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->associated)
 641                 return false;
 642
 643         if (!mgd->associated->beacon_ies)
 644                 return false;
 645
 646         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 647                           IEEE80211_STA_CONNECTION_POLL))
 648                 return false;
 649
 650         rcu_read_lock();
 651         sta = sta_info_get(sdata, mgd->bssid);
 652         if (sta)
 653                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 654         rcu_read_unlock();
 655
 656         return authorized;
 657 }
 658
 659 /* need to hold RTNL or interface lock */
 660 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 661 {
 662         struct ieee80211_sub_if_data *sdata, *found = NULL;
 663         int count = 0;
 664         int timeout;
 665
 666         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 667                 local->ps_sdata = NULL;
 668                 return;
 669         }
 670
 671         if (!list_empty(&local->work_list)) {
 672                 local->ps_sdata = NULL;
 673                 goto change;
 674         }
 675
 676         list_for_each_entry(sdata, &local->interfaces, list) {
 677                 if (!ieee80211_sdata_running(sdata))
 678                         continue;
 679                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 680                         /* If an AP vif is found, then disable PS
 681                          * by setting the count to zero thereby setting
 682                          * ps_sdata to NULL.
 683                          */
 684                         count = 0;
 685                         break;
 686                 }
 687                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 688                         continue;
 689                 found = sdata;
 690                 count++;
 691         }
 692
 693         if (count == 1 && ieee80211_powersave_allowed(found)) {
 694                 struct ieee80211_conf *conf = &local->hw.conf;
 695                 s32 beaconint_us;
 696
 697                 if (latency < 0)
 698                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 699
 700                 beaconint_us = ieee80211_tu_to_usec(
 701                                         found->vif.bss_conf.beacon_int);
 702
 703                 timeout = local->dynamic_ps_forced_timeout;
 704                 if (timeout < 0) {
 705                         /*
 706                          * Go to full PSM if the user configures a very low
 707                          * latency requirement.
 708                          * The 2000 second value is there for compatibility
 709                          * until the PM_QOS_NETWORK_LATENCY is configured
 710                          * with real values.
 711                          */
 712                         if (latency > (1900 * USEC_PER_MSEC) &&
 713                             latency != (2000 * USEC_PER_SEC))
 714                                 timeout = 0;
 715                         else
 716                                 timeout = 100;
 717                 }
 718                 local->dynamic_ps_user_timeout = timeout;
 719                 if (!local->disable_dynamic_ps)
 720                         conf->dynamic_ps_timeout =
 721                                 local->dynamic_ps_user_timeout;
 722
 723                 if (beaconint_us > latency) {
 724                         local->ps_sdata = NULL;
 725                 } else {
 726                         struct ieee80211_bss *bss;
 727                         int maxslp = 1;
 728                         u8 dtimper;
 729
 730                         bss = (void *)found->u.mgd.associated->priv;
 731                         dtimper = bss->dtim_period;
 732
 733                         /* If the TIM IE is invalid, pretend the value is 1 */
 734                         if (!dtimper)
 735                                 dtimper = 1;
 736                         else if (dtimper > 1)
 737                                 maxslp = min_t(int, dtimper,
 738                                                     latency / beaconint_us);
 739
 740                         local->hw.conf.max_sleep_period = maxslp;
 741                         local->hw.conf.ps_dtim_period = dtimper;
 742                         local->ps_sdata = found;
 743                 }
 744         } else {
 745                 local->ps_sdata = NULL;
 746         }
 747
 748  change:
 749         ieee80211_change_ps(local);
 750 }
 751
 752 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 753 {
 754         struct ieee80211_local *local =
 755                 container_of(work, struct ieee80211_local,
 756                              dynamic_ps_disable_work);
 757
 758         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 759                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 760                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 761         }
 762
 763         ieee80211_wake_queues_by_reason(&local->hw,
 764                                         IEEE80211_QUEUE_STOP_REASON_PS);
 765 }
 766
 767 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 768 {
 769         struct ieee80211_local *local =
 770                 container_of(work, struct ieee80211_local,
 771                              dynamic_ps_enable_work);
 772         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 773         struct ieee80211_if_managed *ifmgd;
 774         unsigned long flags;
 775         int q;
 776
 777         /* can only happen when PS was just disabled anyway */
 778         if (!sdata)
 779                 return;
 780
 781         ifmgd = &sdata->u.mgd;
 782
 783         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 784                 return;
 785
 786         if (!local->disable_dynamic_ps &&
 787             local->hw.conf.dynamic_ps_timeout > 0) {
 788                 /* don't enter PS if TX frames are pending */
 789                 if (drv_tx_frames_pending(local)) {
 790                         mod_timer(&local->dynamic_ps_timer, jiffies +
 791                                   msecs_to_jiffies(
 792                                   local->hw.conf.dynamic_ps_timeout));
 793                         return;
 794                 }
 795
 796                 /*
 797                  * transmission can be stopped by others which leads to
 798                  * dynamic_ps_timer expiry. Postpone the ps timer if it
 799                  * is not the actual idle state.
 800                  */
 801                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 802                 for (q = 0; q < local->hw.queues; q++) {
 803                         if (local->queue_stop_reasons[q]) {
 804                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
 805                                                        flags);
 806                                 mod_timer(&local->dynamic_ps_timer, jiffies +
 807                                           msecs_to_jiffies(
 808                                           local->hw.conf.dynamic_ps_timeout));
 809                                 return;
 810                         }
 811                 }
 812                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 813         }
 814
 815         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 816             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) {
 817                 netif_tx_stop_all_queues(sdata->dev);
 818
 819                 if (drv_tx_frames_pending(local))
 820                         mod_timer(&local->dynamic_ps_timer, jiffies +
 821                                   msecs_to_jiffies(
 822                                   local->hw.conf.dynamic_ps_timeout));
 823                 else {
 824                         ieee80211_send_nullfunc(local, sdata, 1);
 825                         /* Flush to get the tx status of nullfunc frame */
 826                         drv_flush(local, false);
 827                 }
 828         }
 829
 830         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 831               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 832             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 833                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 834                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 835                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 836         }
 837
 838         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 839                 netif_tx_wake_all_queues(sdata->dev);
 840 }
 841
 842 void ieee80211_dynamic_ps_timer(unsigned long data)
 843 {
 844         struct ieee80211_local *local = (void *) data;
 845
 846         if (local->quiescing || local->suspended)
 847                 return;
 848
 849         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 850 }
 851
 852 /* MLME */
 853 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 854                                      struct ieee80211_sub_if_data *sdata,
 855                                      u8 *wmm_param, size_t wmm_param_len)
 856 {
 857         struct ieee80211_tx_queue_params params;
 858         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 859         size_t left;
 860         int count;
 861         u8 *pos, uapsd_queues = 0;
 862
 863         if (!local->ops->conf_tx)
 864                 return;
 865
 866         if (local->hw.queues < 4)
 867                 return;
 868
 869         if (!wmm_param)
 870                 return;
 871
 872         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 873                 return;
 874
 875         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 876                 uapsd_queues = local->uapsd_queues;
 877
 878         count = wmm_param[6] & 0x0f;
 879         if (count == ifmgd->wmm_last_param_set)
 880                 return;
 881         ifmgd->wmm_last_param_set = count;
 882
 883         pos = wmm_param + 8;
 884         left = wmm_param_len - 8;
 885
 886         memset(&params, 0, sizeof(params));
 887
 888         local->wmm_acm = 0;
 889         for (; left >= 4; left -= 4, pos += 4) {
 890                 int aci = (pos[0] >> 5) & 0x03;
 891                 int acm = (pos[0] >> 4) & 0x01;
 892                 bool uapsd = false;
 893                 int queue;
 894
 895                 switch (aci) {
 896                 case 1: /* AC_BK */
 897                         queue = 3;
 898                         if (acm)
 899                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 900                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 901                                 uapsd = true;
 902                         break;
 903                 case 2: /* AC_VI */
 904                         queue = 1;
 905                         if (acm)
 906                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 907                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 908                                 uapsd = true;
 909                         break;
 910                 case 3: /* AC_VO */
 911                         queue = 0;
 912                         if (acm)
 913                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 914                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 915                                 uapsd = true;
