net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <[email protected]>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <[email protected]>
   7  * Copyright 2007, Michael Wu <[email protected]>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/pm_qos_params.h>
  21 #include <linux/crc32.h>
  22 #include <linux/slab.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "driver-ops.h"
  28 #include "rate.h"
  29 #include "led.h"
  30
  31 static int max_nullfunc_tries = 2;
  32 module_param(max_nullfunc_tries, int, 0644);
  33 MODULE_PARM_DESC(max_nullfunc_tries,
  34                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  35
  36 static int max_probe_tries = 5;
  37 module_param(max_probe_tries, int, 0644);
  38 MODULE_PARM_DESC(max_probe_tries,
  39                  "Maximum probe tries before disconnecting (reason 4).");
  40
  41 /*
  42  * Beacon loss timeout is calculated as N frames times the
  43  * advertised beacon interval.  This may need to be somewhat
  44  * higher than what hardware might detect to account for
  45  * delays in the host processing frames. But since we also
  46  * probe on beacon miss before declaring the connection lost
  47  * default to what we want.
  48  */
  49 #define IEEE80211_BEACON_LOSS_COUNT     7
  50
  51 /*
  52  * Time the connection can be idle before we probe
  53  * it to see if we can still talk to the AP.
  54  */
  55 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  56 /*
  57  * Time we wait for a probe response after sending
  58  * a probe request because of beacon loss or for
  59  * checking the connection still works.
  60  */
  61 static int probe_wait_ms = 500;
  62 module_param(probe_wait_ms, int, 0644);
  63 MODULE_PARM_DESC(probe_wait_ms,
  64                  "Maximum time(ms) to wait for probe response"
  65                  " before disconnecting (reason 4).");
  66
  67 /*
  68  * Weight given to the latest Beacon frame when calculating average signal
  69  * strength for Beacon frames received in the current BSS. This must be
  70  * between 1 and 15.
  71  */
  72 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  73
  74 /*
  75  * How many Beacon frames need to have been used in average signal strength
  76  * before starting to indicate signal change events.
  77  */
  78 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  79
  80 #define TMR_RUNNING_TIMER       0
  81 #define TMR_RUNNING_CHANSW      1
  82
  83 /*
  84  * All cfg80211 functions have to be called outside a locked
  85  * section so that they can acquire a lock themselves... This
  86  * is much simpler than queuing up things in cfg80211, but we
  87  * do need some indirection for that here.
  88  */
  89 enum rx_mgmt_action {
  90         /* no action required */
  91         RX_MGMT_NONE,
  92
  93         /* caller must call cfg80211_send_rx_auth() */
  94         RX_MGMT_CFG80211_AUTH,
  95
  96         /* caller must call cfg80211_send_rx_assoc() */
  97         RX_MGMT_CFG80211_ASSOC,
  98
  99         /* caller must call cfg80211_send_deauth() */
 100         RX_MGMT_CFG80211_DEAUTH,
 101
 102         /* caller must call cfg80211_send_disassoc() */
 103         RX_MGMT_CFG80211_DISASSOC,
 104
 105         /* caller must tell cfg80211 about internal error */
 106         RX_MGMT_CFG80211_ASSOC_ERROR,
 107 };
 108
 109 /* utils */
 110 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 111 {
 112         lockdep_assert_held(&ifmgd->mtx);
 113 }
 114
 115 /*
 116  * We can have multiple work items (and connection probing)
 117  * scheduling this timer, but we need to take care to only
 118  * reschedule it when it should fire _earlier_ than it was
 119  * asked for before, or if it's not pending right now. This
 120  * function ensures that. Note that it then is required to
 121  * run this function for all timeouts after the first one
 122  * has happened -- the work that runs from this timer will
 123  * do that.
 124  */
 125 static void run_again(struct ieee80211_if_managed *ifmgd,
 126                              unsigned long timeout)
 127 {
 128         ASSERT_MGD_MTX(ifmgd);
 129
 130         if (!timer_pending(&ifmgd->timer) ||
 131             time_before(timeout, ifmgd->timer.expires))
 132                 mod_timer(&ifmgd->timer, timeout);
 133 }
 134
 135 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 136 {
 137         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 138                 return;
 139
 140         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 141                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 142 }
 143
 144 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 145 {
 146         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 147
 148         if (unlikely(!sdata->u.mgd.associated))
 149                 return;
 150
 151         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 152                 return;
 153
 154         mod_timer(&sdata->u.mgd.conn_mon_timer,
 155                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 156
 157         ifmgd->probe_send_count = 0;
 158 }
 159
 160 static int ecw2cw(int ecw)
 161 {
 162         return (1 << ecw) - 1;
 163 }
 164
 165 /*
 166  * ieee80211_enable_ht should be called only after the operating band
 167  * has been determined as ht configuration depends on the hw's
 168  * HT abilities for a specific band.
 169  */
 170 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 171                                struct ieee80211_ht_info *hti,
 172                                const u8 *bssid, u16 ap_ht_cap_flags)
 173 {
 174         struct ieee80211_local *local = sdata->local;
 175         struct ieee80211_supported_band *sband;
 176         struct sta_info *sta;
 177         u32 changed = 0;
 178         int hti_cfreq;
 179         u16 ht_opmode;
 180         bool enable_ht = true;
 181         enum nl80211_channel_type prev_chantype;
 182         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 183
 184         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 185
 186         prev_chantype = sdata->vif.bss_conf.channel_type;
 187
 188         /* HT is not supported */
 189         if (!sband->ht_cap.ht_supported)
 190                 enable_ht = false;
 191
 192         if (enable_ht) {
 193                 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
 194                                                            sband->band);
 195                 /* check that channel matches the right operating channel */
 196                 if (local->hw.conf.channel->center_freq != hti_cfreq) {
 197                         /* Some APs mess this up, evidently.
 198                          * Netgear WNDR3700 sometimes reports 4 higher than
 199                          * the actual channel, for instance.
 200                          */
 201                         printk(KERN_DEBUG
 202                                "%s: Wrong control channel in association"
 203                                " response: configured center-freq: %d"
 204                                " hti-cfreq: %d  hti->control_chan: %d"
 205                                " band: %d.  Disabling HT.\n",
 206                                sdata->name,
 207                                local->hw.conf.channel->center_freq,
 208                                hti_cfreq, hti->control_chan,
 209                                sband->band);
 210                         enable_ht = false;
 211                 }
 212         }
 213
 214         if (enable_ht) {
 215                 channel_type = NL80211_CHAN_HT20;
 216
 217                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 218                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 219                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 220                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 221                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 222                                 if (!(local->hw.conf.channel->flags &
 223                                     IEEE80211_CHAN_NO_HT40PLUS))
 224                                         channel_type = NL80211_CHAN_HT40PLUS;
 225                                 break;
 226                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 227                                 if (!(local->hw.conf.channel->flags &
 228                                     IEEE80211_CHAN_NO_HT40MINUS))
 229                                         channel_type = NL80211_CHAN_HT40MINUS;
 230                                 break;
 231                         }
 232                 }
 233         }
 234
 235         if (local->tmp_channel)
 236                 local->tmp_channel_type = channel_type;
 237
 238         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 239                 /* can only fail due to HT40+/- mismatch */
 240                 channel_type = NL80211_CHAN_HT20;
 241                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 242         }
 243
 244         /* channel_type change automatically detected */
 245         ieee80211_hw_config(local, 0);
 246
 247         if (prev_chantype != channel_type) {
 248                 rcu_read_lock();
 249                 sta = sta_info_get(sdata, bssid);
 250                 if (sta)
 251                         rate_control_rate_update(local, sband, sta,
 252                                                  IEEE80211_RC_HT_CHANGED,
 253                                                  channel_type);
 254                 rcu_read_unlock();
 255         }
 256
 257         ht_opmode = le16_to_cpu(hti->operation_mode);
 258
 259         /* if bss configuration changed store the new one */
 260         if (sdata->ht_opmode_valid != enable_ht ||
 261             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 262             prev_chantype != channel_type) {
 263                 changed |= BSS_CHANGED_HT;
 264                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 265                 sdata->ht_opmode_valid = enable_ht;
 266         }
 267
 268         return changed;
 269 }
 270
 271 /* frame sending functions */
 272
 273 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 274                                            const u8 *bssid, u16 stype, u16 reason,
 275                                            void *cookie, bool send_frame)
 276 {
 277         struct ieee80211_local *local = sdata->local;
 278         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 279         struct sk_buff *skb;
 280         struct ieee80211_mgmt *mgmt;
 281
 282         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 283         if (!skb) {
 284                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 285                        "deauth/disassoc frame\n", sdata->name);
 286                 return;
 287         }
 288         skb_reserve(skb, local->hw.extra_tx_headroom);
 289
 290         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 291         memset(mgmt, 0, 24);
 292         memcpy(mgmt->da, bssid, ETH_ALEN);
 293         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 294         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 295         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 296         skb_put(skb, 2);
 297         /* u.deauth.reason_code == u.disassoc.reason_code */
 298         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 299
 300         if (stype == IEEE80211_STYPE_DEAUTH)
 301                 if (cookie)
 302                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 303                 else
 304                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 305         else
 306                 if (cookie)
 307                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 308                 else
 309                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 310         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 311                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 312
 313         if (send_frame)
 314                 ieee80211_tx_skb(sdata, skb);
 315         else
 316                 kfree_skb(skb);
 317 }
 318
 319 void ieee80211_send_pspoll(struct ieee80211_local *local,
 320                            struct ieee80211_sub_if_data *sdata)
 321 {
 322         struct ieee80211_pspoll *pspoll;
 323         struct sk_buff *skb;
 324
 325         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 326         if (!skb)
 327                 return;
 328
 329         pspoll = (struct ieee80211_pspoll *) skb->data;
 330         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 331
 332         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 333         ieee80211_tx_skb(sdata, skb);
 334 }
 335
 336 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 337                              struct ieee80211_sub_if_data *sdata,
 338                              int powersave)
 339 {
 340         struct sk_buff *skb;
 341         struct ieee80211_hdr_3addr *nullfunc;
 342
 343         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 344         if (!skb)
 345                 return;
 346
 347         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 348         if (powersave)
