net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/pm_qos_params.h>
  21 #include <linux/crc32.h>
  22 #include <net/mac80211.h>
  23 #include <asm/unaligned.h>
  24
  25 #include "ieee80211_i.h"
  26 #include "driver-ops.h"
  27 #include "rate.h"
  28 #include "led.h"
  29
  30 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  31 #define IEEE80211_AUTH_MAX_TRIES 3
  32 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  33 #define IEEE80211_ASSOC_MAX_TRIES 3
  34 #define IEEE80211_MAX_PROBE_TRIES 5
  35
  36 /*
  37  * beacon loss detection timeout
  38  * XXX: should depend on beacon interval
  39  */
  40 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
  41 /*
  42  * Time the connection can be idle before we probe
  43  * it to see if we can still talk to the AP.
  44  */
  45 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  46 /*
  47  * Time we wait for a probe response after sending
  48  * a probe request because of beacon loss or for
  49  * checking the connection still works.
  50  */
  51 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  52
  53 #define TMR_RUNNING_TIMER       0
  54 #define TMR_RUNNING_CHANSW      1
  55
  56 /*
  57  * All cfg80211 functions have to be called outside a locked
  58  * section so that they can acquire a lock themselves... This
  59  * is much simpler than queuing up things in cfg80211, but we
  60  * do need some indirection for that here.
  61  */
  62 enum rx_mgmt_action {
  63         /* no action required */
  64         RX_MGMT_NONE,
  65
  66         /* caller must call cfg80211_send_rx_auth() */
  67         RX_MGMT_CFG80211_AUTH,
  68
  69         /* caller must call cfg80211_send_rx_assoc() */
  70         RX_MGMT_CFG80211_ASSOC,
  71
  72         /* caller must call cfg80211_send_deauth() */
  73         RX_MGMT_CFG80211_DEAUTH,
  74
  75         /* caller must call cfg80211_send_disassoc() */
  76         RX_MGMT_CFG80211_DISASSOC,
  77
  78         /* caller must call cfg80211_auth_timeout() & free work */
  79         RX_MGMT_CFG80211_AUTH_TO,
  80
  81         /* caller must call cfg80211_assoc_timeout() & free work */
  82         RX_MGMT_CFG80211_ASSOC_TO,
  83 };
  84
  85 /* utils */
  86 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  87 {
  88         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  89 }
  90
  91 /*
  92  * We can have multiple work items (and connection probing)
  93  * scheduling this timer, but we need to take care to only
  94  * reschedule it when it should fire _earlier_ than it was
  95  * asked for before, or if it's not pending right now. This
  96  * function ensures that. Note that it then is required to
  97  * run this function for all timeouts after the first one
  98  * has happened -- the work that runs from this timer will
  99  * do that.
 100  */
 101 static void run_again(struct ieee80211_if_managed *ifmgd,
 102                              unsigned long timeout)
 103 {
 104         ASSERT_MGD_MTX(ifmgd);
 105
 106         if (!timer_pending(&ifmgd->timer) ||
 107             time_before(timeout, ifmgd->timer.expires))
 108                 mod_timer(&ifmgd->timer, timeout);
 109 }
 110
 111 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 112 {
 113         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 114                 return;
 115
 116         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 117                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 118 }
 119
 120 static int ecw2cw(int ecw)
 121 {
 122         return (1 << ecw) - 1;
 123 }
 124
 125 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
 126                                       struct ieee80211_supported_band *sband,
 127                                       u32 *rates)
 128 {
 129         int i, j, count;
 130         *rates = 0;
 131         count = 0;
 132         for (i = 0; i < bss->supp_rates_len; i++) {
 133                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
 134
 135                 for (j = 0; j < sband->n_bitrates; j++)
 136                         if (sband->bitrates[j].bitrate == rate) {
 137                                 *rates |= BIT(j);
 138                                 count++;
 139                                 break;
 140                         }
 141         }
 142
 143         return count;
 144 }
 145
 146 /*
 147  * ieee80211_enable_ht should be called only after the operating band
 148  * has been determined as ht configuration depends on the hw's
 149  * HT abilities for a specific band.
 150  */
 151 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 152                                struct ieee80211_ht_info *hti,
 153                                const u8 *bssid, u16 ap_ht_cap_flags)
 154 {
 155         struct ieee80211_local *local = sdata->local;
 156         struct ieee80211_supported_band *sband;
 157         struct sta_info *sta;
 158         u32 changed = 0;
 159         u16 ht_opmode;
 160         bool enable_ht = true, ht_changed;
 161         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 162
 163         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 164
 165         /* HT is not supported */
 166         if (!sband->ht_cap.ht_supported)
 167                 enable_ht = false;
 168
 169         /* check that channel matches the right operating channel */
 170         if (local->hw.conf.channel->center_freq !=
 171             ieee80211_channel_to_frequency(hti->control_chan))
 172                 enable_ht = false;
 173
 174         if (enable_ht) {
 175                 channel_type = NL80211_CHAN_HT20;
 176
 177                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 178                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 179                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 180                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 181                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 182                                 if (!(local->hw.conf.channel->flags &
 183                                     IEEE80211_CHAN_NO_HT40PLUS))
 184                                         channel_type = NL80211_CHAN_HT40PLUS;
 185                                 break;
 186                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 187                                 if (!(local->hw.conf.channel->flags &
 188                                     IEEE80211_CHAN_NO_HT40MINUS))
 189                                         channel_type = NL80211_CHAN_HT40MINUS;
 190                                 break;
 191                         }
 192                 }
 193         }
 194
 195         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 196                      channel_type != local->hw.conf.channel_type;
 197
 198         local->oper_channel_type = channel_type;
 199
 200         if (ht_changed) {
 201                 /* channel_type change automatically detected */
 202                 ieee80211_hw_config(local, 0);
 203
 204                 rcu_read_lock();
 205                 sta = sta_info_get(local, bssid);
 206                 if (sta)
 207                         rate_control_rate_update(local, sband, sta,
 208                                                  IEEE80211_RC_HT_CHANGED);
 209                 rcu_read_unlock();
 210         }
 211
 212         /* disable HT */
 213         if (!enable_ht)
 214                 return 0;
 215
 216         ht_opmode = le16_to_cpu(hti->operation_mode);
 217
