net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/pm_qos_params.h>
  21 #include <linux/crc32.h>
  22 #include <net/mac80211.h>
  23 #include <asm/unaligned.h>
  24
  25 #include "ieee80211_i.h"
  26 #include "driver-ops.h"
  27 #include "rate.h"
  28 #include "led.h"
  29
  30 #define IEEE80211_MAX_PROBE_TRIES 5
  31
  32 /*
  33  * beacon loss detection timeout
  34  * XXX: should depend on beacon interval
  35  */
  36 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
  37 /*
  38  * Time the connection can be idle before we probe
  39  * it to see if we can still talk to the AP.
  40  */
  41 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  42 /*
  43  * Time we wait for a probe response after sending
  44  * a probe request because of beacon loss or for
  45  * checking the connection still works.
  46  */
  47 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  48
  49 /*
  50  * Weight given to the latest Beacon frame when calculating average signal
  51  * strength for Beacon frames received in the current BSS. This must be
  52  * between 1 and 15.
  53  */
  54 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  55
  56 #define TMR_RUNNING_TIMER       0
  57 #define TMR_RUNNING_CHANSW      1
  58
  59 /*
  60  * All cfg80211 functions have to be called outside a locked
  61  * section so that they can acquire a lock themselves... This
  62  * is much simpler than queuing up things in cfg80211, but we
  63  * do need some indirection for that here.
  64  */
  65 enum rx_mgmt_action {
  66         /* no action required */
  67         RX_MGMT_NONE,
  68
  69         /* caller must call cfg80211_send_rx_auth() */
  70         RX_MGMT_CFG80211_AUTH,
  71
  72         /* caller must call cfg80211_send_rx_assoc() */
  73         RX_MGMT_CFG80211_ASSOC,
  74
  75         /* caller must call cfg80211_send_deauth() */
  76         RX_MGMT_CFG80211_DEAUTH,
  77
  78         /* caller must call cfg80211_send_disassoc() */
  79         RX_MGMT_CFG80211_DISASSOC,
  80
  81         /* caller must tell cfg80211 about internal error */
  82         RX_MGMT_CFG80211_ASSOC_ERROR,
  83 };
  84
  85 /* utils */
  86 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  87 {
  88         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  89 }
  90
  91 /*
  92  * We can have multiple work items (and connection probing)
  93  * scheduling this timer, but we need to take care to only
  94  * reschedule it when it should fire _earlier_ than it was
  95  * asked for before, or if it's not pending right now. This
  96  * function ensures that. Note that it then is required to
  97  * run this function for all timeouts after the first one
  98  * has happened -- the work that runs from this timer will
  99  * do that.
 100  */
 101 static void run_again(struct ieee80211_if_managed *ifmgd,
 102                              unsigned long timeout)
 103 {
 104         ASSERT_MGD_MTX(ifmgd);
 105
 106         if (!timer_pending(&ifmgd->timer) ||
 107             time_before(timeout, ifmgd->timer.expires))
 108                 mod_timer(&ifmgd->timer, timeout);
 109 }
 110
 111 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 112 {
 113         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 114                 return;
 115
 116         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 117                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 118 }
 119
 120 static int ecw2cw(int ecw)
 121 {
 122         return (1 << ecw) - 1;
 123 }
 124
 125 /*
 126  * ieee80211_enable_ht should be called only after the operating band
 127  * has been determined as ht configuration depends on the hw's
 128  * HT abilities for a specific band.
 129  */
 130 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 131                                struct ieee80211_ht_info *hti,
 132                                const u8 *bssid, u16 ap_ht_cap_flags)
 133 {
 134         struct ieee80211_local *local = sdata->local;
 135         struct ieee80211_supported_band *sband;
 136         struct sta_info *sta;
 137         u32 changed = 0;
 138         u16 ht_opmode;
 139         bool enable_ht = true, ht_changed;
 140         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 141
 142         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 143
 144         /* HT is not supported */
 145         if (!sband->ht_cap.ht_supported)
 146                 enable_ht = false;
 147
 148         /* check that channel matches the right operating channel */
 149         if (local->hw.conf.channel->center_freq !=
 150             ieee80211_channel_to_frequency(hti->control_chan))
 151                 enable_ht = false;
 152
 153         if (enable_ht) {
 154                 channel_type = NL80211_CHAN_HT20;
 155
 156                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 157                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 158                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 159                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 160                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 161                                 if (!(local->hw.conf.channel->flags &
 162                                     IEEE80211_CHAN_NO_HT40PLUS))
 163                                         channel_type = NL80211_CHAN_HT40PLUS;
 164                                 break;
 165                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 166                                 if (!(local->hw.conf.channel->flags &
 167                                     IEEE80211_CHAN_NO_HT40MINUS))
 168                                         channel_type = NL80211_CHAN_HT40MINUS;
 169                                 break;
 170                         }
 171                 }
 172         }
 173
 174         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 175                      channel_type != local->hw.conf.channel_type;
 176
 177         local->oper_channel_type = channel_type;
 178
 179         if (ht_changed) {
 180                 /* channel_type change automatically detected */
 181                 ieee80211_hw_config(local, 0);
 182
 183                 rcu_read_lock();
 184                 sta = sta_info_get(sdata, bssid);
 185                 if (sta)
 186                         rate_control_rate_update(local, sband, sta,
 187                                                  IEEE80211_RC_HT_CHANGED,
 188                                                  local->oper_channel_type);
 189                 rcu_read_unlock();
 190         }
 191
 192         /* disable HT */
 193         if (!enable_ht)
 194                 return 0;
 195
 196         ht_opmode = le16_to_cpu(hti->operation_mode);
 197
 198         /* if bss configuration changed store the new one */
 199         if (!sdata->ht_opmode_valid ||
 200             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 201                 changed |= BSS_CHANGED_HT;
 202                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 203                 sdata->ht_opmode_valid = true;
 204         }
 205
 206         return changed;
 207 }
 208
 209 /* frame sending functions */
 210
 211 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 212                                            const u8 *bssid, u16 stype, u16 reason,
 213                                            void *cookie, bool send_frame)
 214 {
 215         struct ieee80211_local *local = sdata->local;
 216         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 217         struct sk_buff *skb;
 218         struct ieee80211_mgmt *mgmt;
 219
 220         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 221         if (!skb) {
 222                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 223                        "deauth/disassoc frame\n", sdata->name);
 224                 return;
 225         }
 226         skb_reserve(skb, local->hw.extra_tx_headroom);
 227
 228         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 229         memset(mgmt, 0, 24);
 230         memcpy(mgmt->da, bssid, ETH_ALEN);
 231         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 232         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 233         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 234         skb_put(skb, 2);
 235         /* u.deauth.reason_code == u.disassoc.reason_code */
 236         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 237
 238         if (stype == IEEE80211_STYPE_DEAUTH)
 239                 if (cookie)
 240                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 241                 else
 242                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 243         else
 244                 if (cookie)
 245                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 246                 else
 247                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 248         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 249                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 250
 251         if (send_frame)
 252                 ieee80211_tx_skb(sdata, skb);
 253         else
 254                 kfree_skb(skb);
 255 }
 256
 257 void ieee80211_send_pspoll(struct ieee80211_local *local,
 258                            struct ieee80211_sub_if_data *sdata)
 259 {
 260         struct ieee80211_pspoll *pspoll;
 261         struct sk_buff *skb;
 262
 263         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 264         if (!skb)
 265                 return;
 266
 267         pspoll = (struct ieee80211_pspoll *) skb->data;
 268         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 269
 270         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 271         ieee80211_tx_skb(sdata, skb);
 272 }
 273
 274 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 275                              struct ieee80211_sub_if_data *sdata,
 276                              int powersave)
 277 {
 278         struct sk_buff *skb;
 279         struct ieee80211_hdr_3addr *nullfunc;
 280
 281         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 282         if (!skb)
 283                 return;
 284
 285         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 286         if (powersave)
 287                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 288
 289         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 290         ieee80211_tx_skb(sdata, skb);
 291 }
 292
 293 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 294                                           struct ieee80211_sub_if_data *sdata)
 295 {
 296         struct sk_buff *skb;
 297         struct ieee80211_hdr *nullfunc;
 298         __le16 fc;
 299
 300         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 301                 return;
 302
 303         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 304         if (!skb) {
 305                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 306                        "nullfunc frame\n", sdata->name);
 307                 return;
 308         }
 309         skb_reserve(skb, local->hw.extra_tx_headroom);
 310
 311         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 312         memset(nullfunc, 0, 30);
 313         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 314                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 315         nullfunc->frame_control = fc;