 916                         break;
 917                 case 0: /* AC_BE */
 918                 default:
 919                         queue = 2;
 920                         if (acm)
 921                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 922                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 923                                 uapsd = true;
 924                         break;
 925                 }
 926
 927                 params.aifs = pos[0] & 0x0f;
 928                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 929                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 930                 params.txop = get_unaligned_le16(pos + 2);
 931                 params.uapsd = uapsd;
 932
 933 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 934                 wiphy_debug(local->hw.wiphy,
 935                             "WMM queue=%d aci=%d acm=%d aifs=%d "
 936                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 937                             queue, aci, acm,
 938                             params.aifs, params.cw_min, params.cw_max,
 939                             params.txop, params.uapsd);
 940 #endif
 941                 sdata->tx_conf[queue] = params;
 942                 if (drv_conf_tx(local, sdata, queue, &params))
 943                         wiphy_debug(local->hw.wiphy,
 944                                     "failed to set TX queue parameters for queue %d\n",
 945                                     queue);
 946         }
 947
 948         /* enable WMM or activate new settings */
 949         sdata->vif.bss_conf.qos = true;
 950         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 951 }
 952
 953 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 954                                            u16 capab, bool erp_valid, u8 erp)
 955 {
 956         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 957         u32 changed = 0;
 958         bool use_protection;
 959         bool use_short_preamble;
 960         bool use_short_slot;
 961
 962         if (erp_valid) {
 963                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 964                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 965         } else {
 966                 use_protection = false;
 967                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 968         }
 969
 970         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 971         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 972                 use_short_slot = true;
 973
 974         if (use_protection != bss_conf->use_cts_prot) {
 975                 bss_conf->use_cts_prot = use_protection;
 976                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 977         }
 978
 979         if (use_short_preamble != bss_conf->use_short_preamble) {
 980                 bss_conf->use_short_preamble = use_short_preamble;
 981                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 982         }
 983
 984         if (use_short_slot != bss_conf->use_short_slot) {
 985                 bss_conf->use_short_slot = use_short_slot;
 986                 changed |= BSS_CHANGED_ERP_SLOT;
 987         }
 988
 989         return changed;
 990 }
 991
 992 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 993                                      struct cfg80211_bss *cbss,
 994                                      u32 bss_info_changed)
 995 {
 996         struct ieee80211_bss *bss = (void *)cbss->priv;
 997         struct ieee80211_local *local = sdata->local;
 998         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 999
1000         bss_info_changed |= BSS_CHANGED_ASSOC;
1001         /* set timing information */
1002         bss_conf->beacon_int = cbss->beacon_interval;
1003         bss_conf->timestamp = cbss->tsf;
1004
1005         bss_info_changed |= BSS_CHANGED_BEACON_INT;
1006         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1007                 cbss->capability, bss->has_erp_value, bss->erp_value);
1008
1009         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1010                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1011
1012         sdata->u.mgd.associated = cbss;
1013         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1014
1015         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1016
1017         /* just to be sure */
1018         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1019                                 IEEE80211_STA_BEACON_POLL);
1020
1021         ieee80211_led_assoc(local, 1);
1022
1023         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1024                 bss_conf->dtim_period = bss->dtim_period;
1025         else
1026                 bss_conf->dtim_period = 0;
1027
1028         bss_conf->assoc = 1;
1029         /*
1030          * For now just always ask the driver to update the basic rateset
1031          * when we have associated, we aren't checking whether it actually
1032          * changed or not.
1033          */
1034         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
1035
1036         /* And the BSSID changed - we're associated now */
1037         bss_info_changed |= BSS_CHANGED_BSSID;
1038
1039         /* Tell the driver to monitor connection quality (if supported) */
1040         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
1041             bss_conf->cqm_rssi_thold)
1042                 bss_info_changed |= BSS_CHANGED_CQM;
1043
1044         /* Enable ARP filtering */
1045         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1046                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1047                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1048         }
1049
1050         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1051
1052         mutex_lock(&local->iflist_mtx);
1053         ieee80211_recalc_ps(local, -1);
1054         ieee80211_recalc_smps(local);
1055         mutex_unlock(&local->iflist_mtx);
1056
1057         netif_tx_start_all_queues(sdata->dev);
1058         netif_carrier_on(sdata->dev);
1059 }
1060
1061 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1062                                    bool remove_sta, bool tx)
1063 {
1064         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1065         struct ieee80211_local *local = sdata->local;
1066         struct sta_info *sta;
1067         u32 changed = 0, config_changed = 0;
1068         u8 bssid[ETH_ALEN];
1069
1070         ASSERT_MGD_MTX(ifmgd);
1071
1072         if (WARN_ON(!ifmgd->associated))
1073                 return;
1074
1075         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1076
1077         ifmgd->associated = NULL;
1078         memset(ifmgd->bssid, 0, ETH_ALEN);
1079
1080         /*
1081          * we need to commit the associated = NULL change because the
1082          * scan code uses that to determine whether this iface should
1083          * go to/wake up from powersave or not -- and could otherwise
1084          * wake the queues erroneously.
1085          */
1086         smp_mb();
1087
1088         /*
1089          * Thus, we can only afterwards stop the queues -- to account
1090          * for the case where another CPU is finishing a scan at this
1091          * time -- we don't want the scan code to enable queues.
1092          */
1093
1094         netif_tx_stop_all_queues(sdata->dev);
1095         netif_carrier_off(sdata->dev);
1096
1097         mutex_lock(&local->sta_mtx);
1098         sta = sta_info_get(sdata, bssid);
1099         if (sta) {
1100                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1101                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1102         }
1103         mutex_unlock(&local->sta_mtx);
1104
1105         changed |= ieee80211_reset_erp_info(sdata);
1106
1107         ieee80211_led_assoc(local, 0);
1108         changed |= BSS_CHANGED_ASSOC;
1109         sdata->vif.bss_conf.assoc = false;
1110
1111         ieee80211_set_wmm_default(sdata);
1112
1113         /* channel(_type) changes are handled by ieee80211_hw_config */
1114         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1115
1116         /* on the next assoc, re-program HT parameters */
1117         sdata->ht_opmode_valid = false;
1118
1119         local->power_constr_level = 0;
1120
1121         del_timer_sync(&local->dynamic_ps_timer);
1122         cancel_work_sync(&local->dynamic_ps_enable_work);
1123
1124         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1125                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1126                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1127         }
1128         local->ps_sdata = NULL;
1129
1130         ieee80211_hw_config(local, config_changed);
1131
1132         /* Disable ARP filtering */
1133         if (sdata->vif.bss_conf.arp_filter_enabled) {
1134                 sdata->vif.bss_conf.arp_filter_enabled = false;
1135                 changed |= BSS_CHANGED_ARP_FILTER;
1136         }
1137
1138         /* The BSSID (not really interesting) and HT changed */
1139         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1140         ieee80211_bss_info_change_notify(sdata, changed);
1141
1142         /* remove AP and TDLS peers */
1143         if (remove_sta)
1144                 sta_info_flush(local, sdata);
1145
1146         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1147         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1148         del_timer_sync(&sdata->u.mgd.timer);
1149         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1150 }
1151
1152 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1153                              struct ieee80211_hdr *hdr)
1154 {
1155         /*
1156          * We can postpone the mgd.timer whenever receiving unicast frames
1157          * from AP because we know that the connection is working both ways
1158          * at that time. But multicast frames (and hence also beacons) must
1159          * be ignored here, because we need to trigger the timer during
1160          * data idle periods for sending the periodic probe request to the
1161          * AP we're connected to.
1162          */
1163         if (is_multicast_ether_addr(hdr->addr1))
1164                 return;
1165
1166         ieee80211_sta_reset_conn_monitor(sdata);
1167 }
1168
1169 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1170 {
1171         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1172
1173         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1174                               IEEE80211_STA_CONNECTION_POLL)))
1175             return;
1176
1177         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1178                           IEEE80211_STA_BEACON_POLL);
1179         mutex_lock(&sdata->local->iflist_mtx);
1180         ieee80211_recalc_ps(sdata->local, -1);
1181         mutex_unlock(&sdata->local->iflist_mtx);
1182
1183         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1184                 return;
1185
1186         /*
1187          * We've received a probe response, but are not sure whether
1188          * we have or will be receiving any beacons or data, so let's
1189          * schedule the timers again, just in case.
