmm_param)
1471                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1472                                          elems.wmm_param_len);
1473         else
1474                 ieee80211_set_wmm_default(sdata);
1475
1476         local->oper_channel = wk->chan;
1477
1478         if (elems.ht_info_elem && elems.wmm_param &&
1479             (sdata->local->hw.queues >= 4) &&
1480             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1481                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1482                                                cbss->bssid, ap_ht_cap_flags);
1483
1484         /* set AID and assoc capability,
1485          * ieee80211_set_associated() will tell the driver */
1486         bss_conf->aid = aid;
1487         bss_conf->assoc_capability = capab_info;
1488         ieee80211_set_associated(sdata, cbss, changed);
1489
1490         /*
1491          * If we're using 4-addr mode, let the AP know that we're
1492          * doing so, so that it can create the STA VLAN on its side
1493          */
1494         if (ifmgd->use_4addr)
1495                 ieee80211_send_4addr_nullfunc(local, sdata);
1496
1497         /*
1498          * Start timer to probe the connection to the AP now.
1499          * Also start the timer that will detect beacon loss.
1500          */
1501         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1502         ieee80211_sta_reset_beacon_monitor(sdata);
1503
1504         return true;
1505 }
1506
1507
1508 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1509                                   struct ieee80211_mgmt *mgmt,
1510                                   size_t len,
1511                                   struct ieee80211_rx_status *rx_status,
1512                                   struct ieee802_11_elems *elems,
1513                                   bool beacon)
1514 {
1515         struct ieee80211_local *local = sdata->local;
1516         int freq;
1517         struct ieee80211_bss *bss;
1518         struct ieee80211_channel *channel;
1519         bool need_ps = false;
1520
1521         if (sdata->u.mgd.associated) {
1522                 bss = (void *)sdata->u.mgd.associated->priv;
1523                 /* not previously set so we may need to recalc */
1524                 need_ps = !bss->dtim_period;
1525         }
1526
1527         if (elems->ds_params && elems->ds_params_len == 1)
1528                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1529         else
1530                 freq = rx_status->freq;
1531
1532         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1533
1534         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1535                 return;
1536
1537         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1538                                         channel, beacon);
1539         if (bss)
1540                 ieee80211_rx_bss_put(local, bss);
1541
1542         if (!sdata->u.mgd.associated)
1543                 return;
1544
1545         if (need_ps) {
1546                 mutex_lock(&local->iflist_mtx);
1547                 ieee80211_recalc_ps(local, -1);
1548                 mutex_unlock(&local->iflist_mtx);
1549         }
1550
1551         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1552             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1553                                                         ETH_ALEN) == 0)) {
1554                 struct ieee80211_channel_sw_ie *sw_elem =
1555                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1556                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1557                                                  bss, rx_status->mactime);
1558         }
1559 }
1560
1561
1562 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1563                                          struct sk_buff *skb)
1564 {
1565         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1566         struct ieee80211_if_managed *ifmgd;
1567         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1568         size_t baselen, len = skb->len;
1569         struct ieee802_11_elems elems;
1570
1571         ifmgd = &sdata->u.mgd;
1572
1573         ASSERT_MGD_MTX(ifmgd);
1574
1575         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1576                 return; /* ignore ProbeResp to foreign address */
1577
1578         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1579         if (baselen > len)
1580                 return;
1581
1582         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1583                                 &elems);
1584
1585         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1586
1587         if (ifmgd->associated &&
1588             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1589                 ieee80211_reset_ap_probe(sdata);
1590 }
1591
1592 /*
1593  * This is the canonical list of information elements we care about,
1594  * the filter code also gives us all changes to the Microsoft OUI
1595  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1596  *
1597  * We implement beacon filtering in software since that means we can
1598  * avoid processing the frame here and in cfg80211, and userspace
1599  * will not be able to tell whether the hardware supports it or not.
1600  *
1601  * XXX: This list needs to be dynamic -- userspace needs to be able to
1602  *      add items it requires. It also needs to be able to tell us to
1603  *      look out for other vendor IEs.
