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 #define IEEE80211_MAX_NULLFUNC_TRIES 2
  32 #define IEEE80211_MAX_PROBE_TRIES 5
  33
  34 /*
  35  * Beacon loss timeout is calculated as N frames times the
  36  * advertised beacon interval.  This may need to be somewhat
  37  * higher than what hardware might detect to account for
  38  * delays in the host processing frames. But since we also
  39  * probe on beacon miss before declaring the connection lost
  40  * default to what we want.
  41  */
  42 #define IEEE80211_BEACON_LOSS_COUNT     7
  43
  44 /*
  45  * Time the connection can be idle before we probe
  46  * it to see if we can still talk to the AP.
  47  */
  48 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  49 /*
  50  * Time we wait for a probe response after sending
  51  * a probe request because of beacon loss or for
  52  * checking the connection still works.
  53  */
  54 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  55
  56 /*
  57  * Weight given to the latest Beacon frame when calculating average signal
  58  * strength for Beacon frames received in the current BSS. This must be
  59  * between 1 and 15.
  60  */
  61 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  62
  63 /*
  64  * How many Beacon frames need to have been used in average signal strength
  65  * before starting to indicate signal change events.
  66  */
  67 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  68
  69 #define TMR_RUNNING_TIMER       0
  70 #define TMR_RUNNING_CHANSW      1
  71
  72 /*
  73  * All cfg80211 functions have to be called outside a locked
  74  * section so that they can acquire a lock themselves... This
  75  * is much simpler than queuing up things in cfg80211, but we
  76  * do need some indirection for that here.
  77  */
  78 enum rx_mgmt_action {
  79         /* no action required */
  80         RX_MGMT_NONE,
  81
  82         /* caller must call cfg80211_send_rx_auth() */
  83         RX_MGMT_CFG80211_AUTH,
  84
  85         /* caller must call cfg80211_send_rx_assoc() */
  86         RX_MGMT_CFG80211_ASSOC,
  87
  88         /* caller must call cfg80211_send_deauth() */
  89         RX_MGMT_CFG80211_DEAUTH,
  90
  91         /* caller must call cfg80211_send_disassoc() */
  92         RX_MGMT_CFG80211_DISASSOC,
  93
  94         /* caller must tell cfg80211 about internal error */
  95         RX_MGMT_CFG80211_ASSOC_ERROR,
  96 };
  97
  98 /* utils */
  99 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 100 {
 101         lockdep_assert_held(&ifmgd->mtx);
 102 }
 103
 104 /*
 105  * We can have multiple work items (and connection probing)
 106  * scheduling this timer, but we need to take care to only
 107  * reschedule it when it should fire _earlier_ than it was
 108  * asked for before, or if it's not pending right now. This
 109  * function ensures that. Note that it then is required to
 110  * run this function for all timeouts after the first one
 111  * has happened -- the work that runs from this timer will
 112  * do that.
 113  */
 114 static void run_again(struct ieee80211_if_managed *ifmgd,
 115                              unsigned long timeout)
 116 {
 117         ASSERT_MGD_MTX(ifmgd);
 118
 119         if (!timer_pending(&ifmgd->timer) ||
 120             time_before(timeout, ifmgd->timer.expires))
 121                 mod_timer(&ifmgd->timer, timeout);
 122 }
 123
 124 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 125 {
 126         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 127                 return;
 128
 129         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 130                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 131 }
 132
 133 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 134 {
 135         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 136
 137         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 138                 return;
 139
 140         mod_timer(&sdata->u.mgd.conn_mon_timer,
 141                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 142
 143         ifmgd->probe_send_count = 0;
 144 }
 145
 146 static int ecw2cw(int ecw)
 147 {
 148         return (1 << ecw) - 1;
 149 }
 150
 151 /*
 152  * ieee80211_enable_ht should be called only after the operating band
 153  * has been determined as ht configuration depends on the hw's
 154  * HT abilities for a specific band.
 155  */
 156 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 157                                struct ieee80211_ht_info *hti,
 158                                const u8 *bssid, u16 ap_ht_cap_flags)
 159 {
 160         struct ieee80211_local *local = sdata->local;
 161         struct ieee80211_supported_band *sband;
 162         struct sta_info *sta;
 163         u32 changed = 0;
 164         u16 ht_opmode;
 165         bool enable_ht = true;
 166         enum nl80211_channel_type prev_chantype;
 167         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 168
 169         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 170
 171         prev_chantype = sdata->vif.bss_conf.channel_type;
 172
 173         /* HT is not supported */
 174         if (!sband->ht_cap.ht_supported)
 175                 enable_ht = false;
 176
 177         /* check that channel matches the right operating channel */
 178         if (local->hw.conf.channel->center_freq !=
 179             ieee80211_channel_to_frequency(hti->control_chan))
 180                 enable_ht = false;
 181
 182         if (enable_ht) {
 183                 channel_type = NL80211_CHAN_HT20;
 184
 185                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 186                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 187                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 188                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 189                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 190                                 if (!(local->hw.conf.channel->flags &
 191                                     IEEE80211_CHAN_NO_HT40PLUS))
 192                                         channel_type = NL80211_CHAN_HT40PLUS;
 193                                 break;
 194                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 195                                 if (!(local->hw.conf.channel->flags &
 196                                     IEEE80211_CHAN_NO_HT40MINUS))
 197                                         channel_type = NL80211_CHAN_HT40MINUS;
 198                                 break;
 199                         }
 200                 }
 201         }
 202
 203         if (local->tmp_channel)
 204                 local->tmp_channel_type = channel_type;
 205
 206         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 207                 /* can only fail due to HT40+/- mismatch */
 208                 channel_type = NL80211_CHAN_HT20;
 209                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 210         }
 211
 212         /* channel_type change automatically detected */
 213         ieee80211_hw_config(local, 0);
 214
 215         if (prev_chantype != channel_type) {
 216                 rcu_read_lock();
 217                 sta = sta_info_get(sdata, bssid);
 218                 if (sta)
 219                         rate_control_rate_update(local, sband, sta,
 220                                                  IEEE80211_RC_HT_CHANGED,
 221                                                  channel_type);
 222                 rcu_read_unlock();
 223         }
 224
 225         ht_opmode = le16_to_cpu(hti->operation_mode);
 226
 227         /* if bss configuration changed store the new one */
 228         if (sdata->ht_opmode_valid != enable_ht ||
 229             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 230             prev_chantype != channel_type) {
 231                 changed |= BSS_CHANGED_HT;
 232                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 233                 sdata->ht_opmode_valid = enable_ht;
 234         }
 235
 236         return changed;
 237 }
 238
 239 /* frame sending functions */
 240
 241 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 242                                            const u8 *bssid, u16 stype, u16 reason,
 243                                            void *cookie, bool send_frame)
 244 {
 245         struct ieee80211_local *local = sdata->local;
 246         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 247         struct sk_buff *skb;
 248         struct ieee80211_mgmt *mgmt;
 249
 250         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 251         if (!skb) {
 252                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 253                        "deauth/disassoc frame\n", sdata->name);
 254                 return;
 255         }
 256         skb_reserve(skb, local->hw.extra_tx_headroom);
 257
 258         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 259         memset(mgmt, 0, 24);
 260         memcpy(mgmt->da, bssid, ETH_ALEN);
 261         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 262         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 263         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 264         skb_put(skb, 2);
 265         /* u.deauth.reason_code == u.disassoc.reason_code */
 266         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 267
 268         if (stype == IEEE80211_STYPE_DEAUTH)
 269                 if (cookie)
 270                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 271                 else
 272                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 273         else
 274                 if (cookie)
 275                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 276                 else
 277                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 278         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 279                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 280
 281         if (send_frame)
 282                 ieee80211_tx_skb(sdata, skb);
 283         else
 284                 kfree_skb(skb);
 285 }
 286
 287 void ieee80211_send_pspoll(struct ieee80211_local *local,
 288                            struct ieee80211_sub_if_data *sdata)
 289 {
 290         struct ieee80211_pspoll *pspoll;
 291         struct sk_buff *skb;
 292
 293         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 294         if (!skb)
 295                 return;
 296
 297         pspoll = (struct ieee80211_pspoll *) skb->data;
 298         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 299
 300         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 301         ieee80211_tx_skb(sdata, skb);
 302 }
 303
 304 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 305                              struct ieee80211_sub_if_data *sdata,
 306                              int powersave)
 307 {
 308         struct sk_buff *skb;
 309         struct ieee80211_hdr_3addr *nullfunc;
 310
 311         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 312         if (!skb)
 313                 return;
 314
 315         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 316         if (powersave)
 317                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 318
 319         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 320         ieee80211_tx_skb(sdata, skb);
 321 }
 322
 323 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 324                                           struct ieee80211_sub_if_data *sdata)
 325 {
 326         struct sk_buff *skb;
 327         struct ieee80211_hdr *nullfunc;
 328         __le16 fc;
 329
 330         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 331                 return;
 332
 333         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 334         if (!skb) {
 335                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 336                        "nullfunc frame\n", sdata->name);
 337                 return;
 338         }
 339         skb_reserve(skb, local->hw.extra_tx_headroom);
 340
 341         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 342         memset(nullfunc, 0, 30);
 343         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 344                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 345         nullfunc->frame_control = fc;
 346         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 347         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 348         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 349         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 350
 351         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 352         ieee80211_tx_skb(sdata, skb);
 353 }
 354
 355 /* spectrum management related things */
 356 static void ieee80211_chswitch_work(struct work_struct *work)
 357 {
 358         struct ieee80211_sub_if_data *sdata =
 359                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 360         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 361
 362         if (!ieee80211_sdata_running(sdata))
 363                 return;
 364
 365         mutex_lock(&ifmgd->mtx);
 366         if (!ifmgd->associated)
 367                 goto out;
 368
 369         sdata->local->oper_channel = sdata->local->csa_channel;
 370         if (!sdata->local->ops->channel_switch) {
 371                 /* call "hw_config" only if doing sw channel switch */
 372                 ieee80211_hw_config(sdata->local,
 373                         IEEE80211_CONF_CHANGE_CHANNEL);
 374         }
 375
 376         /* XXX: shouldn't really modify cfg80211-owned data! */
 377         ifmgd->associated->channel = sdata->local->oper_channel;
 378
 379         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 380                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 381  out:
 382         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 383         mutex_unlock(&ifmgd->mtx);
 384 }
 385
 386 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 387 {
 388         struct ieee80211_sub_if_data *sdata;
 389         struct ieee80211_if_managed *ifmgd;
 390
 391         sdata = vif_to_sdata(vif);
 392         ifmgd = &sdata->u.mgd;
 393
 394         trace_api_chswitch_done(sdata, success);
 395         if (!success) {
 396                 /*
 397                  * If the channel switch was not successful, stay
 398                  * around on the old channel. We currently lack
 399                  * good handling of this situation, possibly we
 400                  * should just drop the association.