1190          */
1191         ieee80211_sta_reset_beacon_monitor(sdata);
1192
1193         mod_timer(&ifmgd->conn_mon_timer,
1194                   round_jiffies_up(jiffies +
1195                                    IEEE80211_CONNECTION_IDLE_TIME));
1196 }
1197
1198 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1199                              struct ieee80211_hdr *hdr, bool ack)
1200 {
1201         if (!ieee80211_is_data(hdr->frame_control))
1202             return;
1203
1204         if (ack)
1205                 ieee80211_sta_reset_conn_monitor(sdata);
1206
1207         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1208             sdata->u.mgd.probe_send_count > 0) {
1209                 if (ack)
1210                         sdata->u.mgd.probe_send_count = 0;
1211                 else
1212                         sdata->u.mgd.nullfunc_failed = true;
1213                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1214         }
1215 }
1216
1217 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1218 {
1219         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1220         const u8 *ssid;
1221         u8 *dst = ifmgd->associated->bssid;
1222         u8 unicast_limit = max(1, max_probe_tries - 3);
1223
1224         /*
1225          * Try sending broadcast probe requests for the last three
1226          * probe requests after the first ones failed since some
1227          * buggy APs only support broadcast probe requests.
1228          */
1229         if (ifmgd->probe_send_count >= unicast_limit)
1230                 dst = NULL;
1231
1232         /*
1233          * When the hardware reports an accurate Tx ACK status, it's
1234          * better to send a nullfunc frame instead of a probe request,
1235          * as it will kick us off the AP quickly if we aren't associated
1236          * anymore. The timeout will be reset if the frame is ACKed by
1237          * the AP.
1238          */
1239         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1240                 ifmgd->nullfunc_failed = false;
1241                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1242         } else {
1243                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1244                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0,
1245                                          (u32) -1, true, false);
1246         }
1247
1248         ifmgd->probe_send_count++;
1249         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1250         run_again(ifmgd, ifmgd->probe_timeout);
1251 }
1252
1253 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1254                                    bool beacon)
1255 {
1256         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1257         bool already = false;
1258
1259         if (!ieee80211_sdata_running(sdata))
1260                 return;
1261
1262         if (sdata->local->scanning)
1263                 return;
1264
1265         if (sdata->local->tmp_channel)
1266                 return;
1267
1268         mutex_lock(&ifmgd->mtx);
1269
1270         if (!ifmgd->associated)
1271                 goto out;
1272
1273 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1274         if (beacon && net_ratelimit())
1275                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1276                        "- sending probe request\n", sdata->name);
1277 #endif
1278
1279         /*
1280          * The driver/our work has already reported this event or the
1281          * connection monitoring has kicked in and we have already sent
1282          * a probe request. Or maybe the AP died and the driver keeps
1283          * reporting until we disassociate...
1284          *
1285          * In either case we have to ignore the current call to this
1286          * function (except for setting the correct probe reason bit)
1287          * because otherwise we would reset the timer every time and
1288          * never check whether we received a probe response!
1289          */
1290         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1291                             IEEE80211_STA_CONNECTION_POLL))
1292                 already = true;
1293
1294         if (beacon)
1295                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1296         else
1297                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1298
1299         if (already)
1300                 goto out;
1301
1302         mutex_lock(&sdata->local->iflist_mtx);
1303         ieee80211_recalc_ps(sdata->local, -1);
1304         mutex_unlock(&sdata->local->iflist_mtx);
1305
1306         ifmgd->probe_send_count = 0;
1307         ieee80211_mgd_probe_ap_send(sdata);
1308  out:
1309         mutex_unlock(&ifmgd->mtx);
1310 }
1311
1312 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1313                                           struct ieee80211_vif *vif)
1314 {
1315         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1316         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1317         struct sk_buff *skb;
1318         const u8 *ssid;
1319
1320         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1321                 return NULL;
1322
1323         ASSERT_MGD_MTX(ifmgd);
1324
1325         if (!ifmgd->associated)
1326                 return NULL;
1327
1328         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1329         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1330                                         (u32) -1, ssid + 2, ssid[1],
1331                                         NULL, 0, true);
1332
1333         return skb;
1334 }
1335 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1336
1337 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1338 {
1339         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1340         struct ieee80211_local *local = sdata->local;
1341         u8 bssid[ETH_ALEN];
1342
1343         mutex_lock(&ifmgd->mtx);
1344         if (!ifmgd->associated) {
1345                 mutex_unlock(&ifmgd->mtx);
1346                 return;
1347         }
1348
1349         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1350
1351         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1352                sdata->name, bssid);
1353
1354         ieee80211_set_disassoc(sdata, true, true);
1355         mutex_unlock(&ifmgd->mtx);
1356
1357         mutex_lock(&local->mtx);
1358         ieee80211_recalc_idle(local);
1359         mutex_unlock(&local->mtx);
1360         /*
1361          * must be outside lock due to cfg80211,
1362          * but that's not a problem.
1363          */
1364         ieee80211_send_deauth_disassoc(sdata, bssid,
1365                                        IEEE80211_STYPE_DEAUTH,
1366                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1367                                        NULL, true);
1368 }
1369
1370 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1371 {
1372         struct ieee80211_sub_if_data *sdata =
1373                 container_of(work, struct ieee80211_sub_if_data,
1374                              u.mgd.beacon_connection_loss_work);
1375
1376         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1377                 __ieee80211_connection_loss(sdata);
1378         else
1379                 ieee80211_mgd_probe_ap(sdata, true);
1380 }
1381
1382 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1383 {
1384         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1385         struct ieee80211_hw *hw = &sdata->local->hw;
1386
1387         trace_api_beacon_loss(sdata);
1388
1389         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1390         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1391 }
1392 EXPORT_SYMBOL(ieee80211_beacon_loss);
1393
1394 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1395 {
1396         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1397         struct ieee80211_hw *hw = &sdata->local->hw;
1398
1399         trace_api_connection_loss(sdata);
1400
1401         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1402         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1403 }
1404 EXPORT_SYMBOL(ieee80211_connection_loss);
1405
1406
1407 static enum rx_mgmt_action __must_check
1408 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1409                          struct ieee80211_mgmt *mgmt, size_t len)
1410 {
1411         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1412         const u8 *bssid = NULL;
1413         u16 reason_code;
1414
1415         if (len < 24 + 2)
1416                 return RX_MGMT_NONE;
1417
1418         ASSERT_MGD_MTX(ifmgd);
1419
1420         bssid = ifmgd->associated->bssid;
1421
1422         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1423
1424         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1425                         sdata->name, bssid, reason_code);
1426
1427         ieee80211_set_disassoc(sdata, true, false);
1428         mutex_lock(&sdata->local->mtx);
1429         ieee80211_recalc_idle(sdata->local);
1430         mutex_unlock(&sdata->local->mtx);
1431
1432         return RX_MGMT_CFG80211_DEAUTH;
1433 }
1434
1435
1436 static enum rx_mgmt_action __must_check
1437 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1438                            struct ieee80211_mgmt *mgmt, size_t len)
1439 {
1440         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1441         u16 reason_code;
1442
1443         if (len < 24 + 2)
1444                 return RX_MGMT_NONE;
1445
1446         ASSERT_MGD_MTX(ifmgd);
1447
1448         if (WARN_ON(!ifmgd->associated))
1449                 return RX_MGMT_NONE;
1450
1451         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1452                 return RX_MGMT_NONE;
1453
1454         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1455
1456         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1457                         sdata->name, mgmt->sa, reason_code);
1458
1459         ieee80211_set_disassoc(sdata, true, false);
1460         mutex_lock(&sdata->local->mtx);
1461         ieee80211_recalc_idle(sdata->local);
1462         mutex_unlock(&sdata->local->mtx);
1463         return RX_MGMT_CFG80211_DISASSOC;
1464 }
1465
1466
1467 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1468                                     struct ieee80211_mgmt *mgmt, size_t len)
1469 {
1470         struct ieee80211_sub_if_data *sdata = wk->sdata;
1471         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1472         struct ieee80211_local *local = sdata->local;
1473         struct ieee80211_supported_band *sband;
1474         struct sta_info *sta;
1475         struct cfg80211_bss *cbss = wk->assoc.bss;
1476         u8 *pos;