1604  */
1605 static const u64 care_about_ies =
1606         (1ULL << WLAN_EID_COUNTRY) |
1607         (1ULL << WLAN_EID_ERP_INFO) |
1608         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1609         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1610         (1ULL << WLAN_EID_HT_CAPABILITY) |
1611         (1ULL << WLAN_EID_HT_INFORMATION);
1612
1613 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1614                                      struct ieee80211_mgmt *mgmt,
1615                                      size_t len,
1616                                      struct ieee80211_rx_status *rx_status)
1617 {
1618         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1619         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1620         size_t baselen;
1621         struct ieee802_11_elems elems;
1622         struct ieee80211_local *local = sdata->local;
1623         u32 changed = 0;
1624         bool erp_valid, directed_tim = false;
1625         u8 erp_value = 0;
1626         u32 ncrc;
1627         u8 *bssid;
1628
1629         ASSERT_MGD_MTX(ifmgd);
1630
1631         /* Process beacon from the current BSS */
1632         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1633         if (baselen > len)
1634                 return;
1635
1636         if (rx_status->freq != local->hw.conf.channel->center_freq)
1637                 return;
1638
1639         /*
1640          * We might have received a number of frames, among them a
1641          * disassoc frame and a beacon...
1642          */
1643         if (!ifmgd->associated)
1644                 return;
1645
1646         bssid = ifmgd->associated->bssid;
1647
1648         /*
1649          * And in theory even frames from a different AP we were just
1650          * associated to a split-second ago!
1651          */
1652         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1653                 return;
1654
1655         /* Track average RSSI from the Beacon frames of the current AP */
1656         ifmgd->last_beacon_signal = rx_status->signal;
1657         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1658                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1659                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1660                 ifmgd->last_cqm_event_signal = 0;
1661                 ifmgd->count_beacon_signal = 1;
1662         } else {
1663                 ifmgd->ave_beacon_signal =
1664                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1665                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1666                          ifmgd->ave_beacon_signal) / 16;
1667                 ifmgd->count_beacon_signal++;
1668         }
1669         if (bss_conf->cqm_rssi_thold &&
1670             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1671             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1672                 int sig = ifmgd->ave_beacon_signal / 16;
1673                 int last_event = ifmgd->last_cqm_event_signal;
1674                 int thold = bss_conf->cqm_rssi_thold;
1675                 int hyst = bss_conf->cqm_rssi_hyst;
1676                 if (sig < thold &&
1677                     (last_event == 0 || sig < last_event - hyst)) {
1678                         ifmgd->last_cqm_event_signal = sig;
1679                         ieee80211_cqm_rssi_notify(
1680                                 &sdata->vif,
1681                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1682                                 GFP_KERNEL);
1683                 } else if (sig > thold &&
1684                            (last_event == 0 || sig > last_event + hyst)) {
1685                         ifmgd->last_cqm_event_signal = sig;
1686                         ieee80211_cqm_rssi_notify(
1687                                 &sdata->vif,
1688                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1689                                 GFP_KERNEL);
1690                 }
1691         }
1692
1693         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1694 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1695                 if (net_ratelimit()) {
1696                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1697                                "to a received beacon\n", sdata->name);
1698                 }
1699 #endif
1700                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1701                 mutex_lock(&local->iflist_mtx);
1702                 ieee80211_recalc_ps(local, -1);
1703                 mutex_unlock(&local->iflist_mtx);
1704         }
1705
1706         /*
1707          * Push the beacon loss detection into the future since
1708          * we are processing a beacon from the AP just now.
1709          */
1710         ieee80211_sta_reset_beacon_monitor(sdata);
1711
1712         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1713         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1714                                           len - baselen, &elems,
1715                                           care_about_ies, ncrc);
1716
1717         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1718                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1719                                                    ifmgd->aid);
1720
1721         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1722                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1723                                       true);
1724
1725                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1726                                          elems.wmm_param_len);
1727         }
1728
1729         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1730                 if (directed_tim) {
1731                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1732                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1733                                 ieee80211_hw_config(local,
1734                                                     IEEE80211_CONF_CHANGE_PS);
1735                                 ieee80211_send_nullfunc(local, sdata, 0);
1736                         } else {
1737                                 local->pspolling = true;
1738
1739                                 /*
1740                                  * Here is assumed that the driver will be
1741                                  * able to send ps-poll frame and receive a
1742                                  * response even though power save mode is
1743                                  * enabled, but some drivers might require
1744                                  * to disable power save here. This needs
1745                                  * to be investigated.