 349                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 350
 351         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 352         ieee80211_tx_skb(sdata, skb);
 353 }
 354
 355 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 356                                           struct ieee80211_sub_if_data *sdata)
 357 {
 358         struct sk_buff *skb;
 359         struct ieee80211_hdr *nullfunc;
 360         __le16 fc;
 361
 362         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 363                 return;
 364
 365         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 366         if (!skb) {
 367                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 368                        "nullfunc frame\n", sdata->name);
 369                 return;
 370         }
 371         skb_reserve(skb, local->hw.extra_tx_headroom);
 372
 373         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 374         memset(nullfunc, 0, 30);
 375         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 376                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 377         nullfunc->frame_control = fc;
 378         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 379         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 380         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 381         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 382
 383         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 384         ieee80211_tx_skb(sdata, skb);
 385 }
 386
 387 /* spectrum management related things */
 388 static void ieee80211_chswitch_work(struct work_struct *work)
 389 {
 390         struct ieee80211_sub_if_data *sdata =
 391                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 392         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 393
 394         if (!ieee80211_sdata_running(sdata))
 395                 return;
 396
 397         mutex_lock(&ifmgd->mtx);
 398         if (!ifmgd->associated)
 399                 goto out;
 400
 401         sdata->local->oper_channel = sdata->local->csa_channel;
 402         if (!sdata->local->ops->channel_switch) {
 403                 /* call "hw_config" only if doing sw channel switch */
 404                 ieee80211_hw_config(sdata->local,
 405                         IEEE80211_CONF_CHANGE_CHANNEL);
 406         }
 407
 408         /* XXX: shouldn't really modify cfg80211-owned data! */
 409         ifmgd->associated->channel = sdata->local->oper_channel;
 410
 411         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 412                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 413  out:
 414         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 415         mutex_unlock(&ifmgd->mtx);
 416 }
 417
 418 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 419 {
 420         struct ieee80211_sub_if_data *sdata;
 421         struct ieee80211_if_managed *ifmgd;
 422
 423         sdata = vif_to_sdata(vif);
 424         ifmgd = &sdata->u.mgd;
 425
 426         trace_api_chswitch_done(sdata, success);
 427         if (!success) {
 428                 /*
 429                  * If the channel switch was not successful, stay
 430                  * around on the old channel. We currently lack
 431                  * good handling of this situation, possibly we
 432                  * should just drop the association.
 433                  */
 434                 sdata->local->csa_channel = sdata->local->oper_channel;
 435         }
 436
 437         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 438 }
 439 EXPORT_SYMBOL(ieee80211_chswitch_done);
 440
 441 static void ieee80211_chswitch_timer(unsigned long data)
 442 {
 443         struct ieee80211_sub_if_data *sdata =
 444                 (struct ieee80211_sub_if_data *) data;
 445         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 446
 447         if (sdata->local->quiescing) {
 448                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 449                 return;
 450         }
 451
 452         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 453 }
 454
 455 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 456                                       struct ieee80211_channel_sw_ie *sw_elem,
 457                                       struct ieee80211_bss *bss,
 458                                       u64 timestamp)
 459 {
 460         struct cfg80211_bss *cbss =
 461                 container_of((void *)bss, struct cfg80211_bss, priv);
 462         struct ieee80211_channel *new_ch;
 463         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 464         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 465                                                       cbss->channel->band);
 466
 467         ASSERT_MGD_MTX(ifmgd);
 468
 469         if (!ifmgd->associated)
 470                 return;
 471
 472         if (sdata->local->scanning)
 473                 return;
 474
 475         /* Disregard subsequent beacons if we are already running a timer
 476            processing a CSA */
 477
 478         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 479                 return;
 480
 481         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 482         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 483                 return;
 484
 485         sdata->local->csa_channel = new_ch;
 486
 487         if (sdata->local->ops->channel_switch) {
 488                 /* use driver's channel switch callback */
 489                 struct ieee80211_channel_switch ch_switch;
 490                 memset(&ch_switch, 0, sizeof(ch_switch));
 491                 ch_switch.timestamp = timestamp;
 492                 if (sw_elem->mode) {
 493                         ch_switch.block_tx = true;
 494                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 495                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 496                 }
 497                 ch_switch.channel = new_ch;
 498                 ch_switch.count = sw_elem->count;
 499                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 500                 drv_channel_switch(sdata->local, &ch_switch);
 501                 return;
 502         }
 503
 504         /* channel switch handled in software */
 505         if (sw_elem->count <= 1) {
 506                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 507         } else {
 508                 if (sw_elem->mode)
 509                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 510                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 511                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 512                 mod_timer(&ifmgd->chswitch_timer,
 513                           jiffies +
 514                           msecs_to_jiffies(sw_elem->count *
 515                                            cbss->beacon_interval));
 516         }
 517 }
 518
 519 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 520                                         u16 capab_info, u8 *pwr_constr_elem,
 521                                         u8 pwr_constr_elem_len)
 522 {
 523         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 524
 525         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 526                 return;
 527
 528         /* Power constraint IE length should be 1 octet */
 529         if (pwr_constr_elem_len != 1)
 530                 return;
 531
 532         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 533             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 534                 sdata->local->power_constr_level = *pwr_constr_elem;
 535                 ieee80211_hw_config(sdata->local, 0);
 536         }
 537 }
 538
 539 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 540 {
 541         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 542         struct ieee80211_local *local = sdata->local;
 543         struct ieee80211_conf *conf = &local->hw.conf;
 544
 545         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 546                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 547                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 548
 549         local->disable_dynamic_ps = false;
 550         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 551 }
 552 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 553
 554 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 555 {
 556         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 557         struct ieee80211_local *local = sdata->local;
 558         struct ieee80211_conf *conf = &local->hw.conf;
 559
 560         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 561                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 562                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 563
 564         local->disable_dynamic_ps = true;
 565         conf->dynamic_ps_timeout = 0;
 566         del_timer_sync(&local->dynamic_ps_timer);
 567         ieee80211_queue_work(&local->hw,
 568                              &local->dynamic_ps_enable_work);
 569 }
 570 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 571
 572 /* powersave */
 573 static void ieee80211_enable_ps(struct ieee80211_local *local,
 574                                 struct ieee80211_sub_if_data *sdata)
 575 {
 576         struct ieee80211_conf *conf = &local->hw.conf;
 577
 578         /*
 579          * If we are scanning right now then the parameters will
 580          * take effect when scan finishes.
 581          */
 582         if (local->scanning)
 583                 return;
 584
 585         if (conf->dynamic_ps_timeout > 0 &&
 586             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 587                 mod_timer(&local->dynamic_ps_timer, jiffies +
 588                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 589         } else {
 590                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 591                         ieee80211_send_nullfunc(local, sdata, 1);
 592
 593                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 594                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 595                         return;
 596
 597                 conf->flags |= IEEE80211_CONF_PS;
 598                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 599         }
 600 }
 601
 602 static void ieee80211_change_ps(struct ieee80211_local *local)
 603 {
 604         struct ieee80211_conf *conf = &local->hw.conf;
 605
 606         if (local->ps_sdata) {
 607                 ieee80211_enable_ps(local, local->ps_sdata);
 608         } else if (conf->flags & IEEE80211_CONF_PS) {
 609                 conf->flags &= ~IEEE80211_CONF_PS;
 610                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 611                 del_timer_sync(&local->dynamic_ps_timer);
 612                 cancel_work_sync(&local->dynamic_ps_enable_work);
 613         }
 614 }
 615
 616 /* need to hold RTNL or interface lock */
 617 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 618 {
 619         struct ieee80211_sub_if_data *sdata, *found = NULL;
 620         int count = 0;
 621         int timeout;
 622
 623         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 624                 local->ps_sdata = NULL;
 625                 return;
 626         }
 627
 628         if (!list_empty(&local->work_list)) {
 629                 local->ps_sdata = NULL;
 630                 goto change;
 631         }
 632
 633         list_for_each_entry(sdata, &local->interfaces, list) {
 634                 if (!ieee80211_sdata_running(sdata))
 635                         continue;
 636                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 637                         /* If an AP vif is found, then disable PS
 638                          * by setting the count to zero thereby setting
 639                          * ps_sdata to NULL.
 640                          */
 641                         count = 0;
 642                         break;
 643                 }
 644                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 645                         continue;
 646                 found = sdata;
 647                 count++;
 648         }
 649
 650         if (count == 1 && found->u.mgd.powersave &&
 651             found->u.mgd.associated &&
 652             found->u.mgd.associated->beacon_ies &&
 653             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 654                                     IEEE80211_STA_CONNECTION_POLL))) {
 655                 struct ieee80211_conf *conf = &local->hw.conf;
 656                 s32 beaconint_us;
 657
 658                 if (latency < 0)
 659                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 660
 661                 beaconint_us = ieee80211_tu_to_usec(
 662                                         found->vif.bss_conf.beacon_int);
 663
 664                 timeout = local->dynamic_ps_forced_timeout;
 665                 if (timeout < 0) {
 666                         /*
 667                          * Go to full PSM if the user configures a very low
 668                          * latency requirement.
