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_AUTH_TIMEOUT (HZ / 5)
  31 #define IEEE80211_AUTH_MAX_TRIES 3
  32 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  33 #define IEEE80211_ASSOC_MAX_TRIES 3
  34 #define IEEE80211_MAX_PROBE_TRIES 5
  35
  36 /*
  37  * beacon loss detection timeout
  38  * XXX: should depend on beacon interval
  39  */
  40 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
  41 /*
  42  * Time the connection can be idle before we probe
  43  * it to see if we can still talk to the AP.
  44  */
  45 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  46 /*
  47  * Time we wait for a probe response after sending
  48  * a probe request because of beacon loss or for
  49  * checking the connection still works.
  50  */
  51 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  52
  53 #define TMR_RUNNING_TIMER       0
  54 #define TMR_RUNNING_CHANSW      1
  55
  56 /*
  57  * All cfg80211 functions have to be called outside a locked
  58  * section so that they can acquire a lock themselves... This
  59  * is much simpler than queuing up things in cfg80211, but we
  60  * do need some indirection for that here.
  61  */
  62 enum rx_mgmt_action {
  63         /* no action required */
  64         RX_MGMT_NONE,
  65
  66         /* caller must call cfg80211_send_rx_auth() */
  67         RX_MGMT_CFG80211_AUTH,
  68
  69         /* caller must call cfg80211_send_rx_assoc() */
  70         RX_MGMT_CFG80211_ASSOC,
  71
  72         /* caller must call cfg80211_send_deauth() */
  73         RX_MGMT_CFG80211_DEAUTH,
  74
  75         /* caller must call cfg80211_send_disassoc() */
  76         RX_MGMT_CFG80211_DISASSOC,
  77
  78         /* caller must tell cfg80211 about internal error */
  79         RX_MGMT_CFG80211_ASSOC_ERROR,
  80 };
  81
  82 /* utils */
  83 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  84 {
  85         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  86 }
  87
  88 /*
  89  * We can have multiple work items (and connection probing)
  90  * scheduling this timer, but we need to take care to only
  91  * reschedule it when it should fire _earlier_ than it was
  92  * asked for before, or if it's not pending right now. This
  93  * function ensures that. Note that it then is required to
  94  * run this function for all timeouts after the first one
  95  * has happened -- the work that runs from this timer will
  96  * do that.
  97  */
  98 static void run_again(struct ieee80211_if_managed *ifmgd,
  99                              unsigned long timeout)
 100 {
 101         ASSERT_MGD_MTX(ifmgd);
 102
 103         if (!timer_pending(&ifmgd->timer) ||
 104             time_before(timeout, ifmgd->timer.expires))
 105                 mod_timer(&ifmgd->timer, timeout);
 106 }
 107
 108 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 109 {
 110         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 111                 return;
 112
 113         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 114                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 115 }
 116
 117 static int ecw2cw(int ecw)
 118 {
 119         return (1 << ecw) - 1;
 120 }
 121
 122 /*
 123  * ieee80211_enable_ht should be called only after the operating band
 124  * has been determined as ht configuration depends on the hw's
 125  * HT abilities for a specific band.
 126  */
 127 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 128                                struct ieee80211_ht_info *hti,
 129                                const u8 *bssid, u16 ap_ht_cap_flags)
 130 {
 131         struct ieee80211_local *local = sdata->local;
 132         struct ieee80211_supported_band *sband;
 133         struct sta_info *sta;
 134         u32 changed = 0;
 135         u16 ht_opmode;
 136         bool enable_ht = true, ht_changed;
 137         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 138
 139         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 140
 141         /* HT is not supported */
 142         if (!sband->ht_cap.ht_supported)
 143                 enable_ht = false;
 144
 145         /* check that channel matches the right operating channel */
 146         if (local->hw.conf.channel->center_freq !=
 147             ieee80211_channel_to_frequency(hti->control_chan))
 148                 enable_ht = false;
 149
 150         if (enable_ht) {
 151                 channel_type = NL80211_CHAN_HT20;
 152
 153                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 154                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 155                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 156                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 157                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 158                                 if (!(local->hw.conf.channel->flags &
 159                                     IEEE80211_CHAN_NO_HT40PLUS))
 160                                         channel_type = NL80211_CHAN_HT40PLUS;
 161                                 break;
 162                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 163                                 if (!(local->hw.conf.channel->flags &
 164                                     IEEE80211_CHAN_NO_HT40MINUS))
 165                                         channel_type = NL80211_CHAN_HT40MINUS;
 166                                 break;
 167                         }
 168                 }
 169         }
 170
 171         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 172                      channel_type != local->hw.conf.channel_type;
 173
 174         local->oper_channel_type = channel_type;
 175
 176         if (ht_changed) {
 177                 /* channel_type change automatically detected */
 178                 ieee80211_hw_config(local, 0);
 179
 180                 rcu_read_lock();
 181                 sta = sta_info_get(sdata, bssid);
 182                 if (sta)
 183                         rate_control_rate_update(local, sband, sta,
 184                                                  IEEE80211_RC_HT_CHANGED);
 185                 rcu_read_unlock();
 186         }
 187
 188         /* disable HT */
 189         if (!enable_ht)
 190                 return 0;
 191
 192         ht_opmode = le16_to_cpu(hti->operation_mode);
 193
 194         /* if bss configuration changed store the new one */
 195         if (!sdata->ht_opmode_valid ||
 196             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 197                 changed |= BSS_CHANGED_HT;
 198                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 199                 sdata->ht_opmode_valid = true;
 200         }
 201
 202         return changed;
 203 }
 204
 205 /* frame sending functions */
 206
 207 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 208                                            const u8 *bssid, u16 stype, u16 reason,
 209                                            void *cookie)
 210 {
 211         struct ieee80211_local *local = sdata->local;
 212         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 213         struct sk_buff *skb;
 214         struct ieee80211_mgmt *mgmt;
 215
 216         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 217         if (!skb) {
 218                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 219                        "deauth/disassoc frame\n", sdata->name);
 220                 return;
 221         }
 222         skb_reserve(skb, local->hw.extra_tx_headroom);
 223
 224         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 225         memset(mgmt, 0, 24);
 226         memcpy(mgmt->da, bssid, ETH_ALEN);
 227         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 228         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 229         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 230         skb_put(skb, 2);
 231         /* u.deauth.reason_code == u.disassoc.reason_code */
 232         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 233
 234         if (stype == IEEE80211_STYPE_DEAUTH)
 235                 if (cookie)
 236                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 237                 else
 238                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 239         else
 240                 if (cookie)
 241                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 242                 else
 243                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 244         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 245                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 246         ieee80211_tx_skb(sdata, skb);
 247 }
 248
 249 void ieee80211_send_pspoll(struct ieee80211_local *local,
 250                            struct ieee80211_sub_if_data *sdata)
 251 {
 252         struct ieee80211_pspoll *pspoll;
 253         struct sk_buff *skb;
 254
 255         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 256         if (!skb)
 257                 return;
 258
 259         pspoll = (struct ieee80211_pspoll *) skb->data;
 260         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 261
 262         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 263         ieee80211_tx_skb(sdata, skb);
 264 }
 265
 266 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 267                              struct ieee80211_sub_if_data *sdata,
 268                              int powersave)
 269 {
 270         struct sk_buff *skb;
 271         struct ieee80211_hdr_3addr *nullfunc;
 272
 273         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 274         if (!skb)
