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.h>
  21 #include <linux/crc32.h>
  22 #include <linux/slab.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "driver-ops.h"
  28 #include "rate.h"
  29 #include "led.h"
  30
  31 static int max_nullfunc_tries = 2;
  32 module_param(max_nullfunc_tries, int, 0644);
  33 MODULE_PARM_DESC(max_nullfunc_tries,
  34                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  35
  36 static int max_probe_tries = 5;
  37 module_param(max_probe_tries, int, 0644);
  38 MODULE_PARM_DESC(max_probe_tries,
  39                  "Maximum probe tries before disconnecting (reason 4).");
  40
  41 /*
  42  * Beacon loss timeout is calculated as N frames times the
  43  * advertised beacon interval.  This may need to be somewhat
  44  * higher than what hardware might detect to account for
  45  * delays in the host processing frames. But since we also
  46  * probe on beacon miss before declaring the connection lost
  47  * default to what we want.
  48  */
  49 #define IEEE80211_BEACON_LOSS_COUNT     7
  50
  51 /*
  52  * Time the connection can be idle before we probe
  53  * it to see if we can still talk to the AP.
  54  */
  55 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  56 /*
  57  * Time we wait for a probe response after sending
  58  * a probe request because of beacon loss or for
  59  * checking the connection still works.
  60  */
  61 static int probe_wait_ms = 500;
  62 module_param(probe_wait_ms, int, 0644);
  63 MODULE_PARM_DESC(probe_wait_ms,
  64                  "Maximum time(ms) to wait for probe response"
  65                  " before disconnecting (reason 4).");
  66
  67 /*
  68  * Weight given to the latest Beacon frame when calculating average signal
  69  * strength for Beacon frames received in the current BSS. This must be
  70  * between 1 and 15.
  71  */
  72 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  73
  74 /*
  75  * How many Beacon frames need to have been used in average signal strength
  76  * before starting to indicate signal change events.
  77  */
  78 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  79
  80 #define TMR_RUNNING_TIMER       0
  81 #define TMR_RUNNING_CHANSW      1
  82
  83 /*
  84  * All cfg80211 functions have to be called outside a locked
  85  * section so that they can acquire a lock themselves... This
  86  * is much simpler than queuing up things in cfg80211, but we
  87  * do need some indirection for that here.
  88  */
  89 enum rx_mgmt_action {
  90         /* no action required */
  91         RX_MGMT_NONE,
  92
  93         /* caller must call cfg80211_send_deauth() */
  94         RX_MGMT_CFG80211_DEAUTH,
  95
  96         /* caller must call cfg80211_send_disassoc() */
  97         RX_MGMT_CFG80211_DISASSOC,
  98 };
  99
 100 /* utils */
 101 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 102 {
 103         lockdep_assert_held(&ifmgd->mtx);
 104 }
 105
 106 /*
 107  * We can have multiple work items (and connection probing)
 108  * scheduling this timer, but we need to take care to only
 109  * reschedule it when it should fire _earlier_ than it was
 110  * asked for before, or if it's not pending right now. This
 111  * function ensures that. Note that it then is required to
 112  * run this function for all timeouts after the first one
 113  * has happened -- the work that runs from this timer will
 114  * do that.
 115  */
 116 static void run_again(struct ieee80211_if_managed *ifmgd,
 117                              unsigned long timeout)
 118 {
 119         ASSERT_MGD_MTX(ifmgd);
 120
 121         if (!timer_pending(&ifmgd->timer) ||
 122             time_before(timeout, ifmgd->timer.expires))
 123                 mod_timer(&ifmgd->timer, timeout);
 124 }
 125
 126 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 127 {
 128         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 129                 return;
 130
 131         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 132                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 133 }
 134
 135 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 136 {
 137         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 138
 139         if (unlikely(!sdata->u.mgd.associated))
 140                 return;
 141
 142         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 143                 return;
 144
 145         mod_timer(&sdata->u.mgd.conn_mon_timer,
 146                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 147
 148         ifmgd->probe_send_count = 0;
 149 }
 150
 151 static int ecw2cw(int ecw)
 152 {
 153         return (1 << ecw) - 1;
 154 }
 155
 156 /*
 157  * ieee80211_enable_ht should be called only after the operating band
 158  * has been determined as ht configuration depends on the hw's
 159  * HT abilities for a specific band.
 160  */
 161 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 162                                struct ieee80211_ht_info *hti,
 163                                const u8 *bssid, u16 ap_ht_cap_flags,
 164                                bool beacon_htcap_ie)
 165 {
 166         struct ieee80211_local *local = sdata->local;
 167         struct ieee80211_supported_band *sband;
 168         struct sta_info *sta;
 169         u32 changed = 0;
 170         int hti_cfreq;
 171         u16 ht_opmode;
 172         bool enable_ht = true;
 173         enum nl80211_channel_type prev_chantype;
 174         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 175
 176         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 177
 178         prev_chantype = sdata->vif.bss_conf.channel_type;
 179
 180         /* HT is not supported */
 181         if (!sband->ht_cap.ht_supported)
 182                 enable_ht = false;
 183
 184         if (enable_ht) {
 185                 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
 186                                                            sband->band);
 187                 /* check that channel matches the right operating channel */
 188                 if (local->hw.conf.channel->center_freq != hti_cfreq) {
 189                         /* Some APs mess this up, evidently.
 190                          * Netgear WNDR3700 sometimes reports 4 higher than
 191                          * the actual channel, for instance.
 192                          */
 193                         printk(KERN_DEBUG
 194                                "%s: Wrong control channel in association"
 195                                " response: configured center-freq: %d"
 196                                " hti-cfreq: %d  hti->control_chan: %d"
 197                                " band: %d.  Disabling HT.\n",
 198                                sdata->name,
 199                                local->hw.conf.channel->center_freq,
 200                                hti_cfreq, hti->control_chan,
 201                                sband->band);
 202                         enable_ht = false;
 203                 }
 204         }
 205
 206         if (enable_ht) {
 207                 channel_type = NL80211_CHAN_HT20;
 208
 209                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 210                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 211                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 212                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 213                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 214                                 if (!(local->hw.conf.channel->flags &
 215                                     IEEE80211_CHAN_NO_HT40PLUS))
 216                                         channel_type = NL80211_CHAN_HT40PLUS;
 217                                 break;
 218                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 219                                 if (!(local->hw.conf.channel->flags &
 220                                     IEEE80211_CHAN_NO_HT40MINUS))
 221                                         channel_type = NL80211_CHAN_HT40MINUS;
 222                                 break;
 223                         }
 224                 }
 225         }
 226
 227         if (local->tmp_channel)
 228                 local->tmp_channel_type = channel_type;
 229
 230         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 231                 /* can only fail due to HT40+/- mismatch */
 232                 channel_type = NL80211_CHAN_HT20;
 233                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 234         }
 235
 236         if (beacon_htcap_ie && (prev_chantype != channel_type)) {
 237                 /*
 238                  * Whenever the AP announces the HT mode change that can be
 239                  * 40MHz intolerant or etc., it would be safer to stop tx
 240                  * queues before doing hw config to avoid buffer overflow.
 241                  */
 242                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 243                                 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
 244
 245                 /* flush out all packets */
 246                 synchronize_net();
 247
 248                 drv_flush(local, false);
 249         }
 250
 251         /* channel_type change automatically detected */
 252         ieee80211_hw_config(local, 0);
 253
 254         if (prev_chantype != channel_type) {
 255                 rcu_read_lock();
 256                 sta = sta_info_get(sdata, bssid);
 257                 if (sta)
 258                         rate_control_rate_update(local, sband, sta,
 259                                                  IEEE80211_RC_HT_CHANGED,
 260                                                  channel_type);
 261                 rcu_read_unlock();
 262
 263                 if (beacon_htcap_ie)
 264                         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 265                                 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
 266         }
 267
 268         ht_opmode = le16_to_cpu(hti->operation_mode);
 269
 270         /* if bss configuration changed store the new one */
 271         if (sdata->ht_opmode_valid != enable_ht ||
 272             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 273             prev_chantype != channel_type) {
 274                 changed |= BSS_CHANGED_HT;
 275                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 276                 sdata->ht_opmode_valid = enable_ht;
 277         }
 278
 279         return changed;
 280 }
 281
 282 /* frame sending functions */
 283
 284 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 285                                            const u8 *bssid, u16 stype, u16 reason,
 286                                            void *cookie, bool send_frame)
 287 {
 288         struct ieee80211_local *local = sdata->local;
 289         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 290         struct sk_buff *skb;
 291         struct ieee80211_mgmt *mgmt;
 292
 293         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 294         if (!skb)
 295                 return;
 296
 297         skb_reserve(skb, local->hw.extra_tx_headroom);
 298
 299         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 300         memset(mgmt, 0, 24);
 301         memcpy(mgmt->da, bssid, ETH_ALEN);
 302         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 303         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 304         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 305         skb_put(skb, 2);
 306         /* u.deauth.reason_code == u.disassoc.reason_code */
 307         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 308
 309         if (stype == IEEE80211_STYPE_DEAUTH)
 310                 if (cookie)
 311                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 312                 else
 313                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 314         else
 315                 if (cookie)
 316                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 317                 else
 318                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 319         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 320                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 321
 322         if (send_frame)
 323                 ieee80211_tx_skb(sdata, skb);
 324         else
 325                 kfree_skb(skb);
 326 }
 327
 328 void ieee80211_send_pspoll(struct ieee80211_local *local,
 329                            struct ieee80211_sub_if_data *sdata)
 330 {
 331         struct ieee80211_pspoll *pspoll;
 332         struct sk_buff *skb;
 333
 334         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 335         if (!skb)
 336                 return;
 337
 338         pspoll = (struct ieee80211_pspoll *) skb->data;
 339         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 340
 341         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 342         ieee80211_tx_skb(sdata, skb);
 343 }
 344
 345 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 346                              struct ieee80211_sub_if_data *sdata,
 347                              int powersave)
 348 {
 349         struct sk_buff *skb;
 350         struct ieee80211_hdr_3addr *nullfunc;
 351         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 352
 353         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 354         if (!skb)
 355                 return;
 356
 357         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 358         if (powersave)
 359                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 360
 361         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 362         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 363                             IEEE80211_STA_CONNECTION_POLL))
 364                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 365
 366         ieee80211_tx_skb(sdata, skb);
 367 }
 368
 369 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 370                                           struct ieee80211_sub_if_data *sdata)
 371 {
 372         struct sk_buff *skb;
 373         struct ieee80211_hdr *nullfunc;
 374         __le16 fc;
 375
 376         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 377                 return;
 378
 379         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 380         if (!skb)
 381                 return;
 382
 383         skb_reserve(skb, local->hw.extra_tx_headroom);
 384
 385         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 386         memset(nullfunc, 0, 30);
 387         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 388                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 389         nullfunc->frame_control = fc;
 390         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 391         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 392         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 393         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 394
 395         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 396         ieee80211_tx_skb(sdata, skb);
 397 }
 398
 399 /* spectrum management related things */
 400 static void ieee80211_chswitch_work(struct work_struct *work)
 401 {
 402         struct ieee80211_sub_if_data *sdata =
 403                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 404         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 405
 406         if (!ieee80211_sdata_running(sdata))
 407                 return;
 408
 409         mutex_lock(&ifmgd->mtx);
 410         if (!ifmgd->associated)
 411                 goto out;
 412
 413         sdata->local->oper_channel = sdata->local->csa_channel;
 414         if (!sdata->local->ops->channel_switch) {
 415                 /* call "hw_config" only if doing sw channel switch */
 416                 ieee80211_hw_config(sdata->local,
 417                         IEEE80211_CONF_CHANGE_CHANNEL);
 418         } else {
 419                 /* update the device channel directly */
 420                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
 421         }
 422
 423         /* XXX: shouldn't really modify cfg80211-owned data! */
 424         ifmgd->associated->channel = sdata->local->oper_channel;
 425
 426         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 427                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 428  out:
 429         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 430         mutex_unlock(&ifmgd->mtx);
 431 }
 432
 433 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 434 {
 435         struct ieee80211_sub_if_data *sdata;
 436         struct ieee80211_if_managed *ifmgd;
 437
 438         sdata = vif_to_sdata(vif);
 439         ifmgd = &sdata->u.mgd;
 440
 441         trace_api_chswitch_done(sdata, success);
 442         if (!success) {
 443                 /*
 444                  * If the channel switch was not successful, stay
 445                  * around on the old channel. We currently lack
 446                  * good handling of this situation, possibly we
 447                  * should just drop the association.