 401                  */
 402                 sdata->local->csa_channel = sdata->local->oper_channel;
 403         }
 404
 405         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 406 }
 407 EXPORT_SYMBOL(ieee80211_chswitch_done);
 408
 409 static void ieee80211_chswitch_timer(unsigned long data)
 410 {
 411         struct ieee80211_sub_if_data *sdata =
 412                 (struct ieee80211_sub_if_data *) data;
 413         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 414
 415         if (sdata->local->quiescing) {
 416                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 417                 return;
 418         }
 419
 420         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 421 }
 422
 423 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 424                                       struct ieee80211_channel_sw_ie *sw_elem,
 425                                       struct ieee80211_bss *bss,
 426                                       u64 timestamp)
 427 {
 428         struct cfg80211_bss *cbss =
 429                 container_of((void *)bss, struct cfg80211_bss, priv);
 430         struct ieee80211_channel *new_ch;
 431         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 432         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 433
 434         ASSERT_MGD_MTX(ifmgd);
 435
 436         if (!ifmgd->associated)
 437                 return;
 438
 439         if (sdata->local->scanning)
 440                 return;
 441
 442         /* Disregard subsequent beacons if we are already running a timer
 443            processing a CSA */
 444
 445         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 446                 return;
 447
 448         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 449         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 450                 return;
 451
 452         sdata->local->csa_channel = new_ch;
 453
 454         if (sdata->local->ops->channel_switch) {
 455                 /* use driver's channel switch callback */
 456                 struct ieee80211_channel_switch ch_switch;
 457                 memset(&ch_switch, 0, sizeof(ch_switch));
 458                 ch_switch.timestamp = timestamp;
 459                 if (sw_elem->mode) {
 460                         ch_switch.block_tx = true;
 461                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 462                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 463                 }
 464                 ch_switch.channel = new_ch;
 465                 ch_switch.count = sw_elem->count;
 466                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 467                 drv_channel_switch(sdata->local, &ch_switch);
 468                 return;
 469         }
 470
 471         /* channel switch handled in software */
 472         if (sw_elem->count <= 1) {
 473                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 474         } else {
 475                 if (sw_elem->mode)
 476                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 477                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 478                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 479                 mod_timer(&ifmgd->chswitch_timer,
 480                           jiffies +
 481                           msecs_to_jiffies(sw_elem->count *
 482                                            cbss->beacon_interval));
 483         }
 484 }
 485
 486 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 487                                         u16 capab_info, u8 *pwr_constr_elem,
 488                                         u8 pwr_constr_elem_len)
 489 {
 490         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 491
 492         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 493                 return;
 494
 495         /* Power constraint IE length should be 1 octet */
 496         if (pwr_constr_elem_len != 1)
 497                 return;
 498
 499         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 500             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 501                 sdata->local->power_constr_level = *pwr_constr_elem;
 502                 ieee80211_hw_config(sdata->local, 0);
 503         }
 504 }
 505
 506 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 507 {
 508         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 509         struct ieee80211_local *local = sdata->local;
 510         struct ieee80211_conf *conf = &local->hw.conf;
 511
 512         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 513                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 514                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 515
 516         local->disable_dynamic_ps = false;
 517         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 518 }
 519 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 520
 521 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 522 {
 523         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 524         struct ieee80211_local *local = sdata->local;
 525         struct ieee80211_conf *conf = &local->hw.conf;
 526
 527         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 528                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 529                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 530
 531         local->disable_dynamic_ps = true;
 532         conf->dynamic_ps_timeout = 0;
 533         del_timer_sync(&local->dynamic_ps_timer);
 534         ieee80211_queue_work(&local->hw,
 535                              &local->dynamic_ps_enable_work);
 536 }
 537 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 538
 539 /* powersave */
 540 static void ieee80211_enable_ps(struct ieee80211_local *local,
 541                                 struct ieee80211_sub_if_data *sdata)
 542 {
 543         struct ieee80211_conf *conf = &local->hw.conf;
 544
 545         /*
 546          * If we are scanning right now then the parameters will
 547          * take effect when scan finishes.
 548          */
 549         if (local->scanning)
 550                 return;
 551
 552         if (conf->dynamic_ps_timeout > 0 &&
 553             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 554                 mod_timer(&local->dynamic_ps_timer, jiffies +
 555                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 556         } else {
 557                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 558                         ieee80211_send_nullfunc(local, sdata, 1);
 559
 560                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 561                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 562                         return;
 563
 564                 conf->flags |= IEEE80211_CONF_PS;
 565                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 566         }
 567 }
 568
 569 static void ieee80211_change_ps(struct ieee80211_local *local)
 570 {
 571         struct ieee80211_conf *conf = &local->hw.conf;
 572
 573         if (local->ps_sdata) {
 574                 ieee80211_enable_ps(local, local->ps_sdata);
 575         } else if (conf->flags & IEEE80211_CONF_PS) {
 576                 conf->flags &= ~IEEE80211_CONF_PS;
 577                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 578                 del_timer_sync(&local->dynamic_ps_timer);
 579                 cancel_work_sync(&local->dynamic_ps_enable_work);
 580         }
 581 }
 582
 583 /* need to hold RTNL or interface lock */
 584 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 585 {
 586         struct ieee80211_sub_if_data *sdata, *found = NULL;
 587         int count = 0;
 588         int timeout;
 589
 590         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 591                 local->ps_sdata = NULL;
 592                 return;
 593         }
 594
 595         if (!list_empty(&local->work_list)) {
 596                 local->ps_sdata = NULL;
 597                 goto change;
 598         }
 599
 600         list_for_each_entry(sdata, &local->interfaces, list) {
 601                 if (!ieee80211_sdata_running(sdata))
 602                         continue;
 603                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 604                         continue;
 605                 found = sdata;
 606                 count++;
 607         }
 608
 609         if (count == 1 && found->u.mgd.powersave &&
 610             found->u.mgd.associated &&
 611             found->u.mgd.associated->beacon_ies &&
 612             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 613                                     IEEE80211_STA_CONNECTION_POLL))) {
 614                 struct ieee80211_conf *conf = &local->hw.conf;
 615                 s32 beaconint_us;
 616
 617                 if (latency < 0)
 618                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 619
 620                 beaconint_us = ieee80211_tu_to_usec(
 621                                         found->vif.bss_conf.beacon_int);
 622
 623                 timeout = local->dynamic_ps_forced_timeout;
 624                 if (timeout < 0) {
 625                         /*
 626                          * Go to full PSM if the user configures a very low
 627                          * latency requirement.
 628                          * The 2000 second value is there for compatibility
 629                          * until the PM_QOS_NETWORK_LATENCY is configured
 630                          * with real values.