 669                          * The 2000 second value is there for compatibility
 670                          * until the PM_QOS_NETWORK_LATENCY is configured
 671                          * with real values.
 672                          */
 673                         if (latency > (1900 * USEC_PER_MSEC) &&
 674                             latency != (2000 * USEC_PER_SEC))
 675                                 timeout = 0;
 676                         else
 677                                 timeout = 100;
 678                 }
 679                 local->dynamic_ps_user_timeout = timeout;
 680                 if (!local->disable_dynamic_ps)
 681                         conf->dynamic_ps_timeout =
 682                                 local->dynamic_ps_user_timeout;
 683
 684                 if (beaconint_us > latency) {
 685                         local->ps_sdata = NULL;
 686                 } else {
 687                         struct ieee80211_bss *bss;
 688                         int maxslp = 1;
 689                         u8 dtimper;
 690
 691                         bss = (void *)found->u.mgd.associated->priv;
 692                         dtimper = bss->dtim_period;
 693
 694                         /* If the TIM IE is invalid, pretend the value is 1 */
 695                         if (!dtimper)
 696                                 dtimper = 1;
 697                         else if (dtimper > 1)
 698                                 maxslp = min_t(int, dtimper,
 699                                                     latency / beaconint_us);
 700
 701                         local->hw.conf.max_sleep_period = maxslp;
 702                         local->hw.conf.ps_dtim_period = dtimper;
 703                         local->ps_sdata = found;
 704                 }
 705         } else {
 706                 local->ps_sdata = NULL;
 707         }
 708
 709  change:
 710         ieee80211_change_ps(local);
 711 }
 712
 713 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 714 {
 715         struct ieee80211_local *local =
 716                 container_of(work, struct ieee80211_local,
 717                              dynamic_ps_disable_work);
 718
 719         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 720                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 721                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 722         }
 723
 724         ieee80211_wake_queues_by_reason(&local->hw,
 725                                         IEEE80211_QUEUE_STOP_REASON_PS);
 726 }
 727
 728 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 729 {
 730         struct ieee80211_local *local =
 731                 container_of(work, struct ieee80211_local,
 732                              dynamic_ps_enable_work);
 733         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 734         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 735
 736         /* can only happen when PS was just disabled anyway */
 737         if (!sdata)
 738                 return;
 739
 740         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 741                 return;
 742
 743         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 744             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) {
 745                 netif_tx_stop_all_queues(sdata->dev);
 746                 /*
 747                  * Flush all the frames queued in the driver before
 748                  * going to power save
 749                  */
 750                 drv_flush(local, false);
 751                 ieee80211_send_nullfunc(local, sdata, 1);
 752
 753                 /* Flush once again to get the tx status of nullfunc frame */
 754                 drv_flush(local, false);
 755         }
 756
 757         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 758               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 759             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 760                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 761                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 762                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 763         }
 764
 765         netif_tx_start_all_queues(sdata->dev);
 766 }
 767
 768 void ieee80211_dynamic_ps_timer(unsigned long data)
 769 {
 770         struct ieee80211_local *local = (void *) data;
 771
 772         if (local->quiescing || local->suspended)
 773                 return;
 774
 775         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 776 }
 777
 778 /* MLME */
 779 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 780                                      struct ieee80211_sub_if_data *sdata,
 781                                      u8 *wmm_param, size_t wmm_param_len)
 782 {
 783         struct ieee80211_tx_queue_params params;
 784         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 785         size_t left;
 786         int count;
 787         u8 *pos, uapsd_queues = 0;
 788
 789         if (!local->ops->conf_tx)
 790                 return;
 791
 792         if (local->hw.queues < 4)
 793                 return;
 794
 795         if (!wmm_param)
 796                 return;
 797
 798         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 799                 return;
 800
 801         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 802                 uapsd_queues = local->uapsd_queues;
 803
 804         count = wmm_param[6] & 0x0f;
 805         if (count == ifmgd->wmm_last_param_set)
 806                 return;
 807         ifmgd->wmm_last_param_set = count;
 808
 809         pos = wmm_param + 8;
 810         left = wmm_param_len - 8;
 811
 812         memset(&params, 0, sizeof(params));
 813
 814         local->wmm_acm = 0;
 815         for (; left >= 4; left -= 4, pos += 4) {
 816                 int aci = (pos[0] >> 5) & 0x03;
 817                 int acm = (pos[0] >> 4) & 0x01;
 818                 bool uapsd = false;
 819                 int queue;
 820
 821                 switch (aci) {
 822                 case 1: /* AC_BK */
 823                         queue = 3;
 824                         if (acm)
 825                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 826                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 827                                 uapsd = true;
 828                         break;
 829                 case 2: /* AC_VI */
 830                         queue = 1;
 831                         if (acm)
 832                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 833                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 834                                 uapsd = true;
 835                         break;
 836                 case 3: /* AC_VO */
 837                         queue = 0;
 838                         if (acm)
 839                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 840                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 841                                 uapsd = true;
 842                         break;
 843                 case 0: /* AC_BE */
 844                 default:
 845                         queue = 2;
 846                         if (acm)
 847                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 848                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 849                                 uapsd = true;
 850                         break;
 851                 }
 852
 853                 params.aifs = pos[0] & 0x0f;
 854                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 855                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 856                 params.txop = get_unaligned_le16(pos + 2);
 857                 params.uapsd = uapsd;
 858
 859 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 860                 wiphy_debug(local->hw.wiphy,
 861                             "WMM queue=%d aci=%d acm=%d aifs=%d "
 862                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 863                             queue, aci, acm,
 864                             params.aifs, params.cw_min, params.cw_max,
 865                             params.txop, params.uapsd);
 866 #endif
 867                 if (drv_conf_tx(local, queue, &params))
 868                         wiphy_debug(local->hw.wiphy,
 869                                     "failed to set TX queue parameters for queue %d\n",
 870                                     queue);
 871         }
 872
 873         /* enable WMM or activate new settings */
 874         sdata->vif.bss_conf.qos = true;
 875         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 876 }
 877
 878 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 879                                            u16 capab, bool erp_valid, u8 erp)
 880 {
 881         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 882         u32 changed = 0;
 883         bool use_protection;
 884         bool use_short_preamble;
 885         bool use_short_slot;
 886
 887         if (erp_valid) {
 888                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 889                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 890         } else {
 891                 use_protection = false;
 892                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 893         }
 894
 895         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 896         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 897                 use_short_slot = true;
 898
 899         if (use_protection != bss_conf->use_cts_prot) {
 900                 bss_conf->use_cts_prot = use_protection;
 901                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 902         }
 903
 904         if (use_short_preamble != bss_conf->use_short_preamble) {
 905                 bss_conf->use_short_preamble = use_short_preamble;
 906                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 907         }
 908
 909         if (use_short_slot != bss_conf->use_short_slot) {
 910                 bss_conf->use_short_slot = use_short_slot;
 911                 changed |= BSS_CHANGED_ERP_SLOT;
 912         }
 913
 914         return changed;
 915 }
 916
 917 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 918                                      struct cfg80211_bss *cbss,
 919                                      u32 bss_info_changed)
 920 {
 921         struct ieee80211_bss *bss = (void *)cbss->priv;
 922         struct ieee80211_local *local = sdata->local;
 923         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 924
 925         bss_info_changed |= BSS_CHANGED_ASSOC;
 926         /* set timing information */
 927         bss_conf->beacon_int = cbss->beacon_interval;
 928         bss_conf->timestamp = cbss->tsf;
 929
 930         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 931         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 932                 cbss->capability, bss->has_erp_value, bss->erp_value);
 933
 934         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
 935                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
 936
 937         sdata->u.mgd.associated = cbss;
 938         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 939
 940         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 941
 942         /* just to be sure */
 943         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 944                                 IEEE80211_STA_BEACON_POLL);
 945
 946         ieee80211_led_assoc(local, 1);
 947
 948         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
 949                 bss_conf->dtim_period = bss->dtim_period;
 950         else
 951                 bss_conf->dtim_period = 0;
 952
 953         bss_conf->assoc = 1;
 954         /*
 955          * For now just always ask the driver to update the basic rateset
 956          * when we have associated, we aren't checking whether it actually
 957          * changed or not.
 958          */
 959         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 960
 961         /* And the BSSID changed - we're associated now */
 962         bss_info_changed |= BSS_CHANGED_BSSID;
 963
 964         /* Tell the driver to monitor connection quality (if supported) */
 965         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 966             bss_conf->cqm_rssi_thold)
 967                 bss_info_changed |= BSS_CHANGED_CQM;
 968
 969         /* Enable ARP filtering */
 970         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
 971                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 972                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
 973         }
 974
 975         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 976
 977         mutex_lock(&local->iflist_mtx);
 978         ieee80211_recalc_ps(local, -1);
 979         ieee80211_recalc_smps(local);
 980         mutex_unlock(&local->iflist_mtx);
 981
 982         netif_tx_start_all_queues(sdata->dev);
 983         netif_carrier_on(sdata->dev);
 984 }
 985
 986 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 987                                    bool remove_sta, bool tx)
 988 {
 989         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 990         struct ieee80211_local *local = sdata->local;
 991         struct sta_info *sta;
 992         u32 changed = 0, config_changed = 0;
 993         u8 bssid[ETH_ALEN];
 994
 995         ASSERT_MGD_MTX(ifmgd);
 996
 997         if (WARN_ON(!ifmgd->associated))
 998                 return;
 999
1000         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1001
1002         ifmgd->associated = NULL;
1003         memset(ifmgd->bssid, 0, ETH_ALEN);
1004
1005         /*
1006          * we need to commit the associated = NULL change because the
1007          * scan code uses that to determine whether this iface should
1008          * go to/wake up from powersave or not -- and could otherwise
1009          * wake the queues erroneously.