 448                  */
 449                 sdata->local->csa_channel = sdata->local->oper_channel;
 450         }
 451
 452         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 453 }
 454 EXPORT_SYMBOL(ieee80211_chswitch_done);
 455
 456 static void ieee80211_chswitch_timer(unsigned long data)
 457 {
 458         struct ieee80211_sub_if_data *sdata =
 459                 (struct ieee80211_sub_if_data *) data;
 460         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 461
 462         if (sdata->local->quiescing) {
 463                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 464                 return;
 465         }
 466
 467         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 468 }
 469
 470 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 471                                       struct ieee80211_channel_sw_ie *sw_elem,
 472                                       struct ieee80211_bss *bss,
 473                                       u64 timestamp)
 474 {
 475         struct cfg80211_bss *cbss =
 476                 container_of((void *)bss, struct cfg80211_bss, priv);
 477         struct ieee80211_channel *new_ch;
 478         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 479         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 480                                                       cbss->channel->band);
 481
 482         ASSERT_MGD_MTX(ifmgd);
 483
 484         if (!ifmgd->associated)
 485                 return;
 486
 487         if (sdata->local->scanning)
 488                 return;
 489
 490         /* Disregard subsequent beacons if we are already running a timer
 491            processing a CSA */
 492
 493         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 494                 return;
 495
 496         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 497         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 498                 return;
 499
 500         sdata->local->csa_channel = new_ch;
 501
 502         if (sdata->local->ops->channel_switch) {
 503                 /* use driver's channel switch callback */
 504                 struct ieee80211_channel_switch ch_switch;
 505                 memset(&ch_switch, 0, sizeof(ch_switch));
 506                 ch_switch.timestamp = timestamp;
 507                 if (sw_elem->mode) {
 508                         ch_switch.block_tx = true;
 509                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 510                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 511                 }
 512                 ch_switch.channel = new_ch;
 513                 ch_switch.count = sw_elem->count;
 514                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 515                 drv_channel_switch(sdata->local, &ch_switch);
 516                 return;
 517         }
 518
 519         /* channel switch handled in software */
 520         if (sw_elem->count <= 1) {
 521                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 522         } else {
 523                 if (sw_elem->mode)
 524                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 525                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 526                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 527                 mod_timer(&ifmgd->chswitch_timer,
 528                           jiffies +
 529                           msecs_to_jiffies(sw_elem->count *
 530                                            cbss->beacon_interval));
 531         }
 532 }
 533
 534 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 535                                         u16 capab_info, u8 *pwr_constr_elem,
 536                                         u8 pwr_constr_elem_len)
 537 {
 538         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 539
 540         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 541                 return;
 542
 543         /* Power constraint IE length should be 1 octet */
 544         if (pwr_constr_elem_len != 1)
 545                 return;
 546
 547         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 548             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 549                 sdata->local->power_constr_level = *pwr_constr_elem;
 550                 ieee80211_hw_config(sdata->local, 0);
 551         }
 552 }
 553
 554 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 555 {
 556         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 557         struct ieee80211_local *local = sdata->local;
 558         struct ieee80211_conf *conf = &local->hw.conf;
 559
 560         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 561                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 562                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 563
 564         local->disable_dynamic_ps = false;
 565         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 566 }
 567 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 568
 569 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 570 {
 571         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 572         struct ieee80211_local *local = sdata->local;
 573         struct ieee80211_conf *conf = &local->hw.conf;
 574
 575         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 576                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 577                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 578
 579         local->disable_dynamic_ps = true;
 580         conf->dynamic_ps_timeout = 0;
 581         del_timer_sync(&local->dynamic_ps_timer);
 582         ieee80211_queue_work(&local->hw,
 583                              &local->dynamic_ps_enable_work);
 584 }
 585 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 586
 587 /* powersave */
 588 static void ieee80211_enable_ps(struct ieee80211_local *local,
 589                                 struct ieee80211_sub_if_data *sdata)
 590 {
 591         struct ieee80211_conf *conf = &local->hw.conf;
 592
 593         /*
 594          * If we are scanning right now then the parameters will
 595          * take effect when scan finishes.
 596          */
 597         if (local->scanning)
 598                 return;
 599
 600         if (conf->dynamic_ps_timeout > 0 &&
 601             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 602                 mod_timer(&local->dynamic_ps_timer, jiffies +
 603                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 604         } else {
 605                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 606                         ieee80211_send_nullfunc(local, sdata, 1);
 607
 608                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 609                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 610                         return;
 611
 612                 conf->flags |= IEEE80211_CONF_PS;
 613                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 614         }
 615 }
 616
 617 static void ieee80211_change_ps(struct ieee80211_local *local)
 618 {
 619         struct ieee80211_conf *conf = &local->hw.conf;
 620
 621         if (local->ps_sdata) {
 622                 ieee80211_enable_ps(local, local->ps_sdata);
 623         } else if (conf->flags & IEEE80211_CONF_PS) {
 624                 conf->flags &= ~IEEE80211_CONF_PS;
 625                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 626                 del_timer_sync(&local->dynamic_ps_timer);
 627                 cancel_work_sync(&local->dynamic_ps_enable_work);
 628         }
 629 }
 630
 631 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 632 {
 633         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 634         struct sta_info *sta = NULL;
 635         bool authorized = false;
 636
 637         if (!mgd->powersave)
 638                 return false;
 639
 640         if (mgd->broken_ap)
 641                 return false;
 642
 643         if (!mgd->associated)
 644                 return false;
 645
 646         if (!mgd->associated->beacon_ies)
 647                 return false;
 648
 649         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 650                           IEEE80211_STA_CONNECTION_POLL))
 651                 return false;
 652
 653         rcu_read_lock();
 654         sta = sta_info_get(sdata, mgd->bssid);
 655         if (sta)
 656                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 657         rcu_read_unlock();
 658
 659         return authorized;
 660 }
 661
 662 /* need to hold RTNL or interface lock */
 663 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 664 {
 665         struct ieee80211_sub_if_data *sdata, *found = NULL;
 666         int count = 0;
 667         int timeout;
 668
 669         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 670                 local->ps_sdata = NULL;
 671                 return;
 672         }
 673
 674         if (!list_empty(&local->work_list)) {
 675                 local->ps_sdata = NULL;
 676                 goto change;
 677         }
 678
 679         list_for_each_entry(sdata, &local->interfaces, list) {
 680                 if (!ieee80211_sdata_running(sdata))
 681                         continue;
 682                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 683                         /* If an AP vif is found, then disable PS
 684                          * by setting the count to zero thereby setting
 685                          * ps_sdata to NULL.
 686                          */
 687                         count = 0;
 688                         break;
 689                 }
 690                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 691                         continue;
 692                 found = sdata;
 693                 count++;
 694         }
 695
 696         if (count == 1 && ieee80211_powersave_allowed(found)) {
 697                 struct ieee80211_conf *conf = &local->hw.conf;
 698                 s32 beaconint_us;
 699
 700                 if (latency < 0)
 701                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 702
 703                 beaconint_us = ieee80211_tu_to_usec(
 704                                         found->vif.bss_conf.beacon_int);
 705
 706                 timeout = local->dynamic_ps_forced_timeout;
 707                 if (timeout < 0) {
 708                         /*
 709                          * Go to full PSM if the user configures a very low
 710                          * latency requirement.
 711                          * The 2000 second value is there for compatibility
 712                          * until the PM_QOS_NETWORK_LATENCY is configured
 713                          * with real values.