1477         u32 rates, basic_rates;
1478         u16 capab_info, aid;
1479         struct ieee802_11_elems elems;
1480         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1481         u32 changed = 0;
1482         int i, j, err;
1483         bool have_higher_than_11mbit = false;
1484         u16 ap_ht_cap_flags;
1485
1486         /* AssocResp and ReassocResp have identical structure */
1487
1488         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1489         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1490
1491         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1492                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1493                        "set\n", sdata->name, aid);
1494         aid &= ~(BIT(15) | BIT(14));
1495
1496         pos = mgmt->u.assoc_resp.variable;
1497         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1498
1499         if (!elems.supp_rates) {
1500                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1501                        sdata->name);
1502                 return false;
1503         }
1504
1505         ifmgd->aid = aid;
1506
1507         mutex_lock(&sdata->local->sta_mtx);
1508         /*
1509          * station info was already allocated and inserted before
1510          * the association and should be available to us
1511          */
1512         sta = sta_info_get_rx(sdata, cbss->bssid);
1513         if (WARN_ON(!sta)) {
1514                 mutex_unlock(&sdata->local->sta_mtx);
1515                 return false;
1516         }
1517
1518         set_sta_flag(sta, WLAN_STA_AUTH);
1519         set_sta_flag(sta, WLAN_STA_ASSOC);
1520         set_sta_flag(sta, WLAN_STA_ASSOC_AP);
1521         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1522                 set_sta_flag(sta, WLAN_STA_AUTHORIZED);
1523
1524         rates = 0;
1525         basic_rates = 0;
1526         sband = local->hw.wiphy->bands[wk->chan->band];
1527
1528         for (i = 0; i < elems.supp_rates_len; i++) {
1529                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1530                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1531
1532                 if (rate > 110)
1533                         have_higher_than_11mbit = true;
1534
1535                 for (j = 0; j < sband->n_bitrates; j++) {
1536                         if (sband->bitrates[j].bitrate == rate) {
1537                                 rates |= BIT(j);
1538                                 if (is_basic)
1539                                         basic_rates |= BIT(j);
1540                                 break;
1541                         }
1542                 }
1543         }
1544
1545         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1546                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1547                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1548
1549                 if (rate > 110)
1550                         have_higher_than_11mbit = true;
1551
1552                 for (j = 0; j < sband->n_bitrates; j++) {
1553                         if (sband->bitrates[j].bitrate == rate) {
1554                                 rates |= BIT(j);
1555                                 if (is_basic)
1556                                         basic_rates |= BIT(j);
1557                                 break;
1558                         }
1559                 }
1560         }
1561
1562         sta->sta.supp_rates[wk->chan->band] = rates;
1563         sdata->vif.bss_conf.basic_rates = basic_rates;
1564
1565         /* cf. IEEE 802.11 9.2.12 */
1566         if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1567             have_higher_than_11mbit)
1568                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1569         else
1570                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1571
1572         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1573                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1574                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1575
1576         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1577
1578         rate_control_rate_init(sta);
1579
1580         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1581                 set_sta_flag(sta, WLAN_STA_MFP);
1582
1583         if (elems.wmm_param)
1584                 set_sta_flag(sta, WLAN_STA_WME);
1585
1586         /* sta_info_reinsert will also unlock the mutex lock */
1587         err = sta_info_reinsert(sta);
1588         sta = NULL;
1589         if (err) {
1590                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1591                        " the AP (error %d)\n", sdata->name, err);
1592                 return false;
1593         }
1594
1595         /*
1596          * Always handle WMM once after association regardless
1597          * of the first value the AP uses. Setting -1 here has
1598          * that effect because the AP values is an unsigned
1599          * 4-bit value.
1600          */
1601         ifmgd->wmm_last_param_set = -1;
1602
1603         if (elems.wmm_param)
1604                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1605                                          elems.wmm_param_len);
1606         else
1607                 ieee80211_set_wmm_default(sdata);
1608
1609         local->oper_channel = wk->chan;
1610
1611         if (elems.ht_info_elem && elems.wmm_param &&
1612             (sdata->local->hw.queues >= 4) &&
1613             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1614                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1615                                                cbss->bssid, ap_ht_cap_flags,
1616                                                false);
1617
1618         /* set AID and assoc capability,
1619          * ieee80211_set_associated() will tell the driver */
1620         bss_conf->aid = aid;
1621         bss_conf->assoc_capability = capab_info;
1622         ieee80211_set_associated(sdata, cbss, changed);
1623
1624         /*
1625          * If we're using 4-addr mode, let the AP know that we're
1626          * doing so, so that it can create the STA VLAN on its side
1627          */
1628         if (ifmgd->use_4addr)
1629                 ieee80211_send_4addr_nullfunc(local, sdata);
1630
1631         /*
1632          * Start timer to probe the connection to the AP now.
1633          * Also start the timer that will detect beacon loss.
1634          */
1635         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1636         ieee80211_sta_reset_beacon_monitor(sdata);
1637
1638         return true;
1639 }
1640
1641
1642 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1643                                   struct ieee80211_mgmt *mgmt,
1644                                   size_t len,
1645                                   struct ieee80211_rx_status *rx_status,
1646                                   struct ieee802_11_elems *elems,
1647                                   bool beacon)
1648 {
1649         struct ieee80211_local *local = sdata->local;
1650         int freq;
1651         struct ieee80211_bss *bss;
1652         struct ieee80211_channel *channel;
1653         bool need_ps = false;
1654
1655         if (sdata->u.mgd.associated) {
1656                 bss = (void *)sdata->u.mgd.associated->priv;
1657                 /* not previously set so we may need to recalc */
1658                 need_ps = !bss->dtim_period;
1659         }
1660
1661         if (elems->ds_params && elems->ds_params_len == 1)
1662                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1663                                                       rx_status->band);
1664         else
1665                 freq = rx_status->freq;
1666
1667         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1668
1669         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1670                 return;
1671
1672         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1673                                         channel, beacon);
1674         if (bss)
1675                 ieee80211_rx_bss_put(local, bss);
1676
1677         if (!sdata->u.mgd.associated)
1678                 return;
1679
1680         if (need_ps) {
1681                 mutex_lock(&local->iflist_mtx);
1682                 ieee80211_recalc_ps(local, -1);
1683                 mutex_unlock(&local->iflist_mtx);
1684         }
1685
1686         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1687             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1688                                                         ETH_ALEN) == 0)) {
1689                 struct ieee80211_channel_sw_ie *sw_elem =
1690                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1691                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1692                                                  bss, rx_status->mactime);
1693         }
1694 }
1695
1696
1697 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1698                                          struct sk_buff *skb)
1699 {
1700         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1701         struct ieee80211_if_managed *ifmgd;
1702         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1703         size_t baselen, len = skb->len;
1704         struct ieee802_11_elems elems;
1705
1706         ifmgd = &sdata->u.mgd;
1707
1708         ASSERT_MGD_MTX(ifmgd);
1709
1710         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1711                 return; /* ignore ProbeResp to foreign address */
1712
1713         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1714         if (baselen > len)
1715                 return;
1716
1717         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1718                                 &elems);
1719
1720         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1721
1722         if (ifmgd->associated &&
1723             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1724                 ieee80211_reset_ap_probe(sdata);
1725 }
1726
1727 /*
1728  * This is the canonical list of information elements we care about,
1729  * the filter code also gives us all changes to the Microsoft OUI
1730  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1731  *
1732  * We implement beacon filtering in software since that means we can
1733  * avoid processing the frame here and in cfg80211, and userspace
1734  * will not be able to tell whether the hardware supports it or not.
1735  *
1736  * XXX: This list needs to be dynamic -- userspace needs to be able to
1737  *      add items it requires. It also needs to be able to tell us to
1738  *      look out for other vendor IEs.