 316         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 317         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 318         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 319         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 320
 321         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 322         ieee80211_tx_skb(sdata, skb);
 323 }
 324
 325 /* spectrum management related things */
 326 static void ieee80211_chswitch_work(struct work_struct *work)
 327 {
 328         struct ieee80211_sub_if_data *sdata =
 329                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 330         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 331
 332         if (!ieee80211_sdata_running(sdata))
 333                 return;
 334
 335         mutex_lock(&ifmgd->mtx);
 336         if (!ifmgd->associated)
 337                 goto out;
 338
 339         sdata->local->oper_channel = sdata->local->csa_channel;
 340         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
 341
 342         /* XXX: shouldn't really modify cfg80211-owned data! */
 343         ifmgd->associated->channel = sdata->local->oper_channel;
 344
 345         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 346                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 347  out:
 348         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 349         mutex_unlock(&ifmgd->mtx);
 350 }
 351
 352 static void ieee80211_chswitch_timer(unsigned long data)
 353 {
 354         struct ieee80211_sub_if_data *sdata =
 355                 (struct ieee80211_sub_if_data *) data;
 356         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 357
 358         if (sdata->local->quiescing) {
 359                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 360                 return;
 361         }
 362
 363         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 364 }
 365
 366 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 367                                       struct ieee80211_channel_sw_ie *sw_elem,
 368                                       struct ieee80211_bss *bss)
 369 {
 370         struct cfg80211_bss *cbss =
 371                 container_of((void *)bss, struct cfg80211_bss, priv);
 372         struct ieee80211_channel *new_ch;
 373         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 374         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 375
 376         ASSERT_MGD_MTX(ifmgd);
 377
 378         if (!ifmgd->associated)
 379                 return;
 380
 381         if (sdata->local->scanning)
 382                 return;
 383
 384         /* Disregard subsequent beacons if we are already running a timer
 385            processing a CSA */
 386
 387         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 388                 return;
 389
 390         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 391         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 392                 return;
 393
 394         sdata->local->csa_channel = new_ch;
 395
 396         if (sw_elem->count <= 1) {
 397                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 398         } else {
 399                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 400                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 401                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 402                 mod_timer(&ifmgd->chswitch_timer,
 403                           jiffies +
 404                           msecs_to_jiffies(sw_elem->count *
 405                                            cbss->beacon_interval));
 406         }
 407 }
 408
 409 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 410                                         u16 capab_info, u8 *pwr_constr_elem,
 411                                         u8 pwr_constr_elem_len)
 412 {
 413         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 414
 415         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 416                 return;
 417
 418         /* Power constraint IE length should be 1 octet */
 419         if (pwr_constr_elem_len != 1)
 420                 return;
 421
 422         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 423             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 424                 sdata->local->power_constr_level = *pwr_constr_elem;
 425                 ieee80211_hw_config(sdata->local, 0);
 426         }
 427 }
 428
 429 /* powersave */
 430 static void ieee80211_enable_ps(struct ieee80211_local *local,
 431                                 struct ieee80211_sub_if_data *sdata)
 432 {
 433         struct ieee80211_conf *conf = &local->hw.conf;
 434
 435         /*
 436          * If we are scanning right now then the parameters will
 437          * take effect when scan finishes.
 438          */
 439         if (local->scanning)
 440                 return;
 441
 442         if (conf->dynamic_ps_timeout > 0 &&
 443             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 444                 mod_timer(&local->dynamic_ps_timer, jiffies +
 445                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 446         } else {
 447                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 448                         ieee80211_send_nullfunc(local, sdata, 1);
 449
 450                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 451                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 452                         return;
 453
 454                 conf->flags |= IEEE80211_CONF_PS;
 455                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 456         }
 457 }
 458
 459 static void ieee80211_change_ps(struct ieee80211_local *local)
 460 {
 461         struct ieee80211_conf *conf = &local->hw.conf;
 462
 463         if (local->ps_sdata) {
 464                 ieee80211_enable_ps(local, local->ps_sdata);
 465         } else if (conf->flags & IEEE80211_CONF_PS) {
 466                 conf->flags &= ~IEEE80211_CONF_PS;
 467                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 468                 del_timer_sync(&local->dynamic_ps_timer);
 469                 cancel_work_sync(&local->dynamic_ps_enable_work);
 470         }
 471 }
 472
 473 /* need to hold RTNL or interface lock */
 474 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 475 {
 476         struct ieee80211_sub_if_data *sdata, *found = NULL;
 477         int count = 0;
 478
 479         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 480                 local->ps_sdata = NULL;
 481                 return;
 482         }
 483
 484         if (!list_empty(&local->work_list)) {
 485                 local->ps_sdata = NULL;
 486                 goto change;
 487         }
 488
 489         list_for_each_entry(sdata, &local->interfaces, list) {
 490                 if (!ieee80211_sdata_running(sdata))
 491                         continue;
 492                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 493                         continue;
 494                 found = sdata;
 495                 count++;
 496         }
 497
 498         if (count == 1 && found->u.mgd.powersave &&
 499             found->u.mgd.associated &&
 500             found->u.mgd.associated->beacon_ies &&
 501             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 502                                     IEEE80211_STA_CONNECTION_POLL))) {
 503                 s32 beaconint_us;
 504
 505                 if (latency < 0)
 506                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 507
 508                 beaconint_us = ieee80211_tu_to_usec(
 509                                         found->vif.bss_conf.beacon_int);
 510
 511                 if (beaconint_us > latency) {
 512                         local->ps_sdata = NULL;
 513                 } else {
 514                         struct ieee80211_bss *bss;
 515                         int maxslp = 1;
 516                         u8 dtimper;
 517
 518                         bss = (void *)found->u.mgd.associated->priv;
 519                         dtimper = bss->dtim_period;
 520
 521                         /* If the TIM IE is invalid, pretend the value is 1 */
 522                         if (!dtimper)
 523                                 dtimper = 1;
 524                         else if (dtimper > 1)
 525                                 maxslp = min_t(int, dtimper,
 526                                                     latency / beaconint_us);
 527
 528                         local->hw.conf.max_sleep_period = maxslp;
 529                         local->hw.conf.ps_dtim_period = dtimper;
 530                         local->ps_sdata = found;
 531                 }
 532         } else {
 533                 local->ps_sdata = NULL;
 534         }
 535
 536  change:
 537         ieee80211_change_ps(local);
 538 }
 539
 540 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 541 {
 542         struct ieee80211_local *local =
 543                 container_of(work, struct ieee80211_local,
 544                              dynamic_ps_disable_work);
 545
 546         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 547                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 548                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 549         }
 550
 551         ieee80211_wake_queues_by_reason(&local->hw,
 552                                         IEEE80211_QUEUE_STOP_REASON_PS);
 553 }
 554
 555 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 556 {
 557         struct ieee80211_local *local =
 558                 container_of(work, struct ieee80211_local,
 559                              dynamic_ps_enable_work);
 560         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 561         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 562
 563         /* can only happen when PS was just disabled anyway */
 564         if (!sdata)
 565                 return;
 566
 567         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 568                 return;
 569
 570         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 571             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 572                 ieee80211_send_nullfunc(local, sdata, 1);
 573
 574         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 575               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 576             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 577                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 578                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 579                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 580         }
 581 }
 582
 583 void ieee80211_dynamic_ps_timer(unsigned long data)
 584 {
 585         struct ieee80211_local *local = (void *) data;
 586
 587         if (local->quiescing || local->suspended)
 588                 return;
 589
 590         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 591 }
 592
 593 /* MLME */
 594 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 595                                      struct ieee80211_if_managed *ifmgd,
 596                                      u8 *wmm_param, size_t wmm_param_len)