 275                 return;
 276
 277         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 278         if (powersave)
 279                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 280
 281         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 282         ieee80211_tx_skb(sdata, skb);
 283 }
 284
 285 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 286                                           struct ieee80211_sub_if_data *sdata)
 287 {
 288         struct sk_buff *skb;
 289         struct ieee80211_hdr *nullfunc;
 290         __le16 fc;
 291
 292         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 293                 return;
 294
 295         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 296         if (!skb) {
 297                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 298                        "nullfunc frame\n", sdata->name);
 299                 return;
 300         }
 301         skb_reserve(skb, local->hw.extra_tx_headroom);
 302
 303         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 304         memset(nullfunc, 0, 30);
 305         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 306                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 307         nullfunc->frame_control = fc;
 308         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 309         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 310         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 311         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 312
 313         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 314         ieee80211_tx_skb(sdata, skb);
 315 }
 316
 317 /* spectrum management related things */
 318 static void ieee80211_chswitch_work(struct work_struct *work)
 319 {
 320         struct ieee80211_sub_if_data *sdata =
 321                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 322         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 323
 324         if (!ieee80211_sdata_running(sdata))
 325                 return;
 326
 327         mutex_lock(&ifmgd->mtx);
 328         if (!ifmgd->associated)
 329                 goto out;
 330
 331         sdata->local->oper_channel = sdata->local->csa_channel;
 332         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
 333
 334         /* XXX: shouldn't really modify cfg80211-owned data! */
 335         ifmgd->associated->channel = sdata->local->oper_channel;
 336
 337         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 338                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 339  out:
 340         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 341         mutex_unlock(&ifmgd->mtx);
 342 }
 343
 344 static void ieee80211_chswitch_timer(unsigned long data)
 345 {
 346         struct ieee80211_sub_if_data *sdata =
 347                 (struct ieee80211_sub_if_data *) data;
 348         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 349
 350         if (sdata->local->quiescing) {
 351                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 352                 return;
 353         }
 354
 355         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 356 }
 357
 358 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 359                                       struct ieee80211_channel_sw_ie *sw_elem,
 360                                       struct ieee80211_bss *bss)
 361 {
 362         struct cfg80211_bss *cbss =
 363                 container_of((void *)bss, struct cfg80211_bss, priv);
 364         struct ieee80211_channel *new_ch;
 365         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 366         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 367
 368         ASSERT_MGD_MTX(ifmgd);
 369
 370         if (!ifmgd->associated)
 371                 return;
 372
 373         if (sdata->local->scanning)
 374                 return;
 375
 376         /* Disregard subsequent beacons if we are already running a timer
 377            processing a CSA */
 378
 379         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 380                 return;
 381
 382         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 383         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 384                 return;
 385
 386         sdata->local->csa_channel = new_ch;
 387
 388         if (sw_elem->count <= 1) {
 389                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 390         } else {
 391                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 392                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 393                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 394                 mod_timer(&ifmgd->chswitch_timer,
 395                           jiffies +
 396                           msecs_to_jiffies(sw_elem->count *
 397                                            cbss->beacon_interval));
 398         }
 399 }
 400
 401 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 402                                         u16 capab_info, u8 *pwr_constr_elem,
 403                                         u8 pwr_constr_elem_len)
 404 {
 405         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 406
 407         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 408                 return;
 409
 410         /* Power constraint IE length should be 1 octet */
 411         if (pwr_constr_elem_len != 1)
 412                 return;
 413
 414         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 415             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 416                 sdata->local->power_constr_level = *pwr_constr_elem;
 417                 ieee80211_hw_config(sdata->local, 0);
 418         }
 419 }
 420
 421 /* powersave */
 422 static void ieee80211_enable_ps(struct ieee80211_local *local,
 423                                 struct ieee80211_sub_if_data *sdata)
 424 {
 425         struct ieee80211_conf *conf = &local->hw.conf;
 426
 427         /*
 428          * If we are scanning right now then the parameters will
 429          * take effect when scan finishes.
 430          */
 431         if (local->scanning)
 432                 return;
 433
 434         if (conf->dynamic_ps_timeout > 0 &&
 435             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 436                 mod_timer(&local->dynamic_ps_timer, jiffies +
 437                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 438         } else {
 439                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 440                         ieee80211_send_nullfunc(local, sdata, 1);
 441                 conf->flags |= IEEE80211_CONF_PS;
 442                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 443         }
 444 }
 445
 446 static void ieee80211_change_ps(struct ieee80211_local *local)
 447 {
 448         struct ieee80211_conf *conf = &local->hw.conf;
 449
 450         if (local->ps_sdata) {
 451                 ieee80211_enable_ps(local, local->ps_sdata);
 452         } else if (conf->flags & IEEE80211_CONF_PS) {
 453                 conf->flags &= ~IEEE80211_CONF_PS;
 454                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 455                 del_timer_sync(&local->dynamic_ps_timer);
 456                 cancel_work_sync(&local->dynamic_ps_enable_work);
 457         }
 458 }
 459
 460 /* need to hold RTNL or interface lock */
 461 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 462 {
 463         struct ieee80211_sub_if_data *sdata, *found = NULL;
 464         int count = 0;
 465
 466         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 467                 local->ps_sdata = NULL;
 468                 return;
 469         }
 470
 471         if (!list_empty(&local->work_list)) {
 472                 local->ps_sdata = NULL;
 473                 goto change;
 474         }
 475
 476         list_for_each_entry(sdata, &local->interfaces, list) {
 477                 if (!ieee80211_sdata_running(sdata))
 478                         continue;
 479                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 480                         continue;
 481                 found = sdata;
 482                 count++;
 483         }
 484
 485         if (count == 1 && found->u.mgd.powersave &&
 486             found->u.mgd.associated &&
 487             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 488                                     IEEE80211_STA_CONNECTION_POLL))) {
 489                 s32 beaconint_us;
 490
 491                 if (latency < 0)
 492                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 493
 494                 beaconint_us = ieee80211_tu_to_usec(
 495                                         found->vif.bss_conf.beacon_int);
 496
 497                 if (beaconint_us > latency) {
 498                         local->ps_sdata = NULL;
 499                 } else {
 500                         u8 dtimper = found->vif.bss_conf.dtim_period;
 501                         int maxslp = 1;
 502
 503                         if (dtimper > 1)
 504                                 maxslp = min_t(int, dtimper,
 505                                                     latency / beaconint_us);
 506
 507                         local->hw.conf.max_sleep_period = maxslp;
 508                         local->ps_sdata = found;
 509                 }
 510         } else {
 511                 local->ps_sdata = NULL;
 512         }
 513
 514  change:
 515         ieee80211_change_ps(local);
 516 }
 517