1746                                  */
1747                                 ieee80211_send_pspoll(local, sdata);
1748                         }
1749                 }
1750         }
1751
1752         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1753                 return;
1754         ifmgd->beacon_crc = ncrc;
1755         ifmgd->beacon_crc_valid = true;
1756
1757         if (elems.erp_info && elems.erp_info_len >= 1) {
1758                 erp_valid = true;
1759                 erp_value = elems.erp_info[0];
1760         } else {
1761                 erp_valid = false;
1762         }
1763         changed |= ieee80211_handle_bss_capability(sdata,
1764                         le16_to_cpu(mgmt->u.beacon.capab_info),
1765                         erp_valid, erp_value);
1766
1767
1768         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1769             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1770                 struct sta_info *sta;
1771                 struct ieee80211_supported_band *sband;
1772                 u16 ap_ht_cap_flags;
1773
1774                 rcu_read_lock();
1775
1776                 sta = sta_info_get(sdata, bssid);
1777                 if (WARN_ON(!sta)) {
1778                         rcu_read_unlock();
1779                         return;
1780                 }
1781
1782                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1783
1784                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1785                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1786
1787                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1788
1789                 rcu_read_unlock();
1790
1791                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1792                                                bssid, ap_ht_cap_flags);
1793         }
1794
1795         /* Note: country IE parsing is done for us by cfg80211 */
1796         if (elems.country_elem) {
1797                 /* TODO: IBSS also needs this */
1798                 if (elems.pwr_constr_elem)
1799                         ieee80211_handle_pwr_constr(sdata,
1800                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1801                                 elems.pwr_constr_elem,
1802                                 elems.pwr_constr_elem_len);
1803         }
1804
1805         ieee80211_bss_info_change_notify(sdata, changed);
1806 }
1807
1808 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1809                                   struct sk_buff *skb)
1810 {
1811         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1812         struct ieee80211_rx_status *rx_status;
1813         struct ieee80211_mgmt *mgmt;
1814         enum rx_mgmt_action rma = RX_MGMT_NONE;
1815         u16 fc;
1816
1817         rx_status = (struct ieee80211_rx_status *) skb->cb;
1818         mgmt = (struct ieee80211_mgmt *) skb->data;
1819         fc = le16_to_cpu(mgmt->frame_control);
1820
1821         mutex_lock(&ifmgd->mtx);
1822
1823         if (ifmgd->associated &&
1824             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1825                 switch (fc & IEEE80211_FCTL_STYPE) {
1826                 case IEEE80211_STYPE_BEACON:
1827                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1828                                                  rx_status);
1829                         break;
1830                 case IEEE80211_STYPE_PROBE_RESP:
1831                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1832                         break;
1833                 case IEEE80211_STYPE_DEAUTH:
1834                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1835                         break;
1836                 case IEEE80211_STYPE_DISASSOC:
1837                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1838                         break;
1839                 case IEEE80211_STYPE_ACTION:
1840                         switch (mgmt->u.action.category) {
1841                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1842                                 ieee80211_sta_process_chanswitch(sdata,
1843                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1844                                                 (void *)ifmgd->associated->priv,
1845                                                 rx_status->mactime);
1846                                 break;
1847                         }
1848                 }
1849                 mutex_unlock(&ifmgd->mtx);
1850
1851                 switch (rma) {
1852                 case RX_MGMT_NONE:
1853                         /* no action */
1854                         break;
1855                 case RX_MGMT_CFG80211_DEAUTH:
1856                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1857                         break;
1858                 case RX_MGMT_CFG80211_DISASSOC:
1859                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1860                         break;
1861                 default:
1862                         WARN(1, "unexpected: %d", rma);
1863                 }
1864                 return;
1865         }
1866
1867         mutex_unlock(&ifmgd->mtx);
1868
1869         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1870             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1871                 struct ieee80211_local *local = sdata->local;
1872                 struct ieee80211_work *wk;
1873
1874                 mutex_lock(&local->mtx);
1875                 list_for_each_entry(wk, &local->work_list, list) {
1876                         if (wk->sdata != sdata)
1877                                 continue;
1878
1879                         if (wk->type != IEEE80211_WORK_ASSOC &&
1880                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1881                                 continue;
1882
1883                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1884                                 continue;
1885                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1886                                 continue;
1887
1888                         /*
1889                          * Printing the message only here means we can't
1890                          * spuriously print it, but it also means that it
1891                          * won't be printed when the frame comes in before
1892                          * we even tried to associate or in similar cases.
