net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/pm_qos_params.h>
  21 #include <linux/crc32.h>
  22 #include <linux/slab.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "driver-ops.h"
  28 #include "rate.h"
  29 #include "led.h"
  30
  31 #define IEEE80211_MAX_PROBE_TRIES 5
  32
  33 /*
  34  * beacon loss detection timeout
  35  * XXX: should depend on beacon interval
  36  */
  37 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
  38 /*
  39  * Time the connection can be idle before we probe
  40  * it to see if we can still talk to the AP.
  41  */
  42 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  43 /*
  44  * Time we wait for a probe response after sending
  45  * a probe request because of beacon loss or for
  46  * checking the connection still works.
  47  */
  48 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  49
  50 /*
  51  * Weight given to the latest Beacon frame when calculating average signal
  52  * strength for Beacon frames received in the current BSS. This must be
  53  * between 1 and 15.
  54  */
  55 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  56
  57 #define TMR_RUNNING_TIMER       0
  58 #define TMR_RUNNING_CHANSW      1
  59
  60 /*
  61  * All cfg80211 functions have to be called outside a locked
  62  * section so that they can acquire a lock themselves... This
  63  * is much simpler than queuing up things in cfg80211, but we
  64  * do need some indirection for that here.
  65  */
  66 enum rx_mgmt_action {
  67         /* no action required */
  68         RX_MGMT_NONE,
  69
  70         /* caller must call cfg80211_send_rx_auth() */
  71         RX_MGMT_CFG80211_AUTH,
  72
  73         /* caller must call cfg80211_send_rx_assoc() */
  74         RX_MGMT_CFG80211_ASSOC,
  75
  76         /* caller must call cfg80211_send_deauth() */
  77         RX_MGMT_CFG80211_DEAUTH,
  78
  79         /* caller must call cfg80211_send_disassoc() */
  80         RX_MGMT_CFG80211_DISASSOC,
  81
  82         /* caller must tell cfg80211 about internal error */
  83         RX_MGMT_CFG80211_ASSOC_ERROR,
  84 };
  85
  86 /* utils */
  87 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  88 {
  89         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  90 }
  91
  92 /*
  93  * We can have multiple work items (and connection probing)
  94  * scheduling this timer, but we need to take care to only
  95  * reschedule it when it should fire _earlier_ than it was
  96  * asked for before, or if it's not pending right now. This
  97  * function ensures that. Note that it then is required to
  98  * run this function for all timeouts after the first one
  99  * has happened -- the work that runs from this timer will
 100  * do that.
 101  */
 102 static void run_again(struct ieee80211_if_managed *ifmgd,
 103                              unsigned long timeout)
 104 {
 105         ASSERT_MGD_MTX(ifmgd);
 106
 107         if (!timer_pending(&ifmgd->timer) ||
 108             time_before(timeout, ifmgd->timer.expires))
 109                 mod_timer(&ifmgd->timer, timeout);
 110 }
 111
 112 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 113 {
 114         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 115                 return;
 116
 117         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 118                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 119 }
 120
 121 static int ecw2cw(int ecw)
 122 {
 123         return (1 << ecw) - 1;
 124 }
 125
 126 /*
 127  * ieee80211_enable_ht should be called only after the operating band
 128  * has been determined as ht configuration depends on the hw's
 129  * HT abilities for a specific band.
 130  */
 131 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 132                                struct ieee80211_ht_info *hti,
 133                                const u8 *bssid, u16 ap_ht_cap_flags)
 134 {
 135         struct ieee80211_local *local = sdata->local;
 136         struct ieee80211_supported_band *sband;
 137         struct sta_info *sta;
 138         u32 changed = 0;
 139         u16 ht_opmode;
 140         bool enable_ht = true;
 141         enum nl80211_channel_type prev_chantype;
 142         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 143
 144         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 145
 146         prev_chantype = sdata->vif.bss_conf.channel_type;
 147
 148         /* HT is not supported */
 149         if (!sband->ht_cap.ht_supported)
 150                 enable_ht = false;
 151
 152         /* check that channel matches the right operating channel */
 153         if (local->hw.conf.channel->center_freq !=
 154             ieee80211_channel_to_frequency(hti->control_chan))
 155                 enable_ht = false;
 156
 157         if (enable_ht) {
 158                 channel_type = NL80211_CHAN_HT20;
 159
 160                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 161                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 162                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 163                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 164                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 165                                 if (!(local->hw.conf.channel->flags &
 166                                     IEEE80211_CHAN_NO_HT40PLUS))
 167                                         channel_type = NL80211_CHAN_HT40PLUS;
 168                                 break;
 169                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 170                                 if (!(local->hw.conf.channel->flags &
 171                                     IEEE80211_CHAN_NO_HT40MINUS))
 172                                         channel_type = NL80211_CHAN_HT40MINUS;
 173                                 break;
 174                         }
 175                 }
 176         }
 177
 178         if (local->tmp_channel)
 179                 local->tmp_channel_type = channel_type;
 180
 181         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 182                 /* can only fail due to HT40+/- mismatch */
 183                 channel_type = NL80211_CHAN_HT20;
 184                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 185         }
 186
 187         /* channel_type change automatically detected */
 188         ieee80211_hw_config(local, 0);
 189
 190         if (prev_chantype != channel_type) {
 191                 rcu_read_lock();
 192                 sta = sta_info_get(sdata, bssid);
 193                 if (sta)
 194                         rate_control_rate_update(local, sband, sta,
 195                                                  IEEE80211_RC_HT_CHANGED,
 196                                                  channel_type);
 197                 rcu_read_unlock();
 198         }
 199
 200         ht_opmode = le16_to_cpu(hti->operation_mode);
 201
 202         /* if bss configuration changed store the new one */
 203         if (sdata->ht_opmode_valid != enable_ht ||
 204             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 205             prev_chantype != channel_type) {
 206                 changed |= BSS_CHANGED_HT;
 207                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 208                 sdata->ht_opmode_valid = enable_ht;
 209         }
 210
 211         return changed;
 212 }
 213
 214 /* frame sending functions */
 215
 216 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 217                                            const u8 *bssid, u16 stype, u16 reason,
 218                                            void *cookie, bool send_frame)
 219 {
 220         struct ieee80211_local *local = sdata->local;
 221         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 222         struct sk_buff *skb;
 223         struct ieee80211_mgmt *mgmt;
 224
 225         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 226         if (!skb) {
 227                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 228                        "deauth/disassoc frame\n", sdata->name);
 229                 return;
 230         }
 231         skb_reserve(skb, local->hw.extra_tx_headroom);
 232
 233         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 234         memset(mgmt, 0, 24);
 235         memcpy(mgmt->da, bssid, ETH_ALEN);
 236         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 237         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 238         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 239         skb_put(skb, 2);
 240         /* u.deauth.reason_code == u.disassoc.reason_code */
 241         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 242
 243         if (stype == IEEE80211_STYPE_DEAUTH)
 244                 if (cookie)
 245                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 246                 else
 247                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 248         else
 249                 if (cookie)
 250                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 251                 else
 252                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 253         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 254                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 255
 256         if (send_frame)
 257                 ieee80211_tx_skb(sdata, skb);
 258         else
 259                 kfree_skb(skb);
 260 }
 261
 262 void ieee80211_send_pspoll(struct ieee80211_local *local,
 263                            struct ieee80211_sub_if_data *sdata)
 264 {
 265         struct ieee80211_pspoll *pspoll;
 266         struct sk_buff *skb;
 267
 268         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 269         if (!skb)
 270                 return;
 271
 272         pspoll = (struct ieee80211_pspoll *) skb->data;
 273         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 274