 218         /* if bss configuration changed store the new one */
 219         if (!sdata->ht_opmode_valid ||
 220             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 221                 changed |= BSS_CHANGED_HT;
 222                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 223                 sdata->ht_opmode_valid = true;
 224         }
 225
 226         return changed;
 227 }
 228
 229 /* frame sending functions */
 230
 231 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
 232                                  struct ieee80211_mgd_work *wk)
 233 {
 234         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 235         struct ieee80211_local *local = sdata->local;
 236         struct sk_buff *skb;
 237         struct ieee80211_mgmt *mgmt;
 238         u8 *pos;
 239         const u8 *ies, *ht_ie;
 240         int i, len, count, rates_len, supp_rates_len;
 241         u16 capab;
 242         int wmm = 0;
 243         struct ieee80211_supported_band *sband;
 244         u32 rates = 0;
 245
 246         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 247                             sizeof(*mgmt) + 200 + wk->ie_len +
 248                             wk->ssid_len);
 249         if (!skb) {
 250                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 251                        "frame\n", sdata->dev->name);
 252                 return;
 253         }
 254         skb_reserve(skb, local->hw.extra_tx_headroom);
 255
 256         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 257
 258         capab = ifmgd->capab;
 259
 260         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 261                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 262                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 263                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 264                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 265         }
 266
 267         if (wk->bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
 268                 capab |= WLAN_CAPABILITY_PRIVACY;
 269         if (wk->bss->wmm_used)
 270                 wmm = 1;
 271
 272         /* get all rates supported by the device and the AP as
 273          * some APs don't like getting a superset of their rates
 274          * in the association request (e.g. D-Link DAP 1353 in
 275          * b-only mode) */
 276         rates_len = ieee80211_compatible_rates(wk->bss, sband, &rates);
 277
 278         if ((wk->bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 279             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 280                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 281
 282         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 283         memset(mgmt, 0, 24);
 284         memcpy(mgmt->da, wk->bss->cbss.bssid, ETH_ALEN);
 285         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 286         memcpy(mgmt->bssid, wk->bss->cbss.bssid, ETH_ALEN);
 287
 288         if (!is_zero_ether_addr(wk->prev_bssid)) {
 289                 skb_put(skb, 10);
 290                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 291                                                   IEEE80211_STYPE_REASSOC_REQ);
 292                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 293                 mgmt->u.reassoc_req.listen_interval =
 294                                 cpu_to_le16(local->hw.conf.listen_interval);
 295                 memcpy(mgmt->u.reassoc_req.current_ap, wk->prev_bssid,
 296                        ETH_ALEN);
 297         } else {
 298                 skb_put(skb, 4);
 299                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 300                                                   IEEE80211_STYPE_ASSOC_REQ);
 301                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 302                 mgmt->u.assoc_req.listen_interval =
 303                                 cpu_to_le16(local->hw.conf.listen_interval);
 304         }
 305
 306         /* SSID */
 307         ies = pos = skb_put(skb, 2 + wk->ssid_len);
 308         *pos++ = WLAN_EID_SSID;
 309         *pos++ = wk->ssid_len;
 310         memcpy(pos, wk->ssid, wk->ssid_len);
 311
 312         /* add all rates which were marked to be used above */
 313         supp_rates_len = rates_len;
 314         if (supp_rates_len > 8)
 315                 supp_rates_len = 8;
 316
 317         len = sband->n_bitrates;
 318         pos = skb_put(skb, supp_rates_len + 2);
 319         *pos++ = WLAN_EID_SUPP_RATES;
 320         *pos++ = supp_rates_len;
 321
 322         count = 0;
 323         for (i = 0; i < sband->n_bitrates; i++) {
 324                 if (BIT(i) & rates) {
 325                         int rate = sband->bitrates[i].bitrate;
 326                         *pos++ = (u8) (rate / 5);
 327                         if (++count == 8)
 328                                 break;
 329                 }
 330         }
 331
 332         if (rates_len > count) {
 333                 pos = skb_put(skb, rates_len - count + 2);
 334                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 335                 *pos++ = rates_len - count;
 336
 337                 for (i++; i < sband->n_bitrates; i++) {
 338                         if (BIT(i) & rates) {
 339                                 int rate = sband->bitrates[i].bitrate;
 340                                 *pos++ = (u8) (rate / 5);
 341                         }
 342                 }
 343         }
 344
 345         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 346                 /* 1. power capabilities */
 347                 pos = skb_put(skb, 4);
 348                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 349                 *pos++ = 2;
 350                 *pos++ = 0; /* min tx power */
 351                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 352
 353                 /* 2. supported channels */
 354                 /* TODO: get this in reg domain format */
 355                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 356                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 357                 *pos++ = 2 * sband->n_channels;
 358                 for (i = 0; i < sband->n_channels; i++) {
 359                         *pos++ = ieee80211_frequency_to_channel(
 360                                         sband->channels[i].center_freq);
 361                         *pos++ = 1; /* one channel in the subband*/
 362                 }
 363         }
 364
 365         if (wk->ie_len && wk->ie) {
 366                 pos = skb_put(skb, wk->ie_len);
 367                 memcpy(pos, wk->ie, wk->ie_len);
 368         }
 369
 370         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
 371                 pos = skb_put(skb, 9);
 372                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 373                 *pos++ = 7; /* len */
 374                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 375                 *pos++ = 0x50;
 376                 *pos++ = 0xf2;
 377                 *pos++ = 2; /* WME */
 378                 *pos++ = 0; /* WME info */
 379                 *pos++ = 1; /* WME ver */
 380                 *pos++ = 0;
 381         }
 382
 383         /* wmm support is a must to HT */
 384         /*
 385          * IEEE802.11n does not allow TKIP/WEP as pairwise
 386          * ciphers in HT mode. We still associate in non-ht
 387          * mode (11a/b/g) if any one of these ciphers is
 388          * configured as pairwise.
