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                 return;
 276
 277         skb_reserve(skb, local->hw.extra_tx_headroom);
 278
 279         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 280         memset(mgmt, 0, 24);
 281         memcpy(mgmt->da, bssid, ETH_ALEN);
 282         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 283         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 284         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 285         skb_put(skb, 2);
 286         /* u.deauth.reason_code == u.disassoc.reason_code */
 287         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 288
 289         if (stype == IEEE80211_STYPE_DEAUTH)
 290                 if (cookie)
 291                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 292                 else
 293                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 294         else
 295                 if (cookie)
 296                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 297                 else
 298                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 299         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 300                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 301
 302         if (send_frame)
 303                 ieee80211_tx_skb(sdata, skb);
 304         else
 305                 kfree_skb(skb);
 306 }
 307
 308 void ieee80211_send_pspoll(struct ieee80211_local *local,
 309                            struct ieee80211_sub_if_data *sdata)
 310 {
 311         struct ieee80211_pspoll *pspoll;
 312         struct sk_buff *skb;
 313
 314         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 315         if (!skb)
 316                 return;
 317
 318         pspoll = (struct ieee80211_pspoll *) skb->data;
 319         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 320
 321         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 322         ieee80211_tx_skb(sdata, skb);
 323 }
 324
 325 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 326                              struct ieee80211_sub_if_data *sdata,
 327                              int powersave)
 328 {
 329         struct sk_buff *skb;
 330         struct ieee80211_hdr_3addr *nullfunc;
 331
 332         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 333         if (!skb)
 334                 return;
 335
 336         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 337         if (powersave)
 338                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 339
 340         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 341         ieee80211_tx_skb(sdata, skb);
 342 }
 343
 344 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 345                                           struct ieee80211_sub_if_data *sdata)
 346 {
 347         struct sk_buff *skb;
 348         struct ieee80211_hdr *nullfunc;
 349         __le16 fc;
 350
 351         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 352                 return;
 353
 354         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 355         if (!skb)
 356                 return;
 357
 358         skb_reserve(skb, local->hw.extra_tx_headroom);
 359
 360         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 361         memset(nullfunc, 0, 30);
 362         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 363                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 364         nullfunc->frame_control = fc;
 365         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 366         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 367         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 368         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 369
 370         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 371         ieee80211_tx_skb(sdata, skb);
 372 }
 373
 374 /* spectrum management related things */
 375 static void ieee80211_chswitch_work(struct work_struct *work)
 376 {
 377         struct ieee80211_sub_if_data *sdata =
 378                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 379         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 380
 381         if (!ieee80211_sdata_running(sdata))
 382                 return;
 383
 384         mutex_lock(&ifmgd->mtx);
 385         if (!ifmgd->associated)
 386                 goto out;
 387
 388         sdata->local->oper_channel = sdata->local->csa_channel;
 389         if (!sdata->local->ops->channel_switch) {
 390                 /* call "hw_config" only if doing sw channel switch */
 391                 ieee80211_hw_config(sdata->local,
 392                         IEEE80211_CONF_CHANGE_CHANNEL);
 393         } else {
 394                 /* update the device channel directly */
 395                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
 396         }
 397
 398         /* XXX: shouldn't really modify cfg80211-owned data! */
 399         ifmgd->associated->channel = sdata->local->oper_channel;
 400
 401         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 402                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 403  out:
 404         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 405         mutex_unlock(&ifmgd->mtx);
 406 }
 407
 408 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 409 {
 410         struct ieee80211_sub_if_data *sdata;
 411         struct ieee80211_if_managed *ifmgd;
 412
 413         sdata = vif_to_sdata(vif);
 414         ifmgd = &sdata->u.mgd;
 415
 416         trace_api_chswitch_done(sdata, success);
 417         if (!success) {
 418                 /*
 419                  * If the channel switch was not successful, stay
 420                  * around on the old channel. We currently lack
 421                  * good handling of this situation, possibly we
 422                  * should just drop the association.
 423                  */
 424                 sdata->local->csa_channel = sdata->local->oper_channel;
 425         }
 426
 427         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 428 }
 429 EXPORT_SYMBOL(ieee80211_chswitch_done);
 430
 431 static void ieee80211_chswitch_timer(unsigned long data)
 432 {
 433         struct ieee80211_sub_if_data *sdata =
 434                 (struct ieee80211_sub_if_data *) data;
 435         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 436
 437         if (sdata->local->quiescing) {
 438                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 439                 return;
 440         }
 441
 442         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 443 }
 444
 445 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 446                                       struct ieee80211_channel_sw_ie *sw_elem,
 447                                       struct ieee80211_bss *bss,
 448                                       u64 timestamp)
 449 {
 450         struct cfg80211_bss *cbss =
 451                 container_of((void *)bss, struct cfg80211_bss, priv);
 452         struct ieee80211_channel *new_ch;
 453         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 454         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 455                                                       cbss->channel->band);
 456
 457         ASSERT_MGD_MTX(ifmgd);
 458
 459         if (!ifmgd->associated)
 460                 return;
 461
 462         if (sdata->local->scanning)
 463                 return;
 464
 465         /* Disregard subsequent beacons if we are already running a timer
 466            processing a CSA */
 467
 468         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 469                 return;
 470
 471         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 472         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 473                 return;
 474
 475         sdata->local->csa_channel = new_ch;
 476
 477         if (sdata->local->ops->channel_switch) {
 478                 /* use driver's channel switch callback */
 479                 struct ieee80211_channel_switch ch_switch;
 480                 memset(&ch_switch, 0, sizeof(ch_switch));
 481                 ch_switch.timestamp = timestamp;
 482                 if (sw_elem->mode) {
 483                         ch_switch.block_tx = true;
 484                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 485                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 486                 }
 487                 ch_switch.channel = new_ch;
 488                 ch_switch.count = sw_elem->count;
 489                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 490                 drv_channel_switch(sdata->local, &ch_switch);
 491                 return;
 492         }
 493
 494         /* channel switch handled in software */
 495         if (sw_elem->count <= 1) {
 496                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 497         } else {
 498                 if (sw_elem->mode)
 499                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 500                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 501                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 502                 mod_timer(&ifmgd->chswitch_timer,
 503                           jiffies +
 504                           msecs_to_jiffies(sw_elem->count *
 505                                            cbss->beacon_interval));
 506         }
 507 }
 508
 509 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 510                                         u16 capab_info, u8 *pwr_constr_elem,
 511                                         u8 pwr_constr_elem_len)
 512 {
 513         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 514
 515         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 516                 return;
 517
 518         /* Power constraint IE length should be 1 octet */
 519         if (pwr_constr_elem_len != 1)
 520                 return;
 521
 522         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 523             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 524                 sdata->local->power_constr_level = *pwr_constr_elem;
 525                 ieee80211_hw_config(sdata->local, 0);
 526         }
 527 }
 528
 529 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 530 {
 531         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 532         struct ieee80211_local *local = sdata->local;
 533         struct ieee80211_conf *conf = &local->hw.conf;
 534
 535         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 536                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 537                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 538
 539         local->disable_dynamic_ps = false;
 540         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 541 }
 542 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 543
 544 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 545 {
 546         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 547         struct ieee80211_local *local = sdata->local;
 548         struct ieee80211_conf *conf = &local->hw.conf;
 549
 550         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 551                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 552                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 553
 554         local->disable_dynamic_ps = true;
 555         conf->dynamic_ps_timeout = 0;
 556         del_timer_sync(&local->dynamic_ps_timer);
 557         ieee80211_queue_work(&local->hw,
 558                              &local->dynamic_ps_enable_work);
 559 }
 560 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 561
 562 /* powersave */
 563 static void ieee80211_enable_ps(struct ieee80211_local *local,
 564                                 struct ieee80211_sub_if_data *sdata)
 565 {
 566         struct ieee80211_conf *conf = &local->hw.conf;
 567
 568         /*
 569          * If we are scanning right now then the parameters will
 570          * take effect when scan finishes.
 571          */
 572         if (local->scanning)
 573                 return;
 574
 575         if (conf->dynamic_ps_timeout > 0 &&
 576             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 577                 mod_timer(&local->dynamic_ps_timer, jiffies +
 578                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 579         } else {
 580                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 581                         ieee80211_send_nullfunc(local, sdata, 1);
 582
 583                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 584                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 585                         return;
 586
 587                 conf->flags |= IEEE80211_CONF_PS;
 588                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 589         }
 590 }
 591
 592 static void ieee80211_change_ps(struct ieee80211_local *local)
 593 {
 594         struct ieee80211_conf *conf = &local->hw.conf;
 595
 596         if (local->ps_sdata) {
 597                 ieee80211_enable_ps(local, local->ps_sdata);
 598         } else if (conf->flags & IEEE80211_CONF_PS) {
 599                 conf->flags &= ~IEEE80211_CONF_PS;
 600                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 601                 del_timer_sync(&local->dynamic_ps_timer);
 602                 cancel_work_sync(&local->dynamic_ps_enable_work);
 603         }
 604 }
 605
 606 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 607 {
 608         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 609         struct sta_info *sta = NULL;
 610         u32 sta_flags = 0;
 611
 612         if (!mgd->powersave)
 613                 return false;
 614
 615         if (!mgd->associated)
 616                 return false;
 617
 618         if (!mgd->associated->beacon_ies)
 619                 return false;
 620
 621         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 622                           IEEE80211_STA_CONNECTION_POLL))
 623                 return false;
 624
 625         rcu_read_lock();
 626         sta = sta_info_get(sdata, mgd->bssid);
 627         if (sta)
 628                 sta_flags = get_sta_flags(sta);
 629         rcu_read_unlock();
 630
 631         if (!(sta_flags & WLAN_STA_AUTHORIZED))
 632                 return false;
 633
 634         return true;
 635 }
 636
 637 /* need to hold RTNL or interface lock */
 638 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 639 {
 640         struct ieee80211_sub_if_data *sdata, *found = NULL;
 641         int count = 0;
 642         int timeout;
 643
 644         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 645                 local->ps_sdata = NULL;
 646                 return;
 647         }
 648
 649         if (!list_empty(&local->work_list)) {
 650                 local->ps_sdata = NULL;
 651                 goto change;
 652         }
 653
 654         list_for_each_entry(sdata, &local->interfaces, list) {
 655                 if (!ieee80211_sdata_running(sdata))
 656                         continue;
 657                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 658                         /* If an AP vif is found, then disable PS
 659                          * by setting the count to zero thereby setting
 660                          * ps_sdata to NULL.