 597 {
 598         struct ieee80211_tx_queue_params params;
 599         size_t left;
 600         int count;
 601         u8 *pos, uapsd_queues = 0;
 602
 603         if (!local->ops->conf_tx)
 604                 return;
 605
 606         if (local->hw.queues < 4)
 607                 return;
 608
 609         if (!wmm_param)
 610                 return;
 611
 612         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 613                 return;
 614
 615         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 616                 uapsd_queues = local->uapsd_queues;
 617
 618         count = wmm_param[6] & 0x0f;
 619         if (count == ifmgd->wmm_last_param_set)
 620                 return;
 621         ifmgd->wmm_last_param_set = count;
 622
 623         pos = wmm_param + 8;
 624         left = wmm_param_len - 8;
 625
 626         memset(&params, 0, sizeof(params));
 627
 628         local->wmm_acm = 0;
 629         for (; left >= 4; left -= 4, pos += 4) {
 630                 int aci = (pos[0] >> 5) & 0x03;
 631                 int acm = (pos[0] >> 4) & 0x01;
 632                 bool uapsd = false;
 633                 int queue;
 634
 635                 switch (aci) {
 636                 case 1: /* AC_BK */
 637                         queue = 3;
 638                         if (acm)
 639                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 640                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 641                                 uapsd = true;
 642                         break;
 643                 case 2: /* AC_VI */
 644                         queue = 1;
 645                         if (acm)
 646                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 647                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 648                                 uapsd = true;
 649                         break;
 650                 case 3: /* AC_VO */
 651                         queue = 0;
 652                         if (acm)
 653                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 654                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 655                                 uapsd = true;
 656                         break;
 657                 case 0: /* AC_BE */
 658                 default:
 659                         queue = 2;
 660                         if (acm)
 661                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 662                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 663                                 uapsd = true;
 664                         break;
 665                 }
 666
 667                 params.aifs = pos[0] & 0x0f;
 668                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 669                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 670                 params.txop = get_unaligned_le16(pos + 2);
 671                 params.uapsd = uapsd;
 672
 673 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 674                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 675                        "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 676                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 677                        params.aifs, params.cw_min, params.cw_max, params.txop,
 678                        params.uapsd);
 679 #endif
 680                 if (drv_conf_tx(local, queue, &params))
 681                         printk(KERN_DEBUG "%s: failed to set TX queue "
 682                                "parameters for queue %d\n",
 683                                wiphy_name(local->hw.wiphy), queue);
 684         }
 685
 686         /* enable WMM or activate new settings */
 687         local->hw.conf.flags |= IEEE80211_CONF_QOS;
 688         drv_config(local, IEEE80211_CONF_CHANGE_QOS);
 689 }
 690
 691 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 692                                            u16 capab, bool erp_valid, u8 erp)
 693 {
 694         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 695         u32 changed = 0;
 696         bool use_protection;
 697         bool use_short_preamble;
 698         bool use_short_slot;
 699
 700         if (erp_valid) {
 701                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 702                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 703         } else {
 704                 use_protection = false;
 705                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 706         }
 707
 708         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 709         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 710                 use_short_slot = true;
 711
 712         if (use_protection != bss_conf->use_cts_prot) {
 713                 bss_conf->use_cts_prot = use_protection;
 714                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 715         }
 716
 717         if (use_short_preamble != bss_conf->use_short_preamble) {
 718                 bss_conf->use_short_preamble = use_short_preamble;
 719                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 720         }
 721
 722         if (use_short_slot != bss_conf->use_short_slot) {
 723                 bss_conf->use_short_slot = use_short_slot;
 724                 changed |= BSS_CHANGED_ERP_SLOT;
 725         }
 726
 727         return changed;
 728 }
 729
 730 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 731                                      struct cfg80211_bss *cbss,
 732                                      u32 bss_info_changed)
 733 {
 734         struct ieee80211_bss *bss = (void *)cbss->priv;
 735         struct ieee80211_local *local = sdata->local;
 736
 737         bss_info_changed |= BSS_CHANGED_ASSOC;
 738         /* set timing information */
 739         sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
 740         sdata->vif.bss_conf.timestamp = cbss->tsf;
 741
 742         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 743         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 744                 cbss->capability, bss->has_erp_value, bss->erp_value);
 745
 746         sdata->u.mgd.associated = cbss;
 747         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 748
 749         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 750
 751         /* just to be sure */
 752         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 753                                 IEEE80211_STA_BEACON_POLL);
 754
 755         /*
 756          * Always handle WMM once after association regardless
 757          * of the first value the AP uses. Setting -1 here has
 758          * that effect because the AP values is an unsigned
 759          * 4-bit value.
 760          */
 761         sdata->u.mgd.wmm_last_param_set = -1;
 762
 763         ieee80211_led_assoc(local, 1);
 764
 765         sdata->vif.bss_conf.assoc = 1;
 766         /*
 767          * For now just always ask the driver to update the basic rateset
 768          * when we have associated, we aren't checking whether it actually
 769          * changed or not.
 770          */
 771         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 772
 773         /* And the BSSID changed - we're associated now */
 774         bss_info_changed |= BSS_CHANGED_BSSID;
 775
 776         /* Tell the driver to monitor connection quality (if supported) */
 777         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 778             sdata->vif.bss_conf.cqm_rssi_thold)
 779                 bss_info_changed |= BSS_CHANGED_CQM;
 780
 781         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 782
 783         mutex_lock(&local->iflist_mtx);
 784         ieee80211_recalc_ps(local, -1);
 785         ieee80211_recalc_smps(local, sdata);
 786         mutex_unlock(&local->iflist_mtx);
 787
 788         netif_tx_start_all_queues(sdata->dev);
 789         netif_carrier_on(sdata->dev);
 790 }
 791
 792 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 793                                    bool remove_sta)
 794 {
 795         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 796         struct ieee80211_local *local = sdata->local;
 797         struct sta_info *sta;
 798         u32 changed = 0, config_changed = 0;
 799         u8 bssid[ETH_ALEN];
 800
 801         ASSERT_MGD_MTX(ifmgd);
 802
 803         if (WARN_ON(!ifmgd->associated))
 804                 return;
 805
 806         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 807
 808         ifmgd->associated = NULL;
 809         memset(ifmgd->bssid, 0, ETH_ALEN);
 810
 811         /*
 812          * we need to commit the associated = NULL change because the
 813          * scan code uses that to determine whether this iface should
 814          * go to/wake up from powersave or not -- and could otherwise
 815          * wake the queues erroneously.
 816          */
 817         smp_mb();
 818
 819         /*
 820          * Thus, we can only afterwards stop the queues -- to account
 821          * for the case where another CPU is finishing a scan at this
 822          * time -- we don't want the scan code to enable queues.
 823          */
 824
 825         netif_tx_stop_all_queues(sdata->dev);
 826         netif_carrier_off(sdata->dev);
 827
 828         rcu_read_lock();
 829         sta = sta_info_get(sdata, bssid);
 830         if (sta) {
 831                 set_sta_flags(sta, WLAN_STA_DISASSOC);
 832                 ieee80211_sta_tear_down_BA_sessions(sta);
 833         }
 834         rcu_read_unlock();
 835
 836         changed |= ieee80211_reset_erp_info(sdata);
 837
 838         ieee80211_led_assoc(local, 0);
 839         changed |= BSS_CHANGED_ASSOC;
 840         sdata->vif.bss_conf.assoc = false;
 841
 842         ieee80211_set_wmm_default(sdata);
 843
 844         /* channel(_type) changes are handled by ieee80211_hw_config */
 845         local->oper_channel_type = NL80211_CHAN_NO_HT;
 846
 847         /* on the next assoc, re-program HT parameters */
 848         sdata->ht_opmode_valid = false;
 849
 850         local->power_constr_level = 0;
 851
 852         del_timer_sync(&local->dynamic_ps_timer);
 853         cancel_work_sync(&local->dynamic_ps_enable_work);
 854
 855         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 856                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 857                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 858         }
 859
 860         ieee80211_hw_config(local, config_changed);
 861
 862         /* And the BSSID changed -- not very interesting here */
 863         changed |= BSS_CHANGED_BSSID;
 864         ieee80211_bss_info_change_notify(sdata, changed);
 865
 866         if (remove_sta)
 867                 sta_info_destroy_addr(sdata, bssid);
 868 }
 869
 870 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 871                              struct ieee80211_hdr *hdr)
 872 {
 873         /*
 874          * We can postpone the mgd.timer whenever receiving unicast frames
 875          * from AP because we know that the connection is working both ways
 876          * at that time. But multicast frames (and hence also beacons) must
 877          * be ignored here, because we need to trigger the timer during
 878          * data idle periods for sending the periodic probe request to the
 879          * AP we're connected to.