 275         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 276         ieee80211_tx_skb(sdata, skb);
 277 }
 278
 279 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 280                              struct ieee80211_sub_if_data *sdata,
 281                              int powersave)
 282 {
 283         struct sk_buff *skb;
 284         struct ieee80211_hdr_3addr *nullfunc;
 285
 286         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 287         if (!skb)
 288                 return;
 289
 290         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 291         if (powersave)
 292                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 293
 294         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 295         ieee80211_tx_skb(sdata, skb);
 296 }
 297
 298 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 299                                           struct ieee80211_sub_if_data *sdata)
 300 {
 301         struct sk_buff *skb;
 302         struct ieee80211_hdr *nullfunc;
 303         __le16 fc;
 304
 305         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 306                 return;
 307
 308         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 309         if (!skb) {
 310                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 311                        "nullfunc frame\n", sdata->name);
 312                 return;
 313         }
 314         skb_reserve(skb, local->hw.extra_tx_headroom);
 315
 316         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 317         memset(nullfunc, 0, 30);
 318         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 319                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 320         nullfunc->frame_control = fc;
 321         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 322         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 323         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 324         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 325
 326         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 327         ieee80211_tx_skb(sdata, skb);
 328 }
 329
 330 /* spectrum management related things */
 331 static void ieee80211_chswitch_work(struct work_struct *work)
 332 {
 333         struct ieee80211_sub_if_data *sdata =
 334                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 335         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 336
 337         if (!ieee80211_sdata_running(sdata))
 338                 return;
 339
 340         mutex_lock(&ifmgd->mtx);
 341         if (!ifmgd->associated)
 342                 goto out;
 343
 344         sdata->local->oper_channel = sdata->local->csa_channel;
 345         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
 346
 347         /* XXX: shouldn't really modify cfg80211-owned data! */
 348         ifmgd->associated->channel = sdata->local->oper_channel;
 349
 350         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 351                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 352  out:
 353         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 354         mutex_unlock(&ifmgd->mtx);
 355 }
 356
 357 static void ieee80211_chswitch_timer(unsigned long data)
 358 {
 359         struct ieee80211_sub_if_data *sdata =
 360                 (struct ieee80211_sub_if_data *) data;
 361         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 362
 363         if (sdata->local->quiescing) {
 364                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 365                 return;
 366         }
 367
 368         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 369 }
 370
 371 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 372                                       struct ieee80211_channel_sw_ie *sw_elem,
 373                                       struct ieee80211_bss *bss)
 374 {
 375         struct cfg80211_bss *cbss =
 376                 container_of((void *)bss, struct cfg80211_bss, priv);
 377         struct ieee80211_channel *new_ch;
 378         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 379         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 380
 381         ASSERT_MGD_MTX(ifmgd);
 382
 383         if (!ifmgd->associated)
 384                 return;
 385
 386         if (sdata->local->scanning)
 387                 return;
 388
 389         /* Disregard subsequent beacons if we are already running a timer
 390            processing a CSA */
 391
 392         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 393                 return;
 394
 395         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 396         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 397                 return;
 398
 399         sdata->local->csa_channel = new_ch;
 400
 401         if (sw_elem->count <= 1) {
 402                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 403         } else {
 404                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 405                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 406                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 407                 mod_timer(&ifmgd->chswitch_timer,
 408                           jiffies +
 409                           msecs_to_jiffies(sw_elem->count *
 410                                            cbss->beacon_interval));
 411         }
 412 }
 413
 414 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 415                                         u16 capab_info, u8 *pwr_constr_elem,
 416                                         u8 pwr_constr_elem_len)
 417 {
 418         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 419
 420         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 421                 return;
 422
 423         /* Power constraint IE length should be 1 octet */
 424         if (pwr_constr_elem_len != 1)
 425                 return;
 426
 427         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 428             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 429                 sdata->local->power_constr_level = *pwr_constr_elem;
 430                 ieee80211_hw_config(sdata->local, 0);
 431         }
 432 }
 433
 434 /* powersave */
 435 static void ieee80211_enable_ps(struct ieee80211_local *local,
 436                                 struct ieee80211_sub_if_data *sdata)
 437 {
 438         struct ieee80211_conf *conf = &local->hw.conf;
 439
 440         /*
 441          * If we are scanning right now then the parameters will
 442          * take effect when scan finishes.
 443          */
 444         if (local->scanning)
 445                 return;
 446
 447         if (conf->dynamic_ps_timeout > 0 &&
 448             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 449                 mod_timer(&local->dynamic_ps_timer, jiffies +
 450                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 451         } else {
 452                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 453                         ieee80211_send_nullfunc(local, sdata, 1);
 454
 455                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 456                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 457                         return;
 458
 459                 conf->flags |= IEEE80211_CONF_PS;
 460                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 461         }
 462 }
 463
 464 static void ieee80211_change_ps(struct ieee80211_local *local)
 465 {
 466         struct ieee80211_conf *conf = &local->hw.conf;
 467
 468         if (local->ps_sdata) {
 469                 ieee80211_enable_ps(local, local->ps_sdata);
 470         } else if (conf->flags & IEEE80211_CONF_PS) {
 471                 conf->flags &= ~IEEE80211_CONF_PS;
 472                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 473                 del_timer_sync(&local->dynamic_ps_timer);
 474                 cancel_work_sync(&local->dynamic_ps_enable_work);
 475         }
 476 }
 477
 478 /* need to hold RTNL or interface lock */
 479 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 480 {
 481         struct ieee80211_sub_if_data *sdata, *found = NULL;
 482         int count = 0;
 483         int timeout;
 484
 485         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 486                 local->ps_sdata = NULL;
 487                 return;
 488         }
 489
 490         if (!list_empty(&local->work_list)) {
 491                 local->ps_sdata = NULL;
 492                 goto change;
 493         }
 494
 495         list_for_each_entry(sdata, &local->interfaces, list) {
 496                 if (!ieee80211_sdata_running(sdata))
 497                         continue;
 498                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 499                         continue;
 500                 found = sdata;
 501                 count++;
 502         }
 503
 504         if (count == 1 && found->u.mgd.powersave &&
 505             found->u.mgd.associated &&
 506             found->u.mgd.associated->beacon_ies &&
 507             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 508                                     IEEE80211_STA_CONNECTION_POLL))) {
 509                 s32 beaconint_us;
 510
 511                 if (latency < 0)
 512                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 513
 514                 beaconint_us = ieee80211_tu_to_usec(
 515                                         found->vif.bss_conf.beacon_int);
 516
 517                 timeout = local->hw.conf.dynamic_ps_forced_timeout;
 518                 if (timeout < 0) {
 519                         /*
 520                          * The 2 second value is there for compatibility until
 521                          * the PM_QOS_NETWORK_LATENCY is configured with real
 522                          * values.
