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                 rcu_read_unlock();
 182         }
 183
 184         /* disable HT */
 185         if (!enable_ht)
 186                 return 0;
 187
 188         ht_opmode = le16_to_cpu(hti->operation_mode);
 189
 190         /* if bss configuration changed store the new one */
 191         if (!sdata->ht_opmode_valid ||
 192             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 193                 changed |= BSS_CHANGED_HT;
 194                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 195                 sdata->ht_opmode_valid = true;
 196         }
 197
 198         return changed;
 199 }
 200
 201 /* frame sending functions */
 202
 203 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 204                                            const u8 *bssid, u16 stype, u16 reason,
 205                                            void *cookie)
 206 {
 207         struct ieee80211_local *local = sdata->local;
 208         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 209         struct sk_buff *skb;
 210         struct ieee80211_mgmt *mgmt;
 211
 212         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 213         if (!skb) {
 214                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 215                        "deauth/disassoc frame\n", sdata->name);
 216                 return;
 217         }
 218         skb_reserve(skb, local->hw.extra_tx_headroom);
 219
 220         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 221         memset(mgmt, 0, 24);
 222         memcpy(mgmt->da, bssid, ETH_ALEN);
 223         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 224         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 225         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 226         skb_put(skb, 2);
 227         /* u.deauth.reason_code == u.disassoc.reason_code */
 228         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 229
 230         if (stype == IEEE80211_STYPE_DEAUTH)
 231                 if (cookie)
 232                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 233                 else
 234                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 235         else
 236                 if (cookie)
 237                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 238                 else
 239                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 240         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 241                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 242         ieee80211_tx_skb(sdata, skb);
 243 }
 244
 245 void ieee80211_send_pspoll(struct ieee80211_local *local,
 246                            struct ieee80211_sub_if_data *sdata)
 247 {
 248         struct ieee80211_pspoll *pspoll;
 249         struct sk_buff *skb;
 250
 251         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 252         if (!skb)
 253                 return;
 254
 255         pspoll = (struct ieee80211_pspoll *) skb->data;
 256         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 257
 258         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 259         ieee80211_tx_skb(sdata, skb);
 260 }
 261
 262 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 263                              struct ieee80211_sub_if_data *sdata,
 264                              int powersave)
 265 {
 266         struct sk_buff *skb;
 267         struct ieee80211_hdr_3addr *nullfunc;
 268
 269         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 270         if (!skb)
 271                 return;
 272
 273         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 274         if (powersave)
 275                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 276
 277         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 278         ieee80211_tx_skb(sdata, skb);
 279 }
 280
 281 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 282                                           struct ieee80211_sub_if_data *sdata)
 283 {
 284         struct sk_buff *skb;
 285         struct ieee80211_hdr *nullfunc;
 286         __le16 fc;
 287
 288         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 289                 return;
 290
 291         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 292         if (!skb) {
 293                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 294                        "nullfunc frame\n", sdata->name);
 295                 return;
 296         }
 297         skb_reserve(skb, local->hw.extra_tx_headroom);
 298
 299         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 300         memset(nullfunc, 0, 30);
 301         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 302                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 303         nullfunc->frame_control = fc;
 304         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 305         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 306         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 307         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 308
 309         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 310         ieee80211_tx_skb(sdata, skb);
 311 }
 312
 313 /* spectrum management related things */
 314 static void ieee80211_chswitch_work(struct work_struct *work)
 315 {
 316         struct ieee80211_sub_if_data *sdata =
 317                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 318         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 319
 320         if (!ieee80211_sdata_running(sdata))
 321                 return;
 322
 323         mutex_lock(&ifmgd->mtx);
 324         if (!ifmgd->associated)
 325                 goto out;
 326
 327         sdata->local->oper_channel = sdata->local->csa_channel;
 328         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
 329
 330         /* XXX: shouldn't really modify cfg80211-owned data! */
 331         ifmgd->associated->channel = sdata->local->oper_channel;
 332
 333         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 334                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 335  out:
 336         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 337         mutex_unlock(&ifmgd->mtx);
 338 }
 339
 340 static void ieee80211_chswitch_timer(unsigned long data)
 341 {
 342         struct ieee80211_sub_if_data *sdata =
 343                 (struct ieee80211_sub_if_data *) data;
 344         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 345
 346         if (sdata->local->quiescing) {
 347                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 348                 return;
 349         }
 350
 351         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 352 }
 353
 354 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 355                                       struct ieee80211_channel_sw_ie *sw_elem,
 356                                       struct ieee80211_bss *bss)
 357 {
 358         struct cfg80211_bss *cbss =
 359                 container_of((void *)bss, struct cfg80211_bss, priv);
 360         struct ieee80211_channel *new_ch;
 361         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 362         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 363
 364         ASSERT_MGD_MTX(ifmgd);
 365
 366         if (!ifmgd->associated)
 367                 return;
 368
 369         if (sdata->local->scanning)
 370                 return;
 371
 372         /* Disregard subsequent beacons if we are already running a timer
 373            processing a CSA */
 374
 375         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 376                 return;
 377
 378         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 379         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 380                 return;
 381
 382         sdata->local->csa_channel = new_ch;
 383
 384         if (sw_elem->count <= 1) {
 385                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 386         } else {
 387                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 388                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 389                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 390                 mod_timer(&ifmgd->chswitch_timer,
 391                           jiffies +
 392                           msecs_to_jiffies(sw_elem->count *
 393                                            cbss->beacon_interval));
 394         }
 395 }
 396
 397 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 398                                         u16 capab_info, u8 *pwr_constr_elem,
 399                                         u8 pwr_constr_elem_len)
 400 {
 401         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 402
 403         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 404                 return;
 405
 406         /* Power constraint IE length should be 1 octet */
 407         if (pwr_constr_elem_len != 1)
 408                 return;
 409
 410         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 411             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 412                 sdata->local->power_constr_level = *pwr_constr_elem;
 413                 ieee80211_hw_config(sdata->local, 0);
 414         }
 415 }
 416
 417 /* powersave */
 418 static void ieee80211_enable_ps(struct ieee80211_local *local,
 419                                 struct ieee80211_sub_if_data *sdata)
 420 {
 421         struct ieee80211_conf *conf = &local->hw.conf;
 422
 423         /*
 424          * If we are scanning right now then the parameters will
 425          * take effect when scan finishes.