 880          */
 881         if (is_multicast_ether_addr(hdr->addr1))
 882                 return;
 883
 884         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 885                 return;
 886
 887         mod_timer(&sdata->u.mgd.conn_mon_timer,
 888                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 889 }
 890
 891 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
 892 {
 893         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 894         const u8 *ssid;
 895
 896         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
 897         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
 898                                  ssid + 2, ssid[1], NULL, 0);
 899
 900         ifmgd->probe_send_count++;
 901         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
 902         run_again(ifmgd, ifmgd->probe_timeout);
 903 }
 904
 905 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
 906                                    bool beacon)
 907 {
 908         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 909         bool already = false;
 910
 911         if (!ieee80211_sdata_running(sdata))
 912                 return;
 913
 914         if (sdata->local->scanning)
 915                 return;
 916
 917         if (sdata->local->tmp_channel)
 918                 return;
 919
 920         mutex_lock(&ifmgd->mtx);
 921
 922         if (!ifmgd->associated)
 923                 goto out;
 924
 925 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 926         if (beacon && net_ratelimit())
 927                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
 928                        "- sending probe request\n", sdata->name);
 929 #endif
 930
 931         /*
 932          * The driver/our work has already reported this event or the
 933          * connection monitoring has kicked in and we have already sent
 934          * a probe request. Or maybe the AP died and the driver keeps
 935          * reporting until we disassociate...
 936          *
 937          * In either case we have to ignore the current call to this
 938          * function (except for setting the correct probe reason bit)
 939          * because otherwise we would reset the timer every time and
 940          * never check whether we received a probe response!
 941          */
 942         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 943                             IEEE80211_STA_CONNECTION_POLL))
 944                 already = true;
 945
 946         if (beacon)
 947                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
 948         else
 949                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
 950
 951         if (already)
 952                 goto out;
 953
 954         mutex_lock(&sdata->local->iflist_mtx);
 955         ieee80211_recalc_ps(sdata->local, -1);
 956         mutex_unlock(&sdata->local->iflist_mtx);
 957
 958         ifmgd->probe_send_count = 0;
 959         ieee80211_mgd_probe_ap_send(sdata);
 960  out:
 961         mutex_unlock(&ifmgd->mtx);
 962 }
 963
 964 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
 965 {
 966         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 967         struct ieee80211_local *local = sdata->local;
 968         u8 bssid[ETH_ALEN];
 969
 970         mutex_lock(&ifmgd->mtx);
 971         if (!ifmgd->associated) {
 972                 mutex_unlock(&ifmgd->mtx);
 973                 return;
 974         }
 975
 976         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 977
 978         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
 979
 980         ieee80211_set_disassoc(sdata, true);
 981         ieee80211_recalc_idle(local);
 982         mutex_unlock(&ifmgd->mtx);
 983         /*
 984          * must be outside lock due to cfg80211,
 985          * but that's not a problem.
 986          */
 987         ieee80211_send_deauth_disassoc(sdata, bssid,
 988                                        IEEE80211_STYPE_DEAUTH,
 989                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
 990                                        NULL, true);
 991 }
 992
 993 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
 994 {
 995         struct ieee80211_sub_if_data *sdata =
 996                 container_of(work, struct ieee80211_sub_if_data,
 997                              u.mgd.beacon_connection_loss_work);
 998
 999         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1000                 __ieee80211_connection_loss(sdata);
1001         else
1002                 ieee80211_mgd_probe_ap(sdata, true);
1003 }
1004
1005 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1006 {
1007         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1008         struct ieee80211_hw *hw = &sdata->local->hw;
1009
1010         trace_api_beacon_loss(sdata);
1011
1012         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1013         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1014 }
1015 EXPORT_SYMBOL(ieee80211_beacon_loss);
1016
1017 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1018 {
1019         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1020         struct ieee80211_hw *hw = &sdata->local->hw;
1021
1022         trace_api_connection_loss(sdata);
1023
1024         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1025         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1026 }
1027 EXPORT_SYMBOL(ieee80211_connection_loss);
1028
1029
1030 static enum rx_mgmt_action __must_check
1031 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1032                          struct ieee80211_mgmt *mgmt, size_t len)
1033 {
1034         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1035         const u8 *bssid = NULL;
1036         u16 reason_code;
1037
1038         if (len < 24 + 2)
1039                 return RX_MGMT_NONE;
1040
1041         ASSERT_MGD_MTX(ifmgd);
1042
1043         bssid = ifmgd->associated->bssid;
1044
1045         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1046
1047         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1048                         sdata->name, bssid, reason_code);
1049
1050         ieee80211_set_disassoc(sdata, true);
1051         ieee80211_recalc_idle(sdata->local);
1052
1053         return RX_MGMT_CFG80211_DEAUTH;
1054 }
1055
1056
1057 static enum rx_mgmt_action __must_check
1058 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1059                            struct ieee80211_mgmt *mgmt, size_t len)
1060 {
1061         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1062         u16 reason_code;
1063
1064         if (len < 24 + 2)
1065                 return RX_MGMT_NONE;
1066
1067         ASSERT_MGD_MTX(ifmgd);
1068
1069         if (WARN_ON(!ifmgd->associated))
1070                 return RX_MGMT_NONE;
1071
1072         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1073                 return RX_MGMT_NONE;
1074
1075         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1076
1077         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1078                         sdata->name, mgmt->sa, reason_code);
1079
1080         ieee80211_set_disassoc(sdata, true);
1081         ieee80211_recalc_idle(sdata->local);
1082         return RX_MGMT_CFG80211_DISASSOC;
1083 }
1084
1085
1086 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1087                                     struct ieee80211_mgmt *mgmt, size_t len)
1088 {
1089         struct ieee80211_sub_if_data *sdata = wk->sdata;
1090         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1091         struct ieee80211_local *local = sdata->local;
1092         struct ieee80211_supported_band *sband;
1093         struct sta_info *sta;
1094         struct cfg80211_bss *cbss = wk->assoc.bss;
1095         u8 *pos;
1096         u32 rates, basic_rates;
1097         u16 capab_info, aid;
1098         struct ieee802_11_elems elems;
1099         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1100         u32 changed = 0;
1101         int i, j, err;
1102         bool have_higher_than_11mbit = false;
1103         u16 ap_ht_cap_flags;
1104
1105         /* AssocResp and ReassocResp have identical structure */
1106
1107         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1108         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1109
1110         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1111                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1112                        "set\n", sdata->name, aid);
1113         aid &= ~(BIT(15) | BIT(14));
1114
1115         pos = mgmt->u.assoc_resp.variable;
1116         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1117
1118         if (!elems.supp_rates) {
1119                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1120                        sdata->name);
1121                 return false;
1122         }
1123
1124         ifmgd->aid = aid;
1125
1126         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1127         if (!sta) {
1128                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1129                        " the AP\n", sdata->name);
1130                 return false;
1131         }
1132
1133         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1134                            WLAN_STA_ASSOC_AP);
1135         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1136                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1137
1138         rates = 0;
1139         basic_rates = 0;
1140         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1141
1142         for (i = 0; i < elems.supp_rates_len; i++) {
1143                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1144                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1145
1146                 if (rate > 110)
1147                         have_higher_than_11mbit = true;
1148
1149                 for (j = 0; j < sband->n_bitrates; j++) {
1150                         if (sband->bitrates[j].bitrate == rate) {
1151                                 rates |= BIT(j);
1152                                 if (is_basic)
1153                                         basic_rates |= BIT(j);
1154                                 break;
1155                         }
1156                 }
1157         }
1158
1159         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1160                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1161                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1162
1163                 if (rate > 110)
1164                         have_higher_than_11mbit = true;
1165
1166                 for (j = 0; j < sband->n_bitrates; j++) {
1167                         if (sband->bitrates[j].bitrate == rate) {
1168                                 rates |= BIT(j);
1169                                 if (is_basic)
1170                                         basic_rates |= BIT(j);
1171                                 break;
1172                         }
1173                 }
1174         }
1175
1176         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1177         sdata->vif.bss_conf.basic_rates = basic_rates;
1178
1179         /* cf. IEEE 802.11 9.2.12 */
1180         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1181             have_higher_than_11mbit)
1182                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1183         else
1184                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1185
1186         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1187                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1188                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1189
1190         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1191
1192         rate_control_rate_init(sta);
1193
1194         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1195                 set_sta_flags(sta, WLAN_STA_MFP);
1196
1197         if (elems.wmm_param)
1198                 set_sta_flags(sta, WLAN_STA_WME);
1199
1200         err = sta_info_insert(sta);
1201         sta = NULL;
1202         if (err) {
1203                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1204                        " the AP (error %d)\n", sdata->name, err);
1205                 return false;
1206         }
1207
1208         if (elems.wmm_param)
1209                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1210                                          elems.wmm_param_len);
1211         else
1212                 ieee80211_set_wmm_default(sdata);
1213
1214         local->oper_channel = wk->chan;
1215
1216         if (elems.ht_info_elem && elems.wmm_param &&
1217             (sdata->local->hw.queues >= 4) &&
1218             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1219                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1220                                                cbss->bssid, ap_ht_cap_flags);
1221
1222         /* set AID and assoc capability,
1223          * ieee80211_set_associated() will tell the driver */
1224         bss_conf->aid = aid;
1225         bss_conf->assoc_capability = capab_info;
1226         ieee80211_set_associated(sdata, cbss, changed);
1227
1228         /*
1229          * If we're using 4-addr mode, let the AP know that we're
1230          * doing so, so that it can create the STA VLAN on its side
1231          */
1232         if (ifmgd->use_4addr)
1233                 ieee80211_send_4addr_nullfunc(local, sdata);
1234
1235         /*
1236          * Start timer to probe the connection to the AP now.