 523                          */
 524                         if (latency == 2000000000)
 525                                 timeout = 100;
 526                         else if (latency <= 50000)
 527                                 timeout = 300;
 528                         else if (latency <= 100000)
 529                                 timeout = 100;
 530                         else if (latency <= 500000)
 531                                 timeout = 50;
 532                         else
 533                                 timeout = 0;
 534                 }
 535                 local->hw.conf.dynamic_ps_timeout = timeout;
 536
 537                 if (beaconint_us > latency) {
 538                         local->ps_sdata = NULL;
 539                 } else {
 540                         struct ieee80211_bss *bss;
 541                         int maxslp = 1;
 542                         u8 dtimper;
 543
 544                         bss = (void *)found->u.mgd.associated->priv;
 545                         dtimper = bss->dtim_period;
 546
 547                         /* If the TIM IE is invalid, pretend the value is 1 */
 548                         if (!dtimper)
 549                                 dtimper = 1;
 550                         else if (dtimper > 1)
 551                                 maxslp = min_t(int, dtimper,
 552                                                     latency / beaconint_us);
 553
 554                         local->hw.conf.max_sleep_period = maxslp;
 555                         local->hw.conf.ps_dtim_period = dtimper;
 556                         local->ps_sdata = found;
 557                 }
 558         } else {
 559                 local->ps_sdata = NULL;
 560         }
 561
 562  change:
 563         ieee80211_change_ps(local);
 564 }
 565
 566 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 567 {
 568         struct ieee80211_local *local =
 569                 container_of(work, struct ieee80211_local,
 570                              dynamic_ps_disable_work);
 571
 572         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 573                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 574                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 575         }
 576
 577         ieee80211_wake_queues_by_reason(&local->hw,
 578                                         IEEE80211_QUEUE_STOP_REASON_PS);
 579 }
 580
 581 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 582 {
 583         struct ieee80211_local *local =
 584                 container_of(work, struct ieee80211_local,
 585                              dynamic_ps_enable_work);
 586         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 587         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 588
 589         /* can only happen when PS was just disabled anyway */
 590         if (!sdata)
 591                 return;
 592
 593         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 594                 return;
 595
 596         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 597             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 598                 ieee80211_send_nullfunc(local, sdata, 1);
 599
 600         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 601               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 602             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 603                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 604                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 605                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 606         }
 607 }
 608
 609 void ieee80211_dynamic_ps_timer(unsigned long data)
 610 {
 611         struct ieee80211_local *local = (void *) data;
 612
 613         if (local->quiescing || local->suspended)
 614                 return;
 615
 616         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 617 }
 618
 619 /* MLME */
 620 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 621                                      struct ieee80211_if_managed *ifmgd,
 622                                      u8 *wmm_param, size_t wmm_param_len)
 623 {
 624         struct ieee80211_tx_queue_params params;
 625         size_t left;
 626         int count;
 627         u8 *pos, uapsd_queues = 0;
 628
 629         if (!local->ops->conf_tx)
 630                 return;
 631
 632         if (local->hw.queues < 4)
 633                 return;
 634
 635         if (!wmm_param)
 636                 return;
 637
 638         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 639                 return;
 640
 641         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 642                 uapsd_queues = local->uapsd_queues;
 643
 644         count = wmm_param[6] & 0x0f;
 645         if (count == ifmgd->wmm_last_param_set)
 646                 return;
 647         ifmgd->wmm_last_param_set = count;
 648
 649         pos = wmm_param + 8;
 650         left = wmm_param_len - 8;
 651
 652         memset(&params, 0, sizeof(params));
 653
 654         local->wmm_acm = 0;
 655         for (; left >= 4; left -= 4, pos += 4) {
 656                 int aci = (pos[0] >> 5) & 0x03;
 657                 int acm = (pos[0] >> 4) & 0x01;
 658                 bool uapsd = false;
 659                 int queue;
 660
 661                 switch (aci) {
 662                 case 1: /* AC_BK */
 663                         queue = 3;
 664                         if (acm)
 665                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 666                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 667                                 uapsd = true;
 668                         break;
 669                 case 2: /* AC_VI */
 670                         queue = 1;
 671                         if (acm)
 672                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 673                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 674                                 uapsd = true;
 675                         break;
 676                 case 3: /* AC_VO */
 677                         queue = 0;
 678                         if (acm)
 679                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 680                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 681                                 uapsd = true;
 682                         break;
 683                 case 0: /* AC_BE */
 684                 default:
 685                         queue = 2;
 686                         if (acm)
 687                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 688                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 689                                 uapsd = true;
 690                         break;
 691                 }
 692
 693                 params.aifs = pos[0] & 0x0f;
 694                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 695                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 696                 params.txop = get_unaligned_le16(pos + 2);
 697                 params.uapsd = uapsd;
 698
 699 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 700                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 701                        "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 702                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 703                        params.aifs, params.cw_min, params.cw_max, params.txop,
 704                        params.uapsd);
 705 #endif
 706                 if (drv_conf_tx(local, queue, &params))
 707                         printk(KERN_DEBUG "%s: failed to set TX queue "
 708                                "parameters for queue %d\n",
 709                                wiphy_name(local->hw.wiphy), queue);
 710         }
 711
 712         /* enable WMM or activate new settings */
 713         local->hw.conf.flags |= IEEE80211_CONF_QOS;
 714         drv_config(local, IEEE80211_CONF_CHANGE_QOS);
 715 }
 716
 717 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 718                                            u16 capab, bool erp_valid, u8 erp)
 719 {
 720         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 721         u32 changed = 0;
 722         bool use_protection;
 723         bool use_short_preamble;
 724         bool use_short_slot;
 725
 726         if (erp_valid) {
 727                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 728                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 729         } else {
 730                 use_protection = false;
 731                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 732         }
 733
 734         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 735         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 736                 use_short_slot = true;
 737
 738         if (use_protection != bss_conf->use_cts_prot) {
 739                 bss_conf->use_cts_prot = use_protection;
 740                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 741         }
 742
 743         if (use_short_preamble != bss_conf->use_short_preamble) {
 744                 bss_conf->use_short_preamble = use_short_preamble;
 745                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 746         }
 747
 748         if (use_short_slot != bss_conf->use_short_slot) {
 749                 bss_conf->use_short_slot = use_short_slot;
 750                 changed |= BSS_CHANGED_ERP_SLOT;
 751         }
 752
 753         return changed;
 754 }
 755
 756 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 757                                      struct cfg80211_bss *cbss,
 758                                      u32 bss_info_changed)
 759 {
 760         struct ieee80211_bss *bss = (void *)cbss->priv;
 761         struct ieee80211_local *local = sdata->local;
 762
 763         bss_info_changed |= BSS_CHANGED_ASSOC;
 764         /* set timing information */
 765         sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
 766         sdata->vif.bss_conf.timestamp = cbss->tsf;
 767
 768         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 769         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 770                 cbss->capability, bss->has_erp_value, bss->erp_value);
 771
 772         sdata->u.mgd.associated = cbss;
 773         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 774
 775         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 776
 777         /* just to be sure */
 778         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 779                                 IEEE80211_STA_BEACON_POLL);
 780
 781         /*
 782          * Always handle WMM once after association regardless
 783          * of the first value the AP uses. Setting -1 here has
 784          * that effect because the AP values is an unsigned
 785          * 4-bit value.
 786          */
 787         sdata->u.mgd.wmm_last_param_set = -1;
 788
 789         ieee80211_led_assoc(local, 1);
 790
 791         sdata->vif.bss_conf.assoc = 1;
 792         /*
 793          * For now just always ask the driver to update the basic rateset
 794          * when we have associated, we aren't checking whether it actually
 795          * changed or not.
 796          */
 797         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 798
 799         /* And the BSSID changed - we're associated now */
 800         bss_info_changed |= BSS_CHANGED_BSSID;
 801
 802         /* Tell the driver to monitor connection quality (if supported) */
 803         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 804             sdata->vif.bss_conf.cqm_rssi_thold)
 805                 bss_info_changed |= BSS_CHANGED_CQM;
 806
 807         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 808
 809         mutex_lock(&local->iflist_mtx);
 810         ieee80211_recalc_ps(local, -1);
 811         ieee80211_recalc_smps(local, sdata);
 812         mutex_unlock(&local->iflist_mtx);
 813
 814         netif_tx_start_all_queues(sdata->dev);
 815         netif_carrier_on(sdata->dev);
 816 }
 817
 818 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 819                                    bool remove_sta)
 820 {
 821         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 822         struct ieee80211_local *local = sdata->local;
 823         struct sta_info *sta;
 824         u32 changed = 0, config_changed = 0;
 825         u8 bssid[ETH_ALEN];
 826
 827         ASSERT_MGD_MTX(ifmgd);
 828
 829         if (WARN_ON(!ifmgd->associated))
 830                 return;
 831
 832         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 833
 834         ifmgd->associated = NULL;
 835         memset(ifmgd->bssid, 0, ETH_ALEN);
 836
 837         /*
 838          * we need to commit the associated = NULL change because the
 839          * scan code uses that to determine whether this iface should
 840          * go to/wake up from powersave or not -- and could otherwise
 841          * wake the queues erroneously.
 842          */
 843         smp_mb();
 844
 845         /*
 846          * Thus, we can only afterwards stop the queues -- to account
 847          * for the case where another CPU is finishing a scan at this
 848          * time -- we don't want the scan code to enable queues.
 849          */
 850
 851         netif_tx_stop_all_queues(sdata->dev);
 852         netif_carrier_off(sdata->dev);
 853
 854         rcu_read_lock();
 855         sta = sta_info_get(sdata, bssid);
 856         if (sta) {
 857                 set_sta_flags(sta, WLAN_STA_DISASSOC);
 858                 ieee80211_sta_tear_down_BA_sessions(sta);
 859         }
 860         rcu_read_unlock();
 861
 862         changed |= ieee80211_reset_erp_info(sdata);
 863
 864         ieee80211_led_assoc(local, 0);
 865         changed |= BSS_CHANGED_ASSOC;
 866         sdata->vif.bss_conf.assoc = false;
 867
 868         ieee80211_set_wmm_default(sdata);
 869
 870         /* channel(_type) changes are handled by ieee80211_hw_config */
 871         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
 872
 873         /* on the next assoc, re-program HT parameters */
 874         sdata->ht_opmode_valid = false;
 875
 876         local->power_constr_level = 0;
 877
 878         del_timer_sync(&local->dynamic_ps_timer);
 879         cancel_work_sync(&local->dynamic_ps_enable_work);
 880
 881         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 882                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 883                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 884         }
 885
 886         ieee80211_hw_config(local, config_changed);
 887
 888         /* The BSSID (not really interesting) and HT changed */
 889         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
 890         ieee80211_bss_info_change_notify(sdata, changed);
 891
 892         if (remove_sta)
 893                 sta_info_destroy_addr(sdata, bssid);
 894 }
 895
 896 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 897                              struct ieee80211_hdr *hdr)
 898 {
 899         /*
 900          * We can postpone the mgd.timer whenever receiving unicast frames
 901          * from AP because we know that the connection is working both ways
 902          * at that time. But multicast frames (and hence also beacons) must
 903          * be ignored here, because we need to trigger the timer during
 904          * data idle periods for sending the periodic probe request to the
 905          * AP we're connected to.