 631                          */
 632                         if (latency > (1900 * USEC_PER_MSEC) &&
 633                             latency != (2000 * USEC_PER_SEC))
 634                                 timeout = 0;
 635                         else
 636                                 timeout = 100;
 637                 }
 638                 local->dynamic_ps_user_timeout = timeout;
 639                 if (!local->disable_dynamic_ps)
 640                         conf->dynamic_ps_timeout =
 641                                 local->dynamic_ps_user_timeout;
 642
 643                 if (beaconint_us > latency) {
 644                         local->ps_sdata = NULL;
 645                 } else {
 646                         struct ieee80211_bss *bss;
 647                         int maxslp = 1;
 648                         u8 dtimper;
 649
 650                         bss = (void *)found->u.mgd.associated->priv;
 651                         dtimper = bss->dtim_period;
 652
 653                         /* If the TIM IE is invalid, pretend the value is 1 */
 654                         if (!dtimper)
 655                                 dtimper = 1;
 656                         else if (dtimper > 1)
 657                                 maxslp = min_t(int, dtimper,
 658                                                     latency / beaconint_us);
 659
 660                         local->hw.conf.max_sleep_period = maxslp;
 661                         local->hw.conf.ps_dtim_period = dtimper;
 662                         local->ps_sdata = found;
 663                 }
 664         } else {
 665                 local->ps_sdata = NULL;
 666         }
 667
 668  change:
 669         ieee80211_change_ps(local);
 670 }
 671
 672 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 673 {
 674         struct ieee80211_local *local =
 675                 container_of(work, struct ieee80211_local,
 676                              dynamic_ps_disable_work);
 677
 678         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 679                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 680                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 681         }
 682
 683         ieee80211_wake_queues_by_reason(&local->hw,
 684                                         IEEE80211_QUEUE_STOP_REASON_PS);
 685 }
 686
 687 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 688 {
 689         struct ieee80211_local *local =
 690                 container_of(work, struct ieee80211_local,
 691                              dynamic_ps_enable_work);
 692         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 693         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 694
 695         /* can only happen when PS was just disabled anyway */
 696         if (!sdata)
 697                 return;
 698
 699         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 700                 return;
 701
 702         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 703             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 704                 ieee80211_send_nullfunc(local, sdata, 1);
 705
 706         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 707               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 708             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 709                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 710                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 711                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 712         }
 713 }
 714
 715 void ieee80211_dynamic_ps_timer(unsigned long data)
 716 {
 717         struct ieee80211_local *local = (void *) data;
 718
 719         if (local->quiescing || local->suspended)
 720                 return;
 721
 722         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 723 }
 724
 725 /* MLME */
 726 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 727                                      struct ieee80211_sub_if_data *sdata,
 728                                      u8 *wmm_param, size_t wmm_param_len)
 729 {
 730         struct ieee80211_tx_queue_params params;
 731         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 732         size_t left;
 733         int count;
 734         u8 *pos, uapsd_queues = 0;
 735
 736         if (!local->ops->conf_tx)
 737                 return;
 738
 739         if (local->hw.queues < 4)
 740                 return;
 741
 742         if (!wmm_param)
 743                 return;
 744
 745         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 746                 return;
 747
 748         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 749                 uapsd_queues = local->uapsd_queues;
 750
 751         count = wmm_param[6] & 0x0f;
 752         if (count == ifmgd->wmm_last_param_set)
 753                 return;
 754         ifmgd->wmm_last_param_set = count;
 755
 756         pos = wmm_param + 8;
 757         left = wmm_param_len - 8;
 758
 759         memset(&params, 0, sizeof(params));
 760
 761         local->wmm_acm = 0;
 762         for (; left >= 4; left -= 4, pos += 4) {
 763                 int aci = (pos[0] >> 5) & 0x03;
 764                 int acm = (pos[0] >> 4) & 0x01;
 765                 bool uapsd = false;
 766                 int queue;
 767
 768                 switch (aci) {
 769                 case 1: /* AC_BK */
 770                         queue = 3;
 771                         if (acm)
 772                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 773                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 774                                 uapsd = true;
 775                         break;
 776                 case 2: /* AC_VI */
 777                         queue = 1;
 778                         if (acm)
 779                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 780                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 781                                 uapsd = true;
 782                         break;
 783                 case 3: /* AC_VO */
 784                         queue = 0;
 785                         if (acm)
 786                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 787                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 788                                 uapsd = true;
 789                         break;
 790                 case 0: /* AC_BE */
 791                 default:
 792                         queue = 2;
 793                         if (acm)
 794                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 795                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 796                                 uapsd = true;
 797                         break;
 798                 }
 799
 800                 params.aifs = pos[0] & 0x0f;
 801                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 802                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 803                 params.txop = get_unaligned_le16(pos + 2);
 804                 params.uapsd = uapsd;
 805
 806 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 807                 wiphy_debug(local->hw.wiphy,
 808                             "WMM queue=%d aci=%d acm=%d aifs=%d "
 809                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 810                             queue, aci, acm,
 811                             params.aifs, params.cw_min, params.cw_max,
 812                             params.txop, params.uapsd);
 813 #endif
 814                 if (drv_conf_tx(local, queue, &params))
 815                         wiphy_debug(local->hw.wiphy,
 816                                     "failed to set TX queue parameters for queue %d\n",
 817                                     queue);
 818         }
 819
 820         /* enable WMM or activate new settings */
 821         sdata->vif.bss_conf.qos = true;
 822         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 823 }
 824
 825 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 826                                            u16 capab, bool erp_valid, u8 erp)
 827 {
 828         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 829         u32 changed = 0;
 830         bool use_protection;
 831         bool use_short_preamble;
 832         bool use_short_slot;
 833
 834         if (erp_valid) {
 835                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 836                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 837         } else {
 838                 use_protection = false;
 839                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 840         }
 841
 842         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 843         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 844                 use_short_slot = true;
 845
 846         if (use_protection != bss_conf->use_cts_prot) {
 847                 bss_conf->use_cts_prot = use_protection;
 848                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 849         }
 850
 851         if (use_short_preamble != bss_conf->use_short_preamble) {
 852                 bss_conf->use_short_preamble = use_short_preamble;
 853                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 854         }
 855
 856         if (use_short_slot != bss_conf->use_short_slot) {
 857                 bss_conf->use_short_slot = use_short_slot;
 858                 changed |= BSS_CHANGED_ERP_SLOT;
 859         }
 860
 861         return changed;
 862 }
 863
 864 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 865                                      struct cfg80211_bss *cbss,
 866                                      u32 bss_info_changed)
 867 {
 868         struct ieee80211_bss *bss = (void *)cbss->priv;
 869         struct ieee80211_local *local = sdata->local;
 870         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 871
 872         bss_info_changed |= BSS_CHANGED_ASSOC;
 873         /* set timing information */
 874         bss_conf->beacon_int = cbss->beacon_interval;
 875         bss_conf->timestamp = cbss->tsf;
 876
 877         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 878         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 879                 cbss->capability, bss->has_erp_value, bss->erp_value);
 880
 881         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
 882                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
 883
 884         sdata->u.mgd.associated = cbss;
 885         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 886
 887         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 888
 889         /* just to be sure */
 890         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 891                                 IEEE80211_STA_BEACON_POLL);
 892
 893         ieee80211_led_assoc(local, 1);
 894
 895         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
 896                 bss_conf->dtim_period = bss->dtim_period;
 897         else
 898                 bss_conf->dtim_period = 0;
 899
 900         bss_conf->assoc = 1;
 901         /*
 902          * For now just always ask the driver to update the basic rateset
 903          * when we have associated, we aren't checking whether it actually
 904          * changed or not.
 905          */
 906         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 907
 908         /* And the BSSID changed - we're associated now */
 909         bss_info_changed |= BSS_CHANGED_BSSID;
 910
 911         /* Tell the driver to monitor connection quality (if supported) */
 912         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 913             bss_conf->cqm_rssi_thold)
 914                 bss_info_changed |= BSS_CHANGED_CQM;
 915
 916         /* Enable ARP filtering */
 917         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
 918                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 919                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
 920         }
 921
 922         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 923
 924         mutex_lock(&local->iflist_mtx);
 925         ieee80211_recalc_ps(local, -1);
 926         ieee80211_recalc_smps(local);
 927         mutex_unlock(&local->iflist_mtx);
 928
 929         netif_tx_start_all_queues(sdata->dev);
 930         netif_carrier_on(sdata->dev);
 931 }
 932
 933 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 934                                    bool remove_sta, bool tx)
 935 {
 936         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 937         struct ieee80211_local *local = sdata->local;
 938         struct sta_info *sta;
 939         u32 changed = 0, config_changed = 0;
 940         u8 bssid[ETH_ALEN];
 941
 942         ASSERT_MGD_MTX(ifmgd);
 943
 944         if (WARN_ON(!ifmgd->associated))
 945                 return;
 946
 947         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 948
 949         ifmgd->associated = NULL;
 950         memset(ifmgd->bssid, 0, ETH_ALEN);
 951
 952         /*
 953          * we need to commit the associated = NULL change because the
 954          * scan code uses that to determine whether this iface should
 955          * go to/wake up from powersave or not -- and could otherwise
 956          * wake the queues erroneously.
 957          */
 958         smp_mb();
 959
 960         /*
 961          * Thus, we can only afterwards stop the queues -- to account
 962          * for the case where another CPU is finishing a scan at this
 963          * time -- we don't want the scan code to enable queues.
