net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <[email protected]>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <[email protected]>
   7  * Copyright 2007, Michael Wu <[email protected]>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/pm_qos_params.h>
  21 #include <linux/crc32.h>
  22 #include <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         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 757
 758         mutex_lock(&local->iflist_mtx);
 759         ieee80211_recalc_ps(local, -1);
 760         ieee80211_recalc_smps(local, sdata);
 761         mutex_unlock(&local->iflist_mtx);
 762
 763         netif_tx_start_all_queues(sdata->dev);
 764         netif_carrier_on(sdata->dev);
 765 }
 766
 767 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
 768 {
 769         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 770         struct ieee80211_local *local = sdata->local;
 771         struct sta_info *sta;
 772         u32 changed = 0, config_changed = 0;
 773         u8 bssid[ETH_ALEN];
 774
 775         ASSERT_MGD_MTX(ifmgd);
 776
 777         if (WARN_ON(!ifmgd->associated))
 778                 return;
 779
 780         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 781
 782         ifmgd->associated = NULL;
 783         memset(ifmgd->bssid, 0, ETH_ALEN);
 784
 785         /*
 786          * we need to commit the associated = NULL change because the
 787          * scan code uses that to determine whether this iface should
 788          * go to/wake up from powersave or not -- and could otherwise
 789          * wake the queues erroneously.
 790          */
 791         smp_mb();
 792
 793         /*
 794          * Thus, we can only afterwards stop the queues -- to account
 795          * for the case where another CPU is finishing a scan at this
 796          * time -- we don't want the scan code to enable queues.
 797          */
 798
 799         netif_tx_stop_all_queues(sdata->dev);
 800         netif_carrier_off(sdata->dev);
 801
 802         rcu_read_lock();
 803         sta = sta_info_get(sdata, bssid);
 804         if (sta) {
 805                 set_sta_flags(sta, WLAN_STA_DISASSOC);
 806                 ieee80211_sta_tear_down_BA_sessions(sta);
 807         }
 808         rcu_read_unlock();
 809
 810         changed |= ieee80211_reset_erp_info(sdata);
 811
 812         ieee80211_led_assoc(local, 0);
 813         changed |= BSS_CHANGED_ASSOC;
 814         sdata->vif.bss_conf.assoc = false;
 815
 816         ieee80211_set_wmm_default(sdata);
 817
 818         /* channel(_type) changes are handled by ieee80211_hw_config */
 819         local->oper_channel_type = NL80211_CHAN_NO_HT;
 820
 821         /* on the next assoc, re-program HT parameters */
 822         sdata->ht_opmode_valid = false;
 823
 824         local->power_constr_level = 0;
 825
 826         del_timer_sync(&local->dynamic_ps_timer);
 827         cancel_work_sync(&local->dynamic_ps_enable_work);
 828
 829         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 830                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 831                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 832         }
 833
 834         ieee80211_hw_config(local, config_changed);
 835
 836         /* And the BSSID changed -- not very interesting here */
 837         changed |= BSS_CHANGED_BSSID;
 838         ieee80211_bss_info_change_notify(sdata, changed);
 839
 840         sta_info_destroy_addr(sdata, bssid);
 841 }
 842
 843 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 844                              struct ieee80211_hdr *hdr)
 845 {
 846         /*
 847          * We can postpone the mgd.timer whenever receiving unicast frames
 848          * from AP because we know that the connection is working both ways
 849          * at that time. But multicast frames (and hence also beacons) must
 850          * be ignored here, because we need to trigger the timer during
 851          * data idle periods for sending the periodic probe request to the
 852          * AP we're connected to.
 853          */
 854         if (is_multicast_ether_addr(hdr->addr1))
 855                 return;
 856
 857         mod_timer(&sdata->u.mgd.conn_mon_timer,
 858                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 859 }
 860
 861 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
 862 {
 863         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 864         const u8 *ssid;
 865
 866         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
 867         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
 868                                  ssid + 2, ssid[1], NULL, 0);
 869
 870         ifmgd->probe_send_count++;
 871         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
 872         run_again(ifmgd, ifmgd->probe_timeout);
 873 }
 874
 875 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
 876                                    bool beacon)
 877 {
 878         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 879         bool already = false;
 880
 881         if (!ieee80211_sdata_running(sdata))
 882                 return;
 883
 884         if (sdata->local->scanning)
 885                 return;
 886
 887         if (sdata->local->tmp_channel)
 888                 return;
 889
 890         mutex_lock(&ifmgd->mtx);
 891
 892         if (!ifmgd->associated)
 893                 goto out;
 894
 895 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 896         if (beacon && net_ratelimit())
 897                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
 898                        "- sending probe request\n", sdata->name);
 899 #endif
 900
 901         /*
 902          * The driver/our work has already reported this event or the
 903          * connection monitoring has kicked in and we have already sent
 904          * a probe request. Or maybe the AP died and the driver keeps
 905          * reporting until we disassociate...
 906          *
 907          * In either case we have to ignore the current call to this
 908          * function (except for setting the correct probe reason bit)
 909          * because otherwise we would reset the timer every time and
 910          * never check whether we received a probe response!
