net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/pm_qos_params.h>
  21 #include <linux/crc32.h>
  22 #include <linux/slab.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "driver-ops.h"
  28 #include "rate.h"
  29 #include "led.h"
  30
  31 static int max_nullfunc_tries = 2;
  32 module_param(max_nullfunc_tries, int, 0644);
  33 MODULE_PARM_DESC(max_nullfunc_tries,
  34                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  35
  36 static int max_probe_tries = 5;
  37 module_param(max_probe_tries, int, 0644);
  38 MODULE_PARM_DESC(max_probe_tries,
  39                  "Maximum probe tries before disconnecting (reason 4).");
  40
  41 /*
  42  * Beacon loss timeout is calculated as N frames times the
  43  * advertised beacon interval.  This may need to be somewhat
  44  * higher than what hardware might detect to account for
  45  * delays in the host processing frames. But since we also
  46  * probe on beacon miss before declaring the connection lost
  47  * default to what we want.
  48  */
  49 #define IEEE80211_BEACON_LOSS_COUNT     7
  50
  51 /*
  52  * Time the connection can be idle before we probe
  53  * it to see if we can still talk to the AP.
  54  */
  55 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  56 /*
  57  * Time we wait for a probe response after sending
  58  * a probe request because of beacon loss or for
  59  * checking the connection still works.
  60  */
  61 static int probe_wait_ms = 500;
  62 module_param(probe_wait_ms, int, 0644);
  63 MODULE_PARM_DESC(probe_wait_ms,
  64                  "Maximum time(ms) to wait for probe response"
  65                  " before disconnecting (reason 4).");
  66
  67 /*
  68  * Weight given to the latest Beacon frame when calculating average signal
  69  * strength for Beacon frames received in the current BSS. This must be
  70  * between 1 and 15.
  71  */
  72 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  73
  74 /*
  75  * How many Beacon frames need to have been used in average signal strength
  76  * before starting to indicate signal change events.
  77  */
  78 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  79
  80 #define TMR_RUNNING_TIMER       0
  81 #define TMR_RUNNING_CHANSW      1
  82
  83 /*
  84  * All cfg80211 functions have to be called outside a locked
  85  * section so that they can acquire a lock themselves... This
  86  * is much simpler than queuing up things in cfg80211, but we
  87  * do need some indirection for that here.
  88  */
  89 enum rx_mgmt_action {
  90         /* no action required */
  91         RX_MGMT_NONE,
  92
  93         /* caller must call cfg80211_send_deauth() */
  94         RX_MGMT_CFG80211_DEAUTH,
  95
  96         /* caller must call cfg80211_send_disassoc() */
  97         RX_MGMT_CFG80211_DISASSOC,
  98 };
  99
 100 /* utils */
 101 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 102 {
 103         lockdep_assert_held(&ifmgd->mtx);
 104 }
 105
 106 /*
 107  * We can have multiple work items (and connection probing)
 108  * scheduling this timer, but we need to take care to only
 109  * reschedule it when it should fire _earlier_ than it was
 110  * asked for before, or if it's not pending right now. This
 111  * function ensures that. Note that it then is required to
 112  * run this function for all timeouts after the first one
 113  * has happened -- the work that runs from this timer will
 114  * do that.
 115  */
 116 static void run_again(struct ieee80211_if_managed *ifmgd,
 117                              unsigned long timeout)
 118 {
 119         ASSERT_MGD_MTX(ifmgd);
 120
 121         if (!timer_pending(&ifmgd->timer) ||
 122             time_before(timeout, ifmgd->timer.expires))
 123                 mod_timer(&ifmgd->timer, timeout);
 124 }
 125
 126 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 127 {
 128         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 129                 return;
 130
 131         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 132                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 133 }
 134
 135 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 136 {
 137         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 138
 139         if (unlikely(!sdata->u.mgd.associated))
 140                 return;
 141
 142         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 143                 return;
 144
 145         mod_timer(&sdata->u.mgd.conn_mon_timer,
 146                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 147
 148         ifmgd->probe_send_count = 0;
 149 }
 150
 151 static int ecw2cw(int ecw)
 152 {
 153         return (1 << ecw) - 1;
 154 }
 155
 156 /*
 157  * ieee80211_enable_ht should be called only after the operating band
 158  * has been determined as ht configuration depends on the hw's
 159  * HT abilities for a specific band.
 160  */
 161 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 162                                struct ieee80211_ht_info *hti,
 163                                const u8 *bssid, u16 ap_ht_cap_flags)
 164 {
 165         struct ieee80211_local *local = sdata->local;
 166         struct ieee80211_supported_band *sband;
 167         struct sta_info *sta;
 168         u32 changed = 0;
 169         int hti_cfreq;
 170         u16 ht_opmode;
 171         bool enable_ht = true;
 172         enum nl80211_channel_type prev_chantype;
 173         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 174
 175         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 176
 177         prev_chantype = sdata->vif.bss_conf.channel_type;
 178
 179         /* HT is not supported */
 180         if (!sband->ht_cap.ht_supported)
 181                 enable_ht = false;
 182
 183         if (enable_ht) {
 184                 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
 185                                                            sband->band);
 186                 /* check that channel matches the right operating channel */
 187                 if (local->hw.conf.channel->center_freq != hti_cfreq) {
 188                         /* Some APs mess this up, evidently.
 189                          * Netgear WNDR3700 sometimes reports 4 higher than
 190                          * the actual channel, for instance.
 191                          */
 192                         printk(KERN_DEBUG
 193                                "%s: Wrong control channel in association"
 194                                " response: configured center-freq: %d"
 195                                " hti-cfreq: %d  hti->control_chan: %d"
 196                                " band: %d.  Disabling HT.\n",
 197                                sdata->name,
 198                                local->hw.conf.channel->center_freq,
 199                                hti_cfreq, hti->control_chan,
 200                                sband->band);
 201                         enable_ht = false;
 202                 }
 203         }
 204
 205         if (enable_ht) {
 206                 channel_type = NL80211_CHAN_HT20;
 207
 208                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 209                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 210                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 211                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 212                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 213                                 if (!(local->hw.conf.channel->flags &
 214                                     IEEE80211_CHAN_NO_HT40PLUS))
 215                                         channel_type = NL80211_CHAN_HT40PLUS;
 216                                 break;
 217                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 218                                 if (!(local->hw.conf.channel->flags &
 219                                     IEEE80211_CHAN_NO_HT40MINUS))
 220                                         channel_type = NL80211_CHAN_HT40MINUS;
 221                                 break;
 222                         }
 223                 }
 224         }
 225
 226         if (local->tmp_channel)
 227                 local->tmp_channel_type = channel_type;
 228
 229         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 230                 /* can only fail due to HT40+/- mismatch */
 231                 channel_type = NL80211_CHAN_HT20;
 232                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 233         }
 234
 235         /* channel_type change automatically detected */
 236         ieee80211_hw_config(local, 0);
 237
 238         if (prev_chantype != channel_type) {
 239                 rcu_read_lock();
 240                 sta = sta_info_get(sdata, bssid);
 241                 if (sta)
 242                         rate_control_rate_update(local, sband, sta,
 243                                                  IEEE80211_RC_HT_CHANGED,
 244                                                  channel_type);
 245                 rcu_read_unlock();
 246         }
 247
 248         ht_opmode = le16_to_cpu(hti->operation_mode);
 249
 250         /* if bss configuration changed store the new one */
 251         if (sdata->ht_opmode_valid != enable_ht ||
 252             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 253             prev_chantype != channel_type) {
 254                 changed |= BSS_CHANGED_HT;
 255                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 256                 sdata->ht_opmode_valid = enable_ht;
 257         }
 258
 259         return changed;
 260 }
 261
 262 /* frame sending functions */
 263
 264 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 265                                            const u8 *bssid, u16 stype, u16 reason,
 266                                            void *cookie, bool send_frame)
 267 {
 268         struct ieee80211_local *local = sdata->local;
 269         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 270         struct sk_buff *skb;
 271         struct ieee80211_mgmt *mgmt;
 272
 273         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 274         if (!skb) {
 275                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 276                        "deauth/disassoc frame\n", sdata->name);
 277                 return;
 278         }
 279         skb_reserve(skb, local->hw.extra_tx_headroom);
 280
 281         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 282         memset(mgmt, 0, 24);
 283         memcpy(mgmt->da, bssid, ETH_ALEN);
 284         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 285         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 286         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 287         skb_put(skb, 2);
 288         /* u.deauth.reason_code == u.disassoc.reason_code */
 289         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 290
 291         if (stype == IEEE80211_STYPE_DEAUTH)
 292                 if (cookie)
 293                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 294                 else
 295                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 296         else
 297                 if (cookie)
 298                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 299                 else
 300                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 301         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 302                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 303
 304         if (send_frame)
 305                 ieee80211_tx_skb(sdata, skb);
 306         else
 307                 kfree_skb(skb);
 308 }
 309
 310 void ieee80211_send_pspoll(struct ieee80211_local *local,
 311                            struct ieee80211_sub_if_data *sdata)
 312 {
 313         struct ieee80211_pspoll *pspoll;
 314         struct sk_buff *skb;
 315
 316         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 317         if (!skb)
 318                 return;
 319
 320         pspoll = (struct ieee80211_pspoll *) skb->data;
 321         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 322
 323         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 324         ieee80211_tx_skb(sdata, skb);
 325 }
 326
 327 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 328                              struct ieee80211_sub_if_data *sdata,
 329                              int powersave)
 330 {
 331         struct sk_buff *skb;
 332         struct ieee80211_hdr_3addr *nullfunc;
 333
 334         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 335         if (!skb)
 336                 return;
 337
 338         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 339         if (powersave)
 340                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 341
 342         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 343         ieee80211_tx_skb(sdata, skb);
 344 }
 345
 346 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 347                                           struct ieee80211_sub_if_data *sdata)
 348 {
 349         struct sk_buff *skb;
 350         struct ieee80211_hdr *nullfunc;
 351         __le16 fc;
 352
 353         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 354                 return;
 355
 356         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 357         if (!skb) {
 358                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 359                        "nullfunc frame\n", sdata->name);
 360                 return;
 361         }
 362         skb_reserve(skb, local->hw.extra_tx_headroom);
 363
 364         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 365         memset(nullfunc, 0, 30);
 366         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 367                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 368         nullfunc->frame_control = fc;
 369         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 370         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 371         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 372         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 373
 374         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 375         ieee80211_tx_skb(sdata, skb);
 376 }
 377
 378 /* spectrum management related things */
 379 static void ieee80211_chswitch_work(struct work_struct *work)
 380 {
 381         struct ieee80211_sub_if_data *sdata =
 382                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 383         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 384
 385         if (!ieee80211_sdata_running(sdata))
 386                 return;
 387
 388         mutex_lock(&ifmgd->mtx);
 389         if (!ifmgd->associated)
 390                 goto out;
 391
 392         sdata->local->oper_channel = sdata->local->csa_channel;
 393         if (!sdata->local->ops->channel_switch) {
 394                 /* call "hw_config" only if doing sw channel switch */
 395                 ieee80211_hw_config(sdata->local,
 396                         IEEE80211_CONF_CHANGE_CHANNEL);
 397         }
 398
 399         /* XXX: shouldn't really modify cfg80211-owned data! */
 400         ifmgd->associated->channel = sdata->local->oper_channel;
 401
 402         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 403                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 404  out:
 405         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 406         mutex_unlock(&ifmgd->mtx);
 407 }
 408
 409 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 410 {
 411         struct ieee80211_sub_if_data *sdata;
 412         struct ieee80211_if_managed *ifmgd;
 413
 414         sdata = vif_to_sdata(vif);
 415         ifmgd = &sdata->u.mgd;
 416
 417         trace_api_chswitch_done(sdata, success);
 418         if (!success) {
 419                 /*
 420                  * If the channel switch was not successful, stay
 421                  * around on the old channel. We currently lack
 422                  * good handling of this situation, possibly we
 423                  * should just drop the association.
