SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 #define TMR_RUNNING_TIMER       0
  50 #define TMR_RUNNING_CHANSW      1
  51
  52 /*
  53  * All cfg80211 functions have to be called outside a locked
  54  * section so that they can acquire a lock themselves... This
  55  * is much simpler than queuing up things in cfg80211, but we
  56  * do need some indirection for that here.
  57  */
  58 enum rx_mgmt_action {
  59         /* no action required */
  60         RX_MGMT_NONE,
  61
  62         /* caller must call cfg80211_send_rx_auth() */
  63         RX_MGMT_CFG80211_AUTH,
  64
  65         /* caller must call cfg80211_send_rx_assoc() */
  66         RX_MGMT_CFG80211_ASSOC,
  67
  68         /* caller must call cfg80211_send_deauth() */
  69         RX_MGMT_CFG80211_DEAUTH,
  70
  71         /* caller must call cfg80211_send_disassoc() */
  72         RX_MGMT_CFG80211_DISASSOC,
  73
  74         /* caller must tell cfg80211 about internal error */
  75         RX_MGMT_CFG80211_ASSOC_ERROR,
  76 };
  77
  78 /* utils */
  79 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  80 {
  81         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  82 }
  83
  84 /*
  85  * We can have multiple work items (and connection probing)
  86  * scheduling this timer, but we need to take care to only
  87  * reschedule it when it should fire _earlier_ than it was
  88  * asked for before, or if it's not pending right now. This
  89  * function ensures that. Note that it then is required to
  90  * run this function for all timeouts after the first one
  91  * has happened -- the work that runs from this timer will
  92  * do that.
  93  */
  94 static void run_again(struct ieee80211_if_managed *ifmgd,
  95                              unsigned long timeout)
  96 {
  97         ASSERT_MGD_MTX(ifmgd);
  98
  99         if (!timer_pending(&ifmgd->timer) ||
 100             time_before(timeout, ifmgd->timer.expires))
 101                 mod_timer(&ifmgd->timer, timeout);
 102 }
 103
 104 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 105 {
 106         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 107                 return;
 108
 109         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 110                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 111 }
 112
 113 static int ecw2cw(int ecw)
 114 {
 115         return (1 << ecw) - 1;
 116 }
 117
 118 /*
 119  * ieee80211_enable_ht should be called only after the operating band
 120  * has been determined as ht configuration depends on the hw's
 121  * HT abilities for a specific band.
 122  */
 123 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 124                                struct ieee80211_ht_info *hti,
 125                                const u8 *bssid, u16 ap_ht_cap_flags)
 126 {
 127         struct ieee80211_local *local = sdata->local;
 128         struct ieee80211_supported_band *sband;
 129         struct sta_info *sta;
 130         u32 changed = 0;
 131         u16 ht_opmode;
 132         bool enable_ht = true, ht_changed;
 133         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 134
 135         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 136
 137         /* HT is not supported */
 138         if (!sband->ht_cap.ht_supported)
 139                 enable_ht = false;
 140
 141         /* check that channel matches the right operating channel */
 142         if (local->hw.conf.channel->center_freq !=
 143             ieee80211_channel_to_frequency(hti->control_chan))
 144                 enable_ht = false;
 145
 146         if (enable_ht) {
 147                 channel_type = NL80211_CHAN_HT20;
 148
 149                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 150                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 151                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 152                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 153                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 154                                 if (!(local->hw.conf.channel->flags &
 155                                     IEEE80211_CHAN_NO_HT40PLUS))
 156                                         channel_type = NL80211_CHAN_HT40PLUS;
 157                                 break;
 158                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 159                                 if (!(local->hw.conf.channel->flags &
 160                                     IEEE80211_CHAN_NO_HT40MINUS))
 161                                         channel_type = NL80211_CHAN_HT40MINUS;
 162                                 break;
 163                         }
 164                 }
 165         }
 166
 167         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 168                      channel_type != local->hw.conf.channel_type;
 169
 170         local->oper_channel_type = channel_type;
 171
 172         if (ht_changed) {
 173                 /* channel_type change automatically detected */
 174                 ieee80211_hw_config(local, 0);
 175
 176                 rcu_read_lock();
 177                 sta = sta_info_get(sdata, bssid);
 178                 if (sta)
 179                         rate_control_rate_update(local, sband, sta,
 180                                                  IEEE80211_RC_HT_CHANGED);
 181                 rcu_read_unlock();
 182         }
 183
 184         /* disable HT */
 185         if (!enable_ht)
 186                 return 0;
 187
 188         ht_opmode = le16_to_cpu(hti->operation_mode);
 189
 190         /* if bss configuration changed store the new one */
 191         if (!sdata->ht_opmode_valid ||
 192             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 193                 changed |= BSS_CHANGED_HT;
 194                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 195                 sdata->ht_opmode_valid = true;
 196         }
 197
 198         return changed;
 199 }
 200
 201 /* frame sending functions */
 202
 203 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 204                                            const u8 *bssid, u16 stype, u16 reason,
 205                                            void *cookie)
 206 {
 207         struct ieee80211_local *local = sdata->local;
 208         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 209         struct sk_buff *skb;
 210         struct ieee80211_mgmt *mgmt;
 211
 212         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 213         if (!skb) {
 214                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 215                        "deauth/disassoc frame\n", sdata->name);
 216                 return;
 217         }
 218         skb_reserve(skb, local->hw.extra_tx_headroom);
 219
 220         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 221         memset(mgmt, 0, 24);
 222         memcpy(mgmt->da, bssid, ETH_ALEN);
 223         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 224         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 225         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 226         skb_put(skb, 2);
 227         /* u.deauth.reason_code == u.disassoc.reason_code */
 228         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 229
 230         if (stype == IEEE80211_STYPE_DEAUTH)
 231                 if (cookie)
 232                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 233                 else
 234                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 235         else
 236                 if (cookie)
 237                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 238                 else
 239                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 240         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 241                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 242         ieee80211_tx_skb(sdata, skb);
 243 }
 244
 245 void ieee80211_send_pspoll(struct ieee80211_local *local,
 246                            struct ieee80211_sub_if_data *sdata)
 247 {
 248         struct ieee80211_pspoll *pspoll;
 249         struct sk_buff *skb;
 250
 251         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 252         if (!skb)
 253                 return;
 254
 255         pspoll = (struct ieee80211_pspoll *) skb->data;
 256         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 257
 258         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 259         ieee80211_tx_skb(sdata, skb);
 260 }
 261
 262 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 263                              struct ieee80211_sub_if_data *sdata,
 264                              int powersave)
 265 {
 266         struct sk_buff *skb;
 267         struct ieee80211_hdr_3addr *nullfunc;
 268
 269         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 270         if (!skb)
 271                 return;
 272
 273         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 274         if (powersave)
 275                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 276
 277         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 278         ieee80211_tx_skb(sdata, skb);
 279 }
 280
 281 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 282                                           struct ieee80211_sub_if_data *sdata)
 283 {
 284         struct sk_buff *skb;
 285         struct ieee80211_hdr *nullfunc;
 286         __le16 fc;
 287
 288         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 289                 return;
 290
 291         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 292         if (!skb) {
 293                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 294                        "nullfunc frame\n", sdata->name);
 295                 return;
 296         }
 297         skb_reserve(skb, local->hw.extra_tx_headroom);
 298
 299         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 300         memset(nullfunc, 0, 30);
 301         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 302                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 303         nullfunc->frame_control = fc;
 304         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 305         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 306         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 307         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 308