 661                          */
 662                         count = 0;
 663                         break;
 664                 }
 665                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 666                         continue;
 667                 found = sdata;
 668                 count++;
 669         }
 670
 671         if (count == 1 && ieee80211_powersave_allowed(found)) {
 672                 struct ieee80211_conf *conf = &local->hw.conf;
 673                 s32 beaconint_us;
 674
 675                 if (latency < 0)
 676                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 677
 678                 beaconint_us = ieee80211_tu_to_usec(
 679                                         found->vif.bss_conf.beacon_int);
 680
 681                 timeout = local->dynamic_ps_forced_timeout;
 682                 if (timeout < 0) {
 683                         /*
 684                          * Go to full PSM if the user configures a very low
 685                          * latency requirement.
 686                          * The 2000 second value is there for compatibility
 687                          * until the PM_QOS_NETWORK_LATENCY is configured
 688                          * with real values.
 689                          */
 690                         if (latency > (1900 * USEC_PER_MSEC) &&
 691                             latency != (2000 * USEC_PER_SEC))
 692                                 timeout = 0;
 693                         else
 694                                 timeout = 100;
 695                 }
 696                 local->dynamic_ps_user_timeout = timeout;
 697                 if (!local->disable_dynamic_ps)
 698                         conf->dynamic_ps_timeout =
 699                                 local->dynamic_ps_user_timeout;
 700
 701                 if (beaconint_us > latency) {
 702                         local->ps_sdata = NULL;
 703                 } else {
 704                         struct ieee80211_bss *bss;
 705                         int maxslp = 1;
 706                         u8 dtimper;
 707
 708                         bss = (void *)found->u.mgd.associated->priv;
 709                         dtimper = bss->dtim_period;
 710
 711                         /* If the TIM IE is invalid, pretend the value is 1 */
 712                         if (!dtimper)
 713                                 dtimper = 1;
 714                         else if (dtimper > 1)
 715                                 maxslp = min_t(int, dtimper,
 716                                                     latency / beaconint_us);
 717
 718                         local->hw.conf.max_sleep_period = maxslp;
 719                         local->hw.conf.ps_dtim_period = dtimper;
 720                         local->ps_sdata = found;
 721                 }
 722         } else {
 723                 local->ps_sdata = NULL;
 724         }
 725
 726  change:
 727         ieee80211_change_ps(local);
 728 }
 729
 730 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 731 {
 732         struct ieee80211_local *local =
 733                 container_of(work, struct ieee80211_local,
 734                              dynamic_ps_disable_work);
 735
 736         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 737                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 738                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 739         }
 740
 741         ieee80211_wake_queues_by_reason(&local->hw,
 742                                         IEEE80211_QUEUE_STOP_REASON_PS);
 743 }
 744
 745 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 746 {
 747         struct ieee80211_local *local =
 748                 container_of(work, struct ieee80211_local,
 749                              dynamic_ps_enable_work);
 750         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 751         struct ieee80211_if_managed *ifmgd;
 752         unsigned long flags;
 753         int q;
 754
 755         /* can only happen when PS was just disabled anyway */
 756         if (!sdata)
 757                 return;
 758
 759         ifmgd = &sdata->u.mgd;
 760
 761         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 762                 return;
 763
 764         if (!local->disable_dynamic_ps &&
 765             local->hw.conf.dynamic_ps_timeout > 0) {
 766                 /* don't enter PS if TX frames are pending */
 767                 if (drv_tx_frames_pending(local)) {
 768                         mod_timer(&local->dynamic_ps_timer, jiffies +
 769                                   msecs_to_jiffies(
 770                                   local->hw.conf.dynamic_ps_timeout));
 771                         return;
 772                 }
 773
 774                 /*
 775                  * transmission can be stopped by others which leads to
 776                  * dynamic_ps_timer expiry. Postpone the ps timer if it
 777                  * is not the actual idle state.
 778                  */
 779                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 780                 for (q = 0; q < local->hw.queues; q++) {
 781                         if (local->queue_stop_reasons[q]) {
 782                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
 783                                                        flags);
 784                                 mod_timer(&local->dynamic_ps_timer, jiffies +
 785                                           msecs_to_jiffies(
 786                                           local->hw.conf.dynamic_ps_timeout));
 787                                 return;
 788                         }
 789                 }
 790                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 791         }
 792
 793         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 794             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) {
 795                 netif_tx_stop_all_queues(sdata->dev);
 796
 797                 if (drv_tx_frames_pending(local))
 798                         mod_timer(&local->dynamic_ps_timer, jiffies +
 799                                   msecs_to_jiffies(
 800                                   local->hw.conf.dynamic_ps_timeout));
 801                 else {
 802                         ieee80211_send_nullfunc(local, sdata, 1);
 803                         /* Flush to get the tx status of nullfunc frame */
 804                         drv_flush(local, false);
 805                 }
 806         }
 807
 808         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 809               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 810             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 811                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 812                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 813                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 814         }
 815
 816         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 817                 netif_tx_wake_all_queues(sdata->dev);
 818 }
 819
 820 void ieee80211_dynamic_ps_timer(unsigned long data)
 821 {
 822         struct ieee80211_local *local = (void *) data;
 823
 824         if (local->quiescing || local->suspended)
 825                 return;
 826
 827         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 828 }
 829
 830 /* MLME */
 831 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 832                                      struct ieee80211_sub_if_data *sdata,
 833                                      u8 *wmm_param, size_t wmm_param_len)
 834 {
 835         struct ieee80211_tx_queue_params params;
 836         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 837         size_t left;
 838         int count;
 839         u8 *pos, uapsd_queues = 0;
 840
 841         if (!local->ops->conf_tx)
 842                 return;
 843
 844         if (local->hw.queues < 4)
 845                 return;
 846
 847         if (!wmm_param)
 848                 return;
 849
 850         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 851                 return;
 852
 853         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 854                 uapsd_queues = local->uapsd_queues;
 855
 856         count = wmm_param[6] & 0x0f;
 857         if (count == ifmgd->wmm_last_param_set)
 858                 return;
 859         ifmgd->wmm_last_param_set = count;
 860
 861         pos = wmm_param + 8;
 862         left = wmm_param_len - 8;
 863
 864         memset(&params, 0, sizeof(params));
 865
 866         local->wmm_acm = 0;
 867         for (; left >= 4; left -= 4, pos += 4) {
 868                 int aci = (pos[0] >> 5) & 0x03;
 869                 int acm = (pos[0] >> 4) & 0x01;
 870                 bool uapsd = false;
 871                 int queue;
 872
 873                 switch (aci) {
 874                 case 1: /* AC_BK */
 875                         queue = 3;
 876                         if (acm)
 877                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 878                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 879                                 uapsd = true;
 880                         break;
 881                 case 2: /* AC_VI */
 882                         queue = 1;
 883                         if (acm)
 884                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 885                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 886                                 uapsd = true;
 887                         break;
 888                 case 3: /* AC_VO */
 889                         queue = 0;
 890                         if (acm)
 891                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 892                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 893                                 uapsd = true;
 894                         break;
 895                 case 0: /* AC_BE */
 896                 default:
 897                         queue = 2;
 898                         if (acm)
 899                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 900                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 901                                 uapsd = true;
 902                         break;
 903                 }
 904
 905                 params.aifs = pos[0] & 0x0f;
 906                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 907                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 908                 params.txop = get_unaligned_le16(pos + 2);
 909                 params.uapsd = uapsd;
 910
 911 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 912                 wiphy_debug(local->hw.wiphy,
 913                             "WMM queue=%d aci=%d acm=%d aifs=%d "
 914                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 915                             queue, aci, acm,
 916                             params.aifs, params.cw_min, params.cw_max,
 917                             params.txop, params.uapsd);
 918 #endif
 919                 local->tx_conf[queue] = params;
 920                 if (drv_conf_tx(local, queue, &params))
 921                         wiphy_debug(local->hw.wiphy,
 922                                     "failed to set TX queue parameters for queue %d\n",
 923                                     queue);
 924         }
 925
 926         /* enable WMM or activate new settings */
 927         sdata->vif.bss_conf.qos = true;
 928         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 929 }
 930
 931 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 932                                            u16 capab, bool erp_valid, u8 erp)
 933 {
 934         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 935         u32 changed = 0;
 936         bool use_protection;
 937         bool use_short_preamble;
 938         bool use_short_slot;
 939
 940         if (erp_valid) {
 941                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 942                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 943         } else {
 944                 use_protection = false;
 945                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 946         }
 947
 948         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 949         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 950                 use_short_slot = true;
 951
 952         if (use_protection != bss_conf->use_cts_prot) {
 953                 bss_conf->use_cts_prot = use_protection;
 954                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 955         }
 956
 957         if (use_short_preamble != bss_conf->use_short_preamble) {
 958                 bss_conf->use_short_preamble = use_short_preamble;
 959                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 960         }
 961
 962         if (use_short_slot != bss_conf->use_short_slot) {
 963                 bss_conf->use_short_slot = use_short_slot;
 964                 changed |= BSS_CHANGED_ERP_SLOT;
 965         }
 966
 967         return changed;
 968 }
 969
 970 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 971                                      struct cfg80211_bss *cbss,
 972                                      u32 bss_info_changed)
 973 {
 974         struct ieee80211_bss *bss = (void *)cbss->priv;
 975         struct ieee80211_local *local = sdata->local;
 976         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 977
 978         bss_info_changed |= BSS_CHANGED_ASSOC;
 979         /* set timing information */
 980         bss_conf->beacon_int = cbss->beacon_interval;
 981         bss_conf->timestamp = cbss->tsf;
 982
 983         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 984         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 985                 cbss->capability, bss->has_erp_value, bss->erp_value);
 986
 987         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
 988                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
 989
 990         sdata->u.mgd.associated = cbss;
 991         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 992
 993         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 994
 995         /* just to be sure */
 996         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 997                                 IEEE80211_STA_BEACON_POLL);
 998
 999         ieee80211_led_assoc(local, 1);
1000
1001         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1002                 bss_conf->dtim_period = bss->dtim_period;
1003         else
1004                 bss_conf->dtim_period = 0;
1005
1006         bss_conf->assoc = 1;
1007         /*
1008          * For now just always ask the driver to update the basic rateset
1009          * when we have associated, we aren't checking whether it actually
1010          * changed or not.