 426          */
 427         if (local->scanning)
 428                 return;
 429
 430         if (conf->dynamic_ps_timeout > 0 &&
 431             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 432                 mod_timer(&local->dynamic_ps_timer, jiffies +
 433                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 434         } else {
 435                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 436                         ieee80211_send_nullfunc(local, sdata, 1);
 437
 438                 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
 439                         conf->flags |= IEEE80211_CONF_PS;
 440                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 441                 }
 442         }
 443 }
 444
 445 static void ieee80211_change_ps(struct ieee80211_local *local)
 446 {
 447         struct ieee80211_conf *conf = &local->hw.conf;
 448
 449         if (local->ps_sdata) {
 450                 ieee80211_enable_ps(local, local->ps_sdata);
 451         } else if (conf->flags & IEEE80211_CONF_PS) {
 452                 conf->flags &= ~IEEE80211_CONF_PS;
 453                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 454                 del_timer_sync(&local->dynamic_ps_timer);
 455                 cancel_work_sync(&local->dynamic_ps_enable_work);
 456         }
 457 }
 458
 459 /* need to hold RTNL or interface lock */
 460 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 461 {
 462         struct ieee80211_sub_if_data *sdata, *found = NULL;
 463         int count = 0;
 464
 465         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 466                 local->ps_sdata = NULL;
 467                 return;
 468         }
 469
 470         if (!list_empty(&local->work_list)) {
 471                 local->ps_sdata = NULL;
 472                 goto change;
 473         }
 474
 475         list_for_each_entry(sdata, &local->interfaces, list) {
 476                 if (!ieee80211_sdata_running(sdata))
 477                         continue;
 478                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 479                         continue;
 480                 found = sdata;
 481                 count++;
 482         }
 483
 484         if (count == 1 && found->u.mgd.powersave &&
 485             found->u.mgd.associated &&
 486             found->u.mgd.associated->beacon_ies &&
 487             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 488                                     IEEE80211_STA_CONNECTION_POLL))) {
 489                 s32 beaconint_us;
 490
 491                 if (latency < 0)
 492                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 493
 494                 beaconint_us = ieee80211_tu_to_usec(
 495                                         found->vif.bss_conf.beacon_int);
 496
 497                 if (beaconint_us > latency) {
 498                         local->ps_sdata = NULL;
 499                 } else {
 500                         struct ieee80211_bss *bss;
 501                         int maxslp = 1;
 502                         u8 dtimper;
 503
 504                         bss = (void *)found->u.mgd.associated->priv;
 505                         dtimper = bss->dtim_period;
 506
 507                         /* If the TIM IE is invalid, pretend the value is 1 */
 508                         if (!dtimper)
 509                                 dtimper = 1;
 510                         else if (dtimper > 1)
 511                                 maxslp = min_t(int, dtimper,
 512                                                     latency / beaconint_us);
 513
 514                         local->hw.conf.max_sleep_period = maxslp;
 515                         local->hw.conf.ps_dtim_period = dtimper;
 516                         local->ps_sdata = found;
 517                 }
 518         } else {
 519                 local->ps_sdata = NULL;
 520         }
 521
 522  change:
 523         ieee80211_change_ps(local);
 524 }
 525
 526 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 527 {
 528         struct ieee80211_local *local =
 529                 container_of(work, struct ieee80211_local,
 530                              dynamic_ps_disable_work);
 531
 532         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 533                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 534                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 535         }
 536
 537         ieee80211_wake_queues_by_reason(&local->hw,
 538                                         IEEE80211_QUEUE_STOP_REASON_PS);
 539 }
 540
 541 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 542 {
 543         struct ieee80211_local *local =
 544                 container_of(work, struct ieee80211_local,
 545                              dynamic_ps_enable_work);
 546         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 547         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 548
 549         /* can only happen when PS was just disabled anyway */
 550         if (!sdata)
 551                 return;
 552
 553         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 554                 return;
 555
 556         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 557             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 558                 ieee80211_send_nullfunc(local, sdata, 1);
 559
 560         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) ||
 561             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 562                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 563                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 564                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 565         }
 566 }
 567
 568 void ieee80211_dynamic_ps_timer(unsigned long data)
 569 {
 570         struct ieee80211_local *local = (void *) data;
 571
 572         if (local->quiescing || local->suspended)
 573                 return;
 574
 575         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 576 }
 577
 578 /* MLME */
 579 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 580                                      struct ieee80211_if_managed *ifmgd,
 581                                      u8 *wmm_param, size_t wmm_param_len)
 582 {
 583         struct ieee80211_tx_queue_params params;
 584         size_t left;
 585         int count;
 586         u8 *pos, uapsd_queues = 0;
 587
 588         if (local->hw.queues < 4)
 589                 return;
 590
 591         if (!wmm_param)
 592                 return;
 593
 594         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 595                 return;
 596
 597         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 598                 uapsd_queues = local->uapsd_queues;
 599
 600         count = wmm_param[6] & 0x0f;
 601         if (count == ifmgd->wmm_last_param_set)
 602                 return;
 603         ifmgd->wmm_last_param_set = count;
 604
 605         pos = wmm_param + 8;
 606         left = wmm_param_len - 8;
 607
 608         memset(&params, 0, sizeof(params));
 609
 610         local->wmm_acm = 0;
 611         for (; left >= 4; left -= 4, pos += 4) {
 612                 int aci = (pos[0] >> 5) & 0x03;
 613                 int acm = (pos[0] >> 4) & 0x01;
 614                 bool uapsd = false;
 615                 int queue;
 616
 617                 switch (aci) {
 618                 case 1: /* AC_BK */
 619                         queue = 3;
 620                         if (acm)
 621                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 622                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 623                                 uapsd = true;
 624                         break;
 625                 case 2: /* AC_VI */
 626                         queue = 1;
 627                         if (acm)
 628                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 629                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 630                                 uapsd = true;
 631                         break;
 632                 case 3: /* AC_VO */
 633                         queue = 0;
 634                         if (acm)
 635                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 636                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 637                                 uapsd = true;
 638                         break;
 639                 case 0: /* AC_BE */
 640                 default:
 641                         queue = 2;
 642                         if (acm)
 643                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 644                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 645                                 uapsd = true;
 646                         break;
 647                 }
 648
 649                 params.aifs = pos[0] & 0x0f;
 650                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 651                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 652                 params.txop = get_unaligned_le16(pos + 2);
 653                 params.uapsd = uapsd;
 654
 655 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 656                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 657                        "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 658                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 659                        params.aifs, params.cw_min, params.cw_max, params.txop,
 660                        params.uapsd);
 661 #endif
 662                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
 663                         printk(KERN_DEBUG "%s: failed to set TX queue "
 664                                "parameters for queue %d\n",
 665                                wiphy_name(local->hw.wiphy), queue);
 666         }
 667 }
 668
 669 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 670                                            u16 capab, bool erp_valid, u8 erp)
 671 {
 672         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 673         u32 changed = 0;
 674         bool use_protection;
 675         bool use_short_preamble;
 676         bool use_short_slot;
 677
 678         if (erp_valid) {
 679                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 680                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 681         } else {
 682                 use_protection = false;
 683                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 684         }
 685
 686         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 687         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 688                 use_short_slot = true;
 689
 690         if (use_protection != bss_conf->use_cts_prot) {
 691                 bss_conf->use_cts_prot = use_protection;
 692                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 693         }
 694
 695         if (use_short_preamble != bss_conf->use_short_preamble) {
 696                 bss_conf->use_short_preamble = use_short_preamble;
 697                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 698         }
 699
 700         if (use_short_slot != bss_conf->use_short_slot) {
 701                 bss_conf->use_short_slot = use_short_slot;
 702                 changed |= BSS_CHANGED_ERP_SLOT;
 703         }
 704
 705         return changed;
 706 }
 707
 708 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 709                                      struct cfg80211_bss *cbss,
 710                                      u32 bss_info_changed)
 711 {
 712         struct ieee80211_bss *bss = (void *)cbss->priv;
 713         struct ieee80211_local *local = sdata->local;
 714
 715         bss_info_changed |= BSS_CHANGED_ASSOC;
 716         /* set timing information */
 717         sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
 718         sdata->vif.bss_conf.timestamp = cbss->tsf;
 719
 720         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 721         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 722                 cbss->capability, bss->has_erp_value, bss->erp_value);
 723
 724         sdata->u.mgd.associated = cbss;
 725         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 726
 727         /* just to be sure */
 728         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 729                                 IEEE80211_STA_BEACON_POLL);
 730
 731         /*
 732          * Always handle WMM once after association regardless
 733          * of the first value the AP uses. Setting -1 here has
 734          * that effect because the AP values is an unsigned
 735          * 4-bit value.
