net/mac80211/mlme.c

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