 714                          */
 715                         if (latency > (1900 * USEC_PER_MSEC) &&
 716                             latency != (2000 * USEC_PER_SEC))
 717                                 timeout = 0;
 718                         else
 719                                 timeout = 100;
 720                 }
 721                 local->dynamic_ps_user_timeout = timeout;
 722                 if (!local->disable_dynamic_ps)
 723                         conf->dynamic_ps_timeout =
 724                                 local->dynamic_ps_user_timeout;
 725
 726                 if (beaconint_us > latency) {
 727                         local->ps_sdata = NULL;
 728                 } else {
 729                         struct ieee80211_bss *bss;
 730                         int maxslp = 1;
 731                         u8 dtimper;
 732
 733                         bss = (void *)found->u.mgd.associated->priv;
 734                         dtimper = bss->dtim_period;
 735
 736                         /* If the TIM IE is invalid, pretend the value is 1 */
 737                         if (!dtimper)
 738                                 dtimper = 1;
 739                         else if (dtimper > 1)
 740                                 maxslp = min_t(int, dtimper,
 741                                                     latency / beaconint_us);
 742
 743                         local->hw.conf.max_sleep_period = maxslp;
 744                         local->hw.conf.ps_dtim_period = dtimper;
 745                         local->ps_sdata = found;
 746                 }
 747         } else {
 748                 local->ps_sdata = NULL;
 749         }
 750
 751  change:
 752         ieee80211_change_ps(local);
 753 }
 754
 755 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 756 {
 757         struct ieee80211_local *local =
 758                 container_of(work, struct ieee80211_local,
 759                              dynamic_ps_disable_work);
 760
 761         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 762                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 763                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 764         }
 765
 766         ieee80211_wake_queues_by_reason(&local->hw,
 767                                         IEEE80211_QUEUE_STOP_REASON_PS);
 768 }
 769
 770 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 771 {
 772         struct ieee80211_local *local =
 773                 container_of(work, struct ieee80211_local,
 774                              dynamic_ps_enable_work);
 775         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 776         struct ieee80211_if_managed *ifmgd;
 777         unsigned long flags;
 778         int q;
 779
 780         /* can only happen when PS was just disabled anyway */
 781         if (!sdata)
 782                 return;
 783
 784         ifmgd = &sdata->u.mgd;
 785
 786         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 787                 return;
 788
 789         if (!local->disable_dynamic_ps &&
 790             local->hw.conf.dynamic_ps_timeout > 0) {
 791                 /* don't enter PS if TX frames are pending */
 792                 if (drv_tx_frames_pending(local)) {
 793                         mod_timer(&local->dynamic_ps_timer, jiffies +
 794                                   msecs_to_jiffies(
 795                                   local->hw.conf.dynamic_ps_timeout));
 796                         return;
 797                 }
 798
 799                 /*
 800                  * transmission can be stopped by others which leads to
 801                  * dynamic_ps_timer expiry. Postpone the ps timer if it
 802                  * is not the actual idle state.
 803                  */
 804                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 805                 for (q = 0; q < local->hw.queues; q++) {
 806                         if (local->queue_stop_reasons[q]) {
 807                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
 808                                                        flags);
 809                                 mod_timer(&local->dynamic_ps_timer, jiffies +
 810                                           msecs_to_jiffies(
 811                                           local->hw.conf.dynamic_ps_timeout));
 812                                 return;
 813                         }
 814                 }
 815                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 816         }
 817
 818         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 819             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) {
 820                 netif_tx_stop_all_queues(sdata->dev);
 821
 822                 if (drv_tx_frames_pending(local))
 823                         mod_timer(&local->dynamic_ps_timer, jiffies +
 824                                   msecs_to_jiffies(
 825                                   local->hw.conf.dynamic_ps_timeout));
 826                 else {
 827                         ieee80211_send_nullfunc(local, sdata, 1);
 828                         /* Flush to get the tx status of nullfunc frame */
 829                         drv_flush(local, false);
 830                 }
 831         }
 832
 833         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 834               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 835             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 836                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 837                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 838                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 839         }
 840
 841         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 842                 netif_tx_wake_all_queues(sdata->dev);
 843 }
 844
 845 void ieee80211_dynamic_ps_timer(unsigned long data)
 846 {
 847         struct ieee80211_local *local = (void *) data;
 848
 849         if (local->quiescing || local->suspended)
 850                 return;
 851
 852         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 853 }
 854
 855 /* MLME */
 856 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 857                                      struct ieee80211_sub_if_data *sdata,
 858                                      u8 *wmm_param, size_t wmm_param_len)
 859 {
 860         struct ieee80211_tx_queue_params params;
 861         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 862         size_t left;
 863         int count;
 864         u8 *pos, uapsd_queues = 0;
 865
 866         if (!local->ops->conf_tx)
 867                 return;
 868
 869         if (local->hw.queues < 4)
 870                 return;
 871
 872         if (!wmm_param)
 873                 return;
 874
 875         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 876                 return;
 877
 878         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 879                 uapsd_queues = local->uapsd_queues;
 880
 881         count = wmm_param[6] & 0x0f;
 882         if (count == ifmgd->wmm_last_param_set)
 883                 return;
 884         ifmgd->wmm_last_param_set = count;
 885
 886         pos = wmm_param + 8;
 887         left = wmm_param_len - 8;
 888
 889         memset(&params, 0, sizeof(params));
 890
 891         local->wmm_acm = 0;
 892         for (; left >= 4; left -= 4, pos += 4) {
 893                 int aci = (pos[0] >> 5) & 0x03;
 894                 int acm = (pos[0] >> 4) & 0x01;
 895                 bool uapsd = false;
 896                 int queue;
 897
 898                 switch (aci) {
 899                 case 1: /* AC_BK */
 900                         queue = 3;
 901                         if (acm)
 902                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 903                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 904                                 uapsd = true;
 905                         break;
 906                 case 2: /* AC_VI */
 907                         queue = 1;
 908                         if (acm)
 909                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 910                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 911                                 uapsd = true;
 912                         break;
 913                 case 3: /* AC_VO */
 914                         queue = 0;
 915                         if (acm)
 916                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 917                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 918                                 uapsd = true;
 919                         break;
 920                 case 0: /* AC_BE */
 921                 default:
 922                         queue = 2;
 923                         if (acm)
 924                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 925                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 926                                 uapsd = true;
 927                         break;
 928                 }
 929
 930                 params.aifs = pos[0] & 0x0f;
 931                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 932                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 933                 params.txop = get_unaligned_le16(pos + 2);
 934                 params.uapsd = uapsd;
 935
 936 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 937                 wiphy_debug(local->hw.wiphy,
 938                             "WMM queue=%d aci=%d acm=%d aifs=%d "
 939                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 940                             queue, aci, acm,
 941                             params.aifs, params.cw_min, params.cw_max,
 942                             params.txop, params.uapsd);
 943 #endif
 944                 sdata->tx_conf[queue] = params;
 945                 if (drv_conf_tx(local, sdata, queue, &params))
 946                         wiphy_debug(local->hw.wiphy,
 947                                     "failed to set TX queue parameters for queue %d\n",
 948                                     queue);
 949         }
 950
 951         /* enable WMM or activate new settings */
 952         sdata->vif.bss_conf.qos = true;
 953         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 954 }
 955
 956 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 957                                            u16 capab, bool erp_valid, u8 erp)
 958 {
 959         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 960         u32 changed = 0;
 961         bool use_protection;
 962         bool use_short_preamble;
 963         bool use_short_slot;
 964
 965         if (erp_valid) {
 966                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 967                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 968         } else {
 969                 use_protection = false;
 970                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 971         }
 972
 973         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 974         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 975                 use_short_slot = true;
 976
 977         if (use_protection != bss_conf->use_cts_prot) {
 978                 bss_conf->use_cts_prot = use_protection;
 979                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 980         }
 981
 982         if (use_short_preamble != bss_conf->use_short_preamble) {
 983                 bss_conf->use_short_preamble = use_short_preamble;
 984                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 985         }
 986
 987         if (use_short_slot != bss_conf->use_short_slot) {
 988                 bss_conf->use_short_slot = use_short_slot;
 989                 changed |= BSS_CHANGED_ERP_SLOT;
 990         }
 991
 992         return changed;
 993 }
 994
 995 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 996                                      struct cfg80211_bss *cbss,
 997                                      u32 bss_info_changed)
 998 {
 999         struct ieee80211_bss *bss = (void *)cbss->priv;
1000         struct ieee80211_local *local = sdata->local;
1001         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1002
1003         bss_info_changed |= BSS_CHANGED_ASSOC;
1004         /* set timing information */
1005         bss_conf->beacon_int = cbss->beacon_interval;
1006         bss_conf->timestamp = cbss->tsf;
1007
1008         bss_info_changed |= BSS_CHANGED_BEACON_INT;
1009         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1010                 cbss->capability, bss->has_erp_value, bss->erp_value);
1011
1012         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1013                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1014
1015         sdata->u.mgd.associated = cbss;
1016         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1017
1018         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1019
1020         /* just to be sure */
1021         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1022                                 IEEE80211_STA_BEACON_POLL);
1023
1024         ieee80211_led_assoc(local, 1);
1025
1026         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1027                 bss_conf->dtim_period = bss->dtim_period;
1028         else
1029                 bss_conf->dtim_period = 0;
1030
1031         bss_conf->assoc = 1;
1032         /*
1033          * For now just always ask the driver to update the basic rateset
1034          * when we have associated, we aren't checking whether it actually
1035          * changed or not.
1036          */
1037         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
1038
1039         /* And the BSSID changed - we're associated now */
1040         bss_info_changed |= BSS_CHANGED_BSSID;
1041
1042         /* Tell the driver to monitor connection quality (if supported) */
1043         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
1044             bss_conf->cqm_rssi_thold)
1045                 bss_info_changed |= BSS_CHANGED_CQM;
1046
1047         /* Enable ARP filtering */
1048         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1049                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1050                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1051         }
1052
1053         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1054
1055         mutex_lock(&local->iflist_mtx);
1056         ieee80211_recalc_ps(local, -1);
1057         ieee80211_recalc_smps(local);
1058         mutex_unlock(&local->iflist_mtx);
1059
1060         netif_tx_start_all_queues(sdata->dev);
1061         netif_carrier_on(sdata->dev);
1062 }
1063
1064 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1065                                    bool remove_sta, bool tx)
1066 {
1067         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1068         struct ieee80211_local *local = sdata->local;
1069         struct sta_info *sta;
1070         u32 changed = 0, config_changed = 0;
1071         u8 bssid[ETH_ALEN];
1072
1073         ASSERT_MGD_MTX(ifmgd);
1074
1075         if (WARN_ON(!ifmgd->associated))
1076                 return;
1077
1078         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1079
1080         ifmgd->associated = NULL;
1081         memset(ifmgd->bssid, 0, ETH_ALEN);
1082
1083         /*
1084          * we need to commit the associated = NULL change because the
1085          * scan code uses that to determine whether this iface should
1086          * go to/wake up from powersave or not -- and could otherwise
1087          * wake the queues erroneously.
1088          */
1089         smp_mb();
1090
1091         /*
1092          * Thus, we can only afterwards stop the queues -- to account
1093          * for the case where another CPU is finishing a scan at this
1094          * time -- we don't want the scan code to enable queues.