 911          */
 912         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 913                             IEEE80211_STA_CONNECTION_POLL))
 914                 already = true;
 915
 916         if (beacon)
 917                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
 918         else
 919                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
 920
 921         if (already)
 922                 goto out;
 923
 924         mutex_lock(&sdata->local->iflist_mtx);
 925         ieee80211_recalc_ps(sdata->local, -1);
 926         mutex_unlock(&sdata->local->iflist_mtx);
 927
 928         ifmgd->probe_send_count = 0;
 929         ieee80211_mgd_probe_ap_send(sdata);
 930  out:
 931         mutex_unlock(&ifmgd->mtx);
 932 }
 933
 934 void ieee80211_beacon_loss_work(struct work_struct *work)
 935 {
 936         struct ieee80211_sub_if_data *sdata =
 937                 container_of(work, struct ieee80211_sub_if_data,
 938                              u.mgd.beacon_loss_work);
 939
 940         ieee80211_mgd_probe_ap(sdata, true);
 941 }
 942
 943 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
 944 {
 945         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 946
 947         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
 948 }
 949 EXPORT_SYMBOL(ieee80211_beacon_loss);
 950
 951 static enum rx_mgmt_action __must_check
 952 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
 953                          struct ieee80211_mgmt *mgmt, size_t len)
 954 {
 955         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 956         const u8 *bssid = NULL;
 957         u16 reason_code;
 958
 959         if (len < 24 + 2)
 960                 return RX_MGMT_NONE;
 961
 962         ASSERT_MGD_MTX(ifmgd);
 963
 964         bssid = ifmgd->associated->bssid;
 965
 966         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
 967
 968         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
 969                         sdata->name, bssid, reason_code);
 970
 971         ieee80211_set_disassoc(sdata);
 972         ieee80211_recalc_idle(sdata->local);
 973
 974         return RX_MGMT_CFG80211_DEAUTH;
 975 }
 976
 977
 978 static enum rx_mgmt_action __must_check
 979 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
 980                            struct ieee80211_mgmt *mgmt, size_t len)
 981 {
 982         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 983         u16 reason_code;
 984
 985         if (len < 24 + 2)
 986                 return RX_MGMT_NONE;
 987
 988         ASSERT_MGD_MTX(ifmgd);
 989
 990         if (WARN_ON(!ifmgd->associated))
 991                 return RX_MGMT_NONE;
 992
 993         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
 994                 return RX_MGMT_NONE;
 995
 996         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
 997
 998         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
 999                         sdata->name, mgmt->sa, reason_code);
1000
1001         ieee80211_set_disassoc(sdata);
1002         ieee80211_recalc_idle(sdata->local);
1003         return RX_MGMT_CFG80211_DISASSOC;
1004 }
1005
1006
1007 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1008                                     struct ieee80211_mgmt *mgmt, size_t len)
1009 {
1010         struct ieee80211_sub_if_data *sdata = wk->sdata;
1011         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1012         struct ieee80211_local *local = sdata->local;
1013         struct ieee80211_supported_band *sband;
1014         struct sta_info *sta;
1015         struct cfg80211_bss *cbss = wk->assoc.bss;
1016         u8 *pos;
1017         u32 rates, basic_rates;
1018         u16 capab_info, aid;
1019         struct ieee802_11_elems elems;
1020         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1021         u32 changed = 0;
1022         int i, j, err;
1023         bool have_higher_than_11mbit = false;
1024         u16 ap_ht_cap_flags;
1025
1026         /* AssocResp and ReassocResp have identical structure */
1027
1028         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1029         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1030
1031         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1032                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1033                        "set\n", sdata->name, aid);
1034         aid &= ~(BIT(15) | BIT(14));
1035
1036         pos = mgmt->u.assoc_resp.variable;
1037         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1038
1039         if (!elems.supp_rates) {
1040                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1041                        sdata->name);
1042                 return false;
1043         }
1044
1045         ifmgd->aid = aid;
1046
1047         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1048         if (!sta) {
1049                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1050                        " the AP\n", sdata->name);
1051                 return false;
1052         }
1053
1054         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1055                            WLAN_STA_ASSOC_AP);
1056         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1057                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1058
1059         rates = 0;
1060         basic_rates = 0;
1061         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1062
1063         for (i = 0; i < elems.supp_rates_len; i++) {
1064                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1065                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1066
1067                 if (rate > 110)
1068                         have_higher_than_11mbit = true;
1069
1070                 for (j = 0; j < sband->n_bitrates; j++) {
1071                         if (sband->bitrates[j].bitrate == rate) {
1072                                 rates |= BIT(j);
1073                                 if (is_basic)
1074                                         basic_rates |= BIT(j);
1075                                 break;
1076                         }
1077                 }
1078         }
1079
1080         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1081                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1082                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1083
1084                 if (rate > 110)
1085                         have_higher_than_11mbit = true;
1086
1087                 for (j = 0; j < sband->n_bitrates; j++) {
1088                         if (sband->bitrates[j].bitrate == rate) {
1089                                 rates |= BIT(j);
1090                                 if (is_basic)
1091                                         basic_rates |= BIT(j);
1092                                 break;
1093                         }
1094                 }
1095         }
1096
1097         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1098         sdata->vif.bss_conf.basic_rates = basic_rates;
1099
1100         /* cf. IEEE 802.11 9.2.12 */
1101         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1102             have_higher_than_11mbit)