 518 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 519 {
 520         struct ieee80211_local *local =
 521                 container_of(work, struct ieee80211_local,
 522                              dynamic_ps_disable_work);
 523
 524         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 525                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 526                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 527         }
 528
 529         ieee80211_wake_queues_by_reason(&local->hw,
 530                                         IEEE80211_QUEUE_STOP_REASON_PS);
 531 }
 532
 533 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 534 {
 535         struct ieee80211_local *local =
 536                 container_of(work, struct ieee80211_local,
 537                              dynamic_ps_enable_work);
 538         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 539
 540         /* can only happen when PS was just disabled anyway */
 541         if (!sdata)
 542                 return;
 543
 544         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 545                 return;
 546
 547         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 548                 ieee80211_send_nullfunc(local, sdata, 1);
 549
 550         local->hw.conf.flags |= IEEE80211_CONF_PS;
 551         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 552 }
 553
 554 void ieee80211_dynamic_ps_timer(unsigned long data)
 555 {
 556         struct ieee80211_local *local = (void *) data;
 557
 558         if (local->quiescing || local->suspended)
 559                 return;
 560
 561         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 562 }
 563
 564 /* MLME */
 565 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 566                                      struct ieee80211_if_managed *ifmgd,
 567                                      u8 *wmm_param, size_t wmm_param_len)
 568 {
 569         struct ieee80211_tx_queue_params params;
 570         size_t left;
 571         int count;
 572         u8 *pos;
 573
 574         if (local->hw.queues < 4)
 575                 return;
 576
 577         if (!wmm_param)
 578                 return;
 579
 580         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 581                 return;
 582         count = wmm_param[6] & 0x0f;
 583         if (count == ifmgd->wmm_last_param_set)
 584                 return;
 585         ifmgd->wmm_last_param_set = count;
 586
 587         pos = wmm_param + 8;
 588         left = wmm_param_len - 8;
 589
 590         memset(&params, 0, sizeof(params));
 591
 592         local->wmm_acm = 0;
 593         for (; left >= 4; left -= 4, pos += 4) {
 594                 int aci = (pos[0] >> 5) & 0x03;
 595                 int acm = (pos[0] >> 4) & 0x01;
 596                 int queue;
 597
 598                 switch (aci) {
 599                 case 1: /* AC_BK */
 600                         queue = 3;
 601                         if (acm)
 602                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 603                         break;
 604                 case 2: /* AC_VI */
 605                         queue = 1;
 606                         if (acm)
 607                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 608                         break;
 609                 case 3: /* AC_VO */
 610                         queue = 0;
 611                         if (acm)
 612                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 613                         break;
 614                 case 0: /* AC_BE */
 615                 default:
 616                         queue = 2;
 617                         if (acm)
 618                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 619                         break;
 620                 }
 621
 622                 params.aifs = pos[0] & 0x0f;
 623                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 624                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 625                 params.txop = get_unaligned_le16(pos + 2);
 626 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 627                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 628                        "cWmin=%d cWmax=%d txop=%d\n",
 629                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 630                        params.aifs, params.cw_min, params.cw_max, params.txop);
 631 #endif
 632                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
 633                         printk(KERN_DEBUG "%s: failed to set TX queue "
 634                                "parameters for queue %d\n",
 635                                wiphy_name(local->hw.wiphy), queue);
 636         }
 637 }
 638
 639 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 640                                            u16 capab, bool erp_valid, u8 erp)
 641 {
 642         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 643         u32 changed = 0;
 644         bool use_protection;
 645         bool use_short_preamble;
 646         bool use_short_slot;
 647
 648         if (erp_valid) {
 649                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 650                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 651         } else {
 652                 use_protection = false;
 653                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 654         }
 655
 656         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 657
 658         if (use_protection != bss_conf->use_cts_prot) {
 659                 bss_conf->use_cts_prot = use_protection;
 660                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 661         }
 662
 663         if (use_short_preamble != bss_conf->use_short_preamble) {
 664                 bss_conf->use_short_preamble = use_short_preamble;
 665                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 666         }
 667
 668         if (use_short_slot != bss_conf->use_short_slot) {
 669                 bss_conf->use_short_slot = use_short_slot;
 670                 changed |= BSS_CHANGED_ERP_SLOT;
 671         }
 672
 673         return changed;
 674 }
 675
 676 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 677                                      struct cfg80211_bss *cbss,
 678                                      u32 bss_info_changed)
 679 {
 680         struct ieee80211_bss *bss = (void *)cbss->priv;
 681         struct ieee80211_local *local = sdata->local;
 682
 683         bss_info_changed |= BSS_CHANGED_ASSOC;
 684         /* set timing information */
 685         sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
 686         sdata->vif.bss_conf.timestamp = cbss->tsf;
 687         sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 688
 689         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 690         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 691                 cbss->capability, bss->has_erp_value, bss->erp_value);
 692
 693         sdata->u.mgd.associated = cbss;
 694         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 695
 696         /* just to be sure */
 697         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 698                                 IEEE80211_STA_BEACON_POLL);
 699
 700         /*
 701          * Always handle WMM once after association regardless
 702          * of the first value the AP uses. Setting -1 here has
 703          * that effect because the AP values is an unsigned
 704          * 4-bit value.
 705          */
 706         sdata->u.mgd.wmm_last_param_set = -1;
 707
 708         ieee80211_led_assoc(local, 1);
 709
 710         sdata->vif.bss_conf.assoc = 1;
 711         /*
 712          * For now just always ask the driver to update the basic rateset
 713          * when we have associated, we aren't checking whether it actually
 714          * changed or not.
 715          */
 716         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 717
 718         /* And the BSSID changed - we're associated now */
 719         bss_info_changed |= BSS_CHANGED_BSSID;
 720
 721         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 722
 723         mutex_lock(&local->iflist_mtx);
 724         ieee80211_recalc_ps(local, -1);
 725         ieee80211_recalc_smps(local, sdata);
 726         mutex_unlock(&local->iflist_mtx);
 727
 728         netif_tx_start_all_queues(sdata->dev);
 729         netif_carrier_on(sdata->dev);
 730 }
 731
 732 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
 733 {
 734         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 735         struct ieee80211_local *local = sdata->local;
 736         struct sta_info *sta;
 737         u32 changed = 0, config_changed = 0;
 738         u8 bssid[ETH_ALEN];
 739
 740         ASSERT_MGD_MTX(ifmgd);
 741
 742         if (WARN_ON(!ifmgd->associated))
 743                 return;
 744
 745         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 746
 747         ifmgd->associated = NULL;
 748         memset(ifmgd->bssid, 0, ETH_ALEN);
 749
 750         /*
 751          * we need to commit the associated = NULL change because the
 752          * scan code uses that to determine whether this iface should
 753          * go to/wake up from powersave or not -- and could otherwise
 754          * wake the queues erroneously.
 755          */
 756         smp_mb();
 757
 758         /*
 759          * Thus, we can only afterwards stop the queues -- to account
 760          * for the case where another CPU is finishing a scan at this
 761          * time -- we don't want the scan code to enable queues.
