net/mac80211/mlme.c

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