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_PS_NULLFUNC_STACK) &&
 440                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 441                         return;
 442
 443                 conf->flags |= IEEE80211_CONF_PS;
 444                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 445         }
 446 }
 447
 448 static void ieee80211_change_ps(struct ieee80211_local *local)
 449 {
 450         struct ieee80211_conf *conf = &local->hw.conf;
 451
 452         if (local->ps_sdata) {
 453                 ieee80211_enable_ps(local, local->ps_sdata);
 454         } else if (conf->flags & IEEE80211_CONF_PS) {
 455                 conf->flags &= ~IEEE80211_CONF_PS;
 456                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 457                 del_timer_sync(&local->dynamic_ps_timer);
 458                 cancel_work_sync(&local->dynamic_ps_enable_work);
 459         }
 460 }
 461
 462 /* need to hold RTNL or interface lock */
 463 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 464 {
 465         struct ieee80211_sub_if_data *sdata, *found = NULL;
 466         int count = 0;
 467
 468         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 469                 local->ps_sdata = NULL;
 470                 return;
 471         }
 472
 473         if (!list_empty(&local->work_list)) {
 474                 local->ps_sdata = NULL;
 475                 goto change;
 476         }
 477
 478         list_for_each_entry(sdata, &local->interfaces, list) {
 479                 if (!ieee80211_sdata_running(sdata))
 480                         continue;
 481                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 482                         continue;
 483                 found = sdata;
 484                 count++;
 485         }
 486
 487         if (count == 1 && found->u.mgd.powersave &&
 488             found->u.mgd.associated &&
 489             found->u.mgd.associated->beacon_ies &&
 490             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 491                                     IEEE80211_STA_CONNECTION_POLL))) {
 492                 s32 beaconint_us;
 493
 494                 if (latency < 0)
 495                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 496
 497                 beaconint_us = ieee80211_tu_to_usec(
 498                                         found->vif.bss_conf.beacon_int);
 499
 500                 if (beaconint_us > latency) {
 501                         local->ps_sdata = NULL;
 502                 } else {
 503                         struct ieee80211_bss *bss;
 504                         int maxslp = 1;
 505                         u8 dtimper;
 506
 507                         bss = (void *)found->u.mgd.associated->priv;
 508                         dtimper = bss->dtim_period;
 509
 510                         /* If the TIM IE is invalid, pretend the value is 1 */
 511                         if (!dtimper)
 512                                 dtimper = 1;
 513                         else if (dtimper > 1)
 514                                 maxslp = min_t(int, dtimper,
 515                                                     latency / beaconint_us);
 516
 517                         local->hw.conf.max_sleep_period = maxslp;
 518                         local->hw.conf.ps_dtim_period = dtimper;
 519                         local->ps_sdata = found;
 520                 }
 521         } else {
 522                 local->ps_sdata = NULL;
 523         }
 524
 525  change:
 526         ieee80211_change_ps(local);
 527 }
 528
 529 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 530 {
 531         struct ieee80211_local *local =
 532                 container_of(work, struct ieee80211_local,
 533                              dynamic_ps_disable_work);
 534
 535         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 536                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 537                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 538         }
 539
 540         ieee80211_wake_queues_by_reason(&local->hw,
 541                                         IEEE80211_QUEUE_STOP_REASON_PS);
 542 }
 543
 544 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 545 {
 546         struct ieee80211_local *local =
 547                 container_of(work, struct ieee80211_local,
 548                              dynamic_ps_enable_work);
 549         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 550         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 551
 552         /* can only happen when PS was just disabled anyway */
 553         if (!sdata)
 554                 return;
 555
 556         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 557                 return;
 558
 559         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 560             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 561                 ieee80211_send_nullfunc(local, sdata, 1);
 562
 563         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 564               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 565             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 566                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 567                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 568                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 569         }
 570 }
 571
 572 void ieee80211_dynamic_ps_timer(unsigned long data)
 573 {
 574         struct ieee80211_local *local = (void *) data;
 575
 576         if (local->quiescing || local->suspended)
 577                 return;
 578
 579         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 580 }
 581
 582 /* MLME */
 583 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 584                                      struct ieee80211_if_managed *ifmgd,
 585                                      u8 *wmm_param, size_t wmm_param_len)
 586 {
 587         struct ieee80211_tx_queue_params params;
 588         size_t left;
 589         int count;
 590         u8 *pos, uapsd_queues = 0;
 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) && local->ops->conf_tx)
 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
 673 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 674                                            u16 capab, bool erp_valid, u8 erp)
 675 {
 676         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 677         u32 changed = 0;
 678         bool use_protection;
 679         bool use_short_preamble;
 680         bool use_short_slot;
 681
 682         if (erp_valid) {
 683                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 684                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 685         } else {
 686                 use_protection = false;
 687                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 688         }
 689
 690         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 691         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 692                 use_short_slot = true;
 693
 694         if (use_protection != bss_conf->use_cts_prot) {
 695                 bss_conf->use_cts_prot = use_protection;
 696                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 697         }
 698
 699         if (use_short_preamble != bss_conf->use_short_preamble) {
 700                 bss_conf->use_short_preamble = use_short_preamble;
 701                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 702         }
 703
 704         if (use_short_slot != bss_conf->use_short_slot) {
 705                 bss_conf->use_short_slot = use_short_slot;
 706                 changed |= BSS_CHANGED_ERP_SLOT;
 707         }
 708
 709         return changed;
 710 }
 711
 712 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 713                                      struct cfg80211_bss *cbss,
 714                                      u32 bss_info_changed)
 715 {
 716         struct ieee80211_bss *bss = (void *)cbss->priv;
 717         struct ieee80211_local *local = sdata->local;
 718
 719         bss_info_changed |= BSS_CHANGED_ASSOC;
 720         /* set timing information */
 721         sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
 722         sdata->vif.bss_conf.timestamp = cbss->tsf;
 723
 724         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 725         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 726                 cbss->capability, bss->has_erp_value, bss->erp_value);
 727
 728         sdata->u.mgd.associated = cbss;
 729         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 730
 731         /* just to be sure */
 732         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 733                                 IEEE80211_STA_BEACON_POLL);
 734
 735         /*
 736          * Always handle WMM once after association regardless
 737          * of the first value the AP uses. Setting -1 here has
 738          * that effect because the AP values is an unsigned
 739          * 4-bit value.