 309         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 310         ieee80211_tx_skb(sdata, skb);
 311 }
 312
 313 /* spectrum management related things */
 314 static void ieee80211_chswitch_work(struct work_struct *work)
 315 {
 316         struct ieee80211_sub_if_data *sdata =
 317                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 318         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 319
 320         if (!ieee80211_sdata_running(sdata))
 321                 return;
 322
 323         mutex_lock(&ifmgd->mtx);
 324         if (!ifmgd->associated)
 325                 goto out;
 326
 327         sdata->local->oper_channel = sdata->local->csa_channel;
 328         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
 329
 330         /* XXX: shouldn't really modify cfg80211-owned data! */
 331         ifmgd->associated->channel = sdata->local->oper_channel;
 332
 333         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 334                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 335  out:
 336         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 337         mutex_unlock(&ifmgd->mtx);
 338 }
 339
 340 static void ieee80211_chswitch_timer(unsigned long data)
 341 {
 342         struct ieee80211_sub_if_data *sdata =
 343                 (struct ieee80211_sub_if_data *) data;
 344         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 345
 346         if (sdata->local->quiescing) {
 347                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 348                 return;
 349         }
 350
 351         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 352 }
 353
 354 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 355                                       struct ieee80211_channel_sw_ie *sw_elem,
 356                                       struct ieee80211_bss *bss)
 357 {
 358         struct cfg80211_bss *cbss =
 359                 container_of((void *)bss, struct cfg80211_bss, priv);
 360         struct ieee80211_channel *new_ch;
 361         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 362         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 363
 364         ASSERT_MGD_MTX(ifmgd);
 365
 366         if (!ifmgd->associated)
 367                 return;
 368
 369         if (sdata->local->scanning)
 370                 return;
 371
 372         /* Disregard subsequent beacons if we are already running a timer
 373            processing a CSA */
 374
 375         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 376                 return;
 377
 378         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 379         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 380                 return;
 381
 382         sdata->local->csa_channel = new_ch;
 383
 384         if (sw_elem->count <= 1) {
 385                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 386         } else {
 387                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 388                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 389                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 390                 mod_timer(&ifmgd->chswitch_timer,
 391                           jiffies +
 392                           msecs_to_jiffies(sw_elem->count *
 393                                            cbss->beacon_interval));
 394         }
 395 }
 396
 397 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 398                                         u16 capab_info, u8 *pwr_constr_elem,
 399                                         u8 pwr_constr_elem_len)
 400 {
 401         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 402
 403         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 404                 return;
 405
 406         /* Power constraint IE length should be 1 octet */
 407         if (pwr_constr_elem_len != 1)
 408                 return;
 409
 410         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 411             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 412                 sdata->local->power_constr_level = *pwr_constr_elem;
 413                 ieee80211_hw_config(sdata->local, 0);
 414         }
 415 }
 416
 417 /* powersave */
 418 static void ieee80211_enable_ps(struct ieee80211_local *local,
 419                                 struct ieee80211_sub_if_data *sdata)
 420 {
 421         struct ieee80211_conf *conf = &local->hw.conf;
 422
 423         /*
 424          * If we are scanning right now then the parameters will
 425          * take effect when scan finishes.
 426          */
 427         if (local->scanning)
 428                 return;
 429
 430         if (conf->dynamic_ps_timeout > 0 &&
 431             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 432                 mod_timer(&local->dynamic_ps_timer, jiffies +
 433                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 434         } else {
 435                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 436                         ieee80211_send_nullfunc(local, sdata, 1);
 437                 conf->flags |= IEEE80211_CONF_PS;
 438                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 439         }
 440 }
 441
 442 static void ieee80211_change_ps(struct ieee80211_local *local)
 443 {
 444         struct ieee80211_conf *conf = &local->hw.conf;
 445
 446         if (local->ps_sdata) {
 447                 ieee80211_enable_ps(local, local->ps_sdata);
 448         } else if (conf->flags & IEEE80211_CONF_PS) {
 449                 conf->flags &= ~IEEE80211_CONF_PS;
 450                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 451                 del_timer_sync(&local->dynamic_ps_timer);
 452                 cancel_work_sync(&local->dynamic_ps_enable_work);
 453         }
 454 }
 455
 456 /* need to hold RTNL or interface lock */
 457 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 458 {
 459         struct ieee80211_sub_if_data *sdata, *found = NULL;
 460         int count = 0;
 461
 462         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 463                 local->ps_sdata = NULL;
 464                 return;
 465         }
 466
 467         if (!list_empty(&local->work_list)) {
 468                 local->ps_sdata = NULL;
 469                 goto change;
 470         }
 471
 472         list_for_each_entry(sdata, &local->interfaces, list) {
 473                 if (!ieee80211_sdata_running(sdata))
 474                         continue;
 475                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 476                         continue;
 477                 found = sdata;
 478                 count++;
 479         }
 480
 481         if (count == 1 && found->u.mgd.powersave &&
 482             found->u.mgd.associated &&
 483             found->u.mgd.associated->beacon_ies &&
 484             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 485                                     IEEE80211_STA_CONNECTION_POLL))) {
 486                 s32 beaconint_us;
 487
 488                 if (latency < 0)
 489                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 490
 491                 beaconint_us = ieee80211_tu_to_usec(
 492                                         found->vif.bss_conf.beacon_int);
 493
 494                 if (beaconint_us > latency) {
 495                         local->ps_sdata = NULL;
 496                 } else {
 497                         struct ieee80211_bss *bss;
 498                         int maxslp = 1;
 499                         u8 dtimper;
 500
 501                         bss = (void *)found->u.mgd.associated->priv;
 502                         dtimper = bss->dtim_period;
 503
 504                         /* If the TIM IE is invalid, pretend the value is 1 */
 505                         if (!dtimper)
 506                                 dtimper = 1;
 507                         else if (dtimper > 1)
 508                                 maxslp = min_t(int, dtimper,
 509                                                     latency / beaconint_us);
 510
 511                         local->hw.conf.max_sleep_period = maxslp;
 512                         local->hw.conf.ps_dtim_period = dtimper;
 513                         local->ps_sdata = found;
 514                 }
 515         } else {
 516                 local->ps_sdata = NULL;
 517         }
 518
 519  change:
 520         ieee80211_change_ps(local);
 521 }
 522
 523 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 524 {
 525         struct ieee80211_local *local =
 526                 container_of(work, struct ieee80211_local,
 527                              dynamic_ps_disable_work);
 528
 529         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 530                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 531                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 532         }
 533
 534         ieee80211_wake_queues_by_reason(&local->hw,
 535                                         IEEE80211_QUEUE_STOP_REASON_PS);
 536 }
 537
 538 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 539 {
 540         struct ieee80211_local *local =
 541                 container_of(work, struct ieee80211_local,
 542                              dynamic_ps_enable_work);
 543         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 544
 545         /* can only happen when PS was just disabled anyway */
 546         if (!sdata)
 547                 return;
 548
 549         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 550                 return;
 551
 552         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 553                 ieee80211_send_nullfunc(local, sdata, 1);
 554
 555         local->hw.conf.flags |= IEEE80211_CONF_PS;
 556         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 557 }
 558
 559 void ieee80211_dynamic_ps_timer(unsigned long data)
 560 {
 561         struct ieee80211_local *local = (void *) data;
 562
 563         if (local->quiescing || local->suspended)
 564                 return;
 565
 566         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 567 }
 568
 569 /* MLME */
 570 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 571                                      struct ieee80211_if_managed *ifmgd,
 572                                      u8 *wmm_param, size_t wmm_param_len)
 573 {
 574         struct ieee80211_tx_queue_params params;
 575         size_t left;
 576         int count;
 577         u8 *pos, uapsd_queues = 0;