1237          * Also start the timer that will detect beacon loss.
1238          */
1239         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1240         mod_beacon_timer(sdata);
1241
1242         return true;
1243 }
1244
1245
1246 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1247                                   struct ieee80211_mgmt *mgmt,
1248                                   size_t len,
1249                                   struct ieee80211_rx_status *rx_status,
1250                                   struct ieee802_11_elems *elems,
1251                                   bool beacon)
1252 {
1253         struct ieee80211_local *local = sdata->local;
1254         int freq;
1255         struct ieee80211_bss *bss;
1256         struct ieee80211_channel *channel;
1257         bool need_ps = false;
1258
1259         if (sdata->u.mgd.associated) {
1260                 bss = (void *)sdata->u.mgd.associated->priv;
1261                 /* not previously set so we may need to recalc */
1262                 need_ps = !bss->dtim_period;
1263         }
1264
1265         if (elems->ds_params && elems->ds_params_len == 1)
1266                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1267         else
1268                 freq = rx_status->freq;
1269
1270         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1271
1272         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1273                 return;
1274
1275         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1276                                         channel, beacon);
1277         if (bss)
1278                 ieee80211_rx_bss_put(local, bss);
1279
1280         if (!sdata->u.mgd.associated)
1281                 return;
1282
1283         if (need_ps) {
1284                 mutex_lock(&local->iflist_mtx);
1285                 ieee80211_recalc_ps(local, -1);
1286                 mutex_unlock(&local->iflist_mtx);
1287         }
1288
1289         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1290             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1291                                                         ETH_ALEN) == 0)) {
1292                 struct ieee80211_channel_sw_ie *sw_elem =
1293                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1294                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1295         }
1296 }
1297
1298
1299 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1300                                          struct sk_buff *skb)
1301 {
1302         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1303         struct ieee80211_if_managed *ifmgd;
1304         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1305         size_t baselen, len = skb->len;
1306         struct ieee802_11_elems elems;
1307
1308         ifmgd = &sdata->u.mgd;
1309
1310         ASSERT_MGD_MTX(ifmgd);
1311
1312         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1313                 return; /* ignore ProbeResp to foreign address */
1314
1315         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1316         if (baselen > len)
1317                 return;
1318
1319         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1320                                 &elems);
1321
1322         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1323
1324         if (ifmgd->associated &&
1325             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1326             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1327                             IEEE80211_STA_CONNECTION_POLL)) {
1328                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1329                                   IEEE80211_STA_BEACON_POLL);
1330                 mutex_lock(&sdata->local->iflist_mtx);
1331                 ieee80211_recalc_ps(sdata->local, -1);
1332                 mutex_unlock(&sdata->local->iflist_mtx);
1333                 /*
1334                  * We've received a probe response, but are not sure whether
1335                  * we have or will be receiving any beacons or data, so let's
1336                  * schedule the timers again, just in case.
1337                  */
1338                 mod_beacon_timer(sdata);
1339                 mod_timer(&ifmgd->conn_mon_timer,
1340                           round_jiffies_up(jiffies +
1341                                            IEEE80211_CONNECTION_IDLE_TIME));
1342         }
1343 }
1344
1345 /*
1346  * This is the canonical list of information elements we care about,
1347  * the filter code also gives us all changes to the Microsoft OUI
1348  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1349  *
1350  * We implement beacon filtering in software since that means we can
1351  * avoid processing the frame here and in cfg80211, and userspace
1352  * will not be able to tell whether the hardware supports it or not.
1353  *
1354  * XXX: This list needs to be dynamic -- userspace needs to be able to
1355  *      add items it requires. It also needs to be able to tell us to
1356  *      look out for other vendor IEs.
1357  */
1358 static const u64 care_about_ies =
1359         (1ULL << WLAN_EID_COUNTRY) |
1360         (1ULL << WLAN_EID_ERP_INFO) |
1361         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1362         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1363         (1ULL << WLAN_EID_HT_CAPABILITY) |
1364         (1ULL << WLAN_EID_HT_INFORMATION);
1365
1366 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1367                                      struct ieee80211_mgmt *mgmt,
1368                                      size_t len,
1369                                      struct ieee80211_rx_status *rx_status)
1370 {
1371         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1372         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1373         size_t baselen;
1374         struct ieee802_11_elems elems;
1375         struct ieee80211_local *local = sdata->local;
1376         u32 changed = 0;
1377         bool erp_valid, directed_tim = false;
1378         u8 erp_value = 0;
1379         u32 ncrc;
1380         u8 *bssid;
1381
1382         ASSERT_MGD_MTX(ifmgd);
1383
1384         /* Process beacon from the current BSS */
1385         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1386         if (baselen > len)
1387                 return;
1388
1389         if (rx_status->freq != local->hw.conf.channel->center_freq)
1390                 return;
1391
1392         /*
1393          * We might have received a number of frames, among them a
1394          * disassoc frame and a beacon...
1395          */
1396         if (!ifmgd->associated)
1397                 return;
1398
1399         bssid = ifmgd->associated->bssid;
1400
1401         /*
1402          * And in theory even frames from a different AP we were just
1403          * associated to a split-second ago!
1404          */
1405         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1406                 return;
1407
1408         /* Track average RSSI from the Beacon frames of the current AP */
1409         ifmgd->last_beacon_signal = rx_status->signal;
1410         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1411                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1412                 ifmgd->ave_beacon_signal = rx_status->signal;
1413                 ifmgd->last_cqm_event_signal = 0;
1414         } else {
1415                 ifmgd->ave_beacon_signal =
1416                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1417                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1418                          ifmgd->ave_beacon_signal) / 16;
1419         }
1420         if (bss_conf->cqm_rssi_thold &&
1421             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1422                 int sig = ifmgd->ave_beacon_signal / 16;
1423                 int last_event = ifmgd->last_cqm_event_signal;
1424                 int thold = bss_conf->cqm_rssi_thold;
1425                 int hyst = bss_conf->cqm_rssi_hyst;
1426                 if (sig < thold &&
1427                     (last_event == 0 || sig < last_event - hyst)) {
1428                         ifmgd->last_cqm_event_signal = sig;
1429                         ieee80211_cqm_rssi_notify(
1430                                 &sdata->vif,
1431                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1432                                 GFP_KERNEL);
1433                 } else if (sig > thold &&
1434                            (last_event == 0 || sig > last_event + hyst)) {
1435                         ifmgd->last_cqm_event_signal = sig;
1436                         ieee80211_cqm_rssi_notify(
1437                                 &sdata->vif,
1438                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1439                                 GFP_KERNEL);
1440                 }
1441         }
1442
1443         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1444 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1445                 if (net_ratelimit()) {
1446                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1447                                "to a received beacon\n", sdata->name);
1448                 }
1449 #endif
1450                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1451                 mutex_lock(&local->iflist_mtx);
1452                 ieee80211_recalc_ps(local, -1);
1453                 mutex_unlock(&local->iflist_mtx);
1454         }
1455
1456         /*
1457          * Push the beacon loss detection into the future since
1458          * we are processing a beacon from the AP just now.