 740          */
 741         sdata->u.mgd.wmm_last_param_set = -1;
 742
 743         ieee80211_led_assoc(local, 1);
 744
 745         sdata->vif.bss_conf.assoc = 1;
 746         /*
 747          * For now just always ask the driver to update the basic rateset
 748          * when we have associated, we aren't checking whether it actually
 749          * changed or not.
 750          */
 751         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 752
 753         /* And the BSSID changed - we're associated now */
 754         bss_info_changed |= BSS_CHANGED_BSSID;
 755
 756         /* Tell the driver to monitor connection quality (if supported) */
 757         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 758             sdata->vif.bss_conf.cqm_rssi_thold)
 759                 bss_info_changed |= BSS_CHANGED_CQM;
 760
 761         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 762
 763         mutex_lock(&local->iflist_mtx);
 764         ieee80211_recalc_ps(local, -1);
 765         ieee80211_recalc_smps(local, sdata);
 766         mutex_unlock(&local->iflist_mtx);
 767
 768         netif_tx_start_all_queues(sdata->dev);
 769         netif_carrier_on(sdata->dev);
 770 }
 771
 772 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
 773 {
 774         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 775         struct ieee80211_local *local = sdata->local;
 776         struct sta_info *sta;
 777         u32 changed = 0, config_changed = 0;
 778         u8 bssid[ETH_ALEN];
 779
 780         ASSERT_MGD_MTX(ifmgd);
 781
 782         if (WARN_ON(!ifmgd->associated))
 783                 return;
 784
 785         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 786
 787         ifmgd->associated = NULL;
 788         memset(ifmgd->bssid, 0, ETH_ALEN);
 789
 790         /*
 791          * we need to commit the associated = NULL change because the
 792          * scan code uses that to determine whether this iface should
 793          * go to/wake up from powersave or not -- and could otherwise
 794          * wake the queues erroneously.
 795          */
 796         smp_mb();
 797
 798         /*
 799          * Thus, we can only afterwards stop the queues -- to account
 800          * for the case where another CPU is finishing a scan at this
 801          * time -- we don't want the scan code to enable queues.
 802          */
 803
 804         netif_tx_stop_all_queues(sdata->dev);
 805         netif_carrier_off(sdata->dev);
 806
 807         rcu_read_lock();
 808         sta = sta_info_get(sdata, bssid);
 809         if (sta) {
 810                 set_sta_flags(sta, WLAN_STA_DISASSOC);
 811                 ieee80211_sta_tear_down_BA_sessions(sta);
 812         }
 813         rcu_read_unlock();
 814
 815         changed |= ieee80211_reset_erp_info(sdata);
 816
 817         ieee80211_led_assoc(local, 0);
 818         changed |= BSS_CHANGED_ASSOC;
 819         sdata->vif.bss_conf.assoc = false;
 820
 821         ieee80211_set_wmm_default(sdata);
 822
 823         /* channel(_type) changes are handled by ieee80211_hw_config */
 824         local->oper_channel_type = NL80211_CHAN_NO_HT;
 825
 826         /* on the next assoc, re-program HT parameters */
 827         sdata->ht_opmode_valid = false;
 828
 829         local->power_constr_level = 0;
 830
 831         del_timer_sync(&local->dynamic_ps_timer);
 832         cancel_work_sync(&local->dynamic_ps_enable_work);
 833
 834         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 835                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 836                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 837         }
 838
 839         ieee80211_hw_config(local, config_changed);
 840
 841         /* And the BSSID changed -- not very interesting here */
 842         changed |= BSS_CHANGED_BSSID;
 843         ieee80211_bss_info_change_notify(sdata, changed);
 844
 845         sta_info_destroy_addr(sdata, bssid);
 846 }
 847
 848 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 849                              struct ieee80211_hdr *hdr)
 850 {
 851         /*
 852          * We can postpone the mgd.timer whenever receiving unicast frames
 853          * from AP because we know that the connection is working both ways
 854          * at that time. But multicast frames (and hence also beacons) must
 855          * be ignored here, because we need to trigger the timer during
 856          * data idle periods for sending the periodic probe request to the
 857          * AP we're connected to.
 858          */
 859         if (is_multicast_ether_addr(hdr->addr1))
 860                 return;
 861
 862         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 863                 return;
 864
 865         mod_timer(&sdata->u.mgd.conn_mon_timer,
 866                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 867 }
 868
 869 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
 870 {
 871         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 872         const u8 *ssid;
 873
 874         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
 875         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
 876                                  ssid + 2, ssid[1], NULL, 0);
 877
 878         ifmgd->probe_send_count++;
 879         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
 880         run_again(ifmgd, ifmgd->probe_timeout);
 881 }
 882
 883 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
 884                                    bool beacon)
 885 {
 886         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 887         bool already = false;
 888
 889         if (!ieee80211_sdata_running(sdata))
 890                 return;
 891
 892         if (sdata->local->scanning)
 893                 return;
 894
 895         if (sdata->local->tmp_channel)
 896                 return;
 897
 898         mutex_lock(&ifmgd->mtx);
 899
 900         if (!ifmgd->associated)
 901                 goto out;
 902
 903 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 904         if (beacon && net_ratelimit())
 905                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
 906                        "- sending probe request\n", sdata->name);
 907 #endif
 908
 909         /*
 910          * The driver/our work has already reported this event or the
 911          * connection monitoring has kicked in and we have already sent
 912          * a probe request. Or maybe the AP died and the driver keeps
 913          * reporting until we disassociate...
 914          *
 915          * In either case we have to ignore the current call to this
 916          * function (except for setting the correct probe reason bit)
 917          * because otherwise we would reset the timer every time and
 918          * never check whether we received a probe response!