 389          */
 390         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
 391             sband->ht_cap.ht_supported &&
 392             (ht_ie = ieee80211_bss_get_ie(&wk->bss->cbss, WLAN_EID_HT_INFORMATION)) &&
 393             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 394             (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))) {
 395                 struct ieee80211_ht_info *ht_info =
 396                         (struct ieee80211_ht_info *)(ht_ie + 2);
 397                 u16 cap = sband->ht_cap.cap;
 398                 __le16 tmp;
 399                 u32 flags = local->hw.conf.channel->flags;
 400
 401                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 402                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 403                         if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 404                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 405                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 406                         }
 407                         break;
 408                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 409                         if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 410                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 411                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 412                         }
 413                         break;
 414                 }
 415
 416                 tmp = cpu_to_le16(cap);
 417                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 418                 *pos++ = WLAN_EID_HT_CAPABILITY;
 419                 *pos++ = sizeof(struct ieee80211_ht_cap);
 420                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 421                 memcpy(pos, &tmp, sizeof(u16));
 422                 pos += sizeof(u16);
 423                 /* TODO: needs a define here for << 2 */
 424                 *pos++ = sband->ht_cap.ampdu_factor |
 425                          (sband->ht_cap.ampdu_density << 2);
 426                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 427         }
 428
 429         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 430         ieee80211_tx_skb(sdata, skb);
 431 }
 432
 433
 434 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 435                                            const u8 *bssid, u16 stype, u16 reason,
 436                                            void *cookie)
 437 {
 438         struct ieee80211_local *local = sdata->local;
 439         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 440         struct sk_buff *skb;
 441         struct ieee80211_mgmt *mgmt;
 442
 443         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 444         if (!skb) {
 445                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 446                        "deauth/disassoc frame\n", sdata->dev->name);
 447                 return;
 448         }
 449         skb_reserve(skb, local->hw.extra_tx_headroom);
 450
 451         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 452         memset(mgmt, 0, 24);
 453         memcpy(mgmt->da, bssid, ETH_ALEN);
 454         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 455         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 456         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 457         skb_put(skb, 2);
 458         /* u.deauth.reason_code == u.disassoc.reason_code */
 459         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 460
 461         if (stype == IEEE80211_STYPE_DEAUTH)
 462                 if (cookie)
 463                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 464                 else
 465                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 466         else
 467                 if (cookie)
 468                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 469                 else
 470                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 471         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 472                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 473         ieee80211_tx_skb(sdata, skb);
 474 }
 475
 476 void ieee80211_send_pspoll(struct ieee80211_local *local,
 477                            struct ieee80211_sub_if_data *sdata)
 478 {
 479         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 480         struct ieee80211_pspoll *pspoll;
 481         struct sk_buff *skb;
 482         u16 fc;
 483
 484         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 485         if (!skb) {
 486                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 487                        "pspoll frame\n", sdata->dev->name);
 488                 return;
 489         }
 490         skb_reserve(skb, local->hw.extra_tx_headroom);
 491
 492         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 493         memset(pspoll, 0, sizeof(*pspoll));
 494         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 495         pspoll->frame_control = cpu_to_le16(fc);
 496         pspoll->aid = cpu_to_le16(ifmgd->aid);
 497
 498         /* aid in PS-Poll has its two MSBs each set to 1 */
 499         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 500
 501         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
 502         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
 503
 504         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 505         ieee80211_tx_skb(sdata, skb);
 506 }
 507
 508 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 509                              struct ieee80211_sub_if_data *sdata,
 510                              int powersave)
 511 {
 512         struct sk_buff *skb;
 513         struct ieee80211_hdr *nullfunc;
 514         __le16 fc;
 515
 516         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 517                 return;
 518
 519         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
 520         if (!skb) {
 521                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
 522                        "frame\n", sdata->dev->name);
 523                 return;
 524         }
 525         skb_reserve(skb, local->hw.extra_tx_headroom);
 526
 527         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
 528         memset(nullfunc, 0, 24);
 529         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 530                          IEEE80211_FCTL_TODS);
 531         if (powersave)
 532                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
 533         nullfunc->frame_control = fc;
 534         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 535         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
 536         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 537
 538         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 539         ieee80211_tx_skb(sdata, skb);
 540 }
 541
 542 /* spectrum management related things */
 543 static void ieee80211_chswitch_work(struct work_struct *work)
 544 {
 545         struct ieee80211_sub_if_data *sdata =
 546                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 547         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 548
 549         if (!netif_running(sdata->dev))
 550                 return;
 551
 552         mutex_lock(&ifmgd->mtx);
 553         if (!ifmgd->associated)
 554                 goto out;
 555
 556         sdata->local->oper_channel = sdata->local->csa_channel;
 557         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
 558
 559         /* XXX: shouldn't really modify cfg80211-owned data! */
 560         ifmgd->associated->cbss.channel = sdata->local->oper_channel;
 561
 562         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 563                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 564  out:
 565         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 566         mutex_unlock(&ifmgd->mtx);
 567 }
 568
 569 static void ieee80211_chswitch_timer(unsigned long data)
 570 {
 571         struct ieee80211_sub_if_data *sdata =
 572                 (struct ieee80211_sub_if_data *) data;