 424                  */
 425                 sdata->local->csa_channel = sdata->local->oper_channel;
 426         }
 427
 428         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 429 }
 430 EXPORT_SYMBOL(ieee80211_chswitch_done);
 431
 432 static void ieee80211_chswitch_timer(unsigned long data)
 433 {
 434         struct ieee80211_sub_if_data *sdata =
 435                 (struct ieee80211_sub_if_data *) data;
 436         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 437
 438         if (sdata->local->quiescing) {
 439                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 440                 return;
 441         }
 442
 443         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 444 }
 445
 446 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 447                                       struct ieee80211_channel_sw_ie *sw_elem,
 448                                       struct ieee80211_bss *bss,
 449                                       u64 timestamp)
 450 {
 451         struct cfg80211_bss *cbss =
 452                 container_of((void *)bss, struct cfg80211_bss, priv);
 453         struct ieee80211_channel *new_ch;
 454         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 455         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 456                                                       cbss->channel->band);
 457
 458         ASSERT_MGD_MTX(ifmgd);
 459
 460         if (!ifmgd->associated)
 461                 return;
 462
 463         if (sdata->local->scanning)
 464                 return;
 465
 466         /* Disregard subsequent beacons if we are already running a timer
 467            processing a CSA */
 468
 469         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 470                 return;
 471
 472         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 473         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 474                 return;
 475
 476         sdata->local->csa_channel = new_ch;
 477
 478         if (sdata->local->ops->channel_switch) {
 479                 /* use driver's channel switch callback */
 480                 struct ieee80211_channel_switch ch_switch;
 481                 memset(&ch_switch, 0, sizeof(ch_switch));
 482                 ch_switch.timestamp = timestamp;
 483                 if (sw_elem->mode) {
 484                         ch_switch.block_tx = true;
 485                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 486                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 487                 }
 488                 ch_switch.channel = new_ch;
 489                 ch_switch.count = sw_elem->count;
 490                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 491                 drv_channel_switch(sdata->local, &ch_switch);
 492                 return;
 493         }
 494
 495         /* channel switch handled in software */
 496         if (sw_elem->count <= 1) {
 497                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 498         } else {
 499                 if (sw_elem->mode)
 500                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 501                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 502                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 503                 mod_timer(&ifmgd->chswitch_timer,
 504                           jiffies +
 505                           msecs_to_jiffies(sw_elem->count *
 506                                            cbss->beacon_interval));
 507         }
 508 }
 509
 510 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 511                                         u16 capab_info, u8 *pwr_constr_elem,
 512                                         u8 pwr_constr_elem_len)
 513 {
 514         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 515
 516         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 517                 return;
 518
 519         /* Power constraint IE length should be 1 octet */
 520         if (pwr_constr_elem_len != 1)
 521                 return;
 522
 523         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 524             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 525                 sdata->local->power_constr_level = *pwr_constr_elem;
 526                 ieee80211_hw_config(sdata->local, 0);
 527         }
 528 }
 529
 530 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 531 {
 532         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 533         struct ieee80211_local *local = sdata->local;
 534         struct ieee80211_conf *conf = &local->hw.conf;
 535
 536         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 537                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 538                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 539
 540         local->disable_dynamic_ps = false;
 541         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 542 }
 543 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 544
 545 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 546 {
 547         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 548         struct ieee80211_local *local = sdata->local;
 549         struct ieee80211_conf *conf = &local->hw.conf;
 550
 551         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 552                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 553                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 554
 555         local->disable_dynamic_ps = true;
 556         conf->dynamic_ps_timeout = 0;
 557         del_timer_sync(&local->dynamic_ps_timer);
 558         ieee80211_queue_work(&local->hw,
 559                              &local->dynamic_ps_enable_work);
 560 }
 561 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 562
 563 /* powersave */
 564 static void ieee80211_enable_ps(struct ieee80211_local *local,
 565                                 struct ieee80211_sub_if_data *sdata)
 566 {
 567         struct ieee80211_conf *conf = &local->hw.conf;
 568
 569         /*
 570          * If we are scanning right now then the parameters will
 571          * take effect when scan finishes.
 572          */
 573         if (local->scanning)
 574                 return;
 575
 576         if (conf->dynamic_ps_timeout > 0 &&
 577             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 578                 mod_timer(&local->dynamic_ps_timer, jiffies +
 579                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 580         } else {
 581                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 582                         ieee80211_send_nullfunc(local, sdata, 1);
 583
 584                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 585                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 586                         return;
 587
 588                 conf->flags |= IEEE80211_CONF_PS;
 589                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 590         }
 591 }
 592
 593 static void ieee80211_change_ps(struct ieee80211_local *local)
 594 {
 595         struct ieee80211_conf *conf = &local->hw.conf;
 596
 597         if (local->ps_sdata) {
 598                 ieee80211_enable_ps(local, local->ps_sdata);
 599         } else if (conf->flags & IEEE80211_CONF_PS) {
 600                 conf->flags &= ~IEEE80211_CONF_PS;
 601                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 602                 del_timer_sync(&local->dynamic_ps_timer);
 603                 cancel_work_sync(&local->dynamic_ps_enable_work);
 604         }
 605 }
 606
 607 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 608 {
 609         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 610         struct sta_info *sta = NULL;
 611         u32 sta_flags = 0;
 612
 613         if (!mgd->powersave)
 614                 return false;
 615
 616         if (!mgd->associated)
 617                 return false;
 618
 619         if (!mgd->associated->beacon_ies)
 620                 return false;
 621
 622         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 623                           IEEE80211_STA_CONNECTION_POLL))
 624                 return false;
 625
 626         rcu_read_lock();
 627         sta = sta_info_get(sdata, mgd->bssid);
 628         if (sta)
 629                 sta_flags = get_sta_flags(sta);
 630         rcu_read_unlock();
 631
 632         if (!(sta_flags & WLAN_STA_AUTHORIZED))
 633                 return false;
 634
 635         return true;
 636 }
 637
 638 /* need to hold RTNL or interface lock */
 639 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 640 {
 641         struct ieee80211_sub_if_data *sdata, *found = NULL;
 642         int count = 0;
 643         int timeout;
 644
 645         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 646                 local->ps_sdata = NULL;
 647                 return;
 648         }
 649
 650         if (!list_empty(&local->work_list)) {
 651                 local->ps_sdata = NULL;
 652                 goto change;
 653         }
 654
 655         list_for_each_entry(sdata, &local->interfaces, list) {
 656                 if (!ieee80211_sdata_running(sdata))
 657                         continue;
 658                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 659                         /* If an AP vif is found, then disable PS
 660                          * by setting the count to zero thereby setting
 661                          * ps_sdata to NULL.
 662                          */
 663                         count = 0;
 664                         break;
 665                 }
 666                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 667                         continue;
 668                 found = sdata;
 669                 count++;
 670         }
 671
 672         if (count == 1 && ieee80211_powersave_allowed(found)) {
 673                 struct ieee80211_conf *conf = &local->hw.conf;
 674                 s32 beaconint_us;
 675
 676                 if (latency < 0)
 677                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 678
 679                 beaconint_us = ieee80211_tu_to_usec(
 680                                         found->vif.bss_conf.beacon_int);
 681
 682                 timeout = local->dynamic_ps_forced_timeout;
 683                 if (timeout < 0) {
 684                         /*
 685                          * Go to full PSM if the user configures a very low
 686                          * latency requirement.
 687                          * The 2000 second value is there for compatibility
 688                          * until the PM_QOS_NETWORK_LATENCY is configured
 689                          * with real values.