1103                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1104         else
1105                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1106
1107         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1108                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1109                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1110
1111         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1112
1113         rate_control_rate_init(sta);
1114
1115         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1116                 set_sta_flags(sta, WLAN_STA_MFP);
1117
1118         if (elems.wmm_param)
1119                 set_sta_flags(sta, WLAN_STA_WME);
1120
1121         err = sta_info_insert(sta);
1122         sta = NULL;
1123         if (err) {
1124                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1125                        " the AP (error %d)\n", sdata->name, err);
1126                 return false;
1127         }
1128
1129         if (elems.wmm_param)
1130                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1131                                          elems.wmm_param_len);
1132         else
1133                 ieee80211_set_wmm_default(sdata);
1134
1135         local->oper_channel = wk->chan;
1136
1137         if (elems.ht_info_elem && elems.wmm_param &&
1138             (sdata->local->hw.queues >= 4) &&
1139             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1140                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1141                                                cbss->bssid, ap_ht_cap_flags);
1142
1143         /* set AID and assoc capability,
1144          * ieee80211_set_associated() will tell the driver */
1145         bss_conf->aid = aid;
1146         bss_conf->assoc_capability = capab_info;
1147         ieee80211_set_associated(sdata, cbss, changed);
1148
1149         /*
1150          * If we're using 4-addr mode, let the AP know that we're
1151          * doing so, so that it can create the STA VLAN on its side
1152          */
1153         if (ifmgd->use_4addr)
1154                 ieee80211_send_4addr_nullfunc(local, sdata);
1155
1156         /*
1157          * Start timer to probe the connection to the AP now.
1158          * Also start the timer that will detect beacon loss.
1159          */
1160         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1161         mod_beacon_timer(sdata);
1162
1163         return true;
1164 }
1165
1166
1167 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1168                                   struct ieee80211_mgmt *mgmt,
1169                                   size_t len,
1170                                   struct ieee80211_rx_status *rx_status,
1171                                   struct ieee802_11_elems *elems,
1172                                   bool beacon)
1173 {
1174         struct ieee80211_local *local = sdata->local;
1175         int freq;
1176         struct ieee80211_bss *bss;
1177         struct ieee80211_channel *channel;
1178         bool need_ps = false;
1179
1180         if (sdata->u.mgd.associated) {
1181                 bss = (void *)sdata->u.mgd.associated->priv;
1182                 /* not previously set so we may need to recalc */
1183                 need_ps = !bss->dtim_period;
1184         }
1185
1186         if (elems->ds_params && elems->ds_params_len == 1)
1187                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1188         else
1189                 freq = rx_status->freq;
1190
1191         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1192
1193         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1194                 return;
1195
1196         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1197                                         channel, beacon);
1198         if (bss)
1199                 ieee80211_rx_bss_put(local, bss);
1200
1201         if (!sdata->u.mgd.associated)
1202                 return;
1203
1204         if (need_ps) {
1205                 mutex_lock(&local->iflist_mtx);
1206                 ieee80211_recalc_ps(local, -1);
1207                 mutex_unlock(&local->iflist_mtx);
1208         }
1209
1210         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1211             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1212                                                         ETH_ALEN) == 0)) {
1213                 struct ieee80211_channel_sw_ie *sw_elem =
1214                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1215                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1216         }
1217 }
1218
1219
1220 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1221                                          struct sk_buff *skb)
1222 {
1223         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1224         struct ieee80211_if_managed *ifmgd;
1225         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1226         size_t baselen, len = skb->len;
1227         struct ieee802_11_elems elems;
1228
1229         ifmgd = &sdata->u.mgd;
1230
1231         ASSERT_MGD_MTX(ifmgd);
1232
1233         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1234                 return; /* ignore ProbeResp to foreign address */
1235
1236         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1237         if (baselen > len)
1238                 return;
1239
1240         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1241                                 &elems);
1242
1243         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1244
1245         if (ifmgd->associated &&
1246             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1247             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1248                             IEEE80211_STA_CONNECTION_POLL)) {
1249                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1250                                   IEEE80211_STA_BEACON_POLL);
1251                 mutex_lock(&sdata->local->iflist_mtx);
1252                 ieee80211_recalc_ps(sdata->local, -1);
1253                 mutex_unlock(&sdata->local->iflist_mtx);
1254                 /*
1255                  * We've received a probe response, but are not sure whether
1256                  * we have or will be receiving any beacons or data, so let's
1257                  * schedule the timers again, just in case.
1258                  */
1259                 mod_beacon_timer(sdata);
1260                 mod_timer(&ifmgd->conn_mon_timer,
1261                           round_jiffies_up(jiffies +
1262                                            IEEE80211_CONNECTION_IDLE_TIME));
1263         }
1264 }
1265
1266 /*
1267  * This is the canonical list of information elements we care about,
1268  * the filter code also gives us all changes to the Microsoft OUI
1269  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1270  *
1271  * We implement beacon filtering in software since that means we can
1272  * avoid processing the frame here and in cfg80211, and userspace
1273  * will not be able to tell whether the hardware supports it or not.