 578
 579         if (local->hw.queues < 4)
 580                 return;
 581
 582         if (!wmm_param)
 583                 return;
 584
 585         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 586                 return;
 587
 588         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 589                 uapsd_queues = local->uapsd_queues;
 590
 591         count = wmm_param[6] & 0x0f;
 592         if (count == ifmgd->wmm_last_param_set)
 593                 return;
 594         ifmgd->wmm_last_param_set = count;
 595
 596         pos = wmm_param + 8;
 597         left = wmm_param_len - 8;
 598
 599         memset(&params, 0, sizeof(params));
 600
 601         local->wmm_acm = 0;
 602         for (; left >= 4; left -= 4, pos += 4) {
 603                 int aci = (pos[0] >> 5) & 0x03;
 604                 int acm = (pos[0] >> 4) & 0x01;
 605                 bool uapsd = false;
 606                 int queue;
 607
 608                 switch (aci) {
 609                 case 1: /* AC_BK */
 610                         queue = 3;
 611                         if (acm)
 612                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 613                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 614                                 uapsd = true;
 615                         break;
 616                 case 2: /* AC_VI */
 617                         queue = 1;
 618                         if (acm)
 619                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 620                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 621                                 uapsd = true;
 622                         break;
 623                 case 3: /* AC_VO */
 624                         queue = 0;
 625                         if (acm)
 626                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 627                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 628                                 uapsd = true;
 629                         break;
 630                 case 0: /* AC_BE */
 631                 default:
 632                         queue = 2;
 633                         if (acm)
 634                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 635                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 636                                 uapsd = true;
 637                         break;
 638                 }
 639
 640                 params.aifs = pos[0] & 0x0f;
 641                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 642                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 643                 params.txop = get_unaligned_le16(pos + 2);
 644                 params.uapsd = uapsd;
 645
 646 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 647                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 648                        "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 649                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 650                        params.aifs, params.cw_min, params.cw_max, params.txop,
 651                        params.uapsd);
 652 #endif
 653                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
 654                         printk(KERN_DEBUG "%s: failed to set TX queue "
 655                                "parameters for queue %d\n",
 656                                wiphy_name(local->hw.wiphy), queue);
 657         }
 658 }
 659
 660 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 661                                            u16 capab, bool erp_valid, u8 erp)
 662 {
 663         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 664         u32 changed = 0;
 665         bool use_protection;
 666         bool use_short_preamble;
 667         bool use_short_slot;
 668
 669         if (erp_valid) {
 670                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 671                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 672         } else {
 673                 use_protection = false;
 674                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 675         }
 676
 677         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 678         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 679                 use_short_slot = true;
 680
 681         if (use_protection != bss_conf->use_cts_prot) {
 682                 bss_conf->use_cts_prot = use_protection;
 683                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 684         }
 685
 686         if (use_short_preamble != bss_conf->use_short_preamble) {
 687                 bss_conf->use_short_preamble = use_short_preamble;
 688                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 689         }
 690
 691         if (use_short_slot != bss_conf->use_short_slot) {
 692                 bss_conf->use_short_slot = use_short_slot;
 693                 changed |= BSS_CHANGED_ERP_SLOT;
 694         }
 695
 696         return changed;
 697 }
 698
 699 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 700                                      struct cfg80211_bss *cbss,
 701                                      u32 bss_info_changed)
 702 {
 703         struct ieee80211_bss *bss = (void *)cbss->priv;
 704         struct ieee80211_local *local = sdata->local;
 705
 706         bss_info_changed |= BSS_CHANGED_ASSOC;
 707         /* set timing information */
 708         sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
 709         sdata->vif.bss_conf.timestamp = cbss->tsf;
 710
 711         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 712         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 713                 cbss->capability, bss->has_erp_value, bss->erp_value);
 714
 715         sdata->u.mgd.associated = cbss;
 716         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 717
 718         /* just to be sure */
 719         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 720                                 IEEE80211_STA_BEACON_POLL);
 721
 722         /*
 723          * Always handle WMM once after association regardless
 724          * of the first value the AP uses. Setting -1 here has
 725          * that effect because the AP values is an unsigned
 726          * 4-bit value.
 727          */
 728         sdata->u.mgd.wmm_last_param_set = -1;
 729
 730         ieee80211_led_assoc(local, 1);
 731
 732         sdata->vif.bss_conf.assoc = 1;
 733         /*
 734          * For now just always ask the driver to update the basic rateset
 735          * when we have associated, we aren't checking whether it actually
 736          * changed or not.
 737          */
 738         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 739
 740         /* And the BSSID changed - we're associated now */
 741         bss_info_changed |= BSS_CHANGED_BSSID;
 742
 743         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 744
 745         mutex_lock(&local->iflist_mtx);
 746         ieee80211_recalc_ps(local, -1);
 747         ieee80211_recalc_smps(local, sdata);
 748         mutex_unlock(&local->iflist_mtx);
 749
 750         netif_tx_start_all_queues(sdata->dev);
 751         netif_carrier_on(sdata->dev);
 752 }
 753
 754 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
 755 {
 756         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 757         struct ieee80211_local *local = sdata->local;
 758         struct sta_info *sta;
 759         u32 changed = 0, config_changed = 0;
 760         u8 bssid[ETH_ALEN];
 761
 762         ASSERT_MGD_MTX(ifmgd);
 763
 764         if (WARN_ON(!ifmgd->associated))
 765                 return;
 766
 767         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 768
 769         ifmgd->associated = NULL;
 770         memset(ifmgd->bssid, 0, ETH_ALEN);
 771
 772         /*
 773          * we need to commit the associated = NULL change because the
 774          * scan code uses that to determine whether this iface should
 775          * go to/wake up from powersave or not -- and could otherwise
 776          * wake the queues erroneously.
 777          */
 778         smp_mb();
 779
 780         /*
 781          * Thus, we can only afterwards stop the queues -- to account
 782          * for the case where another CPU is finishing a scan at this
 783          * time -- we don't want the scan code to enable queues.
 784          */
 785
 786         netif_tx_stop_all_queues(sdata->dev);
 787         netif_carrier_off(sdata->dev);
 788
 789         rcu_read_lock();
 790         sta = sta_info_get(sdata, bssid);
 791         if (sta)
 792                 ieee80211_sta_tear_down_BA_sessions(sta);
 793         rcu_read_unlock();
 794
 795         changed |= ieee80211_reset_erp_info(sdata);
 796
 797         ieee80211_led_assoc(local, 0);
 798         changed |= BSS_CHANGED_ASSOC;
 799         sdata->vif.bss_conf.assoc = false;
 800
 801         ieee80211_set_wmm_default(sdata);
 802
 803         /* channel(_type) changes are handled by ieee80211_hw_config */
 804         local->oper_channel_type = NL80211_CHAN_NO_HT;
 805
 806         /* on the next assoc, re-program HT parameters */
 807         sdata->ht_opmode_valid = false;
 808
 809         local->power_constr_level = 0;
 810
 811         del_timer_sync(&local->dynamic_ps_timer);
 812         cancel_work_sync(&local->dynamic_ps_enable_work);
 813
 814         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 815                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 816                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 817         }
 818
 819         ieee80211_hw_config(local, config_changed);
 820
 821         /* And the BSSID changed -- not very interesting here */
 822         changed |= BSS_CHANGED_BSSID;
 823         ieee80211_bss_info_change_notify(sdata, changed);
 824
 825         sta_info_destroy_addr(sdata, bssid);
 826 }
 827
 828 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 829                              struct ieee80211_hdr *hdr)
 830 {
 831         /*
 832          * We can postpone the mgd.timer whenever receiving unicast frames
 833          * from AP because we know that the connection is working both ways
 834          * at that time. But multicast frames (and hence also beacons) must
 835          * be ignored here, because we need to trigger the timer during
 836          * data idle periods for sending the periodic probe request to the
 837          * AP we're connected to.