 919          */
 920         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 921                             IEEE80211_STA_CONNECTION_POLL))
 922                 already = true;
 923
 924         if (beacon)
 925                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
 926         else
 927                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
 928
 929         if (already)
 930                 goto out;
 931
 932         mutex_lock(&sdata->local->iflist_mtx);
 933         ieee80211_recalc_ps(sdata->local, -1);
 934         mutex_unlock(&sdata->local->iflist_mtx);
 935
 936         ifmgd->probe_send_count = 0;
 937         ieee80211_mgd_probe_ap_send(sdata);
 938  out:
 939         mutex_unlock(&ifmgd->mtx);
 940 }
 941
 942 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
 943 {
 944         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 945         struct ieee80211_local *local = sdata->local;
 946         u8 bssid[ETH_ALEN];
 947
 948         mutex_lock(&ifmgd->mtx);
 949         if (!ifmgd->associated) {
 950                 mutex_unlock(&ifmgd->mtx);
 951                 return;
 952         }
 953
 954         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 955
 956         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
 957
 958         ieee80211_set_disassoc(sdata);
 959         ieee80211_recalc_idle(local);
 960         mutex_unlock(&ifmgd->mtx);
 961         /*
 962          * must be outside lock due to cfg80211,
 963          * but that's not a problem.
 964          */
 965         ieee80211_send_deauth_disassoc(sdata, bssid,
 966                                        IEEE80211_STYPE_DEAUTH,
 967                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
 968                                        NULL);
 969 }
 970
 971 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
 972 {
 973         struct ieee80211_sub_if_data *sdata =
 974                 container_of(work, struct ieee80211_sub_if_data,
 975                              u.mgd.beacon_connection_loss_work);
 976
 977         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 978                 __ieee80211_connection_loss(sdata);
 979         else
 980                 ieee80211_mgd_probe_ap(sdata, true);
 981 }
 982
 983 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
 984 {
 985         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 986         struct ieee80211_hw *hw = &sdata->local->hw;
 987
 988         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
 989         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
 990 }
 991 EXPORT_SYMBOL(ieee80211_beacon_loss);
 992
 993 void ieee80211_connection_loss(struct ieee80211_vif *vif)
 994 {
 995         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 996         struct ieee80211_hw *hw = &sdata->local->hw;
 997
 998         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
 999         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1000 }
1001 EXPORT_SYMBOL(ieee80211_connection_loss);
1002
1003
1004 static enum rx_mgmt_action __must_check
1005 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1006                          struct ieee80211_mgmt *mgmt, size_t len)
1007 {
1008         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1009         const u8 *bssid = NULL;
1010         u16 reason_code;
1011
1012         if (len < 24 + 2)
1013                 return RX_MGMT_NONE;
1014
1015         ASSERT_MGD_MTX(ifmgd);
1016
1017         bssid = ifmgd->associated->bssid;
1018
1019         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1020
1021         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1022                         sdata->name, bssid, reason_code);
1023
1024         ieee80211_set_disassoc(sdata);
1025         ieee80211_recalc_idle(sdata->local);
1026
1027         return RX_MGMT_CFG80211_DEAUTH;
1028 }
1029
1030
1031 static enum rx_mgmt_action __must_check
1032 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1033                            struct ieee80211_mgmt *mgmt, size_t len)
1034 {
1035         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1036         u16 reason_code;
1037
1038         if (len < 24 + 2)
1039                 return RX_MGMT_NONE;
1040
1041         ASSERT_MGD_MTX(ifmgd);
1042
1043         if (WARN_ON(!ifmgd->associated))
1044                 return RX_MGMT_NONE;
1045
1046         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1047                 return RX_MGMT_NONE;
1048
1049         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1050
1051         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1052                         sdata->name, mgmt->sa, reason_code);
1053
1054         ieee80211_set_disassoc(sdata);
1055         ieee80211_recalc_idle(sdata->local);
1056         return RX_MGMT_CFG80211_DISASSOC;
1057 }
1058
1059
1060 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1061                                     struct ieee80211_mgmt *mgmt, size_t len)
1062 {
1063         struct ieee80211_sub_if_data *sdata = wk->sdata;
1064         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1065         struct ieee80211_local *local = sdata->local;
1066         struct ieee80211_supported_band *sband;
1067         struct sta_info *sta;
1068         struct cfg80211_bss *cbss = wk->assoc.bss;
1069         u8 *pos;
1070         u32 rates, basic_rates;
1071         u16 capab_info, aid;
1072         struct ieee802_11_elems elems;
1073         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1074         u32 changed = 0;
1075         int i, j, err;
1076         bool have_higher_than_11mbit = false;
1077         u16 ap_ht_cap_flags;
1078
1079         /* AssocResp and ReassocResp have identical structure */
1080
1081         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1082         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1083
1084         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1085                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1086                        "set\n", sdata->name, aid);
1087         aid &= ~(BIT(15) | BIT(14));
1088
1089         pos = mgmt->u.assoc_resp.variable;
1090         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1091
1092         if (!elems.supp_rates) {
1093                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1094                        sdata->name);
1095                 return false;
1096         }
1097
1098         ifmgd->aid = aid;
1099
1100         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1101         if (!sta) {
1102                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1103                        " the AP\n", sdata->name);
1104                 return false;
1105         }
1106
1107         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1108                            WLAN_STA_ASSOC_AP);
1109         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1110                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1111
1112         rates = 0;
1113         basic_rates = 0;
1114         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1115
1116         for (i = 0; i < elems.supp_rates_len; i++) {
1117                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1118                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1119
1120                 if (rate > 110)
1121                         have_higher_than_11mbit = true;
1122
1123                 for (j = 0; j < sband->n_bitrates; j++) {
1124                         if (sband->bitrates[j].bitrate == rate) {
1125                                 rates |= BIT(j);
1126                                 if (is_basic)
1127                                         basic_rates |= BIT(j);
1128                                 break;
1129                         }
1130                 }
1131         }
1132
1133         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1134                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1135                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1136
1137                 if (rate > 110)
1138                         have_higher_than_11mbit = true;
1139
1140                 for (j = 0; j < sband->n_bitrates; j++) {
1141                         if (sband->bitrates[j].bitrate == rate) {
1142                                 rates |= BIT(j);
1143                                 if (is_basic)
1144                                         basic_rates |= BIT(j);
1145                                 break;
1146                         }
1147                 }
1148         }
1149
1150         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1151         sdata->vif.bss_conf.basic_rates = basic_rates;
1152
1153         /* cf. IEEE 802.11 9.2.12 */
1154         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1155             have_higher_than_11mbit)
1156                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1157         else
1158                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1159
1160         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1161                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1162                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1163
1164         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1165
1166         rate_control_rate_init(sta);
1167
1168         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1169                 set_sta_flags(sta, WLAN_STA_MFP);
1170
1171         if (elems.wmm_param)
1172                 set_sta_flags(sta, WLAN_STA_WME);
1173
1174         err = sta_info_insert(sta);
1175         sta = NULL;
1176         if (err) {
1177                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1178                        " the AP (error %d)\n", sdata->name, err);
1179                 return false;
1180         }
1181
1182         if (elems.wmm_param)
1183                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1184                                          elems.wmm_param_len);
1185         else
1186                 ieee80211_set_wmm_default(sdata);
1187
1188         local->oper_channel = wk->chan;
1189
1190         if (elems.ht_info_elem && elems.wmm_param &&
1191             (sdata->local->hw.queues >= 4) &&
1192             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1193                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1194                                                cbss->bssid, ap_ht_cap_flags);
1195
1196         /* set AID and assoc capability,
1197          * ieee80211_set_associated() will tell the driver */
1198         bss_conf->aid = aid;
1199         bss_conf->assoc_capability = capab_info;
1200         ieee80211_set_associated(sdata, cbss, changed);
1201
1202         /*
1203          * If we're using 4-addr mode, let the AP know that we're
1204          * doing so, so that it can create the STA VLAN on its side
1205          */
1206         if (ifmgd->use_4addr)
1207                 ieee80211_send_4addr_nullfunc(local, sdata);
1208
1209         /*
1210          * Start timer to probe the connection to the AP now.
