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 <linux/slab.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "driver-ops.h"
  28 #include "rate.h"
  29 #include "led.h"
  30
  31 #define IEEE80211_MAX_PROBE_TRIES 5
  32
  33 /*
  34  * beacon loss detection timeout
  35  * XXX: should depend on beacon interval
  36  */
  37 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
  38 /*
  39  * Time the connection can be idle before we probe
  40  * it to see if we can still talk to the AP.
  41  */
  42 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  43 /*
  44  * Time we wait for a probe response after sending
  45  * a probe request because of beacon loss or for
  46  * checking the connection still works.
  47  */
  48 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  49
  50 #define TMR_RUNNING_TIMER       0
  51 #define TMR_RUNNING_CHANSW      1
  52
  53 /*
  54  * All cfg80211 functions have to be called outside a locked
  55  * section so that they can acquire a lock themselves... This
  56  * is much simpler than queuing up things in cfg80211, but we
  57  * do need some indirection for that here.
  58  */
  59 enum rx_mgmt_action {
  60         /* no action required */
  61         RX_MGMT_NONE,
  62
  63         /* caller must call cfg80211_send_rx_auth() */
  64         RX_MGMT_CFG80211_AUTH,
  65
  66         /* caller must call cfg80211_send_rx_assoc() */
  67         RX_MGMT_CFG80211_ASSOC,
  68
  69         /* caller must call cfg80211_send_deauth() */
  70         RX_MGMT_CFG80211_DEAUTH,
  71
  72         /* caller must call cfg80211_send_disassoc() */
  73         RX_MGMT_CFG80211_DISASSOC,
  74
  75         /* caller must tell cfg80211 about internal error */
  76         RX_MGMT_CFG80211_ASSOC_ERROR,
  77 };
  78
  79 /* utils */
  80 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  81 {
  82         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  83 }
  84
  85 /*
  86  * We can have multiple work items (and connection probing)
  87  * scheduling this timer, but we need to take care to only
  88  * reschedule it when it should fire _earlier_ than it was
  89  * asked for before, or if it's not pending right now. This
  90  * function ensures that. Note that it then is required to
  91  * run this function for all timeouts after the first one
  92  * has happened -- the work that runs from this timer will
  93  * do that.
  94  */
  95 static void run_again(struct ieee80211_if_managed *ifmgd,
  96                              unsigned long timeout)
  97 {
  98         ASSERT_MGD_MTX(ifmgd);
  99
 100         if (!timer_pending(&ifmgd->timer) ||
 101             time_before(timeout, ifmgd->timer.expires))
 102                 mod_timer(&ifmgd->timer, timeout);
 103 }
 104
 105 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 106 {
 107         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 108                 return;
 109
 110         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 111                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 112 }
 113
 114 static int ecw2cw(int ecw)
 115 {
 116         return (1 << ecw) - 1;
 117 }
 118
 119 /*
 120  * ieee80211_enable_ht should be called only after the operating band
 121  * has been determined as ht configuration depends on the hw's
 122  * HT abilities for a specific band.
 123  */
 124 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 125                                struct ieee80211_ht_info *hti,
 126                                const u8 *bssid, u16 ap_ht_cap_flags)
 127 {
 128         struct ieee80211_local *local = sdata->local;
 129         struct ieee80211_supported_band *sband;
 130         struct sta_info *sta;
 131         u32 changed = 0;
 132         u16 ht_opmode;
 133         bool enable_ht = true, ht_changed;
 134         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 135
 136         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 137
 138         /* HT is not supported */
 139         if (!sband->ht_cap.ht_supported)
 140                 enable_ht = false;
 141
 142         /* check that channel matches the right operating channel */
 143         if (local->hw.conf.channel->center_freq !=
 144             ieee80211_channel_to_frequency(hti->control_chan))
 145                 enable_ht = false;
 146
 147         if (enable_ht) {
 148                 channel_type = NL80211_CHAN_HT20;
 149
 150                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 151                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 152                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 153                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 154                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 155                                 if (!(local->hw.conf.channel->flags &
 156                                     IEEE80211_CHAN_NO_HT40PLUS))
 157                                         channel_type = NL80211_CHAN_HT40PLUS;
 158                                 break;
 159                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 160                                 if (!(local->hw.conf.channel->flags &
 161                                     IEEE80211_CHAN_NO_HT40MINUS))
 162                                         channel_type = NL80211_CHAN_HT40MINUS;
 163                                 break;
 164                         }
 165                 }
 166         }
 167
 168         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 169                      channel_type != local->hw.conf.channel_type;
 170
 171         if (local->tmp_channel)
 172                 local->tmp_channel_type = channel_type;
 173         local->oper_channel_type = channel_type;
 174
 175         if (ht_changed) {
 176                 /* channel_type change automatically detected */
 177                 ieee80211_hw_config(local, 0);
 178
 179                 rcu_read_lock();
 180                 sta = sta_info_get(sdata, bssid);
 181                 if (sta)
 182                         rate_control_rate_update(local, sband, sta,
 183                                                  IEEE80211_RC_HT_CHANGED,
 184                                                  local->oper_channel_type);
 185                 rcu_read_unlock();
 186         }
 187
 188         /* disable HT */
 189         if (!enable_ht)
 190                 return 0;
 191
 192         ht_opmode = le16_to_cpu(hti->operation_mode);
 193
 194         /* if bss configuration changed store the new one */
 195         if (!sdata->ht_opmode_valid ||
 196             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 197                 changed |= BSS_CHANGED_HT;
 198                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 199                 sdata->ht_opmode_valid = true;
 200         }
 201
 202         return changed;
 203 }
 204
 205 /* frame sending functions */
 206
 207 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 208                                            const u8 *bssid, u16 stype, u16 reason,
 209                                            void *cookie)
 210 {
 211         struct ieee80211_local *local = sdata->local;
 212         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 213         struct sk_buff *skb;
 214         struct ieee80211_mgmt *mgmt;
 215
 216         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 217         if (!skb) {
 218                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 219                        "deauth/disassoc frame\n", sdata->name);
 220                 return;
 221         }
 222         skb_reserve(skb, local->hw.extra_tx_headroom);
 223
 224         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 225         memset(mgmt, 0, 24);
 226         memcpy(mgmt->da, bssid, ETH_ALEN);
 227         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 228         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 229         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 230         skb_put(skb, 2);
 231         /* u.deauth.reason_code == u.disassoc.reason_code */
 232         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 233
 234         if (stype == IEEE80211_STYPE_DEAUTH)
 235                 if (cookie)
 236                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 237                 else
 238                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 239         else
 240                 if (cookie)
 241                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 242                 else
 243                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 244         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 245                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 246         ieee80211_tx_skb(sdata, skb);
 247 }
 248
 249 void ieee80211_send_pspoll(struct ieee80211_local *local,
 250                            struct ieee80211_sub_if_data *sdata)
 251 {
 252         struct ieee80211_pspoll *pspoll;
 253         struct sk_buff *skb;
 254
 255         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 256         if (!skb)
 257                 return;
 258
 259         pspoll = (struct ieee80211_pspoll *) skb->data;
 260         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 261
 262         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 263         ieee80211_tx_skb(sdata, skb);
 264 }
 265
 266 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 267                              struct ieee80211_sub_if_data *sdata,
 268                              int powersave)
 269 {
 270         struct sk_buff *skb;
 271         struct ieee80211_hdr_3addr *nullfunc;
 272
 273         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 274         if (!skb)
 275                 return;
 276
 277         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 278         if (powersave)
 279                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 280
 281         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 282         ieee80211_tx_skb(sdata, skb);
 283 }
 284
 285 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 286                                           struct ieee80211_sub_if_data *sdata)
 287 {
 288         struct sk_buff *skb;
 289         struct ieee80211_hdr *nullfunc;
 290         __le16 fc;
 291
 292         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 293                 return;
 294
 295         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 296         if (!skb) {
 297                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 298                        "nullfunc frame\n", sdata->name);
 299                 return;
 300         }
 301         skb_reserve(skb, local->hw.extra_tx_headroom);
 302
 303         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 304         memset(nullfunc, 0, 30);
 305         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 306                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 307         nullfunc->frame_control = fc;