 762          */
 763
 764         netif_tx_stop_all_queues(sdata->dev);
 765         netif_carrier_off(sdata->dev);
 766
 767         rcu_read_lock();
 768         sta = sta_info_get(sdata, bssid);
 769         if (sta)
 770                 ieee80211_sta_tear_down_BA_sessions(sta);
 771         rcu_read_unlock();
 772
 773         changed |= ieee80211_reset_erp_info(sdata);
 774
 775         ieee80211_led_assoc(local, 0);
 776         changed |= BSS_CHANGED_ASSOC;
 777         sdata->vif.bss_conf.assoc = false;
 778
 779         ieee80211_set_wmm_default(sdata);
 780
 781         /* channel(_type) changes are handled by ieee80211_hw_config */
 782         local->oper_channel_type = NL80211_CHAN_NO_HT;
 783
 784         /* on the next assoc, re-program HT parameters */
 785         sdata->ht_opmode_valid = false;
 786
 787         local->power_constr_level = 0;
 788
 789         del_timer_sync(&local->dynamic_ps_timer);
 790         cancel_work_sync(&local->dynamic_ps_enable_work);
 791
 792         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 793                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 794                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 795         }
 796
 797         ieee80211_hw_config(local, config_changed);
 798
 799         /* And the BSSID changed -- not very interesting here */
 800         changed |= BSS_CHANGED_BSSID;
 801         ieee80211_bss_info_change_notify(sdata, changed);
 802
 803         rcu_read_lock();
 804
 805         sta = sta_info_get(sdata, bssid);
 806         if (!sta) {
 807                 rcu_read_unlock();
 808                 return;
 809         }
 810
 811         sta_info_unlink(&sta);
 812
 813         rcu_read_unlock();
 814
 815         sta_info_destroy(sta);
 816 }
 817
 818 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 819                              struct ieee80211_hdr *hdr)
 820 {
 821         /*
 822          * We can postpone the mgd.timer whenever receiving unicast frames
 823          * from AP because we know that the connection is working both ways
 824          * at that time. But multicast frames (and hence also beacons) must
 825          * be ignored here, because we need to trigger the timer during
 826          * data idle periods for sending the periodic probe request to the
 827          * AP we're connected to.
 828          */
 829         if (is_multicast_ether_addr(hdr->addr1))
 830                 return;
 831
 832         mod_timer(&sdata->u.mgd.conn_mon_timer,
 833                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 834 }
 835
 836 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
 837 {
 838         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 839         const u8 *ssid;
 840
 841         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
 842         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
 843                                  ssid + 2, ssid[1], NULL, 0);
 844
 845         ifmgd->probe_send_count++;
 846         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
 847         run_again(ifmgd, ifmgd->probe_timeout);
 848 }
 849
 850 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
 851                                    bool beacon)
 852 {
 853         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 854         bool already = false;
 855
 856         if (!ieee80211_sdata_running(sdata))
 857                 return;
 858
 859         if (sdata->local->scanning)
 860                 return;
 861
 862         if (sdata->local->tmp_channel)
 863                 return;
 864
 865         mutex_lock(&ifmgd->mtx);
 866
 867         if (!ifmgd->associated)
 868                 goto out;
 869
 870 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 871         if (beacon && net_ratelimit())
 872                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
 873                        "- sending probe request\n", sdata->name);
 874 #endif
 875
 876         /*
 877          * The driver/our work has already reported this event or the
 878          * connection monitoring has kicked in and we have already sent
 879          * a probe request. Or maybe the AP died and the driver keeps
 880          * reporting until we disassociate...
 881          *
 882          * In either case we have to ignore the current call to this
 883          * function (except for setting the correct probe reason bit)
 884          * because otherwise we would reset the timer every time and
 885          * never check whether we received a probe response!
 886          */
 887         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 888                             IEEE80211_STA_CONNECTION_POLL))
 889                 already = true;
 890
 891         if (beacon)
 892                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
 893         else
 894                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
 895
 896         if (already)
 897                 goto out;
 898
 899         mutex_lock(&sdata->local->iflist_mtx);
 900         ieee80211_recalc_ps(sdata->local, -1);
 901         mutex_unlock(&sdata->local->iflist_mtx);
 902
 903         ifmgd->probe_send_count = 0;
 904         ieee80211_mgd_probe_ap_send(sdata);
 905  out:
 906         mutex_unlock(&ifmgd->mtx);
 907 }
 908
 909 void ieee80211_beacon_loss_work(struct work_struct *work)
 910 {
 911         struct ieee80211_sub_if_data *sdata =
 912                 container_of(work, struct ieee80211_sub_if_data,
 913                              u.mgd.beacon_loss_work);
 914
 915         ieee80211_mgd_probe_ap(sdata, true);
 916 }
 917
 918 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
 919 {
 920         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 921
 922         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
 923 }
 924 EXPORT_SYMBOL(ieee80211_beacon_loss);
 925
 926 static enum rx_mgmt_action __must_check
 927 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
 928                          struct ieee80211_mgmt *mgmt, size_t len)
 929 {
 930         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 931         const u8 *bssid = NULL;
 932         u16 reason_code;
 933
 934         if (len < 24 + 2)
 935                 return RX_MGMT_NONE;
 936
 937         ASSERT_MGD_MTX(ifmgd);
 938
 939         bssid = ifmgd->associated->bssid;
 940
 941         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
 942
 943         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
 944                         sdata->name, bssid, reason_code);
 945
 946         ieee80211_set_disassoc(sdata);
 947         ieee80211_recalc_idle(sdata->local);
 948
 949         return RX_MGMT_CFG80211_DEAUTH;
 950 }
 951
 952
 953 static enum rx_mgmt_action __must_check
 954 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
 955                            struct ieee80211_mgmt *mgmt, size_t len)
 956 {
 957         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 958         u16 reason_code;
 959
 960         if (len < 24 + 2)
 961                 return RX_MGMT_NONE;
 962
 963         ASSERT_MGD_MTX(ifmgd);
 964
 965         if (WARN_ON(!ifmgd->associated))
 966                 return RX_MGMT_NONE;
 967
 968         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
 969                 return RX_MGMT_NONE;
 970
 971         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
 972
 973         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
 974                         sdata->name, mgmt->sa, reason_code);
 975
 976         ieee80211_set_disassoc(sdata);
 977         ieee80211_recalc_idle(sdata->local);
 978         return RX_MGMT_CFG80211_DISASSOC;
 979 }
 980
 981
 982 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
 983                                     struct ieee80211_mgmt *mgmt, size_t len)
 984 {
 985         struct ieee80211_sub_if_data *sdata = wk->sdata;
 986         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 987         struct ieee80211_local *local = sdata->local;
 988         struct ieee80211_supported_band *sband;
 989         struct sta_info *sta;
 990         struct cfg80211_bss *cbss = wk->assoc.bss;
 991         u8 *pos;
 992         u32 rates, basic_rates;
 993         u16 capab_info, aid;
 994         struct ieee802_11_elems elems;
 995         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 996         u32 changed = 0;
 997         int i, j, err;
 998         bool have_higher_than_11mbit = false;
 999         u16 ap_ht_cap_flags;
1000
1001         /* AssocResp and ReassocResp have identical structure */
1002
1003         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1004         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1005
1006         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1007                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1008                        "set\n", sdata->name, aid);
1009         aid &= ~(BIT(15) | BIT(14));
1010
1011         pos = mgmt->u.assoc_resp.variable;
1012         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1013
1014         if (!elems.supp_rates) {
1015                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1016                        sdata->name);
1017                 return false;
1018         }
1019
1020         ifmgd->aid = aid;
1021
1022         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1023         if (!sta) {
1024                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1025                        " the AP\n", sdata->name);
1026                 return false;
1027         }
1028
1029         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1030                            WLAN_STA_ASSOC_AP);
1031         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1032                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1033
1034         rates = 0;
1035         basic_rates = 0;
1036         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1037
1038         for (i = 0; i < elems.supp_rates_len; i++) {
1039                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1040                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1041