1739  */
1740 static const u64 care_about_ies =
1741         (1ULL << WLAN_EID_COUNTRY) |
1742         (1ULL << WLAN_EID_ERP_INFO) |
1743         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1744         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1745         (1ULL << WLAN_EID_HT_CAPABILITY) |
1746         (1ULL << WLAN_EID_HT_INFORMATION);
1747
1748 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1749                                      struct ieee80211_mgmt *mgmt,
1750                                      size_t len,
1751                                      struct ieee80211_rx_status *rx_status)
1752 {
1753         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1754         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1755         size_t baselen;
1756         struct ieee802_11_elems elems;
1757         struct ieee80211_local *local = sdata->local;
1758         u32 changed = 0;
1759         bool erp_valid, directed_tim = false;
1760         u8 erp_value = 0;
1761         u32 ncrc;
1762         u8 *bssid;
1763
1764         ASSERT_MGD_MTX(ifmgd);
1765
1766         /* Process beacon from the current BSS */
1767         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1768         if (baselen > len)
1769                 return;
1770
1771         if (rx_status->freq != local->hw.conf.channel->center_freq)
1772                 return;
1773
1774         /*
1775          * We might have received a number of frames, among them a
1776          * disassoc frame and a beacon...
1777          */
1778         if (!ifmgd->associated)
1779                 return;
1780
1781         bssid = ifmgd->associated->bssid;
1782
1783         /*
1784          * And in theory even frames from a different AP we were just
1785          * associated to a split-second ago!
1786          */
1787         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1788                 return;
1789
1790         /* Track average RSSI from the Beacon frames of the current AP */
1791         ifmgd->last_beacon_signal = rx_status->signal;
1792         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1793                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1794                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1795                 ifmgd->last_cqm_event_signal = 0;
1796                 ifmgd->count_beacon_signal = 1;
1797                 ifmgd->last_ave_beacon_signal = 0;
1798         } else {
1799                 ifmgd->ave_beacon_signal =
1800                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1801                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1802                          ifmgd->ave_beacon_signal) / 16;
1803                 ifmgd->count_beacon_signal++;
1804         }
1805
1806         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
1807             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
1808                 int sig = ifmgd->ave_beacon_signal;
1809                 int last_sig = ifmgd->last_ave_beacon_signal;
1810
1811                 /*
1812                  * if signal crosses either of the boundaries, invoke callback
1813                  * with appropriate parameters
1814                  */
1815                 if (sig > ifmgd->rssi_max_thold &&
1816                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
1817                         ifmgd->last_ave_beacon_signal = sig;
1818                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
1819                 } else if (sig < ifmgd->rssi_min_thold &&
1820                            (last_sig >= ifmgd->rssi_max_thold ||
1821                            last_sig == 0)) {
1822                         ifmgd->last_ave_beacon_signal = sig;
1823                         drv_rssi_callback(local, RSSI_EVENT_LOW);
1824                 }
1825         }
1826
1827         if (bss_conf->cqm_rssi_thold &&
1828             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1829             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1830                 int sig = ifmgd->ave_beacon_signal / 16;
1831                 int last_event = ifmgd->last_cqm_event_signal;
1832                 int thold = bss_conf->cqm_rssi_thold;
1833                 int hyst = bss_conf->cqm_rssi_hyst;
1834                 if (sig < thold &&
1835                     (last_event == 0 || sig < last_event - hyst)) {
1836                         ifmgd->last_cqm_event_signal = sig;
1837                         ieee80211_cqm_rssi_notify(
1838                                 &sdata->vif,
1839                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1840                                 GFP_KERNEL);
1841                 } else if (sig > thold &&
1842                            (last_event == 0 || sig > last_event + hyst)) {
1843                         ifmgd->last_cqm_event_signal = sig;
1844                         ieee80211_cqm_rssi_notify(
1845                                 &sdata->vif,
1846                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1847                                 GFP_KERNEL);
1848                 }
1849         }
1850
1851         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1852 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1853                 if (net_ratelimit()) {
1854                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1855                                "to a received beacon\n", sdata->name);
1856                 }
1857 #endif
1858                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1859                 mutex_lock(&local->iflist_mtx);
1860                 ieee80211_recalc_ps(local, -1);
1861                 mutex_unlock(&local->iflist_mtx);
1862         }
1863
1864         /*
1865          * Push the beacon loss detection into the future since
1866          * we are processing a beacon from the AP just now.
1867          */
1868         ieee80211_sta_reset_beacon_monitor(sdata);
1869
1870         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1871         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1872                                           len - baselen, &elems,
1873                                           care_about_ies, ncrc);
1874
1875         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1876                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1877                                                    ifmgd->aid);
1878
1879         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1880                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1881                                       true);
1882
1883                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1884                                          elems.wmm_param_len);
1885         }
1886
1887         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1888                 if (directed_tim) {
1889                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1890                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1891                                 ieee80211_hw_config(local,
1892                                                     IEEE80211_CONF_CHANGE_PS);
1893                                 ieee80211_send_nullfunc(local, sdata, 0);
1894                         } else {
1895                                 local->pspolling = true;
1896
1897                                 /*
1898                                  * Here is assumed that the driver will be
1899                                  * able to send ps-poll frame and receive a
1900                                  * response even though power save mode is
1901                                  * enabled, but some drivers might require
1902                                  * to disable power save here. This needs
1903                                  * to be investigated.
1904                                  */
1905                                 ieee80211_send_pspoll(local, sdata);
1906                         }
1907                 }
1908         }
1909
1910         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1911                 return;
1912         ifmgd->beacon_crc = ncrc;
1913         ifmgd->beacon_crc_valid = true;
1914
1915         if (elems.erp_info && elems.erp_info_len >= 1) {
1916                 erp_valid = true;
1917                 erp_value = elems.erp_info[0];
1918         } else {
1919                 erp_valid = false;
1920         }
1921         changed |= ieee80211_handle_bss_capability(sdata,
1922                         le16_to_cpu(mgmt->u.beacon.capab_info),
1923                         erp_valid, erp_value);
1924
1925
1926         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1927             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1928                 struct sta_info *sta;
1929                 struct ieee80211_supported_band *sband;
1930                 u16 ap_ht_cap_flags;
1931
1932                 rcu_read_lock();
1933
1934                 sta = sta_info_get(sdata, bssid);
1935                 if (WARN_ON(!sta)) {
1936                         rcu_read_unlock();
1937                         return;
1938                 }
1939
1940                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1941
1942                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1943                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1944
1945                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1946
1947                 rcu_read_unlock();
1948
1949                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1950                                                bssid, ap_ht_cap_flags, true);
1951         }
1952
1953         /* Note: country IE parsing is done for us by cfg80211 */
1954         if (elems.country_elem) {
1955                 /* TODO: IBSS also needs this */
1956                 if (elems.pwr_constr_elem)
1957                         ieee80211_handle_pwr_constr(sdata,
1958                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1959                                 elems.pwr_constr_elem,
1960                                 elems.pwr_constr_elem_len);
1961         }
1962
1963         ieee80211_bss_info_change_notify(sdata, changed);
1964 }
1965
1966 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1967                                   struct sk_buff *skb)
1968 {
1969         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1970         struct ieee80211_rx_status *rx_status;
1971         struct ieee80211_mgmt *mgmt;
1972         enum rx_mgmt_action rma = RX_MGMT_NONE;
1973         u16 fc;
1974
1975         rx_status = (struct ieee80211_rx_status *) skb->cb;
1976         mgmt = (struct ieee80211_mgmt *) skb->data;
1977         fc = le16_to_cpu(mgmt->frame_control);
1978
1979         mutex_lock(&ifmgd->mtx);
1980
1981         if (ifmgd->associated &&
1982             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1983                 switch (fc & IEEE80211_FCTL_STYPE) {
1984                 case IEEE80211_STYPE_BEACON:
1985                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1986                                                  rx_status);
1987                         break;
1988                 case IEEE80211_STYPE_PROBE_RESP:
1989                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1990                         break;
1991                 case IEEE80211_STYPE_DEAUTH:
1992                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1993                         break;
1994                 case IEEE80211_STYPE_DISASSOC:
1995                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1996                         break;
1997                 case IEEE80211_STYPE_ACTION:
1998                         switch (mgmt->u.action.category) {
1999                         case WLAN_CATEGORY_SPECTRUM_MGMT:
2000                                 ieee80211_sta_process_chanswitch(sdata,
2001                                                 &mgmt->u.action.u.chan_switch.sw_elem,
2002                                                 (void *)ifmgd->associated->priv,
2003                                                 rx_status->mactime);
2004                                 break;
2005                         }
2006                 }
2007                 mutex_unlock(&ifmgd->mtx);
2008
2009                 switch (rma) {
2010                 case RX_MGMT_NONE:
2011                         /* no action */
2012                         break;
2013                 case RX_MGMT_CFG80211_DEAUTH:
2014                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2015                         break;
2016                 case RX_MGMT_CFG80211_DISASSOC:
2017                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2018                         break;
2019                 default:
2020                         WARN(1, "unexpected: %d", rma);
2021                 }
2022                 return;
2023         }
2024
2025         mutex_unlock(&ifmgd->mtx);
2026
2027         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
2028             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
2029                 struct ieee80211_local *local = sdata->local;
2030                 struct ieee80211_work *wk;
2031
2032                 mutex_lock(&local->mtx);
2033                 list_for_each_entry(wk, &local->work_list, list) {
2034                         if (wk->sdata != sdata)
2035                                 continue;
2036
2037                         if (wk->type != IEEE80211_WORK_ASSOC &&
2038                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2039                                 continue;
2040
2041                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
2042                                 continue;
2043                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
2044                                 continue;
2045
2046                         /*
2047                          * Printing the message only here means we can't
2048                          * spuriously print it, but it also means that it
2049                          * won't be printed when the frame comes in before
2050                          * we even tried to associate or in similar cases.