 964          */
 965
 966         netif_tx_stop_all_queues(sdata->dev);
 967         netif_carrier_off(sdata->dev);
 968
 969         mutex_lock(&local->sta_mtx);
 970         sta = sta_info_get(sdata, bssid);
 971         if (sta) {
 972                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
 973                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
 974         }
 975         mutex_unlock(&local->sta_mtx);
 976
 977         changed |= ieee80211_reset_erp_info(sdata);
 978
 979         ieee80211_led_assoc(local, 0);
 980         changed |= BSS_CHANGED_ASSOC;
 981         sdata->vif.bss_conf.assoc = false;
 982
 983         ieee80211_set_wmm_default(sdata);
 984
 985         /* channel(_type) changes are handled by ieee80211_hw_config */
 986         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
 987
 988         /* on the next assoc, re-program HT parameters */
 989         sdata->ht_opmode_valid = false;
 990
 991         local->power_constr_level = 0;
 992
 993         del_timer_sync(&local->dynamic_ps_timer);
 994         cancel_work_sync(&local->dynamic_ps_enable_work);
 995
 996         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 997                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 998                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 999         }
1000
1001         ieee80211_hw_config(local, config_changed);
1002
1003         /* Disable ARP filtering */
1004         if (sdata->vif.bss_conf.arp_filter_enabled) {
1005                 sdata->vif.bss_conf.arp_filter_enabled = false;
1006                 changed |= BSS_CHANGED_ARP_FILTER;
1007         }
1008
1009         /* The BSSID (not really interesting) and HT changed */
1010         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1011         ieee80211_bss_info_change_notify(sdata, changed);
1012
1013         if (remove_sta)
1014                 sta_info_destroy_addr(sdata, bssid);
1015
1016         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1017         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1018         del_timer_sync(&sdata->u.mgd.timer);
1019         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1020 }
1021
1022 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1023                              struct ieee80211_hdr *hdr)
1024 {
1025         /*
1026          * We can postpone the mgd.timer whenever receiving unicast frames
1027          * from AP because we know that the connection is working both ways
1028          * at that time. But multicast frames (and hence also beacons) must
1029          * be ignored here, because we need to trigger the timer during
1030          * data idle periods for sending the periodic probe request to the
1031          * AP we're connected to.
1032          */
1033         if (is_multicast_ether_addr(hdr->addr1))
1034                 return;
1035
1036         ieee80211_sta_reset_conn_monitor(sdata);
1037 }
1038
1039 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1040 {
1041         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1042
1043         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1044                               IEEE80211_STA_CONNECTION_POLL)))
1045             return;
1046
1047         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1048                           IEEE80211_STA_BEACON_POLL);
1049         mutex_lock(&sdata->local->iflist_mtx);
1050         ieee80211_recalc_ps(sdata->local, -1);
1051         mutex_unlock(&sdata->local->iflist_mtx);
1052
1053         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1054                 return;
1055
1056         /*
1057          * We've received a probe response, but are not sure whether
1058          * we have or will be receiving any beacons or data, so let's
1059          * schedule the timers again, just in case.
1060          */
1061         ieee80211_sta_reset_beacon_monitor(sdata);
1062
1063         mod_timer(&ifmgd->conn_mon_timer,
1064                   round_jiffies_up(jiffies +
1065                                    IEEE80211_CONNECTION_IDLE_TIME));
1066 }
1067
1068 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1069                              struct ieee80211_hdr *hdr, bool ack)
1070 {
1071         if (!ieee80211_is_data(hdr->frame_control))
1072             return;
1073
1074         if (ack)
1075                 ieee80211_sta_reset_conn_monitor(sdata);
1076
1077         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1078             sdata->u.mgd.probe_send_count > 0) {
1079                 if (ack)
1080                         sdata->u.mgd.probe_send_count = 0;
1081                 else
1082                         sdata->u.mgd.nullfunc_failed = true;
1083                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1084         }
1085 }
1086
1087 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1088 {
1089         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1090         const u8 *ssid;
1091         u8 *dst = ifmgd->associated->bssid;
1092         u8 unicast_limit = max(1, IEEE80211_MAX_PROBE_TRIES - 3);
1093
1094         /*
1095          * Try sending broadcast probe requests for the last three
1096          * probe requests after the first ones failed since some
1097          * buggy APs only support broadcast probe requests.
1098          */
1099         if (ifmgd->probe_send_count >= unicast_limit)
1100                 dst = NULL;
1101
1102         /*
1103          * When the hardware reports an accurate Tx ACK status, it's
1104          * better to send a nullfunc frame instead of a probe request,
1105          * as it will kick us off the AP quickly if we aren't associated
1106          * anymore. The timeout will be reset if the frame is ACKed by
1107          * the AP.
1108          */
1109         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1110                 ifmgd->nullfunc_failed = false;
1111                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1112         } else {
1113                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1114                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0);
1115         }
1116
1117         ifmgd->probe_send_count++;
1118         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1119         run_again(ifmgd, ifmgd->probe_timeout);
1120 }
1121
1122 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1123                                    bool beacon)
1124 {
1125         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1126         bool already = false;
1127
1128         if (!ieee80211_sdata_running(sdata))
1129                 return;
1130
1131         if (sdata->local->scanning)
1132                 return;
1133
1134         if (sdata->local->tmp_channel)
1135                 return;
1136
1137         mutex_lock(&ifmgd->mtx);
1138
1139         if (!ifmgd->associated)
1140                 goto out;
1141
1142 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1143         if (beacon && net_ratelimit())
1144                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1145                        "- sending probe request\n", sdata->name);
1146 #endif
1147
1148         /*
1149          * The driver/our work has already reported this event or the
1150          * connection monitoring has kicked in and we have already sent
1151          * a probe request. Or maybe the AP died and the driver keeps
1152          * reporting until we disassociate...
1153          *
1154          * In either case we have to ignore the current call to this
1155          * function (except for setting the correct probe reason bit)
1156          * because otherwise we would reset the timer every time and
1157          * never check whether we received a probe response!
1158          */
1159         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1160                             IEEE80211_STA_CONNECTION_POLL))
1161                 already = true;
1162
1163         if (beacon)
1164                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1165         else
1166                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1167
1168         if (already)
1169                 goto out;
1170
1171         mutex_lock(&sdata->local->iflist_mtx);
1172         ieee80211_recalc_ps(sdata->local, -1);
1173         mutex_unlock(&sdata->local->iflist_mtx);
1174
1175         ifmgd->probe_send_count = 0;
1176         ieee80211_mgd_probe_ap_send(sdata);
1177  out:
1178         mutex_unlock(&ifmgd->mtx);
1179 }
1180
1181 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1182                                           struct ieee80211_vif *vif)
1183 {
1184         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1185         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1186         struct sk_buff *skb;
1187         const u8 *ssid;
1188
1189         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1190                 return NULL;
1191
1192         ASSERT_MGD_MTX(ifmgd);
1193
1194         if (!ifmgd->associated)
1195                 return NULL;
1196
1197         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1198         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1199                                         ssid + 2, ssid[1], NULL, 0);
1200
1201         return skb;
1202 }
1203 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1204
1205 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1206 {
1207         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1208         struct ieee80211_local *local = sdata->local;
1209         u8 bssid[ETH_ALEN];
1210
1211         mutex_lock(&ifmgd->mtx);
1212         if (!ifmgd->associated) {
1213                 mutex_unlock(&ifmgd->mtx);
1214                 return;
1215         }
1216
1217         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1218
1219         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1220
1221         ieee80211_set_disassoc(sdata, true, true);
1222         mutex_unlock(&ifmgd->mtx);
1223
1224         mutex_lock(&local->mtx);
1225         ieee80211_recalc_idle(local);
1226         mutex_unlock(&local->mtx);
1227         /*
1228          * must be outside lock due to cfg80211,
1229          * but that's not a problem.