 690                          */
 691                         if (latency > (1900 * USEC_PER_MSEC) &&
 692                             latency != (2000 * USEC_PER_SEC))
 693                                 timeout = 0;
 694                         else
 695                                 timeout = 100;
 696                 }
 697                 local->dynamic_ps_user_timeout = timeout;
 698                 if (!local->disable_dynamic_ps)
 699                         conf->dynamic_ps_timeout =
 700                                 local->dynamic_ps_user_timeout;
 701
 702                 if (beaconint_us > latency) {
 703                         local->ps_sdata = NULL;
 704                 } else {
 705                         struct ieee80211_bss *bss;
 706                         int maxslp = 1;
 707                         u8 dtimper;
 708
 709                         bss = (void *)found->u.mgd.associated->priv;
 710                         dtimper = bss->dtim_period;
 711
 712                         /* If the TIM IE is invalid, pretend the value is 1 */
 713                         if (!dtimper)
 714                                 dtimper = 1;
 715                         else if (dtimper > 1)
 716                                 maxslp = min_t(int, dtimper,
 717                                                     latency / beaconint_us);
 718
 719                         local->hw.conf.max_sleep_period = maxslp;
 720                         local->hw.conf.ps_dtim_period = dtimper;
 721                         local->ps_sdata = found;
 722                 }
 723         } else {
 724                 local->ps_sdata = NULL;
 725         }
 726
 727  change:
 728         ieee80211_change_ps(local);
 729 }
 730
 731 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 732 {
 733         struct ieee80211_local *local =
 734                 container_of(work, struct ieee80211_local,
 735                              dynamic_ps_disable_work);
 736
 737         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 738                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 739                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 740         }
 741
 742         ieee80211_wake_queues_by_reason(&local->hw,
 743                                         IEEE80211_QUEUE_STOP_REASON_PS);
 744 }
 745
 746 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 747 {
 748         struct ieee80211_local *local =
 749                 container_of(work, struct ieee80211_local,
 750                              dynamic_ps_enable_work);
 751         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 752         struct ieee80211_if_managed *ifmgd;
 753         unsigned long flags;
 754         int q;
 755
 756         /* can only happen when PS was just disabled anyway */
 757         if (!sdata)
 758                 return;
 759
 760         ifmgd = &sdata->u.mgd;
 761
 762         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 763                 return;
 764
 765         if (!local->disable_dynamic_ps &&
 766             local->hw.conf.dynamic_ps_timeout > 0) {
 767                 /* don't enter PS if TX frames are pending */
 768                 if (drv_tx_frames_pending(local)) {
 769                         mod_timer(&local->dynamic_ps_timer, jiffies +
 770                                   msecs_to_jiffies(
 771                                   local->hw.conf.dynamic_ps_timeout));
 772                         return;
 773                 }
 774
 775                 /*
 776                  * transmission can be stopped by others which leads to
 777                  * dynamic_ps_timer expiry. Postpone the ps timer if it
 778                  * is not the actual idle state.
 779                  */
 780                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 781                 for (q = 0; q < local->hw.queues; q++) {
 782                         if (local->queue_stop_reasons[q]) {
 783                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
 784                                                        flags);
 785                                 mod_timer(&local->dynamic_ps_timer, jiffies +
 786                                           msecs_to_jiffies(
 787                                           local->hw.conf.dynamic_ps_timeout));
 788                                 return;
 789                         }
 790                 }
 791                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 792         }
 793
 794         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 795             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) {
 796                 netif_tx_stop_all_queues(sdata->dev);
 797
 798                 if (drv_tx_frames_pending(local))
 799                         mod_timer(&local->dynamic_ps_timer, jiffies +
 800                                   msecs_to_jiffies(
 801                                   local->hw.conf.dynamic_ps_timeout));
 802                 else {
 803                         ieee80211_send_nullfunc(local, sdata, 1);
 804                         /* Flush to get the tx status of nullfunc frame */
 805                         drv_flush(local, false);
 806                 }
 807         }
 808
 809         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 810               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 811             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 812                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 813                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 814                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 815         }
 816
 817         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 818                 netif_tx_wake_all_queues(sdata->dev);
 819 }
 820
 821 void ieee80211_dynamic_ps_timer(unsigned long data)
 822 {
 823         struct ieee80211_local *local = (void *) data;
 824
 825         if (local->quiescing || local->suspended)
 826                 return;
 827
 828         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 829 }
 830
 831 /* MLME */
 832 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 833                                      struct ieee80211_sub_if_data *sdata,
 834                                      u8 *wmm_param, size_t wmm_param_len)
 835 {
 836         struct ieee80211_tx_queue_params params;
 837         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 838         size_t left;
 839         int count;
 840         u8 *pos, uapsd_queues = 0;
 841
 842         if (!local->ops->conf_tx)
 843                 return;
 844
 845         if (local->hw.queues < 4)
 846                 return;
 847
 848         if (!wmm_param)
 849                 return;
 850
 851         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 852                 return;
 853
 854         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 855                 uapsd_queues = local->uapsd_queues;
 856
 857         count = wmm_param[6] & 0x0f;
 858         if (count == ifmgd->wmm_last_param_set)
 859                 return;
 860         ifmgd->wmm_last_param_set = count;
 861
 862         pos = wmm_param + 8;
 863         left = wmm_param_len - 8;
 864
 865         memset(&params, 0, sizeof(params));
 866
 867         local->wmm_acm = 0;
 868         for (; left >= 4; left -= 4, pos += 4) {
 869                 int aci = (pos[0] >> 5) & 0x03;
 870                 int acm = (pos[0] >> 4) & 0x01;
 871                 bool uapsd = false;
 872                 int queue;
 873
 874                 switch (aci) {
 875                 case 1: /* AC_BK */
 876                         queue = 3;
 877                         if (acm)
 878                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 879                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 880                                 uapsd = true;
 881                         break;
 882                 case 2: /* AC_VI */
 883                         queue = 1;
 884                         if (acm)
 885                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 886                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 887                                 uapsd = true;
 888                         break;
 889                 case 3: /* AC_VO */
 890                         queue = 0;
 891                         if (acm)
 892                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 893                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 894                                 uapsd = true;
 895                         break;
 896                 case 0: /* AC_BE */
 897                 default:
 898                         queue = 2;
 899                         if (acm)
 900                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 901                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 902                                 uapsd = true;
 903                         break;
 904                 }
 905
 906                 params.aifs = pos[0] & 0x0f;
 907                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 908                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 909                 params.txop = get_unaligned_le16(pos + 2);
 910                 params.uapsd = uapsd;
 911
 912 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 913                 wiphy_debug(local->hw.wiphy,
 914                             "WMM queue=%d aci=%d acm=%d aifs=%d "
 915                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 916                             queue, aci, acm,
 917                             params.aifs, params.cw_min, params.cw_max,
 918                             params.txop, params.uapsd);
 919 #endif
 920                 local->tx_conf[queue] = params;
 921                 if (drv_conf_tx(local, queue, &params))
 922                         wiphy_debug(local->hw.wiphy,
 923                                     "failed to set TX queue parameters for queue %d\n",
 924                                     queue);
 925         }
 926
 927         /* enable WMM or activate new settings */
 928         sdata->vif.bss_conf.qos = true;
 929         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 930 }
 931
 932 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 933                                            u16 capab, bool erp_valid, u8 erp)
 934 {
 935         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 936         u32 changed = 0;
 937         bool use_protection;
 938         bool use_short_preamble;
 939         bool use_short_slot;
 940
 941         if (erp_valid) {
 942                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 943                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 944         } else {
 945                 use_protection = false;
 946                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 947         }
 948
 949         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 950         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 951                 use_short_slot = true;
 952
 953         if (use_protection != bss_conf->use_cts_prot) {
 954                 bss_conf->use_cts_prot = use_protection;
 955                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 956         }
 957
 958         if (use_short_preamble != bss_conf->use_short_preamble) {
 959                 bss_conf->use_short_preamble = use_short_preamble;
 960                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 961         }
 962
 963         if (use_short_slot != bss_conf->use_short_slot) {
 964                 bss_conf->use_short_slot = use_short_slot;
 965                 changed |= BSS_CHANGED_ERP_SLOT;
 966         }
 967
 968         return changed;
 969 }
 970
 971 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 972                                      struct cfg80211_bss *cbss,
 973                                      u32 bss_info_changed)
 974 {
 975         struct ieee80211_bss *bss = (void *)cbss->priv;
 976         struct ieee80211_local *local = sdata->local;
 977         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 978
 979         bss_info_changed |= BSS_CHANGED_ASSOC;
 980         /* set timing information */
 981         bss_conf->beacon_int = cbss->beacon_interval;
 982         bss_conf->timestamp = cbss->tsf;
 983
 984         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 985         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 986                 cbss->capability, bss->has_erp_value, bss->erp_value);
 987
 988         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
 989                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
 990
 991         sdata->u.mgd.associated = cbss;
 992         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 993
 994         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 995
 996         /* just to be sure */
 997         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 998                                 IEEE80211_STA_BEACON_POLL);
 999
1000         ieee80211_led_assoc(local, 1);
1001
1002         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1003                 bss_conf->dtim_period = bss->dtim_period;
1004         else
1005                 bss_conf->dtim_period = 0;
1006
1007         bss_conf->assoc = 1;
1008         /*
1009          * For now just always ask the driver to update the basic rateset
1010          * when we have associated, we aren't checking whether it actually
1011          * changed or not.
1012          */
1013         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
1014
1015         /* And the BSSID changed - we're associated now */
1016         bss_info_changed |= BSS_CHANGED_BSSID;
1017
1018         /* Tell the driver to monitor connection quality (if supported) */
1019         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
1020             bss_conf->cqm_rssi_thold)
1021                 bss_info_changed |= BSS_CHANGED_CQM;
1022
1023         /* Enable ARP filtering */
1024         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1025                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1026                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1027         }
1028
1029         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1030
1031         mutex_lock(&local->iflist_mtx);
1032         ieee80211_recalc_ps(local, -1);
1033         ieee80211_recalc_smps(local);
1034         mutex_unlock(&local->iflist_mtx);
1035
1036         netif_tx_start_all_queues(sdata->dev);
1037         netif_carrier_on(sdata->dev);
1038 }
1039
1040 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1041                                    bool remove_sta, bool tx)
1042 {
1043         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1044         struct ieee80211_local *local = sdata->local;
1045         struct sta_info *sta;
1046         u32 changed = 0, config_changed = 0;
1047         u8 bssid[ETH_ALEN];
1048
1049         ASSERT_MGD_MTX(ifmgd);
1050
1051         if (WARN_ON(!ifmgd->associated))
1052                 return;
1053
1054         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1055
1056         ifmgd->associated = NULL;
1057         memset(ifmgd->bssid, 0, ETH_ALEN);
1058
1059         /*
1060          * we need to commit the associated = NULL change because the
1061          * scan code uses that to determine whether this iface should
1062          * go to/wake up from powersave or not -- and could otherwise
1063          * wake the queues erroneously.