1893                          *
1894                          * Ultimately, I suspect cfg80211 should print the
1895                          * messages instead.
1896                          */
1897                         printk(KERN_DEBUG
1898                                "%s: deauthenticated from %pM (Reason: %u)\n",
1899                                sdata->name, mgmt->bssid,
1900                                le16_to_cpu(mgmt->u.deauth.reason_code));
1901
1902                         list_del_rcu(&wk->list);
1903                         free_work(wk);
1904                         break;
1905                 }
1906                 mutex_unlock(&local->mtx);
1907
1908                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1909         }
1910 }
1911
1912 static void ieee80211_sta_timer(unsigned long data)
1913 {
1914         struct ieee80211_sub_if_data *sdata =
1915                 (struct ieee80211_sub_if_data *) data;
1916         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1917         struct ieee80211_local *local = sdata->local;
1918
1919         if (local->quiescing) {
1920                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1921                 return;
1922         }
1923
1924         ieee80211_queue_work(&local->hw, &sdata->work);
1925 }
1926
1927 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
1928                                           u8 *bssid)
1929 {
1930         struct ieee80211_local *local = sdata->local;
1931         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1932
1933         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1934                           IEEE80211_STA_BEACON_POLL);
1935
1936         ieee80211_set_disassoc(sdata, true, true);
1937         mutex_unlock(&ifmgd->mtx);
1938         mutex_lock(&local->mtx);
1939         ieee80211_recalc_idle(local);
1940         mutex_unlock(&local->mtx);
1941         /*
1942          * must be outside lock due to cfg80211,
1943          * but that's not a problem.
1944          */
1945         ieee80211_send_deauth_disassoc(sdata, bssid,
1946                         IEEE80211_STYPE_DEAUTH,
1947                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1948                         NULL, true);
1949         mutex_lock(&ifmgd->mtx);
1950 }
1951
1952 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
1953 {
1954         struct ieee80211_local *local = sdata->local;
1955         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1956
1957         /* then process the rest of the work */
1958         mutex_lock(&ifmgd->mtx);
1959
1960         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1961                             IEEE80211_STA_CONNECTION_POLL) &&
1962             ifmgd->associated) {
1963                 u8 bssid[ETH_ALEN];
1964                 int max_tries;
1965
1966                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1967
1968                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1969                         max_tries = IEEE80211_MAX_NULLFUNC_TRIES;
1970                 else
1971                         max_tries = IEEE80211_MAX_PROBE_TRIES;
1972
1973                 /* ACK received for nullfunc probing frame */
1974                 if (!ifmgd->probe_send_count)
1975                         ieee80211_reset_ap_probe(sdata);
1976                 else if (ifmgd->nullfunc_failed) {
1977                         if (ifmgd->probe_send_count < max_tries) {
1978 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1979                                 wiphy_debug(local->hw.wiphy,
1980                                             "%s: No ack for nullfunc frame to"
1981                                             " AP %pM, try %d\n",
1982                                             sdata->name, bssid,
1983                                             ifmgd->probe_send_count);
1984 #endif
1985                                 ieee80211_mgd_probe_ap_send(sdata);
1986                         } else {
1987 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1988                                 wiphy_debug(local->hw.wiphy,
1989                                             "%s: No ack for nullfunc frame to"
1990                                             " AP %pM, disconnecting.\n",
1991                                             sdata->name, bssid);
1992 #endif
1993                                 ieee80211_sta_connection_lost(sdata, bssid);
1994                         }
1995                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
1996                         run_again(ifmgd, ifmgd->probe_timeout);
1997                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1998 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1999                         wiphy_debug(local->hw.wiphy,
2000                                     "%s: Failed to send nullfunc to AP %pM"
2001                                     " after %dms, disconnecting.\n",
2002                                     sdata->name,
2003                                     bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
2004 #endif
2005                         ieee80211_sta_connection_lost(sdata, bssid);
2006                 } else if (ifmgd->probe_send_count < max_tries) {
2007 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2008                         wiphy_debug(local->hw.wiphy,
2009                                     "%s: No probe response from AP %pM"
2010                                     " after %dms, try %d\n",
2011                                     sdata->name,
2012                                     bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ,
2013                                     ifmgd->probe_send_count);
2014 #endif
2015                         ieee80211_mgd_probe_ap_send(sdata);
2016                 } else {
2017                         /*
2018                          * We actually lost the connection ... or did we?