 736          */
 737         sdata->u.mgd.wmm_last_param_set = -1;
 738
 739         ieee80211_led_assoc(local, 1);
 740
 741         sdata->vif.bss_conf.assoc = 1;
 742         /*
 743          * For now just always ask the driver to update the basic rateset
 744          * when we have associated, we aren't checking whether it actually
 745          * changed or not.
 746          */
 747         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 748
 749         /* And the BSSID changed - we're associated now */
 750         bss_info_changed |= BSS_CHANGED_BSSID;
 751
 752         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 753
 754         mutex_lock(&local->iflist_mtx);
 755         ieee80211_recalc_ps(local, -1);
 756         ieee80211_recalc_smps(local, sdata);
 757         mutex_unlock(&local->iflist_mtx);
 758
 759         netif_tx_start_all_queues(sdata->dev);
 760         netif_carrier_on(sdata->dev);
 761 }
 762
 763 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
 764 {
 765         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 766         struct ieee80211_local *local = sdata->local;
 767         struct sta_info *sta;
 768         u32 changed = 0, config_changed = 0;
 769         u8 bssid[ETH_ALEN];
 770
 771         ASSERT_MGD_MTX(ifmgd);
 772
 773         if (WARN_ON(!ifmgd->associated))
 774                 return;
 775
 776         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 777
 778         ifmgd->associated = NULL;
 779         memset(ifmgd->bssid, 0, ETH_ALEN);
 780
 781         /*
 782          * we need to commit the associated = NULL change because the
 783          * scan code uses that to determine whether this iface should
 784          * go to/wake up from powersave or not -- and could otherwise
 785          * wake the queues erroneously.
 786          */
 787         smp_mb();
 788
 789         /*
 790          * Thus, we can only afterwards stop the queues -- to account
 791          * for the case where another CPU is finishing a scan at this
 792          * time -- we don't want the scan code to enable queues.
 793          */
 794
 795         netif_tx_stop_all_queues(sdata->dev);
 796         netif_carrier_off(sdata->dev);
 797
 798         rcu_read_lock();
 799         sta = sta_info_get(sdata, bssid);
 800         if (sta) {
 801                 set_sta_flags(sta, WLAN_STA_DISASSOC);
 802                 ieee80211_sta_tear_down_BA_sessions(sta);
 803         }
 804         rcu_read_unlock();
 805
 806         changed |= ieee80211_reset_erp_info(sdata);
 807
 808         ieee80211_led_assoc(local, 0);
 809         changed |= BSS_CHANGED_ASSOC;
 810         sdata->vif.bss_conf.assoc = false;
 811
 812         ieee80211_set_wmm_default(sdata);
 813
 814         /* channel(_type) changes are handled by ieee80211_hw_config */
 815         local->oper_channel_type = NL80211_CHAN_NO_HT;
 816
 817         /* on the next assoc, re-program HT parameters */
 818         sdata->ht_opmode_valid = false;
 819
 820         local->power_constr_level = 0;
 821
 822         del_timer_sync(&local->dynamic_ps_timer);
 823         cancel_work_sync(&local->dynamic_ps_enable_work);
 824
 825         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 826                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 827                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 828         }
 829
 830         ieee80211_hw_config(local, config_changed);
 831
 832         /* And the BSSID changed -- not very interesting here */
 833         changed |= BSS_CHANGED_BSSID;
 834         ieee80211_bss_info_change_notify(sdata, changed);
 835
 836         sta_info_destroy_addr(sdata, bssid);
 837 }
 838
 839 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 840                              struct ieee80211_hdr *hdr)
 841 {
 842         /*
 843          * We can postpone the mgd.timer whenever receiving unicast frames
 844          * from AP because we know that the connection is working both ways
 845          * at that time. But multicast frames (and hence also beacons) must
 846          * be ignored here, because we need to trigger the timer during
 847          * data idle periods for sending the periodic probe request to the
 848          * AP we're connected to.
 849          */
 850         if (is_multicast_ether_addr(hdr->addr1))
 851                 return;
 852
 853         mod_timer(&sdata->u.mgd.conn_mon_timer,
 854                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 855 }
 856
 857 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
 858 {
 859         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 860         const u8 *ssid;
 861
 862         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
 863         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
 864                                  ssid + 2, ssid[1], NULL, 0);
 865
 866         ifmgd->probe_send_count++;
 867         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
 868         run_again(ifmgd, ifmgd->probe_timeout);
 869 }
 870
 871 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
 872                                    bool beacon)
 873 {
 874         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 875         bool already = false;
 876
 877         if (!ieee80211_sdata_running(sdata))
 878                 return;
 879
 880         if (sdata->local->scanning)
 881                 return;
 882
 883         if (sdata->local->tmp_channel)
 884                 return;
 885
 886         mutex_lock(&ifmgd->mtx);
 887
 888         if (!ifmgd->associated)
 889                 goto out;
 890
 891 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 892         if (beacon && net_ratelimit())
 893                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
 894                        "- sending probe request\n", sdata->name);
 895 #endif
 896
 897         /*
 898          * The driver/our work has already reported this event or the
 899          * connection monitoring has kicked in and we have already sent
 900          * a probe request. Or maybe the AP died and the driver keeps
 901          * reporting until we disassociate...
 902          *
 903          * In either case we have to ignore the current call to this
 904          * function (except for setting the correct probe reason bit)
 905          * because otherwise we would reset the timer every time and
 906          * never check whether we received a probe response!