 906          */
 907         if (is_multicast_ether_addr(hdr->addr1))
 908                 return;
 909
 910         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 911                 return;
 912
 913         mod_timer(&sdata->u.mgd.conn_mon_timer,
 914                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 915 }
 916
 917 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
 918 {
 919         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 920         const u8 *ssid;
 921
 922         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
 923         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
 924                                  ssid + 2, ssid[1], NULL, 0);
 925
 926         ifmgd->probe_send_count++;
 927         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
 928         run_again(ifmgd, ifmgd->probe_timeout);
 929 }
 930
 931 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
 932                                    bool beacon)
 933 {
 934         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 935         bool already = false;
 936
 937         if (!ieee80211_sdata_running(sdata))
 938                 return;
 939
 940         if (sdata->local->scanning)
 941                 return;
 942
 943         if (sdata->local->tmp_channel)
 944                 return;
 945
 946         mutex_lock(&ifmgd->mtx);
 947
 948         if (!ifmgd->associated)
 949                 goto out;
 950
 951 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 952         if (beacon && net_ratelimit())
 953                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
 954                        "- sending probe request\n", sdata->name);
 955 #endif
 956
 957         /*
 958          * The driver/our work has already reported this event or the
 959          * connection monitoring has kicked in and we have already sent
 960          * a probe request. Or maybe the AP died and the driver keeps
 961          * reporting until we disassociate...
 962          *
 963          * In either case we have to ignore the current call to this
 964          * function (except for setting the correct probe reason bit)
 965          * because otherwise we would reset the timer every time and
 966          * never check whether we received a probe response!
 967          */
 968         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 969                             IEEE80211_STA_CONNECTION_POLL))
 970                 already = true;
 971
 972         if (beacon)
 973                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
 974         else
 975                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
 976
 977         if (already)
 978                 goto out;
 979
 980         mutex_lock(&sdata->local->iflist_mtx);
 981         ieee80211_recalc_ps(sdata->local, -1);
 982         mutex_unlock(&sdata->local->iflist_mtx);
 983
 984         ifmgd->probe_send_count = 0;
 985         ieee80211_mgd_probe_ap_send(sdata);
 986  out:
 987         mutex_unlock(&ifmgd->mtx);
 988 }
 989
 990 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
 991 {
 992         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 993         struct ieee80211_local *local = sdata->local;
 994         u8 bssid[ETH_ALEN];
 995
 996         mutex_lock(&ifmgd->mtx);
 997         if (!ifmgd->associated) {
 998                 mutex_unlock(&ifmgd->mtx);
 999                 return;
1000         }
1001
1002         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1003
1004         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1005
1006         ieee80211_set_disassoc(sdata, true);
1007         ieee80211_recalc_idle(local);
1008         mutex_unlock(&ifmgd->mtx);
1009         /*
1010          * must be outside lock due to cfg80211,
1011          * but that's not a problem.
1012          */
1013         ieee80211_send_deauth_disassoc(sdata, bssid,
1014                                        IEEE80211_STYPE_DEAUTH,
1015                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1016                                        NULL, true);
1017 }
1018
1019 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1020 {
1021         struct ieee80211_sub_if_data *sdata =
1022                 container_of(work, struct ieee80211_sub_if_data,
1023                              u.mgd.beacon_connection_loss_work);
1024
1025         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1026                 __ieee80211_connection_loss(sdata);
1027         else
1028                 ieee80211_mgd_probe_ap(sdata, true);
1029 }
1030
1031 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1032 {
1033         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1034         struct ieee80211_hw *hw = &sdata->local->hw;
1035
1036         trace_api_beacon_loss(sdata);
1037
1038         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1039         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1040 }
1041 EXPORT_SYMBOL(ieee80211_beacon_loss);
1042
1043 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1044 {
1045         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1046         struct ieee80211_hw *hw = &sdata->local->hw;
1047
1048         trace_api_connection_loss(sdata);
1049
1050         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1051         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1052 }
1053 EXPORT_SYMBOL(ieee80211_connection_loss);
1054
1055
1056 static enum rx_mgmt_action __must_check
1057 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1058                          struct ieee80211_mgmt *mgmt, size_t len)
1059 {
1060         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1061         const u8 *bssid = NULL;
1062         u16 reason_code;
1063
1064         if (len < 24 + 2)
1065                 return RX_MGMT_NONE;
1066
1067         ASSERT_MGD_MTX(ifmgd);
1068
1069         bssid = ifmgd->associated->bssid;
1070
1071         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1072
1073         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1074                         sdata->name, bssid, reason_code);
1075
1076         ieee80211_set_disassoc(sdata, true);
1077         ieee80211_recalc_idle(sdata->local);
1078
1079         return RX_MGMT_CFG80211_DEAUTH;
1080 }
1081
1082
1083 static enum rx_mgmt_action __must_check
1084 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1085                            struct ieee80211_mgmt *mgmt, size_t len)
1086 {
1087         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1088         u16 reason_code;
1089
1090         if (len < 24 + 2)
1091                 return RX_MGMT_NONE;
1092
1093         ASSERT_MGD_MTX(ifmgd);
1094
1095         if (WARN_ON(!ifmgd->associated))
1096                 return RX_MGMT_NONE;
1097
1098         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1099                 return RX_MGMT_NONE;
1100
1101         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1102
1103         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1104                         sdata->name, mgmt->sa, reason_code);
1105
1106         ieee80211_set_disassoc(sdata, true);
1107         ieee80211_recalc_idle(sdata->local);
1108         return RX_MGMT_CFG80211_DISASSOC;
1109 }
1110
1111
1112 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1113                                     struct ieee80211_mgmt *mgmt, size_t len)
1114 {
1115         struct ieee80211_sub_if_data *sdata = wk->sdata;
1116         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1117         struct ieee80211_local *local = sdata->local;
1118         struct ieee80211_supported_band *sband;
1119         struct sta_info *sta;
1120         struct cfg80211_bss *cbss = wk->assoc.bss;
1121         u8 *pos;
1122         u32 rates, basic_rates;
1123         u16 capab_info, aid;
1124         struct ieee802_11_elems elems;
1125         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1126         u32 changed = 0;
1127         int i, j, err;
1128         bool have_higher_than_11mbit = false;
1129         u16 ap_ht_cap_flags;
1130
1131         /* AssocResp and ReassocResp have identical structure */
1132
1133         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1134         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1135
1136         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1137                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1138                        "set\n", sdata->name, aid);
1139         aid &= ~(BIT(15) | BIT(14));
1140
1141         pos = mgmt->u.assoc_resp.variable;
1142         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1143
1144         if (!elems.supp_rates) {
1145                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1146                        sdata->name);
1147                 return false;
1148         }
1149
1150         ifmgd->aid = aid;
1151
1152         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1153         if (!sta) {
1154                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1155                        " the AP\n", sdata->name);
1156                 return false;
1157         }
1158
1159         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1160                            WLAN_STA_ASSOC_AP);
1161         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1162                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1163
1164         rates = 0;
1165         basic_rates = 0;
1166         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1167
1168         for (i = 0; i < elems.supp_rates_len; i++) {
1169                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1170                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1171
1172                 if (rate > 110)
1173                         have_higher_than_11mbit = true;
1174
1175                 for (j = 0; j < sband->n_bitrates; j++) {
1176                         if (sband->bitrates[j].bitrate == rate) {
1177                                 rates |= BIT(j);
1178                                 if (is_basic)
1179                                         basic_rates |= BIT(j);
1180                                 break;
1181                         }
1182                 }
1183         }
1184
1185         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1186                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1187                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1188
1189                 if (rate > 110)
1190                         have_higher_than_11mbit = true;
1191
1192                 for (j = 0; j < sband->n_bitrates; j++) {
1193                         if (sband->bitrates[j].bitrate == rate) {
1194                                 rates |= BIT(j);
1195                                 if (is_basic)
1196                                         basic_rates |= BIT(j);
1197                                 break;
1198                         }
1199                 }
1200         }
1201
1202         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1203         sdata->vif.bss_conf.basic_rates = basic_rates;
1204
1205         /* cf. IEEE 802.11 9.2.12 */
1206         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1207             have_higher_than_11mbit)
1208                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1209         else
1210                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1211
1212         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1213                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1214                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1215
1216         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1217
1218         rate_control_rate_init(sta);
1219
1220         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1221                 set_sta_flags(sta, WLAN_STA_MFP);
1222
1223         if (elems.wmm_param)
1224                 set_sta_flags(sta, WLAN_STA_WME);
1225
1226         err = sta_info_insert(sta);
1227         sta = NULL;
1228         if (err) {
1229                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1230                        " the AP (error %d)\n", sdata->name, err);
1231                 return false;
1232         }
1233
1234         if (elems.wmm_param)
1235                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1236                                          elems.wmm_param_len);
1237         else
1238                 ieee80211_set_wmm_default(sdata);
1239
1240         local->oper_channel = wk->chan;
1241
1242         if (elems.ht_info_elem && elems.wmm_param &&
1243             (sdata->local->hw.queues >= 4) &&
1244             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1245                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1246                                                cbss->bssid, ap_ht_cap_flags);
1247
1248         /* set AID and assoc capability,
1249          * ieee80211_set_associated() will tell the driver */
1250         bss_conf->aid = aid;
1251         bss_conf->assoc_capability = capab_info;
1252         ieee80211_set_associated(sdata, cbss, changed);
1253
1254         /*
1255          * If we're using 4-addr mode, let the AP know that we're
1256          * doing so, so that it can create the STA VLAN on its side
1257          */
1258         if (ifmgd->use_4addr)
1259                 ieee80211_send_4addr_nullfunc(local, sdata);
1260
1261         /*
1262          * Start timer to probe the connection to the AP now.