 573         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 574
 575         if (sdata->local->quiescing) {
 576                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 577                 return;
 578         }
 579
 580         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 581 }
 582
 583 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 584                                       struct ieee80211_channel_sw_ie *sw_elem,
 585                                       struct ieee80211_bss *bss)
 586 {
 587         struct ieee80211_channel *new_ch;
 588         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 589         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 590
 591         ASSERT_MGD_MTX(ifmgd);
 592
 593         if (!ifmgd->associated)
 594                 return;
 595
 596         if (sdata->local->scanning)
 597                 return;
 598
 599         /* Disregard subsequent beacons if we are already running a timer
 600            processing a CSA */
 601
 602         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 603                 return;
 604
 605         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 606         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 607                 return;
 608
 609         sdata->local->csa_channel = new_ch;
 610
 611         if (sw_elem->count <= 1) {
 612                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 613         } else {
 614                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 615                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 616                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 617                 mod_timer(&ifmgd->chswitch_timer,
 618                           jiffies +
 619                           msecs_to_jiffies(sw_elem->count *
 620                                            bss->cbss.beacon_interval));
 621         }
 622 }
 623
 624 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 625                                         u16 capab_info, u8 *pwr_constr_elem,
 626                                         u8 pwr_constr_elem_len)
 627 {
 628         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 629
 630         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 631                 return;
 632
 633         /* Power constraint IE length should be 1 octet */
 634         if (pwr_constr_elem_len != 1)
 635                 return;
 636
 637         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 638             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 639                 sdata->local->power_constr_level = *pwr_constr_elem;
 640                 ieee80211_hw_config(sdata->local, 0);
 641         }
 642 }
 643
 644 /* powersave */
 645 static void ieee80211_enable_ps(struct ieee80211_local *local,
 646                                 struct ieee80211_sub_if_data *sdata)
 647 {
 648         struct ieee80211_conf *conf = &local->hw.conf;
 649
 650         /*
 651          * If we are scanning right now then the parameters will
 652          * take effect when scan finishes.
 653          */
 654         if (local->scanning)
 655                 return;
 656
 657         if (conf->dynamic_ps_timeout > 0 &&
 658             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 659                 mod_timer(&local->dynamic_ps_timer, jiffies +
 660                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 661         } else {
 662                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 663                         ieee80211_send_nullfunc(local, sdata, 1);
 664                 conf->flags |= IEEE80211_CONF_PS;
 665                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 666         }
 667 }
 668
 669 static void ieee80211_change_ps(struct ieee80211_local *local)
 670 {
 671         struct ieee80211_conf *conf = &local->hw.conf;
 672
 673         if (local->ps_sdata) {
 674                 ieee80211_enable_ps(local, local->ps_sdata);
 675         } else if (conf->flags & IEEE80211_CONF_PS) {
 676                 conf->flags &= ~IEEE80211_CONF_PS;
 677                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 678                 del_timer_sync(&local->dynamic_ps_timer);
 679                 cancel_work_sync(&local->dynamic_ps_enable_work);
 680         }
 681 }
 682
 683 /* need to hold RTNL or interface lock */
 684 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 685 {
 686         struct ieee80211_sub_if_data *sdata, *found = NULL;
 687         int count = 0;
 688
 689         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 690                 local->ps_sdata = NULL;
 691                 return;
 692         }
 693
 694         list_for_each_entry(sdata, &local->interfaces, list) {
 695                 if (!netif_running(sdata->dev))
 696                         continue;
 697                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 698                         continue;
 699                 found = sdata;
 700                 count++;
 701         }
 702
 703         if (count == 1 && found->u.mgd.powersave &&
 704             found->u.mgd.associated && list_empty(&found->u.mgd.work_list) &&
 705             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 706                                     IEEE80211_STA_CONNECTION_POLL))) {
 707                 s32 beaconint_us;
 708
 709                 if (latency < 0)
 710                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 711
 712                 beaconint_us = ieee80211_tu_to_usec(
 713                                         found->vif.bss_conf.beacon_int);
 714
 715                 if (beaconint_us > latency) {
 716                         local->ps_sdata = NULL;
 717                 } else {
 718                         u8 dtimper = found->vif.bss_conf.dtim_period;
 719                         int maxslp = 1;
 720
 721                         if (dtimper > 1)
 722                                 maxslp = min_t(int, dtimper,
 723                                                     latency / beaconint_us);
 724
 725                         local->hw.conf.max_sleep_period = maxslp;
 726                         local->ps_sdata = found;
 727                 }
 728         } else {
 729                 local->ps_sdata = NULL;
 730         }
 731
 732         ieee80211_change_ps(local);
 733 }
 734
 735 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 736 {
 737         struct ieee80211_local *local =
 738                 container_of(work, struct ieee80211_local,
 739                              dynamic_ps_disable_work);
 740
 741         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 742                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 743                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 744         }
 745
 746         ieee80211_wake_queues_by_reason(&local->hw,
 747                                         IEEE80211_QUEUE_STOP_REASON_PS);
 748 }
 749
 750 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 751 {
 752         struct ieee80211_local *local =
 753                 container_of(work, struct ieee80211_local,
 754                              dynamic_ps_enable_work);
 755         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 756
 757         /* can only happen when PS was just disabled anyway */
 758         if (!sdata)
 759                 return;
 760
 761         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 762                 return;
 763
 764         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 765                 ieee80211_send_nullfunc(local, sdata, 1);
 766
 767         local->hw.conf.flags |= IEEE80211_CONF_PS;
 768         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 769 }
 770
 771 void ieee80211_dynamic_ps_timer(unsigned long data)
 772 {
 773         struct ieee80211_local *local = (void *) data;
 774
 775         if (local->quiescing || local->suspended)
 776                 return;
 777
 778         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 779 }
 780
 781 /* MLME */
 782 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 783                                      struct ieee80211_if_managed *ifmgd,