2019                          * Let's make sure!
2020                          */
2021                         wiphy_debug(local->hw.wiphy,
2022                                     "%s: No probe response from AP %pM"
2023                                     " after %dms, disconnecting.\n",
2024                                     sdata->name,
2025                                     bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
2026
2027                         ieee80211_sta_connection_lost(sdata, bssid);
2028                 }
2029         }
2030
2031         mutex_unlock(&ifmgd->mtx);
2032 }
2033
2034 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2035 {
2036         struct ieee80211_sub_if_data *sdata =
2037                 (struct ieee80211_sub_if_data *) data;
2038         struct ieee80211_local *local = sdata->local;
2039
2040         if (local->quiescing)
2041                 return;
2042
2043         ieee80211_queue_work(&sdata->local->hw,
2044                              &sdata->u.mgd.beacon_connection_loss_work);
2045 }
2046
2047 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2048 {
2049         struct ieee80211_sub_if_data *sdata =
2050                 (struct ieee80211_sub_if_data *) data;
2051         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2052         struct ieee80211_local *local = sdata->local;
2053
2054         if (local->quiescing)
2055                 return;
2056
2057         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2058 }
2059
2060 static void ieee80211_sta_monitor_work(struct work_struct *work)
2061 {
2062         struct ieee80211_sub_if_data *sdata =
2063                 container_of(work, struct ieee80211_sub_if_data,
2064                              u.mgd.monitor_work);
2065
2066         ieee80211_mgd_probe_ap(sdata, false);
2067 }
2068
2069 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2070 {
2071         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2072                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2073                                         IEEE80211_STA_CONNECTION_POLL);
2074
2075                 /* let's probe the connection once */
2076                 ieee80211_queue_work(&sdata->local->hw,
2077                            &sdata->u.mgd.monitor_work);
2078                 /* and do all the other regular work too */
2079                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2080         }
2081 }
2082
2083 #ifdef CONFIG_PM
2084 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2085 {
2086         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2087
2088         /*
2089          * we need to use atomic bitops for the running bits
2090          * only because both timers might fire at the same
2091          * time -- the code here is properly synchronised.