1274  *
1275  * XXX: This list needs to be dynamic -- userspace needs to be able to
1276  *      add items it requires. It also needs to be able to tell us to
1277  *      look out for other vendor IEs.
1278  */
1279 static const u64 care_about_ies =
1280         (1ULL << WLAN_EID_COUNTRY) |
1281         (1ULL << WLAN_EID_ERP_INFO) |
1282         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1283         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1284         (1ULL << WLAN_EID_HT_CAPABILITY) |
1285         (1ULL << WLAN_EID_HT_INFORMATION);
1286
1287 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1288                                      struct ieee80211_mgmt *mgmt,
1289                                      size_t len,
1290                                      struct ieee80211_rx_status *rx_status)
1291 {
1292         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1293         size_t baselen;
1294         struct ieee802_11_elems elems;
1295         struct ieee80211_local *local = sdata->local;
1296         u32 changed = 0;
1297         bool erp_valid, directed_tim = false;
1298         u8 erp_value = 0;
1299         u32 ncrc;
1300         u8 *bssid;
1301
1302         ASSERT_MGD_MTX(ifmgd);
1303
1304         /* Process beacon from the current BSS */
1305         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1306         if (baselen > len)
1307                 return;
1308
1309         if (rx_status->freq != local->hw.conf.channel->center_freq)
1310                 return;
1311
1312         /*
1313          * We might have received a number of frames, among them a
1314          * disassoc frame and a beacon...
1315          */
1316         if (!ifmgd->associated)
1317                 return;
1318
1319         bssid = ifmgd->associated->bssid;
1320
1321         /*
1322          * And in theory even frames from a different AP we were just
1323          * associated to a split-second ago!
1324          */
1325         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1326                 return;
1327
1328         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1329 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1330                 if (net_ratelimit()) {
1331                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1332                                "to a received beacon\n", sdata->name);
1333                 }
1334 #endif
1335                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1336                 mutex_lock(&local->iflist_mtx);
1337                 ieee80211_recalc_ps(local, -1);
1338                 mutex_unlock(&local->iflist_mtx);
1339         }
1340
1341         /*
1342          * Push the beacon loss detection into the future since
1343          * we are processing a beacon from the AP just now.
1344          */
1345         mod_beacon_timer(sdata);
1346
1347         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1348         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1349                                           len - baselen, &elems,
1350                                           care_about_ies, ncrc);
1351
1352         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1353                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1354                                                    ifmgd->aid);
1355
1356         if (ncrc != ifmgd->beacon_crc) {
1357                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1358                                       true);
1359
1360                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1361                                          elems.wmm_param_len);
1362         }
1363
1364         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1365                 if (directed_tim) {
1366                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1367                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1368                                 ieee80211_hw_config(local,
1369                                                     IEEE80211_CONF_CHANGE_PS);
1370                                 ieee80211_send_nullfunc(local, sdata, 0);
1371                         } else {
1372                                 local->pspolling = true;
1373
1374                                 /*
1375                                  * Here is assumed that the driver will be
1376                                  * able to send ps-poll frame and receive a
1377                                  * response even though power save mode is
1378                                  * enabled, but some drivers might require
1379                                  * to disable power save here. This needs
1380                                  * to be investigated.
1381                                  */
1382                                 ieee80211_send_pspoll(local, sdata);
1383                         }
1384                 }
1385         }
1386
1387         if (ncrc == ifmgd->beacon_crc)
1388                 return;
1389         ifmgd->beacon_crc = ncrc;
1390
1391         if (elems.erp_info && elems.erp_info_len >= 1) {
1392                 erp_valid = true;
1393                 erp_value = elems.erp_info[0];
1394         } else {
1395                 erp_valid = false;
1396         }
1397         changed |= ieee80211_handle_bss_capability(sdata,
1398                         le16_to_cpu(mgmt->u.beacon.capab_info),
1399                         erp_valid, erp_value);
1400
1401
1402         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1403             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1404                 struct sta_info *sta;
1405                 struct ieee80211_supported_band *sband;
1406                 u16 ap_ht_cap_flags;
1407
1408                 rcu_read_lock();
1409
1410                 sta = sta_info_get(sdata, bssid);
1411                 if (WARN_ON(!sta)) {
1412                         rcu_read_unlock();
1413                         return;
1414                 }
1415
1416                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1417
1418                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1419                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1420
1421                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1422
1423                 rcu_read_unlock();
1424
1425                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1426                                                bssid, ap_ht_cap_flags);
1427         }
1428
1429         /* Note: country IE parsing is done for us by cfg80211 */
1430         if (elems.country_elem) {
1431                 /* TODO: IBSS also needs this */
1432                 if (elems.pwr_constr_elem)
1433                         ieee80211_handle_pwr_constr(sdata,
1434                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1435                                 elems.pwr_constr_elem,
1436                                 elems.pwr_constr_elem_len);
1437         }
1438
1439         ieee80211_bss_info_change_notify(sdata, changed);
1440 }
1441
1442 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1443                                           struct sk_buff *skb)
1444 {
1445         struct ieee80211_local *local = sdata->local;