1042                 if (rate > 110)
1043                         have_higher_than_11mbit = true;
1044
1045                 for (j = 0; j < sband->n_bitrates; j++) {
1046                         if (sband->bitrates[j].bitrate == rate) {
1047                                 rates |= BIT(j);
1048                                 if (is_basic)
1049                                         basic_rates |= BIT(j);
1050                                 break;
1051                         }
1052                 }
1053         }
1054
1055         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1056                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1057                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1058
1059                 if (rate > 110)
1060                         have_higher_than_11mbit = true;
1061
1062                 for (j = 0; j < sband->n_bitrates; j++) {
1063                         if (sband->bitrates[j].bitrate == rate) {
1064                                 rates |= BIT(j);
1065                                 if (is_basic)
1066                                         basic_rates |= BIT(j);
1067                                 break;
1068                         }
1069                 }
1070         }
1071
1072         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1073         sdata->vif.bss_conf.basic_rates = basic_rates;
1074
1075         /* cf. IEEE 802.11 9.2.12 */
1076         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1077             have_higher_than_11mbit)
1078                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1079         else
1080                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1081
1082         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1083                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1084                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1085
1086         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1087
1088         rate_control_rate_init(sta);
1089
1090         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1091                 set_sta_flags(sta, WLAN_STA_MFP);
1092
1093         if (elems.wmm_param)
1094                 set_sta_flags(sta, WLAN_STA_WME);
1095
1096         err = sta_info_insert(sta);
1097         sta = NULL;
1098         if (err) {
1099                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1100                        " the AP (error %d)\n", sdata->name, err);
1101                 return false;
1102         }
1103
1104         if (elems.wmm_param)
1105                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1106                                          elems.wmm_param_len);
1107         else
1108                 ieee80211_set_wmm_default(sdata);
1109
1110         local->oper_channel = wk->chan;
1111
1112         if (elems.ht_info_elem && elems.wmm_param &&
1113             (sdata->local->hw.queues >= 4) &&
1114             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1115                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1116                                                cbss->bssid, ap_ht_cap_flags);
1117
1118         /* set AID and assoc capability,
1119          * ieee80211_set_associated() will tell the driver */
1120         bss_conf->aid = aid;
1121         bss_conf->assoc_capability = capab_info;
1122         ieee80211_set_associated(sdata, cbss, changed);
1123
1124         /*
1125          * If we're using 4-addr mode, let the AP know that we're
1126          * doing so, so that it can create the STA VLAN on its side
1127          */
1128         if (ifmgd->use_4addr)
1129                 ieee80211_send_4addr_nullfunc(local, sdata);
1130
1131         /*
1132          * Start timer to probe the connection to the AP now.
1133          * Also start the timer that will detect beacon loss.
1134          */
1135         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1136         mod_beacon_timer(sdata);
1137
1138         return true;
1139 }
1140
1141
1142 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1143                                   struct ieee80211_mgmt *mgmt,
1144                                   size_t len,
1145                                   struct ieee80211_rx_status *rx_status,
1146                                   struct ieee802_11_elems *elems,
1147                                   bool beacon)
1148 {
1149         struct ieee80211_local *local = sdata->local;
1150         int freq;
1151         struct ieee80211_bss *bss;
1152         struct ieee80211_channel *channel;
1153
1154         if (elems->ds_params && elems->ds_params_len == 1)
1155                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1156         else
1157                 freq = rx_status->freq;
1158
1159         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1160
1161         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1162                 return;
1163
1164         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1165                                         channel, beacon);
1166         if (bss)
1167                 ieee80211_rx_bss_put(local, bss);
1168
1169         if (!sdata->u.mgd.associated)
1170                 return;
1171
1172         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1173             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1174                                                         ETH_ALEN) == 0)) {
1175                 struct ieee80211_channel_sw_ie *sw_elem =
1176                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1177                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1178         }
1179 }
1180
1181
1182 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1183                                          struct sk_buff *skb)
1184 {
1185         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1186         struct ieee80211_if_managed *ifmgd;
1187         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1188         size_t baselen, len = skb->len;
1189         struct ieee802_11_elems elems;
1190
1191         ifmgd = &sdata->u.mgd;
1192
1193         ASSERT_MGD_MTX(ifmgd);
1194
1195         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1196                 return; /* ignore ProbeResp to foreign address */
1197
1198         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1199         if (baselen > len)
1200                 return;
1201
1202         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1203                                 &elems);
1204
1205         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1206
1207         if (ifmgd->associated &&
1208             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1209             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1210                             IEEE80211_STA_CONNECTION_POLL)) {
1211                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1212                                   IEEE80211_STA_BEACON_POLL);
1213                 mutex_lock(&sdata->local->iflist_mtx);
1214                 ieee80211_recalc_ps(sdata->local, -1);
1215                 mutex_unlock(&sdata->local->iflist_mtx);
1216                 /*
1217                  * We've received a probe response, but are not sure whether
1218                  * we have or will be receiving any beacons or data, so let's
1219                  * schedule the timers again, just in case.
1220                  */
1221                 mod_beacon_timer(sdata);
1222                 mod_timer(&ifmgd->conn_mon_timer,
1223                           round_jiffies_up(jiffies +
1224                                            IEEE80211_CONNECTION_IDLE_TIME));
1225         }
1226 }
1227
1228 /*
1229  * This is the canonical list of information elements we care about,
1230  * the filter code also gives us all changes to the Microsoft OUI
1231  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1232  *
1233  * We implement beacon filtering in software since that means we can
1234  * avoid processing the frame here and in cfg80211, and userspace
1235  * will not be able to tell whether the hardware supports it or not.
1236  *
1237  * XXX: This list needs to be dynamic -- userspace needs to be able to
1238  *      add items it requires. It also needs to be able to tell us to
1239  *      look out for other vendor IEs.
1240  */
1241 static const u64 care_about_ies =
1242         (1ULL << WLAN_EID_COUNTRY) |
1243         (1ULL << WLAN_EID_ERP_INFO) |
1244         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1245         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1246         (1ULL << WLAN_EID_HT_CAPABILITY) |
1247         (1ULL << WLAN_EID_HT_INFORMATION);
1248
1249 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1250                                      struct ieee80211_mgmt *mgmt,
1251                                      size_t len,
1252                                      struct ieee80211_rx_status *rx_status)
1253 {
1254         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1255         size_t baselen;
1256         struct ieee802_11_elems elems;
1257         struct ieee80211_local *local = sdata->local;
1258         u32 changed = 0;
1259         bool erp_valid, directed_tim = false;
1260         u8 erp_value = 0;
1261         u32 ncrc;
1262         u8 *bssid;
1263
1264         ASSERT_MGD_MTX(ifmgd);
1265
1266         /* Process beacon from the current BSS */
1267         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1268         if (baselen > len)
1269                 return;
1270
1271         if (rx_status->freq != local->hw.conf.channel->center_freq)
1272                 return;
1273
1274         /*
1275          * We might have received a number of frames, among them a
1276          * disassoc frame and a beacon...
1277          */
1278         if (!ifmgd->associated)
1279                 return;
1280
1281         bssid = ifmgd->associated->bssid;
1282
1283         /*
1284          * And in theory even frames from a different AP we were just
1285          * associated to a split-second ago!