 838          */
 839         if (is_multicast_ether_addr(hdr->addr1))
 840                 return;
 841
 842         mod_timer(&sdata->u.mgd.conn_mon_timer,
 843                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 844 }
 845
 846 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
 847 {
 848         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 849         const u8 *ssid;
 850
 851         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
 852         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
 853                                  ssid + 2, ssid[1], NULL, 0);
 854
 855         ifmgd->probe_send_count++;
 856         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
 857         run_again(ifmgd, ifmgd->probe_timeout);
 858 }
 859
 860 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
 861                                    bool beacon)
 862 {
 863         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 864         bool already = false;
 865
 866         if (!ieee80211_sdata_running(sdata))
 867                 return;
 868
 869         if (sdata->local->scanning)
 870                 return;
 871
 872         if (sdata->local->tmp_channel)
 873                 return;
 874
 875         mutex_lock(&ifmgd->mtx);
 876
 877         if (!ifmgd->associated)
 878                 goto out;
 879
 880 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 881         if (beacon && net_ratelimit())
 882                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
 883                        "- sending probe request\n", sdata->name);
 884 #endif
 885
 886         /*
 887          * The driver/our work has already reported this event or the
 888          * connection monitoring has kicked in and we have already sent
 889          * a probe request. Or maybe the AP died and the driver keeps
 890          * reporting until we disassociate...
 891          *
 892          * In either case we have to ignore the current call to this
 893          * function (except for setting the correct probe reason bit)
 894          * because otherwise we would reset the timer every time and
 895          * never check whether we received a probe response!
 896          */
 897         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 898                             IEEE80211_STA_CONNECTION_POLL))
 899                 already = true;
 900
 901         if (beacon)
 902                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
 903         else
 904                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
 905
 906         if (already)
 907                 goto out;
 908
 909         mutex_lock(&sdata->local->iflist_mtx);
 910         ieee80211_recalc_ps(sdata->local, -1);
 911         mutex_unlock(&sdata->local->iflist_mtx);
 912
 913         ifmgd->probe_send_count = 0;
 914         ieee80211_mgd_probe_ap_send(sdata);
 915  out:
 916         mutex_unlock(&ifmgd->mtx);
 917 }
 918
 919 void ieee80211_beacon_loss_work(struct work_struct *work)
 920 {
 921         struct ieee80211_sub_if_data *sdata =
 922                 container_of(work, struct ieee80211_sub_if_data,
 923                              u.mgd.beacon_loss_work);
 924
 925         ieee80211_mgd_probe_ap(sdata, true);
 926 }
 927
 928 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
 929 {
 930         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 931
 932         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
 933 }
 934 EXPORT_SYMBOL(ieee80211_beacon_loss);
 935
 936 static enum rx_mgmt_action __must_check
 937 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
 938                          struct ieee80211_mgmt *mgmt, size_t len)
 939 {
 940         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 941         const u8 *bssid = NULL;
 942         u16 reason_code;
 943
 944         if (len < 24 + 2)
 945                 return RX_MGMT_NONE;
 946
 947         ASSERT_MGD_MTX(ifmgd);
 948
 949         bssid = ifmgd->associated->bssid;
 950
 951         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
 952
 953         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
 954                         sdata->name, bssid, reason_code);
 955
 956         ieee80211_set_disassoc(sdata);
 957         ieee80211_recalc_idle(sdata->local);
 958
 959         return RX_MGMT_CFG80211_DEAUTH;
 960 }
 961
 962
 963 static enum rx_mgmt_action __must_check
 964 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
 965                            struct ieee80211_mgmt *mgmt, size_t len)
 966 {
 967         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 968         u16 reason_code;
 969
 970         if (len < 24 + 2)
 971                 return RX_MGMT_NONE;
 972
 973         ASSERT_MGD_MTX(ifmgd);
 974
 975         if (WARN_ON(!ifmgd->associated))
 976                 return RX_MGMT_NONE;
 977
 978         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
 979                 return RX_MGMT_NONE;
 980
 981         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
 982
 983         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
 984                         sdata->name, mgmt->sa, reason_code);
 985
 986         ieee80211_set_disassoc(sdata);
 987         ieee80211_recalc_idle(sdata->local);
 988         return RX_MGMT_CFG80211_DISASSOC;
 989 }
 990
 991
 992 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
 993                                     struct ieee80211_mgmt *mgmt, size_t len)
 994 {
 995         struct ieee80211_sub_if_data *sdata = wk->sdata;
 996         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 997         struct ieee80211_local *local = sdata->local;
 998         struct ieee80211_supported_band *sband;
 999         struct sta_info *sta;
1000         struct cfg80211_bss *cbss = wk->assoc.bss;
1001         u8 *pos;
1002         u32 rates, basic_rates;
1003         u16 capab_info, aid;
1004         struct ieee802_11_elems elems;
1005         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1006         u32 changed = 0;
1007         int i, j, err;
1008         bool have_higher_than_11mbit = false;
1009         u16 ap_ht_cap_flags;
1010
1011         /* AssocResp and ReassocResp have identical structure */
1012
1013         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1014         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1015
1016         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1017                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1018                        "set\n", sdata->name, aid);
1019         aid &= ~(BIT(15) | BIT(14));
1020
1021         pos = mgmt->u.assoc_resp.variable;
1022         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1023
1024         if (!elems.supp_rates) {
1025                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1026                        sdata->name);
1027                 return false;
1028         }
1029
1030         ifmgd->aid = aid;
1031
1032         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1033         if (!sta) {
1034                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1035                        " the AP\n", sdata->name);
1036                 return false;
1037         }
1038
1039         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1040                            WLAN_STA_ASSOC_AP);
1041         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1042                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1043
1044         rates = 0;
1045         basic_rates = 0;
1046         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1047
1048         for (i = 0; i < elems.supp_rates_len; i++) {
1049                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1050                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1051
1052                 if (rate > 110)
1053                         have_higher_than_11mbit = true;
1054
1055                 for (j = 0; j < sband->n_bitrates; j++) {
1056                         if (sband->bitrates[j].bitrate == rate) {
1057                                 rates |= BIT(j);
1058                                 if (is_basic)
1059                                         basic_rates |= BIT(j);
1060                                 break;
1061                         }
1062                 }
1063         }
1064
1065         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1066                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1067                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1068
1069                 if (rate > 110)
1070                         have_higher_than_11mbit = true;
1071
1072                 for (j = 0; j < sband->n_bitrates; j++) {
1073                         if (sband->bitrates[j].bitrate == rate) {
1074                                 rates |= BIT(j);
1075                                 if (is_basic)
1076                                         basic_rates |= BIT(j);
1077                                 break;
1078                         }
1079                 }
1080         }
1081
1082         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1083         sdata->vif.bss_conf.basic_rates = basic_rates;
1084
1085         /* cf. IEEE 802.11 9.2.12 */
1086         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1087             have_higher_than_11mbit)
1088                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1089         else
1090                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1091
1092         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1093                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1094                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1095
1096         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1097
1098         rate_control_rate_init(sta);
1099
1100         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1101                 set_sta_flags(sta, WLAN_STA_MFP);
1102
1103         if (elems.wmm_param)
1104                 set_sta_flags(sta, WLAN_STA_WME);
1105
1106         err = sta_info_insert(sta);
1107         sta = NULL;
1108         if (err) {
1109                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1110                        " the AP (error %d)\n", sdata->name, err);
1111                 return false;
1112         }
1113
1114         if (elems.wmm_param)
1115                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1116                                          elems.wmm_param_len);
1117         else
1118                 ieee80211_set_wmm_default(sdata);
1119
1120         local->oper_channel = wk->chan;
1121
1122         if (elems.ht_info_elem && elems.wmm_param &&
1123             (sdata->local->hw.queues >= 4) &&
1124             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1125                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1126                                                cbss->bssid, ap_ht_cap_flags);
1127
1128         /* set AID and assoc capability,
1129          * ieee80211_set_associated() will tell the driver */
1130         bss_conf->aid = aid;
1131         bss_conf->assoc_capability = capab_info;
1132         ieee80211_set_associated(sdata, cbss, changed);
1133
1134         /*
1135          * If we're using 4-addr mode, let the AP know that we're
1136          * doing so, so that it can create the STA VLAN on its side
1137          */
1138         if (ifmgd->use_4addr)
1139                 ieee80211_send_4addr_nullfunc(local, sdata);
1140
1141         /*
1142          * Start timer to probe the connection to the AP now.