 784                                      u8 *wmm_param, size_t wmm_param_len)
 785 {
 786         struct ieee80211_tx_queue_params params;
 787         size_t left;
 788         int count;
 789         u8 *pos;
 790
 791         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
 792                 return;
 793
 794         if (!wmm_param)
 795                 return;
 796
 797         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 798                 return;
 799         count = wmm_param[6] & 0x0f;
 800         if (count == ifmgd->wmm_last_param_set)
 801                 return;
 802         ifmgd->wmm_last_param_set = count;
 803
 804         pos = wmm_param + 8;
 805         left = wmm_param_len - 8;
 806
 807         memset(&params, 0, sizeof(params));
 808
 809         local->wmm_acm = 0;
 810         for (; left >= 4; left -= 4, pos += 4) {
 811                 int aci = (pos[0] >> 5) & 0x03;
 812                 int acm = (pos[0] >> 4) & 0x01;
 813                 int queue;
 814
 815                 switch (aci) {
 816                 case 1: /* AC_BK */
 817                         queue = 3;
 818                         if (acm)
 819                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 820                         break;
 821                 case 2: /* AC_VI */
 822                         queue = 1;
 823                         if (acm)
 824                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 825                         break;
 826                 case 3: /* AC_VO */
 827                         queue = 0;
 828                         if (acm)
 829                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 830                         break;
 831                 case 0: /* AC_BE */
 832                 default:
 833                         queue = 2;
 834                         if (acm)
 835                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 836                         break;
 837                 }
 838
 839                 params.aifs = pos[0] & 0x0f;
 840                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 841                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 842                 params.txop = get_unaligned_le16(pos + 2);
 843 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 844                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 845                        "cWmin=%d cWmax=%d txop=%d\n",
 846                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 847                        params.aifs, params.cw_min, params.cw_max, params.txop);
 848 #endif
 849                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
 850                         printk(KERN_DEBUG "%s: failed to set TX queue "
 851                                "parameters for queue %d\n",
 852                                wiphy_name(local->hw.wiphy), queue);
 853         }
 854 }
 855
 856 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 857                                            u16 capab, bool erp_valid, u8 erp)
 858 {
 859         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 860         u32 changed = 0;
 861         bool use_protection;
 862         bool use_short_preamble;
 863         bool use_short_slot;
 864
 865         if (erp_valid) {
 866                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 867                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 868         } else {
 869                 use_protection = false;
 870                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 871         }
 872
 873         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 874
 875         if (use_protection != bss_conf->use_cts_prot) {
 876                 bss_conf->use_cts_prot = use_protection;
 877                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 878         }
 879
 880         if (use_short_preamble != bss_conf->use_short_preamble) {
 881                 bss_conf->use_short_preamble = use_short_preamble;
 882                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 883         }
 884
 885         if (use_short_slot != bss_conf->use_short_slot) {
 886                 bss_conf->use_short_slot = use_short_slot;
 887                 changed |= BSS_CHANGED_ERP_SLOT;
 888         }
 889
 890         return changed;
 891 }
 892
 893 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 894                                      struct ieee80211_mgd_work *wk,
 895                                      u32 bss_info_changed)
 896 {
 897         struct ieee80211_local *local = sdata->local;
 898         struct ieee80211_bss *bss = wk->bss;
 899
 900         bss_info_changed |= BSS_CHANGED_ASSOC;
 901         /* set timing information */
 902         sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 903         sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 904         sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 905
 906         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 907         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 908                 bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 909
 910         sdata->u.mgd.associated = bss;
 911         sdata->u.mgd.old_associate_work = wk;
 912         memcpy(sdata->u.mgd.bssid, bss->cbss.bssid, ETH_ALEN);
 913
 914         /* just to be sure */
 915         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 916                                 IEEE80211_STA_BEACON_POLL);
 917
 918         /*
 919          * Always handle WMM once after association regardless
 920          * of the first value the AP uses. Setting -1 here has
 921          * that effect because the AP values is an unsigned
 922          * 4-bit value.
 923          */
 924         sdata->u.mgd.wmm_last_param_set = -1;
 925
 926         ieee80211_led_assoc(local, 1);
 927
 928         sdata->vif.bss_conf.assoc = 1;
 929         /*
 930          * For now just always ask the driver to update the basic rateset
 931          * when we have associated, we aren't checking whether it actually
 932          * changed or not.
 933          */
 934         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 935
 936         /* And the BSSID changed - we're associated now */
 937         bss_info_changed |= BSS_CHANGED_BSSID;
 938
 939         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 940
 941         mutex_lock(&local->iflist_mtx);
 942         ieee80211_recalc_ps(local, -1);
 943         mutex_unlock(&local->iflist_mtx);
 944
 945         netif_start_queue(sdata->dev);
 946         netif_carrier_on(sdata->dev);
 947 }
 948
 949 static enum rx_mgmt_action __must_check
 950 ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
 951                        struct ieee80211_mgd_work *wk)
 952 {
 953         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 954         struct ieee80211_local *local = sdata->local;
 955
 956         wk->tries++;
 957         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
 958                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 959                        sdata->dev->name, wk->bss->cbss.bssid);
 960
 961                 /*
 962                  * Most likely AP is not in the range so remove the
 963                  * bss struct for that AP.
 964                  */
 965                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
 966
 967                 /*
 968                  * We might have a pending scan which had no chance to run yet
 969                  * due to work needing to be done. Hence, queue the STAs work
 970                  * again for that.
 971                  */
 972                 ieee80211_queue_work(&local->hw, &ifmgd->work);
 973                 return RX_MGMT_CFG80211_AUTH_TO;
 974         }
 975
 976         printk(KERN_DEBUG "%s: direct probe to AP %pM (try %d)\n",
 977                         sdata->dev->name, wk->bss->cbss.bssid,
 978                         wk->tries);
 979
 980         /*
 981          * Direct probe is sent to broadcast address as some APs
 982          * will not answer to direct packet in unassociated state.