1011          */
1012         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
1013
1014         /* And the BSSID changed - we're associated now */
1015         bss_info_changed |= BSS_CHANGED_BSSID;
1016
1017         /* Tell the driver to monitor connection quality (if supported) */
1018         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
1019             bss_conf->cqm_rssi_thold)
1020                 bss_info_changed |= BSS_CHANGED_CQM;
1021
1022         /* Enable ARP filtering */
1023         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1024                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1025                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1026         }
1027
1028         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1029
1030         mutex_lock(&local->iflist_mtx);
1031         ieee80211_recalc_ps(local, -1);
1032         ieee80211_recalc_smps(local);
1033         mutex_unlock(&local->iflist_mtx);
1034
1035         netif_tx_start_all_queues(sdata->dev);
1036         netif_carrier_on(sdata->dev);
1037 }
1038
1039 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1040                                    bool remove_sta, bool tx)
1041 {
1042         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1043         struct ieee80211_local *local = sdata->local;
1044         struct sta_info *sta;
1045         u32 changed = 0, config_changed = 0;
1046         u8 bssid[ETH_ALEN];
1047
1048         ASSERT_MGD_MTX(ifmgd);
1049
1050         if (WARN_ON(!ifmgd->associated))
1051                 return;
1052
1053         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1054
1055         ifmgd->associated = NULL;
1056         memset(ifmgd->bssid, 0, ETH_ALEN);
1057
1058         /*
1059          * we need to commit the associated = NULL change because the
1060          * scan code uses that to determine whether this iface should
1061          * go to/wake up from powersave or not -- and could otherwise
1062          * wake the queues erroneously.
1063          */
1064         smp_mb();
1065
1066         /*
1067          * Thus, we can only afterwards stop the queues -- to account
1068          * for the case where another CPU is finishing a scan at this
1069          * time -- we don't want the scan code to enable queues.
1070          */
1071
1072         netif_tx_stop_all_queues(sdata->dev);
1073         netif_carrier_off(sdata->dev);
1074
1075         mutex_lock(&local->sta_mtx);
1076         sta = sta_info_get(sdata, bssid);
1077         if (sta) {
1078                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
1079                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1080         }
1081         mutex_unlock(&local->sta_mtx);
1082
1083         changed |= ieee80211_reset_erp_info(sdata);
1084
1085         ieee80211_led_assoc(local, 0);
1086         changed |= BSS_CHANGED_ASSOC;
1087         sdata->vif.bss_conf.assoc = false;
1088
1089         ieee80211_set_wmm_default(sdata);
1090
1091         /* channel(_type) changes are handled by ieee80211_hw_config */
1092         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1093
1094         /* on the next assoc, re-program HT parameters */
1095         sdata->ht_opmode_valid = false;
1096
1097         local->power_constr_level = 0;
1098
1099         del_timer_sync(&local->dynamic_ps_timer);
1100         cancel_work_sync(&local->dynamic_ps_enable_work);
1101
1102         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1103                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1104                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1105         }
1106         local->ps_sdata = NULL;
1107
1108         ieee80211_hw_config(local, config_changed);
1109
1110         /* Disable ARP filtering */
1111         if (sdata->vif.bss_conf.arp_filter_enabled) {
1112                 sdata->vif.bss_conf.arp_filter_enabled = false;
1113                 changed |= BSS_CHANGED_ARP_FILTER;
1114         }
1115
1116         /* The BSSID (not really interesting) and HT changed */
1117         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1118         ieee80211_bss_info_change_notify(sdata, changed);
1119
1120         if (remove_sta)
1121                 sta_info_destroy_addr(sdata, bssid);
1122
1123         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1124         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1125         del_timer_sync(&sdata->u.mgd.timer);
1126         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1127 }
1128
1129 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1130                              struct ieee80211_hdr *hdr)
1131 {
1132         /*
1133          * We can postpone the mgd.timer whenever receiving unicast frames
1134          * from AP because we know that the connection is working both ways
1135          * at that time. But multicast frames (and hence also beacons) must
1136          * be ignored here, because we need to trigger the timer during
1137          * data idle periods for sending the periodic probe request to the
1138          * AP we're connected to.
1139          */
1140         if (is_multicast_ether_addr(hdr->addr1))
1141                 return;
1142
1143         ieee80211_sta_reset_conn_monitor(sdata);
1144 }
1145
1146 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1147 {
1148         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1149
1150         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1151                               IEEE80211_STA_CONNECTION_POLL)))
1152             return;
1153
1154         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1155                           IEEE80211_STA_BEACON_POLL);
1156         mutex_lock(&sdata->local->iflist_mtx);
1157         ieee80211_recalc_ps(sdata->local, -1);
1158         mutex_unlock(&sdata->local->iflist_mtx);
1159
1160         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1161                 return;
1162
1163         /*
1164          * We've received a probe response, but are not sure whether
1165          * we have or will be receiving any beacons or data, so let's
1166          * schedule the timers again, just in case.
1167          */
1168         ieee80211_sta_reset_beacon_monitor(sdata);
1169
1170         mod_timer(&ifmgd->conn_mon_timer,
1171                   round_jiffies_up(jiffies +
1172                                    IEEE80211_CONNECTION_IDLE_TIME));
1173 }
1174
1175 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1176                              struct ieee80211_hdr *hdr, bool ack)
1177 {
1178         if (!ieee80211_is_data(hdr->frame_control))
1179             return;
1180
1181         if (ack)
1182                 ieee80211_sta_reset_conn_monitor(sdata);
1183
1184         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1185             sdata->u.mgd.probe_send_count > 0) {
1186                 if (ack)
1187                         sdata->u.mgd.probe_send_count = 0;
1188                 else
1189                         sdata->u.mgd.nullfunc_failed = true;
1190                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1191         }
1192 }
1193
1194 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1195 {
1196         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1197         const u8 *ssid;
1198         u8 *dst = ifmgd->associated->bssid;
1199         u8 unicast_limit = max(1, max_probe_tries - 3);
1200
1201         /*
1202          * Try sending broadcast probe requests for the last three
1203          * probe requests after the first ones failed since some
1204          * buggy APs only support broadcast probe requests.
1205          */
1206         if (ifmgd->probe_send_count >= unicast_limit)
1207                 dst = NULL;
1208
1209         /*
1210          * When the hardware reports an accurate Tx ACK status, it's
1211          * better to send a nullfunc frame instead of a probe request,
1212          * as it will kick us off the AP quickly if we aren't associated
1213          * anymore. The timeout will be reset if the frame is ACKed by
1214          * the AP.
1215          */
1216         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1217                 ifmgd->nullfunc_failed = false;
1218                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1219         } else {
1220                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1221                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0,
1222                                          (u32) -1, true);
1223         }
1224
1225         ifmgd->probe_send_count++;
1226         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1227         run_again(ifmgd, ifmgd->probe_timeout);
1228 }
1229
1230 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1231                                    bool beacon)
1232 {
1233         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1234         bool already = false;
1235
1236         if (!ieee80211_sdata_running(sdata))
1237                 return;
1238
1239         if (sdata->local->scanning)
1240                 return;
1241
1242         if (sdata->local->tmp_channel)
1243                 return;
1244
1245         mutex_lock(&ifmgd->mtx);
1246
1247         if (!ifmgd->associated)
1248                 goto out;
1249
1250 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1251         if (beacon && net_ratelimit())
1252                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1253                        "- sending probe request\n", sdata->name);
1254 #endif
1255
1256         /*
1257          * The driver/our work has already reported this event or the
1258          * connection monitoring has kicked in and we have already sent
1259          * a probe request. Or maybe the AP died and the driver keeps
1260          * reporting until we disassociate...