1230          */
1231         ieee80211_send_deauth_disassoc(sdata, bssid,
1232                                        IEEE80211_STYPE_DEAUTH,
1233                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1234                                        NULL, true);
1235 }
1236
1237 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1238 {
1239         struct ieee80211_sub_if_data *sdata =
1240                 container_of(work, struct ieee80211_sub_if_data,
1241                              u.mgd.beacon_connection_loss_work);
1242
1243         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1244                 __ieee80211_connection_loss(sdata);
1245         else
1246                 ieee80211_mgd_probe_ap(sdata, true);
1247 }
1248
1249 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1250 {
1251         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1252         struct ieee80211_hw *hw = &sdata->local->hw;
1253
1254         trace_api_beacon_loss(sdata);
1255
1256         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1257         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1258 }
1259 EXPORT_SYMBOL(ieee80211_beacon_loss);
1260
1261 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1262 {
1263         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1264         struct ieee80211_hw *hw = &sdata->local->hw;
1265
1266         trace_api_connection_loss(sdata);
1267
1268         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1269         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1270 }
1271 EXPORT_SYMBOL(ieee80211_connection_loss);
1272
1273
1274 static enum rx_mgmt_action __must_check
1275 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1276                          struct ieee80211_mgmt *mgmt, size_t len)
1277 {
1278         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1279         const u8 *bssid = NULL;
1280         u16 reason_code;
1281
1282         if (len < 24 + 2)
1283                 return RX_MGMT_NONE;
1284
1285         ASSERT_MGD_MTX(ifmgd);
1286
1287         bssid = ifmgd->associated->bssid;
1288
1289         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1290
1291         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1292                         sdata->name, bssid, reason_code);
1293
1294         ieee80211_set_disassoc(sdata, true, false);
1295         mutex_lock(&sdata->local->mtx);
1296         ieee80211_recalc_idle(sdata->local);
1297         mutex_unlock(&sdata->local->mtx);
1298
1299         return RX_MGMT_CFG80211_DEAUTH;
1300 }
1301
1302
1303 static enum rx_mgmt_action __must_check
1304 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1305                            struct ieee80211_mgmt *mgmt, size_t len)
1306 {
1307         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1308         u16 reason_code;
1309
1310         if (len < 24 + 2)
1311                 return RX_MGMT_NONE;
1312
1313         ASSERT_MGD_MTX(ifmgd);
1314
1315         if (WARN_ON(!ifmgd->associated))
1316                 return RX_MGMT_NONE;
1317
1318         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1319                 return RX_MGMT_NONE;
1320
1321         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1322
1323         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1324                         sdata->name, mgmt->sa, reason_code);
1325
1326         ieee80211_set_disassoc(sdata, true, false);
1327         mutex_lock(&sdata->local->mtx);
1328         ieee80211_recalc_idle(sdata->local);
1329         mutex_unlock(&sdata->local->mtx);
1330         return RX_MGMT_CFG80211_DISASSOC;
1331 }
1332
1333
1334 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1335                                     struct ieee80211_mgmt *mgmt, size_t len)
1336 {
1337         struct ieee80211_sub_if_data *sdata = wk->sdata;
1338         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1339         struct ieee80211_local *local = sdata->local;
1340         struct ieee80211_supported_band *sband;
1341         struct sta_info *sta;
1342         struct cfg80211_bss *cbss = wk->assoc.bss;
1343         u8 *pos;
1344         u32 rates, basic_rates;
1345         u16 capab_info, aid;
1346         struct ieee802_11_elems elems;
1347         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1348         u32 changed = 0;
1349         int i, j, err;
1350         bool have_higher_than_11mbit = false;
1351         u16 ap_ht_cap_flags;
1352
1353         /* AssocResp and ReassocResp have identical structure */
1354
1355         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1356         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1357
1358         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1359                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1360                        "set\n", sdata->name, aid);
1361         aid &= ~(BIT(15) | BIT(14));
1362
1363         pos = mgmt->u.assoc_resp.variable;
1364         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1365
1366         if (!elems.supp_rates) {
1367                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1368                        sdata->name);
1369                 return false;
1370         }
1371
1372         ifmgd->aid = aid;
1373
1374         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1375         if (!sta) {
1376                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1377                        " the AP\n", sdata->name);
1378                 return false;
1379         }
1380
1381         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1382                            WLAN_STA_ASSOC_AP);
1383         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1384                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1385
1386         rates = 0;
1387         basic_rates = 0;
1388         sband = local->hw.wiphy->bands[wk->chan->band];
1389
1390         for (i = 0; i < elems.supp_rates_len; i++) {
1391                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1392                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1393
1394                 if (rate > 110)
1395                         have_higher_than_11mbit = true;
1396
1397                 for (j = 0; j < sband->n_bitrates; j++) {
1398                         if (sband->bitrates[j].bitrate == rate) {
1399                                 rates |= BIT(j);
1400                                 if (is_basic)
1401                                         basic_rates |= BIT(j);
1402                                 break;
1403                         }
1404                 }
1405         }
1406
1407         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1408                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1409                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1410
1411                 if (rate > 110)
1412                         have_higher_than_11mbit = true;
1413
1414                 for (j = 0; j < sband->n_bitrates; j++) {
1415                         if (sband->bitrates[j].bitrate == rate) {
1416                                 rates |= BIT(j);
1417                                 if (is_basic)
1418                                         basic_rates |= BIT(j);
1419                                 break;
1420                         }
1421                 }
1422         }
1423
1424         sta->sta.supp_rates[wk->chan->band] = rates;
1425         sdata->vif.bss_conf.basic_rates = basic_rates;
1426
1427         /* cf. IEEE 802.11 9.2.12 */
1428         if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1429             have_higher_than_11mbit)
1430                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1431         else
1432                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1433
1434         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1435                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1436                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1437
1438         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1439
1440         rate_control_rate_init(sta);
1441
1442         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1443                 set_sta_flags(sta, WLAN_STA_MFP);
1444
1445         if (elems.wmm_param)
1446                 set_sta_flags(sta, WLAN_STA_WME);
1447
1448         err = sta_info_insert(sta);
1449         sta = NULL;
1450         if (err) {
1451                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1452                        " the AP (error %d)\n", sdata->name, err);
1453                 return false;
1454         }
1455
1456         /*
1457          * Always handle WMM once after association regardless
1458          * of the first value the AP uses. Setting -1 here has
1459          * that effect because the AP values is an unsigned
1460          * 4-bit value.
1461          */
1462         ifmgd->wmm_last_param_set = -1;
1463
1464         if (elems.wmm_param)
1465                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1466                                          elems.wmm_param_len);
1467         else
1468                 ieee80211_set_wmm_default(sdata);
1469
1470         local->oper_channel = wk->chan;
1471
1472         if (elems.ht_info_elem && elems.wmm_param &&
1473             (sdata->local->hw.queues >= 4) &&
1474             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1475                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1476                                                cbss->bssid, ap_ht_cap_flags);
1477
1478         /* set AID and assoc capability,
1479          * ieee80211_set_associated() will tell the driver */
1480         bss_conf->aid = aid;
1481         bss_conf->assoc_capability = capab_info;
1482         ieee80211_set_associated(sdata, cbss, changed);
1483
1484         /*
1485          * If we're using 4-addr mode, let the AP know that we're
1486          * doing so, so that it can create the STA VLAN on its side
1487          */
1488         if (ifmgd->use_4addr)
1489                 ieee80211_send_4addr_nullfunc(local, sdata);
1490
1491         /*
1492          * Start timer to probe the connection to the AP now.
1493          * Also start the timer that will detect beacon loss.
1494          */
1495         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1496         ieee80211_sta_reset_beacon_monitor(sdata);
1497
1498         return true;
1499 }
1500
1501
1502 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1503                                   struct ieee80211_mgmt *mgmt,
1504                                   size_t len,
1505                                   struct ieee80211_rx_status *rx_status,
1506                                   struct ieee802_11_elems *elems,
1507                                   bool beacon)
1508 {
1509         struct ieee80211_local *local = sdata->local;
1510         int freq;
1511         struct ieee80211_bss *bss;
1512         struct ieee80211_channel *channel;
1513         bool need_ps = false;
1514
1515         if (sdata->u.mgd.associated) {
1516                 bss = (void *)sdata->u.mgd.associated->priv;
1517                 /* not previously set so we may need to recalc */
1518                 need_ps = !bss->dtim_period;
1519         }
1520
1521         if (elems->ds_params && elems->ds_params_len == 1)
1522                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1523         else
1524                 freq = rx_status->freq;
1525
1526         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1527
1528         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1529                 return;
1530
1531         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1532                                         channel, beacon);
1533         if (bss)
1534                 ieee80211_rx_bss_put(local, bss);
1535
1536         if (!sdata->u.mgd.associated)
1537                 return;
1538
1539         if (need_ps) {
1540                 mutex_lock(&local->iflist_mtx);
1541                 ieee80211_recalc_ps(local, -1);
1542                 mutex_unlock(&local->iflist_mtx);
1543         }
1544
1545         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1546             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1547                                                         ETH_ALEN) == 0)) {
1548                 struct ieee80211_channel_sw_ie *sw_elem =
1549                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1550                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1551                                                  bss, rx_status->mactime);
1552         }
1553 }
1554
1555
1556 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1557                                          struct sk_buff *skb)
1558 {
1559         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1560         struct ieee80211_if_managed *ifmgd;
1561         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1562         size_t baselen, len = skb->len;
1563         struct ieee802_11_elems elems;
1564
1565         ifmgd = &sdata->u.mgd;
1566
1567         ASSERT_MGD_MTX(ifmgd);
1568
1569         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1570                 return; /* ignore ProbeResp to foreign address */
1571
1572         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1573         if (baselen > len)
1574                 return;
1575
1576         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1577                                 &elems);
1578
1579         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1580
1581         if (ifmgd->associated &&
1582             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1583                 ieee80211_reset_ap_probe(sdata);
1584 }
1585
1586 /*
1587  * This is the canonical list of information elements we care about,
1588  * the filter code also gives us all changes to the Microsoft OUI
1589  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1590  *
1591  * We implement beacon filtering in software since that means we can
1592  * avoid processing the frame here and in cfg80211, and userspace
1593  * will not be able to tell whether the hardware supports it or not.
1594  *
1595  * XXX: This list needs to be dynamic -- userspace needs to be able to
1596  *      add items it requires. It also needs to be able to tell us to
1597  *      look out for other vendor IEs.
1598  */
1599 static const u64 care_about_ies =
1600         (1ULL << WLAN_EID_COUNTRY) |
1601         (1ULL << WLAN_EID_ERP_INFO) |
1602         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1603         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1604         (1ULL << WLAN_EID_HT_CAPABILITY) |
1605         (1ULL << WLAN_EID_HT_INFORMATION);
1606
1607 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1608                                      struct ieee80211_mgmt *mgmt,
1609                                      size_t len,
1610                                      struct ieee80211_rx_status *rx_status)
1611 {
1612         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1613         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1614         size_t baselen;
1615         struct ieee802_11_elems elems;
1616         struct ieee80211_local *local = sdata->local;
1617         u32 changed = 0;
1618         bool erp_valid, directed_tim = false;
1619         u8 erp_value = 0;
1620         u32 ncrc;
1621         u8 *bssid;
1622
1623         ASSERT_MGD_MTX(ifmgd);
1624
1625         /* Process beacon from the current BSS */
1626         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1627         if (baselen > len)
1628                 return;
1629
1630         if (rx_status->freq != local->hw.conf.channel->center_freq)
1631                 return;
1632
1633         /*
1634          * We might have received a number of frames, among them a
1635          * disassoc frame and a beacon...