1064          */
1065         smp_mb();
1066
1067         /*
1068          * Thus, we can only afterwards stop the queues -- to account
1069          * for the case where another CPU is finishing a scan at this
1070          * time -- we don't want the scan code to enable queues.
1071          */
1072
1073         netif_tx_stop_all_queues(sdata->dev);
1074         netif_carrier_off(sdata->dev);
1075
1076         mutex_lock(&local->sta_mtx);
1077         sta = sta_info_get(sdata, bssid);
1078         if (sta) {
1079                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
1080                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1081         }
1082         mutex_unlock(&local->sta_mtx);
1083
1084         changed |= ieee80211_reset_erp_info(sdata);
1085
1086         ieee80211_led_assoc(local, 0);
1087         changed |= BSS_CHANGED_ASSOC;
1088         sdata->vif.bss_conf.assoc = false;
1089
1090         ieee80211_set_wmm_default(sdata);
1091
1092         /* channel(_type) changes are handled by ieee80211_hw_config */
1093         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1094
1095         /* on the next assoc, re-program HT parameters */
1096         sdata->ht_opmode_valid = false;
1097
1098         local->power_constr_level = 0;
1099
1100         del_timer_sync(&local->dynamic_ps_timer);
1101         cancel_work_sync(&local->dynamic_ps_enable_work);
1102
1103         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1104                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1105                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1106         }
1107         local->ps_sdata = NULL;
1108
1109         ieee80211_hw_config(local, config_changed);
1110
1111         /* Disable ARP filtering */
1112         if (sdata->vif.bss_conf.arp_filter_enabled) {
1113                 sdata->vif.bss_conf.arp_filter_enabled = false;
1114                 changed |= BSS_CHANGED_ARP_FILTER;
1115         }
1116
1117         /* The BSSID (not really interesting) and HT changed */
1118         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1119         ieee80211_bss_info_change_notify(sdata, changed);
1120
1121         if (remove_sta)
1122                 sta_info_destroy_addr(sdata, bssid);
1123
1124         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1125         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1126         del_timer_sync(&sdata->u.mgd.timer);
1127         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1128 }
1129
1130 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1131                              struct ieee80211_hdr *hdr)
1132 {
1133         /*
1134          * We can postpone the mgd.timer whenever receiving unicast frames
1135          * from AP because we know that the connection is working both ways
1136          * at that time. But multicast frames (and hence also beacons) must
1137          * be ignored here, because we need to trigger the timer during
1138          * data idle periods for sending the periodic probe request to the
1139          * AP we're connected to.
1140          */
1141         if (is_multicast_ether_addr(hdr->addr1))
1142                 return;
1143
1144         ieee80211_sta_reset_conn_monitor(sdata);
1145 }
1146
1147 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1148 {
1149         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1150
1151         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1152                               IEEE80211_STA_CONNECTION_POLL)))
1153             return;
1154
1155         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1156                           IEEE80211_STA_BEACON_POLL);
1157         mutex_lock(&sdata->local->iflist_mtx);
1158         ieee80211_recalc_ps(sdata->local, -1);
1159         mutex_unlock(&sdata->local->iflist_mtx);
1160
1161         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1162                 return;
1163
1164         /*
1165          * We've received a probe response, but are not sure whether
1166          * we have or will be receiving any beacons or data, so let's
1167          * schedule the timers again, just in case.
1168          */
1169         ieee80211_sta_reset_beacon_monitor(sdata);
1170
1171         mod_timer(&ifmgd->conn_mon_timer,
1172                   round_jiffies_up(jiffies +
1173                                    IEEE80211_CONNECTION_IDLE_TIME));
1174 }
1175
1176 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1177                              struct ieee80211_hdr *hdr, bool ack)
1178 {
1179         if (!ieee80211_is_data(hdr->frame_control))
1180             return;
1181
1182         if (ack)
1183                 ieee80211_sta_reset_conn_monitor(sdata);
1184
1185         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1186             sdata->u.mgd.probe_send_count > 0) {
1187                 if (ack)
1188                         sdata->u.mgd.probe_send_count = 0;
1189                 else
1190                         sdata->u.mgd.nullfunc_failed = true;
1191                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1192         }
1193 }
1194
1195 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1196 {
1197         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1198         const u8 *ssid;
1199         u8 *dst = ifmgd->associated->bssid;
1200         u8 unicast_limit = max(1, max_probe_tries - 3);
1201
1202         /*
1203          * Try sending broadcast probe requests for the last three
1204          * probe requests after the first ones failed since some
1205          * buggy APs only support broadcast probe requests.
1206          */
1207         if (ifmgd->probe_send_count >= unicast_limit)
1208                 dst = NULL;
1209
1210         /*
1211          * When the hardware reports an accurate Tx ACK status, it's
1212          * better to send a nullfunc frame instead of a probe request,
1213          * as it will kick us off the AP quickly if we aren't associated
1214          * anymore. The timeout will be reset if the frame is ACKed by
1215          * the AP.
1216          */
1217         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1218                 ifmgd->nullfunc_failed = false;
1219                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1220         } else {
1221                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1222                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0,
1223                                          (u32) -1, true);
1224         }
1225
1226         ifmgd->probe_send_count++;
1227         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1228         run_again(ifmgd, ifmgd->probe_timeout);
1229 }
1230
1231 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1232                                    bool beacon)
1233 {
1234         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1235         bool already = false;
1236
1237         if (!ieee80211_sdata_running(sdata))
1238                 return;
1239
1240         if (sdata->local->scanning)
1241                 return;
1242
1243         if (sdata->local->tmp_channel)
1244                 return;
1245
1246         mutex_lock(&ifmgd->mtx);
1247
1248         if (!ifmgd->associated)
1249                 goto out;
1250
1251 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1252         if (beacon && net_ratelimit())
1253                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1254                        "- sending probe request\n", sdata->name);
1255 #endif
1256
1257         /*
1258          * The driver/our work has already reported this event or the
1259          * connection monitoring has kicked in and we have already sent
1260          * a probe request. Or maybe the AP died and the driver keeps
1261          * reporting until we disassociate...
1262          *
1263          * In either case we have to ignore the current call to this
1264          * function (except for setting the correct probe reason bit)
1265          * because otherwise we would reset the timer every time and
1266          * never check whether we received a probe response!
1267          */
1268         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1269                             IEEE80211_STA_CONNECTION_POLL))
1270                 already = true;
1271
1272         if (beacon)
1273                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1274         else
1275                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1276
1277         if (already)
1278                 goto out;
1279
1280         mutex_lock(&sdata->local->iflist_mtx);
1281         ieee80211_recalc_ps(sdata->local, -1);
1282         mutex_unlock(&sdata->local->iflist_mtx);
1283
1284         ifmgd->probe_send_count = 0;
1285         ieee80211_mgd_probe_ap_send(sdata);
1286  out:
1287         mutex_unlock(&ifmgd->mtx);
1288 }
1289
1290 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1291                                           struct ieee80211_vif *vif)
1292 {
1293         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1294         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1295         struct sk_buff *skb;
1296         const u8 *ssid;
1297
1298         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1299                 return NULL;
1300
1301         ASSERT_MGD_MTX(ifmgd);
1302
1303         if (!ifmgd->associated)
1304                 return NULL;
1305
1306         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1307         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1308                                         (u32) -1, ssid + 2, ssid[1],
1309                                         NULL, 0, true);
1310
1311         return skb;
1312 }
1313 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1314
1315 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1316 {
1317         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1318         struct ieee80211_local *local = sdata->local;
1319         u8 bssid[ETH_ALEN];
1320
1321         mutex_lock(&ifmgd->mtx);
1322         if (!ifmgd->associated) {
1323                 mutex_unlock(&ifmgd->mtx);
1324                 return;
1325         }
1326
1327         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1328
1329         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1330                sdata->name, bssid);
1331
1332         ieee80211_set_disassoc(sdata, true, true);
1333         mutex_unlock(&ifmgd->mtx);
1334
1335         mutex_lock(&local->mtx);
1336         ieee80211_recalc_idle(local);
1337         mutex_unlock(&local->mtx);
1338         /*
1339          * must be outside lock due to cfg80211,
1340          * but that's not a problem.