1446         struct ieee80211_mgmt *mgmt;
1447         u16 fc;
1448
1449         if (skb->len < 24)
1450                 return RX_DROP_MONITOR;
1451
1452         mgmt = (struct ieee80211_mgmt *) skb->data;
1453         fc = le16_to_cpu(mgmt->frame_control);
1454
1455         switch (fc & IEEE80211_FCTL_STYPE) {
1456         case IEEE80211_STYPE_PROBE_RESP:
1457         case IEEE80211_STYPE_BEACON:
1458         case IEEE80211_STYPE_DEAUTH:
1459         case IEEE80211_STYPE_DISASSOC:
1460         case IEEE80211_STYPE_ACTION:
1461                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1462                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1463                 return RX_QUEUED;
1464         }
1465
1466         return RX_DROP_MONITOR;
1467 }
1468
1469 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1470                                          struct sk_buff *skb)
1471 {
1472         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1473         struct ieee80211_rx_status *rx_status;
1474         struct ieee80211_mgmt *mgmt;
1475         enum rx_mgmt_action rma = RX_MGMT_NONE;
1476         u16 fc;
1477
1478         rx_status = (struct ieee80211_rx_status *) skb->cb;
1479         mgmt = (struct ieee80211_mgmt *) skb->data;
1480         fc = le16_to_cpu(mgmt->frame_control);
1481
1482         mutex_lock(&ifmgd->mtx);
1483
1484         if (ifmgd->associated &&
1485             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1486                 switch (fc & IEEE80211_FCTL_STYPE) {
1487                 case IEEE80211_STYPE_BEACON:
1488                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1489                                                  rx_status);
1490                         break;
1491                 case IEEE80211_STYPE_PROBE_RESP:
1492                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1493                         break;
1494                 case IEEE80211_STYPE_DEAUTH:
1495                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1496                         break;
1497                 case IEEE80211_STYPE_DISASSOC:
1498                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1499                         break;
1500                 case IEEE80211_STYPE_ACTION:
1501                         if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1502                                 break;
1503
1504                         ieee80211_sta_process_chanswitch(sdata,
1505                                         &mgmt->u.action.u.chan_switch.sw_elem,
1506                                         (void *)ifmgd->associated->priv);
1507                         break;
1508                 }
1509                 mutex_unlock(&ifmgd->mtx);
1510
1511                 switch (rma) {
1512                 case RX_MGMT_NONE:
1513                         /* no action */
1514                         break;
1515                 case RX_MGMT_CFG80211_DEAUTH:
1516                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1517                         break;
1518                 case RX_MGMT_CFG80211_DISASSOC:
1519                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1520                         break;
1521                 default:
1522                         WARN(1, "unexpected: %d", rma);
1523                 }
1524                 goto out;
1525         }
1526
1527         mutex_unlock(&ifmgd->mtx);
1528
1529         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1530             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1531                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1532
1533  out:
1534         kfree_skb(skb);
1535 }
1536
1537 static void ieee80211_sta_timer(unsigned long data)
1538 {
1539         struct ieee80211_sub_if_data *sdata =
1540                 (struct ieee80211_sub_if_data *) data;
1541         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1542         struct ieee80211_local *local = sdata->local;
1543
1544         if (local->quiescing) {
1545                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1546                 return;
1547         }
1548
1549         ieee80211_queue_work(&local->hw, &ifmgd->work);
1550 }
1551
1552 static void ieee80211_sta_work(struct work_struct *work)
1553 {
1554         struct ieee80211_sub_if_data *sdata =
1555                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1556         struct ieee80211_local *local = sdata->local;
1557         struct ieee80211_if_managed *ifmgd;
1558         struct sk_buff *skb;
1559
1560         if (!ieee80211_sdata_running(sdata))
1561                 return;
1562
1563         if (local->scanning)
1564                 return;
1565
1566         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1567                 return;
1568
1569         /*
1570          * ieee80211_queue_work() should have picked up most cases,
1571          * here we'll pick the the rest.
1572          */
1573         if (WARN(local->suspended, "STA MLME work scheduled while "
1574                  "going to suspend\n"))
1575                 return;
1576
1577         ifmgd = &sdata->u.mgd;
1578
1579         /* first process frames to avoid timing out while a frame is pending */
1580         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1581                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1582
1583         /* then process the rest of the work */
1584         mutex_lock(&ifmgd->mtx);
1585
1586         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1587                             IEEE80211_STA_CONNECTION_POLL) &&
1588             ifmgd->associated) {
1589                 u8 bssid[ETH_ALEN];
1590
1591                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1592                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1593                         run_again(ifmgd, ifmgd->probe_timeout);
1594
1595                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1596 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1597                         printk(KERN_DEBUG "No probe response from AP %pM"
1598                                 " after %dms, try %d\n", bssid,
1599                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1600                                 ifmgd->probe_send_count);
1601 #endif
1602                         ieee80211_mgd_probe_ap_send(sdata);
1603                 } else {
1604                         /*
1605                          * We actually lost the connection ... or did we?
1606                          * Let's make sure!
1607                          */
1608                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1609                                           IEEE80211_STA_BEACON_POLL);
1610                         printk(KERN_DEBUG "No probe response from AP %pM"
1611                                 " after %dms, disconnecting.\n",
1612                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1613                         ieee80211_set_disassoc(sdata);
1614                         ieee80211_recalc_idle(local);
1615                         mutex_unlock(&ifmgd->mtx);
1616                         /*
1617                          * must be outside lock due to cfg80211,
1618                          * but that's not a problem.