2051                          *
2052                          * Ultimately, I suspect cfg80211 should print the
2053                          * messages instead.
2054                          */
2055                         printk(KERN_DEBUG
2056                                "%s: deauthenticated from %pM (Reason: %u)\n",
2057                                sdata->name, mgmt->bssid,
2058                                le16_to_cpu(mgmt->u.deauth.reason_code));
2059
2060                         list_del_rcu(&wk->list);
2061                         free_work(wk);
2062                         break;
2063                 }
2064                 mutex_unlock(&local->mtx);
2065
2066                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2067         }
2068 }
2069
2070 static void ieee80211_sta_timer(unsigned long data)
2071 {
2072         struct ieee80211_sub_if_data *sdata =
2073                 (struct ieee80211_sub_if_data *) data;
2074         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2075         struct ieee80211_local *local = sdata->local;
2076
2077         if (local->quiescing) {
2078                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2079                 return;
2080         }
2081
2082         ieee80211_queue_work(&local->hw, &sdata->work);
2083 }
2084
2085 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2086                                           u8 *bssid, u8 reason)
2087 {
2088         struct ieee80211_local *local = sdata->local;
2089         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2090
2091         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2092                           IEEE80211_STA_BEACON_POLL);
2093
2094         ieee80211_set_disassoc(sdata, true, true);
2095         mutex_unlock(&ifmgd->mtx);
2096         mutex_lock(&local->mtx);
2097         ieee80211_recalc_idle(local);
2098         mutex_unlock(&local->mtx);
2099         /*
2100          * must be outside lock due to cfg80211,
2101          * but that's not a problem.
2102          */
2103         ieee80211_send_deauth_disassoc(sdata, bssid,
2104                         IEEE80211_STYPE_DEAUTH, reason,
2105                         NULL, true);
2106         mutex_lock(&ifmgd->mtx);
2107 }
2108
2109 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2110 {
2111         struct ieee80211_local *local = sdata->local;
2112         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2113
2114         /* then process the rest of the work */
2115         mutex_lock(&ifmgd->mtx);
2116
2117         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2118                             IEEE80211_STA_CONNECTION_POLL) &&
2119             ifmgd->associated) {
2120                 u8 bssid[ETH_ALEN];
2121                 int max_tries;
2122
2123                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2124
2125                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2126                         max_tries = max_nullfunc_tries;
2127                 else
2128                         max_tries = max_probe_tries;
2129
2130                 /* ACK received for nullfunc probing frame */
2131                 if (!ifmgd->probe_send_count)
2132                         ieee80211_reset_ap_probe(sdata);
2133                 else if (ifmgd->nullfunc_failed) {
2134                         if (ifmgd->probe_send_count < max_tries) {
2135 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2136                                 wiphy_debug(local->hw.wiphy,
2137                                             "%s: No ack for nullfunc frame to"
2138                                             " AP %pM, try %d/%i\n",
2139                                             sdata->name, bssid,
2140                                             ifmgd->probe_send_count, max_tries);
2141 #endif
2142                                 ieee80211_mgd_probe_ap_send(sdata);
2143                         } else {
2144 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2145                                 wiphy_debug(local->hw.wiphy,
2146                                             "%s: No ack for nullfunc frame to"
2147                                             " AP %pM, disconnecting.\n",
2148                                             sdata->name, bssid);
2149 #endif
2150                                 ieee80211_sta_connection_lost(sdata, bssid,
2151                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2152                         }
2153                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2154                         run_again(ifmgd, ifmgd->probe_timeout);
2155                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2156 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2157                         wiphy_debug(local->hw.wiphy,
2158                                     "%s: Failed to send nullfunc to AP %pM"
2159                                     " after %dms, disconnecting.\n",
2160                                     sdata->name,
2161                                     bssid, probe_wait_ms);
2162 #endif
2163                         ieee80211_sta_connection_lost(sdata, bssid,
2164                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2165                 } else if (ifmgd->probe_send_count < max_tries) {
2166 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2167                         wiphy_debug(local->hw.wiphy,
2168                                     "%s: No probe response from AP %pM"
2169                                     " after %dms, try %d/%i\n",
2170                                     sdata->name,
2171                                     bssid, probe_wait_ms,
2172                                     ifmgd->probe_send_count, max_tries);
2173 #endif
2174                         ieee80211_mgd_probe_ap_send(sdata);
2175                 } else {
2176                         /*
2177                          * We actually lost the connection ... or did we?
2178                          * Let's make sure!
2179                          */
2180                         wiphy_debug(local->hw.wiphy,
2181                                     "%s: No probe response from AP %pM"
2182                                     " after %dms, disconnecting.\n",
2183                                     sdata->name,
2184                                     bssid, probe_wait_ms);
2185
2186                         ieee80211_sta_connection_lost(sdata, bssid,
2187                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2188                 }
2189         }
2190
2191         mutex_unlock(&ifmgd->mtx);
2192 }
2193
2194 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2195 {
2196         struct ieee80211_sub_if_data *sdata =
2197                 (struct ieee80211_sub_if_data *) data;
2198         struct ieee80211_local *local = sdata->local;
2199
2200         if (local->quiescing)
2201                 return;
2202
2203         ieee80211_queue_work(&sdata->local->hw,
2204                              &sdata->u.mgd.beacon_connection_loss_work);
2205 }
2206
2207 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2208 {
2209         struct ieee80211_sub_if_data *sdata =
2210                 (struct ieee80211_sub_if_data *) data;
2211         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2212         struct ieee80211_local *local = sdata->local;
2213
2214         if (local->quiescing)
2215                 return;
2216
2217         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2218 }
2219
2220 static void ieee80211_sta_monitor_work(struct work_struct *work)
2221 {
2222         struct ieee80211_sub_if_data *sdata =
2223                 container_of(work, struct ieee80211_sub_if_data,
2224                              u.mgd.monitor_work);
2225
2226         ieee80211_mgd_probe_ap(sdata, false);
2227 }
2228
2229 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2230 {
2231         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2232                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2233                                         IEEE80211_STA_CONNECTION_POLL);
2234
2235                 /* let's probe the connection once */
2236                 ieee80211_queue_work(&sdata->local->hw,
2237                            &sdata->u.mgd.monitor_work);
2238                 /* and do all the other regular work too */
2239                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2240         }
2241 }
2242
2243 #ifdef CONFIG_PM
2244 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2245 {
2246         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2247
2248         /*
2249          * we need to use atomic bitops for the running bits
2250          * only because both timers might fire at the same
2251          * time -- the code here is properly synchronised.