1286          */
1287         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1288                 return;
1289
1290         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1291 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1292                 if (net_ratelimit()) {
1293                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1294                                "to a received beacon\n", sdata->name);
1295                 }
1296 #endif
1297                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1298                 mutex_lock(&local->iflist_mtx);
1299                 ieee80211_recalc_ps(local, -1);
1300                 mutex_unlock(&local->iflist_mtx);
1301         }
1302
1303         /*
1304          * Push the beacon loss detection into the future since
1305          * we are processing a beacon from the AP just now.
1306          */
1307         mod_beacon_timer(sdata);
1308
1309         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1310         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1311                                           len - baselen, &elems,
1312                                           care_about_ies, ncrc);
1313
1314         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1315                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1316                                                    ifmgd->aid);
1317
1318         if (ncrc != ifmgd->beacon_crc) {
1319                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1320                                       true);
1321
1322                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1323                                          elems.wmm_param_len);
1324         }
1325
1326         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1327                 if (directed_tim) {
1328                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1329                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1330                                 ieee80211_hw_config(local,
1331                                                     IEEE80211_CONF_CHANGE_PS);
1332                                 ieee80211_send_nullfunc(local, sdata, 0);
1333                         } else {
1334                                 local->pspolling = true;
1335
1336                                 /*
1337                                  * Here is assumed that the driver will be
1338                                  * able to send ps-poll frame and receive a
1339                                  * response even though power save mode is
1340                                  * enabled, but some drivers might require
1341                                  * to disable power save here. This needs
1342                                  * to be investigated.
1343                                  */
1344                                 ieee80211_send_pspoll(local, sdata);
1345                         }
1346                 }
1347         }
1348
1349         if (ncrc == ifmgd->beacon_crc)
1350                 return;
1351         ifmgd->beacon_crc = ncrc;
1352
1353         if (elems.erp_info && elems.erp_info_len >= 1) {
1354                 erp_valid = true;
1355                 erp_value = elems.erp_info[0];
1356         } else {
1357                 erp_valid = false;
1358         }
1359         changed |= ieee80211_handle_bss_capability(sdata,
1360                         le16_to_cpu(mgmt->u.beacon.capab_info),
1361                         erp_valid, erp_value);
1362
1363
1364         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1365             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1366                 struct sta_info *sta;
1367                 struct ieee80211_supported_band *sband;
1368                 u16 ap_ht_cap_flags;
1369
1370                 rcu_read_lock();
1371
1372                 sta = sta_info_get(sdata, bssid);
1373                 if (WARN_ON(!sta)) {
1374                         rcu_read_unlock();
1375                         return;
1376                 }
1377
1378                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1379
1380                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1381                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1382
1383                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1384
1385                 rcu_read_unlock();
1386
1387                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1388                                                bssid, ap_ht_cap_flags);
1389         }
1390
1391         /* Note: country IE parsing is done for us by cfg80211 */
1392         if (elems.country_elem) {
1393                 /* TODO: IBSS also needs this */
1394                 if (elems.pwr_constr_elem)
1395                         ieee80211_handle_pwr_constr(sdata,
1396                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1397                                 elems.pwr_constr_elem,
1398                                 elems.pwr_constr_elem_len);
1399         }
1400
1401         ieee80211_bss_info_change_notify(sdata, changed);
1402 }
1403
1404 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1405                                           struct sk_buff *skb)
1406 {
1407         struct ieee80211_local *local = sdata->local;
1408         struct ieee80211_mgmt *mgmt;
1409         u16 fc;
1410
1411         if (skb->len < 24)
1412                 return RX_DROP_MONITOR;
1413
1414         mgmt = (struct ieee80211_mgmt *) skb->data;
1415         fc = le16_to_cpu(mgmt->frame_control);
1416
1417         switch (fc & IEEE80211_FCTL_STYPE) {
1418         case IEEE80211_STYPE_PROBE_RESP:
1419         case IEEE80211_STYPE_BEACON:
1420         case IEEE80211_STYPE_DEAUTH:
1421         case IEEE80211_STYPE_DISASSOC:
1422         case IEEE80211_STYPE_ACTION:
1423                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1424                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1425                 return RX_QUEUED;
1426         }
1427
1428         return RX_DROP_MONITOR;
1429 }
1430
1431 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1432                                          struct sk_buff *skb)
1433 {
1434         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1435         struct ieee80211_rx_status *rx_status;
1436         struct ieee80211_mgmt *mgmt;
1437         enum rx_mgmt_action rma = RX_MGMT_NONE;
1438         u16 fc;
1439
1440         rx_status = (struct ieee80211_rx_status *) skb->cb;
1441         mgmt = (struct ieee80211_mgmt *) skb->data;
1442         fc = le16_to_cpu(mgmt->frame_control);
1443
1444         mutex_lock(&ifmgd->mtx);
1445
1446         if (ifmgd->associated &&
1447             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1448                 switch (fc & IEEE80211_FCTL_STYPE) {
1449                 case IEEE80211_STYPE_BEACON:
1450                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1451                                                  rx_status);
1452                         break;
1453                 case IEEE80211_STYPE_PROBE_RESP:
1454                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1455                         break;
1456                 case IEEE80211_STYPE_DEAUTH:
1457                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1458                         break;
1459                 case IEEE80211_STYPE_DISASSOC:
1460                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1461                         break;
1462                 case IEEE80211_STYPE_ACTION:
1463                         /* XXX: differentiate, can only happen for CSA now! */
1464                         ieee80211_sta_process_chanswitch(sdata,
1465                                         &mgmt->u.action.u.chan_switch.sw_elem,
1466                                         (void *)ifmgd->associated->priv);
1467                         break;
1468                 }
1469                 mutex_unlock(&ifmgd->mtx);
1470
1471                 switch (rma) {
1472                 case RX_MGMT_NONE:
1473                         /* no action */
1474                         break;
1475                 case RX_MGMT_CFG80211_DEAUTH:
1476                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1477                         break;
1478                 case RX_MGMT_CFG80211_DISASSOC:
1479                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1480                         break;
1481                 default:
1482                         WARN(1, "unexpected: %d", rma);
1483                 }
1484                 goto out;
1485         }
1486
1487         mutex_unlock(&ifmgd->mtx);
1488
1489         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1490             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1491                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1492
1493  out:
1494         kfree_skb(skb);
1495 }
1496
1497 static void ieee80211_sta_timer(unsigned long data)
1498 {
1499         struct ieee80211_sub_if_data *sdata =
1500                 (struct ieee80211_sub_if_data *) data;
1501         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1502         struct ieee80211_local *local = sdata->local;
1503
1504         if (local->quiescing) {
1505                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1506                 return;
1507         }
1508
1509         ieee80211_queue_work(&local->hw, &ifmgd->work);
1510 }
1511
1512 static void ieee80211_sta_work(struct work_struct *work)
1513 {
1514         struct ieee80211_sub_if_data *sdata =
1515                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1516         struct ieee80211_local *local = sdata->local;
1517         struct ieee80211_if_managed *ifmgd;
1518         struct sk_buff *skb;
1519
1520         if (!ieee80211_sdata_running(sdata))
1521                 return;
1522
1523         if (local->scanning)
1524                 return;
1525
1526         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1527                 return;
1528
1529         /*
1530          * ieee80211_queue_work() should have picked up most cases,
1531          * here we'll pick the the rest.