1636          */
1637         if (!ifmgd->associated)
1638                 return;
1639
1640         bssid = ifmgd->associated->bssid;
1641
1642         /*
1643          * And in theory even frames from a different AP we were just
1644          * associated to a split-second ago!
1645          */
1646         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1647                 return;
1648
1649         /* Track average RSSI from the Beacon frames of the current AP */
1650         ifmgd->last_beacon_signal = rx_status->signal;
1651         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1652                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1653                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1654                 ifmgd->last_cqm_event_signal = 0;
1655                 ifmgd->count_beacon_signal = 1;
1656         } else {
1657                 ifmgd->ave_beacon_signal =
1658                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1659                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1660                          ifmgd->ave_beacon_signal) / 16;
1661                 ifmgd->count_beacon_signal++;
1662         }
1663         if (bss_conf->cqm_rssi_thold &&
1664             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1665             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1666                 int sig = ifmgd->ave_beacon_signal / 16;
1667                 int last_event = ifmgd->last_cqm_event_signal;
1668                 int thold = bss_conf->cqm_rssi_thold;
1669                 int hyst = bss_conf->cqm_rssi_hyst;
1670                 if (sig < thold &&
1671                     (last_event == 0 || sig < last_event - hyst)) {
1672                         ifmgd->last_cqm_event_signal = sig;
1673                         ieee80211_cqm_rssi_notify(
1674                                 &sdata->vif,
1675                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1676                                 GFP_KERNEL);
1677                 } else if (sig > thold &&
1678                            (last_event == 0 || sig > last_event + hyst)) {
1679                         ifmgd->last_cqm_event_signal = sig;
1680                         ieee80211_cqm_rssi_notify(
1681                                 &sdata->vif,
1682                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1683                                 GFP_KERNEL);
1684                 }
1685         }
1686
1687         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1688 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1689                 if (net_ratelimit()) {
1690                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1691                                "to a received beacon\n", sdata->name);
1692                 }
1693 #endif
1694                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1695                 mutex_lock(&local->iflist_mtx);
1696                 ieee80211_recalc_ps(local, -1);
1697                 mutex_unlock(&local->iflist_mtx);
1698         }
1699
1700         /*
1701          * Push the beacon loss detection into the future since
1702          * we are processing a beacon from the AP just now.
1703          */
1704         ieee80211_sta_reset_beacon_monitor(sdata);
1705
1706         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1707         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1708                                           len - baselen, &elems,
1709                                           care_about_ies, ncrc);
1710
1711         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1712                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1713                                                    ifmgd->aid);
1714
1715         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1716                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1717                                       true);
1718
1719                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1720                                          elems.wmm_param_len);
1721         }
1722
1723         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1724                 if (directed_tim) {
1725                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1726                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1727                                 ieee80211_hw_config(local,
1728                                                     IEEE80211_CONF_CHANGE_PS);
1729                                 ieee80211_send_nullfunc(local, sdata, 0);
1730                         } else {
1731                                 local->pspolling = true;
1732
1733                                 /*
1734                                  * Here is assumed that the driver will be
1735                                  * able to send ps-poll frame and receive a
1736                                  * response even though power save mode is
1737                                  * enabled, but some drivers might require
1738                                  * to disable power save here. This needs
1739                                  * to be investigated.
1740                                  */
1741                                 ieee80211_send_pspoll(local, sdata);
1742                         }
1743                 }
1744         }
1745
1746         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1747                 return;
1748         ifmgd->beacon_crc = ncrc;
1749         ifmgd->beacon_crc_valid = true;
1750
1751         if (elems.erp_info && elems.erp_info_len >= 1) {
1752                 erp_valid = true;
1753                 erp_value = elems.erp_info[0];
1754         } else {
1755                 erp_valid = false;
1756         }
1757         changed |= ieee80211_handle_bss_capability(sdata,
1758                         le16_to_cpu(mgmt->u.beacon.capab_info),
1759                         erp_valid, erp_value);
1760
1761
1762         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1763             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1764                 struct sta_info *sta;
1765                 struct ieee80211_supported_band *sband;
1766                 u16 ap_ht_cap_flags;
1767
1768                 rcu_read_lock();
1769
1770                 sta = sta_info_get(sdata, bssid);
1771                 if (WARN_ON(!sta)) {
1772                         rcu_read_unlock();
1773                         return;
1774                 }
1775
1776                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1777
1778                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1779                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1780
1781                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1782
1783                 rcu_read_unlock();
1784
1785                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1786                                                bssid, ap_ht_cap_flags);
1787         }
1788
1789         /* Note: country IE parsing is done for us by cfg80211 */
1790         if (elems.country_elem) {
1791                 /* TODO: IBSS also needs this */
1792                 if (elems.pwr_constr_elem)
1793                         ieee80211_handle_pwr_constr(sdata,
1794                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1795                                 elems.pwr_constr_elem,
1796                                 elems.pwr_constr_elem_len);
1797         }
1798
1799         ieee80211_bss_info_change_notify(sdata, changed);
1800 }
1801
1802 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1803                                   struct sk_buff *skb)
1804 {
1805         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1806         struct ieee80211_rx_status *rx_status;
1807         struct ieee80211_mgmt *mgmt;
1808         enum rx_mgmt_action rma = RX_MGMT_NONE;
1809         u16 fc;
1810
1811         rx_status = (struct ieee80211_rx_status *) skb->cb;
1812         mgmt = (struct ieee80211_mgmt *) skb->data;
1813         fc = le16_to_cpu(mgmt->frame_control);
1814
1815         mutex_lock(&ifmgd->mtx);
1816
1817         if (ifmgd->associated &&
1818             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1819                 switch (fc & IEEE80211_FCTL_STYPE) {
1820                 case IEEE80211_STYPE_BEACON:
1821                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1822                                                  rx_status);
1823                         break;
1824                 case IEEE80211_STYPE_PROBE_RESP:
1825                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1826                         break;
1827                 case IEEE80211_STYPE_DEAUTH:
1828                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1829                         break;
1830                 case IEEE80211_STYPE_DISASSOC:
1831                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1832                         break;
1833                 case IEEE80211_STYPE_ACTION:
1834                         switch (mgmt->u.action.category) {
1835                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1836                                 ieee80211_sta_process_chanswitch(sdata,
1837                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1838                                                 (void *)ifmgd->associated->priv,
1839                                                 rx_status->mactime);
1840                                 break;
1841                         }
1842                 }
1843                 mutex_unlock(&ifmgd->mtx);
1844
1845                 switch (rma) {
1846                 case RX_MGMT_NONE:
1847                         /* no action */
1848                         break;
1849                 case RX_MGMT_CFG80211_DEAUTH:
1850                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1851                         break;
1852                 case RX_MGMT_CFG80211_DISASSOC:
1853                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1854                         break;
1855                 default:
1856                         WARN(1, "unexpected: %d", rma);
1857                 }
1858                 return;
1859         }
1860
1861         mutex_unlock(&ifmgd->mtx);
1862
1863         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1864             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1865                 struct ieee80211_local *local = sdata->local;
1866                 struct ieee80211_work *wk;
1867
1868                 mutex_lock(&local->mtx);
1869                 list_for_each_entry(wk, &local->work_list, list) {
1870                         if (wk->sdata != sdata)
1871                                 continue;
1872
1873                         if (wk->type != IEEE80211_WORK_ASSOC &&
1874                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1875                                 continue;
1876
1877                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1878                                 continue;
1879                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1880                                 continue;
1881
1882                         /*
1883                          * Printing the message only here means we can't
1884                          * spuriously print it, but it also means that it
1885                          * won't be printed when the frame comes in before
1886                          * we even tried to associate or in similar cases.
1887                          *
1888                          * Ultimately, I suspect cfg80211 should print the
1889                          * messages instead.
1890                          */
1891                         printk(KERN_DEBUG
1892                                "%s: deauthenticated from %pM (Reason: %u)\n",
1893                                sdata->name, mgmt->bssid,
1894                                le16_to_cpu(mgmt->u.deauth.reason_code));
1895
1896                         list_del_rcu(&wk->list);
1897                         free_work(wk);
1898                         break;
1899                 }
1900                 mutex_unlock(&local->mtx);
1901
1902                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1903         }
1904 }
1905
1906 static void ieee80211_sta_timer(unsigned long data)
1907 {
1908         struct ieee80211_sub_if_data *sdata =
1909                 (struct ieee80211_sub_if_data *) data;
1910         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1911         struct ieee80211_local *local = sdata->local;
1912
1913         if (local->quiescing) {
1914                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1915                 return;
1916         }
1917
1918         ieee80211_queue_work(&local->hw, &sdata->work);
1919 }
1920
1921 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
1922                                           u8 *bssid)
1923 {
1924         struct ieee80211_local *local = sdata->local;
1925         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1926
1927         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1928                           IEEE80211_STA_BEACON_POLL);
1929
1930         ieee80211_set_disassoc(sdata, true, true);
1931         mutex_unlock(&ifmgd->mtx);
1932         mutex_lock(&local->mtx);
1933         ieee80211_recalc_idle(local);
1934         mutex_unlock(&local->mtx);
1935         /*
1936          * must be outside lock due to cfg80211,
1937          * but that's not a problem.