 308         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 309         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 310         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 311         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 312
 313         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 314         ieee80211_tx_skb(sdata, skb);
 315 }
 316
 317 /* spectrum management related things */
 318 static void ieee80211_chswitch_work(struct work_struct *work)
 319 {
 320         struct ieee80211_sub_if_data *sdata =
 321                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 322         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 323
 324         if (!ieee80211_sdata_running(sdata))
 325                 return;
 326
 327         mutex_lock(&ifmgd->mtx);
 328         if (!ifmgd->associated)
 329                 goto out;
 330
 331         sdata->local->oper_channel = sdata->local->csa_channel;
 332         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
 333
 334         /* XXX: shouldn't really modify cfg80211-owned data! */
 335         ifmgd->associated->channel = sdata->local->oper_channel;
 336
 337         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 338                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 339  out:
 340         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 341         mutex_unlock(&ifmgd->mtx);
 342 }
 343
 344 static void ieee80211_chswitch_timer(unsigned long data)
 345 {
 346         struct ieee80211_sub_if_data *sdata =
 347                 (struct ieee80211_sub_if_data *) data;
 348         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 349
 350         if (sdata->local->quiescing) {
 351                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 352                 return;
 353         }
 354
 355         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 356 }
 357
 358 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 359                                       struct ieee80211_channel_sw_ie *sw_elem,
 360                                       struct ieee80211_bss *bss)
 361 {
 362         struct cfg80211_bss *cbss =
 363                 container_of((void *)bss, struct cfg80211_bss, priv);
 364         struct ieee80211_channel *new_ch;
 365         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 366         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 367
 368         ASSERT_MGD_MTX(ifmgd);
 369
 370         if (!ifmgd->associated)
 371                 return;
 372
 373         if (sdata->local->scanning)
 374                 return;
 375
 376         /* Disregard subsequent beacons if we are already running a timer
 377            processing a CSA */
 378
 379         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 380                 return;
 381
 382         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 383         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 384                 return;
 385
 386         sdata->local->csa_channel = new_ch;
 387
 388         if (sw_elem->count <= 1) {
 389                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 390         } else {
 391                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 392                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 393                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 394                 mod_timer(&ifmgd->chswitch_timer,
 395                           jiffies +
 396                           msecs_to_jiffies(sw_elem->count *
 397                                            cbss->beacon_interval));
 398         }
 399 }
 400
 401 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 402                                         u16 capab_info, u8 *pwr_constr_elem,
 403                                         u8 pwr_constr_elem_len)
 404 {
 405         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 406
 407         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 408                 return;
 409
 410         /* Power constraint IE length should be 1 octet */
 411         if (pwr_constr_elem_len != 1)
 412                 return;
 413
 414         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 415             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 416                 sdata->local->power_constr_level = *pwr_constr_elem;
 417                 ieee80211_hw_config(sdata->local, 0);
 418         }
 419 }
 420
 421 /* powersave */
 422 static void ieee80211_enable_ps(struct ieee80211_local *local,
 423                                 struct ieee80211_sub_if_data *sdata)
 424 {
 425         struct ieee80211_conf *conf = &local->hw.conf;
 426
 427         /*
 428          * If we are scanning right now then the parameters will
 429          * take effect when scan finishes.
 430          */
 431         if (local->scanning)
 432                 return;
 433
 434         if (conf->dynamic_ps_timeout > 0 &&
 435             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 436                 mod_timer(&local->dynamic_ps_timer, jiffies +
 437                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 438         } else {
 439                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 440                         ieee80211_send_nullfunc(local, sdata, 1);
 441
 442                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 443                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 444                         return;
 445
 446                 conf->flags |= IEEE80211_CONF_PS;
 447                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 448         }
 449 }
 450
 451 static void ieee80211_change_ps(struct ieee80211_local *local)
 452 {
 453         struct ieee80211_conf *conf = &local->hw.conf;
 454
 455         if (local->ps_sdata) {
 456                 ieee80211_enable_ps(local, local->ps_sdata);
 457         } else if (conf->flags & IEEE80211_CONF_PS) {
 458                 conf->flags &= ~IEEE80211_CONF_PS;
 459                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 460                 del_timer_sync(&local->dynamic_ps_timer);
 461                 cancel_work_sync(&local->dynamic_ps_enable_work);
 462         }
 463 }
 464
 465 /* need to hold RTNL or interface lock */
 466 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 467 {
 468         struct ieee80211_sub_if_data *sdata, *found = NULL;
 469         int count = 0;
 470
 471         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 472                 local->ps_sdata = NULL;
 473                 return;
 474         }
 475
 476         if (!list_empty(&local->work_list)) {
 477                 local->ps_sdata = NULL;
 478                 goto change;
 479         }
 480
 481         list_for_each_entry(sdata, &local->interfaces, list) {
 482                 if (!ieee80211_sdata_running(sdata))
 483                         continue;
 484                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 485                         continue;
 486                 found = sdata;
 487                 count++;
 488         }
 489
 490         if (count == 1 && found->u.mgd.powersave &&
 491             found->u.mgd.associated &&
 492             found->u.mgd.associated->beacon_ies &&
 493             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 494                                     IEEE80211_STA_CONNECTION_POLL))) {
 495                 s32 beaconint_us;
 496
 497                 if (latency < 0)
 498                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 499
 500                 beaconint_us = ieee80211_tu_to_usec(
 501                                         found->vif.bss_conf.beacon_int);
 502
 503                 if (beaconint_us > latency) {
 504                         local->ps_sdata = NULL;
 505                 } else {
 506                         struct ieee80211_bss *bss;
 507                         int maxslp = 1;
 508                         u8 dtimper;
 509
 510                         bss = (void *)found->u.mgd.associated->priv;
 511                         dtimper = bss->dtim_period;
 512
 513                         /* If the TIM IE is invalid, pretend the value is 1 */
 514                         if (!dtimper)
 515                                 dtimper = 1;
 516                         else if (dtimper > 1)
 517                                 maxslp = min_t(int, dtimper,
 518                                                     latency / beaconint_us);
 519
 520                         local->hw.conf.max_sleep_period = maxslp;
 521                         local->hw.conf.ps_dtim_period = dtimper;
 522                         local->ps_sdata = found;
 523                 }
 524         } else {
 525                 local->ps_sdata = NULL;
 526         }
 527
 528  change:
 529         ieee80211_change_ps(local);
 530 }
 531
 532 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 533 {
 534         struct ieee80211_local *local =
 535                 container_of(work, struct ieee80211_local,
 536                              dynamic_ps_disable_work);
 537
 538         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 539                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 540                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 541         }
 542
 543         ieee80211_wake_queues_by_reason(&local->hw,
 544                                         IEEE80211_QUEUE_STOP_REASON_PS);
 545 }
 546
 547 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 548 {
 549         struct ieee80211_local *local =
 550                 container_of(work, struct ieee80211_local,
 551                              dynamic_ps_enable_work);
 552         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 553         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 554
 555         /* can only happen when PS was just disabled anyway */
 556         if (!sdata)
 557                 return;
 558
 559         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 560                 return;
 561
 562         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 563             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 564                 ieee80211_send_nullfunc(local, sdata, 1);
 565
 566         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 567               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 568             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 569                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 570                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 571                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 572         }
 573 }
 574
 575 void ieee80211_dynamic_ps_timer(unsigned long data)
 576 {
 577         struct ieee80211_local *local = (void *) data;
 578
 579         if (local->quiescing || local->suspended)
 580                 return;