1261          *
1262          * In either case we have to ignore the current call to this
1263          * function (except for setting the correct probe reason bit)
1264          * because otherwise we would reset the timer every time and
1265          * never check whether we received a probe response!
1266          */
1267         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1268                             IEEE80211_STA_CONNECTION_POLL))
1269                 already = true;
1270
1271         if (beacon)
1272                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1273         else
1274                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1275
1276         if (already)
1277                 goto out;
1278
1279         mutex_lock(&sdata->local->iflist_mtx);
1280         ieee80211_recalc_ps(sdata->local, -1);
1281         mutex_unlock(&sdata->local->iflist_mtx);
1282
1283         ifmgd->probe_send_count = 0;
1284         ieee80211_mgd_probe_ap_send(sdata);
1285  out:
1286         mutex_unlock(&ifmgd->mtx);
1287 }
1288
1289 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1290                                           struct ieee80211_vif *vif)
1291 {
1292         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1293         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1294         struct sk_buff *skb;
1295         const u8 *ssid;
1296
1297         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1298                 return NULL;
1299
1300         ASSERT_MGD_MTX(ifmgd);
1301
1302         if (!ifmgd->associated)
1303                 return NULL;
1304
1305         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1306         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1307                                         (u32) -1, ssid + 2, ssid[1],
1308                                         NULL, 0, true);
1309
1310         return skb;
1311 }
1312 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1313
1314 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1315 {
1316         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1317         struct ieee80211_local *local = sdata->local;
1318         u8 bssid[ETH_ALEN];
1319
1320         mutex_lock(&ifmgd->mtx);
1321         if (!ifmgd->associated) {
1322                 mutex_unlock(&ifmgd->mtx);
1323                 return;
1324         }
1325
1326         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1327
1328         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1329                sdata->name, bssid);
1330
1331         ieee80211_set_disassoc(sdata, true, true);
1332         mutex_unlock(&ifmgd->mtx);
1333
1334         mutex_lock(&local->mtx);
1335         ieee80211_recalc_idle(local);
1336         mutex_unlock(&local->mtx);
1337         /*
1338          * must be outside lock due to cfg80211,
1339          * but that's not a problem.
1340          */
1341         ieee80211_send_deauth_disassoc(sdata, bssid,
1342                                        IEEE80211_STYPE_DEAUTH,
1343                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1344                                        NULL, true);
1345 }
1346
1347 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1348 {
1349         struct ieee80211_sub_if_data *sdata =
1350                 container_of(work, struct ieee80211_sub_if_data,
1351                              u.mgd.beacon_connection_loss_work);
1352
1353         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1354                 __ieee80211_connection_loss(sdata);
1355         else
1356                 ieee80211_mgd_probe_ap(sdata, true);
1357 }
1358
1359 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1360 {
1361         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1362         struct ieee80211_hw *hw = &sdata->local->hw;
1363
1364         trace_api_beacon_loss(sdata);
1365
1366         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1367         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1368 }
1369 EXPORT_SYMBOL(ieee80211_beacon_loss);
1370
1371 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1372 {
1373         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1374         struct ieee80211_hw *hw = &sdata->local->hw;
1375
1376         trace_api_connection_loss(sdata);
1377
1378         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1379         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1380 }
1381 EXPORT_SYMBOL(ieee80211_connection_loss);
1382
1383
1384 static enum rx_mgmt_action __must_check
1385 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1386                          struct ieee80211_mgmt *mgmt, size_t len)
1387 {
1388         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1389         const u8 *bssid = NULL;
1390         u16 reason_code;
1391
1392         if (len < 24 + 2)
1393                 return RX_MGMT_NONE;
1394
1395         ASSERT_MGD_MTX(ifmgd);
1396
1397         bssid = ifmgd->associated->bssid;
1398
1399         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1400
1401         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1402                         sdata->name, bssid, reason_code);
1403
1404         ieee80211_set_disassoc(sdata, true, false);
1405         mutex_lock(&sdata->local->mtx);
1406         ieee80211_recalc_idle(sdata->local);
1407         mutex_unlock(&sdata->local->mtx);
1408
1409         return RX_MGMT_CFG80211_DEAUTH;
1410 }
1411
1412
1413 static enum rx_mgmt_action __must_check
1414 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1415                            struct ieee80211_mgmt *mgmt, size_t len)
1416 {
1417         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1418         u16 reason_code;
1419
1420         if (len < 24 + 2)
1421                 return RX_MGMT_NONE;
1422
1423         ASSERT_MGD_MTX(ifmgd);
1424
1425         if (WARN_ON(!ifmgd->associated))
1426                 return RX_MGMT_NONE;
1427
1428         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1429                 return RX_MGMT_NONE;
1430
1431         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1432
1433         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1434                         sdata->name, mgmt->sa, reason_code);
1435
1436         ieee80211_set_disassoc(sdata, true, false);
1437         mutex_lock(&sdata->local->mtx);
1438         ieee80211_recalc_idle(sdata->local);
1439         mutex_unlock(&sdata->local->mtx);
1440         return RX_MGMT_CFG80211_DISASSOC;
1441 }
1442
1443
1444 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1445                                     struct ieee80211_mgmt *mgmt, size_t len)
1446 {
1447         struct ieee80211_sub_if_data *sdata = wk->sdata;
1448         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1449         struct ieee80211_local *local = sdata->local;
1450         struct ieee80211_supported_band *sband;
1451         struct sta_info *sta;
1452         struct cfg80211_bss *cbss = wk->assoc.bss;
1453         u8 *pos;
1454         u32 rates, basic_rates;
1455         u16 capab_info, aid;
1456         struct ieee802_11_elems elems;
1457         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1458         u32 changed = 0;
1459         int i, j, err;
1460         bool have_higher_than_11mbit = false;
1461         u16 ap_ht_cap_flags;
1462
1463         /* AssocResp and ReassocResp have identical structure */
1464
1465         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1466         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1467
1468         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1469                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1470                        "set\n", sdata->name, aid);
1471         aid &= ~(BIT(15) | BIT(14));
1472
1473         pos = mgmt->u.assoc_resp.variable;
1474         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1475
1476         if (!elems.supp_rates) {
1477                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1478                        sdata->name);
1479                 return false;
1480         }
1481
1482         ifmgd->aid = aid;
1483
1484         mutex_lock(&sdata->local->sta_mtx);
1485         /*
1486          * station info was already allocated and inserted before
1487          * the association and should be available to us
1488          */
1489         sta = sta_info_get_rx(sdata, cbss->bssid);
1490         if (WARN_ON(!sta)) {
1491                 mutex_unlock(&sdata->local->sta_mtx);
1492                 return false;
1493         }
1494
1495         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1496                            WLAN_STA_ASSOC_AP);
1497         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1498                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1499
1500         rates = 0;
1501         basic_rates = 0;
1502         sband = local->hw.wiphy->bands[wk->chan->band];
1503
1504         for (i = 0; i < elems.supp_rates_len; i++) {
1505                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1506                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1507
1508                 if (rate > 110)
1509                         have_higher_than_11mbit = true;
1510
1511                 for (j = 0; j < sband->n_bitrates; j++) {
1512                         if (sband->bitrates[j].bitrate == rate) {
1513                                 rates |= BIT(j);
1514                                 if (is_basic)
1515                                         basic_rates |= BIT(j);
1516                                 break;
1517                         }
1518                 }
1519         }
1520
1521         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1522                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1523                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1524
1525                 if (rate > 110)
1526                         have_higher_than_11mbit = true;
1527
1528                 for (j = 0; j < sband->n_bitrates; j++) {
1529                         if (sband->bitrates[j].bitrate == rate) {
1530                                 rates |= BIT(j);
1531                                 if (is_basic)
1532                                         basic_rates |= BIT(j);
1533                                 break;
1534                         }
1535                 }
1536         }
1537
1538         sta->sta.supp_rates[wk->chan->band] = rates;
1539         sdata->vif.bss_conf.basic_rates = basic_rates;
1540
1541         /* cf. IEEE 802.11 9.2.12 */
1542         if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1543             have_higher_than_11mbit)
1544                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1545         else
1546                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1547
1548         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1549                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1550                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1551
1552         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1553
1554         rate_control_rate_init(sta);
1555
1556         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1557                 set_sta_flags(sta, WLAN_STA_MFP);
1558
1559         if (elems.wmm_param)
1560                 set_sta_flags(sta, WLAN_STA_WME);
1561
1562         /* sta_info_reinsert will also unlock the mutex lock */
1563         err = sta_info_reinsert(sta);
1564         sta = NULL;
1565         if (err) {
1566                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1567                        " the AP (error %d)\n", sdata->name, err);
1568                 return false;
1569         }
1570
1571         /*
1572          * Always handle WMM once after association regardless
1573          * of the first value the AP uses. Setting -1 here has
1574          * that effect because the AP values is an unsigned
1575          * 4-bit value.