1211          * Also start the timer that will detect beacon loss.
1212          */
1213         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1214         mod_beacon_timer(sdata);
1215
1216         return true;
1217 }
1218
1219
1220 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1221                                   struct ieee80211_mgmt *mgmt,
1222                                   size_t len,
1223                                   struct ieee80211_rx_status *rx_status,
1224                                   struct ieee802_11_elems *elems,
1225                                   bool beacon)
1226 {
1227         struct ieee80211_local *local = sdata->local;
1228         int freq;
1229         struct ieee80211_bss *bss;
1230         struct ieee80211_channel *channel;
1231         bool need_ps = false;
1232
1233         if (sdata->u.mgd.associated) {
1234                 bss = (void *)sdata->u.mgd.associated->priv;
1235                 /* not previously set so we may need to recalc */
1236                 need_ps = !bss->dtim_period;
1237         }
1238
1239         if (elems->ds_params && elems->ds_params_len == 1)
1240                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1241         else
1242                 freq = rx_status->freq;
1243
1244         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1245
1246         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1247                 return;
1248
1249         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1250                                         channel, beacon);
1251         if (bss)
1252                 ieee80211_rx_bss_put(local, bss);
1253
1254         if (!sdata->u.mgd.associated)
1255                 return;
1256
1257         if (need_ps) {
1258                 mutex_lock(&local->iflist_mtx);
1259                 ieee80211_recalc_ps(local, -1);
1260                 mutex_unlock(&local->iflist_mtx);
1261         }
1262
1263         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1264             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1265                                                         ETH_ALEN) == 0)) {
1266                 struct ieee80211_channel_sw_ie *sw_elem =
1267                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1268                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1269         }
1270 }
1271
1272
1273 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1274                                          struct sk_buff *skb)
1275 {
1276         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1277         struct ieee80211_if_managed *ifmgd;
1278         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1279         size_t baselen, len = skb->len;
1280         struct ieee802_11_elems elems;
1281
1282         ifmgd = &sdata->u.mgd;
1283
1284         ASSERT_MGD_MTX(ifmgd);
1285
1286         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1287                 return; /* ignore ProbeResp to foreign address */
1288
1289         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1290         if (baselen > len)
1291                 return;
1292
1293         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1294                                 &elems);
1295
1296         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1297
1298         if (ifmgd->associated &&
1299             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1300             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1301                             IEEE80211_STA_CONNECTION_POLL)) {
1302                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1303                                   IEEE80211_STA_BEACON_POLL);
1304                 mutex_lock(&sdata->local->iflist_mtx);
1305                 ieee80211_recalc_ps(sdata->local, -1);
1306                 mutex_unlock(&sdata->local->iflist_mtx);
1307                 /*
1308                  * We've received a probe response, but are not sure whether
1309                  * we have or will be receiving any beacons or data, so let's
1310                  * schedule the timers again, just in case.
1311                  */
1312                 mod_beacon_timer(sdata);
1313                 mod_timer(&ifmgd->conn_mon_timer,
1314                           round_jiffies_up(jiffies +
1315                                            IEEE80211_CONNECTION_IDLE_TIME));
1316         }
1317 }
1318
1319 /*
1320  * This is the canonical list of information elements we care about,
1321  * the filter code also gives us all changes to the Microsoft OUI
1322  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1323  *
1324  * We implement beacon filtering in software since that means we can
1325  * avoid processing the frame here and in cfg80211, and userspace
1326  * will not be able to tell whether the hardware supports it or not.
1327  *
1328  * XXX: This list needs to be dynamic -- userspace needs to be able to
1329  *      add items it requires. It also needs to be able to tell us to
1330  *      look out for other vendor IEs.
1331  */
1332 static const u64 care_about_ies =
1333         (1ULL << WLAN_EID_COUNTRY) |
1334         (1ULL << WLAN_EID_ERP_INFO) |
1335         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1336         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1337         (1ULL << WLAN_EID_HT_CAPABILITY) |
1338         (1ULL << WLAN_EID_HT_INFORMATION);
1339
1340 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1341                                      struct ieee80211_mgmt *mgmt,
1342                                      size_t len,
1343                                      struct ieee80211_rx_status *rx_status)
1344 {
1345         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1346         size_t baselen;
1347         struct ieee802_11_elems elems;
1348         struct ieee80211_local *local = sdata->local;
1349         u32 changed = 0;
1350         bool erp_valid, directed_tim = false;
1351         u8 erp_value = 0;
1352         u32 ncrc;
1353         u8 *bssid;
1354
1355         ASSERT_MGD_MTX(ifmgd);
1356
1357         /* Process beacon from the current BSS */
1358         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1359         if (baselen > len)
1360                 return;
1361
1362         if (rx_status->freq != local->hw.conf.channel->center_freq)
1363                 return;
1364
1365         /*
1366          * We might have received a number of frames, among them a
1367          * disassoc frame and a beacon...