 581
 582         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 583 }
 584
 585 /* MLME */
 586 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 587                                      struct ieee80211_if_managed *ifmgd,
 588                                      u8 *wmm_param, size_t wmm_param_len)
 589 {
 590         struct ieee80211_tx_queue_params params;
 591         size_t left;
 592         int count;
 593         u8 *pos, uapsd_queues = 0;
 594
 595         if (local->hw.queues < 4)
 596                 return;
 597
 598         if (!wmm_param)
 599                 return;
 600
 601         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 602                 return;
 603
 604         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 605                 uapsd_queues = local->uapsd_queues;
 606
 607         count = wmm_param[6] & 0x0f;
 608         if (count == ifmgd->wmm_last_param_set)
 609                 return;
 610         ifmgd->wmm_last_param_set = count;
 611
 612         pos = wmm_param + 8;
 613         left = wmm_param_len - 8;
 614
 615         memset(&params, 0, sizeof(params));
 616
 617         local->wmm_acm = 0;
 618         for (; left >= 4; left -= 4, pos += 4) {
 619                 int aci = (pos[0] >> 5) & 0x03;
 620                 int acm = (pos[0] >> 4) & 0x01;
 621                 bool uapsd = false;
 622                 int queue;
 623
 624                 switch (aci) {
 625                 case 1: /* AC_BK */
 626                         queue = 3;
 627                         if (acm)
 628                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 629                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 630                                 uapsd = true;
 631                         break;
 632                 case 2: /* AC_VI */
 633                         queue = 1;
 634                         if (acm)
 635                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 636                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 637                                 uapsd = true;
 638                         break;
 639                 case 3: /* AC_VO */
 640                         queue = 0;
 641                         if (acm)
 642                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 643                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 644                                 uapsd = true;
 645                         break;
 646                 case 0: /* AC_BE */
 647                 default:
 648                         queue = 2;
 649                         if (acm)
 650                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 651                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 652                                 uapsd = true;
 653                         break;
 654                 }
 655
 656                 params.aifs = pos[0] & 0x0f;
 657                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 658                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 659                 params.txop = get_unaligned_le16(pos + 2);
 660                 params.uapsd = uapsd;
 661
 662 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 663                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 664                        "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 665                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 666                        params.aifs, params.cw_min, params.cw_max, params.txop,
 667                        params.uapsd);
 668 #endif
 669                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
 670                         printk(KERN_DEBUG "%s: failed to set TX queue "
 671                                "parameters for queue %d\n",
 672                                wiphy_name(local->hw.wiphy), queue);
 673         }
 674 }
 675
 676 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 677                                            u16 capab, bool erp_valid, u8 erp)
 678 {
 679         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 680         u32 changed = 0;
 681         bool use_protection;
 682         bool use_short_preamble;
 683         bool use_short_slot;
 684
 685         if (erp_valid) {
 686                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 687                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 688         } else {
 689                 use_protection = false;
 690                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 691         }
 692
 693         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 694         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 695                 use_short_slot = true;
 696
 697         if (use_protection != bss_conf->use_cts_prot) {
 698                 bss_conf->use_cts_prot = use_protection;
 699                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 700         }
 701
 702         if (use_short_preamble != bss_conf->use_short_preamble) {
 703                 bss_conf->use_short_preamble = use_short_preamble;
 704                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 705         }
 706
 707         if (use_short_slot != bss_conf->use_short_slot) {
 708                 bss_conf->use_short_slot = use_short_slot;
 709                 changed |= BSS_CHANGED_ERP_SLOT;
 710         }
 711
 712         return changed;
 713 }
 714
 715 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 716                                      struct cfg80211_bss *cbss,
 717                                      u32 bss_info_changed)
 718 {
 719         struct ieee80211_bss *bss = (void *)cbss->priv;
 720         struct ieee80211_local *local = sdata->local;
 721
 722         bss_info_changed |= BSS_CHANGED_ASSOC;
 723         /* set timing information */
 724         sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
 725         sdata->vif.bss_conf.timestamp = cbss->tsf;
 726
 727         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 728         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 729                 cbss->capability, bss->has_erp_value, bss->erp_value);
 730
 731         sdata->u.mgd.associated = cbss;
 732         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 733
 734         /* just to be sure */
 735         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 736                                 IEEE80211_STA_BEACON_POLL);
 737
 738         /*
 739          * Always handle WMM once after association regardless
 740          * of the first value the AP uses. Setting -1 here has
 741          * that effect because the AP values is an unsigned
 742          * 4-bit value.
 743          */
 744         sdata->u.mgd.wmm_last_param_set = -1;
 745
 746         ieee80211_led_assoc(local, 1);
 747
 748         sdata->vif.bss_conf.assoc = 1;
 749         /*
 750          * For now just always ask the driver to update the basic rateset
 751          * when we have associated, we aren't checking whether it actually
 752          * changed or not.
 753          */
 754         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 755
 756         /* And the BSSID changed - we're associated now */
 757         bss_info_changed |= BSS_CHANGED_BSSID;
 758
 759         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 760
 761         mutex_lock(&local->iflist_mtx);
 762         ieee80211_recalc_ps(local, -1);
 763         ieee80211_recalc_smps(local, sdata);
 764         mutex_unlock(&local->iflist_mtx);
 765
 766         netif_tx_start_all_queues(sdata->dev);
 767         netif_carrier_on(sdata->dev);
 768 }
 769
 770 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
 771 {
 772         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 773         struct ieee80211_local *local = sdata->local;
 774         struct sta_info *sta;
 775         u32 changed = 0, config_changed = 0;
 776         u8 bssid[ETH_ALEN];
 777
 778         ASSERT_MGD_MTX(ifmgd);
 779
 780         if (WARN_ON(!ifmgd->associated))
 781                 return;
 782
 783         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 784
 785         ifmgd->associated = NULL;
 786         memset(ifmgd->bssid, 0, ETH_ALEN);
 787
 788         /*
 789          * we need to commit the associated = NULL change because the
 790          * scan code uses that to determine whether this iface should
 791          * go to/wake up from powersave or not -- and could otherwise
 792          * wake the queues erroneously.
 793          */
 794         smp_mb();
 795
 796         /*
 797          * Thus, we can only afterwards stop the queues -- to account
 798          * for the case where another CPU is finishing a scan at this
 799          * time -- we don't want the scan code to enable queues.
 800          */
 801
 802         netif_tx_stop_all_queues(sdata->dev);
 803         netif_carrier_off(sdata->dev);
 804
 805         rcu_read_lock();
 806         sta = sta_info_get(sdata, bssid);
 807         if (sta) {
 808                 set_sta_flags(sta, WLAN_STA_DISASSOC);
 809                 ieee80211_sta_tear_down_BA_sessions(sta);
 810         }
 811         rcu_read_unlock();
 812
 813         changed |= ieee80211_reset_erp_info(sdata);
 814
 815         ieee80211_led_assoc(local, 0);
 816         changed |= BSS_CHANGED_ASSOC;
 817         sdata->vif.bss_conf.assoc = false;
 818
 819         ieee80211_set_wmm_default(sdata);
 820
 821         /* channel(_type) changes are handled by ieee80211_hw_config */
 822         local->oper_channel_type = NL80211_CHAN_NO_HT;
 823
 824         /* on the next assoc, re-program HT parameters */
 825         sdata->ht_opmode_valid = false;
 826
 827         local->power_constr_level = 0;
 828
 829         del_timer_sync(&local->dynamic_ps_timer);
 830         cancel_work_sync(&local->dynamic_ps_enable_work);
 831
 832         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 833                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 834                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 835         }
 836
 837         ieee80211_hw_config(local, config_changed);
 838
 839         /* And the BSSID changed -- not very interesting here */
 840         changed |= BSS_CHANGED_BSSID;
 841         ieee80211_bss_info_change_notify(sdata, changed);
 842
 843         sta_info_destroy_addr(sdata, bssid);
 844 }
 845
 846 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 847                              struct ieee80211_hdr *hdr)
 848 {
 849         /*
 850          * We can postpone the mgd.timer whenever receiving unicast frames
 851          * from AP because we know that the connection is working both ways
 852          * at that time. But multicast frames (and hence also beacons) must
 853          * be ignored here, because we need to trigger the timer during
 854          * data idle periods for sending the periodic probe request to the
 855          * AP we're connected to.