1341          */
1342         ieee80211_send_deauth_disassoc(sdata, bssid,
1343                                        IEEE80211_STYPE_DEAUTH,
1344                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1345                                        NULL, true);
1346 }
1347
1348 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1349 {
1350         struct ieee80211_sub_if_data *sdata =
1351                 container_of(work, struct ieee80211_sub_if_data,
1352                              u.mgd.beacon_connection_loss_work);
1353
1354         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1355                 __ieee80211_connection_loss(sdata);
1356         else
1357                 ieee80211_mgd_probe_ap(sdata, true);
1358 }
1359
1360 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1361 {
1362         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1363         struct ieee80211_hw *hw = &sdata->local->hw;
1364
1365         trace_api_beacon_loss(sdata);
1366
1367         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1368         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1369 }
1370 EXPORT_SYMBOL(ieee80211_beacon_loss);
1371
1372 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1373 {
1374         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1375         struct ieee80211_hw *hw = &sdata->local->hw;
1376
1377         trace_api_connection_loss(sdata);
1378
1379         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1380         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1381 }
1382 EXPORT_SYMBOL(ieee80211_connection_loss);
1383
1384
1385 static enum rx_mgmt_action __must_check
1386 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1387                          struct ieee80211_mgmt *mgmt, size_t len)
1388 {
1389         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1390         const u8 *bssid = NULL;
1391         u16 reason_code;
1392
1393         if (len < 24 + 2)
1394                 return RX_MGMT_NONE;
1395
1396         ASSERT_MGD_MTX(ifmgd);
1397
1398         bssid = ifmgd->associated->bssid;
1399
1400         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1401
1402         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1403                         sdata->name, bssid, reason_code);
1404
1405         ieee80211_set_disassoc(sdata, true, false);
1406         mutex_lock(&sdata->local->mtx);
1407         ieee80211_recalc_idle(sdata->local);
1408         mutex_unlock(&sdata->local->mtx);
1409
1410         return RX_MGMT_CFG80211_DEAUTH;
1411 }
1412
1413
1414 static enum rx_mgmt_action __must_check
1415 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1416                            struct ieee80211_mgmt *mgmt, size_t len)
1417 {
1418         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1419         u16 reason_code;
1420
1421         if (len < 24 + 2)
1422                 return RX_MGMT_NONE;
1423
1424         ASSERT_MGD_MTX(ifmgd);
1425
1426         if (WARN_ON(!ifmgd->associated))
1427                 return RX_MGMT_NONE;
1428
1429         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1430                 return RX_MGMT_NONE;
1431
1432         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1433
1434         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1435                         sdata->name, mgmt->sa, reason_code);
1436
1437         ieee80211_set_disassoc(sdata, true, false);
1438         mutex_lock(&sdata->local->mtx);
1439         ieee80211_recalc_idle(sdata->local);
1440         mutex_unlock(&sdata->local->mtx);
1441         return RX_MGMT_CFG80211_DISASSOC;
1442 }
1443
1444
1445 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1446                                     struct ieee80211_mgmt *mgmt, size_t len)
1447 {
1448         struct ieee80211_sub_if_data *sdata = wk->sdata;
1449         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1450         struct ieee80211_local *local = sdata->local;
1451         struct ieee80211_supported_band *sband;
1452         struct sta_info *sta;
1453         struct cfg80211_bss *cbss = wk->assoc.bss;
1454         u8 *pos;
1455         u32 rates, basic_rates;
1456         u16 capab_info, aid;
1457         struct ieee802_11_elems elems;
1458         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1459         u32 changed = 0;
1460         int i, j, err;
1461         bool have_higher_than_11mbit = false;
1462         u16 ap_ht_cap_flags;
1463
1464         /* AssocResp and ReassocResp have identical structure */
1465
1466         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1467         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1468
1469         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1470                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1471                        "set\n", sdata->name, aid);
1472         aid &= ~(BIT(15) | BIT(14));
1473
1474         pos = mgmt->u.assoc_resp.variable;
1475         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1476
1477         if (!elems.supp_rates) {
1478                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1479                        sdata->name);
1480                 return false;
1481         }
1482
1483         ifmgd->aid = aid;
1484
1485         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1486         if (!sta) {
1487                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1488                        " the AP\n", sdata->name);
1489                 return false;
1490         }
1491
1492         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1493                            WLAN_STA_ASSOC_AP);
1494         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1495                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1496
1497         rates = 0;
1498         basic_rates = 0;
1499         sband = local->hw.wiphy->bands[wk->chan->band];
1500
1501         for (i = 0; i < elems.supp_rates_len; i++) {
1502                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1503                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1504
1505                 if (rate > 110)
1506                         have_higher_than_11mbit = true;
1507
1508                 for (j = 0; j < sband->n_bitrates; j++) {
1509                         if (sband->bitrates[j].bitrate == rate) {
1510                                 rates |= BIT(j);
1511                                 if (is_basic)
1512                                         basic_rates |= BIT(j);
1513                                 break;
1514                         }
1515                 }
1516         }
1517
1518         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1519                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1520                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1521
1522                 if (rate > 110)
1523                         have_higher_than_11mbit = true;
1524
1525                 for (j = 0; j < sband->n_bitrates; j++) {
1526                         if (sband->bitrates[j].bitrate == rate) {
1527                                 rates |= BIT(j);
1528                                 if (is_basic)
1529                                         basic_rates |= BIT(j);
1530                                 break;
1531                         }
1532                 }
1533         }
1534
1535         sta->sta.supp_rates[wk->chan->band] = rates;
1536         sdata->vif.bss_conf.basic_rates = basic_rates;
1537
1538         /* cf. IEEE 802.11 9.2.12 */
1539         if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1540             have_higher_than_11mbit)
1541                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1542         else
1543                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1544
1545         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1546                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1547                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1548
1549         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1550
1551         rate_control_rate_init(sta);
1552
1553         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1554                 set_sta_flags(sta, WLAN_STA_MFP);
1555
1556         if (elems.wmm_param)
1557                 set_sta_flags(sta, WLAN_STA_WME);
1558
1559         err = sta_info_insert(sta);
1560         sta = NULL;
1561         if (err) {
1562                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1563                        " the AP (error %d)\n", sdata->name, err);
1564                 return false;
1565         }
1566
1567         /*
1568          * Always handle WMM once after association regardless
1569          * of the first value the AP uses. Setting -1 here has
1570          * that effect because the AP values is an unsigned
1571          * 4-bit value.
1572          */
1573         ifmgd->wmm_last_param_set = -1;
1574
1575         if (elems.wmm_param)
1576                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1577                                          elems.wmm_param_len);
1578         else
1579                 ieee80211_set_wmm_default(sdata);
1580
1581         local->oper_channel = wk->chan;
1582
1583         if (elems.ht_info_elem && elems.wmm_param &&
1584             (sdata->local->hw.queues >= 4) &&
1585             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1586                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1587                                                cbss->bssid, ap_ht_cap_flags);
1588
1589         /* set AID and assoc capability,
1590          * ieee80211_set_associated() will tell the driver */
1591         bss_conf->aid = aid;
1592         bss_conf->assoc_capability = capab_info;
1593         ieee80211_set_associated(sdata, cbss, changed);
1594
1595         /*
1596          * If we're using 4-addr mode, let the AP know that we're
1597          * doing so, so that it can create the STA VLAN on its side
1598          */
1599         if (ifmgd->use_4addr)
1600                 ieee80211_send_4addr_nullfunc(local, sdata);
1601
1602         /*
1603          * Start timer to probe the connection to the AP now.
1604          * Also start the timer that will detect beacon loss.
1605          */
1606         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1607         ieee80211_sta_reset_beacon_monitor(sdata);
1608
1609         return true;
1610 }
1611
1612
1613 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1614                                   struct ieee80211_mgmt *mgmt,
1615                                   size_t len,
1616                                   struct ieee80211_rx_status *rx_status,
1617                                   struct ieee802_11_elems *elems,
1618                                   bool beacon)
1619 {
1620         struct ieee80211_local *local = sdata->local;
1621         int freq;
1622         struct ieee80211_bss *bss;
1623         struct ieee80211_channel *channel;
1624         bool need_ps = false;
1625
1626         if (sdata->u.mgd.associated) {
1627                 bss = (void *)sdata->u.mgd.associated->priv;
1628                 /* not previously set so we may need to recalc */
1629                 need_ps = !bss->dtim_period;
1630         }
1631
1632         if (elems->ds_params && elems->ds_params_len == 1)
1633                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1634                                                       rx_status->band);
1635         else
1636                 freq = rx_status->freq;
1637
1638         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1639
1640         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1641                 return;
1642
1643         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1644                                         channel, beacon);
1645         if (bss)
1646                 ieee80211_rx_bss_put(local, bss);
1647
1648         if (!sdata->u.mgd.associated)
1649                 return;
1650
1651         if (need_ps) {
1652                 mutex_lock(&local->iflist_mtx);
1653                 ieee80211_recalc_ps(local, -1);
1654                 mutex_unlock(&local->iflist_mtx);
1655         }
1656
1657         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1658             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1659                                                         ETH_ALEN) == 0)) {
1660                 struct ieee80211_channel_sw_ie *sw_elem =
1661                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1662                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1663                                                  bss, rx_status->mactime);
1664         }
1665 }
1666
1667
1668 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1669                                          struct sk_buff *skb)
1670 {
1671         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1672         struct ieee80211_if_managed *ifmgd;
1673         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1674         size_t baselen, len = skb->len;
1675         struct ieee802_11_elems elems;
1676
1677         ifmgd = &sdata->u.mgd;
1678
1679         ASSERT_MGD_MTX(ifmgd);
1680
1681         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1682                 return; /* ignore ProbeResp to foreign address */
1683
1684         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1685         if (baselen > len)
1686                 return;
1687
1688         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1689                                 &elems);
1690
1691         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1692
1693         if (ifmgd->associated &&
1694             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1695                 ieee80211_reset_ap_probe(sdata);
1696 }
1697
1698 /*
1699  * This is the canonical list of information elements we care about,
1700  * the filter code also gives us all changes to the Microsoft OUI
1701  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1702  *
1703  * We implement beacon filtering in software since that means we can
1704  * avoid processing the frame here and in cfg80211, and userspace
1705  * will not be able to tell whether the hardware supports it or not.
1706  *
1707  * XXX: This list needs to be dynamic -- userspace needs to be able to
1708  *      add items it requires. It also needs to be able to tell us to
1709  *      look out for other vendor IEs.
1710  */
1711 static const u64 care_about_ies =
1712         (1ULL << WLAN_EID_COUNTRY) |
1713         (1ULL << WLAN_EID_ERP_INFO) |
1714         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1715         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1716         (1ULL << WLAN_EID_HT_CAPABILITY) |
1717         (1ULL << WLAN_EID_HT_INFORMATION);
1718
1719 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1720                                      struct ieee80211_mgmt *mgmt,
1721                                      size_t len,
1722                                      struct ieee80211_rx_status *rx_status)
1723 {
1724         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1725         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1726         size_t baselen;
1727         struct ieee802_11_elems elems;
1728         struct ieee80211_local *local = sdata->local;
1729         u32 changed = 0;
1730         bool erp_valid, directed_tim = false;
1731         u8 erp_value = 0;
1732         u32 ncrc;
1733         u8 *bssid;
1734
1735         ASSERT_MGD_MTX(ifmgd);
1736
1737         /* Process beacon from the current BSS */
1738         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1739         if (baselen > len)
1740                 return;
1741
1742         if (rx_status->freq != local->hw.conf.channel->center_freq)
1743                 return;
1744
1745         /*
1746          * We might have received a number of frames, among them a
1747          * disassoc frame and a beacon...