1532          */
1533         if (WARN(local->suspended, "STA MLME work scheduled while "
1534                  "going to suspend\n"))
1535                 return;
1536
1537         ifmgd = &sdata->u.mgd;
1538
1539         /* first process frames to avoid timing out while a frame is pending */
1540         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1541                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1542
1543         /* then process the rest of the work */
1544         mutex_lock(&ifmgd->mtx);
1545
1546         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1547                             IEEE80211_STA_CONNECTION_POLL) &&
1548             ifmgd->associated) {
1549                 u8 bssid[ETH_ALEN];
1550
1551                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1552                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1553                         run_again(ifmgd, ifmgd->probe_timeout);
1554
1555                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1556 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1557                         printk(KERN_DEBUG "No probe response from AP %pM"
1558                                 " after %dms, try %d\n", bssid,
1559                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1560                                 ifmgd->probe_send_count);
1561 #endif
1562                         ieee80211_mgd_probe_ap_send(sdata);
1563                 } else {
1564                         /*
1565                          * We actually lost the connection ... or did we?
1566                          * Let's make sure!
1567                          */
1568                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1569                                           IEEE80211_STA_BEACON_POLL);
1570                         printk(KERN_DEBUG "No probe response from AP %pM"
1571                                 " after %dms, disconnecting.\n",
1572                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1573                         ieee80211_set_disassoc(sdata);
1574                         ieee80211_recalc_idle(local);
1575                         mutex_unlock(&ifmgd->mtx);
1576                         /*
1577                          * must be outside lock due to cfg80211,
1578                          * but that's not a problem.
1579                          */
1580                         ieee80211_send_deauth_disassoc(sdata, bssid,
1581                                         IEEE80211_STYPE_DEAUTH,
1582                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1583                                         NULL);
1584                         mutex_lock(&ifmgd->mtx);
1585                 }
1586         }
1587
1588         mutex_unlock(&ifmgd->mtx);
1589 }
1590
1591 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1592 {
1593         struct ieee80211_sub_if_data *sdata =
1594                 (struct ieee80211_sub_if_data *) data;
1595         struct ieee80211_local *local = sdata->local;
1596
1597         if (local->quiescing)
1598                 return;
1599
1600         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1601 }
1602
1603 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1604 {
1605         struct ieee80211_sub_if_data *sdata =
1606                 (struct ieee80211_sub_if_data *) data;
1607         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1608         struct ieee80211_local *local = sdata->local;
1609
1610         if (local->quiescing)
1611                 return;
1612
1613         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1614 }
1615
1616 static void ieee80211_sta_monitor_work(struct work_struct *work)
1617 {
1618         struct ieee80211_sub_if_data *sdata =
1619                 container_of(work, struct ieee80211_sub_if_data,
1620                              u.mgd.monitor_work);
1621
1622         ieee80211_mgd_probe_ap(sdata, false);
1623 }
1624
1625 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1626 {
1627         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1628                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1629                                         IEEE80211_STA_CONNECTION_POLL);
1630
1631                 /* let's probe the connection once */
1632                 ieee80211_queue_work(&sdata->local->hw,
1633                            &sdata->u.mgd.monitor_work);
1634                 /* and do all the other regular work too */
1635                 ieee80211_queue_work(&sdata->local->hw,
1636                            &sdata->u.mgd.work);
1637         }
1638 }
1639
1640 #ifdef CONFIG_PM
1641 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1642 {
1643         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1644
1645         /*
1646          * we need to use atomic bitops for the running bits
1647          * only because both timers might fire at the same
1648          * time -- the code here is properly synchronised.
1649          */
1650
1651         cancel_work_sync(&ifmgd->work);
1652         cancel_work_sync(&ifmgd->beacon_loss_work);
1653         if (del_timer_sync(&ifmgd->timer))
1654                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1655
1656         cancel_work_sync(&ifmgd->chswitch_work);
1657         if (del_timer_sync(&ifmgd->chswitch_timer))
1658                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1659
1660         cancel_work_sync(&ifmgd->monitor_work);
1661         /* these will just be re-established on connection */
1662         del_timer_sync(&ifmgd->conn_mon_timer);
1663         del_timer_sync(&ifmgd->bcn_mon_timer);
1664 }
1665
1666 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1667 {
1668         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1669
1670         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1671                 add_timer(&ifmgd->timer);
1672         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1673                 add_timer(&ifmgd->chswitch_timer);
1674 }
1675 #endif
1676
1677 /* interface setup */
1678 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1679 {
1680         struct ieee80211_if_managed *ifmgd;
1681
1682         ifmgd = &sdata->u.mgd;
1683         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1684         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1685         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1686         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
1687         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1688                     (unsigned long) sdata);
1689         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1690                     (unsigned long) sdata);
1691         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1692                     (unsigned long) sdata);
1693         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1694                     (unsigned long) sdata);
1695         skb_queue_head_init(&ifmgd->skb_queue);
1696
1697         ifmgd->flags = 0;
1698
1699         mutex_init(&ifmgd->mtx);
1700
1701         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1702                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1703         else
1704                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1705 }
1706
1707 /* scan finished notification */
1708 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1709 {
1710         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1711
1712         /* Restart STA timers */
1713         rcu_read_lock();
1714         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1715                 ieee80211_restart_sta_timer(sdata);
1716         rcu_read_unlock();
1717 }
1718
1719 int ieee80211_max_network_latency(struct notifier_block *nb,
1720                                   unsigned long data, void *dummy)
1721 {
1722         s32 latency_usec = (s32) data;
1723         struct ieee80211_local *local =
1724                 container_of(nb, struct ieee80211_local,
1725                              network_latency_notifier);
1726
1727         mutex_lock(&local->iflist_mtx);
1728         ieee80211_recalc_ps(local, latency_usec);
1729         mutex_unlock(&local->iflist_mtx);
1730
1731         return 0;
1732 }
1733
1734 /* config hooks */
1735 static enum work_done_result
1736 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1737                           struct sk_buff *skb)
1738 {
1739         if (!skb) {
1740                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1741                 return WORK_DONE_DESTROY;
1742         }
1743
1744         if (wk->type == IEEE80211_WORK_AUTH) {
1745                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1746                 return WORK_DONE_DESTROY;
1747         }
1748
1749         mutex_lock(&wk->sdata->u.mgd.mtx);
1750         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1751         mutex_unlock(&wk->sdata->u.mgd.mtx);
1752
1753         wk->type = IEEE80211_WORK_AUTH;
1754         wk->probe_auth.tries = 0;
1755         return WORK_DONE_REQUEUE;
1756 }
1757
1758 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1759                        struct cfg80211_auth_request *req)
1760 {
1761         const u8 *ssid;
1762         struct ieee80211_work *wk;
1763         u16 auth_alg;
1764
1765         switch (req->auth_type) {
1766         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1767                 auth_alg = WLAN_AUTH_OPEN;
1768                 break;
1769         case NL80211_AUTHTYPE_SHARED_KEY:
1770                 auth_alg = WLAN_AUTH_SHARED_KEY;
1771                 break;
1772         case NL80211_AUTHTYPE_FT:
1773                 auth_alg = WLAN_AUTH_FT;
1774                 break;
1775         case NL80211_AUTHTYPE_NETWORK_EAP:
1776                 auth_alg = WLAN_AUTH_LEAP;
1777                 break;
1778         default:
1779                 return -EOPNOTSUPP;