 907          */
 908         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 909                             IEEE80211_STA_CONNECTION_POLL))
 910                 already = true;
 911
 912         if (beacon)
 913                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
 914         else
 915                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
 916
 917         if (already)
 918                 goto out;
 919
 920         mutex_lock(&sdata->local->iflist_mtx);
 921         ieee80211_recalc_ps(sdata->local, -1);
 922         mutex_unlock(&sdata->local->iflist_mtx);
 923
 924         ifmgd->probe_send_count = 0;
 925         ieee80211_mgd_probe_ap_send(sdata);
 926  out:
 927         mutex_unlock(&ifmgd->mtx);
 928 }
 929
 930 void ieee80211_beacon_loss_work(struct work_struct *work)
 931 {
 932         struct ieee80211_sub_if_data *sdata =
 933                 container_of(work, struct ieee80211_sub_if_data,
 934                              u.mgd.beacon_loss_work);
 935
 936         ieee80211_mgd_probe_ap(sdata, true);
 937 }
 938
 939 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
 940 {
 941         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 942
 943         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
 944 }
 945 EXPORT_SYMBOL(ieee80211_beacon_loss);
 946
 947 static enum rx_mgmt_action __must_check
 948 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
 949                          struct ieee80211_mgmt *mgmt, size_t len)
 950 {
 951         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 952         const u8 *bssid = NULL;
 953         u16 reason_code;
 954
 955         if (len < 24 + 2)
 956                 return RX_MGMT_NONE;
 957
 958         ASSERT_MGD_MTX(ifmgd);
 959
 960         bssid = ifmgd->associated->bssid;
 961
 962         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
 963
 964         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
 965                         sdata->name, bssid, reason_code);
 966
 967         ieee80211_set_disassoc(sdata);
 968         ieee80211_recalc_idle(sdata->local);
 969
 970         return RX_MGMT_CFG80211_DEAUTH;
 971 }
 972
 973
 974 static enum rx_mgmt_action __must_check
 975 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
 976                            struct ieee80211_mgmt *mgmt, size_t len)
 977 {
 978         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 979         u16 reason_code;
 980
 981         if (len < 24 + 2)
 982                 return RX_MGMT_NONE;
 983
 984         ASSERT_MGD_MTX(ifmgd);
 985
 986         if (WARN_ON(!ifmgd->associated))
 987                 return RX_MGMT_NONE;
 988
 989         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
 990                 return RX_MGMT_NONE;
 991
 992         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
 993
 994         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
 995                         sdata->name, mgmt->sa, reason_code);
 996
 997         ieee80211_set_disassoc(sdata);
 998         ieee80211_recalc_idle(sdata->local);
 999         return RX_MGMT_CFG80211_DISASSOC;
1000 }
1001
1002
1003 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1004                                     struct ieee80211_mgmt *mgmt, size_t len)
1005 {
1006         struct ieee80211_sub_if_data *sdata = wk->sdata;
1007         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1008         struct ieee80211_local *local = sdata->local;
1009         struct ieee80211_supported_band *sband;
1010         struct sta_info *sta;
1011         struct cfg80211_bss *cbss = wk->assoc.bss;
1012         u8 *pos;
1013         u32 rates, basic_rates;
1014         u16 capab_info, aid;
1015         struct ieee802_11_elems elems;
1016         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1017         u32 changed = 0;
1018         int i, j, err;
1019         bool have_higher_than_11mbit = false;
1020         u16 ap_ht_cap_flags;
1021
1022         /* AssocResp and ReassocResp have identical structure */
1023
1024         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1025         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1026
1027         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1028                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1029                        "set\n", sdata->name, aid);
1030         aid &= ~(BIT(15) | BIT(14));
1031
1032         pos = mgmt->u.assoc_resp.variable;
1033         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1034
1035         if (!elems.supp_rates) {
1036                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1037                        sdata->name);
1038                 return false;
1039         }
1040
1041         ifmgd->aid = aid;
1042
1043         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1044         if (!sta) {
1045                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1046                        " the AP\n", sdata->name);
1047                 return false;
1048         }
1049
1050         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1051                            WLAN_STA_ASSOC_AP);
1052         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1053                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1054
1055         rates = 0;
1056         basic_rates = 0;
1057         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1058
1059         for (i = 0; i < elems.supp_rates_len; i++) {
1060                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1061                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1062
1063                 if (rate > 110)
1064                         have_higher_than_11mbit = true;
1065
1066                 for (j = 0; j < sband->n_bitrates; j++) {
1067                         if (sband->bitrates[j].bitrate == rate) {
1068                                 rates |= BIT(j);
1069                                 if (is_basic)
1070                                         basic_rates |= BIT(j);
1071                                 break;
1072                         }
1073                 }
1074         }
1075
1076         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1077                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1078                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1079
1080                 if (rate > 110)
1081                         have_higher_than_11mbit = true;
1082
1083                 for (j = 0; j < sband->n_bitrates; j++) {
1084                         if (sband->bitrates[j].bitrate == rate) {
1085                                 rates |= BIT(j);
1086                                 if (is_basic)
1087                                         basic_rates |= BIT(j);
1088                                 break;
1089                         }
1090                 }
1091         }
1092
1093         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1094         sdata->vif.bss_conf.basic_rates = basic_rates;
1095
1096         /* cf. IEEE 802.11 9.2.12 */
1097         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1098             have_higher_than_11mbit)
1099                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1100         else
1101                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1102
1103         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1104                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1105                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1106
1107         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1108
1109         rate_control_rate_init(sta);
1110
1111         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1112                 set_sta_flags(sta, WLAN_STA_MFP);
1113
1114         if (elems.wmm_param)
1115                 set_sta_flags(sta, WLAN_STA_WME);
1116
1117         err = sta_info_insert(sta);
1118         sta = NULL;
1119         if (err) {
1120                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1121                        " the AP (error %d)\n", sdata->name, err);
1122                 return false;
1123         }
1124
1125         if (elems.wmm_param)
1126                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1127                                          elems.wmm_param_len);
1128         else
1129                 ieee80211_set_wmm_default(sdata);
1130
1131         local->oper_channel = wk->chan;
1132
1133         if (elems.ht_info_elem && elems.wmm_param &&
1134             (sdata->local->hw.queues >= 4) &&
1135             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1136                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1137                                                cbss->bssid, ap_ht_cap_flags);
1138
1139         /* set AID and assoc capability,
1140          * ieee80211_set_associated() will tell the driver */
1141         bss_conf->aid = aid;
1142         bss_conf->assoc_capability = capab_info;
1143         ieee80211_set_associated(sdata, cbss, changed);
1144
1145         /*
1146          * If we're using 4-addr mode, let the AP know that we're
1147          * doing so, so that it can create the STA VLAN on its side
1148          */
1149         if (ifmgd->use_4addr)
1150                 ieee80211_send_4addr_nullfunc(local, sdata);
1151
1152         /*
1153          * Start timer to probe the connection to the AP now.
1154          * Also start the timer that will detect beacon loss.