1095          */
1096
1097         netif_tx_stop_all_queues(sdata->dev);
1098         netif_carrier_off(sdata->dev);
1099
1100         mutex_lock(&local->sta_mtx);
1101         sta = sta_info_get(sdata, bssid);
1102         if (sta) {
1103                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1104                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1105         }
1106         mutex_unlock(&local->sta_mtx);
1107
1108         changed |= ieee80211_reset_erp_info(sdata);
1109
1110         ieee80211_led_assoc(local, 0);
1111         changed |= BSS_CHANGED_ASSOC;
1112         sdata->vif.bss_conf.assoc = false;
1113
1114         ieee80211_set_wmm_default(sdata);
1115
1116         /* channel(_type) changes are handled by ieee80211_hw_config */
1117         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1118
1119         /* on the next assoc, re-program HT parameters */
1120         sdata->ht_opmode_valid = false;
1121
1122         local->power_constr_level = 0;
1123
1124         del_timer_sync(&local->dynamic_ps_timer);
1125         cancel_work_sync(&local->dynamic_ps_enable_work);
1126
1127         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1128                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1129                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1130         }
1131         local->ps_sdata = NULL;
1132
1133         ieee80211_hw_config(local, config_changed);
1134
1135         /* Disable ARP filtering */
1136         if (sdata->vif.bss_conf.arp_filter_enabled) {
1137                 sdata->vif.bss_conf.arp_filter_enabled = false;
1138                 changed |= BSS_CHANGED_ARP_FILTER;
1139         }
1140
1141         /* The BSSID (not really interesting) and HT changed */
1142         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1143         ieee80211_bss_info_change_notify(sdata, changed);
1144
1145         /* remove AP and TDLS peers */
1146         if (remove_sta)
1147                 sta_info_flush(local, sdata);
1148
1149         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1150         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1151         del_timer_sync(&sdata->u.mgd.timer);
1152         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1153 }
1154
1155 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1156                              struct ieee80211_hdr *hdr)
1157 {
1158         /*
1159          * We can postpone the mgd.timer whenever receiving unicast frames
1160          * from AP because we know that the connection is working both ways
1161          * at that time. But multicast frames (and hence also beacons) must
1162          * be ignored here, because we need to trigger the timer during
1163          * data idle periods for sending the periodic probe request to the
1164          * AP we're connected to.
1165          */
1166         if (is_multicast_ether_addr(hdr->addr1))
1167                 return;
1168
1169         ieee80211_sta_reset_conn_monitor(sdata);
1170 }
1171
1172 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1173 {
1174         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1175
1176         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1177                               IEEE80211_STA_CONNECTION_POLL)))
1178             return;
1179
1180         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1181                           IEEE80211_STA_BEACON_POLL);
1182         mutex_lock(&sdata->local->iflist_mtx);
1183         ieee80211_recalc_ps(sdata->local, -1);
1184         mutex_unlock(&sdata->local->iflist_mtx);
1185
1186         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1187                 return;
1188
1189         /*
1190          * We've received a probe response, but are not sure whether
1191          * we have or will be receiving any beacons or data, so let's
1192          * schedule the timers again, just in case.
1193          */
1194         ieee80211_sta_reset_beacon_monitor(sdata);
1195
1196         mod_timer(&ifmgd->conn_mon_timer,
1197                   round_jiffies_up(jiffies +
1198                                    IEEE80211_CONNECTION_IDLE_TIME));
1199 }
1200
1201 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1202                              struct ieee80211_hdr *hdr, bool ack)
1203 {
1204         if (!ieee80211_is_data(hdr->frame_control))
1205             return;
1206
1207         if (ack)
1208                 ieee80211_sta_reset_conn_monitor(sdata);
1209
1210         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1211             sdata->u.mgd.probe_send_count > 0) {
1212                 if (ack)
1213                         sdata->u.mgd.probe_send_count = 0;
1214                 else
1215                         sdata->u.mgd.nullfunc_failed = true;
1216                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1217         }
1218 }
1219
1220 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1221 {
1222         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1223         const u8 *ssid;
1224         u8 *dst = ifmgd->associated->bssid;
1225         u8 unicast_limit = max(1, max_probe_tries - 3);
1226
1227         /*
1228          * Try sending broadcast probe requests for the last three
1229          * probe requests after the first ones failed since some
1230          * buggy APs only support broadcast probe requests.
1231          */
1232         if (ifmgd->probe_send_count >= unicast_limit)
1233                 dst = NULL;
1234
1235         /*
1236          * When the hardware reports an accurate Tx ACK status, it's
1237          * better to send a nullfunc frame instead of a probe request,
1238          * as it will kick us off the AP quickly if we aren't associated
1239          * anymore. The timeout will be reset if the frame is ACKed by
1240          * the AP.
1241          */
1242         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1243                 ifmgd->nullfunc_failed = false;
1244                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1245         } else {
1246                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1247                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0,
1248                                          (u32) -1, true, false);
1249         }
1250
1251         ifmgd->probe_send_count++;
1252         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1253         run_again(ifmgd, ifmgd->probe_timeout);
1254 }
1255
1256 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1257                                    bool beacon)
1258 {
1259         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1260         bool already = false;
1261
1262         if (!ieee80211_sdata_running(sdata))
1263                 return;
1264
1265         if (sdata->local->scanning)
1266                 return;
1267
1268         if (sdata->local->tmp_channel)
1269                 return;
1270
1271         mutex_lock(&ifmgd->mtx);
1272
1273         if (!ifmgd->associated)
1274                 goto out;
1275
1276 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1277         if (beacon && net_ratelimit())
1278                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1279                        "- sending probe request\n", sdata->name);
1280 #endif
1281
1282         /*
1283          * The driver/our work has already reported this event or the
1284          * connection monitoring has kicked in and we have already sent
1285          * a probe request. Or maybe the AP died and the driver keeps
1286          * reporting until we disassociate...
1287          *
1288          * In either case we have to ignore the current call to this
1289          * function (except for setting the correct probe reason bit)
1290          * because otherwise we would reset the timer every time and
1291          * never check whether we received a probe response!
1292          */
1293         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1294                             IEEE80211_STA_CONNECTION_POLL))
1295                 already = true;
1296
1297         if (beacon)
1298                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1299         else
1300                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1301
1302         if (already)
1303                 goto out;
1304
1305         mutex_lock(&sdata->local->iflist_mtx);
1306         ieee80211_recalc_ps(sdata->local, -1);
1307         mutex_unlock(&sdata->local->iflist_mtx);
1308
1309         ifmgd->probe_send_count = 0;
1310         ieee80211_mgd_probe_ap_send(sdata);
1311  out:
1312         mutex_unlock(&ifmgd->mtx);
1313 }
1314
1315 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1316                                           struct ieee80211_vif *vif)
1317 {
1318         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1319         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1320         struct sk_buff *skb;
1321         const u8 *ssid;
1322
1323         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1324                 return NULL;
1325
1326         ASSERT_MGD_MTX(ifmgd);
1327
1328         if (!ifmgd->associated)
1329                 return NULL;
1330
1331         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1332         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1333                                         (u32) -1, ssid + 2, ssid[1],
1334                                         NULL, 0, true);
1335
1336         return skb;
1337 }
1338 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1339
1340 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1341 {
1342         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1343         struct ieee80211_local *local = sdata->local;
1344         u8 bssid[ETH_ALEN];
1345
1346         mutex_lock(&ifmgd->mtx);
1347         if (!ifmgd->associated) {
1348                 mutex_unlock(&ifmgd->mtx);
1349                 return;
1350         }
1351
1352         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1353
1354         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1355                sdata->name, bssid);
1356
1357         ieee80211_set_disassoc(sdata, true, true);
1358         mutex_unlock(&ifmgd->mtx);
1359
1360         mutex_lock(&local->mtx);
1361         ieee80211_recalc_idle(local);
1362         mutex_unlock(&local->mtx);
1363         /*
1364          * must be outside lock due to cfg80211,
1365          * but that's not a problem.