1263          * Also start the timer that will detect beacon loss.
1264          */
1265         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1266         mod_beacon_timer(sdata);
1267
1268         return true;
1269 }
1270
1271
1272 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1273                                   struct ieee80211_mgmt *mgmt,
1274                                   size_t len,
1275                                   struct ieee80211_rx_status *rx_status,
1276                                   struct ieee802_11_elems *elems,
1277                                   bool beacon)
1278 {
1279         struct ieee80211_local *local = sdata->local;
1280         int freq;
1281         struct ieee80211_bss *bss;
1282         struct ieee80211_channel *channel;
1283         bool need_ps = false;
1284
1285         if (sdata->u.mgd.associated) {
1286                 bss = (void *)sdata->u.mgd.associated->priv;
1287                 /* not previously set so we may need to recalc */
1288                 need_ps = !bss->dtim_period;
1289         }
1290
1291         if (elems->ds_params && elems->ds_params_len == 1)
1292                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1293         else
1294                 freq = rx_status->freq;
1295
1296         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1297
1298         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1299                 return;
1300
1301         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1302                                         channel, beacon);
1303         if (bss)
1304                 ieee80211_rx_bss_put(local, bss);
1305
1306         if (!sdata->u.mgd.associated)
1307                 return;
1308
1309         if (need_ps) {
1310                 mutex_lock(&local->iflist_mtx);
1311                 ieee80211_recalc_ps(local, -1);
1312                 mutex_unlock(&local->iflist_mtx);
1313         }
1314
1315         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1316             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1317                                                         ETH_ALEN) == 0)) {
1318                 struct ieee80211_channel_sw_ie *sw_elem =
1319                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1320                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1321         }
1322 }
1323
1324
1325 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1326                                          struct sk_buff *skb)
1327 {
1328         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1329         struct ieee80211_if_managed *ifmgd;
1330         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1331         size_t baselen, len = skb->len;
1332         struct ieee802_11_elems elems;
1333
1334         ifmgd = &sdata->u.mgd;
1335
1336         ASSERT_MGD_MTX(ifmgd);
1337
1338         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1339                 return; /* ignore ProbeResp to foreign address */
1340
1341         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1342         if (baselen > len)
1343                 return;
1344
1345         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1346                                 &elems);
1347
1348         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1349
1350         if (ifmgd->associated &&
1351             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1352             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1353                             IEEE80211_STA_CONNECTION_POLL)) {
1354                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1355                                   IEEE80211_STA_BEACON_POLL);
1356                 mutex_lock(&sdata->local->iflist_mtx);
1357                 ieee80211_recalc_ps(sdata->local, -1);
1358                 mutex_unlock(&sdata->local->iflist_mtx);
1359
1360                 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1361                         return;
1362
1363                 /*
1364                  * We've received a probe response, but are not sure whether
1365                  * we have or will be receiving any beacons or data, so let's
1366                  * schedule the timers again, just in case.
1367                  */
1368                 mod_beacon_timer(sdata);
1369
1370                 mod_timer(&ifmgd->conn_mon_timer,
1371                           round_jiffies_up(jiffies +
1372                                            IEEE80211_CONNECTION_IDLE_TIME));
1373         }
1374 }
1375
1376 /*
1377  * This is the canonical list of information elements we care about,
1378  * the filter code also gives us all changes to the Microsoft OUI
1379  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1380  *
1381  * We implement beacon filtering in software since that means we can
1382  * avoid processing the frame here and in cfg80211, and userspace
1383  * will not be able to tell whether the hardware supports it or not.
1384  *
1385  * XXX: This list needs to be dynamic -- userspace needs to be able to
1386  *      add items it requires. It also needs to be able to tell us to
1387  *      look out for other vendor IEs.
1388  */
1389 static const u64 care_about_ies =
1390         (1ULL << WLAN_EID_COUNTRY) |
1391         (1ULL << WLAN_EID_ERP_INFO) |
1392         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1393         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1394         (1ULL << WLAN_EID_HT_CAPABILITY) |
1395         (1ULL << WLAN_EID_HT_INFORMATION);
1396
1397 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1398                                      struct ieee80211_mgmt *mgmt,
1399                                      size_t len,
1400                                      struct ieee80211_rx_status *rx_status)
1401 {
1402         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1403         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1404         size_t baselen;
1405         struct ieee802_11_elems elems;
1406         struct ieee80211_local *local = sdata->local;
1407         u32 changed = 0;
1408         bool erp_valid, directed_tim = false;
1409         u8 erp_value = 0;
1410         u32 ncrc;
1411         u8 *bssid;
1412
1413         ASSERT_MGD_MTX(ifmgd);
1414
1415         /* Process beacon from the current BSS */
1416         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1417         if (baselen > len)
1418                 return;
1419
1420         if (rx_status->freq != local->hw.conf.channel->center_freq)
1421                 return;
1422
1423         /*
1424          * We might have received a number of frames, among them a
1425          * disassoc frame and a beacon...
1426          */
1427         if (!ifmgd->associated)
1428                 return;
1429
1430         bssid = ifmgd->associated->bssid;
1431
1432         /*
1433          * And in theory even frames from a different AP we were just
1434          * associated to a split-second ago!