1155          */
1156         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1157         mod_beacon_timer(sdata);
1158
1159         return true;
1160 }
1161
1162
1163 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1164                                   struct ieee80211_mgmt *mgmt,
1165                                   size_t len,
1166                                   struct ieee80211_rx_status *rx_status,
1167                                   struct ieee802_11_elems *elems,
1168                                   bool beacon)
1169 {
1170         struct ieee80211_local *local = sdata->local;
1171         int freq;
1172         struct ieee80211_bss *bss;
1173         struct ieee80211_channel *channel;
1174         bool need_ps = false;
1175
1176         if (sdata->u.mgd.associated) {
1177                 bss = (void *)sdata->u.mgd.associated->priv;
1178                 /* not previously set so we may need to recalc */
1179                 need_ps = !bss->dtim_period;
1180         }
1181
1182         if (elems->ds_params && elems->ds_params_len == 1)
1183                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1184         else
1185                 freq = rx_status->freq;
1186
1187         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1188
1189         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1190                 return;
1191
1192         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1193                                         channel, beacon);
1194         if (bss)
1195                 ieee80211_rx_bss_put(local, bss);
1196
1197         if (!sdata->u.mgd.associated)
1198                 return;
1199
1200         if (need_ps) {
1201                 mutex_lock(&local->iflist_mtx);
1202                 ieee80211_recalc_ps(local, -1);
1203                 mutex_unlock(&local->iflist_mtx);
1204         }
1205
1206         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1207             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1208                                                         ETH_ALEN) == 0)) {
1209                 struct ieee80211_channel_sw_ie *sw_elem =
1210                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1211                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1212         }
1213 }
1214
1215
1216 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1217                                          struct sk_buff *skb)
1218 {
1219         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1220         struct ieee80211_if_managed *ifmgd;
1221         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1222         size_t baselen, len = skb->len;
1223         struct ieee802_11_elems elems;
1224
1225         ifmgd = &sdata->u.mgd;
1226
1227         ASSERT_MGD_MTX(ifmgd);
1228
1229         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1230                 return; /* ignore ProbeResp to foreign address */
1231
1232         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1233         if (baselen > len)
1234                 return;
1235
1236         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1237                                 &elems);
1238
1239         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1240
1241         if (ifmgd->associated &&
1242             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1243             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1244                             IEEE80211_STA_CONNECTION_POLL)) {
1245                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1246                                   IEEE80211_STA_BEACON_POLL);
1247                 mutex_lock(&sdata->local->iflist_mtx);
1248                 ieee80211_recalc_ps(sdata->local, -1);
1249                 mutex_unlock(&sdata->local->iflist_mtx);
1250                 /*
1251                  * We've received a probe response, but are not sure whether
1252                  * we have or will be receiving any beacons or data, so let's
1253                  * schedule the timers again, just in case.
1254                  */
1255                 mod_beacon_timer(sdata);
1256                 mod_timer(&ifmgd->conn_mon_timer,
1257                           round_jiffies_up(jiffies +
1258                                            IEEE80211_CONNECTION_IDLE_TIME));
1259         }
1260 }
1261
1262 /*
1263  * This is the canonical list of information elements we care about,
1264  * the filter code also gives us all changes to the Microsoft OUI
1265  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1266  *
1267  * We implement beacon filtering in software since that means we can
1268  * avoid processing the frame here and in cfg80211, and userspace
1269  * will not be able to tell whether the hardware supports it or not.
1270  *
1271  * XXX: This list needs to be dynamic -- userspace needs to be able to
1272  *      add items it requires. It also needs to be able to tell us to
1273  *      look out for other vendor IEs.
1274  */
1275 static const u64 care_about_ies =
1276         (1ULL << WLAN_EID_COUNTRY) |
1277         (1ULL << WLAN_EID_ERP_INFO) |
1278         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1279         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1280         (1ULL << WLAN_EID_HT_CAPABILITY) |
1281         (1ULL << WLAN_EID_HT_INFORMATION);
1282
1283 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1284                                      struct ieee80211_mgmt *mgmt,
1285                                      size_t len,
1286                                      struct ieee80211_rx_status *rx_status)
1287 {
1288         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1289         size_t baselen;
1290         struct ieee802_11_elems elems;
1291         struct ieee80211_local *local = sdata->local;
1292         u32 changed = 0;
1293         bool erp_valid, directed_tim = false;
1294         u8 erp_value = 0;
1295         u32 ncrc;
1296         u8 *bssid;
1297
1298         ASSERT_MGD_MTX(ifmgd);
1299
1300         /* Process beacon from the current BSS */
1301         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1302         if (baselen > len)
1303                 return;
1304
1305         if (rx_status->freq != local->hw.conf.channel->center_freq)
1306                 return;
1307
1308         /*
1309          * We might have received a number of frames, among them a
1310          * disassoc frame and a beacon...
1311          */
1312         if (!ifmgd->associated)
1313                 return;
1314
1315         bssid = ifmgd->associated->bssid;
1316
1317         /*
1318          * And in theory even frames from a different AP we were just
1319          * associated to a split-second ago!
1320          */
1321         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1322                 return;
1323
1324         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1325 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1326                 if (net_ratelimit()) {
1327                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1328                                "to a received beacon\n", sdata->name);
1329                 }
1330 #endif
1331                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1332                 mutex_lock(&local->iflist_mtx);
1333                 ieee80211_recalc_ps(local, -1);
1334                 mutex_unlock(&local->iflist_mtx);
1335         }
1336
1337         /*
1338          * Push the beacon loss detection into the future since
1339          * we are processing a beacon from the AP just now.
1340          */
1341         mod_beacon_timer(sdata);
1342
1343         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1344         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1345                                           len - baselen, &elems,
1346                                           care_about_ies, ncrc);
1347
1348         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1349                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1350                                                    ifmgd->aid);
1351
1352         if (ncrc != ifmgd->beacon_crc) {
1353                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1354                                       true);
1355
1356                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1357                                          elems.wmm_param_len);
1358         }
1359
1360         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1361                 if (directed_tim) {
1362                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1363                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1364                                 ieee80211_hw_config(local,
1365                                                     IEEE80211_CONF_CHANGE_PS);
1366                                 ieee80211_send_nullfunc(local, sdata, 0);
1367                         } else {
1368                                 local->pspolling = true;
1369
1370                                 /*
1371                                  * Here is assumed that the driver will be
1372                                  * able to send ps-poll frame and receive a
1373                                  * response even though power save mode is
1374                                  * enabled, but some drivers might require
1375                                  * to disable power save here. This needs
1376                                  * to be investigated.