1143          * Also start the timer that will detect beacon loss.
1144          */
1145         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1146         mod_beacon_timer(sdata);
1147
1148         return true;
1149 }
1150
1151
1152 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1153                                   struct ieee80211_mgmt *mgmt,
1154                                   size_t len,
1155                                   struct ieee80211_rx_status *rx_status,
1156                                   struct ieee802_11_elems *elems,
1157                                   bool beacon)
1158 {
1159         struct ieee80211_local *local = sdata->local;
1160         int freq;
1161         struct ieee80211_bss *bss;
1162         struct ieee80211_channel *channel;
1163         bool need_ps = false;
1164
1165         if (sdata->u.mgd.associated) {
1166                 bss = (void *)sdata->u.mgd.associated->priv;
1167                 /* not previously set so we may need to recalc */
1168                 need_ps = !bss->dtim_period;
1169         }
1170
1171         if (elems->ds_params && elems->ds_params_len == 1)
1172                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1173         else
1174                 freq = rx_status->freq;
1175
1176         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1177
1178         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1179                 return;
1180
1181         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1182                                         channel, beacon);
1183         if (bss)
1184                 ieee80211_rx_bss_put(local, bss);
1185
1186         if (!sdata->u.mgd.associated)
1187                 return;
1188
1189         if (need_ps) {
1190                 mutex_lock(&local->iflist_mtx);
1191                 ieee80211_recalc_ps(local, -1);
1192                 mutex_unlock(&local->iflist_mtx);
1193         }
1194
1195         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1196             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1197                                                         ETH_ALEN) == 0)) {
1198                 struct ieee80211_channel_sw_ie *sw_elem =
1199                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1200                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1201         }
1202 }
1203
1204
1205 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1206                                          struct sk_buff *skb)
1207 {
1208         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1209         struct ieee80211_if_managed *ifmgd;
1210         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1211         size_t baselen, len = skb->len;
1212         struct ieee802_11_elems elems;
1213
1214         ifmgd = &sdata->u.mgd;
1215
1216         ASSERT_MGD_MTX(ifmgd);
1217
1218         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1219                 return; /* ignore ProbeResp to foreign address */
1220
1221         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1222         if (baselen > len)
1223                 return;
1224
1225         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1226                                 &elems);
1227
1228         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1229
1230         if (ifmgd->associated &&
1231             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1232             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1233                             IEEE80211_STA_CONNECTION_POLL)) {
1234                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1235                                   IEEE80211_STA_BEACON_POLL);
1236                 mutex_lock(&sdata->local->iflist_mtx);
1237                 ieee80211_recalc_ps(sdata->local, -1);
1238                 mutex_unlock(&sdata->local->iflist_mtx);
1239                 /*
1240                  * We've received a probe response, but are not sure whether
1241                  * we have or will be receiving any beacons or data, so let's
1242                  * schedule the timers again, just in case.
1243                  */
1244                 mod_beacon_timer(sdata);
1245                 mod_timer(&ifmgd->conn_mon_timer,
1246                           round_jiffies_up(jiffies +
1247                                            IEEE80211_CONNECTION_IDLE_TIME));
1248         }
1249 }
1250
1251 /*
1252  * This is the canonical list of information elements we care about,
1253  * the filter code also gives us all changes to the Microsoft OUI
1254  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1255  *
1256  * We implement beacon filtering in software since that means we can
1257  * avoid processing the frame here and in cfg80211, and userspace
1258  * will not be able to tell whether the hardware supports it or not.
1259  *
1260  * XXX: This list needs to be dynamic -- userspace needs to be able to
1261  *      add items it requires. It also needs to be able to tell us to
1262  *      look out for other vendor IEs.
1263  */
1264 static const u64 care_about_ies =
1265         (1ULL << WLAN_EID_COUNTRY) |
1266         (1ULL << WLAN_EID_ERP_INFO) |
1267         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1268         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1269         (1ULL << WLAN_EID_HT_CAPABILITY) |
1270         (1ULL << WLAN_EID_HT_INFORMATION);
1271
1272 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1273                                      struct ieee80211_mgmt *mgmt,
1274                                      size_t len,
1275                                      struct ieee80211_rx_status *rx_status)
1276 {
1277         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1278         size_t baselen;
1279         struct ieee802_11_elems elems;
1280         struct ieee80211_local *local = sdata->local;
1281         u32 changed = 0;
1282         bool erp_valid, directed_tim = false;
1283         u8 erp_value = 0;
1284         u32 ncrc;
1285         u8 *bssid;
1286
1287         ASSERT_MGD_MTX(ifmgd);
1288
1289         /* Process beacon from the current BSS */
1290         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1291         if (baselen > len)
1292                 return;
1293
1294         if (rx_status->freq != local->hw.conf.channel->center_freq)
1295                 return;
1296
1297         /*
1298          * We might have received a number of frames, among them a
1299          * disassoc frame and a beacon...
1300          */
1301         if (!ifmgd->associated)
1302                 return;
1303
1304         bssid = ifmgd->associated->bssid;
1305
1306         /*
1307          * And in theory even frames from a different AP we were just
1308          * associated to a split-second ago!