1435          */
1436         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1437                 return;
1438
1439         /* Track average RSSI from the Beacon frames of the current AP */
1440         ifmgd->last_beacon_signal = rx_status->signal;
1441         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1442                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1443                 ifmgd->ave_beacon_signal = rx_status->signal;
1444                 ifmgd->last_cqm_event_signal = 0;
1445         } else {
1446                 ifmgd->ave_beacon_signal =
1447                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1448                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1449                          ifmgd->ave_beacon_signal) / 16;
1450         }
1451         if (bss_conf->cqm_rssi_thold &&
1452             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1453                 int sig = ifmgd->ave_beacon_signal / 16;
1454                 int last_event = ifmgd->last_cqm_event_signal;
1455                 int thold = bss_conf->cqm_rssi_thold;
1456                 int hyst = bss_conf->cqm_rssi_hyst;
1457                 if (sig < thold &&
1458                     (last_event == 0 || sig < last_event - hyst)) {
1459                         ifmgd->last_cqm_event_signal = sig;
1460                         ieee80211_cqm_rssi_notify(
1461                                 &sdata->vif,
1462                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1463                                 GFP_KERNEL);
1464                 } else if (sig > thold &&
1465                            (last_event == 0 || sig > last_event + hyst)) {
1466                         ifmgd->last_cqm_event_signal = sig;
1467                         ieee80211_cqm_rssi_notify(
1468                                 &sdata->vif,
1469                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1470                                 GFP_KERNEL);
1471                 }
1472         }
1473
1474         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1475 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1476                 if (net_ratelimit()) {
1477                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1478                                "to a received beacon\n", sdata->name);
1479                 }
1480 #endif
1481                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1482                 mutex_lock(&local->iflist_mtx);
1483                 ieee80211_recalc_ps(local, -1);
1484                 mutex_unlock(&local->iflist_mtx);
1485         }
1486
1487         /*
1488          * Push the beacon loss detection into the future since
1489          * we are processing a beacon from the AP just now.
1490          */
1491         mod_beacon_timer(sdata);
1492
1493         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1494         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1495                                           len - baselen, &elems,
1496                                           care_about_ies, ncrc);
1497
1498         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1499                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1500                                                    ifmgd->aid);
1501
1502         if (ncrc != ifmgd->beacon_crc) {
1503                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1504                                       true);
1505
1506                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1507                                          elems.wmm_param_len);
1508         }
1509
1510         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1511                 if (directed_tim) {
1512                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1513                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1514                                 ieee80211_hw_config(local,
1515                                                     IEEE80211_CONF_CHANGE_PS);
1516                                 ieee80211_send_nullfunc(local, sdata, 0);
1517                         } else {
1518                                 local->pspolling = true;
1519
1520                                 /*
1521                                  * Here is assumed that the driver will be
1522                                  * able to send ps-poll frame and receive a
1523                                  * response even though power save mode is
1524                                  * enabled, but some drivers might require
1525                                  * to disable power save here. This needs
1526                                  * to be investigated.
1527                                  */
1528                                 ieee80211_send_pspoll(local, sdata);
1529                         }
1530                 }
1531         }
1532
1533         if (ncrc == ifmgd->beacon_crc)
1534                 return;
1535         ifmgd->beacon_crc = ncrc;
1536
1537         if (elems.erp_info && elems.erp_info_len >= 1) {
1538                 erp_valid = true;
1539                 erp_value = elems.erp_info[0];
1540         } else {
1541                 erp_valid = false;
1542         }
1543         changed |= ieee80211_handle_bss_capability(sdata,
1544                         le16_to_cpu(mgmt->u.beacon.capab_info),
1545                         erp_valid, erp_value);
1546
1547
1548         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1549             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1550                 struct sta_info *sta;
1551                 struct ieee80211_supported_band *sband;
1552                 u16 ap_ht_cap_flags;
1553
1554                 rcu_read_lock();
1555
1556                 sta = sta_info_get(sdata, bssid);
1557                 if (WARN_ON(!sta)) {
1558                         rcu_read_unlock();
1559                         return;
1560                 }
1561
1562                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1563
1564                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1565                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1566
1567                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1568
1569                 rcu_read_unlock();
1570
1571                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1572                                                bssid, ap_ht_cap_flags);
1573         }
1574
1575         /* Note: country IE parsing is done for us by cfg80211 */
1576         if (elems.country_elem) {
1577                 /* TODO: IBSS also needs this */
1578                 if (elems.pwr_constr_elem)
1579                         ieee80211_handle_pwr_constr(sdata,
1580                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1581                                 elems.pwr_constr_elem,
1582                                 elems.pwr_constr_elem_len);
1583         }
1584
1585         ieee80211_bss_info_change_notify(sdata, changed);
1586 }
1587
1588 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1589                                           struct sk_buff *skb)
1590 {
1591         struct ieee80211_local *local = sdata->local;
1592         struct ieee80211_mgmt *mgmt;
1593         u16 fc;
1594
1595         if (skb->len < 24)
1596                 return RX_DROP_MONITOR;
1597
1598         mgmt = (struct ieee80211_mgmt *) skb->data;
1599         fc = le16_to_cpu(mgmt->frame_control);
1600
1601         switch (fc & IEEE80211_FCTL_STYPE) {
1602         case IEEE80211_STYPE_PROBE_RESP:
1603         case IEEE80211_STYPE_BEACON:
1604         case IEEE80211_STYPE_DEAUTH:
1605         case IEEE80211_STYPE_DISASSOC:
1606         case IEEE80211_STYPE_ACTION:
1607                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1608                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1609                 return RX_QUEUED;
1610         }
1611
1612         return RX_DROP_MONITOR;
1613 }
1614
1615 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1616                                          struct sk_buff *skb)
1617 {
1618         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1619         struct ieee80211_rx_status *rx_status;
1620         struct ieee80211_mgmt *mgmt;
1621         enum rx_mgmt_action rma = RX_MGMT_NONE;
1622         u16 fc;
1623
1624         rx_status = (struct ieee80211_rx_status *) skb->cb;
1625         mgmt = (struct ieee80211_mgmt *) skb->data;
1626         fc = le16_to_cpu(mgmt->frame_control);
1627
1628         mutex_lock(&ifmgd->mtx);
1629
1630         if (ifmgd->associated &&
1631             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1632                 switch (fc & IEEE80211_FCTL_STYPE) {
1633                 case IEEE80211_STYPE_BEACON:
1634                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1635                                                  rx_status);
1636                         break;
1637                 case IEEE80211_STYPE_PROBE_RESP:
1638                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1639                         break;
1640                 case IEEE80211_STYPE_DEAUTH:
1641                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1642                         break;
1643                 case IEEE80211_STYPE_DISASSOC:
1644                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1645                         break;
1646                 case IEEE80211_STYPE_ACTION:
1647                         if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1648                                 break;
1649
1650                         ieee80211_sta_process_chanswitch(sdata,
1651                                         &mgmt->u.action.u.chan_switch.sw_elem,
1652                                         (void *)ifmgd->associated->priv);
1653                         break;
1654                 }
1655                 mutex_unlock(&ifmgd->mtx);
1656
1657                 switch (rma) {
1658                 case RX_MGMT_NONE:
1659                         /* no action */
1660                         break;
1661                 case RX_MGMT_CFG80211_DEAUTH:
1662                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1663                         break;
1664                 case RX_MGMT_CFG80211_DISASSOC:
1665                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1666                         break;
1667                 default:
1668                         WARN(1, "unexpected: %d", rma);
1669                 }
1670                 goto out;
1671         }
1672
1673         mutex_unlock(&ifmgd->mtx);
1674
1675         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1676             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1677                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1678
1679  out:
1680         kfree_skb(skb);
1681 }
1682
1683 static void ieee80211_sta_timer(unsigned long data)
1684 {
1685         struct ieee80211_sub_if_data *sdata =
1686                 (struct ieee80211_sub_if_data *) data;
1687         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1688         struct ieee80211_local *local = sdata->local;
1689
1690         if (local->quiescing) {
1691                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1692                 return;
1693         }
1694
1695         ieee80211_queue_work(&local->hw, &ifmgd->work);
1696 }
1697
1698 static void ieee80211_sta_work(struct work_struct *work)
1699 {
1700         struct ieee80211_sub_if_data *sdata =
1701                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1702         struct ieee80211_local *local = sdata->local;
1703         struct ieee80211_if_managed *ifmgd;
1704         struct sk_buff *skb;
1705
1706         if (!ieee80211_sdata_running(sdata))
1707                 return;
1708
1709         if (local->scanning)
1710                 return;
1711
1712         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1713                 return;
1714
1715         /*
1716          * ieee80211_queue_work() should have picked up most cases,
1717          * here we'll pick the the rest.