 856          */
 857         if (is_multicast_ether_addr(hdr->addr1))
 858                 return;
 859
 860         mod_timer(&sdata->u.mgd.conn_mon_timer,
 861                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 862 }
 863
 864 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
 865 {
 866         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 867         const u8 *ssid;
 868
 869         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
 870         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
 871                                  ssid + 2, ssid[1], NULL, 0);
 872
 873         ifmgd->probe_send_count++;
 874         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
 875         run_again(ifmgd, ifmgd->probe_timeout);
 876 }
 877
 878 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
 879                                    bool beacon)
 880 {
 881         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 882         bool already = false;
 883
 884         if (!ieee80211_sdata_running(sdata))
 885                 return;
 886
 887         if (sdata->local->scanning)
 888                 return;
 889
 890         if (sdata->local->tmp_channel)
 891                 return;
 892
 893         mutex_lock(&ifmgd->mtx);
 894
 895         if (!ifmgd->associated)
 896                 goto out;
 897
 898 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 899         if (beacon && net_ratelimit())
 900                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
 901                        "- sending probe request\n", sdata->name);
 902 #endif
 903
 904         /*
 905          * The driver/our work has already reported this event or the
 906          * connection monitoring has kicked in and we have already sent
 907          * a probe request. Or maybe the AP died and the driver keeps
 908          * reporting until we disassociate...
 909          *
 910          * In either case we have to ignore the current call to this
 911          * function (except for setting the correct probe reason bit)
 912          * because otherwise we would reset the timer every time and
 913          * never check whether we received a probe response!
 914          */
 915         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 916                             IEEE80211_STA_CONNECTION_POLL))
 917                 already = true;
 918
 919         if (beacon)
 920                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
 921         else
 922                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
 923
 924         if (already)
 925                 goto out;
 926
 927         mutex_lock(&sdata->local->iflist_mtx);
 928         ieee80211_recalc_ps(sdata->local, -1);
 929         mutex_unlock(&sdata->local->iflist_mtx);
 930
 931         ifmgd->probe_send_count = 0;
 932         ieee80211_mgd_probe_ap_send(sdata);
 933  out:
 934         mutex_unlock(&ifmgd->mtx);
 935 }
 936
 937 void ieee80211_beacon_loss_work(struct work_struct *work)
 938 {
 939         struct ieee80211_sub_if_data *sdata =
 940                 container_of(work, struct ieee80211_sub_if_data,
 941                              u.mgd.beacon_loss_work);
 942
 943         ieee80211_mgd_probe_ap(sdata, true);
 944 }
 945
 946 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
 947 {
 948         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 949
 950         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
 951 }
 952 EXPORT_SYMBOL(ieee80211_beacon_loss);
 953
 954 static enum rx_mgmt_action __must_check
 955 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
 956                          struct ieee80211_mgmt *mgmt, size_t len)
 957 {
 958         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 959         const u8 *bssid = NULL;
 960         u16 reason_code;
 961
 962         if (len < 24 + 2)
 963                 return RX_MGMT_NONE;
 964
 965         ASSERT_MGD_MTX(ifmgd);
 966
 967         bssid = ifmgd->associated->bssid;
 968
 969         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
 970
 971         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
 972                         sdata->name, bssid, reason_code);
 973
 974         ieee80211_set_disassoc(sdata);
 975         ieee80211_recalc_idle(sdata->local);
 976
 977         return RX_MGMT_CFG80211_DEAUTH;
 978 }
 979
 980
 981 static enum rx_mgmt_action __must_check
 982 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
 983                            struct ieee80211_mgmt *mgmt, size_t len)
 984 {
 985         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 986         u16 reason_code;
 987
 988         if (len < 24 + 2)
 989                 return RX_MGMT_NONE;
 990
 991         ASSERT_MGD_MTX(ifmgd);
 992
 993         if (WARN_ON(!ifmgd->associated))
 994                 return RX_MGMT_NONE;
 995
 996         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
 997                 return RX_MGMT_NONE;
 998
 999         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1000
1001         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1002                         sdata->name, mgmt->sa, reason_code);
1003
1004         ieee80211_set_disassoc(sdata);
1005         ieee80211_recalc_idle(sdata->local);
1006         return RX_MGMT_CFG80211_DISASSOC;
1007 }
1008
1009
1010 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1011                                     struct ieee80211_mgmt *mgmt, size_t len)
1012 {
1013         struct ieee80211_sub_if_data *sdata = wk->sdata;
1014         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1015         struct ieee80211_local *local = sdata->local;
1016         struct ieee80211_supported_band *sband;
1017         struct sta_info *sta;
1018         struct cfg80211_bss *cbss = wk->assoc.bss;
1019         u8 *pos;
1020         u32 rates, basic_rates;
1021         u16 capab_info, aid;
1022         struct ieee802_11_elems elems;
1023         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1024         u32 changed = 0;
1025         int i, j, err;
1026         bool have_higher_than_11mbit = false;
1027         u16 ap_ht_cap_flags;
1028
1029         /* AssocResp and ReassocResp have identical structure */
1030
1031         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1032         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1033
1034         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1035                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1036                        "set\n", sdata->name, aid);
1037         aid &= ~(BIT(15) | BIT(14));
1038
1039         pos = mgmt->u.assoc_resp.variable;
1040         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1041
1042         if (!elems.supp_rates) {
1043                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1044                        sdata->name);
1045                 return false;
1046         }
1047
1048         ifmgd->aid = aid;
1049
1050         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1051         if (!sta) {
1052                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1053                        " the AP\n", sdata->name);
1054                 return false;
1055         }
1056
1057         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1058                            WLAN_STA_ASSOC_AP);
1059         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1060                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1061
1062         rates = 0;
1063         basic_rates = 0;
1064         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1065
1066         for (i = 0; i < elems.supp_rates_len; i++) {
1067                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1068                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1069
1070                 if (rate > 110)
1071                         have_higher_than_11mbit = true;
1072
1073                 for (j = 0; j < sband->n_bitrates; j++) {
1074                         if (sband->bitrates[j].bitrate == rate) {
1075                                 rates |= BIT(j);
1076                                 if (is_basic)
1077                                         basic_rates |= BIT(j);
1078                                 break;
1079                         }
1080                 }
1081         }
1082
1083         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1084                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1085                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1086
1087                 if (rate > 110)
1088                         have_higher_than_11mbit = true;
1089
1090                 for (j = 0; j < sband->n_bitrates; j++) {
1091                         if (sband->bitrates[j].bitrate == rate) {
1092                                 rates |= BIT(j);
1093                                 if (is_basic)
1094                                         basic_rates |= BIT(j);
1095                                 break;
1096                         }
1097                 }
1098         }
1099
1100         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1101         sdata->vif.bss_conf.basic_rates = basic_rates;
1102
1103         /* cf. IEEE 802.11 9.2.12 */
1104         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1105             have_higher_than_11mbit)
1106                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1107         else
1108                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1109
1110         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1111                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1112                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1113
1114         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1115
1116         rate_control_rate_init(sta);
1117
1118         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1119                 set_sta_flags(sta, WLAN_STA_MFP);
1120
1121         if (elems.wmm_param)
1122                 set_sta_flags(sta, WLAN_STA_WME);
1123
1124         err = sta_info_insert(sta);
1125         sta = NULL;
1126         if (err) {
1127                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1128                        " the AP (error %d)\n", sdata->name, err);
1129                 return false;
1130         }
1131
1132         if (elems.wmm_param)
1133                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1134                                          elems.wmm_param_len);
1135         else
1136                 ieee80211_set_wmm_default(sdata);
1137
1138         local->oper_channel = wk->chan;
1139
1140         if (elems.ht_info_elem && elems.wmm_param &&
1141             (sdata->local->hw.queues >= 4) &&
1142             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1143                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1144                                                cbss->bssid, ap_ht_cap_flags);
1145
1146         /* set AID and assoc capability,
1147          * ieee80211_set_associated() will tell the driver */
1148         bss_conf->aid = aid;
1149         bss_conf->assoc_capability = capab_info;
1150         ieee80211_set_associated(sdata, cbss, changed);
1151
1152         /*
1153          * If we're using 4-addr mode, let the AP know that we're
1154          * doing so, so that it can create the STA VLAN on its side
1155          */
1156         if (ifmgd->use_4addr)
1157                 ieee80211_send_4addr_nullfunc(local, sdata);
1158
1159         /*
1160          * Start timer to probe the connection to the AP now.