2252          */
2253
2254         cancel_work_sync(&ifmgd->request_smps_work);
2255
2256         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2257         if (del_timer_sync(&ifmgd->timer))
2258                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2259
2260         cancel_work_sync(&ifmgd->chswitch_work);
2261         if (del_timer_sync(&ifmgd->chswitch_timer))
2262                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2263
2264         cancel_work_sync(&ifmgd->monitor_work);
2265         /* these will just be re-established on connection */
2266         del_timer_sync(&ifmgd->conn_mon_timer);
2267         del_timer_sync(&ifmgd->bcn_mon_timer);
2268 }
2269
2270 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2271 {
2272         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2273
2274         if (!ifmgd->associated)
2275                 return;
2276
2277         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2278                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2279                 mutex_lock(&ifmgd->mtx);
2280                 if (ifmgd->associated) {
2281 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2282                         wiphy_debug(sdata->local->hw.wiphy,
2283                                     "%s: driver requested disconnect after resume.\n",
2284                                     sdata->name);
2285 #endif
2286                         ieee80211_sta_connection_lost(sdata,
2287                                 ifmgd->associated->bssid,
2288                                 WLAN_REASON_UNSPECIFIED);
2289                         mutex_unlock(&ifmgd->mtx);
2290                         return;
2291                 }
2292                 mutex_unlock(&ifmgd->mtx);
2293         }
2294
2295         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2296                 add_timer(&ifmgd->timer);
2297         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2298                 add_timer(&ifmgd->chswitch_timer);
2299         ieee80211_sta_reset_beacon_monitor(sdata);
2300         ieee80211_restart_sta_timer(sdata);
2301         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.monitor_work);
2302 }
2303 #endif
2304
2305 /* interface setup */
2306 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2307 {
2308         struct ieee80211_if_managed *ifmgd;
2309
2310         ifmgd = &sdata->u.mgd;
2311         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2312         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2313         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2314                   ieee80211_beacon_connection_loss_work);
2315         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2316         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2317                     (unsigned long) sdata);
2318         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2319                     (unsigned long) sdata);
2320         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2321                     (unsigned long) sdata);
2322         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2323                     (unsigned long) sdata);
2324
2325         ifmgd->flags = 0;
2326
2327         mutex_init(&ifmgd->mtx);
2328
2329         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2330                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2331         else
2332                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2333 }
2334
2335 /* scan finished notification */
2336 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2337 {
2338         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2339
2340         /* Restart STA timers */
2341         rcu_read_lock();
2342         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2343                 ieee80211_restart_sta_timer(sdata);
2344         rcu_read_unlock();
2345 }
2346
2347 int ieee80211_max_network_latency(struct notifier_block *nb,
2348                                   unsigned long data, void *dummy)
2349 {
2350         s32 latency_usec = (s32) data;
2351         struct ieee80211_local *local =
2352                 container_of(nb, struct ieee80211_local,
2353                              network_latency_notifier);
2354
2355         mutex_lock(&local->iflist_mtx);
2356         ieee80211_recalc_ps(local, latency_usec);
2357         mutex_unlock(&local->iflist_mtx);
2358
2359         return 0;
2360 }
2361
2362 /* config hooks */
2363 static enum work_done_result
2364 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2365                           struct sk_buff *skb)
2366 {
2367         struct ieee80211_local *local = wk->sdata->local;
2368
2369         if (!skb) {
2370                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2371                 goto destroy;
2372         }
2373
2374         if (wk->type == IEEE80211_WORK_AUTH) {
2375                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2376                 goto destroy;
2377         }
2378
2379         mutex_lock(&wk->sdata->u.mgd.mtx);
2380         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2381         mutex_unlock(&wk->sdata->u.mgd.mtx);
2382
2383         wk->type = IEEE80211_WORK_AUTH;
2384         wk->probe_auth.tries = 0;
2385         return WORK_DONE_REQUEUE;
2386  destroy:
2387         if (wk->probe_auth.synced)
2388                 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2389                                    IEEE80211_TX_SYNC_AUTH);
2390
2391         return WORK_DONE_DESTROY;
2392 }
2393
2394 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2395                        struct cfg80211_auth_request *req)
2396 {
2397         const u8 *ssid;
2398         struct ieee80211_work *wk;
2399         u16 auth_alg;
2400
2401         if (req->local_state_change)
2402                 return 0; /* no need to update mac80211 state */
2403
2404         switch (req->auth_type) {
2405         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2406                 auth_alg = WLAN_AUTH_OPEN;
2407                 break;
2408         case NL80211_AUTHTYPE_SHARED_KEY:
2409                 if (IS_ERR(sdata->local->wep_tx_tfm))
2410                         return -EOPNOTSUPP;
2411                 auth_alg = WLAN_AUTH_SHARED_KEY;
2412                 break;
2413         case NL80211_AUTHTYPE_FT:
2414                 auth_alg = WLAN_AUTH_FT;
2415                 break;
2416         case NL80211_AUTHTYPE_NETWORK_EAP:
2417                 auth_alg = WLAN_AUTH_LEAP;
2418                 break;
2419         default:
2420                 return -EOPNOTSUPP;
2421         }
2422
2423         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2424         if (!wk)
2425                 return -ENOMEM;
2426
2427         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2428
2429         if (req->ie && req->ie_len) {
2430                 memcpy(wk->ie, req->ie, req->ie_len);
2431                 wk->ie_len = req->ie_len;
2432         }
2433
2434         if (req->key && req->key_len) {
2435                 wk->probe_auth.key_len = req->key_len;
2436                 wk->probe_auth.key_idx = req->key_idx;
2437                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2438         }
2439
2440         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2441         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2442         wk->probe_auth.ssid_len = ssid[1];
2443
2444         wk->probe_auth.algorithm = auth_alg;
2445         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2446
2447         /* if we already have a probe, don't probe again */
2448         if (req->bss->proberesp_ies)
2449                 wk->type = IEEE80211_WORK_AUTH;
2450         else
2451                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2452         wk->chan = req->bss->channel;
2453         wk->chan_type = NL80211_CHAN_NO_HT;
2454         wk->sdata = sdata;
2455         wk->done = ieee80211_probe_auth_done;
2456
2457         ieee80211_add_work(wk);
2458         return 0;
2459 }
2460
2461 /* create and insert a dummy station entry */
2462 static int ieee80211_pre_assoc(struct ieee80211_sub_if_data *sdata,
2463                                 u8 *bssid) {
2464         struct sta_info *sta;
2465         int err;
2466
2467         sta = sta_info_alloc(sdata, bssid, GFP_KERNEL);
2468         if (!sta)
2469                 return -ENOMEM;
2470
2471         sta->dummy = true;
2472
2473         err = sta_info_insert(sta);
2474         sta = NULL;
2475         if (err) {
2476                 printk(KERN_DEBUG "%s: failed to insert Dummy STA entry for"
2477                        " the AP (error %d)\n", sdata->name, err);
2478                 return err;
2479         }
2480
2481         return 0;
2482 }
2483
2484 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2485                                                   struct sk_buff *skb)
2486 {
2487         struct ieee80211_local *local = wk->sdata->local;
2488         struct ieee80211_mgmt *mgmt;
2489         struct ieee80211_rx_status *rx_status;
2490         struct ieee802_11_elems elems;
2491         struct cfg80211_bss *cbss = wk->assoc.bss;
2492         u16 status;
2493
2494         if (!skb) {
2495                 sta_info_destroy_addr(wk->sdata, cbss->bssid);
2496                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2497                 goto destroy;
2498         }
2499
2500         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2501                 mutex_lock(&wk->sdata->u.mgd.mtx);
2502                 rx_status = (void *) skb->cb;
2503                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2504                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2505                                       &elems, true);
2506                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2507
2508                 wk->type = IEEE80211_WORK_ASSOC;
2509                 /* not really done yet */
2510                 return WORK_DONE_REQUEUE;
2511         }
2512
2513         mgmt = (void *)skb->data;
2514         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2515
2516         if (status == WLAN_STATUS_SUCCESS) {
2517                 if (wk->assoc.synced)
2518                         drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2519                                            IEEE80211_TX_SYNC_ASSOC);
2520
2521                 mutex_lock(&wk->sdata->u.mgd.mtx);
2522                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2523                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2524                         /* oops -- internal error -- send timeout for now */
2525                         sta_info_destroy_addr(wk->sdata, cbss->bssid);
2526                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2527                                                     wk->filter_ta);
2528                         return WORK_DONE_DESTROY;
2529                 }
2530
2531                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2532         } else {
2533                 /* assoc failed - destroy the dummy station entry */
2534                 sta_info_destroy_addr(wk->sdata, cbss->bssid);
2535         }
2536
2537         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2538  destroy:
2539         if (wk->assoc.synced)
2540                 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2541                                    IEEE80211_TX_SYNC_ASSOC);
2542
2543         return WORK_DONE_DESTROY;
2544 }
2545
2546 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2547                         struct cfg80211_assoc_request *req)
2548 {
2549         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2550         struct ieee80211_bss *bss = (void *)req->bss->priv;
2551         struct ieee80211_work *wk;
2552         const u8 *ssid;
2553         int i, err;
2554
2555         mutex_lock(&ifmgd->mtx);
2556         if (ifmgd->associated) {
2557                 if (!req->prev_bssid ||
2558                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2559                            ETH_ALEN)) {
2560                         /*
2561                          * We are already associated and the request was not a
2562                          * reassociation request from the current BSS, so
2563                          * reject it.