1366          */
1367         ieee80211_send_deauth_disassoc(sdata, bssid,
1368                                        IEEE80211_STYPE_DEAUTH,
1369                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1370                                        NULL, true);
1371 }
1372
1373 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1374 {
1375         struct ieee80211_sub_if_data *sdata =
1376                 container_of(work, struct ieee80211_sub_if_data,
1377                              u.mgd.beacon_connection_loss_work);
1378
1379         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1380                 __ieee80211_connection_loss(sdata);
1381         else
1382                 ieee80211_mgd_probe_ap(sdata, true);
1383 }
1384
1385 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1386 {
1387         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1388         struct ieee80211_hw *hw = &sdata->local->hw;
1389
1390         trace_api_beacon_loss(sdata);
1391
1392         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1393         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1394 }
1395 EXPORT_SYMBOL(ieee80211_beacon_loss);
1396
1397 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1398 {
1399         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1400         struct ieee80211_hw *hw = &sdata->local->hw;
1401
1402         trace_api_connection_loss(sdata);
1403
1404         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1405         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1406 }
1407 EXPORT_SYMBOL(ieee80211_connection_loss);
1408
1409
1410 static enum rx_mgmt_action __must_check
1411 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1412                          struct ieee80211_mgmt *mgmt, size_t len)
1413 {
1414         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1415         const u8 *bssid = NULL;
1416         u16 reason_code;
1417
1418         if (len < 24 + 2)
1419                 return RX_MGMT_NONE;
1420
1421         ASSERT_MGD_MTX(ifmgd);
1422
1423         bssid = ifmgd->associated->bssid;
1424
1425         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1426
1427         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1428                         sdata->name, bssid, reason_code);
1429
1430         ieee80211_set_disassoc(sdata, true, false);
1431         mutex_lock(&sdata->local->mtx);
1432         ieee80211_recalc_idle(sdata->local);
1433         mutex_unlock(&sdata->local->mtx);
1434
1435         return RX_MGMT_CFG80211_DEAUTH;
1436 }
1437
1438
1439 static enum rx_mgmt_action __must_check
1440 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1441                            struct ieee80211_mgmt *mgmt, size_t len)
1442 {
1443         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1444         u16 reason_code;
1445
1446         if (len < 24 + 2)
1447                 return RX_MGMT_NONE;
1448
1449         ASSERT_MGD_MTX(ifmgd);
1450
1451         if (WARN_ON(!ifmgd->associated))
1452                 return RX_MGMT_NONE;
1453
1454         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1455                 return RX_MGMT_NONE;
1456
1457         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1458
1459         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1460                         sdata->name, mgmt->sa, reason_code);
1461
1462         ieee80211_set_disassoc(sdata, true, false);
1463         mutex_lock(&sdata->local->mtx);
1464         ieee80211_recalc_idle(sdata->local);
1465         mutex_unlock(&sdata->local->mtx);
1466         return RX_MGMT_CFG80211_DISASSOC;
1467 }
1468
1469
1470 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1471                                     struct ieee80211_mgmt *mgmt, size_t len)
1472 {
1473         struct ieee80211_sub_if_data *sdata = wk->sdata;
1474         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1475         struct ieee80211_local *local = sdata->local;
1476         struct ieee80211_supported_band *sband;
1477         struct sta_info *sta;
1478         struct cfg80211_bss *cbss = wk->assoc.bss;
1479         u8 *pos;
1480         u32 rates, basic_rates;
1481         u16 capab_info, aid;
1482         struct ieee802_11_elems elems;
1483         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1484         u32 changed = 0;
1485         int i, j, err;
1486         bool have_higher_than_11mbit = false;
1487         u16 ap_ht_cap_flags;
1488         int min_rate = INT_MAX, min_rate_index = -1;
1489
1490         /* AssocResp and ReassocResp have identical structure */
1491
1492         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1493         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1494
1495         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1496                 printk(KERN_DEBUG
1497                        "%s: invalid AID value 0x%x; bits 15:14 not set\n",
1498                        sdata->name, aid);
1499         aid &= ~(BIT(15) | BIT(14));
1500
1501         ifmgd->broken_ap = false;
1502
1503         if (aid == 0 || aid > IEEE80211_MAX_AID) {
1504                 printk(KERN_DEBUG
1505                        "%s: invalid AID value %d (out of range), turn off PS\n",
1506                        sdata->name, aid);
1507                 aid = 0;
1508                 ifmgd->broken_ap = true;
1509         }
1510
1511         pos = mgmt->u.assoc_resp.variable;
1512         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1513
1514         if (!elems.supp_rates) {
1515                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1516                        sdata->name);
1517                 return false;
1518         }
1519
1520         ifmgd->aid = aid;
1521
1522         mutex_lock(&sdata->local->sta_mtx);
1523         /*
1524          * station info was already allocated and inserted before
1525          * the association and should be available to us
1526          */
1527         sta = sta_info_get_rx(sdata, cbss->bssid);
1528         if (WARN_ON(!sta)) {
1529                 mutex_unlock(&sdata->local->sta_mtx);
1530                 return false;
1531         }
1532
1533         set_sta_flag(sta, WLAN_STA_AUTH);
1534         set_sta_flag(sta, WLAN_STA_ASSOC);
1535         set_sta_flag(sta, WLAN_STA_ASSOC_AP);
1536         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1537                 set_sta_flag(sta, WLAN_STA_AUTHORIZED);
1538
1539         rates = 0;
1540         basic_rates = 0;
1541         sband = local->hw.wiphy->bands[wk->chan->band];
1542
1543         for (i = 0; i < elems.supp_rates_len; i++) {
1544                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1545                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1546
1547                 if (rate > 110)
1548                         have_higher_than_11mbit = true;
1549
1550                 for (j = 0; j < sband->n_bitrates; j++) {
1551                         if (sband->bitrates[j].bitrate == rate) {
1552                                 rates |= BIT(j);
1553                                 if (is_basic)
1554                                         basic_rates |= BIT(j);
1555                                 if (rate < min_rate) {
1556                                         min_rate = rate;
1557                                         min_rate_index = j;
1558                                 }
1559                                 break;
1560                         }
1561                 }
1562         }
1563
1564         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1565                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1566                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1567
1568                 if (rate > 110)
1569                         have_higher_than_11mbit = true;
1570
1571                 for (j = 0; j < sband->n_bitrates; j++) {
1572                         if (sband->bitrates[j].bitrate == rate) {
1573                                 rates |= BIT(j);
1574                                 if (is_basic)
1575                                         basic_rates |= BIT(j);
1576                                 if (rate < min_rate) {
1577                                         min_rate = rate;
1578                                         min_rate_index = j;
1579                                 }
1580                                 break;
1581                         }
1582                 }
1583         }
1584
1585         /*
1586          * some buggy APs don't advertise basic_rates. use the lowest
1587          * supported rate instead.
1588          */
1589         if (unlikely(!basic_rates) && min_rate_index >= 0) {
1590                 printk(KERN_DEBUG "%s: No basic rates in AssocResp. "
1591                        "Using min supported rate instead.\n", sdata->name);
1592                 basic_rates = BIT(min_rate_index);
1593         }
1594
1595         sta->sta.supp_rates[wk->chan->band] = rates;
1596         sdata->vif.bss_conf.basic_rates = basic_rates;
1597
1598         /* cf. IEEE 802.11 9.2.12 */
1599         if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1600             have_higher_than_11mbit)
1601                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1602         else
1603                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1604
1605         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1606                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1607                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1608
1609         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1610
1611         rate_control_rate_init(sta);
1612
1613         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1614                 set_sta_flag(sta, WLAN_STA_MFP);
1615
1616         if (elems.wmm_param)
1617                 set_sta_flag(sta, WLAN_STA_WME);
1618
1619         /* sta_info_reinsert will also unlock the mutex lock */
1620         err = sta_info_reinsert(sta);
1621         sta = NULL;
1622         if (err) {
1623                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1624                        " the AP (error %d)\n", sdata->name, err);
1625                 return false;
1626         }
1627
1628         /*
1629          * Always handle WMM once after association regardless
1630          * of the first value the AP uses. Setting -1 here has
1631          * that effect because the AP values is an unsigned
1632          * 4-bit value.
1633          */
1634         ifmgd->wmm_last_param_set = -1;
1635
1636         if (elems.wmm_param)
1637                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1638                                          elems.wmm_param_len);
1639         else
1640                 ieee80211_set_wmm_default(sdata);
1641
1642         local->oper_channel = wk->chan;
1643
1644         if (elems.ht_info_elem && elems.wmm_param &&
1645             (sdata->local->hw.queues >= 4) &&
1646             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1647                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1648                                                cbss->bssid, ap_ht_cap_flags,
1649                                                false);
1650
1651         /* set AID and assoc capability,
1652          * ieee80211_set_associated() will tell the driver */
1653         bss_conf->aid = aid;
1654         bss_conf->assoc_capability = capab_info;
1655         ieee80211_set_associated(sdata, cbss, changed);
1656
1657         /*
1658          * If we're using 4-addr mode, let the AP know that we're
1659          * doing so, so that it can create the STA VLAN on its side
1660          */
1661         if (ifmgd->use_4addr)
1662                 ieee80211_send_4addr_nullfunc(local, sdata);
1663
1664         /*
1665          * Start timer to probe the connection to the AP now.
1666          * Also start the timer that will detect beacon loss.
1667          */
1668         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1669         ieee80211_sta_reset_beacon_monitor(sdata);
1670
1671         return true;
1672 }
1673
1674
1675 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1676                                   struct ieee80211_mgmt *mgmt,
1677                                   size_t len,
1678                                   struct ieee80211_rx_status *rx_status,
1679                                   struct ieee802_11_elems *elems,
1680                                   bool beacon)
1681 {
1682         struct ieee80211_local *local = sdata->local;
1683         int freq;
1684         struct ieee80211_bss *bss;
1685         struct ieee80211_channel *channel;
1686         bool need_ps = false;
1687
1688         if (sdata->u.mgd.associated) {
1689                 bss = (void *)sdata->u.mgd.associated->priv;
1690                 /* not previously set so we may need to recalc */
1691                 need_ps = !bss->dtim_period;
1692         }
1693
1694         if (elems->ds_params && elems->ds_params_len == 1)
1695                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1696                                                       rx_status->band);
1697         else
1698                 freq = rx_status->freq;
1699
1700         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1701
1702         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1703                 return;
1704
1705         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1706                                         channel, beacon);
1707         if (bss)
1708                 ieee80211_rx_bss_put(local, bss);
1709
1710         if (!sdata->u.mgd.associated)
1711                 return;
1712
1713         if (need_ps) {
1714                 mutex_lock(&local->iflist_mtx);
1715                 ieee80211_recalc_ps(local, -1);
1716                 mutex_unlock(&local->iflist_mtx);
1717         }
1718
1719         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1720             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1721                                                         ETH_ALEN) == 0)) {
1722                 struct ieee80211_channel_sw_ie *sw_elem =
1723                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1724                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1725                                                  bss, rx_status->mactime);
1726         }
1727 }
1728
1729
1730 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1731                                          struct sk_buff *skb)
1732 {
1733         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1734         struct ieee80211_if_managed *ifmgd;
1735         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1736         size_t baselen, len = skb->len;
1737         struct ieee802_11_elems elems;
1738
1739         ifmgd = &sdata->u.mgd;
1740
1741         ASSERT_MGD_MTX(ifmgd);
1742
1743         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1744                 return; /* ignore ProbeResp to foreign address */
1745
1746         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1747         if (baselen > len)
1748                 return;
1749
1750         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1751                                 &elems);
1752
1753         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1754
1755         if (ifmgd->associated &&
1756             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1757                 ieee80211_reset_ap_probe(sdata);
1758 }
1759
1760 /*
1761  * This is the canonical list of information elements we care about,
1762  * the filter code also gives us all changes to the Microsoft OUI
1763  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1764  *
1765  * We implement beacon filtering in software since that means we can
1766  * avoid processing the frame here and in cfg80211, and userspace
1767  * will not be able to tell whether the hardware supports it or not.
1768  *
1769  * XXX: This list needs to be dynamic -- userspace needs to be able to
1770  *      add items it requires. It also needs to be able to tell us to
1771  *      look out for other vendor IEs.
1772  */
1773 static const u64 care_about_ies =
1774         (1ULL << WLAN_EID_COUNTRY) |
1775         (1ULL << WLAN_EID_ERP_INFO) |
1776         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1777         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1778         (1ULL << WLAN_EID_HT_CAPABILITY) |
1779         (1ULL << WLAN_EID_HT_INFORMATION);
1780
1781 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1782                                      struct ieee80211_mgmt *mgmt,
1783                                      size_t len,
1784                                      struct ieee80211_rx_status *rx_status)
1785 {
1786         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1787         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1788         size_t baselen;
1789         struct ieee802_11_elems elems;
1790         struct ieee80211_local *local = sdata->local;
1791         u32 changed = 0;
1792         bool erp_valid, directed_tim = false;
1793         u8 erp_value = 0;
1794         u32 ncrc;
1795         u8 *bssid;
1796
1797         ASSERT_MGD_MTX(ifmgd);
1798
1799         /* Process beacon from the current BSS */
1800         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1801         if (baselen > len)
1802                 return;
1803
1804         if (rx_status->freq != local->hw.conf.channel->center_freq)
1805                 return;
1806
1807         /*
1808          * We might have received a number of frames, among them a
1809          * disassoc frame and a beacon...