1010          */
1011         smp_mb();
1012
1013         /*
1014          * Thus, we can only afterwards stop the queues -- to account
1015          * for the case where another CPU is finishing a scan at this
1016          * time -- we don't want the scan code to enable queues.
1017          */
1018
1019         netif_tx_stop_all_queues(sdata->dev);
1020         netif_carrier_off(sdata->dev);
1021
1022         mutex_lock(&local->sta_mtx);
1023         sta = sta_info_get(sdata, bssid);
1024         if (sta) {
1025                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
1026                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1027         }
1028         mutex_unlock(&local->sta_mtx);
1029
1030         changed |= ieee80211_reset_erp_info(sdata);
1031
1032         ieee80211_led_assoc(local, 0);
1033         changed |= BSS_CHANGED_ASSOC;
1034         sdata->vif.bss_conf.assoc = false;
1035
1036         ieee80211_set_wmm_default(sdata);
1037
1038         /* channel(_type) changes are handled by ieee80211_hw_config */
1039         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1040
1041         /* on the next assoc, re-program HT parameters */
1042         sdata->ht_opmode_valid = false;
1043
1044         local->power_constr_level = 0;
1045
1046         del_timer_sync(&local->dynamic_ps_timer);
1047         cancel_work_sync(&local->dynamic_ps_enable_work);
1048
1049         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1050                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1051                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1052         }
1053
1054         ieee80211_hw_config(local, config_changed);
1055
1056         /* Disable ARP filtering */
1057         if (sdata->vif.bss_conf.arp_filter_enabled) {
1058                 sdata->vif.bss_conf.arp_filter_enabled = false;
1059                 changed |= BSS_CHANGED_ARP_FILTER;
1060         }
1061
1062         /* The BSSID (not really interesting) and HT changed */
1063         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1064         ieee80211_bss_info_change_notify(sdata, changed);
1065
1066         if (remove_sta)
1067                 sta_info_destroy_addr(sdata, bssid);
1068
1069         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1070         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1071         del_timer_sync(&sdata->u.mgd.timer);
1072         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1073 }
1074
1075 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1076                              struct ieee80211_hdr *hdr)
1077 {
1078         /*
1079          * We can postpone the mgd.timer whenever receiving unicast frames
1080          * from AP because we know that the connection is working both ways
1081          * at that time. But multicast frames (and hence also beacons) must
1082          * be ignored here, because we need to trigger the timer during
1083          * data idle periods for sending the periodic probe request to the
1084          * AP we're connected to.
1085          */
1086         if (is_multicast_ether_addr(hdr->addr1))
1087                 return;
1088
1089         ieee80211_sta_reset_conn_monitor(sdata);
1090 }
1091
1092 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1093 {
1094         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1095
1096         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1097                               IEEE80211_STA_CONNECTION_POLL)))
1098             return;
1099
1100         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1101                           IEEE80211_STA_BEACON_POLL);
1102         mutex_lock(&sdata->local->iflist_mtx);
1103         ieee80211_recalc_ps(sdata->local, -1);
1104         mutex_unlock(&sdata->local->iflist_mtx);
1105
1106         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1107                 return;
1108
1109         /*
1110          * We've received a probe response, but are not sure whether
1111          * we have or will be receiving any beacons or data, so let's
1112          * schedule the timers again, just in case.
1113          */
1114         ieee80211_sta_reset_beacon_monitor(sdata);
1115
1116         mod_timer(&ifmgd->conn_mon_timer,
1117                   round_jiffies_up(jiffies +
1118                                    IEEE80211_CONNECTION_IDLE_TIME));
1119 }
1120
1121 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1122                              struct ieee80211_hdr *hdr, bool ack)
1123 {
1124         if (!ieee80211_is_data(hdr->frame_control))
1125             return;
1126
1127         if (ack)
1128                 ieee80211_sta_reset_conn_monitor(sdata);
1129
1130         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1131             sdata->u.mgd.probe_send_count > 0) {
1132                 if (ack)
1133                         sdata->u.mgd.probe_send_count = 0;
1134                 else
1135                         sdata->u.mgd.nullfunc_failed = true;
1136                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1137         }
1138 }
1139
1140 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1141 {
1142         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1143         const u8 *ssid;
1144         u8 *dst = ifmgd->associated->bssid;
1145         u8 unicast_limit = max(1, max_probe_tries - 3);
1146
1147         /*
1148          * Try sending broadcast probe requests for the last three
1149          * probe requests after the first ones failed since some
1150          * buggy APs only support broadcast probe requests.
1151          */
1152         if (ifmgd->probe_send_count >= unicast_limit)
1153                 dst = NULL;
1154
1155         /*
1156          * When the hardware reports an accurate Tx ACK status, it's
1157          * better to send a nullfunc frame instead of a probe request,
1158          * as it will kick us off the AP quickly if we aren't associated
1159          * anymore. The timeout will be reset if the frame is ACKed by
1160          * the AP.
1161          */
1162         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1163                 ifmgd->nullfunc_failed = false;
1164                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1165         } else {
1166                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1167                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0);
1168         }
1169
1170         ifmgd->probe_send_count++;
1171         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1172         run_again(ifmgd, ifmgd->probe_timeout);
1173 }
1174
1175 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1176                                    bool beacon)
1177 {
1178         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1179         bool already = false;
1180
1181         if (!ieee80211_sdata_running(sdata))
1182                 return;
1183
1184         if (sdata->local->scanning)
1185                 return;
1186
1187         if (sdata->local->tmp_channel)
1188                 return;
1189
1190         mutex_lock(&ifmgd->mtx);
1191
1192         if (!ifmgd->associated)
1193                 goto out;
1194
1195 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1196         if (beacon && net_ratelimit())
1197                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1198                        "- sending probe request\n", sdata->name);
1199 #endif
1200
1201         /*
1202          * The driver/our work has already reported this event or the
1203          * connection monitoring has kicked in and we have already sent
1204          * a probe request. Or maybe the AP died and the driver keeps
1205          * reporting until we disassociate...
1206          *
1207          * In either case we have to ignore the current call to this
1208          * function (except for setting the correct probe reason bit)
1209          * because otherwise we would reset the timer every time and
1210          * never check whether we received a probe response!
1211          */
1212         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1213                             IEEE80211_STA_CONNECTION_POLL))
1214                 already = true;
1215
1216         if (beacon)
1217                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1218         else
1219                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1220
1221         if (already)
1222                 goto out;
1223
1224         mutex_lock(&sdata->local->iflist_mtx);
1225         ieee80211_recalc_ps(sdata->local, -1);
1226         mutex_unlock(&sdata->local->iflist_mtx);
1227
1228         ifmgd->probe_send_count = 0;
1229         ieee80211_mgd_probe_ap_send(sdata);
1230  out:
1231         mutex_unlock(&ifmgd->mtx);
1232 }
1233
1234 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1235                                           struct ieee80211_vif *vif)
1236 {
1237         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1238         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1239         struct sk_buff *skb;
1240         const u8 *ssid;
1241
1242         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1243                 return NULL;
1244
1245         ASSERT_MGD_MTX(ifmgd);
1246
1247         if (!ifmgd->associated)
1248                 return NULL;
1249
1250         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1251         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1252                                         ssid + 2, ssid[1], NULL, 0);
1253
1254         return skb;
1255 }
1256 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1257
1258 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1259 {
1260         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1261         struct ieee80211_local *local = sdata->local;
1262         u8 bssid[ETH_ALEN];
1263
1264         mutex_lock(&ifmgd->mtx);
1265         if (!ifmgd->associated) {
1266                 mutex_unlock(&ifmgd->mtx);
1267                 return;
1268         }
1269
1270         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1271
1272         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1273                sdata->name, bssid);
1274
1275         ieee80211_set_disassoc(sdata, true, true);
1276         mutex_unlock(&ifmgd->mtx);
1277
1278         mutex_lock(&local->mtx);
1279         ieee80211_recalc_idle(local);
1280         mutex_unlock(&local->mtx);
1281         /*
1282          * must be outside lock due to cfg80211,
1283          * but that's not a problem.