1748          */
1749         if (!ifmgd->associated)
1750                 return;
1751
1752         bssid = ifmgd->associated->bssid;
1753
1754         /*
1755          * And in theory even frames from a different AP we were just
1756          * associated to a split-second ago!
1757          */
1758         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1759                 return;
1760
1761         /* Track average RSSI from the Beacon frames of the current AP */
1762         ifmgd->last_beacon_signal = rx_status->signal;
1763         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1764                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1765                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1766                 ifmgd->last_cqm_event_signal = 0;
1767                 ifmgd->count_beacon_signal = 1;
1768                 ifmgd->last_ave_beacon_signal = 0;
1769         } else {
1770                 ifmgd->ave_beacon_signal =
1771                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1772                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1773                          ifmgd->ave_beacon_signal) / 16;
1774                 ifmgd->count_beacon_signal++;
1775         }
1776
1777         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
1778             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
1779                 int sig = ifmgd->ave_beacon_signal;
1780                 int last_sig = ifmgd->last_ave_beacon_signal;
1781
1782                 /*
1783                  * if signal crosses either of the boundaries, invoke callback
1784                  * with appropriate parameters
1785                  */
1786                 if (sig > ifmgd->rssi_max_thold &&
1787                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
1788                         ifmgd->last_ave_beacon_signal = sig;
1789                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
1790                 } else if (sig < ifmgd->rssi_min_thold &&
1791                            (last_sig >= ifmgd->rssi_max_thold ||
1792                            last_sig == 0)) {
1793                         ifmgd->last_ave_beacon_signal = sig;
1794                         drv_rssi_callback(local, RSSI_EVENT_LOW);
1795                 }
1796         }
1797
1798         if (bss_conf->cqm_rssi_thold &&
1799             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1800             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1801                 int sig = ifmgd->ave_beacon_signal / 16;
1802                 int last_event = ifmgd->last_cqm_event_signal;
1803                 int thold = bss_conf->cqm_rssi_thold;
1804                 int hyst = bss_conf->cqm_rssi_hyst;
1805                 if (sig < thold &&
1806                     (last_event == 0 || sig < last_event - hyst)) {
1807                         ifmgd->last_cqm_event_signal = sig;
1808                         ieee80211_cqm_rssi_notify(
1809                                 &sdata->vif,
1810                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1811                                 GFP_KERNEL);
1812                 } else if (sig > thold &&
1813                            (last_event == 0 || sig > last_event + hyst)) {
1814                         ifmgd->last_cqm_event_signal = sig;
1815                         ieee80211_cqm_rssi_notify(
1816                                 &sdata->vif,
1817                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1818                                 GFP_KERNEL);
1819                 }
1820         }
1821
1822         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1823 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1824                 if (net_ratelimit()) {
1825                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1826                                "to a received beacon\n", sdata->name);
1827                 }
1828 #endif
1829                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1830                 mutex_lock(&local->iflist_mtx);
1831                 ieee80211_recalc_ps(local, -1);
1832                 mutex_unlock(&local->iflist_mtx);
1833         }
1834
1835         /*
1836          * Push the beacon loss detection into the future since
1837          * we are processing a beacon from the AP just now.
1838          */
1839         ieee80211_sta_reset_beacon_monitor(sdata);
1840
1841         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1842         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1843                                           len - baselen, &elems,
1844                                           care_about_ies, ncrc);
1845
1846         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1847                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1848                                                    ifmgd->aid);
1849
1850         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1851                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1852                                       true);
1853
1854                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1855                                          elems.wmm_param_len);
1856         }
1857
1858         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1859                 if (directed_tim) {
1860                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1861                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1862                                 ieee80211_hw_config(local,
1863                                                     IEEE80211_CONF_CHANGE_PS);
1864                                 ieee80211_send_nullfunc(local, sdata, 0);
1865                         } else {
1866                                 local->pspolling = true;
1867
1868                                 /*
1869                                  * Here is assumed that the driver will be
1870                                  * able to send ps-poll frame and receive a
1871                                  * response even though power save mode is
1872                                  * enabled, but some drivers might require
1873                                  * to disable power save here. This needs
1874                                  * to be investigated.
1875                                  */
1876                                 ieee80211_send_pspoll(local, sdata);
1877                         }
1878                 }
1879         }
1880
1881         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1882                 return;
1883         ifmgd->beacon_crc = ncrc;
1884         ifmgd->beacon_crc_valid = true;
1885
1886         if (elems.erp_info && elems.erp_info_len >= 1) {
1887                 erp_valid = true;
1888                 erp_value = elems.erp_info[0];
1889         } else {
1890                 erp_valid = false;
1891         }
1892         changed |= ieee80211_handle_bss_capability(sdata,
1893                         le16_to_cpu(mgmt->u.beacon.capab_info),
1894                         erp_valid, erp_value);
1895
1896
1897         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1898             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1899                 struct sta_info *sta;
1900                 struct ieee80211_supported_band *sband;
1901                 u16 ap_ht_cap_flags;
1902
1903                 rcu_read_lock();
1904
1905                 sta = sta_info_get(sdata, bssid);
1906                 if (WARN_ON(!sta)) {
1907                         rcu_read_unlock();
1908                         return;
1909                 }
1910
1911                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1912
1913                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1914                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1915
1916                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1917
1918                 rcu_read_unlock();
1919
1920                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1921                                                bssid, ap_ht_cap_flags);
1922         }
1923
1924         /* Note: country IE parsing is done for us by cfg80211 */
1925         if (elems.country_elem) {
1926                 /* TODO: IBSS also needs this */
1927                 if (elems.pwr_constr_elem)
1928                         ieee80211_handle_pwr_constr(sdata,
1929                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1930                                 elems.pwr_constr_elem,
1931                                 elems.pwr_constr_elem_len);
1932         }
1933
1934         ieee80211_bss_info_change_notify(sdata, changed);
1935 }
1936
1937 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1938                                   struct sk_buff *skb)
1939 {
1940         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1941         struct ieee80211_rx_status *rx_status;
1942         struct ieee80211_mgmt *mgmt;
1943         enum rx_mgmt_action rma = RX_MGMT_NONE;
1944         u16 fc;
1945
1946         rx_status = (struct ieee80211_rx_status *) skb->cb;
1947         mgmt = (struct ieee80211_mgmt *) skb->data;
1948         fc = le16_to_cpu(mgmt->frame_control);
1949
1950         mutex_lock(&ifmgd->mtx);
1951
1952         if (ifmgd->associated &&
1953             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1954                 switch (fc & IEEE80211_FCTL_STYPE) {
1955                 case IEEE80211_STYPE_BEACON:
1956                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1957                                                  rx_status);
1958                         break;
1959                 case IEEE80211_STYPE_PROBE_RESP:
1960                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1961                         break;
1962                 case IEEE80211_STYPE_DEAUTH:
1963                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1964                         break;
1965                 case IEEE80211_STYPE_DISASSOC:
1966                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1967                         break;
1968                 case IEEE80211_STYPE_ACTION:
1969                         switch (mgmt->u.action.category) {
1970                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1971                                 ieee80211_sta_process_chanswitch(sdata,
1972                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1973                                                 (void *)ifmgd->associated->priv,
1974                                                 rx_status->mactime);
1975                                 break;
1976                         }
1977                 }
1978                 mutex_unlock(&ifmgd->mtx);
1979
1980                 switch (rma) {
1981                 case RX_MGMT_NONE:
1982                         /* no action */
1983                         break;
1984                 case RX_MGMT_CFG80211_DEAUTH:
1985                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1986                         break;
1987                 case RX_MGMT_CFG80211_DISASSOC:
1988                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1989                         break;
1990                 default:
1991                         WARN(1, "unexpected: %d", rma);
1992                 }
1993                 return;
1994         }
1995
1996         mutex_unlock(&ifmgd->mtx);
1997
1998         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1999             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
2000                 struct ieee80211_local *local = sdata->local;
2001                 struct ieee80211_work *wk;
2002
2003                 mutex_lock(&local->mtx);
2004                 list_for_each_entry(wk, &local->work_list, list) {
2005                         if (wk->sdata != sdata)
2006                                 continue;
2007
2008                         if (wk->type != IEEE80211_WORK_ASSOC &&
2009                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2010                                 continue;
2011
2012                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
2013                                 continue;
2014                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
2015                                 continue;
2016
2017                         /*
2018                          * Printing the message only here means we can't
2019                          * spuriously print it, but it also means that it
2020                          * won't be printed when the frame comes in before
2021                          * we even tried to associate or in similar cases.
2022                          *
2023                          * Ultimately, I suspect cfg80211 should print the
2024                          * messages instead.
2025                          */
2026                         printk(KERN_DEBUG
2027                                "%s: deauthenticated from %pM (Reason: %u)\n",
2028                                sdata->name, mgmt->bssid,
2029                                le16_to_cpu(mgmt->u.deauth.reason_code));
2030
2031                         list_del_rcu(&wk->list);
2032                         free_work(wk);
2033                         break;
2034                 }
2035                 mutex_unlock(&local->mtx);
2036
2037                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2038         }
2039 }
2040
2041 static void ieee80211_sta_timer(unsigned long data)
2042 {
2043         struct ieee80211_sub_if_data *sdata =
2044                 (struct ieee80211_sub_if_data *) data;
2045         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2046         struct ieee80211_local *local = sdata->local;
2047
2048         if (local->quiescing) {
2049                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2050                 return;
2051         }
2052
2053         ieee80211_queue_work(&local->hw, &sdata->work);
2054 }
2055
2056 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2057                                           u8 *bssid, u8 reason)
2058 {
2059         struct ieee80211_local *local = sdata->local;
2060         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2061
2062         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2063                           IEEE80211_STA_BEACON_POLL);
2064
2065         ieee80211_set_disassoc(sdata, true, true);
2066         mutex_unlock(&ifmgd->mtx);
2067         mutex_lock(&local->mtx);
2068         ieee80211_recalc_idle(local);
2069         mutex_unlock(&local->mtx);
2070         /*
2071          * must be outside lock due to cfg80211,
2072          * but that's not a problem.