1161          * Also start the timer that will detect beacon loss.
1162          */
1163         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1164         mod_beacon_timer(sdata);
1165
1166         return true;
1167 }
1168
1169
1170 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1171                                   struct ieee80211_mgmt *mgmt,
1172                                   size_t len,
1173                                   struct ieee80211_rx_status *rx_status,
1174                                   struct ieee802_11_elems *elems,
1175                                   bool beacon)
1176 {
1177         struct ieee80211_local *local = sdata->local;
1178         int freq;
1179         struct ieee80211_bss *bss;
1180         struct ieee80211_channel *channel;
1181         bool need_ps = false;
1182
1183         if (sdata->u.mgd.associated) {
1184                 bss = (void *)sdata->u.mgd.associated->priv;
1185                 /* not previously set so we may need to recalc */
1186                 need_ps = !bss->dtim_period;
1187         }
1188
1189         if (elems->ds_params && elems->ds_params_len == 1)
1190                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1191         else
1192                 freq = rx_status->freq;
1193
1194         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1195
1196         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1197                 return;
1198
1199         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1200                                         channel, beacon);
1201         if (bss)
1202                 ieee80211_rx_bss_put(local, bss);
1203
1204         if (!sdata->u.mgd.associated)
1205                 return;
1206
1207         if (need_ps) {
1208                 mutex_lock(&local->iflist_mtx);
1209                 ieee80211_recalc_ps(local, -1);
1210                 mutex_unlock(&local->iflist_mtx);
1211         }
1212
1213         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1214             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1215                                                         ETH_ALEN) == 0)) {
1216                 struct ieee80211_channel_sw_ie *sw_elem =
1217                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1218                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1219         }
1220 }
1221
1222
1223 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1224                                          struct sk_buff *skb)
1225 {
1226         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1227         struct ieee80211_if_managed *ifmgd;
1228         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1229         size_t baselen, len = skb->len;
1230         struct ieee802_11_elems elems;
1231
1232         ifmgd = &sdata->u.mgd;
1233
1234         ASSERT_MGD_MTX(ifmgd);
1235
1236         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1237                 return; /* ignore ProbeResp to foreign address */
1238
1239         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1240         if (baselen > len)
1241                 return;
1242
1243         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1244                                 &elems);
1245
1246         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1247
1248         if (ifmgd->associated &&
1249             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1250             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1251                             IEEE80211_STA_CONNECTION_POLL)) {
1252                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1253                                   IEEE80211_STA_BEACON_POLL);
1254                 mutex_lock(&sdata->local->iflist_mtx);
1255                 ieee80211_recalc_ps(sdata->local, -1);
1256                 mutex_unlock(&sdata->local->iflist_mtx);
1257                 /*
1258                  * We've received a probe response, but are not sure whether
1259                  * we have or will be receiving any beacons or data, so let's
1260                  * schedule the timers again, just in case.
1261                  */
1262                 mod_beacon_timer(sdata);
1263                 mod_timer(&ifmgd->conn_mon_timer,
1264                           round_jiffies_up(jiffies +
1265                                            IEEE80211_CONNECTION_IDLE_TIME));
1266         }
1267 }
1268
1269 /*
1270  * This is the canonical list of information elements we care about,
1271  * the filter code also gives us all changes to the Microsoft OUI
1272  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1273  *
1274  * We implement beacon filtering in software since that means we can
1275  * avoid processing the frame here and in cfg80211, and userspace
1276  * will not be able to tell whether the hardware supports it or not.
1277  *
1278  * XXX: This list needs to be dynamic -- userspace needs to be able to
1279  *      add items it requires. It also needs to be able to tell us to
1280  *      look out for other vendor IEs.
1281  */
1282 static const u64 care_about_ies =
1283         (1ULL << WLAN_EID_COUNTRY) |
1284         (1ULL << WLAN_EID_ERP_INFO) |
1285         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1286         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1287         (1ULL << WLAN_EID_HT_CAPABILITY) |
1288         (1ULL << WLAN_EID_HT_INFORMATION);
1289
1290 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1291                                      struct ieee80211_mgmt *mgmt,
1292                                      size_t len,
1293                                      struct ieee80211_rx_status *rx_status)
1294 {
1295         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1296         size_t baselen;
1297         struct ieee802_11_elems elems;
1298         struct ieee80211_local *local = sdata->local;
1299         u32 changed = 0;
1300         bool erp_valid, directed_tim = false;
1301         u8 erp_value = 0;
1302         u32 ncrc;
1303         u8 *bssid;
1304
1305         ASSERT_MGD_MTX(ifmgd);
1306
1307         /* Process beacon from the current BSS */
1308         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1309         if (baselen > len)
1310                 return;
1311
1312         if (rx_status->freq != local->hw.conf.channel->center_freq)
1313                 return;
1314
1315         /*
1316          * We might have received a number of frames, among them a
1317          * disassoc frame and a beacon...
1318          */
1319         if (!ifmgd->associated)
1320                 return;
1321
1322         bssid = ifmgd->associated->bssid;
1323
1324         /*
1325          * And in theory even frames from a different AP we were just
1326          * associated to a split-second ago!
1327          */
1328         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1329                 return;
1330
1331         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1332 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1333                 if (net_ratelimit()) {
1334                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1335                                "to a received beacon\n", sdata->name);
1336                 }
1337 #endif
1338                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1339                 mutex_lock(&local->iflist_mtx);
1340                 ieee80211_recalc_ps(local, -1);
1341                 mutex_unlock(&local->iflist_mtx);
1342         }
1343
1344         /*
1345          * Push the beacon loss detection into the future since
1346          * we are processing a beacon from the AP just now.