2092          */
2093
2094         cancel_work_sync(&ifmgd->request_smps_work);
2095
2096         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2097         if (del_timer_sync(&ifmgd->timer))
2098                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2099
2100         cancel_work_sync(&ifmgd->chswitch_work);
2101         if (del_timer_sync(&ifmgd->chswitch_timer))
2102                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2103
2104         cancel_work_sync(&ifmgd->monitor_work);
2105         /* these will just be re-established on connection */
2106         del_timer_sync(&ifmgd->conn_mon_timer);
2107         del_timer_sync(&ifmgd->bcn_mon_timer);
2108 }
2109
2110 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2111 {
2112         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2113
2114         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2115                 add_timer(&ifmgd->timer);
2116         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2117                 add_timer(&ifmgd->chswitch_timer);
2118         ieee80211_sta_reset_beacon_monitor(sdata);
2119         ieee80211_restart_sta_timer(sdata);
2120 }
2121 #endif
2122
2123 /* interface setup */
2124 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2125 {
2126         struct ieee80211_if_managed *ifmgd;
2127
2128         ifmgd = &sdata->u.mgd;
2129         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2130         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2131         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2132                   ieee80211_beacon_connection_loss_work);
2133         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2134         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2135                     (unsigned long) sdata);
2136         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2137                     (unsigned long) sdata);
2138         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2139                     (unsigned long) sdata);
2140         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2141                     (unsigned long) sdata);
2142
2143         ifmgd->flags = 0;
2144
2145         mutex_init(&ifmgd->mtx);
2146
2147         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2148                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2149         else
2150                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2151 }
2152
2153 /* scan finished notification */
2154 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2155 {
2156         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2157
2158         /* Restart STA timers */
2159         rcu_read_lock();
2160         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2161                 ieee80211_restart_sta_timer(sdata);
2162         rcu_read_unlock();
2163 }
2164
2165 int ieee80211_max_network_latency(struct notifier_block *nb,
2166                                   unsigned long data, void *dummy)
2167 {
2168         s32 latency_usec = (s32) data;
2169         struct ieee80211_local *local =
2170                 container_of(nb, struct ieee80211_local,
2171                              network_latency_notifier);
2172
2173         mutex_lock(&local->iflist_mtx);
2174         ieee80211_recalc_ps(local, latency_usec);
2175         mutex_unlock(&local->iflist_mtx);
2176
2177         return 0;
2178 }
2179
2180 /* config hooks */
2181 static enum work_done_result
2182 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2183                           struct sk_buff *skb)
2184 {
2185         if (!skb) {
2186                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2187                 return WORK_DONE_DESTROY;
2188         }
2189
2190         if (wk->type == IEEE80211_WORK_AUTH) {
2191                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2192                 return WORK_DONE_DESTROY;
2193         }
2194
2195         mutex_lock(&wk->sdata->u.mgd.mtx);
2196         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2197         mutex_unlock(&wk->sdata->u.mgd.mtx);
2198
2199         wk->type = IEEE80211_WORK_AUTH;
2200         wk->probe_auth.tries = 0;
2201         return WORK_DONE_REQUEUE;
2202 }
2203
2204 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2205                        struct cfg80211_auth_request *req)
2206 {
2207         const u8 *ssid;
2208         struct ieee80211_work *wk;
2209         u16 auth_alg;
2210
2211         if (req->local_state_change)
2212                 return 0; /* no need to update mac80211 state */
2213
2214         switch (req->auth_type) {
2215         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2216                 auth_alg = WLAN_AUTH_OPEN;
2217                 break;
2218         case NL80211_AUTHTYPE_SHARED_KEY:
2219                 if (IS_ERR(sdata->local->wep_tx_tfm))
2220                         return -EOPNOTSUPP;
2221                 auth_alg = WLAN_AUTH_SHARED_KEY;
2222                 break;
2223         case NL80211_AUTHTYPE_FT:
2224                 auth_alg = WLAN_AUTH_FT;
2225                 break;
2226         case NL80211_AUTHTYPE_NETWORK_EAP:
2227                 auth_alg = WLAN_AUTH_LEAP;
2228                 break;
2229         default:
2230                 return -EOPNOTSUPP;
2231         }
2232
2233         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2234         if (!wk)
2235                 return -ENOMEM;
2236
2237         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2238
2239         if (req->ie && req->ie_len) {
2240                 memcpy(wk->ie, req->ie, req->ie_len);
2241                 wk->ie_len = req->ie_len;
2242         }
2243
2244         if (req->key && req->key_len) {
2245                 wk->probe_auth.key_len = req->key_len;
2246                 wk->probe_auth.key_idx = req->key_idx;