1309          */
1310         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1311                 return;
1312
1313         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1314 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1315                 if (net_ratelimit()) {
1316                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1317                                "to a received beacon\n", sdata->name);
1318                 }
1319 #endif
1320                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1321                 mutex_lock(&local->iflist_mtx);
1322                 ieee80211_recalc_ps(local, -1);
1323                 mutex_unlock(&local->iflist_mtx);
1324         }
1325
1326         /*
1327          * Push the beacon loss detection into the future since
1328          * we are processing a beacon from the AP just now.
1329          */
1330         mod_beacon_timer(sdata);
1331
1332         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1333         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1334                                           len - baselen, &elems,
1335                                           care_about_ies, ncrc);
1336
1337         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1338                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1339                                                    ifmgd->aid);
1340
1341         if (ncrc != ifmgd->beacon_crc) {
1342                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1343                                       true);
1344
1345                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1346                                          elems.wmm_param_len);
1347         }
1348
1349         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1350                 if (directed_tim) {
1351                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1352                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1353                                 ieee80211_hw_config(local,
1354                                                     IEEE80211_CONF_CHANGE_PS);
1355                                 ieee80211_send_nullfunc(local, sdata, 0);
1356                         } else {
1357                                 local->pspolling = true;
1358
1359                                 /*
1360                                  * Here is assumed that the driver will be
1361                                  * able to send ps-poll frame and receive a
1362                                  * response even though power save mode is
1363                                  * enabled, but some drivers might require
1364                                  * to disable power save here. This needs
1365                                  * to be investigated.
1366                                  */
1367                                 ieee80211_send_pspoll(local, sdata);
1368                         }
1369                 }
1370         }
1371
1372         if (ncrc == ifmgd->beacon_crc)
1373                 return;
1374         ifmgd->beacon_crc = ncrc;
1375
1376         if (elems.erp_info && elems.erp_info_len >= 1) {
1377                 erp_valid = true;
1378                 erp_value = elems.erp_info[0];
1379         } else {
1380                 erp_valid = false;
1381         }
1382         changed |= ieee80211_handle_bss_capability(sdata,
1383                         le16_to_cpu(mgmt->u.beacon.capab_info),
1384                         erp_valid, erp_value);
1385
1386
1387         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1388             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1389                 struct sta_info *sta;
1390                 struct ieee80211_supported_band *sband;
1391                 u16 ap_ht_cap_flags;
1392
1393                 rcu_read_lock();
1394
1395                 sta = sta_info_get(sdata, bssid);
1396                 if (WARN_ON(!sta)) {
1397                         rcu_read_unlock();
1398                         return;
1399                 }
1400
1401                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1402
1403                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1404                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1405
1406                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1407
1408                 rcu_read_unlock();
1409
1410                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1411                                                bssid, ap_ht_cap_flags);
1412         }
1413
1414         /* Note: country IE parsing is done for us by cfg80211 */
1415         if (elems.country_elem) {
1416                 /* TODO: IBSS also needs this */
1417                 if (elems.pwr_constr_elem)
1418                         ieee80211_handle_pwr_constr(sdata,
1419                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1420                                 elems.pwr_constr_elem,
1421                                 elems.pwr_constr_elem_len);
1422         }
1423
1424         ieee80211_bss_info_change_notify(sdata, changed);
1425 }
1426
1427 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1428                                           struct sk_buff *skb)
1429 {
1430         struct ieee80211_local *local = sdata->local;
1431         struct ieee80211_mgmt *mgmt;
1432         u16 fc;
1433
1434         if (skb->len < 24)
1435                 return RX_DROP_MONITOR;
1436
1437         mgmt = (struct ieee80211_mgmt *) skb->data;
1438         fc = le16_to_cpu(mgmt->frame_control);
1439
1440         switch (fc & IEEE80211_FCTL_STYPE) {
1441         case IEEE80211_STYPE_PROBE_RESP:
1442         case IEEE80211_STYPE_BEACON:
1443         case IEEE80211_STYPE_DEAUTH:
1444         case IEEE80211_STYPE_DISASSOC:
1445         case IEEE80211_STYPE_ACTION:
1446                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1447                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1448                 return RX_QUEUED;
1449         }
1450
1451         return RX_DROP_MONITOR;
1452 }
1453
1454 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1455                                          struct sk_buff *skb)
1456 {
1457         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1458         struct ieee80211_rx_status *rx_status;
1459         struct ieee80211_mgmt *mgmt;
1460         enum rx_mgmt_action rma = RX_MGMT_NONE;
1461         u16 fc;
1462
1463         rx_status = (struct ieee80211_rx_status *) skb->cb;
1464         mgmt = (struct ieee80211_mgmt *) skb->data;
1465         fc = le16_to_cpu(mgmt->frame_control);
1466
1467         mutex_lock(&ifmgd->mtx);
1468
1469         if (ifmgd->associated &&
1470             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1471                 switch (fc & IEEE80211_FCTL_STYPE) {
1472                 case IEEE80211_STYPE_BEACON:
1473                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1474                                                  rx_status);
1475                         break;
1476                 case IEEE80211_STYPE_PROBE_RESP:
1477                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1478                         break;
1479                 case IEEE80211_STYPE_DEAUTH:
1480                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1481                         break;
1482                 case IEEE80211_STYPE_DISASSOC:
1483                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1484                         break;
1485                 case IEEE80211_STYPE_ACTION:
1486                         if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1487                                 break;
1488
1489                         ieee80211_sta_process_chanswitch(sdata,
1490                                         &mgmt->u.action.u.chan_switch.sw_elem,
1491                                         (void *)ifmgd->associated->priv);
1492                         break;
1493                 }
1494                 mutex_unlock(&ifmgd->mtx);
1495
1496                 switch (rma) {
1497                 case RX_MGMT_NONE:
1498                         /* no action */
1499                         break;
1500                 case RX_MGMT_CFG80211_DEAUTH:
1501                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1502                         break;
1503                 case RX_MGMT_CFG80211_DISASSOC:
1504                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1505                         break;
1506                 default:
1507                         WARN(1, "unexpected: %d", rma);
1508                 }
1509                 goto out;
1510         }
1511
1512         mutex_unlock(&ifmgd->mtx);
1513
1514         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1515             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1516                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1517
1518  out:
1519         kfree_skb(skb);
1520 }
1521
1522 static void ieee80211_sta_timer(unsigned long data)
1523 {
1524         struct ieee80211_sub_if_data *sdata =
1525                 (struct ieee80211_sub_if_data *) data;
1526         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1527         struct ieee80211_local *local = sdata->local;
1528
1529         if (local->quiescing) {
1530                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1531                 return;
1532         }
1533
1534         ieee80211_queue_work(&local->hw, &ifmgd->work);
1535 }
1536
1537 static void ieee80211_sta_work(struct work_struct *work)
1538 {
1539         struct ieee80211_sub_if_data *sdata =
1540                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1541         struct ieee80211_local *local = sdata->local;
1542         struct ieee80211_if_managed *ifmgd;
1543         struct sk_buff *skb;
1544
1545         if (!ieee80211_sdata_running(sdata))
1546                 return;
1547
1548         if (local->scanning)
1549                 return;
1550
1551         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1552                 return;
1553
1554         /*
1555          * ieee80211_queue_work() should have picked up most cases,
1556          * here we'll pick the the rest.