1718          */
1719         if (WARN(local->suspended, "STA MLME work scheduled while "
1720                  "going to suspend\n"))
1721                 return;
1722
1723         ifmgd = &sdata->u.mgd;
1724
1725         /* first process frames to avoid timing out while a frame is pending */
1726         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1727                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1728
1729         /* then process the rest of the work */
1730         mutex_lock(&ifmgd->mtx);
1731
1732         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1733                             IEEE80211_STA_CONNECTION_POLL) &&
1734             ifmgd->associated) {
1735                 u8 bssid[ETH_ALEN];
1736
1737                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1738                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1739                         run_again(ifmgd, ifmgd->probe_timeout);
1740
1741                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1742 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1743                         printk(KERN_DEBUG "No probe response from AP %pM"
1744                                 " after %dms, try %d\n", bssid,
1745                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1746                                 ifmgd->probe_send_count);
1747 #endif
1748                         ieee80211_mgd_probe_ap_send(sdata);
1749                 } else {
1750                         /*
1751                          * We actually lost the connection ... or did we?
1752                          * Let's make sure!
1753                          */
1754                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1755                                           IEEE80211_STA_BEACON_POLL);
1756                         printk(KERN_DEBUG "No probe response from AP %pM"
1757                                 " after %dms, disconnecting.\n",
1758                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1759                         ieee80211_set_disassoc(sdata, true);
1760                         ieee80211_recalc_idle(local);
1761                         mutex_unlock(&ifmgd->mtx);
1762                         /*
1763                          * must be outside lock due to cfg80211,
1764                          * but that's not a problem.
1765                          */
1766                         ieee80211_send_deauth_disassoc(sdata, bssid,
1767                                         IEEE80211_STYPE_DEAUTH,
1768                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1769                                         NULL, true);
1770                         mutex_lock(&ifmgd->mtx);
1771                 }
1772         }
1773
1774         mutex_unlock(&ifmgd->mtx);
1775 }
1776
1777 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1778 {
1779         struct ieee80211_sub_if_data *sdata =
1780                 (struct ieee80211_sub_if_data *) data;
1781         struct ieee80211_local *local = sdata->local;
1782
1783         if (local->quiescing)
1784                 return;
1785
1786         ieee80211_queue_work(&sdata->local->hw,
1787                              &sdata->u.mgd.beacon_connection_loss_work);
1788 }
1789
1790 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1791 {
1792         struct ieee80211_sub_if_data *sdata =
1793                 (struct ieee80211_sub_if_data *) data;
1794         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1795         struct ieee80211_local *local = sdata->local;
1796
1797         if (local->quiescing)
1798                 return;
1799
1800         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1801 }
1802
1803 static void ieee80211_sta_monitor_work(struct work_struct *work)
1804 {
1805         struct ieee80211_sub_if_data *sdata =
1806                 container_of(work, struct ieee80211_sub_if_data,
1807                              u.mgd.monitor_work);
1808
1809         ieee80211_mgd_probe_ap(sdata, false);
1810 }
1811
1812 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1813 {
1814         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1815                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1816                                         IEEE80211_STA_CONNECTION_POLL);
1817
1818                 /* let's probe the connection once */
1819                 ieee80211_queue_work(&sdata->local->hw,
1820                            &sdata->u.mgd.monitor_work);
1821                 /* and do all the other regular work too */
1822                 ieee80211_queue_work(&sdata->local->hw,
1823                            &sdata->u.mgd.work);
1824         }
1825 }
1826
1827 #ifdef CONFIG_PM
1828 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1829 {
1830         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1831
1832         /*
1833          * we need to use atomic bitops for the running bits
1834          * only because both timers might fire at the same
1835          * time -- the code here is properly synchronised.
1836          */
1837
1838         cancel_work_sync(&ifmgd->work);
1839         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1840         if (del_timer_sync(&ifmgd->timer))
1841                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1842
1843         cancel_work_sync(&ifmgd->chswitch_work);
1844         if (del_timer_sync(&ifmgd->chswitch_timer))
1845                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1846
1847         cancel_work_sync(&ifmgd->monitor_work);
1848         /* these will just be re-established on connection */
1849         del_timer_sync(&ifmgd->conn_mon_timer);
1850         del_timer_sync(&ifmgd->bcn_mon_timer);
1851 }
1852
1853 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1854 {
1855         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1856
1857         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1858                 add_timer(&ifmgd->timer);
1859         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1860                 add_timer(&ifmgd->chswitch_timer);
1861 }
1862 #endif
1863
1864 /* interface setup */
1865 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1866 {
1867         struct ieee80211_if_managed *ifmgd;
1868
1869         ifmgd = &sdata->u.mgd;
1870         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1871         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1872         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1873         INIT_WORK(&ifmgd->beacon_connection_loss_work,
1874                   ieee80211_beacon_connection_loss_work);
1875         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1876                     (unsigned long) sdata);
1877         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1878                     (unsigned long) sdata);
1879         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1880                     (unsigned long) sdata);
1881         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1882                     (unsigned long) sdata);
1883         skb_queue_head_init(&ifmgd->skb_queue);
1884
1885         ifmgd->flags = 0;
1886
1887         mutex_init(&ifmgd->mtx);
1888
1889         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1890                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1891         else
1892                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1893 }
1894
1895 /* scan finished notification */
1896 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1897 {
1898         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1899
1900         /* Restart STA timers */
1901         rcu_read_lock();
1902         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1903                 ieee80211_restart_sta_timer(sdata);
1904         rcu_read_unlock();
1905 }
1906
1907 int ieee80211_max_network_latency(struct notifier_block *nb,
1908                                   unsigned long data, void *dummy)
1909 {
1910         s32 latency_usec = (s32) data;
1911         struct ieee80211_local *local =
1912                 container_of(nb, struct ieee80211_local,
1913                              network_latency_notifier);
1914
1915         mutex_lock(&local->iflist_mtx);
1916         ieee80211_recalc_ps(local, latency_usec);
1917         mutex_unlock(&local->iflist_mtx);
1918
1919         return 0;
1920 }
1921
1922 /* config hooks */
1923 static enum work_done_result
1924 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1925                           struct sk_buff *skb)
1926 {
1927         if (!skb) {
1928                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1929                 return WORK_DONE_DESTROY;
1930         }
1931
1932         if (wk->type == IEEE80211_WORK_AUTH) {
1933                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1934                 return WORK_DONE_DESTROY;
1935         }
1936
1937         mutex_lock(&wk->sdata->u.mgd.mtx);
1938         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1939         mutex_unlock(&wk->sdata->u.mgd.mtx);
1940
1941         wk->type = IEEE80211_WORK_AUTH;
1942         wk->probe_auth.tries = 0;
1943         return WORK_DONE_REQUEUE;
1944 }
1945
1946 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1947                        struct cfg80211_auth_request *req)
1948 {
1949         const u8 *ssid;
1950         struct ieee80211_work *wk;
1951         u16 auth_alg;
1952
1953         if (req->local_state_change)
1954                 return 0; /* no need to update mac80211 state */
1955
1956         switch (req->auth_type) {
1957         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1958                 auth_alg = WLAN_AUTH_OPEN;
1959                 break;
1960         case NL80211_AUTHTYPE_SHARED_KEY:
1961                 auth_alg = WLAN_AUTH_SHARED_KEY;
1962                 break;
1963         case NL80211_AUTHTYPE_FT:
1964                 auth_alg = WLAN_AUTH_FT;
1965                 break;
1966         case NL80211_AUTHTYPE_NETWORK_EAP:
1967                 auth_alg = WLAN_AUTH_LEAP;
1968                 break;
1969         default:
1970                 return -EOPNOTSUPP;
1971         }
1972
1973         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1974         if (!wk)
1975                 return -ENOMEM;
1976
1977         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1978
1979         if (req->ie && req->ie_len) {
1980                 memcpy(wk->ie, req->ie, req->ie_len);
1981                 wk->ie_len = req->ie_len;
1982         }
1983
1984         if (req->key && req->key_len) {
1985                 wk->probe_auth.key_len = req->key_len;
1986                 wk->probe_auth.key_idx = req->key_idx;
1987                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1988         }
1989
1990         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1991         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1992         wk->probe_auth.ssid_len = ssid[1];
1993
1994         wk->probe_auth.algorithm = auth_alg;
1995         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1996
1997         /* if we already have a probe, don't probe again */
1998         if (req->bss->proberesp_ies)
1999                 wk->type = IEEE80211_WORK_AUTH;
2000         else
2001                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2002         wk->chan = req->bss->channel;
2003         wk->sdata = sdata;
2004         wk->done = ieee80211_probe_auth_done;
2005
2006         ieee80211_add_work(wk);
2007         return 0;
2008 }
2009
2010 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2011                                                   struct sk_buff *skb)
2012 {
2013         struct ieee80211_mgmt *mgmt;
2014         u16 status;
2015
2016         if (!skb) {
2017                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2018                 return WORK_DONE_DESTROY;
2019         }
2020
2021         mgmt = (void *)skb->data;
2022         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2023
2024         if (status == WLAN_STATUS_SUCCESS) {
2025                 mutex_lock(&wk->sdata->u.mgd.mtx);
2026                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2027                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2028                         /* oops -- internal error -- send timeout for now */
2029                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2030                                                     wk->filter_ta);
2031                         return WORK_DONE_DESTROY;
2032                 }
2033                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2034         }
2035
2036         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2037         return WORK_DONE_DESTROY;
2038 }
2039
2040 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2041                         struct cfg80211_assoc_request *req)
2042 {
2043         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2044         struct ieee80211_bss *bss = (void *)req->bss->priv;
2045         struct ieee80211_work *wk;
2046         const u8 *ssid;
2047         int i;
2048
2049         mutex_lock(&ifmgd->mtx);
2050         if (ifmgd->associated) {
2051                 if (!req->prev_bssid ||
2052                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2053                            ETH_ALEN)) {
2054                         /*
2055                          * We are already associated and the request was not a
2056                          * reassociation request from the current BSS, so
2057                          * reject it.