1284          */
1285         ieee80211_send_deauth_disassoc(sdata, bssid,
1286                                        IEEE80211_STYPE_DEAUTH,
1287                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1288                                        NULL, true);
1289 }
1290
1291 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1292 {
1293         struct ieee80211_sub_if_data *sdata =
1294                 container_of(work, struct ieee80211_sub_if_data,
1295                              u.mgd.beacon_connection_loss_work);
1296
1297         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1298                 __ieee80211_connection_loss(sdata);
1299         else
1300                 ieee80211_mgd_probe_ap(sdata, true);
1301 }
1302
1303 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1304 {
1305         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1306         struct ieee80211_hw *hw = &sdata->local->hw;
1307
1308         trace_api_beacon_loss(sdata);
1309
1310         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1311         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1312 }
1313 EXPORT_SYMBOL(ieee80211_beacon_loss);
1314
1315 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1316 {
1317         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1318         struct ieee80211_hw *hw = &sdata->local->hw;
1319
1320         trace_api_connection_loss(sdata);
1321
1322         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1323         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1324 }
1325 EXPORT_SYMBOL(ieee80211_connection_loss);
1326
1327
1328 static enum rx_mgmt_action __must_check
1329 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1330                          struct ieee80211_mgmt *mgmt, size_t len)
1331 {
1332         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1333         const u8 *bssid = NULL;
1334         u16 reason_code;
1335
1336         if (len < 24 + 2)
1337                 return RX_MGMT_NONE;
1338
1339         ASSERT_MGD_MTX(ifmgd);
1340
1341         bssid = ifmgd->associated->bssid;
1342
1343         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1344
1345         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1346                         sdata->name, bssid, reason_code);
1347
1348         ieee80211_set_disassoc(sdata, true, false);
1349         mutex_lock(&sdata->local->mtx);
1350         ieee80211_recalc_idle(sdata->local);
1351         mutex_unlock(&sdata->local->mtx);
1352
1353         return RX_MGMT_CFG80211_DEAUTH;
1354 }
1355
1356
1357 static enum rx_mgmt_action __must_check
1358 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1359                            struct ieee80211_mgmt *mgmt, size_t len)
1360 {
1361         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1362         u16 reason_code;
1363
1364         if (len < 24 + 2)
1365                 return RX_MGMT_NONE;
1366
1367         ASSERT_MGD_MTX(ifmgd);
1368
1369         if (WARN_ON(!ifmgd->associated))
1370                 return RX_MGMT_NONE;
1371
1372         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1373                 return RX_MGMT_NONE;
1374
1375         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1376
1377         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1378                         sdata->name, mgmt->sa, reason_code);
1379
1380         ieee80211_set_disassoc(sdata, true, false);
1381         mutex_lock(&sdata->local->mtx);
1382         ieee80211_recalc_idle(sdata->local);
1383         mutex_unlock(&sdata->local->mtx);
1384         return RX_MGMT_CFG80211_DISASSOC;
1385 }
1386
1387
1388 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1389                                     struct ieee80211_mgmt *mgmt, size_t len)
1390 {
1391         struct ieee80211_sub_if_data *sdata = wk->sdata;
1392         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1393         struct ieee80211_local *local = sdata->local;
1394         struct ieee80211_supported_band *sband;
1395         struct sta_info *sta;
1396         struct cfg80211_bss *cbss = wk->assoc.bss;
1397         u8 *pos;
1398         u32 rates, basic_rates;
1399         u16 capab_info, aid;
1400         struct ieee802_11_elems elems;
1401         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1402         u32 changed = 0;
1403         int i, j, err;
1404         bool have_higher_than_11mbit = false;
1405         u16 ap_ht_cap_flags;
1406
1407         /* AssocResp and ReassocResp have identical structure */
1408
1409         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1410         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1411
1412         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1413                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1414                        "set\n", sdata->name, aid);
1415         aid &= ~(BIT(15) | BIT(14));
1416
1417         pos = mgmt->u.assoc_resp.variable;
1418         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1419
1420         if (!elems.supp_rates) {
1421                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1422                        sdata->name);
1423                 return false;
1424         }
1425
1426         ifmgd->aid = aid;
1427
1428         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1429         if (!sta) {
1430                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1431                        " the AP\n", sdata->name);
1432                 return false;
1433         }
1434
1435         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1436                            WLAN_STA_ASSOC_AP);
1437         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1438                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1439
1440         rates = 0;
1441         basic_rates = 0;
1442         sband = local->hw.wiphy->bands[wk->chan->band];
1443
1444         for (i = 0; i < elems.supp_rates_len; i++) {
1445                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1446                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1447
1448                 if (rate > 110)
1449                         have_higher_than_11mbit = true;
1450
1451                 for (j = 0; j < sband->n_bitrates; j++) {
1452                         if (sband->bitrates[j].bitrate == rate) {
1453                                 rates |= BIT(j);
1454                                 if (is_basic)
1455                                         basic_rates |= BIT(j);
1456                                 break;
1457                         }
1458                 }
1459         }
1460
1461         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1462                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1463                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1464
1465                 if (rate > 110)
1466                         have_higher_than_11mbit = true;
1467
1468                 for (j = 0; j < sband->n_bitrates; j++) {
1469                         if (sband->bitrates[j].bitrate == rate) {
1470                                 rates |= BIT(j);
1471                                 if (is_basic)
1472                                         basic_rates |= BIT(j);
1473                                 break;
1474                         }
1475                 }
1476         }
1477
1478         sta->sta.supp_rates[wk->chan->band] = rates;
1479         sdata->vif.bss_conf.basic_rates = basic_rates;
1480
1481         /* cf. IEEE 802.11 9.2.12 */
1482         if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1483             have_higher_than_11mbit)
1484                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1485         else
1486                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1487
1488         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1489                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1490                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1491
1492         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1493
1494         rate_control_rate_init(sta);
1495
1496         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1497                 set_sta_flags(sta, WLAN_STA_MFP);
1498
1499         if (elems.wmm_param)
1500                 set_sta_flags(sta, WLAN_STA_WME);
1501
1502         err = sta_info_insert(sta);
1503         sta = NULL;
1504         if (err) {
1505                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1506                        " the AP (error %d)\n", sdata->name, err);
1507                 return false;
1508         }
1509
1510         /*
1511          * Always handle WMM once after association regardless
1512          * of the first value the AP uses. Setting -1 here has
1513          * that effect because the AP values is an unsigned
1514          * 4-bit value.
1515          */
1516         ifmgd->wmm_last_param_set = -1;
1517
1518         if (elems.wmm_param)
1519                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1520                                          elems.wmm_param_len);
1521         else
1522                 ieee80211_set_wmm_default(sdata);
1523
1524         local->oper_channel = wk->chan;
1525
1526         if (elems.ht_info_elem && elems.wmm_param &&
1527             (sdata->local->hw.queues >= 4) &&
1528             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1529                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1530                                                cbss->bssid, ap_ht_cap_flags);
1531
1532         /* set AID and assoc capability,
1533          * ieee80211_set_associated() will tell the driver */
1534         bss_conf->aid = aid;
1535         bss_conf->assoc_capability = capab_info;
1536         ieee80211_set_associated(sdata, cbss, changed);
1537
1538         /*
1539          * If we're using 4-addr mode, let the AP know that we're
1540          * doing so, so that it can create the STA VLAN on its side
1541          */
1542         if (ifmgd->use_4addr)
1543                 ieee80211_send_4addr_nullfunc(local, sdata);
1544
1545         /*
1546          * Start timer to probe the connection to the AP now.
1547          * Also start the timer that will detect beacon loss.
1548          */
1549         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1550         ieee80211_sta_reset_beacon_monitor(sdata);
1551
1552         return true;
1553 }
1554
1555
1556 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1557                                   struct ieee80211_mgmt *mgmt,
1558                                   size_t len,
1559                                   struct ieee80211_rx_status *rx_status,
1560                                   struct ieee802_11_elems *elems,
1561                                   bool beacon)
1562 {
1563         struct ieee80211_local *local = sdata->local;
1564         int freq;
1565         struct ieee80211_bss *bss;
1566         struct ieee80211_channel *channel;
1567         bool need_ps = false;
1568
1569         if (sdata->u.mgd.associated) {
1570                 bss = (void *)sdata->u.mgd.associated->priv;
1571                 /* not previously set so we may need to recalc */
1572                 need_ps = !bss->dtim_period;
1573         }
1574
1575         if (elems->ds_params && elems->ds_params_len == 1)
1576                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1577                                                       rx_status->band);
1578         else
1579                 freq = rx_status->freq;
1580
1581         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1582
1583         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1584                 return;
1585
1586         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1587                                         channel, beacon);
1588         if (bss)
1589                 ieee80211_rx_bss_put(local, bss);
1590
1591         if (!sdata->u.mgd.associated)
1592                 return;
1593
1594         if (need_ps) {
1595                 mutex_lock(&local->iflist_mtx);
1596                 ieee80211_recalc_ps(local, -1);
1597                 mutex_unlock(&local->iflist_mtx);
1598         }
1599
1600         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1601             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1602                                                         ETH_ALEN) == 0)) {
1603                 struct ieee80211_channel_sw_ie *sw_elem =
1604                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1605                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1606                                                  bss, rx_status->mactime);
1607         }
1608 }
1609
1610
1611 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1612                                          struct sk_buff *skb)
1613 {
1614         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1615         struct ieee80211_if_managed *ifmgd;
1616         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1617         size_t baselen, len = skb->len;
1618         struct ieee802_11_elems elems;
1619
1620         ifmgd = &sdata->u.mgd;
1621
1622         ASSERT_MGD_MTX(ifmgd);
1623
1624         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1625                 return; /* ignore ProbeResp to foreign address */
1626
1627         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1628         if (baselen > len)
1629                 return;
1630
1631         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1632                                 &elems);
1633
1634         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1635
1636         if (ifmgd->associated &&
1637             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1638                 ieee80211_reset_ap_probe(sdata);
1639 }
1640
1641 /*
1642  * This is the canonical list of information elements we care about,
1643  * the filter code also gives us all changes to the Microsoft OUI
1644  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1645  *
1646  * We implement beacon filtering in software since that means we can
1647  * avoid processing the frame here and in cfg80211, and userspace
1648  * will not be able to tell whether the hardware supports it or not.
1649  *
1650  * XXX: This list needs to be dynamic -- userspace needs to be able to
1651  *      add items it requires. It also needs to be able to tell us to
1652  *      look out for other vendor IEs.