 983          */
 984         ieee80211_send_probe_req(sdata, NULL, wk->ssid, wk->ssid_len, NULL, 0);
 985
 986         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
 987         run_again(ifmgd, wk->timeout);
 988
 989         return RX_MGMT_NONE;
 990 }
 991
 992
 993 static enum rx_mgmt_action __must_check
 994 ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
 995                        struct ieee80211_mgd_work *wk)
 996 {
 997         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 998         struct ieee80211_local *local = sdata->local;
 999
1000         wk->tries++;
1001         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
1002                 printk(KERN_DEBUG "%s: authentication with AP %pM"
1003                        " timed out\n",
1004                        sdata->dev->name, wk->bss->cbss.bssid);
1005
1006                 /*
1007                  * Most likely AP is not in the range so remove the
1008                  * bss struct for that AP.
1009                  */
1010                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1011
1012                 /*
1013                  * We might have a pending scan which had no chance to run yet
1014                  * due to work needing to be done. Hence, queue the STAs work
1015                  * again for that.
1016                  */
1017                 ieee80211_queue_work(&local->hw, &ifmgd->work);
1018                 return RX_MGMT_CFG80211_AUTH_TO;
1019         }
1020
1021         printk(KERN_DEBUG "%s: authenticate with AP %pM (try %d)\n",
1022                sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1023
1024         ieee80211_send_auth(sdata, 1, wk->auth_alg, wk->ie, wk->ie_len,
1025                             wk->bss->cbss.bssid, NULL, 0, 0);
1026         wk->auth_transaction = 2;
1027
1028         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
1029         run_again(ifmgd, wk->timeout);
1030
1031         return RX_MGMT_NONE;
1032 }
1033
1034 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1035                                    bool deauth)
1036 {
1037         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1038         struct ieee80211_local *local = sdata->local;
1039         struct sta_info *sta;
1040         u32 changed = 0, config_changed = 0;
1041         u8 bssid[ETH_ALEN];
1042
1043         ASSERT_MGD_MTX(ifmgd);
1044
1045         if (WARN_ON(!ifmgd->associated))
1046                 return;
1047
1048         memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
1049
1050         ifmgd->associated = NULL;
1051         memset(ifmgd->bssid, 0, ETH_ALEN);
1052
1053         if (deauth) {
1054                 kfree(ifmgd->old_associate_work);
1055                 ifmgd->old_associate_work = NULL;
1056         } else {
1057                 struct ieee80211_mgd_work *wk = ifmgd->old_associate_work;
1058
1059                 wk->state = IEEE80211_MGD_STATE_IDLE;
1060                 list_add(&wk->list, &ifmgd->work_list);
1061         }
1062
1063         /*
1064          * we need to commit the associated = NULL change because the
1065          * scan code uses that to determine whether this iface should
1066          * go to/wake up from powersave or not -- and could otherwise
1067          * wake the queues erroneously.
1068          */
1069         smp_mb();
1070
1071         /*
1072          * Thus, we can only afterwards stop the queues -- to account
1073          * for the case where another CPU is finishing a scan at this
1074          * time -- we don't want the scan code to enable queues.
1075          */
1076
1077         netif_stop_queue(sdata->dev);
1078         netif_carrier_off(sdata->dev);
1079
1080         rcu_read_lock();
1081         sta = sta_info_get(local, bssid);
1082         if (sta)
1083                 ieee80211_sta_tear_down_BA_sessions(sta);
1084         rcu_read_unlock();
1085
1086         changed |= ieee80211_reset_erp_info(sdata);
1087
1088         ieee80211_led_assoc(local, 0);
1089         changed |= BSS_CHANGED_ASSOC;
1090         sdata->vif.bss_conf.assoc = false;
1091
1092         ieee80211_set_wmm_default(sdata);
1093
1094         /* channel(_type) changes are handled by ieee80211_hw_config */
1095         local->oper_channel_type = NL80211_CHAN_NO_HT;
1096
1097         /* on the next assoc, re-program HT parameters */
1098         sdata->ht_opmode_valid = false;
1099
1100         local->power_constr_level = 0;
1101
1102         del_timer_sync(&local->dynamic_ps_timer);
1103         cancel_work_sync(&local->dynamic_ps_enable_work);
1104
1105         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1106                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1107                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1108         }
1109
1110         ieee80211_hw_config(local, config_changed);
1111
1112         /* And the BSSID changed -- not very interesting here */
1113         changed |= BSS_CHANGED_BSSID;
1114         ieee80211_bss_info_change_notify(sdata, changed);
1115
1116         rcu_read_lock();
1117
1118         sta = sta_info_get(local, bssid);
1119         if (!sta) {
1120                 rcu_read_unlock();
1121                 return;
1122         }
1123
1124         sta_info_unlink(&sta);
1125
1126         rcu_read_unlock();
1127
1128         sta_info_destroy(sta);
1129 }
1130
1131 static enum rx_mgmt_action __must_check
1132 ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1133                     struct ieee80211_mgd_work *wk)
1134 {
1135         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1136         struct ieee80211_local *local = sdata->local;
1137
1138         wk->tries++;
1139         if (wk->tries > IEEE80211_ASSOC_MAX_TRIES) {
1140                 printk(KERN_DEBUG "%s: association with AP %pM"
1141                        " timed out\n",
1142                        sdata->dev->name, wk->bss->cbss.bssid);
1143
1144                 /*
1145                  * Most likely AP is not in the range so remove the
1146                  * bss struct for that AP.
1147                  */
1148                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1149
1150                 /*
1151                  * We might have a pending scan which had no chance to run yet
1152                  * due to work needing to be done. Hence, queue the STAs work
1153                  * again for that.