2073          */
2074         ieee80211_send_deauth_disassoc(sdata, bssid,
2075                         IEEE80211_STYPE_DEAUTH, reason,
2076                         NULL, true);
2077         mutex_lock(&ifmgd->mtx);
2078 }
2079
2080 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2081 {
2082         struct ieee80211_local *local = sdata->local;
2083         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2084
2085         /* then process the rest of the work */
2086         mutex_lock(&ifmgd->mtx);
2087
2088         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2089                             IEEE80211_STA_CONNECTION_POLL) &&
2090             ifmgd->associated) {
2091                 u8 bssid[ETH_ALEN];
2092                 int max_tries;
2093
2094                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2095
2096                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2097                         max_tries = max_nullfunc_tries;
2098                 else
2099                         max_tries = max_probe_tries;
2100
2101                 /* ACK received for nullfunc probing frame */
2102                 if (!ifmgd->probe_send_count)
2103                         ieee80211_reset_ap_probe(sdata);
2104                 else if (ifmgd->nullfunc_failed) {
2105                         if (ifmgd->probe_send_count < max_tries) {
2106 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2107                                 wiphy_debug(local->hw.wiphy,
2108                                             "%s: No ack for nullfunc frame to"
2109                                             " AP %pM, try %d/%i\n",
2110                                             sdata->name, bssid,
2111                                             ifmgd->probe_send_count, max_tries);
2112 #endif
2113                                 ieee80211_mgd_probe_ap_send(sdata);
2114                         } else {
2115 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2116                                 wiphy_debug(local->hw.wiphy,
2117                                             "%s: No ack for nullfunc frame to"
2118                                             " AP %pM, disconnecting.\n",
2119                                             sdata->name, bssid);
2120 #endif
2121                                 ieee80211_sta_connection_lost(sdata, bssid,
2122                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2123                         }
2124                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2125                         run_again(ifmgd, ifmgd->probe_timeout);
2126                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2127 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2128                         wiphy_debug(local->hw.wiphy,
2129                                     "%s: Failed to send nullfunc to AP %pM"
2130                                     " after %dms, disconnecting.\n",
2131                                     sdata->name,
2132                                     bssid, probe_wait_ms);
2133 #endif
2134                         ieee80211_sta_connection_lost(sdata, bssid,
2135                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2136                 } else if (ifmgd->probe_send_count < max_tries) {
2137 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2138                         wiphy_debug(local->hw.wiphy,
2139                                     "%s: No probe response from AP %pM"
2140                                     " after %dms, try %d/%i\n",
2141                                     sdata->name,
2142                                     bssid, probe_wait_ms,
2143                                     ifmgd->probe_send_count, max_tries);
2144 #endif
2145                         ieee80211_mgd_probe_ap_send(sdata);
2146                 } else {
2147                         /*
2148                          * We actually lost the connection ... or did we?
2149                          * Let's make sure!
2150                          */
2151                         wiphy_debug(local->hw.wiphy,
2152                                     "%s: No probe response from AP %pM"
2153                                     " after %dms, disconnecting.\n",
2154                                     sdata->name,
2155                                     bssid, probe_wait_ms);
2156
2157                         ieee80211_sta_connection_lost(sdata, bssid,
2158                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2159                 }
2160         }
2161
2162         mutex_unlock(&ifmgd->mtx);
2163 }
2164
2165 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2166 {
2167         struct ieee80211_sub_if_data *sdata =
2168                 (struct ieee80211_sub_if_data *) data;
2169         struct ieee80211_local *local = sdata->local;
2170
2171         if (local->quiescing)
2172                 return;
2173
2174         ieee80211_queue_work(&sdata->local->hw,
2175                              &sdata->u.mgd.beacon_connection_loss_work);
2176 }
2177
2178 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2179 {
2180         struct ieee80211_sub_if_data *sdata =
2181                 (struct ieee80211_sub_if_data *) data;
2182         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2183         struct ieee80211_local *local = sdata->local;
2184
2185         if (local->quiescing)
2186                 return;
2187
2188         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2189 }
2190
2191 static void ieee80211_sta_monitor_work(struct work_struct *work)
2192 {
2193         struct ieee80211_sub_if_data *sdata =
2194                 container_of(work, struct ieee80211_sub_if_data,
2195                              u.mgd.monitor_work);
2196
2197         ieee80211_mgd_probe_ap(sdata, false);
2198 }
2199
2200 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2201 {
2202         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2203                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2204                                         IEEE80211_STA_CONNECTION_POLL);
2205
2206                 /* let's probe the connection once */
2207                 ieee80211_queue_work(&sdata->local->hw,
2208                            &sdata->u.mgd.monitor_work);
2209                 /* and do all the other regular work too */
2210                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2211         }
2212 }
2213
2214 #ifdef CONFIG_PM
2215 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2216 {
2217         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2218
2219         /*
2220          * we need to use atomic bitops for the running bits
2221          * only because both timers might fire at the same
2222          * time -- the code here is properly synchronised.
2223          */
2224
2225         cancel_work_sync(&ifmgd->request_smps_work);
2226
2227         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2228         if (del_timer_sync(&ifmgd->timer))
2229                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2230
2231         cancel_work_sync(&ifmgd->chswitch_work);
2232         if (del_timer_sync(&ifmgd->chswitch_timer))
2233                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2234
2235         cancel_work_sync(&ifmgd->monitor_work);
2236         /* these will just be re-established on connection */
2237         del_timer_sync(&ifmgd->conn_mon_timer);
2238         del_timer_sync(&ifmgd->bcn_mon_timer);
2239 }
2240
2241 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2242 {
2243         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2244
2245         if (!ifmgd->associated)
2246                 return;
2247
2248         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2249                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2250                 mutex_lock(&ifmgd->mtx);
2251                 if (ifmgd->associated) {
2252 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2253                         wiphy_debug(sdata->local->hw.wiphy,
2254                                     "%s: driver requested disconnect after resume.\n",
2255                                     sdata->name);
2256 #endif
2257                         ieee80211_sta_connection_lost(sdata,
2258                                 ifmgd->associated->bssid,
2259                                 WLAN_REASON_UNSPECIFIED);
2260                         mutex_unlock(&ifmgd->mtx);
2261                         return;
2262                 }
2263                 mutex_unlock(&ifmgd->mtx);
2264         }
2265
2266         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2267                 add_timer(&ifmgd->timer);
2268         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2269                 add_timer(&ifmgd->chswitch_timer);
2270         ieee80211_sta_reset_beacon_monitor(sdata);
2271         ieee80211_restart_sta_timer(sdata);
2272         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.monitor_work);
2273 }
2274 #endif
2275
2276 /* interface setup */
2277 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2278 {
2279         struct ieee80211_if_managed *ifmgd;
2280
2281         ifmgd = &sdata->u.mgd;
2282         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2283         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2284         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2285                   ieee80211_beacon_connection_loss_work);
2286         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2287         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2288                     (unsigned long) sdata);
2289         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2290                     (unsigned long) sdata);
2291         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2292                     (unsigned long) sdata);
2293         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2294                     (unsigned long) sdata);
2295
2296         ifmgd->flags = 0;
2297
2298         mutex_init(&ifmgd->mtx);
2299
2300         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2301                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2302         else
2303                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2304 }
2305
2306 /* scan finished notification */
2307 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2308 {
2309         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2310
2311         /* Restart STA timers */
2312         rcu_read_lock();
2313         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2314                 ieee80211_restart_sta_timer(sdata);
2315         rcu_read_unlock();
2316 }
2317
2318 int ieee80211_max_network_latency(struct notifier_block *nb,
2319                                   unsigned long data, void *dummy)
2320 {
2321         s32 latency_usec = (s32) data;
2322         struct ieee80211_local *local =
2323                 container_of(nb, struct ieee80211_local,
2324                              network_latency_notifier);
2325
2326         mutex_lock(&local->iflist_mtx);
2327         ieee80211_recalc_ps(local, latency_usec);
2328         mutex_unlock(&local->iflist_mtx);
2329
2330         return 0;
2331 }
2332
2333 /* config hooks */
2334 static enum work_done_result
2335 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2336                           struct sk_buff *skb)
2337 {
2338         struct ieee80211_local *local = wk->sdata->local;
2339
2340         if (!skb) {
2341                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2342                 goto destroy;
2343         }
2344
2345         if (wk->type == IEEE80211_WORK_AUTH) {
2346                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2347                 goto destroy;
2348         }
2349
2350         mutex_lock(&wk->sdata->u.mgd.mtx);
2351         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2352         mutex_unlock(&wk->sdata->u.mgd.mtx);
2353
2354         wk->type = IEEE80211_WORK_AUTH;
2355         wk->probe_auth.tries = 0;
2356         return WORK_DONE_REQUEUE;
2357  destroy:
2358         if (wk->probe_auth.synced)
2359                 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2360                                    IEEE80211_TX_SYNC_AUTH);
2361
2362         return WORK_DONE_DESTROY;
2363 }
2364
2365 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2366                        struct cfg80211_auth_request *req)
2367 {
2368         const u8 *ssid;
2369         struct ieee80211_work *wk;
2370         u16 auth_alg;
2371
2372         if (req->local_state_change)
2373                 return 0; /* no need to update mac80211 state */
2374
2375         switch (req->auth_type) {
2376         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2377                 auth_alg = WLAN_AUTH_OPEN;
2378                 break;
2379         case NL80211_AUTHTYPE_SHARED_KEY:
2380                 if (IS_ERR(sdata->local->wep_tx_tfm))
2381                         return -EOPNOTSUPP;
2382                 auth_alg = WLAN_AUTH_SHARED_KEY;
2383                 break;
2384         case NL80211_AUTHTYPE_FT:
2385                 auth_alg = WLAN_AUTH_FT;
2386                 break;
2387         case NL80211_AUTHTYPE_NETWORK_EAP:
2388                 auth_alg = WLAN_AUTH_LEAP;
2389                 break;
2390         default:
2391                 return -EOPNOTSUPP;
2392         }
2393
2394         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2395         if (!wk)
2396                 return -ENOMEM;
2397
2398         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2399
2400         if (req->ie && req->ie_len) {
2401                 memcpy(wk->ie, req->ie, req->ie_len);
2402                 wk->ie_len = req->ie_len;
2403         }
2404
2405         if (req->key && req->key_len) {
2406                 wk->probe_auth.key_len = req->key_len;
2407                 wk->probe_auth.key_idx = req->key_idx;
