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