1347          */
1348         mod_beacon_timer(sdata);
1349
1350         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1351         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1352                                           len - baselen, &elems,
1353                                           care_about_ies, ncrc);
1354
1355         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1356                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1357                                                    ifmgd->aid);
1358
1359         if (ncrc != ifmgd->beacon_crc) {
1360                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1361                                       true);
1362
1363                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1364                                          elems.wmm_param_len);
1365         }
1366
1367         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1368                 if (directed_tim) {
1369                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1370                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1371                                 ieee80211_hw_config(local,
1372                                                     IEEE80211_CONF_CHANGE_PS);
1373                                 ieee80211_send_nullfunc(local, sdata, 0);
1374                         } else {
1375                                 local->pspolling = true;
1376
1377                                 /*
1378                                  * Here is assumed that the driver will be
1379                                  * able to send ps-poll frame and receive a
1380                                  * response even though power save mode is
1381                                  * enabled, but some drivers might require
1382                                  * to disable power save here. This needs
1383                                  * to be investigated.
1384                                  */
1385                                 ieee80211_send_pspoll(local, sdata);
1386                         }
1387                 }
1388         }
1389
1390         if (ncrc == ifmgd->beacon_crc)
1391                 return;
1392         ifmgd->beacon_crc = ncrc;
1393
1394         if (elems.erp_info && elems.erp_info_len >= 1) {
1395                 erp_valid = true;
1396                 erp_value = elems.erp_info[0];
1397         } else {
1398                 erp_valid = false;
1399         }
1400         changed |= ieee80211_handle_bss_capability(sdata,
1401                         le16_to_cpu(mgmt->u.beacon.capab_info),
1402                         erp_valid, erp_value);
1403
1404
1405         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1406             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1407                 struct sta_info *sta;
1408                 struct ieee80211_supported_band *sband;
1409                 u16 ap_ht_cap_flags;
1410
1411                 rcu_read_lock();
1412
1413                 sta = sta_info_get(sdata, bssid);
1414                 if (WARN_ON(!sta)) {
1415                         rcu_read_unlock();
1416                         return;
1417                 }
1418
1419                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1420
1421                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1422                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1423
1424                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1425
1426                 rcu_read_unlock();
1427
1428                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1429                                                bssid, ap_ht_cap_flags);
1430         }
1431
1432         /* Note: country IE parsing is done for us by cfg80211 */
1433         if (elems.country_elem) {
1434                 /* TODO: IBSS also needs this */
1435                 if (elems.pwr_constr_elem)
1436                         ieee80211_handle_pwr_constr(sdata,
1437                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1438                                 elems.pwr_constr_elem,
1439                                 elems.pwr_constr_elem_len);
1440         }
1441
1442         ieee80211_bss_info_change_notify(sdata, changed);
1443 }
1444
1445 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1446                                           struct sk_buff *skb)
1447 {
1448         struct ieee80211_local *local = sdata->local;
1449         struct ieee80211_mgmt *mgmt;
1450         u16 fc;
1451
1452         if (skb->len < 24)
1453                 return RX_DROP_MONITOR;
1454
1455         mgmt = (struct ieee80211_mgmt *) skb->data;
1456         fc = le16_to_cpu(mgmt->frame_control);
1457
1458         switch (fc & IEEE80211_FCTL_STYPE) {
1459         case IEEE80211_STYPE_PROBE_RESP:
1460         case IEEE80211_STYPE_BEACON:
1461         case IEEE80211_STYPE_DEAUTH:
1462         case IEEE80211_STYPE_DISASSOC:
1463         case IEEE80211_STYPE_ACTION:
1464                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1465                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1466                 return RX_QUEUED;
1467         }
1468
1469         return RX_DROP_MONITOR;
1470 }
1471
1472 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1473                                          struct sk_buff *skb)
1474 {
1475         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1476         struct ieee80211_rx_status *rx_status;
1477         struct ieee80211_mgmt *mgmt;
1478         enum rx_mgmt_action rma = RX_MGMT_NONE;
1479         u16 fc;
1480
1481         rx_status = (struct ieee80211_rx_status *) skb->cb;
1482         mgmt = (struct ieee80211_mgmt *) skb->data;
1483         fc = le16_to_cpu(mgmt->frame_control);
1484
1485         mutex_lock(&ifmgd->mtx);
1486
1487         if (ifmgd->associated &&
1488             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1489                 switch (fc & IEEE80211_FCTL_STYPE) {
1490                 case IEEE80211_STYPE_BEACON:
1491                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1492                                                  rx_status);
1493                         break;
1494                 case IEEE80211_STYPE_PROBE_RESP:
1495                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1496                         break;
1497                 case IEEE80211_STYPE_DEAUTH:
1498                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1499                         break;
1500                 case IEEE80211_STYPE_DISASSOC:
1501                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1502                         break;
1503                 case IEEE80211_STYPE_ACTION:
1504                         if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1505                                 break;
1506
1507                         ieee80211_sta_process_chanswitch(sdata,
1508                                         &mgmt->u.action.u.chan_switch.sw_elem,
1509                                         (void *)ifmgd->associated->priv);
1510                         break;
1511                 }
1512                 mutex_unlock(&ifmgd->mtx);
1513
1514                 switch (rma) {
1515                 case RX_MGMT_NONE:
1516                         /* no action */
1517                         break;
1518                 case RX_MGMT_CFG80211_DEAUTH:
1519                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1520                         break;
1521                 case RX_MGMT_CFG80211_DISASSOC:
1522                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1523                         break;
1524                 default:
1525                         WARN(1, "unexpected: %d", rma);
1526                 }
1527                 goto out;
1528         }
1529
1530         mutex_unlock(&ifmgd->mtx);
1531
1532         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1533             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1534                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1535
1536  out:
1537         kfree_skb(skb);
1538 }
1539
1540 static void ieee80211_sta_timer(unsigned long data)
1541 {
1542         struct ieee80211_sub_if_data *sdata =
1543                 (struct ieee80211_sub_if_data *) data;
1544         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1545         struct ieee80211_local *local = sdata->local;
1546
1547         if (local->quiescing) {
1548                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1549                 return;
1550         }
1551
1552         ieee80211_queue_work(&local->hw, &ifmgd->work);
1553 }
1554
1555 static void ieee80211_sta_work(struct work_struct *work)
1556 {
1557         struct ieee80211_sub_if_data *sdata =
1558                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1559         struct ieee80211_local *local = sdata->local;
1560         struct ieee80211_if_managed *ifmgd;
1561         struct sk_buff *skb;
1562
1563         if (!ieee80211_sdata_running(sdata))
1564                 return;
1565
1566         if (local->scanning)
1567                 return;
1568
1569         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1570                 return;
1571
1572         /*
1573          * ieee80211_queue_work() should have picked up most cases,
1574          * here we'll pick the the rest.
1575          */
1576         if (WARN(local->suspended, "STA MLME work scheduled while "
1577                  "going to suspend\n"))
1578                 return;
1579
1580         ifmgd = &sdata->u.mgd;
1581
1582         /* first process frames to avoid timing out while a frame is pending */
1583         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1584                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1585
1586         /* then process the rest of the work */
1587         mutex_lock(&ifmgd->mtx);
1588
1589         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1590                             IEEE80211_STA_CONNECTION_POLL) &&
1591             ifmgd->associated) {
1592                 u8 bssid[ETH_ALEN];
1593
1594                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1595                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1596                         run_again(ifmgd, ifmgd->probe_timeout);
1597
1598                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1599 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1600                         printk(KERN_DEBUG "No probe response from AP %pM"
1601                                 " after %dms, try %d\n", bssid,
1602                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1603                                 ifmgd->probe_send_count);
1604 #endif
1605                         ieee80211_mgd_probe_ap_send(sdata);
1606                 } else {
1607                         /*
1608                          * We actually lost the connection ... or did we?
1609                          * Let's make sure!
1610                          */
1611                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1612                                           IEEE80211_STA_BEACON_POLL);
1613                         printk(KERN_DEBUG "No probe response from AP %pM"
1614                                 " after %dms, disconnecting.\n",
1615                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1616                         ieee80211_set_disassoc(sdata);
1617                         ieee80211_recalc_idle(local);
1618                         mutex_unlock(&ifmgd->mtx);
1619                         /*
1620                          * must be outside lock due to cfg80211,
1621                          * but that's not a problem.