1368          */
1369         if (!ifmgd->associated)
1370                 return;
1371
1372         bssid = ifmgd->associated->bssid;
1373
1374         /*
1375          * And in theory even frames from a different AP we were just
1376          * associated to a split-second ago!
1377          */
1378         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1379                 return;
1380
1381         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1382 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1383                 if (net_ratelimit()) {
1384                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1385                                "to a received beacon\n", sdata->name);
1386                 }
1387 #endif
1388                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1389                 mutex_lock(&local->iflist_mtx);
1390                 ieee80211_recalc_ps(local, -1);
1391                 mutex_unlock(&local->iflist_mtx);
1392         }
1393
1394         /*
1395          * Push the beacon loss detection into the future since
1396          * we are processing a beacon from the AP just now.
1397          */
1398         mod_beacon_timer(sdata);
1399
1400         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1401         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1402                                           len - baselen, &elems,
1403                                           care_about_ies, ncrc);
1404
1405         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1406                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1407                                                    ifmgd->aid);
1408
1409         if (ncrc != ifmgd->beacon_crc) {
1410                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1411                                       true);
1412
1413                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1414                                          elems.wmm_param_len);
1415         }
1416
1417         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1418                 if (directed_tim) {
1419                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1420                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1421                                 ieee80211_hw_config(local,
1422                                                     IEEE80211_CONF_CHANGE_PS);
1423                                 ieee80211_send_nullfunc(local, sdata, 0);
1424                         } else {
1425                                 local->pspolling = true;
1426
1427                                 /*
1428                                  * Here is assumed that the driver will be
1429                                  * able to send ps-poll frame and receive a
1430                                  * response even though power save mode is
1431                                  * enabled, but some drivers might require
1432                                  * to disable power save here. This needs
1433                                  * to be investigated.
1434                                  */
1435                                 ieee80211_send_pspoll(local, sdata);
1436                         }
1437                 }
1438         }
1439
1440         if (ncrc == ifmgd->beacon_crc)
1441                 return;
1442         ifmgd->beacon_crc = ncrc;
1443
1444         if (elems.erp_info && elems.erp_info_len >= 1) {
1445                 erp_valid = true;
1446                 erp_value = elems.erp_info[0];
1447         } else {
1448                 erp_valid = false;
1449         }
1450         changed |= ieee80211_handle_bss_capability(sdata,
1451                         le16_to_cpu(mgmt->u.beacon.capab_info),
1452                         erp_valid, erp_value);
1453
1454
1455         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1456             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1457                 struct sta_info *sta;
1458                 struct ieee80211_supported_band *sband;
1459                 u16 ap_ht_cap_flags;
1460
1461                 rcu_read_lock();
1462
1463                 sta = sta_info_get(sdata, bssid);
1464                 if (WARN_ON(!sta)) {
1465                         rcu_read_unlock();
1466                         return;
1467                 }
1468
1469                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1470
1471                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1472                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1473
1474                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1475
1476                 rcu_read_unlock();
1477
1478                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1479                                                bssid, ap_ht_cap_flags);
1480         }
1481
1482         /* Note: country IE parsing is done for us by cfg80211 */
1483         if (elems.country_elem) {
1484                 /* TODO: IBSS also needs this */
1485                 if (elems.pwr_constr_elem)
1486                         ieee80211_handle_pwr_constr(sdata,
1487                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1488                                 elems.pwr_constr_elem,
1489                                 elems.pwr_constr_elem_len);
1490         }
1491
1492         ieee80211_bss_info_change_notify(sdata, changed);
1493 }
1494
1495 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1496                                           struct sk_buff *skb)
1497 {
1498         struct ieee80211_local *local = sdata->local;
1499         struct ieee80211_mgmt *mgmt;
1500         u16 fc;
1501
1502         if (skb->len < 24)
1503                 return RX_DROP_MONITOR;
1504
1505         mgmt = (struct ieee80211_mgmt *) skb->data;
1506         fc = le16_to_cpu(mgmt->frame_control);
1507
1508         switch (fc & IEEE80211_FCTL_STYPE) {
1509         case IEEE80211_STYPE_PROBE_RESP:
1510         case IEEE80211_STYPE_BEACON:
1511         case IEEE80211_STYPE_DEAUTH:
1512         case IEEE80211_STYPE_DISASSOC:
1513         case IEEE80211_STYPE_ACTION:
1514                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1515                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1516                 return RX_QUEUED;
1517         }
1518
1519         return RX_DROP_MONITOR;
1520 }
1521
1522 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1523                                          struct sk_buff *skb)
1524 {
1525         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1526         struct ieee80211_rx_status *rx_status;
1527         struct ieee80211_mgmt *mgmt;
1528         enum rx_mgmt_action rma = RX_MGMT_NONE;
1529         u16 fc;
1530
1531         rx_status = (struct ieee80211_rx_status *) skb->cb;
1532         mgmt = (struct ieee80211_mgmt *) skb->data;
1533         fc = le16_to_cpu(mgmt->frame_control);
1534
1535         mutex_lock(&ifmgd->mtx);
1536
1537         if (ifmgd->associated &&
1538             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1539                 switch (fc & IEEE80211_FCTL_STYPE) {
1540                 case IEEE80211_STYPE_BEACON:
1541                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1542                                                  rx_status);
1543                         break;
1544                 case IEEE80211_STYPE_PROBE_RESP:
1545                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1546                         break;
1547                 case IEEE80211_STYPE_DEAUTH:
1548                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1549                         break;
1550                 case IEEE80211_STYPE_DISASSOC:
1551                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1552                         break;
1553                 case IEEE80211_STYPE_ACTION:
1554                         if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1555                                 break;
1556
1557                         ieee80211_sta_process_chanswitch(sdata,
1558                                         &mgmt->u.action.u.chan_switch.sw_elem,
1559                                         (void *)ifmgd->associated->priv);
1560                         break;
1561                 }
1562                 mutex_unlock(&ifmgd->mtx);
1563
1564                 switch (rma) {
1565                 case RX_MGMT_NONE:
1566                         /* no action */
1567                         break;
1568                 case RX_MGMT_CFG80211_DEAUTH:
1569                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1570                         break;
1571                 case RX_MGMT_CFG80211_DISASSOC:
1572                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1573                         break;
1574                 default:
1575                         WARN(1, "unexpected: %d", rma);
1576                 }
1577                 goto out;
1578         }
1579
1580         mutex_unlock(&ifmgd->mtx);
1581
1582         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1583             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1584                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1585
1586  out:
1587         kfree_skb(skb);
1588 }
1589
1590 static void ieee80211_sta_timer(unsigned long data)
1591 {
1592         struct ieee80211_sub_if_data *sdata =
1593                 (struct ieee80211_sub_if_data *) data;
1594         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1595         struct ieee80211_local *local = sdata->local;
1596
1597         if (local->quiescing) {
1598                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1599                 return;
1600         }
1601
1602         ieee80211_queue_work(&local->hw, &ifmgd->work);
1603 }
1604
1605 static void ieee80211_sta_work(struct work_struct *work)
1606 {
1607         struct ieee80211_sub_if_data *sdata =
1608                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1609         struct ieee80211_local *local = sdata->local;
1610         struct ieee80211_if_managed *ifmgd;
1611         struct sk_buff *skb;
1612
1613         if (!ieee80211_sdata_running(sdata))
1614                 return;
1615
1616         if (local->scanning)
1617                 return;
1618
1619         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1620                 return;
1621
1622         /*
1623          * ieee80211_queue_work() should have picked up most cases,
1624          * here we'll pick the the rest.