1780         }
1781
1782         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1783         if (!wk)
1784                 return -ENOMEM;
1785
1786         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);;
1787
1788         if (req->ie && req->ie_len) {
1789                 memcpy(wk->ie, req->ie, req->ie_len);
1790                 wk->ie_len = req->ie_len;
1791         }
1792
1793         if (req->key && req->key_len) {
1794                 wk->probe_auth.key_len = req->key_len;
1795                 wk->probe_auth.key_idx = req->key_idx;
1796                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1797         }
1798
1799         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1800         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1801         wk->probe_auth.ssid_len = ssid[1];
1802
1803         wk->probe_auth.algorithm = auth_alg;
1804         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1805
1806         wk->type = IEEE80211_WORK_DIRECT_PROBE;
1807         wk->chan = req->bss->channel;
1808         wk->sdata = sdata;
1809         wk->done = ieee80211_probe_auth_done;
1810
1811         ieee80211_add_work(wk);
1812         return 0;
1813 }
1814
1815 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1816                                                   struct sk_buff *skb)
1817 {
1818         struct ieee80211_mgmt *mgmt;
1819         u16 status;
1820
1821         if (!skb) {
1822                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1823                 return WORK_DONE_DESTROY;
1824         }
1825
1826         mgmt = (void *)skb->data;
1827         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1828
1829         if (status == WLAN_STATUS_SUCCESS) {
1830                 mutex_lock(&wk->sdata->u.mgd.mtx);
1831                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1832                         mutex_unlock(&wk->sdata->u.mgd.mtx);
1833                         /* oops -- internal error -- send timeout for now */
1834                         cfg80211_send_assoc_timeout(wk->sdata->dev,
1835                                                     wk->filter_ta);
1836                         return WORK_DONE_DESTROY;
1837                 }
1838                 mutex_unlock(&wk->sdata->u.mgd.mtx);
1839         }
1840
1841         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1842         return WORK_DONE_DESTROY;
1843 }
1844
1845 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1846                         struct cfg80211_assoc_request *req)
1847 {
1848         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1849         struct ieee80211_bss *bss = (void *)req->bss->priv;
1850         struct ieee80211_work *wk;
1851         const u8 *ssid;
1852         int i;
1853
1854         mutex_lock(&ifmgd->mtx);
1855         if (ifmgd->associated) {
1856                 mutex_unlock(&ifmgd->mtx);
1857                 return -EALREADY;
1858         }
1859         mutex_unlock(&ifmgd->mtx);
1860
1861         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1862         if (!wk)
1863                 return -ENOMEM;
1864
1865         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
1866
1867         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
1868                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
1869                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
1870                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
1871                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
1872
1873
1874         if (req->ie && req->ie_len) {
1875                 memcpy(wk->ie, req->ie, req->ie_len);
1876                 wk->ie_len = req->ie_len;
1877         } else
1878                 wk->ie_len = 0;
1879
1880         wk->assoc.bss = req->bss;
1881
1882         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1883
1884         /* new association always uses requested smps mode */
1885         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
1886                 if (ifmgd->powersave)
1887                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
1888                 else
1889                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
1890         } else
1891                 ifmgd->ap_smps = ifmgd->req_smps;
1892
1893         wk->assoc.smps = ifmgd->ap_smps;
1894         /*
1895          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
1896          * We still associate in non-HT mode (11a/b/g) if any one of these
1897          * ciphers is configured as pairwise.
1898          * We can set this to true for non-11n hardware, that'll be checked
1899          * separately along with the peer capabilities.
1900          */
1901         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
1902         wk->assoc.capability = req->bss->capability;
1903         wk->assoc.wmm_used = bss->wmm_used;
1904         wk->assoc.supp_rates = bss->supp_rates;
1905         wk->assoc.supp_rates_len = bss->supp_rates_len;
1906         wk->assoc.ht_information_ie =
1907                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
1908
1909         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1910         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
1911         wk->assoc.ssid_len = ssid[1];
1912
1913         if (req->prev_bssid)
1914                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
1915
1916         wk->type = IEEE80211_WORK_ASSOC;
1917         wk->chan = req->bss->channel;
1918         wk->sdata = sdata;
1919         wk->done = ieee80211_assoc_done;
1920
1921         if (req->use_mfp) {
1922                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
1923                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
1924         } else {
1925                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
1926                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
1927         }
1928
1929         if (req->crypto.control_port)
1930                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
1931         else
1932                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
1933
1934         ieee80211_add_work(wk);
1935         return 0;
1936 }
1937
1938 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
1939                          struct cfg80211_deauth_request *req,
1940                          void *cookie)
1941 {
1942         struct ieee80211_local *local = sdata->local;
1943         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1944         struct ieee80211_work *wk;
1945         const u8 *bssid = req->bss->bssid;
1946
1947         mutex_lock(&ifmgd->mtx);
1948
1949         if (ifmgd->associated == req->bss) {
1950                 bssid = req->bss->bssid;
1951                 ieee80211_set_disassoc(sdata);
1952                 mutex_unlock(&ifmgd->mtx);
1953         } else {
1954                 bool not_auth_yet = false;
1955
1956                 mutex_unlock(&ifmgd->mtx);
1957
1958                 mutex_lock(&local->work_mtx);
1959                 list_for_each_entry(wk, &local->work_list, list) {
1960                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE)
1961                                 continue;
1962                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
1963                                 continue;
1964                         not_auth_yet = true;
1965                         list_del(&wk->list);
1966                         free_work(wk);
1967                         break;
1968                 }
1969                 mutex_unlock(&local->work_mtx);
1970
1971                 /*
1972                  * If somebody requests authentication and we haven't
1973                  * sent out an auth frame yet there's no need to send
1974                  * out a deauth frame either. If the state was PROBE,
1975                  * then this is the case. If it's AUTH we have sent a
1976                  * frame, and if it's IDLE we have completed the auth
1977                  * process already.
1978                  */
1979                 if (not_auth_yet) {
1980                         __cfg80211_auth_canceled(sdata->dev, bssid);
1981                         return 0;
1982                 }
1983         }
1984
1985         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
1986                sdata->name, bssid, req->reason_code);
1987
1988         ieee80211_send_deauth_disassoc(sdata, bssid,
1989                         IEEE80211_STYPE_DEAUTH, req->reason_code,
1990                         cookie);
1991
1992         ieee80211_recalc_idle(sdata->local);
1993
1994         return 0;
1995 }
1996
1997 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
1998                            struct cfg80211_disassoc_request *req,
1999                            void *cookie)
2000 {
2001         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2002
2003         mutex_lock(&ifmgd->mtx);
2004
2005         /*
2006          * cfg80211 should catch this ... but it's racy since
2007          * we can receive a disassoc frame, process it, hand it
2008          * to cfg80211 while that's in a locked section already
2009          * trying to tell us that the user wants to disconnect.
2010          */
2011         if (ifmgd->associated != req->bss) {
2012                 mutex_unlock(&ifmgd->mtx);
2013                 return -ENOLINK;
2014         }
2015
2016         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2017                sdata->name, req->bss->bssid, req->reason_code);
2018
2019         ieee80211_set_disassoc(sdata);
2020
2021         mutex_unlock(&ifmgd->mtx);
2022
2023         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2024                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2025                         cookie);
2026
2027         ieee80211_recalc_idle(sdata->local);
2028
2029         return 0;
2030 }