1810          */
1811         if (!ifmgd->associated)
1812                 return;
1813
1814         bssid = ifmgd->associated->bssid;
1815
1816         /*
1817          * And in theory even frames from a different AP we were just
1818          * associated to a split-second ago!
1819          */
1820         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1821                 return;
1822
1823         /* Track average RSSI from the Beacon frames of the current AP */
1824         ifmgd->last_beacon_signal = rx_status->signal;
1825         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1826                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1827                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1828                 ifmgd->last_cqm_event_signal = 0;
1829                 ifmgd->count_beacon_signal = 1;
1830                 ifmgd->last_ave_beacon_signal = 0;
1831         } else {
1832                 ifmgd->ave_beacon_signal =
1833                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1834                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1835                          ifmgd->ave_beacon_signal) / 16;
1836                 ifmgd->count_beacon_signal++;
1837         }
1838
1839         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
1840             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
1841                 int sig = ifmgd->ave_beacon_signal;
1842                 int last_sig = ifmgd->last_ave_beacon_signal;
1843
1844                 /*
1845                  * if signal crosses either of the boundaries, invoke callback
1846                  * with appropriate parameters
1847                  */
1848                 if (sig > ifmgd->rssi_max_thold &&
1849                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
1850                         ifmgd->last_ave_beacon_signal = sig;
1851                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
1852                 } else if (sig < ifmgd->rssi_min_thold &&
1853                            (last_sig >= ifmgd->rssi_max_thold ||
1854                            last_sig == 0)) {
1855                         ifmgd->last_ave_beacon_signal = sig;
1856                         drv_rssi_callback(local, RSSI_EVENT_LOW);
1857                 }
1858         }
1859
1860         if (bss_conf->cqm_rssi_thold &&
1861             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1862             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1863                 int sig = ifmgd->ave_beacon_signal / 16;
1864                 int last_event = ifmgd->last_cqm_event_signal;
1865                 int thold = bss_conf->cqm_rssi_thold;
1866                 int hyst = bss_conf->cqm_rssi_hyst;
1867                 if (sig < thold &&
1868                     (last_event == 0 || sig < last_event - hyst)) {
1869                         ifmgd->last_cqm_event_signal = sig;
1870                         ieee80211_cqm_rssi_notify(
1871                                 &sdata->vif,
1872                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1873                                 GFP_KERNEL);
1874                 } else if (sig > thold &&
1875                            (last_event == 0 || sig > last_event + hyst)) {
1876                         ifmgd->last_cqm_event_signal = sig;
1877                         ieee80211_cqm_rssi_notify(
1878                                 &sdata->vif,
1879                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1880                                 GFP_KERNEL);
1881                 }
1882         }
1883
1884         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1885 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1886                 if (net_ratelimit()) {
1887                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1888                                "to a received beacon\n", sdata->name);
1889                 }
1890 #endif
1891                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1892                 mutex_lock(&local->iflist_mtx);
1893                 ieee80211_recalc_ps(local, -1);
1894                 mutex_unlock(&local->iflist_mtx);
1895         }
1896
1897         /*
1898          * Push the beacon loss detection into the future since
1899          * we are processing a beacon from the AP just now.
1900          */
1901         ieee80211_sta_reset_beacon_monitor(sdata);
1902
1903         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1904         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1905                                           len - baselen, &elems,
1906                                           care_about_ies, ncrc);
1907
1908         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1909                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1910                                                    ifmgd->aid);
1911
1912         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1913                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1914                                       true);
1915
1916                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1917                                          elems.wmm_param_len);
1918         }
1919
1920         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1921                 if (directed_tim) {
1922                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1923                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1924                                 ieee80211_hw_config(local,
1925                                                     IEEE80211_CONF_CHANGE_PS);
1926                                 ieee80211_send_nullfunc(local, sdata, 0);
1927                         } else {
1928                                 local->pspolling = true;
1929
1930                                 /*
1931                                  * Here is assumed that the driver will be
1932                                  * able to send ps-poll frame and receive a
1933                                  * response even though power save mode is
1934                                  * enabled, but some drivers might require
1935                                  * to disable power save here. This needs
1936                                  * to be investigated.
1937                                  */
1938                                 ieee80211_send_pspoll(local, sdata);
1939                         }
1940                 }
1941         }
1942
1943         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1944                 return;
1945         ifmgd->beacon_crc = ncrc;
1946         ifmgd->beacon_crc_valid = true;
1947
1948         if (elems.erp_info && elems.erp_info_len >= 1) {
1949                 erp_valid = true;
1950                 erp_value = elems.erp_info[0];
1951         } else {
1952                 erp_valid = false;
1953         }
1954         changed |= ieee80211_handle_bss_capability(sdata,
1955                         le16_to_cpu(mgmt->u.beacon.capab_info),
1956                         erp_valid, erp_value);
1957
1958
1959         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1960             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1961                 struct sta_info *sta;
1962                 struct ieee80211_supported_band *sband;
1963                 u16 ap_ht_cap_flags;
1964
1965                 rcu_read_lock();
1966
1967                 sta = sta_info_get(sdata, bssid);
1968                 if (WARN_ON(!sta)) {
1969                         rcu_read_unlock();
1970                         return;
1971                 }
1972
1973                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1974
1975                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1976                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1977
1978                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1979
1980                 rcu_read_unlock();
1981
1982                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1983                                                bssid, ap_ht_cap_flags, true);
1984         }
1985
1986         /* Note: country IE parsing is done for us by cfg80211 */
1987         if (elems.country_elem) {
1988                 /* TODO: IBSS also needs this */
1989                 if (elems.pwr_constr_elem)
1990                         ieee80211_handle_pwr_constr(sdata,
1991                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1992                                 elems.pwr_constr_elem,
1993                                 elems.pwr_constr_elem_len);
1994         }
1995
1996         ieee80211_bss_info_change_notify(sdata, changed);
1997 }
1998
1999 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2000                                   struct sk_buff *skb)
2001 {
2002         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2003         struct ieee80211_rx_status *rx_status;
2004         struct ieee80211_mgmt *mgmt;
2005         enum rx_mgmt_action rma = RX_MGMT_NONE;
2006         u16 fc;
2007
2008         rx_status = (struct ieee80211_rx_status *) skb->cb;
2009         mgmt = (struct ieee80211_mgmt *) skb->data;
2010         fc = le16_to_cpu(mgmt->frame_control);
2011
2012         mutex_lock(&ifmgd->mtx);
2013
2014         if (ifmgd->associated &&
2015             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
2016                 switch (fc & IEEE80211_FCTL_STYPE) {
2017                 case IEEE80211_STYPE_BEACON:
2018                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
2019                                                  rx_status);
2020                         break;
2021                 case IEEE80211_STYPE_PROBE_RESP:
2022                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
2023                         break;
2024                 case IEEE80211_STYPE_DEAUTH:
2025                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2026                         break;
2027                 case IEEE80211_STYPE_DISASSOC:
2028                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2029                         break;
2030                 case IEEE80211_STYPE_ACTION:
2031                         switch (mgmt->u.action.category) {
2032                         case WLAN_CATEGORY_SPECTRUM_MGMT:
2033                                 ieee80211_sta_process_chanswitch(sdata,
2034                                                 &mgmt->u.action.u.chan_switch.sw_elem,
2035                                                 (void *)ifmgd->associated->priv,
2036                                                 rx_status->mactime);
2037                                 break;
2038                         }
2039                 }
2040                 mutex_unlock(&ifmgd->mtx);
2041
2042                 switch (rma) {
2043                 case RX_MGMT_NONE:
2044                         /* no action */
2045                         break;
2046                 case RX_MGMT_CFG80211_DEAUTH:
2047                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2048                         break;
2049                 case RX_MGMT_CFG80211_DISASSOC:
2050                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2051                         break;
2052                 default:
2053                         WARN(1, "unexpected: %d", rma);
2054                 }
2055                 return;
2056         }
2057
2058         mutex_unlock(&ifmgd->mtx);
2059
2060         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
2061             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
2062                 struct ieee80211_local *local = sdata->local;
2063                 struct ieee80211_work *wk;
2064
2065                 mutex_lock(&local->mtx);
2066                 list_for_each_entry(wk, &local->work_list, list) {
2067                         if (wk->sdata != sdata)
2068                                 continue;
2069
2070                         if (wk->type != IEEE80211_WORK_ASSOC &&
2071                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2072                                 continue;
2073
2074                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
2075                                 continue;
2076                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
2077                                 continue;
2078
2079                         /*
2080                          * Printing the message only here means we can't
2081                          * spuriously print it, but it also means that it
2082                          * won't be printed when the frame comes in before
2083                          * we even tried to associate or in similar cases.
2084                          *
2085                          * Ultimately, I suspect cfg80211 should print the
2086                          * messages instead.
2087                          */
2088                         printk(KERN_DEBUG
2089                                "%s: deauthenticated from %pM (Reason: %u)\n",
2090                                sdata->name, mgmt->bssid,
2091                                le16_to_cpu(mgmt->u.deauth.reason_code));
2092
2093                         list_del_rcu(&wk->list);
2094                         free_work(wk);
2095                         break;
2096                 }
2097                 mutex_unlock(&local->mtx);
2098
2099                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2100         }
2101 }
2102
2103 static void ieee80211_sta_timer(unsigned long data)
2104 {
2105         struct ieee80211_sub_if_data *sdata =
2106                 (struct ieee80211_sub_if_data *) data;
2107         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2108         struct ieee80211_local *local = sdata->local;
2109
2110         if (local->quiescing) {
2111                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2112                 return;
2113         }
2114
2115         ieee80211_queue_work(&local->hw, &sdata->work);
2116 }
2117
2118 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2119                                           u8 *bssid, u8 reason)
2120 {
2121         struct ieee80211_local *local = sdata->local;
2122         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2123
2124         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2125                           IEEE80211_STA_BEACON_POLL);
2126
2127         ieee80211_set_disassoc(sdata, true, true);
2128         mutex_unlock(&ifmgd->mtx);
2129         mutex_lock(&local->mtx);
2130         ieee80211_recalc_idle(local);
2131         mutex_unlock(&local->mtx);
2132         /*
2133          * must be outside lock due to cfg80211,
2134          * but that's not a problem.