1154                  */
1155                 ieee80211_queue_work(&local->hw, &ifmgd->work);
1156                 return RX_MGMT_CFG80211_ASSOC_TO;
1157         }
1158
1159         printk(KERN_DEBUG "%s: associate with AP %pM (try %d)\n",
1160                sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1161         ieee80211_send_assoc(sdata, wk);
1162
1163         wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
1164         run_again(ifmgd, wk->timeout);
1165
1166         return RX_MGMT_NONE;
1167 }
1168
1169 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1170                              struct ieee80211_hdr *hdr)
1171 {
1172         /*
1173          * We can postpone the mgd.timer whenever receiving unicast frames
1174          * from AP because we know that the connection is working both ways
1175          * at that time. But multicast frames (and hence also beacons) must
1176          * be ignored here, because we need to trigger the timer during
1177          * data idle periods for sending the periodic probe request to the
1178          * AP we're connected to.
1179          */
1180         if (is_multicast_ether_addr(hdr->addr1))
1181                 return;
1182
1183         mod_timer(&sdata->u.mgd.conn_mon_timer,
1184                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1185 }
1186
1187 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1188 {
1189         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1190         const u8 *ssid;
1191
1192         ssid = ieee80211_bss_get_ie(&ifmgd->associated->cbss, WLAN_EID_SSID);
1193         ieee80211_send_probe_req(sdata, ifmgd->associated->cbss.bssid,
1194                                  ssid + 2, ssid[1], NULL, 0);
1195
1196         ifmgd->probe_send_count++;
1197         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1198         run_again(ifmgd, ifmgd->probe_timeout);
1199 }
1200
1201 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1202                                    bool beacon)
1203 {
1204         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1205         bool already = false;
1206
1207         if (!netif_running(sdata->dev))
1208                 return;
1209
1210         if (sdata->local->scanning)
1211                 return;
1212
1213         mutex_lock(&ifmgd->mtx);
1214
1215         if (!ifmgd->associated)
1216                 goto out;
1217
1218 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1219         if (beacon && net_ratelimit())
1220                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1221                        "- sending probe request\n", sdata->dev->name);
1222 #endif
1223
1224         /*
1225          * The driver/our work has already reported this event or the
1226          * connection monitoring has kicked in and we have already sent
1227          * a probe request. Or maybe the AP died and the driver keeps
1228          * reporting until we disassociate...
1229          *
1230          * In either case we have to ignore the current call to this
1231          * function (except for setting the correct probe reason bit)
1232          * because otherwise we would reset the timer every time and
1233          * never check whether we received a probe response!
1234          */
1235         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1236                             IEEE80211_STA_CONNECTION_POLL))
1237                 already = true;
1238
1239         if (beacon)
1240                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1241         else
1242                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1243
1244         if (already)
1245                 goto out;
1246
1247         mutex_lock(&sdata->local->iflist_mtx);
1248         ieee80211_recalc_ps(sdata->local, -1);
1249         mutex_unlock(&sdata->local->iflist_mtx);
1250
1251         ifmgd->probe_send_count = 0;
1252         ieee80211_mgd_probe_ap_send(sdata);
1253  out:
1254         mutex_unlock(&ifmgd->mtx);
1255 }
1256
1257 void ieee80211_beacon_loss_work(struct work_struct *work)
1258 {
1259         struct ieee80211_sub_if_data *sdata =
1260                 container_of(work, struct ieee80211_sub_if_data,
1261                              u.mgd.beacon_loss_work);
1262
1263         ieee80211_mgd_probe_ap(sdata, true);
1264 }
1265
1266 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1267 {
1268         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1269
1270         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1271 }
1272 EXPORT_SYMBOL(ieee80211_beacon_loss);
1273
1274 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1275                                      struct ieee80211_mgd_work *wk)
1276 {
1277         wk->state = IEEE80211_MGD_STATE_IDLE;
1278         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1279 }
1280
1281
1282 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1283                                      struct ieee80211_mgd_work *wk,
1284                                      struct ieee80211_mgmt *mgmt,
1285                                      size_t len)
1286 {
1287         u8 *pos;
1288         struct ieee802_11_elems elems;
1289
1290         pos = mgmt->u.auth.variable;
1291         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1292         if (!elems.challenge)
1293                 return;
1294         ieee80211_send_auth(sdata, 3, wk->auth_alg,
1295                             elems.challenge - 2, elems.challenge_len + 2,
1296                             wk->bss->cbss.bssid,
1297                             wk->key, wk->key_len, wk->key_idx);
1298         wk->auth_transaction = 4;
1299 }
1300
1301 static enum rx_mgmt_action __must_check
1302 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1303                        struct ieee80211_mgd_work *wk,
1304                        struct ieee80211_mgmt *mgmt, size_t len)
1305 {
1306         u16 auth_alg, auth_transaction, status_code;
1307
1308         if (wk->state != IEEE80211_MGD_STATE_AUTH)
1309                 return RX_MGMT_NONE;
1310
1311         if (len < 24 + 6)
1312                 return RX_MGMT_NONE;
1313
1314         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1315                 return RX_MGMT_NONE;
1316
1317         if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1318                 return RX_MGMT_NONE;
1319
1320         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1321         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1322         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1323
1324         if (auth_alg != wk->auth_alg ||
1325             auth_transaction != wk->auth_transaction)
1326                 return RX_MGMT_NONE;
1327
1328         if (status_code != WLAN_STATUS_SUCCESS) {
1329                 list_del(&wk->list);
1330                 kfree(wk);
1331                 return RX_MGMT_CFG80211_AUTH;
1332         }
1333
1334         switch (wk->auth_alg) {
1335         case WLAN_AUTH_OPEN:
1336         case WLAN_AUTH_LEAP:
1337         case WLAN_AUTH_FT:
1338                 ieee80211_auth_completed(sdata, wk);
1339                 return RX_MGMT_CFG80211_AUTH;
1340         case WLAN_AUTH_SHARED_KEY:
1341                 if (wk->auth_transaction == 4) {
1342                         ieee80211_auth_completed(sdata, wk);
1343                         return RX_MGMT_CFG80211_AUTH;
1344                 } else
