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