1653  */
1654 static const u64 care_about_ies =
1655         (1ULL << WLAN_EID_COUNTRY) |
1656         (1ULL << WLAN_EID_ERP_INFO) |
1657         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1658         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1659         (1ULL << WLAN_EID_HT_CAPABILITY) |
1660         (1ULL << WLAN_EID_HT_INFORMATION);
1661
1662 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1663                                      struct ieee80211_mgmt *mgmt,
1664                                      size_t len,
1665                                      struct ieee80211_rx_status *rx_status)
1666 {
1667         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1668         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1669         size_t baselen;
1670         struct ieee802_11_elems elems;
1671         struct ieee80211_local *local = sdata->local;
1672         u32 changed = 0;
1673         bool erp_valid, directed_tim = false;
1674         u8 erp_value = 0;
1675         u32 ncrc;
1676         u8 *bssid;
1677
1678         ASSERT_MGD_MTX(ifmgd);
1679
1680         /* Process beacon from the current BSS */
1681         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1682         if (baselen > len)
1683                 return;
1684
1685         if (rx_status->freq != local->hw.conf.channel->center_freq)
1686                 return;
1687
1688         /*
1689          * We might have received a number of frames, among them a
1690          * disassoc frame and a beacon...
1691          */
1692         if (!ifmgd->associated)
1693                 return;
1694
1695         bssid = ifmgd->associated->bssid;
1696
1697         /*
1698          * And in theory even frames from a different AP we were just
1699          * associated to a split-second ago!
1700          */
1701         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1702                 return;
1703
1704         /* Track average RSSI from the Beacon frames of the current AP */
1705         ifmgd->last_beacon_signal = rx_status->signal;
1706         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1707                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1708                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1709                 ifmgd->last_cqm_event_signal = 0;
1710                 ifmgd->count_beacon_signal = 1;
1711         } else {
1712                 ifmgd->ave_beacon_signal =
1713                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1714                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1715                          ifmgd->ave_beacon_signal) / 16;
1716                 ifmgd->count_beacon_signal++;
1717         }
1718         if (bss_conf->cqm_rssi_thold &&
1719             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1720             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1721                 int sig = ifmgd->ave_beacon_signal / 16;
1722                 int last_event = ifmgd->last_cqm_event_signal;
1723                 int thold = bss_conf->cqm_rssi_thold;
1724                 int hyst = bss_conf->cqm_rssi_hyst;
1725                 if (sig < thold &&
1726                     (last_event == 0 || sig < last_event - hyst)) {
1727                         ifmgd->last_cqm_event_signal = sig;
1728                         ieee80211_cqm_rssi_notify(
1729                                 &sdata->vif,
1730                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1731                                 GFP_KERNEL);
1732                 } else if (sig > thold &&
1733                            (last_event == 0 || sig > last_event + hyst)) {
1734                         ifmgd->last_cqm_event_signal = sig;
1735                         ieee80211_cqm_rssi_notify(
1736                                 &sdata->vif,
1737                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1738                                 GFP_KERNEL);
1739                 }
1740         }
1741
1742         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1743 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1744                 if (net_ratelimit()) {
1745                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1746                                "to a received beacon\n", sdata->name);
1747                 }
1748 #endif
1749                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1750                 mutex_lock(&local->iflist_mtx);
1751                 ieee80211_recalc_ps(local, -1);
1752                 mutex_unlock(&local->iflist_mtx);
1753         }
1754
1755         /*
1756          * Push the beacon loss detection into the future since
1757          * we are processing a beacon from the AP just now.
1758          */
1759         ieee80211_sta_reset_beacon_monitor(sdata);
1760
1761         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1762         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1763                                           len - baselen, &elems,
1764                                           care_about_ies, ncrc);
1765
1766         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1767                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1768                                                    ifmgd->aid);
1769
1770         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1771                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1772                                       true);
1773
1774                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1775                                          elems.wmm_param_len);
1776         }
1777
1778         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1779                 if (directed_tim) {
1780                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1781                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1782                                 ieee80211_hw_config(local,
1783                                                     IEEE80211_CONF_CHANGE_PS);
1784                                 ieee80211_send_nullfunc(local, sdata, 0);
1785                         } else {
1786                                 local->pspolling = true;
1787
1788                                 /*
1789                                  * Here is assumed that the driver will be
1790                                  * able to send ps-poll frame and receive a
1791                                  * response even though power save mode is
1792                                  * enabled, but some drivers might require
1793                                  * to disable power save here. This needs
1794                                  * to be investigated.
1795                                  */
1796                                 ieee80211_send_pspoll(local, sdata);
1797                         }
1798                 }
1799         }
1800
1801         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1802                 return;
1803         ifmgd->beacon_crc = ncrc;
1804         ifmgd->beacon_crc_valid = true;
1805
1806         if (elems.erp_info && elems.erp_info_len >= 1) {
1807                 erp_valid = true;
1808                 erp_value = elems.erp_info[0];
1809         } else {
1810                 erp_valid = false;
1811         }
1812         changed |= ieee80211_handle_bss_capability(sdata,
1813                         le16_to_cpu(mgmt->u.beacon.capab_info),
1814                         erp_valid, erp_value);
1815
1816
1817         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1818             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1819                 struct sta_info *sta;
1820                 struct ieee80211_supported_band *sband;
1821                 u16 ap_ht_cap_flags;
1822
1823                 rcu_read_lock();
1824
1825                 sta = sta_info_get(sdata, bssid);
1826                 if (WARN_ON(!sta)) {
1827                         rcu_read_unlock();
1828                         return;
1829                 }
1830
1831                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1832
1833                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1834                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1835
1836                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1837
1838                 rcu_read_unlock();
1839
1840                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1841                                                bssid, ap_ht_cap_flags);
1842         }
1843
1844         /* Note: country IE parsing is done for us by cfg80211 */
1845         if (elems.country_elem) {
1846                 /* TODO: IBSS also needs this */
1847                 if (elems.pwr_constr_elem)
1848                         ieee80211_handle_pwr_constr(sdata,
1849                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1850                                 elems.pwr_constr_elem,
1851                                 elems.pwr_constr_elem_len);
1852         }
1853
1854         ieee80211_bss_info_change_notify(sdata, changed);
1855 }
1856
1857 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1858                                   struct sk_buff *skb)
1859 {
1860         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1861         struct ieee80211_rx_status *rx_status;
1862         struct ieee80211_mgmt *mgmt;
1863         enum rx_mgmt_action rma = RX_MGMT_NONE;
1864         u16 fc;
1865
1866         rx_status = (struct ieee80211_rx_status *) skb->cb;
1867         mgmt = (struct ieee80211_mgmt *) skb->data;
1868         fc = le16_to_cpu(mgmt->frame_control);
1869
1870         mutex_lock(&ifmgd->mtx);
1871
1872         if (ifmgd->associated &&
1873             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1874                 switch (fc & IEEE80211_FCTL_STYPE) {
1875                 case IEEE80211_STYPE_BEACON:
1876                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1877                                                  rx_status);
1878                         break;
1879                 case IEEE80211_STYPE_PROBE_RESP:
1880                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1881                         break;
1882                 case IEEE80211_STYPE_DEAUTH:
1883                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1884                         break;
1885                 case IEEE80211_STYPE_DISASSOC:
1886                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1887                         break;
1888                 case IEEE80211_STYPE_ACTION:
1889                         switch (mgmt->u.action.category) {
1890                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1891                                 ieee80211_sta_process_chanswitch(sdata,
1892                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1893                                                 (void *)ifmgd->associated->priv,
1894                                                 rx_status->mactime);
1895                                 break;
1896                         }
1897                 }
1898                 mutex_unlock(&ifmgd->mtx);
1899
1900                 switch (rma) {
1901                 case RX_MGMT_NONE:
1902                         /* no action */
1903                         break;
1904                 case RX_MGMT_CFG80211_DEAUTH:
1905                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1906                         break;
1907                 case RX_MGMT_CFG80211_DISASSOC:
1908                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1909                         break;
1910                 default:
1911                         WARN(1, "unexpected: %d", rma);
1912                 }
1913                 return;
1914         }
1915
1916         mutex_unlock(&ifmgd->mtx);
1917
1918         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1919             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1920                 struct ieee80211_local *local = sdata->local;
1921                 struct ieee80211_work *wk;
1922
1923                 mutex_lock(&local->mtx);
1924                 list_for_each_entry(wk, &local->work_list, list) {
1925                         if (wk->sdata != sdata)
1926                                 continue;
1927
1928                         if (wk->type != IEEE80211_WORK_ASSOC &&
1929                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1930                                 continue;
1931
1932                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1933                                 continue;
1934                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1935                                 continue;
1936
1937                         /*
1938                          * Printing the message only here means we can't
1939                          * spuriously print it, but it also means that it
1940                          * won't be printed when the frame comes in before
1941                          * we even tried to associate or in similar cases.
1942                          *
1943                          * Ultimately, I suspect cfg80211 should print the
1944                          * messages instead.
1945                          */
1946                         printk(KERN_DEBUG
1947                                "%s: deauthenticated from %pM (Reason: %u)\n",
1948                                sdata->name, mgmt->bssid,
1949                                le16_to_cpu(mgmt->u.deauth.reason_code));
1950
1951                         list_del_rcu(&wk->list);
1952                         free_work(wk);
1953                         break;
1954                 }
1955                 mutex_unlock(&local->mtx);
1956
1957                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1958         }
1959 }
1960
1961 static void ieee80211_sta_timer(unsigned long data)
1962 {
1963         struct ieee80211_sub_if_data *sdata =
1964                 (struct ieee80211_sub_if_data *) data;
1965         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1966         struct ieee80211_local *local = sdata->local;
1967
1968         if (local->quiescing) {
1969                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1970                 return;
1971         }
1972
1973         ieee80211_queue_work(&local->hw, &sdata->work);
1974 }
1975
1976 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
1977                                           u8 *bssid)
1978 {
1979         struct ieee80211_local *local = sdata->local;
1980         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1981
1982         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1983                           IEEE80211_STA_BEACON_POLL);
1984
1985         ieee80211_set_disassoc(sdata, true, true);
1986         mutex_unlock(&ifmgd->mtx);
1987         mutex_lock(&local->mtx);
1988         ieee80211_recalc_idle(local);
1989         mutex_unlock(&local->mtx);
1990         /*
1991          * must be outside lock due to cfg80211,
1992          * but that's not a problem.