1576          */
1577         ifmgd->wmm_last_param_set = -1;
1578
1579         if (elems.wmm_param)
1580                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1581                                          elems.wmm_param_len);
1582         else
1583                 ieee80211_set_wmm_default(sdata);
1584
1585         local->oper_channel = wk->chan;
1586
1587         if (elems.ht_info_elem && elems.wmm_param &&
1588             (sdata->local->hw.queues >= 4) &&
1589             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1590                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1591                                                cbss->bssid, ap_ht_cap_flags);
1592
1593         /* set AID and assoc capability,
1594          * ieee80211_set_associated() will tell the driver */
1595         bss_conf->aid = aid;
1596         bss_conf->assoc_capability = capab_info;
1597         ieee80211_set_associated(sdata, cbss, changed);
1598
1599         /*
1600          * If we're using 4-addr mode, let the AP know that we're
1601          * doing so, so that it can create the STA VLAN on its side
1602          */
1603         if (ifmgd->use_4addr)
1604                 ieee80211_send_4addr_nullfunc(local, sdata);
1605
1606         /*
1607          * Start timer to probe the connection to the AP now.
1608          * Also start the timer that will detect beacon loss.
1609          */
1610         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1611         ieee80211_sta_reset_beacon_monitor(sdata);
1612
1613         return true;
1614 }
1615
1616
1617 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1618                                   struct ieee80211_mgmt *mgmt,
1619                                   size_t len,
1620                                   struct ieee80211_rx_status *rx_status,
1621                                   struct ieee802_11_elems *elems,
1622                                   bool beacon)
1623 {
1624         struct ieee80211_local *local = sdata->local;
1625         int freq;
1626         struct ieee80211_bss *bss;
1627         struct ieee80211_channel *channel;
1628         bool need_ps = false;
1629
1630         if (sdata->u.mgd.associated) {
1631                 bss = (void *)sdata->u.mgd.associated->priv;
1632                 /* not previously set so we may need to recalc */
1633                 need_ps = !bss->dtim_period;
1634         }
1635
1636         if (elems->ds_params && elems->ds_params_len == 1)
1637                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1638                                                       rx_status->band);
1639         else
1640                 freq = rx_status->freq;
1641
1642         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1643
1644         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1645                 return;
1646
1647         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1648                                         channel, beacon);
1649         if (bss)
1650                 ieee80211_rx_bss_put(local, bss);
1651
1652         if (!sdata->u.mgd.associated)
1653                 return;
1654
1655         if (need_ps) {
1656                 mutex_lock(&local->iflist_mtx);
1657                 ieee80211_recalc_ps(local, -1);
1658                 mutex_unlock(&local->iflist_mtx);
1659         }
1660
1661         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1662             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1663                                                         ETH_ALEN) == 0)) {
1664                 struct ieee80211_channel_sw_ie *sw_elem =
1665                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1666                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1667                                                  bss, rx_status->mactime);
1668         }
1669 }
1670
1671
1672 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1673                                          struct sk_buff *skb)
1674 {
1675         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1676         struct ieee80211_if_managed *ifmgd;
1677         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1678         size_t baselen, len = skb->len;
1679         struct ieee802_11_elems elems;
1680
1681         ifmgd = &sdata->u.mgd;
1682
1683         ASSERT_MGD_MTX(ifmgd);
1684
1685         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1686                 return; /* ignore ProbeResp to foreign address */
1687
1688         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1689         if (baselen > len)
1690                 return;
1691
1692         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1693                                 &elems);
1694
1695         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1696
1697         if (ifmgd->associated &&
1698             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1699                 ieee80211_reset_ap_probe(sdata);
1700 }
1701
1702 /*
1703  * This is the canonical list of information elements we care about,
1704  * the filter code also gives us all changes to the Microsoft OUI
1705  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1706  *
1707  * We implement beacon filtering in software since that means we can
1708  * avoid processing the frame here and in cfg80211, and userspace
1709  * will not be able to tell whether the hardware supports it or not.
1710  *
1711  * XXX: This list needs to be dynamic -- userspace needs to be able to
1712  *      add items it requires. It also needs to be able to tell us to
1713  *      look out for other vendor IEs.
1714  */
1715 static const u64 care_about_ies =
1716         (1ULL << WLAN_EID_COUNTRY) |
1717         (1ULL << WLAN_EID_ERP_INFO) |
1718         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1719         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1720         (1ULL << WLAN_EID_HT_CAPABILITY) |
1721         (1ULL << WLAN_EID_HT_INFORMATION);
1722
1723 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1724                                      struct ieee80211_mgmt *mgmt,
1725                                      size_t len,
1726                                      struct ieee80211_rx_status *rx_status)
1727 {
1728         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1729         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1730         size_t baselen;
1731         struct ieee802_11_elems elems;
1732         struct ieee80211_local *local = sdata->local;
1733         u32 changed = 0;
1734         bool erp_valid, directed_tim = false;
1735         u8 erp_value = 0;
1736         u32 ncrc;
1737         u8 *bssid;
1738
1739         ASSERT_MGD_MTX(ifmgd);
1740
1741         /* Process beacon from the current BSS */
1742         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1743         if (baselen > len)
1744                 return;
1745
1746         if (rx_status->freq != local->hw.conf.channel->center_freq)
1747                 return;
1748
1749         /*
1750          * We might have received a number of frames, among them a
1751          * disassoc frame and a beacon...
1752          */
1753         if (!ifmgd->associated)
1754                 return;
1755
1756         bssid = ifmgd->associated->bssid;
1757
1758         /*
1759          * And in theory even frames from a different AP we were just
1760          * associated to a split-second ago!
1761          */
1762         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1763                 return;
1764
1765         /* Track average RSSI from the Beacon frames of the current AP */
1766         ifmgd->last_beacon_signal = rx_status->signal;
1767         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1768                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1769                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1770                 ifmgd->last_cqm_event_signal = 0;
1771                 ifmgd->count_beacon_signal = 1;
1772                 ifmgd->last_ave_beacon_signal = 0;
1773         } else {
1774                 ifmgd->ave_beacon_signal =
1775                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1776                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1777                          ifmgd->ave_beacon_signal) / 16;
1778                 ifmgd->count_beacon_signal++;
1779         }
1780
1781         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
1782             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
1783                 int sig = ifmgd->ave_beacon_signal;
1784                 int last_sig = ifmgd->last_ave_beacon_signal;
1785
1786                 /*
1787                  * if signal crosses either of the boundaries, invoke callback
1788                  * with appropriate parameters
1789                  */
1790                 if (sig > ifmgd->rssi_max_thold &&
1791                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
1792                         ifmgd->last_ave_beacon_signal = sig;
1793                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
1794                 } else if (sig < ifmgd->rssi_min_thold &&
1795                            (last_sig >= ifmgd->rssi_max_thold ||
1796                            last_sig == 0)) {
1797                         ifmgd->last_ave_beacon_signal = sig;
1798                         drv_rssi_callback(local, RSSI_EVENT_LOW);
1799                 }
1800         }
1801
1802         if (bss_conf->cqm_rssi_thold &&
1803             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1804             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1805                 int sig = ifmgd->ave_beacon_signal / 16;
1806                 int last_event = ifmgd->last_cqm_event_signal;
1807                 int thold = bss_conf->cqm_rssi_thold;
1808                 int hyst = bss_conf->cqm_rssi_hyst;
1809                 if (sig < thold &&
1810                     (last_event == 0 || sig < last_event - hyst)) {
1811                         ifmgd->last_cqm_event_signal = sig;
1812                         ieee80211_cqm_rssi_notify(
1813                                 &sdata->vif,
1814                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1815                                 GFP_KERNEL);
1816                 } else if (sig > thold &&
1817                            (last_event == 0 || sig > last_event + hyst)) {
1818                         ifmgd->last_cqm_event_signal = sig;
1819                         ieee80211_cqm_rssi_notify(
1820                                 &sdata->vif,
1821                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1822                                 GFP_KERNEL);
1823                 }
1824         }
1825
1826         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1827 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1828                 if (net_ratelimit()) {
1829                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1830                                "to a received beacon\n", sdata->name);
1831                 }
1832 #endif
1833                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1834                 mutex_lock(&local->iflist_mtx);
1835                 ieee80211_recalc_ps(local, -1);
1836                 mutex_unlock(&local->iflist_mtx);
1837         }
1838
1839         /*
1840          * Push the beacon loss detection into the future since
1841          * we are processing a beacon from the AP just now.
1842          */
1843         ieee80211_sta_reset_beacon_monitor(sdata);
1844
1845         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1846         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1847                                           len - baselen, &elems,
1848                                           care_about_ies, ncrc);
1849
1850         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1851                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1852                                                    ifmgd->aid);
1853
1854         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1855                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1856                                       true);
1857
1858                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1859                                          elems.wmm_param_len);
1860         }
1861
1862         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1863                 if (directed_tim) {
1864                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1865                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1866                                 ieee80211_hw_config(local,
1867                                                     IEEE80211_CONF_CHANGE_PS);
1868                                 ieee80211_send_nullfunc(local, sdata, 0);
1869                         } else {
1870                                 local->pspolling = true;
1871
1872                                 /*
1873                                  * Here is assumed that the driver will be
1874                                  * able to send ps-poll frame and receive a
1875                                  * response even though power save mode is
1876                                  * enabled, but some drivers might require
1877                                  * to disable power save here. This needs
1878                                  * to be investigated.