2135          */
2136         ieee80211_send_deauth_disassoc(sdata, bssid,
2137                         IEEE80211_STYPE_DEAUTH, reason,
2138                         NULL, true);
2139         mutex_lock(&ifmgd->mtx);
2140 }
2141
2142 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2143 {
2144         struct ieee80211_local *local = sdata->local;
2145         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2146
2147         /* then process the rest of the work */
2148         mutex_lock(&ifmgd->mtx);
2149
2150         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2151                             IEEE80211_STA_CONNECTION_POLL) &&
2152             ifmgd->associated) {
2153                 u8 bssid[ETH_ALEN];
2154                 int max_tries;
2155
2156                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2157
2158                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2159                         max_tries = max_nullfunc_tries;
2160                 else
2161                         max_tries = max_probe_tries;
2162
2163                 /* ACK received for nullfunc probing frame */
2164                 if (!ifmgd->probe_send_count)
2165                         ieee80211_reset_ap_probe(sdata);
2166                 else if (ifmgd->nullfunc_failed) {
2167                         if (ifmgd->probe_send_count < max_tries) {
2168 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2169                                 wiphy_debug(local->hw.wiphy,
2170                                             "%s: No ack for nullfunc frame to"
2171                                             " AP %pM, try %d/%i\n",
2172                                             sdata->name, bssid,
2173                                             ifmgd->probe_send_count, max_tries);
2174 #endif
2175                                 ieee80211_mgd_probe_ap_send(sdata);
2176                         } else {
2177 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2178                                 wiphy_debug(local->hw.wiphy,
2179                                             "%s: No ack for nullfunc frame to"
2180                                             " AP %pM, disconnecting.\n",
2181                                             sdata->name, bssid);
2182 #endif
2183                                 ieee80211_sta_connection_lost(sdata, bssid,
2184                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2185                         }
2186                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2187                         run_again(ifmgd, ifmgd->probe_timeout);
2188                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2189 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2190                         wiphy_debug(local->hw.wiphy,
2191                                     "%s: Failed to send nullfunc to AP %pM"
2192                                     " after %dms, disconnecting.\n",
2193                                     sdata->name,
2194                                     bssid, probe_wait_ms);
2195 #endif
2196                         ieee80211_sta_connection_lost(sdata, bssid,
2197                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2198                 } else if (ifmgd->probe_send_count < max_tries) {
2199 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2200                         wiphy_debug(local->hw.wiphy,
2201                                     "%s: No probe response from AP %pM"
2202                                     " after %dms, try %d/%i\n",
2203                                     sdata->name,
2204                                     bssid, probe_wait_ms,
2205                                     ifmgd->probe_send_count, max_tries);
2206 #endif
2207                         ieee80211_mgd_probe_ap_send(sdata);
2208                 } else {
2209                         /*
2210                          * We actually lost the connection ... or did we?
2211                          * Let's make sure!
2212                          */
2213                         wiphy_debug(local->hw.wiphy,
2214                                     "%s: No probe response from AP %pM"
2215                                     " after %dms, disconnecting.\n",
2216                                     sdata->name,
2217                                     bssid, probe_wait_ms);
2218
2219                         ieee80211_sta_connection_lost(sdata, bssid,
2220                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2221                 }
2222         }
2223
2224         mutex_unlock(&ifmgd->mtx);
2225 }
2226
2227 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2228 {
2229         struct ieee80211_sub_if_data *sdata =
2230                 (struct ieee80211_sub_if_data *) data;
2231         struct ieee80211_local *local = sdata->local;
2232
2233         if (local->quiescing)
2234                 return;
2235
2236         ieee80211_queue_work(&sdata->local->hw,
2237                              &sdata->u.mgd.beacon_connection_loss_work);
2238 }
2239
2240 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2241 {
2242         struct ieee80211_sub_if_data *sdata =
2243                 (struct ieee80211_sub_if_data *) data;
2244         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2245         struct ieee80211_local *local = sdata->local;
2246
2247         if (local->quiescing)
2248                 return;
2249
2250         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2251 }
2252
2253 static void ieee80211_sta_monitor_work(struct work_struct *work)
2254 {
2255         struct ieee80211_sub_if_data *sdata =
2256                 container_of(work, struct ieee80211_sub_if_data,
2257                              u.mgd.monitor_work);
2258
2259         ieee80211_mgd_probe_ap(sdata, false);
2260 }
2261
2262 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2263 {
2264         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2265                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2266                                         IEEE80211_STA_CONNECTION_POLL);
2267
2268                 /* let's probe the connection once */
2269                 ieee80211_queue_work(&sdata->local->hw,
2270                            &sdata->u.mgd.monitor_work);
2271                 /* and do all the other regular work too */
2272                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2273         }
2274 }
2275
2276 #ifdef CONFIG_PM
2277 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2278 {
2279         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2280
2281         /*
2282          * we need to use atomic bitops for the running bits
2283          * only because both timers might fire at the same
2284          * time -- the code here is properly synchronised.
2285          */
2286
2287         cancel_work_sync(&ifmgd->request_smps_work);
2288
2289         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2290         if (del_timer_sync(&ifmgd->timer))
2291                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2292
2293         cancel_work_sync(&ifmgd->chswitch_work);
2294         if (del_timer_sync(&ifmgd->chswitch_timer))
2295                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2296
2297         cancel_work_sync(&ifmgd->monitor_work);
2298         /* these will just be re-established on connection */
2299         del_timer_sync(&ifmgd->conn_mon_timer);
2300         del_timer_sync(&ifmgd->bcn_mon_timer);
2301 }
2302
2303 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2304 {
2305         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2306
2307         if (!ifmgd->associated)
2308                 return;
2309
2310         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2311                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2312                 mutex_lock(&ifmgd->mtx);
2313                 if (ifmgd->associated) {
2314 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2315                         wiphy_debug(sdata->local->hw.wiphy,
2316                                     "%s: driver requested disconnect after resume.\n",
2317                                     sdata->name);
2318 #endif
2319                         ieee80211_sta_connection_lost(sdata,
2320                                 ifmgd->associated->bssid,
2321                                 WLAN_REASON_UNSPECIFIED);
2322                         mutex_unlock(&ifmgd->mtx);
2323                         return;
2324                 }
2325                 mutex_unlock(&ifmgd->mtx);
2326         }
2327
2328         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2329                 add_timer(&ifmgd->timer);
2330         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2331                 add_timer(&ifmgd->chswitch_timer);
2332         ieee80211_sta_reset_beacon_monitor(sdata);
2333         ieee80211_restart_sta_timer(sdata);
2334         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.monitor_work);
2335 }
2336 #endif
2337
2338 /* interface setup */
2339 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2340 {
2341         struct ieee80211_if_managed *ifmgd;
2342
2343         ifmgd = &sdata->u.mgd;
2344         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2345         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2346         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2347                   ieee80211_beacon_connection_loss_work);
2348         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2349         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2350                     (unsigned long) sdata);
2351         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2352                     (unsigned long) sdata);
2353         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2354                     (unsigned long) sdata);
2355         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2356                     (unsigned long) sdata);
2357
2358         ifmgd->flags = 0;
2359
2360         mutex_init(&ifmgd->mtx);
2361
2362         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2363                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2364         else
2365                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2366 }
2367
2368 /* scan finished notification */
2369 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2370 {
2371         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2372
2373         /* Restart STA timers */
2374         rcu_read_lock();
2375         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2376                 ieee80211_restart_sta_timer(sdata);
2377         rcu_read_unlock();
2378 }
2379
2380 int ieee80211_max_network_latency(struct notifier_block *nb,
2381                                   unsigned long data, void *dummy)
2382 {
2383         s32 latency_usec = (s32) data;
2384         struct ieee80211_local *local =
2385                 container_of(nb, struct ieee80211_local,
2386                              network_latency_notifier);
2387
2388         mutex_lock(&local->iflist_mtx);
2389         ieee80211_recalc_ps(local, latency_usec);
2390         mutex_unlock(&local->iflist_mtx);
2391
2392         return 0;
2393 }
2394
2395 /* config hooks */
2396 static enum work_done_result
2397 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2398                           struct sk_buff *skb)
2399 {
2400         struct ieee80211_local *local = wk->sdata->local;
2401
2402         if (!skb) {
2403                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2404                 goto destroy;
2405         }
2406
2407         if (wk->type == IEEE80211_WORK_AUTH) {
2408                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2409                 goto destroy;
2410         }
2411
2412         mutex_lock(&wk->sdata->u.mgd.mtx);
2413         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2414         mutex_unlock(&wk->sdata->u.mgd.mtx);
2415
2416         wk->type = IEEE80211_WORK_AUTH;
2417         wk->probe_auth.tries = 0;
2418         return WORK_DONE_REQUEUE;
2419  destroy:
2420         if (wk->probe_auth.synced)
2421                 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2422                                    IEEE80211_TX_SYNC_AUTH);
2423
2424         return WORK_DONE_DESTROY;
2425 }
2426
2427 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2428                        struct cfg80211_auth_request *req)
2429 {
2430         const u8 *ssid;
2431         struct ieee80211_work *wk;
2432         u16 auth_alg;
2433
2434         if (req->local_state_change)
2435                 return 0; /* no need to update mac80211 state */
2436
2437         switch (req->auth_type) {
2438         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2439                 auth_alg = WLAN_AUTH_OPEN;
2440                 break;
2441         case NL80211_AUTHTYPE_SHARED_KEY:
2442                 if (IS_ERR(sdata->local->wep_tx_tfm))
2443                         return -EOPNOTSUPP;
2444                 auth_alg = WLAN_AUTH_SHARED_KEY;
2445                 break;
2446         case NL80211_AUTHTYPE_FT:
2447                 auth_alg = WLAN_AUTH_FT;
2448                 break;
2449         case NL80211_AUTHTYPE_NETWORK_EAP:
2450                 auth_alg = WLAN_AUTH_LEAP;
2451                 break;
2452         default:
2453                 return -EOPNOTSUPP;
2454         }
2455
2456         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2457         if (!wk)
2458                 return -ENOMEM;
2459
2460         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2461
2462         if (req->ie && req->ie_len) {
2463                 memcpy(wk->ie, req->ie, req->ie_len);
2464                 wk->ie_len = req->ie_len;
2465         }
2466
2467         if (req->key && req->key_len) {
2468                 wk->probe_auth.key_len = req->key_len;
2469                 wk->probe_auth.key_idx = req->key_idx;
2470                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2471         }
2472
2473         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2474         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2475         wk->probe_auth.ssid_len = ssid[1];
2476
2477         wk->probe_auth.algorithm = auth_alg;
2478         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2479
2480         /* if we already have a probe, don't probe again */
2481         if (req->bss->proberesp_ies)
2482                 wk->type = IEEE80211_WORK_AUTH;
2483         else
2484                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2485         wk->chan = req->bss->channel;