1625          */
1626         if (WARN(local->suspended, "STA MLME work scheduled while "
1627                  "going to suspend\n"))
1628                 return;
1629
1630         ifmgd = &sdata->u.mgd;
1631
1632         /* first process frames to avoid timing out while a frame is pending */
1633         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1634                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1635
1636         /* then process the rest of the work */
1637         mutex_lock(&ifmgd->mtx);
1638
1639         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1640                             IEEE80211_STA_CONNECTION_POLL) &&
1641             ifmgd->associated) {
1642                 u8 bssid[ETH_ALEN];
1643
1644                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1645                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1646                         run_again(ifmgd, ifmgd->probe_timeout);
1647
1648                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1649 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1650                         printk(KERN_DEBUG "No probe response from AP %pM"
1651                                 " after %dms, try %d\n", bssid,
1652                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1653                                 ifmgd->probe_send_count);
1654 #endif
1655                         ieee80211_mgd_probe_ap_send(sdata);
1656                 } else {
1657                         /*
1658                          * We actually lost the connection ... or did we?
1659                          * Let's make sure!
1660                          */
1661                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1662                                           IEEE80211_STA_BEACON_POLL);
1663                         printk(KERN_DEBUG "No probe response from AP %pM"
1664                                 " after %dms, disconnecting.\n",
1665                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1666                         ieee80211_set_disassoc(sdata);
1667                         ieee80211_recalc_idle(local);
1668                         mutex_unlock(&ifmgd->mtx);
1669                         /*
1670                          * must be outside lock due to cfg80211,
1671                          * but that's not a problem.
1672                          */
1673                         ieee80211_send_deauth_disassoc(sdata, bssid,
1674                                         IEEE80211_STYPE_DEAUTH,
1675                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1676                                         NULL);
1677                         mutex_lock(&ifmgd->mtx);
1678                 }
1679         }
1680
1681         mutex_unlock(&ifmgd->mtx);
1682 }
1683
1684 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1685 {
1686         struct ieee80211_sub_if_data *sdata =
1687                 (struct ieee80211_sub_if_data *) data;
1688         struct ieee80211_local *local = sdata->local;
1689
1690         if (local->quiescing)
1691                 return;
1692
1693         ieee80211_queue_work(&sdata->local->hw,
1694                              &sdata->u.mgd.beacon_connection_loss_work);
1695 }
1696
1697 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1698 {
1699         struct ieee80211_sub_if_data *sdata =
1700                 (struct ieee80211_sub_if_data *) data;
1701         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1702         struct ieee80211_local *local = sdata->local;
1703
1704         if (local->quiescing)
1705                 return;
1706
1707         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1708 }
1709
1710 static void ieee80211_sta_monitor_work(struct work_struct *work)
1711 {
1712         struct ieee80211_sub_if_data *sdata =
1713                 container_of(work, struct ieee80211_sub_if_data,
1714                              u.mgd.monitor_work);
1715
1716         ieee80211_mgd_probe_ap(sdata, false);
1717 }
1718
1719 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1720 {
1721         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1722                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1723                                         IEEE80211_STA_CONNECTION_POLL);
1724
1725                 /* let's probe the connection once */
1726                 ieee80211_queue_work(&sdata->local->hw,
1727                            &sdata->u.mgd.monitor_work);
1728                 /* and do all the other regular work too */
1729                 ieee80211_queue_work(&sdata->local->hw,
1730                            &sdata->u.mgd.work);
1731         }
1732 }
1733
1734 #ifdef CONFIG_PM
1735 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1736 {
1737         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1738
1739         /*
1740          * we need to use atomic bitops for the running bits
1741          * only because both timers might fire at the same
1742          * time -- the code here is properly synchronised.