1377                                  */
1378                                 ieee80211_send_pspoll(local, sdata);
1379                         }
1380                 }
1381         }
1382
1383         if (ncrc == ifmgd->beacon_crc)
1384                 return;
1385         ifmgd->beacon_crc = ncrc;
1386
1387         if (elems.erp_info && elems.erp_info_len >= 1) {
1388                 erp_valid = true;
1389                 erp_value = elems.erp_info[0];
1390         } else {
1391                 erp_valid = false;
1392         }
1393         changed |= ieee80211_handle_bss_capability(sdata,
1394                         le16_to_cpu(mgmt->u.beacon.capab_info),
1395                         erp_valid, erp_value);
1396
1397
1398         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1399             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1400                 struct sta_info *sta;
1401                 struct ieee80211_supported_band *sband;
1402                 u16 ap_ht_cap_flags;
1403
1404                 rcu_read_lock();
1405
1406                 sta = sta_info_get(sdata, bssid);
1407                 if (WARN_ON(!sta)) {
1408                         rcu_read_unlock();
1409                         return;
1410                 }
1411
1412                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1413
1414                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1415                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1416
1417                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1418
1419                 rcu_read_unlock();
1420
1421                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1422                                                bssid, ap_ht_cap_flags);
1423         }
1424
1425         /* Note: country IE parsing is done for us by cfg80211 */
1426         if (elems.country_elem) {
1427                 /* TODO: IBSS also needs this */
1428                 if (elems.pwr_constr_elem)
1429                         ieee80211_handle_pwr_constr(sdata,
1430                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1431                                 elems.pwr_constr_elem,
1432                                 elems.pwr_constr_elem_len);
1433         }
1434
1435         ieee80211_bss_info_change_notify(sdata, changed);
1436 }
1437
1438 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1439                                           struct sk_buff *skb)
1440 {
1441         struct ieee80211_local *local = sdata->local;
1442         struct ieee80211_mgmt *mgmt;
1443         u16 fc;
1444
1445         if (skb->len < 24)
1446                 return RX_DROP_MONITOR;
1447
1448         mgmt = (struct ieee80211_mgmt *) skb->data;
1449         fc = le16_to_cpu(mgmt->frame_control);
1450
1451         switch (fc & IEEE80211_FCTL_STYPE) {
1452         case IEEE80211_STYPE_PROBE_RESP:
1453         case IEEE80211_STYPE_BEACON:
1454         case IEEE80211_STYPE_DEAUTH:
1455         case IEEE80211_STYPE_DISASSOC:
1456         case IEEE80211_STYPE_ACTION:
1457                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1458                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1459                 return RX_QUEUED;
1460         }
1461
1462         return RX_DROP_MONITOR;
1463 }
1464
1465 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1466                                          struct sk_buff *skb)
1467 {
1468         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1469         struct ieee80211_rx_status *rx_status;
1470         struct ieee80211_mgmt *mgmt;
1471         enum rx_mgmt_action rma = RX_MGMT_NONE;
1472         u16 fc;
1473
1474         rx_status = (struct ieee80211_rx_status *) skb->cb;
1475         mgmt = (struct ieee80211_mgmt *) skb->data;
1476         fc = le16_to_cpu(mgmt->frame_control);
1477
1478         mutex_lock(&ifmgd->mtx);
1479
1480         if (ifmgd->associated &&
1481             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1482                 switch (fc & IEEE80211_FCTL_STYPE) {
1483                 case IEEE80211_STYPE_BEACON:
1484                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1485                                                  rx_status);
1486                         break;
1487                 case IEEE80211_STYPE_PROBE_RESP:
1488                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1489                         break;
1490                 case IEEE80211_STYPE_DEAUTH:
1491                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1492                         break;
1493                 case IEEE80211_STYPE_DISASSOC:
1494                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1495                         break;
1496                 case IEEE80211_STYPE_ACTION:
1497                         if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1498                                 break;
1499
1500                         ieee80211_sta_process_chanswitch(sdata,
1501                                         &mgmt->u.action.u.chan_switch.sw_elem,
1502                                         (void *)ifmgd->associated->priv);
1503                         break;
1504                 }
1505                 mutex_unlock(&ifmgd->mtx);
1506
1507                 switch (rma) {
1508                 case RX_MGMT_NONE:
1509                         /* no action */
1510                         break;
1511                 case RX_MGMT_CFG80211_DEAUTH:
1512                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1513                         break;
1514                 case RX_MGMT_CFG80211_DISASSOC:
1515                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1516                         break;
1517                 default:
1518                         WARN(1, "unexpected: %d", rma);
1519                 }
1520                 goto out;
1521         }
1522
1523         mutex_unlock(&ifmgd->mtx);
1524
1525         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1526             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1527                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1528
1529  out:
1530         kfree_skb(skb);
1531 }
1532
1533 static void ieee80211_sta_timer(unsigned long data)
1534 {
1535         struct ieee80211_sub_if_data *sdata =
1536                 (struct ieee80211_sub_if_data *) data;
1537         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1538         struct ieee80211_local *local = sdata->local;
1539
1540         if (local->quiescing) {
1541                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1542                 return;
1543         }
1544
1545         ieee80211_queue_work(&local->hw, &ifmgd->work);
1546 }
1547
1548 static void ieee80211_sta_work(struct work_struct *work)
1549 {
1550         struct ieee80211_sub_if_data *sdata =
1551                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1552         struct ieee80211_local *local = sdata->local;
1553         struct ieee80211_if_managed *ifmgd;
1554         struct sk_buff *skb;
1555
1556         if (!ieee80211_sdata_running(sdata))
1557                 return;
1558
1559         if (local->scanning)
1560                 return;
1561
1562         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1563                 return;
1564
1565         /*
1566          * ieee80211_queue_work() should have picked up most cases,
1567          * here we'll pick the the rest.
1568          */
1569         if (WARN(local->suspended, "STA MLME work scheduled while "
1570                  "going to suspend\n"))
1571                 return;
1572
1573         ifmgd = &sdata->u.mgd;
1574
1575         /* first process frames to avoid timing out while a frame is pending */
1576         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1577                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1578
1579         /* then process the rest of the work */
1580         mutex_lock(&ifmgd->mtx);
1581
1582         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1583                             IEEE80211_STA_CONNECTION_POLL) &&
1584             ifmgd->associated) {
1585                 u8 bssid[ETH_ALEN];
1586
1587                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1588                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1589                         run_again(ifmgd, ifmgd->probe_timeout);
1590
1591                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1592 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1593                         printk(KERN_DEBUG "No probe response from AP %pM"
1594                                 " after %dms, try %d\n", bssid,
1595                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1596                                 ifmgd->probe_send_count);
1597 #endif
1598                         ieee80211_mgd_probe_ap_send(sdata);
1599                 } else {
1600                         /*
1601                          * We actually lost the connection ... or did we?
1602                          * Let's make sure!
1603                          */
1604                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1605                                           IEEE80211_STA_BEACON_POLL);
1606                         printk(KERN_DEBUG "No probe response from AP %pM"
1607                                 " after %dms, disconnecting.\n",
1608                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1609                         ieee80211_set_disassoc(sdata);
1610                         ieee80211_recalc_idle(local);
1611                         mutex_unlock(&ifmgd->mtx);
1612                         /*
1613                          * must be outside lock due to cfg80211,
1614                          * but that's not a problem.