1459          */
1460         mod_beacon_timer(sdata);
1461
1462         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1463         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1464                                           len - baselen, &elems,
1465                                           care_about_ies, ncrc);
1466
1467         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1468                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1469                                                    ifmgd->aid);
1470
1471         if (ncrc != ifmgd->beacon_crc) {
1472                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1473                                       true);
1474
1475                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1476                                          elems.wmm_param_len);
1477         }
1478
1479         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1480                 if (directed_tim) {
1481                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1482                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1483                                 ieee80211_hw_config(local,
1484                                                     IEEE80211_CONF_CHANGE_PS);
1485                                 ieee80211_send_nullfunc(local, sdata, 0);
1486                         } else {
1487                                 local->pspolling = true;
1488
1489                                 /*
1490                                  * Here is assumed that the driver will be
1491                                  * able to send ps-poll frame and receive a
1492                                  * response even though power save mode is
1493                                  * enabled, but some drivers might require
1494                                  * to disable power save here. This needs
1495                                  * to be investigated.
1496                                  */
1497                                 ieee80211_send_pspoll(local, sdata);
1498                         }
1499                 }
1500         }
1501
1502         if (ncrc == ifmgd->beacon_crc)
1503                 return;
1504         ifmgd->beacon_crc = ncrc;
1505
1506         if (elems.erp_info && elems.erp_info_len >= 1) {
1507                 erp_valid = true;
1508                 erp_value = elems.erp_info[0];
1509         } else {
1510                 erp_valid = false;
1511         }
1512         changed |= ieee80211_handle_bss_capability(sdata,
1513                         le16_to_cpu(mgmt->u.beacon.capab_info),
1514                         erp_valid, erp_value);
1515
1516
1517         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1518             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1519                 struct sta_info *sta;
1520                 struct ieee80211_supported_band *sband;
1521                 u16 ap_ht_cap_flags;
1522
1523                 rcu_read_lock();
1524
1525                 sta = sta_info_get(sdata, bssid);
1526                 if (WARN_ON(!sta)) {
1527                         rcu_read_unlock();
1528                         return;
1529                 }
1530
1531                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1532
1533                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1534                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1535
1536                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1537
1538                 rcu_read_unlock();
1539
1540                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1541                                                bssid, ap_ht_cap_flags);
1542         }
1543
1544         /* Note: country IE parsing is done for us by cfg80211 */
1545         if (elems.country_elem) {
1546                 /* TODO: IBSS also needs this */
1547                 if (elems.pwr_constr_elem)
1548                         ieee80211_handle_pwr_constr(sdata,
1549                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1550                                 elems.pwr_constr_elem,
1551                                 elems.pwr_constr_elem_len);
1552         }
1553
1554         ieee80211_bss_info_change_notify(sdata, changed);
1555 }
1556
1557 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1558                                           struct sk_buff *skb)
1559 {
1560         struct ieee80211_local *local = sdata->local;
1561         struct ieee80211_mgmt *mgmt;
1562         u16 fc;
1563
1564         if (skb->len < 24)
1565                 return RX_DROP_MONITOR;
1566
1567         mgmt = (struct ieee80211_mgmt *) skb->data;
1568         fc = le16_to_cpu(mgmt->frame_control);
1569
1570         switch (fc & IEEE80211_FCTL_STYPE) {
1571         case IEEE80211_STYPE_PROBE_RESP:
1572         case IEEE80211_STYPE_BEACON:
1573         case IEEE80211_STYPE_DEAUTH:
1574         case IEEE80211_STYPE_DISASSOC:
1575         case IEEE80211_STYPE_ACTION:
1576                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1577                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1578                 return RX_QUEUED;
1579         }
1580
1581         return RX_DROP_MONITOR;
1582 }
1583
1584 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1585                                          struct sk_buff *skb)
1586 {
1587         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1588         struct ieee80211_rx_status *rx_status;
1589         struct ieee80211_mgmt *mgmt;
1590         enum rx_mgmt_action rma = RX_MGMT_NONE;
1591         u16 fc;
1592
1593         rx_status = (struct ieee80211_rx_status *) skb->cb;
1594         mgmt = (struct ieee80211_mgmt *) skb->data;
1595         fc = le16_to_cpu(mgmt->frame_control);
1596
1597         mutex_lock(&ifmgd->mtx);
1598
1599         if (ifmgd->associated &&
1600             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1601                 switch (fc & IEEE80211_FCTL_STYPE) {
1602                 case IEEE80211_STYPE_BEACON:
1603                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1604                                                  rx_status);
1605                         break;
1606                 case IEEE80211_STYPE_PROBE_RESP:
1607                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1608                         break;
1609                 case IEEE80211_STYPE_DEAUTH:
1610                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1611                         break;
1612                 case IEEE80211_STYPE_DISASSOC:
1613                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1614                         break;
1615                 case IEEE80211_STYPE_ACTION:
1616                         if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1617                                 break;
1618
1619                         ieee80211_sta_process_chanswitch(sdata,
1620                                         &mgmt->u.action.u.chan_switch.sw_elem,
1621                                         (void *)ifmgd->associated->priv);
1622                         break;
1623                 }
1624                 mutex_unlock(&ifmgd->mtx);
1625
1626                 switch (rma) {
1627                 case RX_MGMT_NONE:
1628                         /* no action */
1629                         break;
1630                 case RX_MGMT_CFG80211_DEAUTH:
1631                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1632                         break;
1633                 case RX_MGMT_CFG80211_DISASSOC:
1634                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1635                         break;
1636                 default:
1637                         WARN(1, "unexpected: %d", rma);
1638                 }
1639                 goto out;
1640         }
1641
1642         mutex_unlock(&ifmgd->mtx);
1643
1644         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1645             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1646                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1647
1648  out:
1649         kfree_skb(skb);
1650 }
1651
1652 static void ieee80211_sta_timer(unsigned long data)
1653 {
1654         struct ieee80211_sub_if_data *sdata =
1655                 (struct ieee80211_sub_if_data *) data;
1656         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1657         struct ieee80211_local *local = sdata->local;
1658
1659         if (local->quiescing) {
1660                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1661                 return;
1662         }
1663
1664         ieee80211_queue_work(&local->hw, &ifmgd->work);
1665 }
1666
1667 static void ieee80211_sta_work(struct work_struct *work)
1668 {
1669         struct ieee80211_sub_if_data *sdata =
1670                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1671         struct ieee80211_local *local = sdata->local;
1672         struct ieee80211_if_managed *ifmgd;
1673         struct sk_buff *skb;
1674
1675         if (!ieee80211_sdata_running(sdata))
1676                 return;
1677
1678         if (local->scanning)
1679                 return;
1680
1681         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1682                 return;
1683
1684         /*
1685          * ieee80211_queue_work() should have picked up most cases,
1686          * here we'll pick the the rest.
1687          */
1688         if (WARN(local->suspended, "STA MLME work scheduled while "
1689                  "going to suspend\n"))
1690                 return;
1691
1692         ifmgd = &sdata->u.mgd;
1693
1694         /* first process frames to avoid timing out while a frame is pending */
1695         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1696                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1697
1698         /* then process the rest of the work */
1699         mutex_lock(&ifmgd->mtx);
1700
1701         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1702                             IEEE80211_STA_CONNECTION_POLL) &&
1703             ifmgd->associated) {
1704                 u8 bssid[ETH_ALEN];
1705
1706                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1707                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1708                         run_again(ifmgd, ifmgd->probe_timeout);
1709
1710                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1711 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1712                         printk(KERN_DEBUG "No probe response from AP %pM"
1713                                 " after %dms, try %d\n", bssid,
1714                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1715                                 ifmgd->probe_send_count);
1716 #endif
1717                         ieee80211_mgd_probe_ap_send(sdata);
1718                 } else {
1719                         /*
1720                          * We actually lost the connection ... or did we?