1622                          */
1623                         ieee80211_send_deauth_disassoc(sdata, bssid,
1624                                         IEEE80211_STYPE_DEAUTH,
1625                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1626                                         NULL);
1627                         mutex_lock(&ifmgd->mtx);
1628                 }
1629         }
1630
1631         mutex_unlock(&ifmgd->mtx);
1632 }
1633
1634 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1635 {
1636         struct ieee80211_sub_if_data *sdata =
1637                 (struct ieee80211_sub_if_data *) data;
1638         struct ieee80211_local *local = sdata->local;
1639
1640         if (local->quiescing)
1641                 return;
1642
1643         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1644 }
1645
1646 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1647 {
1648         struct ieee80211_sub_if_data *sdata =
1649                 (struct ieee80211_sub_if_data *) data;
1650         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1651         struct ieee80211_local *local = sdata->local;
1652
1653         if (local->quiescing)
1654                 return;
1655
1656         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1657 }
1658
1659 static void ieee80211_sta_monitor_work(struct work_struct *work)
1660 {
1661         struct ieee80211_sub_if_data *sdata =
1662                 container_of(work, struct ieee80211_sub_if_data,
1663                              u.mgd.monitor_work);
1664
1665         ieee80211_mgd_probe_ap(sdata, false);
1666 }
1667
1668 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1669 {
1670         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1671                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1672                                         IEEE80211_STA_CONNECTION_POLL);
1673
1674                 /* let's probe the connection once */
1675                 ieee80211_queue_work(&sdata->local->hw,
1676                            &sdata->u.mgd.monitor_work);
1677                 /* and do all the other regular work too */
1678                 ieee80211_queue_work(&sdata->local->hw,
1679                            &sdata->u.mgd.work);
1680         }
1681 }
1682
1683 #ifdef CONFIG_PM
1684 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1685 {
1686         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1687
1688         /*
1689          * we need to use atomic bitops for the running bits
1690          * only because both timers might fire at the same
1691          * time -- the code here is properly synchronised.
1692          */
1693
1694         cancel_work_sync(&ifmgd->work);
1695         cancel_work_sync(&ifmgd->beacon_loss_work);
1696         if (del_timer_sync(&ifmgd->timer))
1697                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1698
1699         cancel_work_sync(&ifmgd->chswitch_work);
1700         if (del_timer_sync(&ifmgd->chswitch_timer))
1701                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1702
1703         cancel_work_sync(&ifmgd->monitor_work);
1704         /* these will just be re-established on connection */
1705         del_timer_sync(&ifmgd->conn_mon_timer);
1706         del_timer_sync(&ifmgd->bcn_mon_timer);
1707 }
1708
1709 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1710 {
1711         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1712
1713         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1714                 add_timer(&ifmgd->timer);
1715         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1716                 add_timer(&ifmgd->chswitch_timer);
1717 }
1718 #endif
1719
1720 /* interface setup */
1721 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1722 {
1723         struct ieee80211_if_managed *ifmgd;
1724
1725         ifmgd = &sdata->u.mgd;
1726         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1727         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1728         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1729         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
1730         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1731                     (unsigned long) sdata);
1732         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1733                     (unsigned long) sdata);
1734         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1735                     (unsigned long) sdata);
1736         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1737                     (unsigned long) sdata);
1738         skb_queue_head_init(&ifmgd->skb_queue);
1739
1740         ifmgd->flags = 0;
1741
1742         mutex_init(&ifmgd->mtx);
1743
1744         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1745                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1746         else
1747                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1748 }
1749
1750 /* scan finished notification */
1751 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1752 {
1753         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1754
1755         /* Restart STA timers */
1756         rcu_read_lock();
1757         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1758                 ieee80211_restart_sta_timer(sdata);
1759         rcu_read_unlock();
1760 }
1761
1762 int ieee80211_max_network_latency(struct notifier_block *nb,
1763                                   unsigned long data, void *dummy)
1764 {
1765         s32 latency_usec = (s32) data;
1766         struct ieee80211_local *local =
1767                 container_of(nb, struct ieee80211_local,
1768                              network_latency_notifier);
1769
1770         mutex_lock(&local->iflist_mtx);
1771         ieee80211_recalc_ps(local, latency_usec);
1772         mutex_unlock(&local->iflist_mtx);
1773
1774         return 0;
1775 }
1776
1777 /* config hooks */
1778 static enum work_done_result
1779 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1780                           struct sk_buff *skb)
1781 {
1782         if (!skb) {
1783                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1784                 return WORK_DONE_DESTROY;
1785         }
1786
1787         if (wk->type == IEEE80211_WORK_AUTH) {
1788                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1789                 return WORK_DONE_DESTROY;
1790         }
1791
1792         mutex_lock(&wk->sdata->u.mgd.mtx);
1793         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1794         mutex_unlock(&wk->sdata->u.mgd.mtx);
1795
1796         wk->type = IEEE80211_WORK_AUTH;
1797         wk->probe_auth.tries = 0;
1798         return WORK_DONE_REQUEUE;
1799 }
1800
1801 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1802                        struct cfg80211_auth_request *req)
1803 {
1804         const u8 *ssid;
1805         struct ieee80211_work *wk;
1806         u16 auth_alg;
1807
1808         switch (req->auth_type) {
1809         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1810                 auth_alg = WLAN_AUTH_OPEN;
1811                 break;
1812         case NL80211_AUTHTYPE_SHARED_KEY:
1813                 auth_alg = WLAN_AUTH_SHARED_KEY;
1814                 break;
1815         case NL80211_AUTHTYPE_FT:
1816                 auth_alg = WLAN_AUTH_FT;
1817                 break;
1818         case NL80211_AUTHTYPE_NETWORK_EAP:
1819                 auth_alg = WLAN_AUTH_LEAP;
1820                 break;
1821         default:
1822                 return -EOPNOTSUPP;
1823         }
1824
1825         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1826         if (!wk)
1827                 return -ENOMEM;
1828
1829         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1830
1831         if (req->ie && req->ie_len) {
1832                 memcpy(wk->ie, req->ie, req->ie_len);
1833                 wk->ie_len = req->ie_len;
1834         }
1835
1836         if (req->key && req->key_len) {
1837                 wk->probe_auth.key_len = req->key_len;
1838                 wk->probe_auth.key_idx = req->key_idx;
1839                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1840         }
1841
1842         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1843         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1844         wk->probe_auth.ssid_len = ssid[1];
1845
1846         wk->probe_auth.algorithm = auth_alg;
1847         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1848
1849         /* if we already have a probe, don't probe again */
1850         if (req->bss->proberesp_ies)
1851                 wk->type = IEEE80211_WORK_AUTH;
1852         else
1853                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1854         wk->chan = req->bss->channel;
1855         wk->sdata = sdata;
1856         wk->done = ieee80211_probe_auth_done;
1857
1858         ieee80211_add_work(wk);
1859         return 0;
1860 }
1861
1862 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1863                                                   struct sk_buff *skb)
1864 {
1865         struct ieee80211_mgmt *mgmt;
1866         u16 status;
1867
1868         if (!skb) {
1869                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1870                 return WORK_DONE_DESTROY;
1871         }
1872
1873         mgmt = (void *)skb->data;
1874         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1875
1876         if (status == WLAN_STATUS_SUCCESS) {
1877                 mutex_lock(&wk->sdata->u.mgd.mtx);
1878                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1879                         mutex_unlock(&wk->sdata->u.mgd.mtx);
1880                         /* oops -- internal error -- send timeout for now */
1881                         cfg80211_send_assoc_timeout(wk->sdata->dev,
1882                                                     wk->filter_ta);
1883                         return WORK_DONE_DESTROY;
1884                 }
1885                 mutex_unlock(&wk->sdata->u.mgd.mtx);
1886         }
1887
1888         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1889         return WORK_DONE_DESTROY;
1890 }
1891
1892 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1893                         struct cfg80211_assoc_request *req)
1894 {
1895         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1896         struct ieee80211_bss *bss = (void *)req->bss->priv;
1897         struct ieee80211_work *wk;
1898         const u8 *ssid;
1899         int i;
1900
1901         mutex_lock(&ifmgd->mtx);
1902         if (ifmgd->associated) {
1903                 if (!req->prev_bssid ||
1904                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
1905                            ETH_ALEN)) {
1906                         /*
1907                          * We are already associated and the request was not a
1908                          * reassociation request from the current BSS, so
1909                          * reject it.