1615                          */
1616                         ieee80211_send_deauth_disassoc(sdata, bssid,
1617                                         IEEE80211_STYPE_DEAUTH,
1618                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1619                                         NULL);
1620                         mutex_lock(&ifmgd->mtx);
1621                 }
1622         }
1623
1624         mutex_unlock(&ifmgd->mtx);
1625 }
1626
1627 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1628 {
1629         struct ieee80211_sub_if_data *sdata =
1630                 (struct ieee80211_sub_if_data *) data;
1631         struct ieee80211_local *local = sdata->local;
1632
1633         if (local->quiescing)
1634                 return;
1635
1636         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1637 }
1638
1639 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1640 {
1641         struct ieee80211_sub_if_data *sdata =
1642                 (struct ieee80211_sub_if_data *) data;
1643         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1644         struct ieee80211_local *local = sdata->local;
1645
1646         if (local->quiescing)
1647                 return;
1648
1649         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1650 }
1651
1652 static void ieee80211_sta_monitor_work(struct work_struct *work)
1653 {
1654         struct ieee80211_sub_if_data *sdata =
1655                 container_of(work, struct ieee80211_sub_if_data,
1656                              u.mgd.monitor_work);
1657
1658         ieee80211_mgd_probe_ap(sdata, false);
1659 }
1660
1661 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1662 {
1663         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1664                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1665                                         IEEE80211_STA_CONNECTION_POLL);
1666
1667                 /* let's probe the connection once */
1668                 ieee80211_queue_work(&sdata->local->hw,
1669                            &sdata->u.mgd.monitor_work);
1670                 /* and do all the other regular work too */
1671                 ieee80211_queue_work(&sdata->local->hw,
1672                            &sdata->u.mgd.work);
1673         }
1674 }
1675
1676 #ifdef CONFIG_PM
1677 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1678 {
1679         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1680
1681         /*
1682          * we need to use atomic bitops for the running bits
1683          * only because both timers might fire at the same
1684          * time -- the code here is properly synchronised.
1685          */
1686
1687         cancel_work_sync(&ifmgd->work);
1688         cancel_work_sync(&ifmgd->beacon_loss_work);
1689         if (del_timer_sync(&ifmgd->timer))
1690                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1691
1692         cancel_work_sync(&ifmgd->chswitch_work);
1693         if (del_timer_sync(&ifmgd->chswitch_timer))
1694                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1695
1696         cancel_work_sync(&ifmgd->monitor_work);
1697         /* these will just be re-established on connection */
1698         del_timer_sync(&ifmgd->conn_mon_timer);
1699         del_timer_sync(&ifmgd->bcn_mon_timer);
1700 }
1701
1702 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1703 {
1704         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1705
1706         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1707                 add_timer(&ifmgd->timer);
1708         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1709                 add_timer(&ifmgd->chswitch_timer);
1710 }
1711 #endif
1712
1713 /* interface setup */
1714 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1715 {
1716         struct ieee80211_if_managed *ifmgd;
1717
1718         ifmgd = &sdata->u.mgd;
1719         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1720         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1721         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1722         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
1723         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1724                     (unsigned long) sdata);
1725         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1726                     (unsigned long) sdata);
1727         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1728                     (unsigned long) sdata);
1729         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1730                     (unsigned long) sdata);
1731         skb_queue_head_init(&ifmgd->skb_queue);
1732
1733         ifmgd->flags = 0;
1734
1735         mutex_init(&ifmgd->mtx);
1736
1737         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1738                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1739         else
1740                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1741 }
1742
1743 /* scan finished notification */
1744 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1745 {
1746         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1747
1748         /* Restart STA timers */
1749         rcu_read_lock();
1750         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1751                 ieee80211_restart_sta_timer(sdata);
1752         rcu_read_unlock();
1753 }
1754
1755 int ieee80211_max_network_latency(struct notifier_block *nb,
1756                                   unsigned long data, void *dummy)
1757 {
1758         s32 latency_usec = (s32) data;
1759         struct ieee80211_local *local =
1760                 container_of(nb, struct ieee80211_local,
1761                              network_latency_notifier);
1762
1763         mutex_lock(&local->iflist_mtx);
1764         ieee80211_recalc_ps(local, latency_usec);
1765         mutex_unlock(&local->iflist_mtx);
1766
1767         return 0;
1768 }
1769
1770 /* config hooks */
1771 static enum work_done_result
1772 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1773                           struct sk_buff *skb)
1774 {
1775         if (!skb) {
1776                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1777                 return WORK_DONE_DESTROY;
1778         }
1779
1780         if (wk->type == IEEE80211_WORK_AUTH) {
1781                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1782                 return WORK_DONE_DESTROY;
1783         }
1784
1785         mutex_lock(&wk->sdata->u.mgd.mtx);
1786         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1787         mutex_unlock(&wk->sdata->u.mgd.mtx);
1788
1789         wk->type = IEEE80211_WORK_AUTH;
1790         wk->probe_auth.tries = 0;
1791         return WORK_DONE_REQUEUE;
1792 }
1793
1794 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1795                        struct cfg80211_auth_request *req)
1796 {
1797         const u8 *ssid;
1798         struct ieee80211_work *wk;
1799         u16 auth_alg;
1800
1801         switch (req->auth_type) {
1802         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1803                 auth_alg = WLAN_AUTH_OPEN;
1804                 break;
1805         case NL80211_AUTHTYPE_SHARED_KEY:
1806                 auth_alg = WLAN_AUTH_SHARED_KEY;
1807                 break;
1808         case NL80211_AUTHTYPE_FT:
1809                 auth_alg = WLAN_AUTH_FT;
1810                 break;
1811         case NL80211_AUTHTYPE_NETWORK_EAP:
1812                 auth_alg = WLAN_AUTH_LEAP;
1813                 break;
1814         default:
1815                 return -EOPNOTSUPP;
1816         }
1817
1818         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1819         if (!wk)
1820                 return -ENOMEM;
1821
1822         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1823
1824         if (req->ie && req->ie_len) {
1825                 memcpy(wk->ie, req->ie, req->ie_len);
1826                 wk->ie_len = req->ie_len;
1827         }
1828
1829         if (req->key && req->key_len) {
1830                 wk->probe_auth.key_len = req->key_len;
1831                 wk->probe_auth.key_idx = req->key_idx;
1832                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1833         }
1834
1835         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1836         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1837         wk->probe_auth.ssid_len = ssid[1];
1838
1839         wk->probe_auth.algorithm = auth_alg;
1840         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1841
1842         /* if we already have a probe, don't probe again */
1843         if (req->bss->proberesp_ies)
1844                 wk->type = IEEE80211_WORK_AUTH;
1845         else
1846                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1847         wk->chan = req->bss->channel;
1848         wk->sdata = sdata;
1849         wk->done = ieee80211_probe_auth_done;
1850
1851         ieee80211_add_work(wk);
1852         return 0;
1853 }
1854
1855 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1856                                                   struct sk_buff *skb)
1857 {
1858         struct ieee80211_mgmt *mgmt;
1859         u16 status;
1860
1861         if (!skb) {
1862                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1863                 return WORK_DONE_DESTROY;
1864         }
1865
1866         mgmt = (void *)skb->data;
1867         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1868
1869         if (status == WLAN_STATUS_SUCCESS) {
1870                 mutex_lock(&wk->sdata->u.mgd.mtx);
1871                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1872                         mutex_unlock(&wk->sdata->u.mgd.mtx);
1873                         /* oops -- internal error -- send timeout for now */
1874                         cfg80211_send_assoc_timeout(wk->sdata->dev,
1875                                                     wk->filter_ta);
1876                         return WORK_DONE_DESTROY;
1877                 }
1878                 mutex_unlock(&wk->sdata->u.mgd.mtx);
1879         }
1880
1881         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1882         return WORK_DONE_DESTROY;
1883 }
1884
1885 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1886                         struct cfg80211_assoc_request *req)
1887 {
1888         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1889         struct ieee80211_bss *bss = (void *)req->bss->priv;
1890         struct ieee80211_work *wk;
1891         const u8 *ssid;
1892         int i;
1893
1894         mutex_lock(&ifmgd->mtx);
1895         if (ifmgd->associated) {
1896                 mutex_unlock(&ifmgd->mtx);
1897                 return -EALREADY;
1898         }
1899         mutex_unlock(&ifmgd->mtx);
1900
1901         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1902         if (!wk)
1903                 return -ENOMEM;
1904
1905         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
1906         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1907
1908         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
1909                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
1910                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
1911                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
1912                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
1913
1914
1915         if (req->ie && req->ie_len) {
1916                 memcpy(wk->ie, req->ie, req->ie_len);
1917                 wk->ie_len = req->ie_len;
1918         } else
1919                 wk->ie_len = 0;
1920
1921         wk->assoc.bss = req->bss;
1922
1923         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1924
1925         /* new association always uses requested smps mode */
1926         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
1927                 if (ifmgd->powersave)
1928                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
1929                 else
1930                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
1931         } else
1932                 ifmgd->ap_smps = ifmgd->req_smps;
1933
1934         wk->assoc.smps = ifmgd->ap_smps;
1935         /*
1936          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
1937          * We still associate in non-HT mode (11a/b/g) if any one of these
1938          * ciphers is configured as pairwise.