1721                          * Let's make sure!
1722                          */
1723                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1724                                           IEEE80211_STA_BEACON_POLL);
1725                         printk(KERN_DEBUG "No probe response from AP %pM"
1726                                 " after %dms, disconnecting.\n",
1727                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1728                         ieee80211_set_disassoc(sdata, true);
1729                         ieee80211_recalc_idle(local);
1730                         mutex_unlock(&ifmgd->mtx);
1731                         /*
1732                          * must be outside lock due to cfg80211,
1733                          * but that's not a problem.
1734                          */
1735                         ieee80211_send_deauth_disassoc(sdata, bssid,
1736                                         IEEE80211_STYPE_DEAUTH,
1737                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1738                                         NULL, true);
1739                         mutex_lock(&ifmgd->mtx);
1740                 }
1741         }
1742
1743         mutex_unlock(&ifmgd->mtx);
1744 }
1745
1746 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1747 {
1748         struct ieee80211_sub_if_data *sdata =
1749                 (struct ieee80211_sub_if_data *) data;
1750         struct ieee80211_local *local = sdata->local;
1751
1752         if (local->quiescing)
1753                 return;
1754
1755         ieee80211_queue_work(&sdata->local->hw,
1756                              &sdata->u.mgd.beacon_connection_loss_work);
1757 }
1758
1759 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1760 {
1761         struct ieee80211_sub_if_data *sdata =
1762                 (struct ieee80211_sub_if_data *) data;
1763         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1764         struct ieee80211_local *local = sdata->local;
1765
1766         if (local->quiescing)
1767                 return;
1768
1769         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1770 }
1771
1772 static void ieee80211_sta_monitor_work(struct work_struct *work)
1773 {
1774         struct ieee80211_sub_if_data *sdata =
1775                 container_of(work, struct ieee80211_sub_if_data,
1776                              u.mgd.monitor_work);
1777
1778         ieee80211_mgd_probe_ap(sdata, false);
1779 }
1780
1781 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1782 {
1783         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1784                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1785                                         IEEE80211_STA_CONNECTION_POLL);
1786
1787                 /* let's probe the connection once */
1788                 ieee80211_queue_work(&sdata->local->hw,
1789                            &sdata->u.mgd.monitor_work);
1790                 /* and do all the other regular work too */
1791                 ieee80211_queue_work(&sdata->local->hw,
1792                            &sdata->u.mgd.work);
1793         }
1794 }
1795
1796 #ifdef CONFIG_PM
1797 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1798 {
1799         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1800
1801         /*
1802          * we need to use atomic bitops for the running bits
1803          * only because both timers might fire at the same
1804          * time -- the code here is properly synchronised.
1805          */
1806
1807         cancel_work_sync(&ifmgd->work);
1808         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1809         if (del_timer_sync(&ifmgd->timer))
1810                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1811
1812         cancel_work_sync(&ifmgd->chswitch_work);
1813         if (del_timer_sync(&ifmgd->chswitch_timer))
1814                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1815
1816         cancel_work_sync(&ifmgd->monitor_work);
1817         /* these will just be re-established on connection */
1818         del_timer_sync(&ifmgd->conn_mon_timer);
1819         del_timer_sync(&ifmgd->bcn_mon_timer);
1820 }
1821
1822 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1823 {
1824         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1825
1826         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1827                 add_timer(&ifmgd->timer);
1828         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1829                 add_timer(&ifmgd->chswitch_timer);
1830 }
1831 #endif
1832
1833 /* interface setup */
1834 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1835 {
1836         struct ieee80211_if_managed *ifmgd;
1837
1838         ifmgd = &sdata->u.mgd;
1839         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1840         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1841         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1842         INIT_WORK(&ifmgd->beacon_connection_loss_work,
1843                   ieee80211_beacon_connection_loss_work);
1844         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1845                     (unsigned long) sdata);
1846         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1847                     (unsigned long) sdata);
1848         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1849                     (unsigned long) sdata);
1850         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1851                     (unsigned long) sdata);
1852         skb_queue_head_init(&ifmgd->skb_queue);
1853
1854         ifmgd->flags = 0;
1855
1856         mutex_init(&ifmgd->mtx);
1857
1858         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1859                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1860         else
1861                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1862 }
1863
1864 /* scan finished notification */
1865 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1866 {
1867         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1868
1869         /* Restart STA timers */
1870         rcu_read_lock();
1871         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1872                 ieee80211_restart_sta_timer(sdata);
1873         rcu_read_unlock();
1874 }
1875
1876 int ieee80211_max_network_latency(struct notifier_block *nb,
1877                                   unsigned long data, void *dummy)
1878 {
1879         s32 latency_usec = (s32) data;
1880         struct ieee80211_local *local =
1881                 container_of(nb, struct ieee80211_local,
1882                              network_latency_notifier);
1883
1884         mutex_lock(&local->iflist_mtx);
1885         ieee80211_recalc_ps(local, latency_usec);
1886         mutex_unlock(&local->iflist_mtx);
1887
1888         return 0;
1889 }
1890
1891 /* config hooks */
1892 static enum work_done_result
1893 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1894                           struct sk_buff *skb)
1895 {
1896         if (!skb) {
1897                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1898                 return WORK_DONE_DESTROY;
1899         }
1900
1901         if (wk->type == IEEE80211_WORK_AUTH) {
1902                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1903                 return WORK_DONE_DESTROY;
1904         }
1905
1906         mutex_lock(&wk->sdata->u.mgd.mtx);
1907         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1908         mutex_unlock(&wk->sdata->u.mgd.mtx);
1909
1910         wk->type = IEEE80211_WORK_AUTH;
1911         wk->probe_auth.tries = 0;
1912         return WORK_DONE_REQUEUE;
1913 }
1914
1915 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1916                        struct cfg80211_auth_request *req)
1917 {
1918         const u8 *ssid;
1919         struct ieee80211_work *wk;
1920         u16 auth_alg;
1921
1922         if (req->local_state_change)
1923                 return 0; /* no need to update mac80211 state */
1924
1925         switch (req->auth_type) {
1926         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1927                 auth_alg = WLAN_AUTH_OPEN;
1928                 break;
1929         case NL80211_AUTHTYPE_SHARED_KEY:
1930                 auth_alg = WLAN_AUTH_SHARED_KEY;
1931                 break;
1932         case NL80211_AUTHTYPE_FT:
1933                 auth_alg = WLAN_AUTH_FT;
1934                 break;
1935         case NL80211_AUTHTYPE_NETWORK_EAP:
1936                 auth_alg = WLAN_AUTH_LEAP;
1937                 break;
1938         default:
1939                 return -EOPNOTSUPP;
1940         }
1941
1942         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1943         if (!wk)
1944                 return -ENOMEM;
1945
1946         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1947
1948         if (req->ie && req->ie_len) {
1949                 memcpy(wk->ie, req->ie, req->ie_len);
1950                 wk->ie_len = req->ie_len;
1951         }
1952
1953         if (req->key && req->key_len) {
1954                 wk->probe_auth.key_len = req->key_len;
1955                 wk->probe_auth.key_idx = req->key_idx;
1956                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1957         }
1958
1959         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1960         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1961         wk->probe_auth.ssid_len = ssid[1];
1962
1963         wk->probe_auth.algorithm = auth_alg;
1964         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1965
1966         /* if we already have a probe, don't probe again */
1967         if (req->bss->proberesp_ies)
1968                 wk->type = IEEE80211_WORK_AUTH;
1969         else
1970                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1971         wk->chan = req->bss->channel;
1972         wk->sdata = sdata;
1973         wk->done = ieee80211_probe_auth_done;
1974
1975         ieee80211_add_work(wk);
1976         return 0;
1977 }
1978
1979 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1980                                                   struct sk_buff *skb)
1981 {
1982         struct ieee80211_mgmt *mgmt;
1983         u16 status;
1984
1985         if (!skb) {
1986                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1987                 return WORK_DONE_DESTROY;
1988         }
1989
1990         mgmt = (void *)skb->data;
1991         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1992
1993         if (status == WLAN_STATUS_SUCCESS) {
1994                 mutex_lock(&wk->sdata->u.mgd.mtx);
1995                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1996                         mutex_unlock(&wk->sdata->u.mgd.mtx);
1997                         /* oops -- internal error -- send timeout for now */
1998                         cfg80211_send_assoc_timeout(wk->sdata->dev,
1999                                                     wk->filter_ta);
2000                         return WORK_DONE_DESTROY;
2001                 }
2002                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2003         }
2004
2005         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2006         return WORK_DONE_DESTROY;
2007 }
2008
2009 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2010                         struct cfg80211_assoc_request *req)
2011 {
2012         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2013         struct ieee80211_bss *bss = (void *)req->bss->priv;
2014         struct ieee80211_work *wk;
2015         const u8 *ssid;
2016         int i;
2017
2018         mutex_lock(&ifmgd->mtx);
2019         if (ifmgd->associated) {
2020                 if (!req->prev_bssid ||
2021                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2022                            ETH_ALEN)) {
2023                         /*
2024                          * We are already associated and the request was not a
2025                          * reassociation request from the current BSS, so
2026                          * reject it.