1879                                  */
1880                                 ieee80211_send_pspoll(local, sdata);
1881                         }
1882                 }
1883         }
1884
1885         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1886                 return;
1887         ifmgd->beacon_crc = ncrc;
1888         ifmgd->beacon_crc_valid = true;
1889
1890         if (elems.erp_info && elems.erp_info_len >= 1) {
1891                 erp_valid = true;
1892                 erp_value = elems.erp_info[0];
1893         } else {
1894                 erp_valid = false;
1895         }
1896         changed |= ieee80211_handle_bss_capability(sdata,
1897                         le16_to_cpu(mgmt->u.beacon.capab_info),
1898                         erp_valid, erp_value);
1899
1900
1901         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1902             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1903                 struct sta_info *sta;
1904                 struct ieee80211_supported_band *sband;
1905                 u16 ap_ht_cap_flags;
1906
1907                 rcu_read_lock();
1908
1909                 sta = sta_info_get(sdata, bssid);
1910                 if (WARN_ON(!sta)) {
1911                         rcu_read_unlock();
1912                         return;
1913                 }
1914
1915                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1916
1917                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1918                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1919
1920                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1921
1922                 rcu_read_unlock();
1923
1924                 /*
1925                  * Whenever the AP announces the HT mode change that can be
1926                  * 40MHz intolerant or etc., it would be safer to stop tx
1927                  * queues before doing hw config to avoid buffer overflow.
1928                  */
1929                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
1930                                 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
1931
1932                 /* flush out all packets */
1933                 synchronize_net();
1934
1935                 drv_flush(local, false);
1936
1937                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1938                                                bssid, ap_ht_cap_flags);
1939
1940                 ieee80211_wake_queues_by_reason(&sdata->local->hw,
1941                                 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
1942         }
1943
1944         /* Note: country IE parsing is done for us by cfg80211 */
1945         if (elems.country_elem) {
1946                 /* TODO: IBSS also needs this */
1947                 if (elems.pwr_constr_elem)
1948                         ieee80211_handle_pwr_constr(sdata,
1949                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1950                                 elems.pwr_constr_elem,
1951                                 elems.pwr_constr_elem_len);
1952         }
1953
1954         ieee80211_bss_info_change_notify(sdata, changed);
1955 }
1956
1957 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1958                                   struct sk_buff *skb)
1959 {
1960         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1961         struct ieee80211_rx_status *rx_status;
1962         struct ieee80211_mgmt *mgmt;
1963         enum rx_mgmt_action rma = RX_MGMT_NONE;
1964         u16 fc;
1965
1966         rx_status = (struct ieee80211_rx_status *) skb->cb;
1967         mgmt = (struct ieee80211_mgmt *) skb->data;
1968         fc = le16_to_cpu(mgmt->frame_control);
1969
1970         mutex_lock(&ifmgd->mtx);
1971
1972         if (ifmgd->associated &&
1973             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1974                 switch (fc & IEEE80211_FCTL_STYPE) {
1975                 case IEEE80211_STYPE_BEACON:
1976                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1977                                                  rx_status);
1978                         break;
1979                 case IEEE80211_STYPE_PROBE_RESP:
1980                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1981                         break;
1982                 case IEEE80211_STYPE_DEAUTH:
1983                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1984                         break;
1985                 case IEEE80211_STYPE_DISASSOC:
1986                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1987                         break;
1988                 case IEEE80211_STYPE_ACTION:
1989                         switch (mgmt->u.action.category) {
1990                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1991                                 ieee80211_sta_process_chanswitch(sdata,
1992                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1993                                                 (void *)ifmgd->associated->priv,
1994                                                 rx_status->mactime);
1995                                 break;
1996                         }
1997                 }
1998                 mutex_unlock(&ifmgd->mtx);
1999
2000                 switch (rma) {
2001                 case RX_MGMT_NONE:
2002                         /* no action */
2003                         break;
2004                 case RX_MGMT_CFG80211_DEAUTH:
2005                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2006                         break;
2007                 case RX_MGMT_CFG80211_DISASSOC:
2008                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2009                         break;
2010                 default:
2011                         WARN(1, "unexpected: %d", rma);
2012                 }
2013                 return;
2014         }
2015
2016         mutex_unlock(&ifmgd->mtx);
2017
2018         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
2019             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
2020                 struct ieee80211_local *local = sdata->local;
2021                 struct ieee80211_work *wk;
2022
2023                 mutex_lock(&local->mtx);
2024                 list_for_each_entry(wk, &local->work_list, list) {
2025                         if (wk->sdata != sdata)
2026                                 continue;
2027
2028                         if (wk->type != IEEE80211_WORK_ASSOC &&
2029                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2030                                 continue;
2031
2032                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
2033                                 continue;
2034                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
2035                                 continue;
2036
2037                         /*
2038                          * Printing the message only here means we can't
2039                          * spuriously print it, but it also means that it
2040                          * won't be printed when the frame comes in before
2041                          * we even tried to associate or in similar cases.
2042                          *
2043                          * Ultimately, I suspect cfg80211 should print the
2044                          * messages instead.
2045                          */
2046                         printk(KERN_DEBUG
2047                                "%s: deauthenticated from %pM (Reason: %u)\n",
2048                                sdata->name, mgmt->bssid,
2049                                le16_to_cpu(mgmt->u.deauth.reason_code));
2050
2051                         list_del_rcu(&wk->list);
2052                         free_work(wk);
2053                         break;
2054                 }
2055                 mutex_unlock(&local->mtx);
2056
2057                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2058         }
2059 }
2060
2061 static void ieee80211_sta_timer(unsigned long data)
2062 {
2063         struct ieee80211_sub_if_data *sdata =
2064                 (struct ieee80211_sub_if_data *) data;
2065         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2066         struct ieee80211_local *local = sdata->local;
2067
2068         if (local->quiescing) {
2069                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2070                 return;
2071         }
2072
2073         ieee80211_queue_work(&local->hw, &sdata->work);
2074 }
2075
2076 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2077                                           u8 *bssid, u8 reason)
2078 {
2079         struct ieee80211_local *local = sdata->local;
2080         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2081
2082         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2083                           IEEE80211_STA_BEACON_POLL);
2084
2085         ieee80211_set_disassoc(sdata, true, true);
2086         mutex_unlock(&ifmgd->mtx);
2087         mutex_lock(&local->mtx);
2088         ieee80211_recalc_idle(local);
2089         mutex_unlock(&local->mtx);
2090         /*
2091          * must be outside lock due to cfg80211,
2092          * but that's not a problem.
2093          */
2094         ieee80211_send_deauth_disassoc(sdata, bssid,
2095                         IEEE80211_STYPE_DEAUTH, reason,
2096                         NULL, true);
2097         mutex_lock(&ifmgd->mtx);
2098 }
2099
2100 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2101 {
2102         struct ieee80211_local *local = sdata->local;
2103         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2104
2105         /* then process the rest of the work */
2106         mutex_lock(&ifmgd->mtx);
2107
2108         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2109                             IEEE80211_STA_CONNECTION_POLL) &&
2110             ifmgd->associated) {
2111                 u8 bssid[ETH_ALEN];
2112                 int max_tries;
2113
2114                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2115
2116                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2117                         max_tries = max_nullfunc_tries;
2118                 else
2119                         max_tries = max_probe_tries;
2120
2121                 /* ACK received for nullfunc probing frame */
2122                 if (!ifmgd->probe_send_count)
2123                         ieee80211_reset_ap_probe(sdata);
2124                 else if (ifmgd->nullfunc_failed) {
2125                         if (ifmgd->probe_send_count < max_tries) {
2126 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2127                                 wiphy_debug(local->hw.wiphy,
2128                                             "%s: No ack for nullfunc frame to"
2129                                             " AP %pM, try %d/%i\n",
2130                                             sdata->name, bssid,
2131                                             ifmgd->probe_send_count, max_tries);
2132 #endif
2133                                 ieee80211_mgd_probe_ap_send(sdata);
2134                         } else {
2135 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2136                                 wiphy_debug(local->hw.wiphy,
2137                                             "%s: No ack for nullfunc frame to"
2138                                             " AP %pM, disconnecting.\n",
2139                                             sdata->name, bssid);
2140 #endif
2141                                 ieee80211_sta_connection_lost(sdata, bssid,
2142                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2143                         }
2144                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2145                         run_again(ifmgd, ifmgd->probe_timeout);
2146                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2147 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2148                         wiphy_debug(local->hw.wiphy,
2149                                     "%s: Failed to send nullfunc to AP %pM"
2150                                     " after %dms, disconnecting.\n",
2151                                     sdata->name,
2152                                     bssid, probe_wait_ms);
2153 #endif
2154                         ieee80211_sta_connection_lost(sdata, bssid,
2155                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2156                 } else if (ifmgd->probe_send_count < max_tries) {
2157 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2158                         wiphy_debug(local->hw.wiphy,
2159                                     "%s: No probe response from AP %pM"
2160                                     " after %dms, try %d/%i\n",
2161                                     sdata->name,
2162                                     bssid, probe_wait_ms,
2163                                     ifmgd->probe_send_count, max_tries);
2164 #endif
2165                         ieee80211_mgd_probe_ap_send(sdata);
2166                 } else {
2167                         /*
2168                          * We actually lost the connection ... or did we?