1557          */
1558         if (WARN(local->suspended, "STA MLME work scheduled while "
1559                  "going to suspend\n"))
1560                 return;
1561
1562         ifmgd = &sdata->u.mgd;
1563
1564         /* first process frames to avoid timing out while a frame is pending */
1565         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1566                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1567
1568         /* then process the rest of the work */
1569         mutex_lock(&ifmgd->mtx);
1570
1571         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1572                             IEEE80211_STA_CONNECTION_POLL) &&
1573             ifmgd->associated) {
1574                 u8 bssid[ETH_ALEN];
1575
1576                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1577                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1578                         run_again(ifmgd, ifmgd->probe_timeout);
1579
1580                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1581 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1582                         printk(KERN_DEBUG "No probe response from AP %pM"
1583                                 " after %dms, try %d\n", bssid,
1584                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1585                                 ifmgd->probe_send_count);
1586 #endif
1587                         ieee80211_mgd_probe_ap_send(sdata);
1588                 } else {
1589                         /*
1590                          * We actually lost the connection ... or did we?
1591                          * Let's make sure!
1592                          */
1593                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1594                                           IEEE80211_STA_BEACON_POLL);
1595                         printk(KERN_DEBUG "No probe response from AP %pM"
1596                                 " after %dms, disconnecting.\n",
1597                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1598                         ieee80211_set_disassoc(sdata);
1599                         ieee80211_recalc_idle(local);
1600                         mutex_unlock(&ifmgd->mtx);
1601                         /*
1602                          * must be outside lock due to cfg80211,
1603                          * but that's not a problem.
1604                          */
1605                         ieee80211_send_deauth_disassoc(sdata, bssid,
1606                                         IEEE80211_STYPE_DEAUTH,
1607                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1608                                         NULL);
1609                         mutex_lock(&ifmgd->mtx);
1610                 }
1611         }
1612
1613         mutex_unlock(&ifmgd->mtx);
1614 }
1615
1616 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1617 {
1618         struct ieee80211_sub_if_data *sdata =
1619                 (struct ieee80211_sub_if_data *) data;
1620         struct ieee80211_local *local = sdata->local;
1621
1622         if (local->quiescing)
1623                 return;
1624
1625         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1626 }
1627
1628 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1629 {
1630         struct ieee80211_sub_if_data *sdata =
1631                 (struct ieee80211_sub_if_data *) data;
1632         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1633         struct ieee80211_local *local = sdata->local;
1634
1635         if (local->quiescing)
1636                 return;
1637
1638         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1639 }
1640
1641 static void ieee80211_sta_monitor_work(struct work_struct *work)
1642 {
1643         struct ieee80211_sub_if_data *sdata =
1644                 container_of(work, struct ieee80211_sub_if_data,
1645                              u.mgd.monitor_work);
1646
1647         ieee80211_mgd_probe_ap(sdata, false);
1648 }
1649
1650 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1651 {
1652         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1653                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1654                                         IEEE80211_STA_CONNECTION_POLL);
1655
1656                 /* let's probe the connection once */
1657                 ieee80211_queue_work(&sdata->local->hw,
1658                            &sdata->u.mgd.monitor_work);
1659                 /* and do all the other regular work too */
1660                 ieee80211_queue_work(&sdata->local->hw,
1661                            &sdata->u.mgd.work);
1662         }
1663 }
1664
1665 #ifdef CONFIG_PM
1666 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1667 {
1668         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1669
1670         /*
1671          * we need to use atomic bitops for the running bits
1672          * only because both timers might fire at the same
1673          * time -- the code here is properly synchronised.
1674          */
1675
1676         cancel_work_sync(&ifmgd->work);
1677         cancel_work_sync(&ifmgd->beacon_loss_work);
1678         if (del_timer_sync(&ifmgd->timer))
1679                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1680
1681         cancel_work_sync(&ifmgd->chswitch_work);
1682         if (del_timer_sync(&ifmgd->chswitch_timer))
1683                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1684
1685         cancel_work_sync(&ifmgd->monitor_work);
1686         /* these will just be re-established on connection */
1687         del_timer_sync(&ifmgd->conn_mon_timer);
1688         del_timer_sync(&ifmgd->bcn_mon_timer);
1689 }
1690
1691 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1692 {
1693         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1694
1695         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1696                 add_timer(&ifmgd->timer);
1697         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1698                 add_timer(&ifmgd->chswitch_timer);
1699 }
1700 #endif
1701
1702 /* interface setup */
1703 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1704 {
1705         struct ieee80211_if_managed *ifmgd;
1706
1707         ifmgd = &sdata->u.mgd;
1708         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1709         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1710         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1711         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
1712         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1713                     (unsigned long) sdata);
1714         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1715                     (unsigned long) sdata);
1716         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1717                     (unsigned long) sdata);
1718         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1719                     (unsigned long) sdata);
1720         skb_queue_head_init(&ifmgd->skb_queue);
1721
1722         ifmgd->flags = 0;
1723
1724         mutex_init(&ifmgd->mtx);
1725
1726         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1727                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1728         else
1729                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1730 }
1731
1732 /* scan finished notification */
1733 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1734 {
1735         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1736
1737         /* Restart STA timers */
1738         rcu_read_lock();
1739         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1740                 ieee80211_restart_sta_timer(sdata);
1741         rcu_read_unlock();
1742 }
1743
1744 int ieee80211_max_network_latency(struct notifier_block *nb,
1745                                   unsigned long data, void *dummy)
1746 {
1747         s32 latency_usec = (s32) data;
1748         struct ieee80211_local *local =
1749                 container_of(nb, struct ieee80211_local,
1750                              network_latency_notifier);
1751
1752         mutex_lock(&local->iflist_mtx);
1753         ieee80211_recalc_ps(local, latency_usec);
1754         mutex_unlock(&local->iflist_mtx);
1755
1756         return 0;
1757 }
1758
1759 /* config hooks */
1760 static enum work_done_result
1761 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1762                           struct sk_buff *skb)
1763 {
1764         if (!skb) {
1765                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1766                 return WORK_DONE_DESTROY;
1767         }
1768
1769         if (wk->type == IEEE80211_WORK_AUTH) {
1770                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1771                 return WORK_DONE_DESTROY;
1772         }
1773
1774         mutex_lock(&wk->sdata->u.mgd.mtx);
1775         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1776         mutex_unlock(&wk->sdata->u.mgd.mtx);
1777
1778         wk->type = IEEE80211_WORK_AUTH;
1779         wk->probe_auth.tries = 0;
1780         return WORK_DONE_REQUEUE;
1781 }
1782
1783 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1784                        struct cfg80211_auth_request *req)
1785 {
1786         const u8 *ssid;
1787         struct ieee80211_work *wk;
1788         u16 auth_alg;
1789
1790         switch (req->auth_type) {
1791         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1792                 auth_alg = WLAN_AUTH_OPEN;
1793                 break;
1794         case NL80211_AUTHTYPE_SHARED_KEY:
1795                 auth_alg = WLAN_AUTH_SHARED_KEY;
1796                 break;
1797         case NL80211_AUTHTYPE_FT:
1798                 auth_alg = WLAN_AUTH_FT;
1799                 break;
1800         case NL80211_AUTHTYPE_NETWORK_EAP:
1801                 auth_alg = WLAN_AUTH_LEAP;
1802                 break;
1803         default:
1804                 return -EOPNOTSUPP;
1805         }
1806
1807         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1808         if (!wk)
1809                 return -ENOMEM;
1810
1811         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1812
1813         if (req->ie && req->ie_len) {
1814                 memcpy(wk->ie, req->ie, req->ie_len);