2027                          */
2028                         mutex_unlock(&ifmgd->mtx);
2029                         return -EALREADY;
2030                 }
2031
2032                 /* Trying to reassociate - clear previous association state */
2033                 ieee80211_set_disassoc(sdata, true);
2034         }
2035         mutex_unlock(&ifmgd->mtx);
2036
2037         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2038         if (!wk)
2039                 return -ENOMEM;
2040
2041         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2042         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2043
2044         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2045                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2046                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2047                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2048                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2049
2050
2051         if (req->ie && req->ie_len) {
2052                 memcpy(wk->ie, req->ie, req->ie_len);
2053                 wk->ie_len = req->ie_len;
2054         } else
2055                 wk->ie_len = 0;
2056
2057         wk->assoc.bss = req->bss;
2058
2059         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2060
2061         /* new association always uses requested smps mode */
2062         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2063                 if (ifmgd->powersave)
2064                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2065                 else
2066                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2067         } else
2068                 ifmgd->ap_smps = ifmgd->req_smps;
2069
2070         wk->assoc.smps = ifmgd->ap_smps;
2071         /*
2072          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2073          * We still associate in non-HT mode (11a/b/g) if any one of these
2074          * ciphers is configured as pairwise.
2075          * We can set this to true for non-11n hardware, that'll be checked
2076          * separately along with the peer capabilities.
2077          */
2078         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2079         wk->assoc.capability = req->bss->capability;
2080         wk->assoc.wmm_used = bss->wmm_used;
2081         wk->assoc.supp_rates = bss->supp_rates;
2082         wk->assoc.supp_rates_len = bss->supp_rates_len;
2083         wk->assoc.ht_information_ie =
2084                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2085
2086         if (bss->wmm_used && bss->uapsd_supported &&
2087             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2088                 wk->assoc.uapsd_used = true;
2089                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2090         } else {
2091                 wk->assoc.uapsd_used = false;
2092                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2093         }
2094
2095         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2096         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2097         wk->assoc.ssid_len = ssid[1];
2098
2099         if (req->prev_bssid)
2100                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2101
2102         wk->type = IEEE80211_WORK_ASSOC;
2103         wk->chan = req->bss->channel;
2104         wk->sdata = sdata;
2105         wk->done = ieee80211_assoc_done;
2106
2107         if (req->use_mfp) {
2108                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2109                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2110         } else {
2111                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2112                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2113         }
2114
2115         if (req->crypto.control_port)
2116                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2117         else
2118                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2119
2120         ieee80211_add_work(wk);
2121         return 0;
2122 }
2123
2124 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2125                          struct cfg80211_deauth_request *req,
2126                          void *cookie)
2127 {
2128         struct ieee80211_local *local = sdata->local;
2129         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2130         struct ieee80211_work *wk;
2131         const u8 *bssid = req->bss->bssid;
2132
2133         mutex_lock(&ifmgd->mtx);
2134
2135         if (ifmgd->associated == req->bss) {
2136                 bssid = req->bss->bssid;
2137                 ieee80211_set_disassoc(sdata, true);
2138                 mutex_unlock(&ifmgd->mtx);
2139         } else {
2140                 bool not_auth_yet = false;
2141
2142                 mutex_unlock(&ifmgd->mtx);
2143
2144                 mutex_lock(&local->work_mtx);
2145                 list_for_each_entry(wk, &local->work_list, list) {
2146                         if (wk->sdata != sdata)
2147                                 continue;
2148
2149                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2150                             wk->type != IEEE80211_WORK_AUTH)
2151                                 continue;
2152
2153                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2154                                 continue;
2155
2156                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2157                         list_del_rcu(&wk->list);
2158                         free_work(wk);
2159                         break;
2160                 }
2161                 mutex_unlock(&local->work_mtx);
2162
2163                 /*
2164                  * If somebody requests authentication and we haven't
2165                  * sent out an auth frame yet there's no need to send
2166                  * out a deauth frame either. If the state was PROBE,
2167                  * then this is the case. If it's AUTH we have sent a
2168                  * frame, and if it's IDLE we have completed the auth
2169                  * process already.
2170                  */
2171                 if (not_auth_yet) {
2172                         __cfg80211_auth_canceled(sdata->dev, bssid);
2173                         return 0;
2174                 }
2175         }
2176
2177         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2178                sdata->name, bssid, req->reason_code);
2179
2180         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2181                                        req->reason_code, cookie,
2182                                        !req->local_state_change);
2183
2184         ieee80211_recalc_idle(sdata->local);
2185
2186         return 0;
2187 }
2188
2189 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2190                            struct cfg80211_disassoc_request *req,
2191                            void *cookie)
2192 {
2193         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2194         u8 bssid[ETH_ALEN];
2195
2196         mutex_lock(&ifmgd->mtx);
2197
2198         /*
2199          * cfg80211 should catch this ... but it's racy since
2200          * we can receive a disassoc frame, process it, hand it
2201          * to cfg80211 while that's in a locked section already
2202          * trying to tell us that the user wants to disconnect.
2203          */
2204         if (ifmgd->associated != req->bss) {
2205                 mutex_unlock(&ifmgd->mtx);
2206                 return -ENOLINK;
2207         }
2208
2209         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2210                sdata->name, req->bss->bssid, req->reason_code);
2211
2212         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2213         ieee80211_set_disassoc(sdata, false);
2214
2215         mutex_unlock(&ifmgd->mtx);
2216
2217         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2218                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2219                         cookie, !req->local_state_change);
2220         sta_info_destroy_addr(sdata, bssid);
2221
2222         ieee80211_recalc_idle(sdata->local);
2223
2224         return 0;
2225 }
2226
2227 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2228                          struct ieee80211_channel *chan,
2229                          enum nl80211_channel_type channel_type,
2230                          const u8 *buf, size_t len, u64 *cookie)
2231 {
2232         struct ieee80211_local *local = sdata->local;
2233         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2234         struct sk_buff *skb;
2235
2236         /* Check that we are on the requested channel for transmission */
2237         if ((chan != local->tmp_channel ||
2238              channel_type != local->tmp_channel_type) &&
2239             (chan != local->oper_channel ||
2240              channel_type != local->oper_channel_type))
2241                 return -EBUSY;
2242
2243         skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2244         if (!skb)
2245                 return -ENOMEM;
2246         skb_reserve(skb, local->hw.extra_tx_headroom);
2247
2248         memcpy(skb_put(skb, len), buf, len);
2249
2250         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2251                 IEEE80211_SKB_CB(skb)->flags |=
2252                         IEEE80211_TX_INTFL_DONT_ENCRYPT;
2253         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2254                 IEEE80211_TX_CTL_REQ_TX_STATUS;
2255         skb->dev = sdata->dev;
2256         ieee80211_tx_skb(sdata, skb);
2257
2258         *cookie = (unsigned long) skb;
2259         return 0;
2260 }
2261
2262 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2263                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2264                                gfp_t gfp)
2265 {
2266         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2267
2268         trace_api_cqm_rssi_notify(sdata, rssi_event);
2269
2270         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2271 }
2272 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);