1743          */
1744
1745         cancel_work_sync(&ifmgd->work);
1746         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1747         if (del_timer_sync(&ifmgd->timer))
1748                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1749
1750         cancel_work_sync(&ifmgd->chswitch_work);
1751         if (del_timer_sync(&ifmgd->chswitch_timer))
1752                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1753
1754         cancel_work_sync(&ifmgd->monitor_work);
1755         /* these will just be re-established on connection */
1756         del_timer_sync(&ifmgd->conn_mon_timer);
1757         del_timer_sync(&ifmgd->bcn_mon_timer);
1758 }
1759
1760 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1761 {
1762         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1763
1764         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1765                 add_timer(&ifmgd->timer);
1766         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1767                 add_timer(&ifmgd->chswitch_timer);
1768 }
1769 #endif
1770
1771 /* interface setup */
1772 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1773 {
1774         struct ieee80211_if_managed *ifmgd;
1775
1776         ifmgd = &sdata->u.mgd;
1777         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1778         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1779         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1780         INIT_WORK(&ifmgd->beacon_connection_loss_work,
1781                   ieee80211_beacon_connection_loss_work);
1782         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1783                     (unsigned long) sdata);
1784         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1785                     (unsigned long) sdata);
1786         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1787                     (unsigned long) sdata);
1788         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1789                     (unsigned long) sdata);
1790         skb_queue_head_init(&ifmgd->skb_queue);
1791
1792         ifmgd->flags = 0;
1793
1794         mutex_init(&ifmgd->mtx);
1795
1796         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1797                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1798         else
1799                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1800 }
1801
1802 /* scan finished notification */
1803 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1804 {
1805         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1806
1807         /* Restart STA timers */
1808         rcu_read_lock();
1809         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1810                 ieee80211_restart_sta_timer(sdata);
1811         rcu_read_unlock();
1812 }
1813
1814 int ieee80211_max_network_latency(struct notifier_block *nb,
1815                                   unsigned long data, void *dummy)
1816 {
1817         s32 latency_usec = (s32) data;
1818         struct ieee80211_local *local =
1819                 container_of(nb, struct ieee80211_local,
1820                              network_latency_notifier);
1821
1822         mutex_lock(&local->iflist_mtx);
1823         ieee80211_recalc_ps(local, latency_usec);
1824         mutex_unlock(&local->iflist_mtx);
1825
1826         return 0;
1827 }
1828
1829 /* config hooks */
1830 static enum work_done_result
1831 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1832                           struct sk_buff *skb)
1833 {
1834         if (!skb) {
1835                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1836                 return WORK_DONE_DESTROY;
1837         }
1838
1839         if (wk->type == IEEE80211_WORK_AUTH) {
1840                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1841                 return WORK_DONE_DESTROY;
1842         }
1843
1844         mutex_lock(&wk->sdata->u.mgd.mtx);
1845         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1846         mutex_unlock(&wk->sdata->u.mgd.mtx);
1847
1848         wk->type = IEEE80211_WORK_AUTH;
1849         wk->probe_auth.tries = 0;
1850         return WORK_DONE_REQUEUE;
1851 }
1852
1853 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1854                        struct cfg80211_auth_request *req)
1855 {
1856         const u8 *ssid;
1857         struct ieee80211_work *wk;
1858         u16 auth_alg;
1859
1860         switch (req->auth_type) {
1861         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1862                 auth_alg = WLAN_AUTH_OPEN;
1863                 break;
1864         case NL80211_AUTHTYPE_SHARED_KEY:
1865                 auth_alg = WLAN_AUTH_SHARED_KEY;
1866                 break;
1867         case NL80211_AUTHTYPE_FT:
1868                 auth_alg = WLAN_AUTH_FT;
1869                 break;
1870         case NL80211_AUTHTYPE_NETWORK_EAP:
1871                 auth_alg = WLAN_AUTH_LEAP;
1872                 break;
1873         default:
1874                 return -EOPNOTSUPP;
1875         }
1876
1877         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1878         if (!wk)
1879                 return -ENOMEM;
1880
1881         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1882
1883         if (req->ie && req->ie_len) {
1884                 memcpy(wk->ie, req->ie, req->ie_len);
1885                 wk->ie_len = req->ie_len;
1886         }
1887
1888         if (req->key && req->key_len) {
1889                 wk->probe_auth.key_len = req->key_len;
1890                 wk->probe_auth.key_idx = req->key_idx;
1891                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1892         }
1893
1894         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1895         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1896         wk->probe_auth.ssid_len = ssid[1];
1897
1898         wk->probe_auth.algorithm = auth_alg;
1899         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1900
1901         /* if we already have a probe, don't probe again */
1902         if (req->bss->proberesp_ies)
1903                 wk->type = IEEE80211_WORK_AUTH;
1904         else
1905                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1906         wk->chan = req->bss->channel;
1907         wk->sdata = sdata;
1908         wk->done = ieee80211_probe_auth_done;
1909
1910         ieee80211_add_work(wk);
1911         return 0;
1912 }
1913
1914 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1915                                                   struct sk_buff *skb)
1916 {
1917         struct ieee80211_mgmt *mgmt;
1918         u16 status;
1919
1920         if (!skb) {
1921                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1922                 return WORK_DONE_DESTROY;
1923         }
1924
1925         mgmt = (void *)skb->data;
1926         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1927
1928         if (status == WLAN_STATUS_SUCCESS) {
1929                 mutex_lock(&wk->sdata->u.mgd.mtx);
1930                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1931                         mutex_unlock(&wk->sdata->u.mgd.mtx);
1932                         /* oops -- internal error -- send timeout for now */
1933                         cfg80211_send_assoc_timeout(wk->sdata->dev,
1934                                                     wk->filter_ta);
1935                         return WORK_DONE_DESTROY;
1936                 }
1937                 mutex_unlock(&wk->sdata->u.mgd.mtx);
1938         }
1939
1940         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1941         return WORK_DONE_DESTROY;
1942 }
1943
1944 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1945                         struct cfg80211_assoc_request *req)
1946 {
1947         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1948         struct ieee80211_bss *bss = (void *)req->bss->priv;
1949         struct ieee80211_work *wk;
1950         const u8 *ssid;
1951         int i;
1952
1953         mutex_lock(&ifmgd->mtx);
1954         if (ifmgd->associated) {
1955                 if (!req->prev_bssid ||
1956                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
1957                            ETH_ALEN)) {
1958                         /*
1959                          * We are already associated and the request was not a
1960                          * reassociation request from the current BSS, so
1961                          * reject it.
1962                          */
1963                         mutex_unlock(&ifmgd->mtx);
1964                         return -EALREADY;
1965                 }
1966
1967                 /* Trying to reassociate - clear previous association state */
1968                 ieee80211_set_disassoc(sdata);
1969         }
1970         mutex_unlock(&ifmgd->mtx);
1971
1972         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1973         if (!wk)
1974                 return -ENOMEM;
1975
1976         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
1977         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1978
1979         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
1980                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
1981                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
1982                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
1983                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
1984
1985
1986         if (req->ie && req->ie_len) {
1987                 memcpy(wk->ie, req->ie, req->ie_len);
1988                 wk->ie_len = req->ie_len;
1989         } else
1990                 wk->ie_len = 0;
1991
1992         wk->assoc.bss = req->bss;
1993
1994         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1995
1996         /* new association always uses requested smps mode */
1997         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
1998                 if (ifmgd->powersave)
1999                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2000                 else
2001                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2002         } else
2003                 ifmgd->ap_smps = ifmgd->req_smps;
2004
2005         wk->assoc.smps = ifmgd->ap_smps;
2006         /*
2007          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2008          * We still associate in non-HT mode (11a/b/g) if any one of these
2009          * ciphers is configured as pairwise.