2408                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2409         }
2410
2411         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2412         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2413         wk->probe_auth.ssid_len = ssid[1];
2414
2415         wk->probe_auth.algorithm = auth_alg;
2416         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2417
2418         /* if we already have a probe, don't probe again */
2419         if (req->bss->proberesp_ies)
2420                 wk->type = IEEE80211_WORK_AUTH;
2421         else
2422                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2423         wk->chan = req->bss->channel;
2424         wk->chan_type = NL80211_CHAN_NO_HT;
2425         wk->sdata = sdata;
2426         wk->done = ieee80211_probe_auth_done;
2427
2428         ieee80211_add_work(wk);
2429         return 0;
2430 }
2431
2432 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2433                                                   struct sk_buff *skb)
2434 {
2435         struct ieee80211_local *local = wk->sdata->local;
2436         struct ieee80211_mgmt *mgmt;
2437         struct ieee80211_rx_status *rx_status;
2438         struct ieee802_11_elems elems;
2439         u16 status;
2440
2441         if (!skb) {
2442                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2443                 goto destroy;
2444         }
2445
2446         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2447                 mutex_lock(&wk->sdata->u.mgd.mtx);
2448                 rx_status = (void *) skb->cb;
2449                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2450                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2451                                       &elems, true);
2452                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2453
2454                 wk->type = IEEE80211_WORK_ASSOC;
2455                 /* not really done yet */
2456                 return WORK_DONE_REQUEUE;
2457         }
2458
2459         mgmt = (void *)skb->data;
2460         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2461
2462         if (status == WLAN_STATUS_SUCCESS) {
2463                 if (wk->assoc.synced)
2464                         drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2465                                            IEEE80211_TX_SYNC_ASSOC);
2466
2467                 mutex_lock(&wk->sdata->u.mgd.mtx);
2468                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2469                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2470                         /* oops -- internal error -- send timeout for now */
2471                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2472                                                     wk->filter_ta);
2473                         return WORK_DONE_DESTROY;
2474                 }
2475
2476                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2477         }
2478
2479         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2480  destroy:
2481         if (wk->assoc.synced)
2482                 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2483                                    IEEE80211_TX_SYNC_ASSOC);
2484
2485         return WORK_DONE_DESTROY;
2486 }
2487
2488 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2489                         struct cfg80211_assoc_request *req)
2490 {
2491         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2492         struct ieee80211_bss *bss = (void *)req->bss->priv;
2493         struct ieee80211_work *wk;
2494         const u8 *ssid;
2495         int i;
2496
2497         mutex_lock(&ifmgd->mtx);
2498         if (ifmgd->associated) {
2499                 if (!req->prev_bssid ||
2500                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2501                            ETH_ALEN)) {
2502                         /*
2503                          * We are already associated and the request was not a
2504                          * reassociation request from the current BSS, so
2505                          * reject it.
2506                          */
2507                         mutex_unlock(&ifmgd->mtx);
2508                         return -EALREADY;
2509                 }
2510
2511                 /* Trying to reassociate - clear previous association state */
2512                 ieee80211_set_disassoc(sdata, true, false);
2513         }
2514         mutex_unlock(&ifmgd->mtx);
2515
2516         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2517         if (!wk)
2518                 return -ENOMEM;
2519
2520         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2521         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2522
2523         ifmgd->beacon_crc_valid = false;
2524
2525         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2526                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2527                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2528                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2529                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2530
2531
2532         if (req->ie && req->ie_len) {
2533                 memcpy(wk->ie, req->ie, req->ie_len);
2534                 wk->ie_len = req->ie_len;
2535         } else
2536                 wk->ie_len = 0;
2537
2538         wk->assoc.bss = req->bss;
2539
2540         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2541
2542         /* new association always uses requested smps mode */
2543         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2544                 if (ifmgd->powersave)
2545                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2546                 else
2547                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2548         } else
2549                 ifmgd->ap_smps = ifmgd->req_smps;
2550
2551         wk->assoc.smps = ifmgd->ap_smps;
2552         /*
2553          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2554          * We still associate in non-HT mode (11a/b/g) if any one of these
2555          * ciphers is configured as pairwise.
2556          * We can set this to true for non-11n hardware, that'll be checked
2557          * separately along with the peer capabilities.
2558          */
2559         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2560         wk->assoc.capability = req->bss->capability;
2561         wk->assoc.wmm_used = bss->wmm_used;
2562         wk->assoc.supp_rates = bss->supp_rates;
2563         wk->assoc.supp_rates_len = bss->supp_rates_len;
2564         wk->assoc.ht_information_ie =
2565                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2566
2567         if (bss->wmm_used && bss->uapsd_supported &&
2568             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2569                 wk->assoc.uapsd_used = true;
2570                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2571         } else {
2572                 wk->assoc.uapsd_used = false;
2573                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2574         }
2575
2576         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2577         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2578         wk->assoc.ssid_len = ssid[1];
2579
2580         if (req->prev_bssid)
2581                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2582
2583         wk->chan = req->bss->channel;
2584         wk->chan_type = NL80211_CHAN_NO_HT;
2585         wk->sdata = sdata;
2586         wk->done = ieee80211_assoc_done;
2587         if (!bss->dtim_period &&
2588             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2589                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2590         else
2591                 wk->type = IEEE80211_WORK_ASSOC;
2592
2593         if (req->use_mfp) {
2594                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2595                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2596         } else {
2597                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2598                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2599         }
2600
2601         if (req->crypto.control_port)
2602                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2603         else
2604                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2605
2606         sdata->control_port_protocol = req->crypto.control_port_ethertype;
2607         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2608
2609         ieee80211_add_work(wk);
2610         return 0;
2611 }
2612
2613 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2614                          struct cfg80211_deauth_request *req,
2615                          void *cookie)
2616 {
2617         struct ieee80211_local *local = sdata->local;
2618         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2619         struct ieee80211_work *wk;
2620         u8 bssid[ETH_ALEN];
2621         bool assoc_bss = false;
2622
2623         mutex_lock(&ifmgd->mtx);
2624
2625         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2626         if (ifmgd->associated == req->bss) {
2627                 ieee80211_set_disassoc(sdata, false, true);
2628                 mutex_unlock(&ifmgd->mtx);
2629                 assoc_bss = true;
2630         } else {
2631                 bool not_auth_yet = false;
2632
2633                 mutex_unlock(&ifmgd->mtx);
2634
2635                 mutex_lock(&local->mtx);
2636                 list_for_each_entry(wk, &local->work_list, list) {
2637                         if (wk->sdata != sdata)
2638                                 continue;
2639
2640                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2641                             wk->type != IEEE80211_WORK_AUTH &&
2642                             wk->type != IEEE80211_WORK_ASSOC &&
2643                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2644                                 continue;
2645
2646                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2647                                 continue;
2648
2649                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2650                         list_del_rcu(&wk->list);
2651                         free_work(wk);
2652                         break;
2653                 }
2654                 mutex_unlock(&local->mtx);
2655
2656                 /*
2657                  * If somebody requests authentication and we haven't
2658                  * sent out an auth frame yet there's no need to send
2659                  * out a deauth frame either. If the state was PROBE,
2660                  * then this is the case. If it's AUTH we have sent a
2661                  * frame, and if it's IDLE we have completed the auth
2662                  * process already.
2663                  */
2664                 if (not_auth_yet) {
2665                         __cfg80211_auth_canceled(sdata->dev, bssid);
2666                         return 0;
2667                 }
2668         }
2669
2670         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2671                sdata->name, bssid, req->reason_code);
2672
2673         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2674                                        req->reason_code, cookie,
2675                                        !req->local_state_change);
2676         if (assoc_bss)
2677                 sta_info_destroy_addr(sdata, bssid);
2678
2679         mutex_lock(&sdata->local->mtx);
2680         ieee80211_recalc_idle(sdata->local);
2681         mutex_unlock(&sdata->local->mtx);
2682
2683         return 0;
2684 }
2685
2686 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2687                            struct cfg80211_disassoc_request *req,
2688                            void *cookie)
2689 {
2690         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2691         u8 bssid[ETH_ALEN];
2692
2693         mutex_lock(&ifmgd->mtx);
2694
2695         /*
2696          * cfg80211 should catch this ... but it's racy since
2697          * we can receive a disassoc frame, process it, hand it
2698          * to cfg80211 while that's in a locked section already
2699          * trying to tell us that the user wants to disconnect.
2700          */
2701         if (ifmgd->associated != req->bss) {
2702                 mutex_unlock(&ifmgd->mtx);
2703                 return -ENOLINK;
2704         }
2705
2706         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2707                sdata->name, req->bss->bssid, req->reason_code);
2708
2709         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2710         ieee80211_set_disassoc(sdata, false, true);
2711
2712         mutex_unlock(&ifmgd->mtx);
2713
2714         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2715                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2716                         cookie, !req->local_state_change);
2717         sta_info_destroy_addr(sdata, bssid);
2718
2719         mutex_lock(&sdata->local->mtx);
2720         ieee80211_recalc_idle(sdata->local);
2721         mutex_unlock(&sdata->local->mtx);
2722
2723         return 0;
2724 }
2725
2726 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2727                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2728                                gfp_t gfp)
2729 {
2730         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2731
2732         trace_api_cqm_rssi_notify(sdata, rssi_event);
2733
2734         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2735 }
2736 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
2737
2738 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
2739 {
2740         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2741         return sdata->dev->operstate;
2742 }
2743 EXPORT_SYMBOL(ieee80211_get_operstate);