1939          * We can set this to true for non-11n hardware, that'll be checked
1940          * separately along with the peer capabilities.
1941          */
1942         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
1943         wk->assoc.capability = req->bss->capability;
1944         wk->assoc.wmm_used = bss->wmm_used;
1945         wk->assoc.supp_rates = bss->supp_rates;
1946         wk->assoc.supp_rates_len = bss->supp_rates_len;
1947         wk->assoc.ht_information_ie =
1948                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
1949
1950         if (bss->wmm_used && bss->uapsd_supported &&
1951             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
1952                 wk->assoc.uapsd_used = true;
1953                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
1954         } else {
1955                 wk->assoc.uapsd_used = false;
1956                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
1957         }
1958
1959         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1960         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
1961         wk->assoc.ssid_len = ssid[1];
1962
1963         if (req->prev_bssid)
1964                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
1965
1966         wk->type = IEEE80211_WORK_ASSOC;
1967         wk->chan = req->bss->channel;
1968         wk->sdata = sdata;
1969         wk->done = ieee80211_assoc_done;
1970
1971         if (req->use_mfp) {
1972                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
1973                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
1974         } else {
1975                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
1976                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
1977         }
1978
1979         if (req->crypto.control_port)
1980                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
1981         else
1982                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
1983
1984         ieee80211_add_work(wk);
1985         return 0;
1986 }
1987
1988 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
1989                          struct cfg80211_deauth_request *req,
1990                          void *cookie)
1991 {
1992         struct ieee80211_local *local = sdata->local;
1993         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1994         struct ieee80211_work *wk;
1995         const u8 *bssid = req->bss->bssid;
1996
1997         mutex_lock(&ifmgd->mtx);
1998
1999         if (ifmgd->associated == req->bss) {
2000                 bssid = req->bss->bssid;
2001                 ieee80211_set_disassoc(sdata);
2002                 mutex_unlock(&ifmgd->mtx);
2003         } else {
2004                 bool not_auth_yet = false;
2005
2006                 mutex_unlock(&ifmgd->mtx);
2007
2008                 mutex_lock(&local->work_mtx);
2009                 list_for_each_entry(wk, &local->work_list, list) {
2010                         if (wk->sdata != sdata)
2011                                 continue;
2012
2013                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2014                             wk->type != IEEE80211_WORK_AUTH)
2015                                 continue;
2016
2017                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2018                                 continue;
2019
2020                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2021                         list_del_rcu(&wk->list);
2022                         free_work(wk);
2023                         break;
2024                 }
2025                 mutex_unlock(&local->work_mtx);
2026
2027                 /*
2028                  * If somebody requests authentication and we haven't
2029                  * sent out an auth frame yet there's no need to send
2030                  * out a deauth frame either. If the state was PROBE,
2031                  * then this is the case. If it's AUTH we have sent a
2032                  * frame, and if it's IDLE we have completed the auth
2033                  * process already.
2034                  */
2035                 if (not_auth_yet) {
2036                         __cfg80211_auth_canceled(sdata->dev, bssid);
2037                         return 0;
2038                 }
2039         }
2040
2041         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2042                sdata->name, bssid, req->reason_code);
2043
2044         ieee80211_send_deauth_disassoc(sdata, bssid,
2045                         IEEE80211_STYPE_DEAUTH, req->reason_code,
2046                         cookie);
2047
2048         ieee80211_recalc_idle(sdata->local);
2049
2050         return 0;
2051 }
2052
2053 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2054                            struct cfg80211_disassoc_request *req,
2055                            void *cookie)
2056 {
2057         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2058
2059         mutex_lock(&ifmgd->mtx);
2060
2061         /*
2062          * cfg80211 should catch this ... but it's racy since
2063          * we can receive a disassoc frame, process it, hand it
2064          * to cfg80211 while that's in a locked section already
2065          * trying to tell us that the user wants to disconnect.
2066          */
2067         if (ifmgd->associated != req->bss) {
2068                 mutex_unlock(&ifmgd->mtx);
2069                 return -ENOLINK;
2070         }
2071
2072         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2073                sdata->name, req->bss->bssid, req->reason_code);
2074
2075         ieee80211_set_disassoc(sdata);
2076
2077         mutex_unlock(&ifmgd->mtx);
2078
2079         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2080                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2081                         cookie);
2082
2083         ieee80211_recalc_idle(sdata->local);
2084
2085         return 0;
2086 }
2087
2088 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2089                          struct ieee80211_channel *chan,
2090                          enum nl80211_channel_type channel_type,
2091                          const u8 *buf, size_t len, u64 *cookie)
2092 {
2093         struct ieee80211_local *local = sdata->local;
2094         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2095         struct sk_buff *skb;
2096
2097         /* Check that we are on the requested channel for transmission */
2098         if ((chan != local->tmp_channel ||
2099              channel_type != local->tmp_channel_type) &&
2100             (chan != local->oper_channel ||
2101              channel_type != local->oper_channel_type))
2102                 return -EBUSY;
2103
2104         skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2105         if (!skb)
2106                 return -ENOMEM;
2107         skb_reserve(skb, local->hw.extra_tx_headroom);
2108
2109         memcpy(skb_put(skb, len), buf, len);
2110
2111         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2112                 IEEE80211_SKB_CB(skb)->flags |=
2113                         IEEE80211_TX_INTFL_DONT_ENCRYPT;
2114         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2115                 IEEE80211_TX_CTL_REQ_TX_STATUS;
2116         skb->dev = sdata->dev;
2117         ieee80211_tx_skb(sdata, skb);
2118
2119         *cookie = (unsigned long) skb;
2120         return 0;
2121 }