1619                          */
1620                         ieee80211_send_deauth_disassoc(sdata, bssid,
1621                                         IEEE80211_STYPE_DEAUTH,
1622                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1623                                         NULL);
1624                         mutex_lock(&ifmgd->mtx);
1625                 }
1626         }
1627
1628         mutex_unlock(&ifmgd->mtx);
1629 }
1630
1631 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1632 {
1633         struct ieee80211_sub_if_data *sdata =
1634                 (struct ieee80211_sub_if_data *) data;
1635         struct ieee80211_local *local = sdata->local;
1636
1637         if (local->quiescing)
1638                 return;
1639
1640         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1641 }
1642
1643 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1644 {
1645         struct ieee80211_sub_if_data *sdata =
1646                 (struct ieee80211_sub_if_data *) data;
1647         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1648         struct ieee80211_local *local = sdata->local;
1649
1650         if (local->quiescing)
1651                 return;
1652
1653         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1654 }
1655
1656 static void ieee80211_sta_monitor_work(struct work_struct *work)
1657 {
1658         struct ieee80211_sub_if_data *sdata =
1659                 container_of(work, struct ieee80211_sub_if_data,
1660                              u.mgd.monitor_work);
1661
1662         ieee80211_mgd_probe_ap(sdata, false);
1663 }
1664
1665 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1666 {
1667         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1668                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1669                                         IEEE80211_STA_CONNECTION_POLL);
1670
1671                 /* let's probe the connection once */
1672                 ieee80211_queue_work(&sdata->local->hw,
1673                            &sdata->u.mgd.monitor_work);
1674                 /* and do all the other regular work too */
1675                 ieee80211_queue_work(&sdata->local->hw,
1676                            &sdata->u.mgd.work);
1677         }
1678 }
1679
1680 #ifdef CONFIG_PM
1681 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1682 {
1683         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1684
1685         /*
1686          * we need to use atomic bitops for the running bits
1687          * only because both timers might fire at the same
1688          * time -- the code here is properly synchronised.
1689          */
1690
1691         cancel_work_sync(&ifmgd->work);
1692         cancel_work_sync(&ifmgd->beacon_loss_work);
1693         if (del_timer_sync(&ifmgd->timer))
1694                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1695
1696         cancel_work_sync(&ifmgd->chswitch_work);
1697         if (del_timer_sync(&ifmgd->chswitch_timer))
1698                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1699
1700         cancel_work_sync(&ifmgd->monitor_work);
1701         /* these will just be re-established on connection */
1702         del_timer_sync(&ifmgd->conn_mon_timer);
1703         del_timer_sync(&ifmgd->bcn_mon_timer);
1704 }
1705
1706 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1707 {
1708         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1709
1710         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1711                 add_timer(&ifmgd->timer);
1712         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1713                 add_timer(&ifmgd->chswitch_timer);
1714 }
1715 #endif
1716
1717 /* interface setup */
1718 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1719 {
1720         struct ieee80211_if_managed *ifmgd;
1721
1722         ifmgd = &sdata->u.mgd;
1723         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1724         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1725         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1726         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
1727         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1728                     (unsigned long) sdata);
1729         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1730                     (unsigned long) sdata);
1731         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1732                     (unsigned long) sdata);
1733         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1734                     (unsigned long) sdata);
1735         skb_queue_head_init(&ifmgd->skb_queue);
1736
1737         ifmgd->flags = 0;
1738
1739         mutex_init(&ifmgd->mtx);
1740
1741         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1742                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1743         else
1744                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1745 }
1746
1747 /* scan finished notification */
1748 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1749 {
1750         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1751
1752         /* Restart STA timers */
1753         rcu_read_lock();
1754         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1755                 ieee80211_restart_sta_timer(sdata);
1756         rcu_read_unlock();
1757 }
1758
1759 int ieee80211_max_network_latency(struct notifier_block *nb,
1760                                   unsigned long data, void *dummy)
1761 {
1762         s32 latency_usec = (s32) data;
1763         struct ieee80211_local *local =
1764                 container_of(nb, struct ieee80211_local,
1765                              network_latency_notifier);
1766
1767         mutex_lock(&local->iflist_mtx);
1768         ieee80211_recalc_ps(local, latency_usec);
1769         mutex_unlock(&local->iflist_mtx);
1770
1771         return 0;
1772 }
1773
1774 /* config hooks */
1775 static enum work_done_result
1776 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1777                           struct sk_buff *skb)
1778 {
1779         if (!skb) {
1780                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1781                 return WORK_DONE_DESTROY;
1782         }
1783
1784         if (wk->type == IEEE80211_WORK_AUTH) {
1785                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1786                 return WORK_DONE_DESTROY;
1787         }
1788
1789         mutex_lock(&wk->sdata->u.mgd.mtx);
1790         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1791         mutex_unlock(&wk->sdata->u.mgd.mtx);