2058                          */
2059                         mutex_unlock(&ifmgd->mtx);
2060                         return -EALREADY;
2061                 }
2062
2063                 /* Trying to reassociate - clear previous association state */
2064                 ieee80211_set_disassoc(sdata, true);
2065         }
2066         mutex_unlock(&ifmgd->mtx);
2067
2068         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2069         if (!wk)
2070                 return -ENOMEM;
2071
2072         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2073         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2074
2075         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2076                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2077                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2078                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2079                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2080
2081
2082         if (req->ie && req->ie_len) {
2083                 memcpy(wk->ie, req->ie, req->ie_len);
2084                 wk->ie_len = req->ie_len;
2085         } else
2086                 wk->ie_len = 0;
2087
2088         wk->assoc.bss = req->bss;
2089
2090         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2091
2092         /* new association always uses requested smps mode */
2093         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2094                 if (ifmgd->powersave)
2095                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2096                 else
2097                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2098         } else
2099                 ifmgd->ap_smps = ifmgd->req_smps;
2100
2101         wk->assoc.smps = ifmgd->ap_smps;
2102         /*
2103          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2104          * We still associate in non-HT mode (11a/b/g) if any one of these
2105          * ciphers is configured as pairwise.
2106          * We can set this to true for non-11n hardware, that'll be checked
2107          * separately along with the peer capabilities.
2108          */
2109         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2110         wk->assoc.capability = req->bss->capability;
2111         wk->assoc.wmm_used = bss->wmm_used;
2112         wk->assoc.supp_rates = bss->supp_rates;
2113         wk->assoc.supp_rates_len = bss->supp_rates_len;
2114         wk->assoc.ht_information_ie =
2115                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2116
2117         if (bss->wmm_used && bss->uapsd_supported &&
2118             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2119                 wk->assoc.uapsd_used = true;
2120                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2121         } else {
2122                 wk->assoc.uapsd_used = false;
2123                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2124         }
2125
2126         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2127         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2128         wk->assoc.ssid_len = ssid[1];
2129
2130         if (req->prev_bssid)
2131                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2132
2133         wk->type = IEEE80211_WORK_ASSOC;
2134         wk->chan = req->bss->channel;
2135         wk->sdata = sdata;
2136         wk->done = ieee80211_assoc_done;
2137
2138         if (req->use_mfp) {
2139                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2140                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2141         } else {
2142                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2143                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2144         }
2145
2146         if (req->crypto.control_port)
2147                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2148         else
2149                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2150
2151         ieee80211_add_work(wk);
2152         return 0;
2153 }
2154
2155 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2156                          struct cfg80211_deauth_request *req,
2157                          void *cookie)
2158 {
2159         struct ieee80211_local *local = sdata->local;
2160         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2161         struct ieee80211_work *wk;
2162         const u8 *bssid = req->bss->bssid;
2163
2164         mutex_lock(&ifmgd->mtx);
2165
2166         if (ifmgd->associated == req->bss) {
2167                 bssid = req->bss->bssid;
2168                 ieee80211_set_disassoc(sdata, true);
2169                 mutex_unlock(&ifmgd->mtx);
2170         } else {
2171                 bool not_auth_yet = false;
2172
2173                 mutex_unlock(&ifmgd->mtx);
2174
2175                 mutex_lock(&local->work_mtx);
2176                 list_for_each_entry(wk, &local->work_list, list) {
2177                         if (wk->sdata != sdata)
2178                                 continue;
2179
2180                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2181                             wk->type != IEEE80211_WORK_AUTH)
2182                                 continue;
2183
2184                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2185                                 continue;
2186
2187                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2188                         list_del_rcu(&wk->list);
2189                         free_work(wk);
2190                         break;
2191                 }
2192                 mutex_unlock(&local->work_mtx);
2193
2194                 /*
2195                  * If somebody requests authentication and we haven't
2196                  * sent out an auth frame yet there's no need to send
2197                  * out a deauth frame either. If the state was PROBE,
2198                  * then this is the case. If it's AUTH we have sent a
2199                  * frame, and if it's IDLE we have completed the auth
2200                  * process already.
2201                  */
2202                 if (not_auth_yet) {
2203                         __cfg80211_auth_canceled(sdata->dev, bssid);
2204                         return 0;
2205                 }
2206         }
2207
2208         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2209                sdata->name, bssid, req->reason_code);
2210
2211         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2212                                        req->reason_code, cookie,
2213                                        !req->local_state_change);
2214
2215         ieee80211_recalc_idle(sdata->local);
2216
2217         return 0;
2218 }
2219
2220 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2221                            struct cfg80211_disassoc_request *req,
2222                            void *cookie)
2223 {
2224         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2225         u8 bssid[ETH_ALEN];
2226
2227         mutex_lock(&ifmgd->mtx);
2228
2229         /*
2230          * cfg80211 should catch this ... but it's racy since
2231          * we can receive a disassoc frame, process it, hand it
2232          * to cfg80211 while that's in a locked section already
2233          * trying to tell us that the user wants to disconnect.
2234          */
2235         if (ifmgd->associated != req->bss) {
2236                 mutex_unlock(&ifmgd->mtx);
2237                 return -ENOLINK;
2238         }
2239
2240         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2241                sdata->name, req->bss->bssid, req->reason_code);
2242
2243         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2244         ieee80211_set_disassoc(sdata, false);
2245
2246         mutex_unlock(&ifmgd->mtx);
2247
2248         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2249                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2250                         cookie, !req->local_state_change);
2251         sta_info_destroy_addr(sdata, bssid);
2252
2253         ieee80211_recalc_idle(sdata->local);
2254
2255         return 0;
2256 }
2257
2258 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2259                          struct ieee80211_channel *chan,
2260                          enum nl80211_channel_type channel_type,
2261                          const u8 *buf, size_t len, u64 *cookie)
2262 {
2263         struct ieee80211_local *local = sdata->local;
2264         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2265         struct sk_buff *skb;
2266
2267         /* Check that we are on the requested channel for transmission */
2268         if ((chan != local->tmp_channel ||
2269              channel_type != local->tmp_channel_type) &&
2270             (chan != local->oper_channel ||
2271              channel_type != local->_oper_channel_type))
2272                 return -EBUSY;
2273
2274         skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2275         if (!skb)
2276                 return -ENOMEM;
2277         skb_reserve(skb, local->hw.extra_tx_headroom);
2278
2279         memcpy(skb_put(skb, len), buf, len);
2280
2281         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2282                 IEEE80211_SKB_CB(skb)->flags |=
2283                         IEEE80211_TX_INTFL_DONT_ENCRYPT;
2284         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2285                 IEEE80211_TX_CTL_REQ_TX_STATUS;
2286         skb->dev = sdata->dev;
2287         ieee80211_tx_skb(sdata, skb);
2288
2289         *cookie = (unsigned long) skb;
2290         return 0;
2291 }
2292
2293 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2294                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2295                                gfp_t gfp)
2296 {
2297         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2298
2299         trace_api_cqm_rssi_notify(sdata, rssi_event);
2300
2301         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2302 }
2303 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);