2564                          */
2565                         mutex_unlock(&ifmgd->mtx);
2566                         return -EALREADY;
2567                 }
2568
2569                 /* Trying to reassociate - clear previous association state */
2570                 ieee80211_set_disassoc(sdata, true, false);
2571         }
2572         mutex_unlock(&ifmgd->mtx);
2573
2574         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2575         if (!wk)
2576                 return -ENOMEM;
2577
2578         /*
2579          * create a dummy station info entry in order
2580          * to start accepting incoming EAPOL packets from the station
2581          */
2582         err = ieee80211_pre_assoc(sdata, req->bss->bssid);
2583         if (err) {
2584                 kfree(wk);
2585                 return err;
2586         }
2587
2588         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2589         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2590
2591         ifmgd->beacon_crc_valid = false;
2592
2593         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2594                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2595                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2596                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2597                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2598
2599
2600         if (req->ie && req->ie_len) {
2601                 memcpy(wk->ie, req->ie, req->ie_len);
2602                 wk->ie_len = req->ie_len;
2603         } else
2604                 wk->ie_len = 0;
2605
2606         wk->assoc.bss = req->bss;
2607
2608         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2609
2610         /* new association always uses requested smps mode */
2611         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2612                 if (ifmgd->powersave)
2613                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2614                 else
2615                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2616         } else
2617                 ifmgd->ap_smps = ifmgd->req_smps;
2618
2619         wk->assoc.smps = ifmgd->ap_smps;
2620         /*
2621          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2622          * We still associate in non-HT mode (11a/b/g) if any one of these
2623          * ciphers is configured as pairwise.
2624          * We can set this to true for non-11n hardware, that'll be checked
2625          * separately along with the peer capabilities.
2626          */
2627         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2628         wk->assoc.capability = req->bss->capability;
2629         wk->assoc.wmm_used = bss->wmm_used;
2630         wk->assoc.supp_rates = bss->supp_rates;
2631         wk->assoc.supp_rates_len = bss->supp_rates_len;
2632         wk->assoc.ht_information_ie =
2633                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2634
2635         if (bss->wmm_used && bss->uapsd_supported &&
2636             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2637                 wk->assoc.uapsd_used = true;
2638                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2639         } else {
2640                 wk->assoc.uapsd_used = false;
2641                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2642         }
2643
2644         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2645         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2646         wk->assoc.ssid_len = ssid[1];
2647
2648         if (req->prev_bssid)
2649                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2650
2651         wk->chan = req->bss->channel;
2652         wk->chan_type = NL80211_CHAN_NO_HT;
2653         wk->sdata = sdata;
2654         wk->done = ieee80211_assoc_done;
2655         if (!bss->dtim_period &&
2656             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2657                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2658         else
2659                 wk->type = IEEE80211_WORK_ASSOC;
2660
2661         if (req->use_mfp) {
2662                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2663                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2664         } else {
2665                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2666                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2667         }
2668
2669         if (req->crypto.control_port)
2670                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2671         else
2672                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2673
2674         sdata->control_port_protocol = req->crypto.control_port_ethertype;
2675         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2676
2677         ieee80211_add_work(wk);
2678         return 0;
2679 }
2680
2681 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2682                          struct cfg80211_deauth_request *req,
2683                          void *cookie)
2684 {
2685         struct ieee80211_local *local = sdata->local;
2686         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2687         struct ieee80211_work *wk;
2688         u8 bssid[ETH_ALEN];
2689         bool assoc_bss = false;
2690
2691         mutex_lock(&ifmgd->mtx);
2692
2693         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2694         if (ifmgd->associated == req->bss) {
2695                 ieee80211_set_disassoc(sdata, false, true);
2696                 mutex_unlock(&ifmgd->mtx);
2697                 assoc_bss = true;
2698         } else {
2699                 bool not_auth_yet = false;
2700
2701                 mutex_unlock(&ifmgd->mtx);
2702
2703                 mutex_lock(&local->mtx);
2704                 list_for_each_entry(wk, &local->work_list, list) {
2705                         if (wk->sdata != sdata)
2706                                 continue;
2707
2708                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2709                             wk->type != IEEE80211_WORK_AUTH &&
2710                             wk->type != IEEE80211_WORK_ASSOC &&
2711                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2712                                 continue;
2713
2714                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2715                                 continue;
2716
2717                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2718                         list_del_rcu(&wk->list);
2719                         free_work(wk);
2720                         break;
2721                 }
2722                 mutex_unlock(&local->mtx);
2723
2724                 /*
2725                  * If somebody requests authentication and we haven't
2726                  * sent out an auth frame yet there's no need to send
2727                  * out a deauth frame either. If the state was PROBE,
2728                  * then this is the case. If it's AUTH we have sent a
2729                  * frame, and if it's IDLE we have completed the auth
2730                  * process already.
2731                  */
2732                 if (not_auth_yet) {
2733                         __cfg80211_auth_canceled(sdata->dev, bssid);
2734                         return 0;
2735                 }
2736         }
2737
2738         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2739                sdata->name, bssid, req->reason_code);
2740
2741         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2742                                        req->reason_code, cookie,
2743                                        !req->local_state_change);
2744         if (assoc_bss)
2745                 sta_info_flush(sdata->local, sdata);
2746
2747         mutex_lock(&sdata->local->mtx);
2748         ieee80211_recalc_idle(sdata->local);
2749         mutex_unlock(&sdata->local->mtx);
2750
2751         return 0;
2752 }
2753
2754 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2755                            struct cfg80211_disassoc_request *req,
2756                            void *cookie)
2757 {
2758         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2759         u8 bssid[ETH_ALEN];
2760
2761         mutex_lock(&ifmgd->mtx);
2762
2763         /*
2764          * cfg80211 should catch this ... but it's racy since
2765          * we can receive a disassoc frame, process it, hand it
2766          * to cfg80211 while that's in a locked section already
2767          * trying to tell us that the user wants to disconnect.
2768          */
2769         if (ifmgd->associated != req->bss) {
2770                 mutex_unlock(&ifmgd->mtx);
2771                 return -ENOLINK;
2772         }
2773
2774         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2775                sdata->name, req->bss->bssid, req->reason_code);
2776
2777         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2778         ieee80211_set_disassoc(sdata, false, true);
2779
2780         mutex_unlock(&ifmgd->mtx);
2781
2782         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2783                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2784                         cookie, !req->local_state_change);
2785         sta_info_flush(sdata->local, sdata);
2786
2787         mutex_lock(&sdata->local->mtx);
2788         ieee80211_recalc_idle(sdata->local);
2789         mutex_unlock(&sdata->local->mtx);
2790
2791         return 0;
2792 }
2793
2794 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2795                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2796                                gfp_t gfp)
2797 {
2798         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2799
2800         trace_api_cqm_rssi_notify(sdata, rssi_event);
2801
2802         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2803 }
2804 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
2805
2806 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
2807 {
2808         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2809         return sdata->dev->operstate;
2810 }
2811 EXPORT_SYMBOL(ieee80211_get_operstate);