2486         wk->chan_type = NL80211_CHAN_NO_HT;
2487         wk->sdata = sdata;
2488         wk->done = ieee80211_probe_auth_done;
2489
2490         ieee80211_add_work(wk);
2491         return 0;
2492 }
2493
2494 /* create and insert a dummy station entry */
2495 static int ieee80211_pre_assoc(struct ieee80211_sub_if_data *sdata,
2496                                 u8 *bssid) {
2497         struct sta_info *sta;
2498         int err;
2499
2500         sta = sta_info_alloc(sdata, bssid, GFP_KERNEL);
2501         if (!sta)
2502                 return -ENOMEM;
2503
2504         sta->dummy = true;
2505
2506         err = sta_info_insert(sta);
2507         sta = NULL;
2508         if (err) {
2509                 printk(KERN_DEBUG "%s: failed to insert Dummy STA entry for"
2510                        " the AP (error %d)\n", sdata->name, err);
2511                 return err;
2512         }
2513
2514         return 0;
2515 }
2516
2517 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2518                                                   struct sk_buff *skb)
2519 {
2520         struct ieee80211_local *local = wk->sdata->local;
2521         struct ieee80211_mgmt *mgmt;
2522         struct ieee80211_rx_status *rx_status;
2523         struct ieee802_11_elems elems;
2524         struct cfg80211_bss *cbss = wk->assoc.bss;
2525         u16 status;
2526
2527         if (!skb) {
2528                 sta_info_destroy_addr(wk->sdata, cbss->bssid);
2529                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2530                 goto destroy;
2531         }
2532
2533         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2534                 mutex_lock(&wk->sdata->u.mgd.mtx);
2535                 rx_status = (void *) skb->cb;
2536                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2537                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2538                                       &elems, true);
2539                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2540
2541                 wk->type = IEEE80211_WORK_ASSOC;
2542                 /* not really done yet */
2543                 return WORK_DONE_REQUEUE;
2544         }
2545
2546         mgmt = (void *)skb->data;
2547         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2548
2549         if (status == WLAN_STATUS_SUCCESS) {
2550                 if (wk->assoc.synced)
2551                         drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2552                                            IEEE80211_TX_SYNC_ASSOC);
2553
2554                 mutex_lock(&wk->sdata->u.mgd.mtx);
2555                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2556                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2557                         /* oops -- internal error -- send timeout for now */
2558                         sta_info_destroy_addr(wk->sdata, cbss->bssid);
2559                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2560                                                     wk->filter_ta);
2561                         return WORK_DONE_DESTROY;
2562                 }
2563
2564                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2565         } else {
2566                 /* assoc failed - destroy the dummy station entry */
2567                 sta_info_destroy_addr(wk->sdata, cbss->bssid);
2568         }
2569
2570         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2571  destroy:
2572         if (wk->assoc.synced)
2573                 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2574                                    IEEE80211_TX_SYNC_ASSOC);
2575
2576         return WORK_DONE_DESTROY;
2577 }
2578
2579 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2580                         struct cfg80211_assoc_request *req)
2581 {
2582         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2583         struct ieee80211_bss *bss = (void *)req->bss->priv;
2584         struct ieee80211_work *wk;
2585         const u8 *ssid;
2586         int i, err;
2587
2588         mutex_lock(&ifmgd->mtx);
2589         if (ifmgd->associated) {
2590                 if (!req->prev_bssid ||
2591                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2592                            ETH_ALEN)) {
2593                         /*
2594                          * We are already associated and the request was not a
2595                          * reassociation request from the current BSS, so
2596                          * reject it.
2597                          */
2598                         mutex_unlock(&ifmgd->mtx);
2599                         return -EALREADY;
2600                 }
2601
2602                 /* Trying to reassociate - clear previous association state */
2603                 ieee80211_set_disassoc(sdata, true, false);
2604         }
2605         mutex_unlock(&ifmgd->mtx);
2606
2607         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2608         if (!wk)
2609                 return -ENOMEM;
2610
2611         /*
2612          * create a dummy station info entry in order
2613          * to start accepting incoming EAPOL packets from the station
2614          */
2615         err = ieee80211_pre_assoc(sdata, req->bss->bssid);
2616         if (err) {
2617                 kfree(wk);
2618                 return err;
2619         }
2620
2621         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2622         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2623
2624         ifmgd->beacon_crc_valid = false;
2625
2626         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2627                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2628                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2629                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2630                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2631
2632
2633         if (req->ie && req->ie_len) {
2634                 memcpy(wk->ie, req->ie, req->ie_len);
2635                 wk->ie_len = req->ie_len;
2636         } else
2637                 wk->ie_len = 0;
2638
2639         wk->assoc.bss = req->bss;
2640
2641         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2642
2643         /* new association always uses requested smps mode */
2644         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2645                 if (ifmgd->powersave)
2646                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2647                 else
2648                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2649         } else
2650                 ifmgd->ap_smps = ifmgd->req_smps;
2651
2652         wk->assoc.smps = ifmgd->ap_smps;
2653         /*
2654          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2655          * We still associate in non-HT mode (11a/b/g) if any one of these
2656          * ciphers is configured as pairwise.
2657          * We can set this to true for non-11n hardware, that'll be checked
2658          * separately along with the peer capabilities.
2659          */
2660         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2661         wk->assoc.capability = req->bss->capability;
2662         wk->assoc.wmm_used = bss->wmm_used;
2663         wk->assoc.supp_rates = bss->supp_rates;
2664         wk->assoc.supp_rates_len = bss->supp_rates_len;
2665         wk->assoc.ht_information_ie =
2666                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2667
2668         if (bss->wmm_used && bss->uapsd_supported &&
2669             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2670                 wk->assoc.uapsd_used = true;
2671                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2672         } else {
2673                 wk->assoc.uapsd_used = false;
2674                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2675         }
2676
2677         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2678         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2679         wk->assoc.ssid_len = ssid[1];
2680
2681         if (req->prev_bssid)
2682                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2683
2684         wk->chan = req->bss->channel;
2685         wk->chan_type = NL80211_CHAN_NO_HT;
2686         wk->sdata = sdata;
2687         wk->done = ieee80211_assoc_done;
2688         if (!bss->dtim_period &&
2689             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2690                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2691         else
2692                 wk->type = IEEE80211_WORK_ASSOC;
2693
2694         if (req->use_mfp) {
2695                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2696                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2697         } else {
2698                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2699                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2700         }
2701
2702         if (req->crypto.control_port)
2703                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2704         else
2705                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2706
2707         sdata->control_port_protocol = req->crypto.control_port_ethertype;
2708         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2709
2710         ieee80211_add_work(wk);
2711         return 0;
2712 }
2713
2714 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2715                          struct cfg80211_deauth_request *req,
2716                          void *cookie)
2717 {
2718         struct ieee80211_local *local = sdata->local;
2719         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2720         struct ieee80211_work *wk;
2721         u8 bssid[ETH_ALEN];
2722         bool assoc_bss = false;
2723
2724         mutex_lock(&ifmgd->mtx);
2725
2726         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2727         if (ifmgd->associated == req->bss) {
2728                 ieee80211_set_disassoc(sdata, false, true);
2729                 mutex_unlock(&ifmgd->mtx);
2730                 assoc_bss = true;
2731         } else {
2732                 bool not_auth_yet = false;
2733
2734                 mutex_unlock(&ifmgd->mtx);
2735
2736                 mutex_lock(&local->mtx);
2737                 list_for_each_entry(wk, &local->work_list, list) {
2738                         if (wk->sdata != sdata)
2739                                 continue;
2740
2741                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2742                             wk->type != IEEE80211_WORK_AUTH &&
2743                             wk->type != IEEE80211_WORK_ASSOC &&
2744                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2745                                 continue;
2746
2747                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2748                                 continue;
2749
2750                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2751                         list_del_rcu(&wk->list);
2752                         free_work(wk);
2753                         break;
2754                 }
2755                 mutex_unlock(&local->mtx);
2756
2757                 /*
2758                  * If somebody requests authentication and we haven't
2759                  * sent out an auth frame yet there's no need to send
2760                  * out a deauth frame either. If the state was PROBE,
2761                  * then this is the case. If it's AUTH we have sent a
2762                  * frame, and if it's IDLE we have completed the auth
2763                  * process already.
2764                  */
2765                 if (not_auth_yet) {
2766                         __cfg80211_auth_canceled(sdata->dev, bssid);
2767                         return 0;
2768                 }
2769         }
2770
2771         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2772                sdata->name, bssid, req->reason_code);
2773
2774         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2775                                        req->reason_code, cookie,
2776                                        !req->local_state_change);
2777         if (assoc_bss)
2778                 sta_info_flush(sdata->local, sdata);
2779
2780         mutex_lock(&sdata->local->mtx);
2781         ieee80211_recalc_idle(sdata->local);
2782         mutex_unlock(&sdata->local->mtx);
2783
2784         return 0;
2785 }
2786
2787 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2788                            struct cfg80211_disassoc_request *req,
2789                            void *cookie)
2790 {
2791         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2792         u8 bssid[ETH_ALEN];
2793
2794         mutex_lock(&ifmgd->mtx);
2795
2796         /*
2797          * cfg80211 should catch this ... but it's racy since
2798          * we can receive a disassoc frame, process it, hand it
2799          * to cfg80211 while that's in a locked section already
2800          * trying to tell us that the user wants to disconnect.
2801          */
2802         if (ifmgd->associated != req->bss) {
2803                 mutex_unlock(&ifmgd->mtx);
2804                 return -ENOLINK;
2805         }
2806
2807         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2808                sdata->name, req->bss->bssid, req->reason_code);
2809
2810         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2811         ieee80211_set_disassoc(sdata, false, true);
2812
2813         mutex_unlock(&ifmgd->mtx);
2814
2815         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2816                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2817                         cookie, !req->local_state_change);
2818         sta_info_flush(sdata->local, sdata);
2819
2820         mutex_lock(&sdata->local->mtx);
2821         ieee80211_recalc_idle(sdata->local);
2822         mutex_unlock(&sdata->local->mtx);
2823
2824         return 0;
2825 }
2826
2827 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2828                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2829                                gfp_t gfp)
2830 {
2831         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2832
2833         trace_api_cqm_rssi_notify(sdata, rssi_event);
2834
2835         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2836 }
2837 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
2838
2839 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
2840 {
2841         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2842         return sdata->dev->operstate;
2843 }
2844 EXPORT_SYMBOL(ieee80211_get_operstate);