1938          */
1939         ieee80211_send_deauth_disassoc(sdata, bssid,
1940                         IEEE80211_STYPE_DEAUTH,
1941                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1942                         NULL, true);
1943         mutex_lock(&ifmgd->mtx);
1944 }
1945
1946 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
1947 {
1948         struct ieee80211_local *local = sdata->local;
1949         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1950
1951         /* then process the rest of the work */
1952         mutex_lock(&ifmgd->mtx);
1953
1954         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1955                             IEEE80211_STA_CONNECTION_POLL) &&
1956             ifmgd->associated) {
1957                 u8 bssid[ETH_ALEN];
1958                 int max_tries;
1959
1960                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1961
1962                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1963                         max_tries = IEEE80211_MAX_NULLFUNC_TRIES;
1964                 else
1965                         max_tries = IEEE80211_MAX_PROBE_TRIES;
1966
1967                 /* ACK received for nullfunc probing frame */
1968                 if (!ifmgd->probe_send_count)
1969                         ieee80211_reset_ap_probe(sdata);
1970                 else if (ifmgd->nullfunc_failed) {
1971                         if (ifmgd->probe_send_count < max_tries) {
1972 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1973                                 wiphy_debug(local->hw.wiphy,
1974                                             "%s: No ack for nullfunc frame to"
1975                                             " AP %pM, try %d\n",
1976                                             sdata->name, bssid,
1977                                             ifmgd->probe_send_count);
1978 #endif
1979                                 ieee80211_mgd_probe_ap_send(sdata);
1980                         } else {
1981 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1982                                 wiphy_debug(local->hw.wiphy,
1983                                             "%s: No ack for nullfunc frame to"
1984                                             " AP %pM, disconnecting.\n",
1985                                             sdata->name, bssid);
1986 #endif
1987                                 ieee80211_sta_connection_lost(sdata, bssid);
1988                         }
1989                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
1990                         run_again(ifmgd, ifmgd->probe_timeout);
1991                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1992 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1993                         wiphy_debug(local->hw.wiphy,
1994                                     "%s: Failed to send nullfunc to AP %pM"
1995                                     " after %dms, disconnecting.\n",
1996                                     sdata->name,
1997                                     bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1998 #endif
1999                         ieee80211_sta_connection_lost(sdata, bssid);
2000                 } else if (ifmgd->probe_send_count < max_tries) {
2001 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2002                         wiphy_debug(local->hw.wiphy,
2003                                     "%s: No probe response from AP %pM"
2004                                     " after %dms, try %d\n",
2005                                     sdata->name,
2006                                     bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ,
2007                                     ifmgd->probe_send_count);
2008 #endif
2009                         ieee80211_mgd_probe_ap_send(sdata);
2010                 } else {
2011                         /*
2012                          * We actually lost the connection ... or did we?
2013                          * Let's make sure!
2014                          */
2015                         wiphy_debug(local->hw.wiphy,
2016                                     "%s: No probe response from AP %pM"
2017                                     " after %dms, disconnecting.\n",
2018                                     sdata->name,
2019                                     bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
2020
2021                         ieee80211_sta_connection_lost(sdata, bssid);
2022                 }
2023         }
2024
2025         mutex_unlock(&ifmgd->mtx);
2026 }
2027
2028 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2029 {
2030         struct ieee80211_sub_if_data *sdata =
2031                 (struct ieee80211_sub_if_data *) data;
2032         struct ieee80211_local *local = sdata->local;
2033
2034         if (local->quiescing)
2035                 return;
2036
2037         ieee80211_queue_work(&sdata->local->hw,
2038                              &sdata->u.mgd.beacon_connection_loss_work);
2039 }
2040
2041 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2042 {
2043         struct ieee80211_sub_if_data *sdata =
2044                 (struct ieee80211_sub_if_data *) data;
2045         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2046         struct ieee80211_local *local = sdata->local;
2047
2048         if (local->quiescing)
2049                 return;
2050
2051         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2052 }
2053
2054 static void ieee80211_sta_monitor_work(struct work_struct *work)
2055 {
2056         struct ieee80211_sub_if_data *sdata =
2057                 container_of(work, struct ieee80211_sub_if_data,
2058                              u.mgd.monitor_work);
2059
2060         ieee80211_mgd_probe_ap(sdata, false);
2061 }
2062
2063 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2064 {
2065         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2066                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2067                                         IEEE80211_STA_CONNECTION_POLL);
2068
2069                 /* let's probe the connection once */
2070                 ieee80211_queue_work(&sdata->local->hw,
2071                            &sdata->u.mgd.monitor_work);
2072                 /* and do all the other regular work too */
2073                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2074         }
2075 }
2076
2077 #ifdef CONFIG_PM
2078 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2079 {
2080         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2081
2082         /*
2083          * we need to use atomic bitops for the running bits
2084          * only because both timers might fire at the same
2085          * time -- the code here is properly synchronised.
2086          */
2087
2088         cancel_work_sync(&ifmgd->request_smps_work);
2089
2090         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2091         if (del_timer_sync(&ifmgd->timer))
2092                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2093
2094         cancel_work_sync(&ifmgd->chswitch_work);
2095         if (del_timer_sync(&ifmgd->chswitch_timer))
2096                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2097
2098         cancel_work_sync(&ifmgd->monitor_work);
2099         /* these will just be re-established on connection */
2100         del_timer_sync(&ifmgd->conn_mon_timer);
2101         del_timer_sync(&ifmgd->bcn_mon_timer);
2102 }
2103
2104 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2105 {
2106         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2107
2108         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2109                 add_timer(&ifmgd->timer);
2110         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2111                 add_timer(&ifmgd->chswitch_timer);
2112         ieee80211_sta_reset_beacon_monitor(sdata);
2113         ieee80211_restart_sta_timer(sdata);
2114 }
2115 #endif
2116
2117 /* interface setup */
2118 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2119 {
2120         struct ieee80211_if_managed *ifmgd;
2121
2122         ifmgd = &sdata->u.mgd;
2123         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2124         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2125         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2126                   ieee80211_beacon_connection_loss_work);
2127         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2128         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2129                     (unsigned long) sdata);
2130         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2131                     (unsigned long) sdata);
2132         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2133                     (unsigned long) sdata);
2134         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2135                     (unsigned long) sdata);
2136
2137         ifmgd->flags = 0;
2138
2139         mutex_init(&ifmgd->mtx);
2140
2141         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2142                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2143         else
2144                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2145 }
2146
2147 /* scan finished notification */
2148 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2149 {
2150         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2151
2152         /* Restart STA timers */
2153         rcu_read_lock();
2154         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2155                 ieee80211_restart_sta_timer(sdata);
2156         rcu_read_unlock();
2157 }
2158
2159 int ieee80211_max_network_latency(struct notifier_block *nb,
2160                                   unsigned long data, void *dummy)
2161 {
2162         s32 latency_usec = (s32) data;
2163         struct ieee80211_local *local =
2164                 container_of(nb, struct ieee80211_local,
2165                              network_latency_notifier);
2166
2167         mutex_lock(&local->iflist_mtx);
2168         ieee80211_recalc_ps(local, latency_usec);
2169         mutex_unlock(&local->iflist_mtx);
2170
2171         return 0;
2172 }
2173
2174 /* config hooks */
2175 static enum work_done_result
2176 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2177                           struct sk_buff *skb)
2178 {
2179         if (!skb) {
2180                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2181                 return WORK_DONE_DESTROY;
2182         }
2183
2184         if (wk->type == IEEE80211_WORK_AUTH) {
2185                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2186                 return WORK_DONE_DESTROY;
2187         }
2188
2189         mutex_lock(&wk->sdata->u.mgd.mtx);
2190         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2191         mutex_unlock(&wk->sdata->u.mgd.mtx);
2192
2193         wk->type = IEEE80211_WORK_AUTH;
2194         wk->probe_auth.tries = 0;
2195         return WORK_DONE_REQUEUE;
2196 }
2197
2198 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2199                        struct cfg80211_auth_request *req)
2200 {
2201         const u8 *ssid;
2202         struct ieee80211_work *wk;
2203         u16 auth_alg;
2204
2205         if (req->local_state_change)
2206                 return 0; /* no need to update mac80211 state */
2207
2208         switch (req->auth_type) {
2209         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2210                 auth_alg = WLAN_AUTH_OPEN;
2211                 break;
2212         case NL80211_AUTHTYPE_SHARED_KEY:
2213                 if (IS_ERR(sdata->local->wep_tx_tfm))
2214                         return -EOPNOTSUPP;
2215                 auth_alg = WLAN_AUTH_SHARED_KEY;
2216                 break;
2217         case NL80211_AUTHTYPE_FT:
2218                 auth_alg = WLAN_AUTH_FT;
2219                 break;
2220         case NL80211_AUTHTYPE_NETWORK_EAP:
2221                 auth_alg = WLAN_AUTH_LEAP;
2222                 break;
2223         default:
2224                 return -EOPNOTSUPP;
2225         }
2226
2227         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2228         if (!wk)
2229                 return -ENOMEM;
2230
2231         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2232
2233         if (req->ie && req->ie_len) {
2234                 memcpy(wk->ie, req->ie, req->ie_len);
2235                 wk->ie_len = req->ie_len;
2236         }
2237
2238         if (req->key && req->key_len) {
2239                 wk->probe_auth.key_len = req->key_len;
2240                 wk->probe_auth.key_idx = req->key_idx;
2241                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2242         }
2243
2244         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2245         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2246         wk->probe_auth.ssid_len = ssid[1];
2247