1910                          */
1911                         mutex_unlock(&ifmgd->mtx);
1912                         return -EALREADY;
1913                 }
1914
1915                 /* Trying to reassociate - clear previous association state */
1916                 ieee80211_set_disassoc(sdata);
1917         }
1918         mutex_unlock(&ifmgd->mtx);
1919
1920         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1921         if (!wk)
1922                 return -ENOMEM;
1923
1924         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
1925         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1926
1927         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
1928                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
1929                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
1930                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
1931                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
1932
1933
1934         if (req->ie && req->ie_len) {
1935                 memcpy(wk->ie, req->ie, req->ie_len);
1936                 wk->ie_len = req->ie_len;
1937         } else
1938                 wk->ie_len = 0;
1939
1940         wk->assoc.bss = req->bss;
1941
1942         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1943
1944         /* new association always uses requested smps mode */
1945         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
1946                 if (ifmgd->powersave)
1947                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
1948                 else
1949                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
1950         } else
1951                 ifmgd->ap_smps = ifmgd->req_smps;
1952
1953         wk->assoc.smps = ifmgd->ap_smps;
1954         /*
1955          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
1956          * We still associate in non-HT mode (11a/b/g) if any one of these
1957          * ciphers is configured as pairwise.
1958          * We can set this to true for non-11n hardware, that'll be checked
1959          * separately along with the peer capabilities.
1960          */
1961         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
1962         wk->assoc.capability = req->bss->capability;
1963         wk->assoc.wmm_used = bss->wmm_used;
1964         wk->assoc.supp_rates = bss->supp_rates;
1965         wk->assoc.supp_rates_len = bss->supp_rates_len;
1966         wk->assoc.ht_information_ie =
1967                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
1968
1969         if (bss->wmm_used && bss->uapsd_supported &&
1970             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
1971                 wk->assoc.uapsd_used = true;
1972                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
1973         } else {
1974                 wk->assoc.uapsd_used = false;
1975                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
1976         }
1977
1978         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1979         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
1980         wk->assoc.ssid_len = ssid[1];
1981
1982         if (req->prev_bssid)
1983                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
1984
1985         wk->type = IEEE80211_WORK_ASSOC;
1986         wk->chan = req->bss->channel;
1987         wk->sdata = sdata;
1988         wk->done = ieee80211_assoc_done;
1989
1990         if (req->use_mfp) {
1991                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
1992                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
1993         } else {
1994                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
1995                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
1996         }
1997
1998         if (req->crypto.control_port)
1999                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2000         else
2001                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2002
2003         ieee80211_add_work(wk);
2004         return 0;
2005 }
2006
2007 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2008                          struct cfg80211_deauth_request *req,
2009                          void *cookie)
2010 {
2011         struct ieee80211_local *local = sdata->local;
2012         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2013         struct ieee80211_work *wk;
2014         const u8 *bssid = req->bss->bssid;
2015
2016         mutex_lock(&ifmgd->mtx);
2017
2018         if (ifmgd->associated == req->bss) {
2019                 bssid = req->bss->bssid;
2020                 ieee80211_set_disassoc(sdata);
2021                 mutex_unlock(&ifmgd->mtx);
2022         } else {
2023                 bool not_auth_yet = false;
2024
2025                 mutex_unlock(&ifmgd->mtx);
2026
2027                 mutex_lock(&local->work_mtx);
2028                 list_for_each_entry(wk, &local->work_list, list) {
2029                         if (wk->sdata != sdata)
2030                                 continue;
2031
2032                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2033                             wk->type != IEEE80211_WORK_AUTH)
2034                                 continue;
2035
2036                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2037                                 continue;
2038
2039                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2040                         list_del_rcu(&wk->list);
2041                         free_work(wk);
2042                         break;
2043                 }
2044                 mutex_unlock(&local->work_mtx);
2045
2046                 /*
2047                  * If somebody requests authentication and we haven't
2048                  * sent out an auth frame yet there's no need to send
2049                  * out a deauth frame either. If the state was PROBE,
2050                  * then this is the case. If it's AUTH we have sent a
2051                  * frame, and if it's IDLE we have completed the auth
2052                  * process already.
2053                  */
2054                 if (not_auth_yet) {
2055                         __cfg80211_auth_canceled(sdata->dev, bssid);
2056                         return 0;
2057                 }
2058         }
2059
2060         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2061                sdata->name, bssid, req->reason_code);
2062
2063         ieee80211_send_deauth_disassoc(sdata, bssid,
2064                         IEEE80211_STYPE_DEAUTH, req->reason_code,
2065                         cookie);
2066
2067         ieee80211_recalc_idle(sdata->local);
2068
2069         return 0;
2070 }
2071
2072 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2073                            struct cfg80211_disassoc_request *req,
2074                            void *cookie)
2075 {
2076         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2077
2078         mutex_lock(&ifmgd->mtx);
2079
2080         /*
2081          * cfg80211 should catch this ... but it's racy since
2082          * we can receive a disassoc frame, process it, hand it
2083          * to cfg80211 while that's in a locked section already
2084          * trying to tell us that the user wants to disconnect.
2085          */
2086         if (ifmgd->associated != req->bss) {
2087                 mutex_unlock(&ifmgd->mtx);
2088                 return -ENOLINK;
2089         }
2090
2091         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2092                sdata->name, req->bss->bssid, req->reason_code);
2093
2094         ieee80211_set_disassoc(sdata);
2095
2096         mutex_unlock(&ifmgd->mtx);
2097
2098         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2099                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2100                         cookie);
2101
2102         ieee80211_recalc_idle(sdata->local);
2103
2104         return 0;
2105 }
2106
2107 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2108                          struct ieee80211_channel *chan,
2109                          enum nl80211_channel_type channel_type,
2110                          const u8 *buf, size_t len, u64 *cookie)
2111 {
2112         struct ieee80211_local *local = sdata->local;
2113         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2114         struct sk_buff *skb;
2115
2116         /* Check that we are on the requested channel for transmission */
2117         if ((chan != local->tmp_channel ||
2118              channel_type != local->tmp_channel_type) &&
2119             (chan != local->oper_channel ||
2120              channel_type != local->oper_channel_type))
2121                 return -EBUSY;
2122
2123         skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2124         if (!skb)
2125                 return -ENOMEM;
2126         skb_reserve(skb, local->hw.extra_tx_headroom);
2127
2128         memcpy(skb_put(skb, len), buf, len);
2129
2130         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2131                 IEEE80211_SKB_CB(skb)->flags |=
2132                         IEEE80211_TX_INTFL_DONT_ENCRYPT;
2133         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2134                 IEEE80211_TX_CTL_REQ_TX_STATUS;
2135         skb->dev = sdata->dev;
2136         ieee80211_tx_skb(sdata, skb);
2137
2138         *cookie = (unsigned long) skb;
2139         return 0;
2140 }