1815                 wk->ie_len = req->ie_len;
1816         }
1817
1818         if (req->key && req->key_len) {
1819                 wk->probe_auth.key_len = req->key_len;
1820                 wk->probe_auth.key_idx = req->key_idx;
1821                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1822         }
1823
1824         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1825         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1826         wk->probe_auth.ssid_len = ssid[1];
1827
1828         wk->probe_auth.algorithm = auth_alg;
1829         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1830
1831         /* if we already have a probe, don't probe again */
1832         if (req->bss->proberesp_ies)
1833                 wk->type = IEEE80211_WORK_AUTH;
1834         else
1835                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1836         wk->chan = req->bss->channel;
1837         wk->sdata = sdata;
1838         wk->done = ieee80211_probe_auth_done;
1839
1840         ieee80211_add_work(wk);
1841         return 0;
1842 }
1843
1844 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1845                                                   struct sk_buff *skb)
1846 {
1847         struct ieee80211_mgmt *mgmt;
1848         u16 status;
1849
1850         if (!skb) {
1851                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1852                 return WORK_DONE_DESTROY;
1853         }
1854
1855         mgmt = (void *)skb->data;
1856         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1857
1858         if (status == WLAN_STATUS_SUCCESS) {
1859                 mutex_lock(&wk->sdata->u.mgd.mtx);
1860                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1861                         mutex_unlock(&wk->sdata->u.mgd.mtx);
1862                         /* oops -- internal error -- send timeout for now */
1863                         cfg80211_send_assoc_timeout(wk->sdata->dev,
1864                                                     wk->filter_ta);
1865                         return WORK_DONE_DESTROY;
1866                 }
1867                 mutex_unlock(&wk->sdata->u.mgd.mtx);
1868         }
1869
1870         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1871         return WORK_DONE_DESTROY;
1872 }
1873
1874 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1875                         struct cfg80211_assoc_request *req)
1876 {
1877         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1878         struct ieee80211_bss *bss = (void *)req->bss->priv;
1879         struct ieee80211_work *wk;
1880         const u8 *ssid;
1881         int i;
1882
1883         mutex_lock(&ifmgd->mtx);
1884         if (ifmgd->associated) {
1885                 mutex_unlock(&ifmgd->mtx);
1886                 return -EALREADY;
1887         }
1888         mutex_unlock(&ifmgd->mtx);
1889
1890         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1891         if (!wk)
1892                 return -ENOMEM;
1893
1894         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
1895
1896         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
1897                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
1898                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
1899                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
1900                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
1901
1902
1903         if (req->ie && req->ie_len) {
1904                 memcpy(wk->ie, req->ie, req->ie_len);
1905                 wk->ie_len = req->ie_len;
1906         } else
1907                 wk->ie_len = 0;
1908
1909         wk->assoc.bss = req->bss;
1910
1911         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1912
1913         /* new association always uses requested smps mode */
1914         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
1915                 if (ifmgd->powersave)
1916                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
1917                 else
1918                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
1919         } else
1920                 ifmgd->ap_smps = ifmgd->req_smps;
1921
1922         wk->assoc.smps = ifmgd->ap_smps;
1923         /*
1924          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
1925          * We still associate in non-HT mode (11a/b/g) if any one of these
1926          * ciphers is configured as pairwise.
1927          * We can set this to true for non-11n hardware, that'll be checked
1928          * separately along with the peer capabilities.
1929          */
1930         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
1931         wk->assoc.capability = req->bss->capability;
1932         wk->assoc.wmm_used = bss->wmm_used;
1933         wk->assoc.supp_rates = bss->supp_rates;
1934         wk->assoc.supp_rates_len = bss->supp_rates_len;
1935         wk->assoc.ht_information_ie =
1936                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
1937
1938         if (bss->wmm_used && bss->uapsd_supported &&
1939             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
1940                 wk->assoc.uapsd_used = true;
1941                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
1942         } else {
1943                 wk->assoc.uapsd_used = false;
1944                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
1945         }
1946
1947         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1948         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
1949         wk->assoc.ssid_len = ssid[1];
1950
1951         if (req->prev_bssid)
1952                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
1953
1954         wk->type = IEEE80211_WORK_ASSOC;
1955         wk->chan = req->bss->channel;
1956         wk->sdata = sdata;
1957         wk->done = ieee80211_assoc_done;
1958
1959         if (req->use_mfp) {
1960                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
1961                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
1962         } else {
1963                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
1964                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
1965         }
1966
1967         if (req->crypto.control_port)
1968                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
1969         else
1970                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
1971
1972         ieee80211_add_work(wk);
1973         return 0;
1974 }
1975
1976 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
1977                          struct cfg80211_deauth_request *req,
1978                          void *cookie)
1979 {
1980         struct ieee80211_local *local = sdata->local;
1981         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1982         struct ieee80211_work *wk;
1983         const u8 *bssid = req->bss->bssid;
1984
1985         mutex_lock(&ifmgd->mtx);
1986
1987         if (ifmgd->associated == req->bss) {
1988                 bssid = req->bss->bssid;
1989                 ieee80211_set_disassoc(sdata);
1990                 mutex_unlock(&ifmgd->mtx);
1991         } else {
1992                 bool not_auth_yet = false;
1993
1994                 mutex_unlock(&ifmgd->mtx);
1995
1996                 mutex_lock(&local->work_mtx);
1997                 list_for_each_entry(wk, &local->work_list, list) {
1998                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE)
1999                                 continue;
2000                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2001                                 continue;
2002                         not_auth_yet = true;
2003                         list_del(&wk->list);
2004                         free_work(wk);
2005                         break;
2006                 }
2007                 mutex_unlock(&local->work_mtx);
2008
2009                 /*
2010                  * If somebody requests authentication and we haven't
2011                  * sent out an auth frame yet there's no need to send
2012                  * out a deauth frame either. If the state was PROBE,
2013                  * then this is the case. If it's AUTH we have sent a
2014                  * frame, and if it's IDLE we have completed the auth
2015                  * process already.
2016                  */
2017                 if (not_auth_yet) {
2018                         __cfg80211_auth_canceled(sdata->dev, bssid);
2019                         return 0;
2020                 }
2021         }
2022
2023         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2024                sdata->name, bssid, req->reason_code);
2025
2026         ieee80211_send_deauth_disassoc(sdata, bssid,
2027                         IEEE80211_STYPE_DEAUTH, req->reason_code,
2028                         cookie);
2029
2030         ieee80211_recalc_idle(sdata->local);
2031
2032         return 0;
2033 }
2034
2035 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2036                            struct cfg80211_disassoc_request *req,
2037                            void *cookie)
2038 {
2039         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2040
2041         mutex_lock(&ifmgd->mtx);
2042
2043         /*
2044          * cfg80211 should catch this ... but it's racy since
2045          * we can receive a disassoc frame, process it, hand it
2046          * to cfg80211 while that's in a locked section already
2047          * trying to tell us that the user wants to disconnect.
2048          */
2049         if (ifmgd->associated != req->bss) {
2050                 mutex_unlock(&ifmgd->mtx);
2051                 return -ENOLINK;
2052         }
2053
2054         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2055                sdata->name, req->bss->bssid, req->reason_code);
2056
2057         ieee80211_set_disassoc(sdata);
2058
2059         mutex_unlock(&ifmgd->mtx);
2060
2061         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2062                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2063                         cookie);
2064
2065         ieee80211_recalc_idle(sdata->local);
2066
2067         return 0;
2068 }