2169                          * Let's make sure!
2170                          */
2171                         wiphy_debug(local->hw.wiphy,
2172                                     "%s: No probe response from AP %pM"
2173                                     " after %dms, disconnecting.\n",
2174                                     sdata->name,
2175                                     bssid, probe_wait_ms);
2176
2177                         ieee80211_sta_connection_lost(sdata, bssid,
2178                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2179                 }
2180         }
2181
2182         mutex_unlock(&ifmgd->mtx);
2183 }
2184
2185 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2186 {
2187         struct ieee80211_sub_if_data *sdata =
2188                 (struct ieee80211_sub_if_data *) data;
2189         struct ieee80211_local *local = sdata->local;
2190
2191         if (local->quiescing)
2192                 return;
2193
2194         ieee80211_queue_work(&sdata->local->hw,
2195                              &sdata->u.mgd.beacon_connection_loss_work);
2196 }
2197
2198 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2199 {
2200         struct ieee80211_sub_if_data *sdata =
2201                 (struct ieee80211_sub_if_data *) data;
2202         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2203         struct ieee80211_local *local = sdata->local;
2204
2205         if (local->quiescing)
2206                 return;
2207
2208         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2209 }
2210
2211 static void ieee80211_sta_monitor_work(struct work_struct *work)
2212 {
2213         struct ieee80211_sub_if_data *sdata =
2214                 container_of(work, struct ieee80211_sub_if_data,
2215                              u.mgd.monitor_work);
2216
2217         ieee80211_mgd_probe_ap(sdata, false);
2218 }
2219
2220 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2221 {
2222         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2223                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2224                                         IEEE80211_STA_CONNECTION_POLL);
2225
2226                 /* let's probe the connection once */
2227                 ieee80211_queue_work(&sdata->local->hw,
2228                            &sdata->u.mgd.monitor_work);
2229                 /* and do all the other regular work too */
2230                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2231         }
2232 }
2233
2234 #ifdef CONFIG_PM
2235 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2236 {
2237         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2238
2239         /*
2240          * we need to use atomic bitops for the running bits
2241          * only because both timers might fire at the same
2242          * time -- the code here is properly synchronised.
2243          */
2244
2245         cancel_work_sync(&ifmgd->request_smps_work);
2246
2247         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2248         if (del_timer_sync(&ifmgd->timer))
2249                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2250
2251         cancel_work_sync(&ifmgd->chswitch_work);
2252         if (del_timer_sync(&ifmgd->chswitch_timer))
2253                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2254
2255         cancel_work_sync(&ifmgd->monitor_work);
2256         /* these will just be re-established on connection */
2257         del_timer_sync(&ifmgd->conn_mon_timer);
2258         del_timer_sync(&ifmgd->bcn_mon_timer);
2259 }
2260
2261 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2262 {
2263         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2264
2265         if (!ifmgd->associated)
2266                 return;
2267
2268         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2269                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2270                 mutex_lock(&ifmgd->mtx);
2271                 if (ifmgd->associated) {
2272 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2273                         wiphy_debug(sdata->local->hw.wiphy,
2274                                     "%s: driver requested disconnect after resume.\n",
2275                                     sdata->name);
2276 #endif
2277                         ieee80211_sta_connection_lost(sdata,
2278                                 ifmgd->associated->bssid,
2279                                 WLAN_REASON_UNSPECIFIED);
2280                         mutex_unlock(&ifmgd->mtx);
2281                         return;
2282                 }
2283                 mutex_unlock(&ifmgd->mtx);
2284         }
2285
2286         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2287                 add_timer(&ifmgd->timer);
2288         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2289                 add_timer(&ifmgd->chswitch_timer);
2290         ieee80211_sta_reset_beacon_monitor(sdata);
2291         ieee80211_restart_sta_timer(sdata);
2292         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.monitor_work);
2293 }
2294 #endif
2295
2296 /* interface setup */
2297 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2298 {
2299         struct ieee80211_if_managed *ifmgd;
2300
2301         ifmgd = &sdata->u.mgd;
2302         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2303         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2304         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2305                   ieee80211_beacon_connection_loss_work);
2306         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2307         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2308                     (unsigned long) sdata);
2309         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2310                     (unsigned long) sdata);
2311         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2312                     (unsigned long) sdata);
2313         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2314                     (unsigned long) sdata);
2315
2316         ifmgd->flags = 0;
2317
2318         mutex_init(&ifmgd->mtx);
2319
2320         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2321                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2322         else
2323                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2324 }
2325
2326 /* scan finished notification */
2327 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2328 {
2329         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2330
2331         /* Restart STA timers */
2332         rcu_read_lock();
2333         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2334                 ieee80211_restart_sta_timer(sdata);
2335         rcu_read_unlock();
2336 }
2337
2338 int ieee80211_max_network_latency(struct notifier_block *nb,
2339                                   unsigned long data, void *dummy)
2340 {
2341         s32 latency_usec = (s32) data;
2342         struct ieee80211_local *local =
2343                 container_of(nb, struct ieee80211_local,
2344                              network_latency_notifier);
2345
2346         mutex_lock(&local->iflist_mtx);
2347         ieee80211_recalc_ps(local, latency_usec);
2348         mutex_unlock(&local->iflist_mtx);
2349
2350         return 0;
2351 }
2352
2353 /* config hooks */
2354 static enum work_done_result
2355 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2356                           struct sk_buff *skb)
2357 {
2358         struct ieee80211_local *local = wk->sdata->local;
2359
2360         if (!skb) {
2361                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2362                 goto destroy;
2363         }
2364
2365         if (wk->type == IEEE80211_WORK_AUTH) {
2366                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2367                 goto destroy;
2368         }
2369
2370         mutex_lock(&wk->sdata->u.mgd.mtx);
2371         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2372         mutex_unlock(&wk->sdata->u.mgd.mtx);
2373
2374         wk->type = IEEE80211_WORK_AUTH;
2375         wk->probe_auth.tries = 0;
2376         return WORK_DONE_REQUEUE;
2377  destroy:
2378         if (wk->probe_auth.synced)
2379                 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2380                                    IEEE80211_TX_SYNC_AUTH);
2381
2382         return WORK_DONE_DESTROY;
2383 }
2384
2385 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2386                        struct cfg80211_auth_request *req)
2387 {
2388         const u8 *ssid;
2389         struct ieee80211_work *wk;
2390         u16 auth_alg;
2391
2392         if (req->local_state_change)
2393                 return 0; /* no need to update mac80211 state */
2394
2395         switch (req->auth_type) {
2396         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2397                 auth_alg = WLAN_AUTH_OPEN;
2398                 break;
2399         case NL80211_AUTHTYPE_SHARED_KEY:
2400                 if (IS_ERR(sdata->local->wep_tx_tfm))
2401                         return -EOPNOTSUPP;
2402                 auth_alg = WLAN_AUTH_SHARED_KEY;
2403                 break;
2404         case NL80211_AUTHTYPE_FT:
2405                 auth_alg = WLAN_AUTH_FT;
2406                 break;
2407         case NL80211_AUTHTYPE_NETWORK_EAP:
2408                 auth_alg = WLAN_AUTH_LEAP;
2409                 break;
2410         default:
2411                 return -EOPNOTSUPP;
2412         }
2413
2414         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2415         if (!wk)
2416                 return -ENOMEM;
2417
2418         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2419
2420         if (req->ie && req->ie_len) {
2421                 memcpy(wk->ie, req->ie, req->ie_len);
2422                 wk->ie_len = req->ie_len;
2423         }
2424
2425         if (req->key && req->key_len) {
2426                 wk->probe_auth.key_len = req->key_len;
2427                 wk->probe_auth.key_idx = req->key_idx;
2428                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2429         }
2430
2431         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2432         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2433         wk->probe_auth.ssid_len = ssid[1];
2434
2435         wk->probe_auth.algorithm = auth_alg;
2436         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2437
2438         /* if we already have a probe, don't probe again */
2439         if (req->bss->proberesp_ies)
2440                 wk->type = IEEE80211_WORK_AUTH;
2441         else
2442                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2443         wk->chan = req->bss->channel;
2444         wk->chan_type = NL80211_CHAN_NO_HT;
2445         wk->sdata = sdata;
2446         wk->done = ieee80211_probe_auth_done;
2447
2448         ieee80211_add_work(wk);
2449         return 0;
2450 }
2451
2452 /* create and insert a dummy station entry */
2453 static int ieee80211_pre_assoc(struct ieee80211_sub_if_data *sdata,
2454                                 u8 *bssid) {
2455         struct sta_info *sta;
2456         int err;
2457
2458         sta = sta_info_alloc(sdata, bssid, GFP_KERNEL);
2459         if (!sta)
2460                 return -ENOMEM;
2461
2462         sta->dummy = true;
2463
2464         err = sta_info_insert(sta);
2465         sta = NULL;
2466         if (err) {
2467                 printk(KERN_DEBUG "%s: failed to insert Dummy STA entry for"
2468                        " the AP (error %d)\n", sdata->name, err);
2469                 return err;
2470         }
2471
2472         return 0;
2473 }
2474
2475 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2476                                                   struct sk_buff *skb)
2477 {
2478         struct ieee80211_local *local = wk->sdata->local;
2479         struct ieee80211_mgmt *mgmt;
2480         struct ieee80211_rx_status *rx_status;
2481         struct ieee802_11_elems elems;
2482         struct cfg80211_bss *cbss = wk->assoc.bss;
2483         u16 status;
2484
2485         if (!skb) {
2486                 sta_info_destroy_addr(wk->sdata, cbss->bssid);
2487                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2488                 goto destroy;
2489         }
2490
2491         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2492                 mutex_lock(&wk->sdata->u.mgd.mtx);
2493                 rx_status = (void *) skb->cb;
2494                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2495                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2496                                       &elems, true);
2497                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2498
2499                 wk->type = IEEE80211_WORK_ASSOC;
2500                 /* not really done yet */
2501                 return WORK_DONE_REQUEUE;
2502         }
2503
2504         mgmt = (void *)skb->data;
2505         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2506
2507         if (status == WLAN_STATUS_SUCCESS) {
2508                 if (wk->assoc.synced)
2509                         drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2510                                            IEEE80211_TX_SYNC_ASSOC);
2511
2512                 mutex_lock(&wk->sdata->u.mgd.mtx);
2513                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2514                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2515                         /* oops -- internal error -- send timeout for now */
2516                         sta_info_destroy_addr(wk->sdata, cbss->bssid);
2517                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2518                                                     wk->filter_ta);
2519                         return WORK_DONE_DESTROY;
2520                 }
2521
2522                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2523         } else {
2524                 /* assoc failed - destroy the dummy station entry */
2525                 sta_info_destroy_addr(wk->sdata, cbss->bssid);
2526         }
2527
2528         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2529  destroy:
2530         if (wk->assoc.synced)
2531                 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2532                                    IEEE80211_TX_SYNC_ASSOC);
2533
2534         return WORK_DONE_DESTROY;
2535 }
2536
2537 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2538                         struct cfg80211_assoc_request *req)
2539 {
2540         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2541         struct ieee80211_bss *bss = (void *)req->bss->priv;
2542         struct ieee80211_work *wk;
2543         const u8 *ssid;
2544         int i, err;
2545
2546         mutex_lock(&ifmgd->mtx);
2547         if (ifmgd->associated) {
2548                 if (!req->prev_bssid ||
2549                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2550                            ETH_ALEN)) {
2551                         /*
2552                          * We are already associated and the request was not a
2553                          * reassociation request from the current BSS, so
2554                          * reject it.