1792
1793         wk->type = IEEE80211_WORK_AUTH;
1794         wk->probe_auth.tries = 0;
1795         return WORK_DONE_REQUEUE;
1796 }
1797
1798 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1799                        struct cfg80211_auth_request *req)
1800 {
1801         const u8 *ssid;
1802         struct ieee80211_work *wk;
1803         u16 auth_alg;
1804
1805         switch (req->auth_type) {
1806         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1807                 auth_alg = WLAN_AUTH_OPEN;
1808                 break;
1809         case NL80211_AUTHTYPE_SHARED_KEY:
1810                 auth_alg = WLAN_AUTH_SHARED_KEY;
1811                 break;
1812         case NL80211_AUTHTYPE_FT:
1813                 auth_alg = WLAN_AUTH_FT;
1814                 break;
1815         case NL80211_AUTHTYPE_NETWORK_EAP:
1816                 auth_alg = WLAN_AUTH_LEAP;
1817                 break;
1818         default:
1819                 return -EOPNOTSUPP;
1820         }
1821
1822         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1823         if (!wk)
1824                 return -ENOMEM;
1825
1826         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1827
1828         if (req->ie && req->ie_len) {
1829                 memcpy(wk->ie, req->ie, req->ie_len);
1830                 wk->ie_len = req->ie_len;
1831         }
1832
1833         if (req->key && req->key_len) {
1834                 wk->probe_auth.key_len = req->key_len;
1835                 wk->probe_auth.key_idx = req->key_idx;
1836                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1837         }
1838
1839         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1840         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1841         wk->probe_auth.ssid_len = ssid[1];
1842
1843         wk->probe_auth.algorithm = auth_alg;
1844         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1845
1846         /* if we already have a probe, don't probe again */
1847         if (req->bss->proberesp_ies)
1848                 wk->type = IEEE80211_WORK_AUTH;
1849         else
1850                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1851         wk->chan = req->bss->channel;
1852         wk->sdata = sdata;
1853         wk->done = ieee80211_probe_auth_done;
1854
1855         ieee80211_add_work(wk);
1856         return 0;
1857 }
1858
1859 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1860                                                   struct sk_buff *skb)
1861 {
1862         struct ieee80211_mgmt *mgmt;
1863         u16 status;
1864
1865         if (!skb) {
1866                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1867                 return WORK_DONE_DESTROY;
1868         }
1869
1870         mgmt = (void *)skb->data;
1871         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1872
1873         if (status == WLAN_STATUS_SUCCESS) {
1874                 mutex_lock(&wk->sdata->u.mgd.mtx);
1875                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1876                         mutex_unlock(&wk->sdata->u.mgd.mtx);
1877                         /* oops -- internal error -- send timeout for now */
1878                         cfg80211_send_assoc_timeout(wk->sdata->dev,
1879                                                     wk->filter_ta);
1880                         return WORK_DONE_DESTROY;
1881                 }
1882                 mutex_unlock(&wk->sdata->u.mgd.mtx);
1883         }
1884
1885         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1886         return WORK_DONE_DESTROY;
1887 }
1888
1889 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1890                         struct cfg80211_assoc_request *req)
1891 {
1892         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1893         struct ieee80211_bss *bss = (void *)req->bss->priv;
1894         struct ieee80211_work *wk;
1895         const u8 *ssid;
1896         int i;
1897
1898         mutex_lock(&ifmgd->mtx);
1899         if (ifmgd->associated) {
1900                 if (!req->prev_bssid ||
1901                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
1902                            ETH_ALEN)) {
1903                         /*
1904                          * We are already associated and the request was not a
1905                          * reassociation request from the current BSS, so
1906                          * reject it.
1907                          */
1908                         mutex_unlock(&ifmgd->mtx);
1909                         return -EALREADY;
1910                 }
1911
1912                 /* Trying to reassociate - clear previous association state */
1913                 ieee80211_set_disassoc(sdata);
1914         }
1915         mutex_unlock(&ifmgd->mtx);
1916
1917         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1918         if (!wk)
1919                 return -ENOMEM;
1920
1921         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
1922         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1923
1924         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
1925                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
1926                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
1927                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
1928                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
1929
1930
1931         if (req->ie && req->ie_len) {
1932                 memcpy(wk->ie, req->ie, req->ie_len);
1933                 wk->ie_len = req->ie_len;
1934         } else
1935                 wk->ie_len = 0;
1936
1937         wk->assoc.bss = req->bss;
1938
1939         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1940
1941         /* new association always uses requested smps mode */
1942         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
1943                 if (ifmgd->powersave)
1944                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
1945                 else
1946                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
1947         } else
1948                 ifmgd->ap_smps = ifmgd->req_smps;
1949
1950         wk->assoc.smps = ifmgd->ap_smps;
1951         /*
1952          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
1953          * We still associate in non-HT mode (11a/b/g) if any one of these
1954          * ciphers is configured as pairwise.
1955          * We can set this to true for non-11n hardware, that'll be checked
1956          * separately along with the peer capabilities.