2247                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2248         }
2249
2250         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2251         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2252         wk->probe_auth.ssid_len = ssid[1];
2253
2254         wk->probe_auth.algorithm = auth_alg;
2255         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2256
2257         /* if we already have a probe, don't probe again */
2258         if (req->bss->proberesp_ies)
2259                 wk->type = IEEE80211_WORK_AUTH;
2260         else
2261                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2262         wk->chan = req->bss->channel;
2263         wk->sdata = sdata;
2264         wk->done = ieee80211_probe_auth_done;
2265
2266         ieee80211_add_work(wk);
2267         return 0;
2268 }
2269
2270 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2271                                                   struct sk_buff *skb)
2272 {
2273         struct ieee80211_mgmt *mgmt;
2274         struct ieee80211_rx_status *rx_status;
2275         struct ieee802_11_elems elems;
2276         u16 status;
2277
2278         if (!skb) {
2279                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2280                 return WORK_DONE_DESTROY;
2281         }
2282
2283         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2284                 mutex_lock(&wk->sdata->u.mgd.mtx);
2285                 rx_status = (void *) skb->cb;
2286                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2287                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2288                                       &elems, true);
2289                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2290
2291                 wk->type = IEEE80211_WORK_ASSOC;
2292                 /* not really done yet */
2293                 return WORK_DONE_REQUEUE;
2294         }
2295
2296         mgmt = (void *)skb->data;
2297         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2298
2299         if (status == WLAN_STATUS_SUCCESS) {
2300                 mutex_lock(&wk->sdata->u.mgd.mtx);
2301                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2302                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2303                         /* oops -- internal error -- send timeout for now */
2304                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2305                                                     wk->filter_ta);
2306                         return WORK_DONE_DESTROY;
2307                 }
2308
2309                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2310         }
2311
2312         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2313         return WORK_DONE_DESTROY;
2314 }
2315
2316 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2317                         struct cfg80211_assoc_request *req)
2318 {
2319         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2320         struct ieee80211_bss *bss = (void *)req->bss->priv;
2321         struct ieee80211_work *wk;
2322         const u8 *ssid;
2323         int i;
2324
2325         mutex_lock(&ifmgd->mtx);
2326         if (ifmgd->associated) {
2327                 if (!req->prev_bssid ||
2328                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2329                            ETH_ALEN)) {
2330                         /*
2331                          * We are already associated and the request was not a
2332                          * reassociation request from the current BSS, so
2333                          * reject it.
2334                          */
2335                         mutex_unlock(&ifmgd->mtx);
2336                         return -EALREADY;
2337                 }
2338
2339                 /* Trying to reassociate - clear previous association state */
2340                 ieee80211_set_disassoc(sdata, true, false);
2341         }
2342         mutex_unlock(&ifmgd->mtx);
2343
2344         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2345         if (!wk)
2346                 return -ENOMEM;
2347
2348         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2349         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2350
2351         ifmgd->beacon_crc_valid = false;
2352
2353         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2354                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2355                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2356                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2357                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2358
2359
2360         if (req->ie && req->ie_len) {
2361                 memcpy(wk->ie, req->ie, req->ie_len);
2362                 wk->ie_len = req->ie_len;
2363         } else
2364                 wk->ie_len = 0;
2365
2366         wk->assoc.bss = req->bss;
2367
2368         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2369
2370         /* new association always uses requested smps mode */
2371         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2372                 if (ifmgd->powersave)
2373                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2374                 else
2375                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2376         } else
2377                 ifmgd->ap_smps = ifmgd->req_smps;
2378
2379         wk->assoc.smps = ifmgd->ap_smps;
2380         /*
2381          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2382          * We still associate in non-HT mode (11a/b/g) if any one of these
2383          * ciphers is configured as pairwise.
2384          * We can set this to true for non-11n hardware, that'll be checked
2385          * separately along with the peer capabilities.