2555                          */
2556                         mutex_unlock(&ifmgd->mtx);
2557                         return -EALREADY;
2558                 }
2559
2560                 /* Trying to reassociate - clear previous association state */
2561                 ieee80211_set_disassoc(sdata, true, false);
2562         }
2563         mutex_unlock(&ifmgd->mtx);
2564
2565         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2566         if (!wk)
2567                 return -ENOMEM;
2568
2569         /*
2570          * create a dummy station info entry in order
2571          * to start accepting incoming EAPOL packets from the station
2572          */
2573         err = ieee80211_pre_assoc(sdata, req->bss->bssid);
2574         if (err) {
2575                 kfree(wk);
2576                 return err;
2577         }
2578
2579         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2580         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2581
2582         ifmgd->beacon_crc_valid = false;
2583
2584         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2585                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2586                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2587                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2588                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2589
2590
2591         if (req->ie && req->ie_len) {
2592                 memcpy(wk->ie, req->ie, req->ie_len);
2593                 wk->ie_len = req->ie_len;
2594         } else
2595                 wk->ie_len = 0;
2596
2597         wk->assoc.bss = req->bss;
2598
2599         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2600
2601         /* new association always uses requested smps mode */
2602         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2603                 if (ifmgd->powersave)
2604                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2605                 else
2606                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2607         } else
2608                 ifmgd->ap_smps = ifmgd->req_smps;
2609
2610         wk->assoc.smps = ifmgd->ap_smps;
2611         /*
2612          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2613          * We still associate in non-HT mode (11a/b/g) if any one of these
2614          * ciphers is configured as pairwise.
2615          * We can set this to true for non-11n hardware, that'll be checked
2616          * separately along with the peer capabilities.
2617          */
2618         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2619         wk->assoc.capability = req->bss->capability;
2620         wk->assoc.wmm_used = bss->wmm_used;
2621         wk->assoc.supp_rates = bss->supp_rates;
2622         wk->assoc.supp_rates_len = bss->supp_rates_len;
2623         wk->assoc.ht_information_ie =
2624                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2625
2626         if (bss->wmm_used && bss->uapsd_supported &&
2627             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2628                 wk->assoc.uapsd_used = true;
2629                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2630         } else {
2631                 wk->assoc.uapsd_used = false;
2632                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2633         }
2634
2635         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2636         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2637         wk->assoc.ssid_len = ssid[1];
2638
2639         if (req->prev_bssid)
2640                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2641
2642         wk->chan = req->bss->channel;
2643         wk->chan_type = NL80211_CHAN_NO_HT;
2644         wk->sdata = sdata;
2645         wk->done = ieee80211_assoc_done;
2646         if (!bss->dtim_period &&
2647             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2648                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2649         else
2650                 wk->type = IEEE80211_WORK_ASSOC;
2651
2652         if (req->use_mfp) {
2653                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2654                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2655         } else {
2656                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2657                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2658         }
2659
2660         if (req->crypto.control_port)
2661                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2662         else
2663                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2664
2665         sdata->control_port_protocol = req->crypto.control_port_ethertype;
2666         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2667
2668         ieee80211_add_work(wk);
2669         return 0;
2670 }
2671
2672 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2673                          struct cfg80211_deauth_request *req,
2674                          void *cookie)
2675 {
2676         struct ieee80211_local *local = sdata->local;
2677         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2678         struct ieee80211_work *wk;
2679         u8 bssid[ETH_ALEN];
2680         bool assoc_bss = false;
2681
2682         mutex_lock(&ifmgd->mtx);
2683
2684         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2685         if (ifmgd->associated == req->bss) {
2686                 ieee80211_set_disassoc(sdata, false, true);
2687                 mutex_unlock(&ifmgd->mtx);
2688                 assoc_bss = true;
2689         } else {
2690                 bool not_auth_yet = false;
2691
2692                 mutex_unlock(&ifmgd->mtx);
2693
2694                 mutex_lock(&local->mtx);
2695                 list_for_each_entry(wk, &local->work_list, list) {
2696                         if (wk->sdata != sdata)
2697                                 continue;
2698
2699                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2700                             wk->type != IEEE80211_WORK_AUTH &&
2701                             wk->type != IEEE80211_WORK_ASSOC &&
2702                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2703                                 continue;
2704
2705                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2706                                 continue;
2707
2708                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2709                         list_del_rcu(&wk->list);
2710                         free_work(wk);
2711                         break;
2712                 }
2713                 mutex_unlock(&local->mtx);
2714
2715                 /*
2716                  * If somebody requests authentication and we haven't
2717                  * sent out an auth frame yet there's no need to send
2718                  * out a deauth frame either. If the state was PROBE,
2719                  * then this is the case. If it's AUTH we have sent a
2720                  * frame, and if it's IDLE we have completed the auth
2721                  * process already.
2722                  */
2723                 if (not_auth_yet) {
2724                         __cfg80211_auth_canceled(sdata->dev, bssid);
2725                         return 0;
2726                 }
2727         }
2728
2729         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2730                sdata->name, bssid, req->reason_code);
2731
2732         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2733                                        req->reason_code, cookie,
2734                                        !req->local_state_change);
2735         if (assoc_bss)
2736                 sta_info_destroy_addr(sdata, bssid);
2737
2738         mutex_lock(&sdata->local->mtx);
2739         ieee80211_recalc_idle(sdata->local);
2740         mutex_unlock(&sdata->local->mtx);
2741
2742         return 0;
2743 }
2744
2745 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2746                            struct cfg80211_disassoc_request *req,
2747                            void *cookie)
2748 {
2749         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2750         u8 bssid[ETH_ALEN];
2751
2752         mutex_lock(&ifmgd->mtx);
2753
2754         /*
2755          * cfg80211 should catch this ... but it's racy since
2756          * we can receive a disassoc frame, process it, hand it
2757          * to cfg80211 while that's in a locked section already
2758          * trying to tell us that the user wants to disconnect.
2759          */
2760         if (ifmgd->associated != req->bss) {
2761                 mutex_unlock(&ifmgd->mtx);
2762                 return -ENOLINK;
2763         }
2764
2765         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2766                sdata->name, req->bss->bssid, req->reason_code);
2767
2768         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2769         ieee80211_set_disassoc(sdata, false, true);
2770
2771         mutex_unlock(&ifmgd->mtx);
2772
2773         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2774                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2775                         cookie, !req->local_state_change);
2776         sta_info_destroy_addr(sdata, bssid);
2777
2778         mutex_lock(&sdata->local->mtx);
2779         ieee80211_recalc_idle(sdata->local);
2780         mutex_unlock(&sdata->local->mtx);
2781
2782         return 0;
2783 }
2784
2785 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2786                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2787                                gfp_t gfp)
2788 {
2789         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2790
2791         trace_api_cqm_rssi_notify(sdata, rssi_event);
2792
2793         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2794 }
2795 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
2796
2797 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
2798 {
2799         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2800         return sdata->dev->operstate;
2801 }
2802 EXPORT_SYMBOL(ieee80211_get_operstate);