1957          */
1958         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
1959         wk->assoc.capability = req->bss->capability;
1960         wk->assoc.wmm_used = bss->wmm_used;
1961         wk->assoc.supp_rates = bss->supp_rates;
1962         wk->assoc.supp_rates_len = bss->supp_rates_len;
1963         wk->assoc.ht_information_ie =
1964                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
1965
1966         if (bss->wmm_used && bss->uapsd_supported &&
1967             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
1968                 wk->assoc.uapsd_used = true;
1969                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
1970         } else {
1971                 wk->assoc.uapsd_used = false;
1972                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
1973         }
1974
1975         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1976         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
1977         wk->assoc.ssid_len = ssid[1];
1978
1979         if (req->prev_bssid)
1980                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
1981
1982         wk->type = IEEE80211_WORK_ASSOC;
1983         wk->chan = req->bss->channel;
1984         wk->sdata = sdata;
1985         wk->done = ieee80211_assoc_done;
1986
1987         if (req->use_mfp) {
1988                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
1989                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
1990         } else {
1991                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
1992                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
1993         }
1994
1995         if (req->crypto.control_port)
1996                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
1997         else
1998                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
1999
2000         ieee80211_add_work(wk);
2001         return 0;
2002 }
2003
2004 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2005                          struct cfg80211_deauth_request *req,
2006                          void *cookie)
2007 {
2008         struct ieee80211_local *local = sdata->local;
2009         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2010         struct ieee80211_work *wk;
2011         const u8 *bssid = req->bss->bssid;
2012
2013         mutex_lock(&ifmgd->mtx);
2014
2015         if (ifmgd->associated == req->bss) {
2016                 bssid = req->bss->bssid;
2017                 ieee80211_set_disassoc(sdata);
2018                 mutex_unlock(&ifmgd->mtx);
2019         } else {
2020                 bool not_auth_yet = false;
2021
2022                 mutex_unlock(&ifmgd->mtx);
2023
2024                 mutex_lock(&local->work_mtx);
2025                 list_for_each_entry(wk, &local->work_list, list) {
2026                         if (wk->sdata != sdata)
2027                                 continue;
2028
2029                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2030                             wk->type != IEEE80211_WORK_AUTH)
2031                                 continue;
2032
2033                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2034                                 continue;
2035
2036                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2037                         list_del_rcu(&wk->list);
2038                         free_work(wk);
2039                         break;
2040                 }
2041                 mutex_unlock(&local->work_mtx);
2042
2043                 /*
2044                  * If somebody requests authentication and we haven't
2045                  * sent out an auth frame yet there's no need to send
2046                  * out a deauth frame either. If the state was PROBE,
2047                  * then this is the case. If it's AUTH we have sent a
2048                  * frame, and if it's IDLE we have completed the auth
2049                  * process already.
2050                  */
2051                 if (not_auth_yet) {
2052                         __cfg80211_auth_canceled(sdata->dev, bssid);
2053                         return 0;
2054                 }
2055         }
2056
2057         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2058                sdata->name, bssid, req->reason_code);
2059
2060         ieee80211_send_deauth_disassoc(sdata, bssid,
2061                         IEEE80211_STYPE_DEAUTH, req->reason_code,
2062                         cookie);
2063
2064         ieee80211_recalc_idle(sdata->local);
2065
2066         return 0;
2067 }
2068
2069 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2070                            struct cfg80211_disassoc_request *req,
2071                            void *cookie)
2072 {
2073         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2074
2075         mutex_lock(&ifmgd->mtx);
2076
2077         /*
2078          * cfg80211 should catch this ... but it's racy since
2079          * we can receive a disassoc frame, process it, hand it
2080          * to cfg80211 while that's in a locked section already
2081          * trying to tell us that the user wants to disconnect.
2082          */
2083         if (ifmgd->associated != req->bss) {
2084                 mutex_unlock(&ifmgd->mtx);
2085                 return -ENOLINK;
2086         }
2087
2088         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2089                sdata->name, req->bss->bssid, req->reason_code);
2090
2091         ieee80211_set_disassoc(sdata);
2092
2093         mutex_unlock(&ifmgd->mtx);
2094
2095         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2096                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2097                         cookie);
2098
2099         ieee80211_recalc_idle(sdata->local);
2100
2101         return 0;
2102 }
2103
2104 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2105                          struct ieee80211_channel *chan,
2106                          enum nl80211_channel_type channel_type,
2107                          const u8 *buf, size_t len, u64 *cookie)
2108 {
2109         struct ieee80211_local *local = sdata->local;
2110         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2111         struct sk_buff *skb;
2112
2113         /* Check that we are on the requested channel for transmission */
2114         if ((chan != local->tmp_channel ||
2115              channel_type != local->tmp_channel_type) &&
2116             (chan != local->oper_channel ||
2117              channel_type != local->oper_channel_type))
2118                 return -EBUSY;
2119
2120         skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2121         if (!skb)
2122                 return -ENOMEM;
2123         skb_reserve(skb, local->hw.extra_tx_headroom);
2124
2125         memcpy(skb_put(skb, len), buf, len);
2126
2127         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2128                 IEEE80211_SKB_CB(skb)->flags |=
2129                         IEEE80211_TX_INTFL_DONT_ENCRYPT;
2130         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2131                 IEEE80211_TX_CTL_REQ_TX_STATUS;
2132         skb->dev = sdata->dev;
2133         ieee80211_tx_skb(sdata, skb);
2134
2135         *cookie = (unsigned long) skb;
2136         return 0;
2137 }