1993          */
1994         ieee80211_send_deauth_disassoc(sdata, bssid,
1995                         IEEE80211_STYPE_DEAUTH,
1996                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1997                         NULL, true);
1998         mutex_lock(&ifmgd->mtx);
1999 }
2000
2001 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2002 {
2003         struct ieee80211_local *local = sdata->local;
2004         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2005
2006         /* then process the rest of the work */
2007         mutex_lock(&ifmgd->mtx);
2008
2009         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2010                             IEEE80211_STA_CONNECTION_POLL) &&
2011             ifmgd->associated) {
2012                 u8 bssid[ETH_ALEN];
2013                 int max_tries;
2014
2015                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2016
2017                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2018                         max_tries = max_nullfunc_tries;
2019                 else
2020                         max_tries = max_probe_tries;
2021
2022                 /* ACK received for nullfunc probing frame */
2023                 if (!ifmgd->probe_send_count)
2024                         ieee80211_reset_ap_probe(sdata);
2025                 else if (ifmgd->nullfunc_failed) {
2026                         if (ifmgd->probe_send_count < max_tries) {
2027 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2028                                 wiphy_debug(local->hw.wiphy,
2029                                             "%s: No ack for nullfunc frame to"
2030                                             " AP %pM, try %d/%i\n",
2031                                             sdata->name, bssid,
2032                                             ifmgd->probe_send_count, max_tries);
2033 #endif
2034                                 ieee80211_mgd_probe_ap_send(sdata);
2035                         } else {
2036 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2037                                 wiphy_debug(local->hw.wiphy,
2038                                             "%s: No ack for nullfunc frame to"
2039                                             " AP %pM, disconnecting.\n",
2040                                             sdata->name, bssid);
2041 #endif
2042                                 ieee80211_sta_connection_lost(sdata, bssid);
2043                         }
2044                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2045                         run_again(ifmgd, ifmgd->probe_timeout);
2046                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2047 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2048                         wiphy_debug(local->hw.wiphy,
2049                                     "%s: Failed to send nullfunc to AP %pM"
2050                                     " after %dms, disconnecting.\n",
2051                                     sdata->name,
2052                                     bssid, probe_wait_ms);
2053 #endif
2054                         ieee80211_sta_connection_lost(sdata, bssid);
2055                 } else if (ifmgd->probe_send_count < max_tries) {
2056 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2057                         wiphy_debug(local->hw.wiphy,
2058                                     "%s: No probe response from AP %pM"
2059                                     " after %dms, try %d/%i\n",
2060                                     sdata->name,
2061                                     bssid, probe_wait_ms,
2062                                     ifmgd->probe_send_count, max_tries);
2063 #endif
2064                         ieee80211_mgd_probe_ap_send(sdata);
2065                 } else {
2066                         /*
2067                          * We actually lost the connection ... or did we?
2068                          * Let's make sure!
2069                          */
2070                         wiphy_debug(local->hw.wiphy,
2071                                     "%s: No probe response from AP %pM"
2072                                     " after %dms, disconnecting.\n",
2073                                     sdata->name,
2074                                     bssid, probe_wait_ms);
2075
2076                         ieee80211_sta_connection_lost(sdata, bssid);
2077                 }
2078         }
2079
2080         mutex_unlock(&ifmgd->mtx);
2081 }
2082
2083 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2084 {
2085         struct ieee80211_sub_if_data *sdata =
2086                 (struct ieee80211_sub_if_data *) data;
2087         struct ieee80211_local *local = sdata->local;
2088
2089         if (local->quiescing)
2090                 return;
2091
2092         ieee80211_queue_work(&sdata->local->hw,
2093                              &sdata->u.mgd.beacon_connection_loss_work);
2094 }
2095
2096 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2097 {
2098         struct ieee80211_sub_if_data *sdata =
2099                 (struct ieee80211_sub_if_data *) data;
2100         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2101         struct ieee80211_local *local = sdata->local;
2102
2103         if (local->quiescing)
2104                 return;
2105
2106         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2107 }
2108
2109 static void ieee80211_sta_monitor_work(struct work_struct *work)
2110 {
2111         struct ieee80211_sub_if_data *sdata =
2112                 container_of(work, struct ieee80211_sub_if_data,
2113                              u.mgd.monitor_work);
2114
2115         ieee80211_mgd_probe_ap(sdata, false);
2116 }
2117
2118 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2119 {
2120         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2121                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2122                                         IEEE80211_STA_CONNECTION_POLL);
2123
2124                 /* let's probe the connection once */
2125                 ieee80211_queue_work(&sdata->local->hw,
2126                            &sdata->u.mgd.monitor_work);
2127                 /* and do all the other regular work too */
2128                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2129         }
2130 }
2131
2132 #ifdef CONFIG_PM
2133 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2134 {
2135         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2136
2137         /*
2138          * we need to use atomic bitops for the running bits
2139          * only because both timers might fire at the same
2140          * time -- the code here is properly synchronised.
2141          */
2142
2143         cancel_work_sync(&ifmgd->request_smps_work);
2144
2145         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2146         if (del_timer_sync(&ifmgd->timer))
2147                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2148
2149         cancel_work_sync(&ifmgd->chswitch_work);
2150         if (del_timer_sync(&ifmgd->chswitch_timer))
2151                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2152
2153         cancel_work_sync(&ifmgd->monitor_work);
2154         /* these will just be re-established on connection */
2155         del_timer_sync(&ifmgd->conn_mon_timer);
2156         del_timer_sync(&ifmgd->bcn_mon_timer);
2157 }
2158
2159 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2160 {
2161         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2162
2163         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2164                 add_timer(&ifmgd->timer);
2165         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2166                 add_timer(&ifmgd->chswitch_timer);
2167         ieee80211_sta_reset_beacon_monitor(sdata);
2168         ieee80211_restart_sta_timer(sdata);
2169 }
2170 #endif
2171
2172 /* interface setup */
2173 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2174 {
2175         struct ieee80211_if_managed *ifmgd;
2176
2177         ifmgd = &sdata->u.mgd;
2178         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2179         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2180         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2181                   ieee80211_beacon_connection_loss_work);
2182         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2183         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2184                     (unsigned long) sdata);
2185         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2186                     (unsigned long) sdata);
2187         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2188                     (unsigned long) sdata);
2189         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2190                     (unsigned long) sdata);
2191
2192         ifmgd->flags = 0;
2193
2194         mutex_init(&ifmgd->mtx);
2195
2196         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2197                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2198         else
2199                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2200 }
2201
2202 /* scan finished notification */
2203 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2204 {
2205         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2206
2207         /* Restart STA timers */
2208         rcu_read_lock();
2209         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2210                 ieee80211_restart_sta_timer(sdata);
2211         rcu_read_unlock();
2212 }
2213
2214 int ieee80211_max_network_latency(struct notifier_block *nb,
2215                                   unsigned long data, void *dummy)
2216 {
2217         s32 latency_usec = (s32) data;
2218         struct ieee80211_local *local =
2219                 container_of(nb, struct ieee80211_local,
2220                              network_latency_notifier);
2221
2222         mutex_lock(&local->iflist_mtx);
2223         ieee80211_recalc_ps(local, latency_usec);
2224         mutex_unlock(&local->iflist_mtx);
2225
2226         return 0;
2227 }
2228
2229 /* config hooks */
2230 static enum work_done_result
2231 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2232                           struct sk_buff *skb)
2233 {
2234         if (!skb) {
2235                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2236                 return WORK_DONE_DESTROY;
2237         }
2238
2239         if (wk->type == IEEE80211_WORK_AUTH) {
2240                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2241                 return WORK_DONE_DESTROY;
2242         }
2243
2244         mutex_lock(&wk->sdata->u.mgd.mtx);
2245         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2246         mutex_unlock(&wk->sdata->u.mgd.mtx);
2247
2248         wk->type = IEEE80211_WORK_AUTH;
2249         wk->probe_auth.tries = 0;
2250         return WORK_DONE_REQUEUE;
2251 }
2252
2253 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2254                        struct cfg80211_auth_request *req)
2255 {
2256         const u8 *ssid;
2257         struct ieee80211_work *wk;
2258         u16 auth_alg;
2259
2260         if (req->local_state_change)
2261                 return 0; /* no need to update mac80211 state */
2262
2263         switch (req->auth_type) {
2264         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2265                 auth_alg = WLAN_AUTH_OPEN;
2266                 break;
2267         case NL80211_AUTHTYPE_SHARED_KEY:
2268                 if (IS_ERR(sdata->local->wep_tx_tfm))
2269                         return -EOPNOTSUPP;
2270                 auth_alg = WLAN_AUTH_SHARED_KEY;
2271                 break;
2272         case NL80211_AUTHTYPE_FT:
2273                 auth_alg = WLAN_AUTH_FT;
2274                 break;
2275         case NL80211_AUTHTYPE_NETWORK_EAP:
2276                 auth_alg = WLAN_AUTH_LEAP;
2277                 break;
2278         default:
2279                 return -EOPNOTSUPP;
2280         }
2281
2282         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2283         if (!wk)
2284                 return -ENOMEM;
2285
2286         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2287
2288         if (req->ie && req->ie_len) {
2289                 memcpy(wk->ie, req->ie, req->ie_len);
2290                 wk->ie_len = req->ie_len;
2291         }
2292
2293         if (req->key && req->key_len) {
2294                 wk->probe_auth.key_len = req->key_len;
2295                 wk->probe_auth.key_idx = req->key_idx;
2296                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2297         }
2298
2299         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2300         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2301         wk->probe_auth.ssid_len = ssid[1];
2302
2303         wk->probe_auth.algorithm = auth_alg;
2304         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2305