2010          * We can set this to true for non-11n hardware, that'll be checked
2011          * separately along with the peer capabilities.
2012          */
2013         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2014         wk->assoc.capability = req->bss->capability;
2015         wk->assoc.wmm_used = bss->wmm_used;
2016         wk->assoc.supp_rates = bss->supp_rates;
2017         wk->assoc.supp_rates_len = bss->supp_rates_len;
2018         wk->assoc.ht_information_ie =
2019                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2020
2021         if (bss->wmm_used && bss->uapsd_supported &&
2022             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2023                 wk->assoc.uapsd_used = true;
2024                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2025         } else {
2026                 wk->assoc.uapsd_used = false;
2027                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2028         }
2029
2030         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2031         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2032         wk->assoc.ssid_len = ssid[1];
2033
2034         if (req->prev_bssid)
2035                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2036
2037         wk->type = IEEE80211_WORK_ASSOC;
2038         wk->chan = req->bss->channel;
2039         wk->sdata = sdata;
2040         wk->done = ieee80211_assoc_done;
2041
2042         if (req->use_mfp) {
2043                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2044                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2045         } else {
2046                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2047                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2048         }
2049
2050         if (req->crypto.control_port)
2051                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2052         else
2053                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2054
2055         ieee80211_add_work(wk);
2056         return 0;
2057 }
2058
2059 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2060                          struct cfg80211_deauth_request *req,
2061                          void *cookie)
2062 {
2063         struct ieee80211_local *local = sdata->local;
2064         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2065         struct ieee80211_work *wk;
2066         const u8 *bssid = req->bss->bssid;
2067
2068         mutex_lock(&ifmgd->mtx);
2069
2070         if (ifmgd->associated == req->bss) {
2071                 bssid = req->bss->bssid;
2072                 ieee80211_set_disassoc(sdata);
2073                 mutex_unlock(&ifmgd->mtx);
2074         } else {
2075                 bool not_auth_yet = false;
2076
2077                 mutex_unlock(&ifmgd->mtx);
2078
2079                 mutex_lock(&local->work_mtx);
2080                 list_for_each_entry(wk, &local->work_list, list) {
2081                         if (wk->sdata != sdata)
2082                                 continue;
2083
2084                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2085                             wk->type != IEEE80211_WORK_AUTH)
2086                                 continue;
2087
2088                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2089                                 continue;
2090
2091                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2092                         list_del_rcu(&wk->list);
2093                         free_work(wk);
2094                         break;
2095                 }
2096                 mutex_unlock(&local->work_mtx);
2097
2098                 /*
2099                  * If somebody requests authentication and we haven't
2100                  * sent out an auth frame yet there's no need to send
2101                  * out a deauth frame either. If the state was PROBE,
2102                  * then this is the case. If it's AUTH we have sent a
2103                  * frame, and if it's IDLE we have completed the auth
2104                  * process already.
2105                  */
2106                 if (not_auth_yet) {
2107                         __cfg80211_auth_canceled(sdata->dev, bssid);
2108                         return 0;
2109                 }
2110         }
2111
2112         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2113                sdata->name, bssid, req->reason_code);
2114
2115         ieee80211_send_deauth_disassoc(sdata, bssid,
2116                         IEEE80211_STYPE_DEAUTH, req->reason_code,
2117                         cookie);
2118
2119         ieee80211_recalc_idle(sdata->local);
2120
2121         return 0;
2122 }
2123
2124 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2125                            struct cfg80211_disassoc_request *req,
2126                            void *cookie)
2127 {
2128         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2129
2130         mutex_lock(&ifmgd->mtx);
2131
2132         /*
2133          * cfg80211 should catch this ... but it's racy since
2134          * we can receive a disassoc frame, process it, hand it
2135          * to cfg80211 while that's in a locked section already
2136          * trying to tell us that the user wants to disconnect.
2137          */
2138         if (ifmgd->associated != req->bss) {
2139                 mutex_unlock(&ifmgd->mtx);
2140                 return -ENOLINK;
2141         }
2142
2143         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2144                sdata->name, req->bss->bssid, req->reason_code);
2145
2146         ieee80211_set_disassoc(sdata);
2147
2148         mutex_unlock(&ifmgd->mtx);
2149
2150         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2151                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2152                         cookie);
2153
2154         ieee80211_recalc_idle(sdata->local);
2155
2156         return 0;
2157 }
2158
2159 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2160                          struct ieee80211_channel *chan,
2161                          enum nl80211_channel_type channel_type,
2162                          const u8 *buf, size_t len, u64 *cookie)
2163 {
2164         struct ieee80211_local *local = sdata->local;
2165         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2166         struct sk_buff *skb;
2167
2168         /* Check that we are on the requested channel for transmission */
2169         if ((chan != local->tmp_channel ||
2170              channel_type != local->tmp_channel_type) &&
2171             (chan != local->oper_channel ||
2172              channel_type != local->oper_channel_type))
2173                 return -EBUSY;
2174
2175         skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2176         if (!skb)
2177                 return -ENOMEM;
2178         skb_reserve(skb, local->hw.extra_tx_headroom);
2179
2180         memcpy(skb_put(skb, len), buf, len);
2181
2182         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2183                 IEEE80211_SKB_CB(skb)->flags |=
2184                         IEEE80211_TX_INTFL_DONT_ENCRYPT;
2185         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2186                 IEEE80211_TX_CTL_REQ_TX_STATUS;
2187         skb->dev = sdata->dev;
2188         ieee80211_tx_skb(sdata, skb);
2189
2190         *cookie = (unsigned long) skb;
2191         return 0;
2192 }
2193
2194 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2195                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2196                                gfp_t gfp)
2197 {
2198         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2199
2200         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2201 }
2202 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);