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