2306         /* if we already have a probe, don't probe again */
2307         if (req->bss->proberesp_ies)
2308                 wk->type = IEEE80211_WORK_AUTH;
2309         else
2310                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2311         wk->chan = req->bss->channel;
2312         wk->chan_type = NL80211_CHAN_NO_HT;
2313         wk->sdata = sdata;
2314         wk->done = ieee80211_probe_auth_done;
2315
2316         ieee80211_add_work(wk);
2317         return 0;
2318 }
2319
2320 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2321                                                   struct sk_buff *skb)
2322 {
2323         struct ieee80211_mgmt *mgmt;
2324         struct ieee80211_rx_status *rx_status;
2325         struct ieee802_11_elems elems;
2326         u16 status;
2327
2328         if (!skb) {
2329                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2330                 return WORK_DONE_DESTROY;
2331         }
2332
2333         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2334                 mutex_lock(&wk->sdata->u.mgd.mtx);
2335                 rx_status = (void *) skb->cb;
2336                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2337                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2338                                       &elems, true);
2339                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2340
2341                 wk->type = IEEE80211_WORK_ASSOC;
2342                 /* not really done yet */
2343                 return WORK_DONE_REQUEUE;
2344         }
2345
2346         mgmt = (void *)skb->data;
2347         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2348
2349         if (status == WLAN_STATUS_SUCCESS) {
2350                 mutex_lock(&wk->sdata->u.mgd.mtx);
2351                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2352                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2353                         /* oops -- internal error -- send timeout for now */
2354                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2355                                                     wk->filter_ta);
2356                         return WORK_DONE_DESTROY;
2357                 }
2358
2359                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2360         }
2361
2362         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2363         return WORK_DONE_DESTROY;
2364 }
2365
2366 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2367                         struct cfg80211_assoc_request *req)
2368 {
2369         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2370         struct ieee80211_bss *bss = (void *)req->bss->priv;
2371         struct ieee80211_work *wk;
2372         const u8 *ssid;
2373         int i;
2374
2375         mutex_lock(&ifmgd->mtx);
2376         if (ifmgd->associated) {
2377                 if (!req->prev_bssid ||
2378                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2379                            ETH_ALEN)) {
2380                         /*
2381                          * We are already associated and the request was not a
2382                          * reassociation request from the current BSS, so
2383                          * reject it.
2384                          */
2385                         mutex_unlock(&ifmgd->mtx);
2386                         return -EALREADY;
2387                 }
2388
2389                 /* Trying to reassociate - clear previous association state */
2390                 ieee80211_set_disassoc(sdata, true, false);
2391         }
2392         mutex_unlock(&ifmgd->mtx);
2393
2394         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2395         if (!wk)
2396                 return -ENOMEM;
2397
2398         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2399         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2400
2401         ifmgd->beacon_crc_valid = false;
2402
2403         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2404                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2405                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2406                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2407                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2408
2409
2410         if (req->ie && req->ie_len) {
2411                 memcpy(wk->ie, req->ie, req->ie_len);
2412                 wk->ie_len = req->ie_len;
2413         } else
2414                 wk->ie_len = 0;
2415
2416         wk->assoc.bss = req->bss;
2417
2418         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2419
2420         /* new association always uses requested smps mode */
2421         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2422                 if (ifmgd->powersave)
2423                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2424                 else
2425                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2426         } else
2427                 ifmgd->ap_smps = ifmgd->req_smps;
2428
2429         wk->assoc.smps = ifmgd->ap_smps;
2430         /*
2431          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2432          * We still associate in non-HT mode (11a/b/g) if any one of these
2433          * ciphers is configured as pairwise.
2434          * We can set this to true for non-11n hardware, that'll be checked
2435          * separately along with the peer capabilities.
2436          */
2437         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2438         wk->assoc.capability = req->bss->capability;
2439         wk->assoc.wmm_used = bss->wmm_used;
2440         wk->assoc.supp_rates = bss->supp_rates;
2441         wk->assoc.supp_rates_len = bss->supp_rates_len;
2442         wk->assoc.ht_information_ie =
2443                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2444
2445         if (bss->wmm_used && bss->uapsd_supported &&
2446             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2447                 wk->assoc.uapsd_used = true;
2448                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2449         } else {
2450                 wk->assoc.uapsd_used = false;
2451                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2452         }
2453
2454         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2455         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2456         wk->assoc.ssid_len = ssid[1];
2457
2458         if (req->prev_bssid)
2459                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2460
2461         wk->chan = req->bss->channel;
2462         wk->chan_type = NL80211_CHAN_NO_HT;
2463         wk->sdata = sdata;
2464         wk->done = ieee80211_assoc_done;
2465         if (!bss->dtim_period &&
2466             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2467                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2468         else
2469                 wk->type = IEEE80211_WORK_ASSOC;
2470
2471         if (req->use_mfp) {
2472                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2473                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2474         } else {
2475                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2476                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2477         }
2478
2479         if (req->crypto.control_port)
2480                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2481         else
2482                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2483
2484         sdata->control_port_protocol = req->crypto.control_port_ethertype;
2485         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2486
2487         ieee80211_add_work(wk);
2488         return 0;
2489 }
2490
2491 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2492                          struct cfg80211_deauth_request *req,
2493                          void *cookie)
2494 {
2495         struct ieee80211_local *local = sdata->local;
2496         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2497         struct ieee80211_work *wk;
2498         u8 bssid[ETH_ALEN];
2499         bool assoc_bss = false;
2500
2501         mutex_lock(&ifmgd->mtx);
2502
2503         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2504         if (ifmgd->associated == req->bss) {
2505                 ieee80211_set_disassoc(sdata, false, true);
2506                 mutex_unlock(&ifmgd->mtx);
2507                 assoc_bss = true;
2508         } else {
2509                 bool not_auth_yet = false;
2510
2511                 mutex_unlock(&ifmgd->mtx);
2512
2513                 mutex_lock(&local->mtx);
2514                 list_for_each_entry(wk, &local->work_list, list) {
2515                         if (wk->sdata != sdata)
2516                                 continue;
2517
2518                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2519                             wk->type != IEEE80211_WORK_AUTH &&
2520                             wk->type != IEEE80211_WORK_ASSOC &&
2521                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2522                                 continue;
2523
2524                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2525                                 continue;
2526
2527                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2528                         list_del_rcu(&wk->list);
2529                         free_work(wk);
2530                         break;
2531                 }
2532                 mutex_unlock(&local->mtx);
2533
2534                 /*
2535                  * If somebody requests authentication and we haven't
2536                  * sent out an auth frame yet there's no need to send
2537                  * out a deauth frame either. If the state was PROBE,
2538                  * then this is the case. If it's AUTH we have sent a
2539                  * frame, and if it's IDLE we have completed the auth
2540                  * process already.
2541                  */
2542                 if (not_auth_yet) {
2543                         __cfg80211_auth_canceled(sdata->dev, bssid);
2544                         return 0;
2545                 }
2546         }
2547
2548         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2549                sdata->name, bssid, req->reason_code);
2550
2551         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2552                                        req->reason_code, cookie,
2553                                        !req->local_state_change);
2554         if (assoc_bss)
2555                 sta_info_destroy_addr(sdata, bssid);
2556
2557         mutex_lock(&sdata->local->mtx);
2558         ieee80211_recalc_idle(sdata->local);
2559         mutex_unlock(&sdata->local->mtx);
2560
2561         return 0;
2562 }
2563
2564 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2565                            struct cfg80211_disassoc_request *req,
2566                            void *cookie)
2567 {
2568         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2569         u8 bssid[ETH_ALEN];
2570
2571         mutex_lock(&ifmgd->mtx);
2572
2573         /*
2574          * cfg80211 should catch this ... but it's racy since
2575          * we can receive a disassoc frame, process it, hand it
2576          * to cfg80211 while that's in a locked section already
2577          * trying to tell us that the user wants to disconnect.
2578          */
2579         if (ifmgd->associated != req->bss) {
2580                 mutex_unlock(&ifmgd->mtx);
2581                 return -ENOLINK;
2582         }
2583
2584         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2585                sdata->name, req->bss->bssid, req->reason_code);
2586
2587         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2588         ieee80211_set_disassoc(sdata, false, true);
2589
2590         mutex_unlock(&ifmgd->mtx);
2591
2592         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2593                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2594                         cookie, !req->local_state_change);
2595         sta_info_destroy_addr(sdata, bssid);
2596
2597         mutex_lock(&sdata->local->mtx);
2598         ieee80211_recalc_idle(sdata->local);
2599         mutex_unlock(&sdata->local->mtx);
2600
2601         return 0;
2602 }
2603
2604 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2605                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2606                                gfp_t gfp)
2607 {
2608         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2609
2610         trace_api_cqm_rssi_notify(sdata, rssi_event);
2611
2612         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2613 }
2614 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);