2248         wk->probe_auth.algorithm = auth_alg;
2249         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2250
2251         /* if we already have a probe, don't probe again */
2252         if (req->bss->proberesp_ies)
2253                 wk->type = IEEE80211_WORK_AUTH;
2254         else
2255                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2256         wk->chan = req->bss->channel;
2257         wk->sdata = sdata;
2258         wk->done = ieee80211_probe_auth_done;
2259
2260         ieee80211_add_work(wk);
2261         return 0;
2262 }
2263
2264 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2265                                                   struct sk_buff *skb)
2266 {
2267         struct ieee80211_mgmt *mgmt;
2268         struct ieee80211_rx_status *rx_status;
2269         struct ieee802_11_elems elems;
2270         u16 status;
2271
2272         if (!skb) {
2273                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2274                 return WORK_DONE_DESTROY;
2275         }
2276
2277         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2278                 mutex_lock(&wk->sdata->u.mgd.mtx);
2279                 rx_status = (void *) skb->cb;
2280                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2281                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2282                                       &elems, true);
2283                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2284
2285                 wk->type = IEEE80211_WORK_ASSOC;
2286                 /* not really done yet */
2287                 return WORK_DONE_REQUEUE;
2288         }
2289
2290         mgmt = (void *)skb->data;
2291         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2292
2293         if (status == WLAN_STATUS_SUCCESS) {
2294                 mutex_lock(&wk->sdata->u.mgd.mtx);
2295                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2296                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2297                         /* oops -- internal error -- send timeout for now */
2298                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2299                                                     wk->filter_ta);
2300                         return WORK_DONE_DESTROY;
2301                 }
2302
2303                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2304         }
2305
2306         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2307         return WORK_DONE_DESTROY;
2308 }
2309
2310 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2311                         struct cfg80211_assoc_request *req)
2312 {
2313         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2314         struct ieee80211_bss *bss = (void *)req->bss->priv;
2315         struct ieee80211_work *wk;
2316         const u8 *ssid;
2317         int i;
2318
2319         mutex_lock(&ifmgd->mtx);
2320         if (ifmgd->associated) {
2321                 if (!req->prev_bssid ||
2322                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2323                            ETH_ALEN)) {
2324                         /*
2325                          * We are already associated and the request was not a
2326                          * reassociation request from the current BSS, so
2327                          * reject it.
2328                          */
2329                         mutex_unlock(&ifmgd->mtx);
2330                         return -EALREADY;
2331                 }
2332
2333                 /* Trying to reassociate - clear previous association state */
2334                 ieee80211_set_disassoc(sdata, true, false);
2335         }
2336         mutex_unlock(&ifmgd->mtx);
2337
2338         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2339         if (!wk)
2340                 return -ENOMEM;
2341
2342         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2343         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2344
2345         ifmgd->beacon_crc_valid = false;
2346
2347         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2348                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2349                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2350                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2351                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2352
2353
2354         if (req->ie && req->ie_len) {
2355                 memcpy(wk->ie, req->ie, req->ie_len);
2356                 wk->ie_len = req->ie_len;
2357         } else
2358                 wk->ie_len = 0;
2359
2360         wk->assoc.bss = req->bss;
2361
2362         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2363
2364         /* new association always uses requested smps mode */
2365         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2366                 if (ifmgd->powersave)
2367                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2368                 else
2369                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2370         } else
2371                 ifmgd->ap_smps = ifmgd->req_smps;
2372
2373         wk->assoc.smps = ifmgd->ap_smps;
2374         /*
2375          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2376          * We still associate in non-HT mode (11a/b/g) if any one of these
2377          * ciphers is configured as pairwise.
2378          * We can set this to true for non-11n hardware, that'll be checked
2379          * separately along with the peer capabilities.
2380          */
2381         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2382         wk->assoc.capability = req->bss->capability;
2383         wk->assoc.wmm_used = bss->wmm_used;
2384         wk->assoc.supp_rates = bss->supp_rates;
2385         wk->assoc.supp_rates_len = bss->supp_rates_len;
2386         wk->assoc.ht_information_ie =
2387                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2388
2389         if (bss->wmm_used && bss->uapsd_supported &&
2390             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2391                 wk->assoc.uapsd_used = true;
2392                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2393         } else {
2394                 wk->assoc.uapsd_used = false;
2395                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2396         }
2397
2398         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2399         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2400         wk->assoc.ssid_len = ssid[1];
2401
2402         if (req->prev_bssid)
2403                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2404
2405         wk->chan = req->bss->channel;
2406         wk->sdata = sdata;
2407         wk->done = ieee80211_assoc_done;
2408         if (!bss->dtim_period &&
2409             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2410                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2411         else
2412                 wk->type = IEEE80211_WORK_ASSOC;
2413
2414         if (req->use_mfp) {
2415                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2416                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2417         } else {
2418                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2419                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2420         }
2421
2422         if (req->crypto.control_port)
2423                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2424         else
2425                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2426
2427         sdata->control_port_protocol = req->crypto.control_port_ethertype;
2428         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2429
2430         ieee80211_add_work(wk);
2431         return 0;
2432 }
2433
2434 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2435                          struct cfg80211_deauth_request *req,
2436                          void *cookie)
2437 {
2438         struct ieee80211_local *local = sdata->local;
2439         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2440         struct ieee80211_work *wk;
2441         u8 bssid[ETH_ALEN];
2442         bool assoc_bss = false;
2443
2444         mutex_lock(&ifmgd->mtx);
2445
2446         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2447         if (ifmgd->associated == req->bss) {
2448                 ieee80211_set_disassoc(sdata, false, true);
2449                 mutex_unlock(&ifmgd->mtx);
2450                 assoc_bss = true;
2451         } else {
2452                 bool not_auth_yet = false;
2453
2454                 mutex_unlock(&ifmgd->mtx);
2455
2456                 mutex_lock(&local->mtx);
2457                 list_for_each_entry(wk, &local->work_list, list) {
2458                         if (wk->sdata != sdata)
2459                                 continue;
2460
2461                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2462                             wk->type != IEEE80211_WORK_AUTH &&
2463                             wk->type != IEEE80211_WORK_ASSOC &&
2464                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2465                                 continue;
2466
2467                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2468                                 continue;
2469
2470                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2471                         list_del_rcu(&wk->list);
2472                         free_work(wk);
2473                         break;
2474                 }
2475                 mutex_unlock(&local->mtx);
2476
2477                 /*
2478                  * If somebody requests authentication and we haven't
2479                  * sent out an auth frame yet there's no need to send
2480                  * out a deauth frame either. If the state was PROBE,
2481                  * then this is the case. If it's AUTH we have sent a
2482                  * frame, and if it's IDLE we have completed the auth
2483                  * process already.
2484                  */
2485                 if (not_auth_yet) {
2486                         __cfg80211_auth_canceled(sdata->dev, bssid);
2487                         return 0;
2488                 }
2489         }
2490
2491         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2492                sdata->name, bssid, req->reason_code);
2493
2494         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2495                                        req->reason_code, cookie,
2496                                        !req->local_state_change);
2497         if (assoc_bss)
2498                 sta_info_destroy_addr(sdata, bssid);
2499
2500         mutex_lock(&sdata->local->mtx);
2501         ieee80211_recalc_idle(sdata->local);
2502         mutex_unlock(&sdata->local->mtx);
2503
2504         return 0;
2505 }
2506
2507 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2508                            struct cfg80211_disassoc_request *req,
2509                            void *cookie)
2510 {
2511         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2512         u8 bssid[ETH_ALEN];
2513
2514         mutex_lock(&ifmgd->mtx);
2515
2516         /*
2517          * cfg80211 should catch this ... but it's racy since
2518          * we can receive a disassoc frame, process it, hand it
2519          * to cfg80211 while that's in a locked section already
2520          * trying to tell us that the user wants to disconnect.
2521          */
2522         if (ifmgd->associated != req->bss) {
2523                 mutex_unlock(&ifmgd->mtx);
2524                 return -ENOLINK;
2525         }
2526
2527         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2528                sdata->name, req->bss->bssid, req->reason_code);
2529
2530         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2531         ieee80211_set_disassoc(sdata, false, true);
2532
2533         mutex_unlock(&ifmgd->mtx);
2534
2535         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2536                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2537                         cookie, !req->local_state_change);
2538         sta_info_destroy_addr(sdata, bssid);
2539
2540         mutex_lock(&sdata->local->mtx);
2541         ieee80211_recalc_idle(sdata->local);
2542         mutex_unlock(&sdata->local->mtx);
2543
2544         return 0;
2545 }
2546
2547 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2548                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2549                                gfp_t gfp)
2550 {
2551         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2552
2553         trace_api_cqm_rssi_notify(sdata, rssi_event);
2554
2555         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2556 }
2557 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);