2386          */
2387         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2388         wk->assoc.capability = req->bss->capability;
2389         wk->assoc.wmm_used = bss->wmm_used;
2390         wk->assoc.supp_rates = bss->supp_rates;
2391         wk->assoc.supp_rates_len = bss->supp_rates_len;
2392         wk->assoc.ht_information_ie =
2393                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2394
2395         if (bss->wmm_used && bss->uapsd_supported &&
2396             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2397                 wk->assoc.uapsd_used = true;
2398                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2399         } else {
2400                 wk->assoc.uapsd_used = false;
2401                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2402         }
2403
2404         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2405         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2406         wk->assoc.ssid_len = ssid[1];
2407
2408         if (req->prev_bssid)
2409                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2410
2411         wk->chan = req->bss->channel;
2412         wk->sdata = sdata;
2413         wk->done = ieee80211_assoc_done;
2414         if (!bss->dtim_period &&
2415             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2416                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2417         else
2418                 wk->type = IEEE80211_WORK_ASSOC;
2419
2420         if (req->use_mfp) {
2421                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2422                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2423         } else {
2424                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2425                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2426         }
2427
2428         if (req->crypto.control_port)
2429                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2430         else
2431                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2432
2433         sdata->control_port_protocol = req->crypto.control_port_ethertype;
2434         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2435
2436         ieee80211_add_work(wk);
2437         return 0;
2438 }
2439
2440 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2441                          struct cfg80211_deauth_request *req,
2442                          void *cookie)
2443 {
2444         struct ieee80211_local *local = sdata->local;
2445         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2446         struct ieee80211_work *wk;
2447         u8 bssid[ETH_ALEN];
2448         bool assoc_bss = false;
2449
2450         mutex_lock(&ifmgd->mtx);
2451
2452         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2453         if (ifmgd->associated == req->bss) {
2454                 ieee80211_set_disassoc(sdata, false, true);
2455                 mutex_unlock(&ifmgd->mtx);
2456                 assoc_bss = true;
2457         } else {
2458                 bool not_auth_yet = false;
2459
2460                 mutex_unlock(&ifmgd->mtx);
2461
2462                 mutex_lock(&local->mtx);
2463                 list_for_each_entry(wk, &local->work_list, list) {
2464                         if (wk->sdata != sdata)
2465                                 continue;
2466
2467                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2468                             wk->type != IEEE80211_WORK_AUTH &&
2469                             wk->type != IEEE80211_WORK_ASSOC &&
2470                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2471                                 continue;
2472
2473                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2474                                 continue;
2475
2476                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2477                         list_del_rcu(&wk->list);
2478                         free_work(wk);
2479                         break;
2480                 }
2481                 mutex_unlock(&local->mtx);
2482
2483                 /*
2484                  * If somebody requests authentication and we haven't
2485                  * sent out an auth frame yet there's no need to send
2486                  * out a deauth frame either. If the state was PROBE,
2487                  * then this is the case. If it's AUTH we have sent a
2488                  * frame, and if it's IDLE we have completed the auth
2489                  * process already.
2490                  */
2491                 if (not_auth_yet) {
2492                         __cfg80211_auth_canceled(sdata->dev, bssid);
2493                         return 0;
2494                 }
2495         }
2496
2497         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2498                sdata->name, bssid, req->reason_code);
2499
2500         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2501                                        req->reason_code, cookie,
2502                                        !req->local_state_change);
2503         if (assoc_bss)
2504                 sta_info_destroy_addr(sdata, bssid);
2505
2506         mutex_lock(&sdata->local->mtx);
2507         ieee80211_recalc_idle(sdata->local);
2508         mutex_unlock(&sdata->local->mtx);
2509
2510         return 0;
2511 }
2512
2513 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2514                            struct cfg80211_disassoc_request *req,
2515                            void *cookie)
2516 {
2517         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2518         u8 bssid[ETH_ALEN];
2519
2520         mutex_lock(&ifmgd->mtx);
2521
2522         /*
2523          * cfg80211 should catch this ... but it's racy since
2524          * we can receive a disassoc frame, process it, hand it
2525          * to cfg80211 while that's in a locked section already
2526          * trying to tell us that the user wants to disconnect.
2527          */
2528         if (ifmgd->associated != req->bss) {
2529                 mutex_unlock(&ifmgd->mtx);
2530                 return -ENOLINK;
2531         }
2532
2533         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2534                sdata->name, req->bss->bssid, req->reason_code);
2535
2536         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2537         ieee80211_set_disassoc(sdata, false, true);
2538
2539         mutex_unlock(&ifmgd->mtx);
2540
2541         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2542                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2543                         cookie, !req->local_state_change);
2544         sta_info_destroy_addr(sdata, bssid);
2545
2546         mutex_lock(&sdata->local->mtx);
2547         ieee80211_recalc_idle(sdata->local);
2548         mutex_unlock(&sdata->local->mtx);
2549
2550         return 0;
2551 }
2552
2553 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2554                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2555                                gfp_t gfp)
2556 {
2557         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2558
2559         trace_api_cqm_rssi_notify(sdata, rssi_event);
2560
2561         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2562 }
2563 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);