1345                         ieee80211_auth_challenge(sdata, wk, mgmt, len);
1346                 break;
1347         }
1348
1349         return RX_MGMT_NONE;
1350 }
1351
1352
1353 static enum rx_mgmt_action __must_check
1354 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1355                          struct ieee80211_mgd_work *wk,
1356                          struct ieee80211_mgmt *mgmt, size_t len)
1357 {
1358         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1359         const u8 *bssid = NULL;
1360         u16 reason_code;
1361
1362         if (len < 24 + 2)
1363                 return RX_MGMT_NONE;
1364
1365         ASSERT_MGD_MTX(ifmgd);
1366
1367         if (wk)
1368                 bssid = wk->bss->cbss.bssid;
1369         else
1370                 bssid = ifmgd->associated->cbss.bssid;
1371
1372         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1373
1374         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1375                         sdata->dev->name, bssid, reason_code);
1376
1377         if (!wk) {
1378                 ieee80211_set_disassoc(sdata, true);
1379                 ieee80211_recalc_idle(sdata->local);
1380         } else {
1381                 list_del(&wk->list);
1382                 kfree(wk);
1383         }
1384
1385         return RX_MGMT_CFG80211_DEAUTH;
1386 }
1387
1388
1389 static enum rx_mgmt_action __must_check
1390 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1391                            struct ieee80211_mgmt *mgmt, size_t len)
1392 {
1393         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1394         u16 reason_code;
1395
1396         if (len < 24 + 2)
1397                 return RX_MGMT_NONE;
1398
1399         ASSERT_MGD_MTX(ifmgd);
1400
1401         if (WARN_ON(!ifmgd->associated))
1402                 return RX_MGMT_NONE;
1403
1404         if (WARN_ON(memcmp(ifmgd->associated->cbss.bssid, mgmt->sa, ETH_ALEN)))
1405                 return RX_MGMT_NONE;
1406
1407         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1408
1409         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1410                         sdata->dev->name, mgmt->sa, reason_code);
1411
1412         ieee80211_set_disassoc(sdata, false);
1413         ieee80211_recalc_idle(sdata->local);
1414         return RX_MGMT_CFG80211_DISASSOC;
1415 }
1416
1417
1418 static enum rx_mgmt_action __must_check
1419 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1420                              struct ieee80211_mgd_work *wk,
1421                              struct ieee80211_mgmt *mgmt, size_t len,
1422                              bool reassoc)
1423 {
1424         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1425         struct ieee80211_local *local = sdata->local;
1426         struct ieee80211_supported_band *sband;
1427         struct sta_info *sta;
1428         u32 rates, basic_rates;
1429         u16 capab_info, status_code, aid;
1430         struct ieee802_11_elems elems;
1431         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1432         u8 *pos;
1433         u32 changed = 0;
1434         int i, j;
1435         bool have_higher_than_11mbit = false, newsta = false;
1436         u16 ap_ht_cap_flags;
1437
1438         /*
1439          * AssocResp and ReassocResp have identical structure, so process both
1440          * of them in this function.
1441          */
1442
1443         if (len < 24 + 6)
1444                 return RX_MGMT_NONE;
1445
1446         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1447                 return RX_MGMT_NONE;
1448
1449         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1450         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1451         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1452
1453         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1454                "status=%d aid=%d)\n",
1455                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1456                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1457
1458         pos = mgmt->u.assoc_resp.variable;
1459         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1460
1461         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1462             elems.timeout_int && elems.timeout_int_len == 5 &&
1463             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1464                 u32 tu, ms;
1465                 tu = get_unaligned_le32(elems.timeout_int + 1);
1466                 ms = tu * 1024 / 1000;
1467                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1468                        "comeback duration %u TU (%u ms)\n",
1469                        sdata->dev->name, tu, ms);
1470                 wk->timeout = jiffies + msecs_to_jiffies(ms);
1471                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1472                         run_again(ifmgd, jiffies + msecs_to_jiffies(ms));
1473                 return RX_MGMT_NONE;
1474         }
1475
1476         if (status_code != WLAN_STATUS_SUCCESS) {
1477                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1478                        sdata->dev->name, status_code);
1479                 wk->state = IEEE80211_MGD_STATE_IDLE;
1480                 return RX_MGMT_CFG80211_ASSOC;
1481         }
1482
1483         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1484                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1485                        "set\n", sdata->dev->name, aid);
1486         aid &= ~(BIT(15) | BIT(14));
1487
1488         if (!elems.supp_rates) {
1489                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1490                        sdata->dev->name);
1491                 return RX_MGMT_NONE;
1492         }
1493
1494         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1495         ifmgd->aid = aid;
1496
1497         rcu_read_lock();
1498
1499         /* Add STA entry for the AP */
1500         sta = sta_info_get(local, wk->bss->cbss.bssid);
1501         if (!sta) {
1502                 newsta = true;
1503
1504                 rcu_read_unlock();
1505
1506                 sta = sta_info_alloc(sdata, wk->bss->cbss.bssid, GFP_KERNEL);
1507                 if (!sta) {
1508                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1509                                " the AP\n", sdata->dev->name);
1510                         return RX_MGMT_NONE;
1511                 }
1512
1513                 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1514                                    WLAN_STA_ASSOC_AP);
1515                 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1516                         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1517
1518                 rcu_read_lock();
1519         }
1520
1521         rates = 0;
1522         basic_rates = 0;
1523         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1524
1525         for (i = 0; i < elems.supp_rates_len; i++) {
1526                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1527                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1528
1529                 if (rate > 110)
1530                         have_higher_than_11mbit = true;
1531
1532                 for (j = 0; j < sband->n_bitrates; j++) {
1533                         if (sband->bitrates[j].bitrate == rate) {
1534                                 rates |= BIT(j);
1535                                 if (is_basic)
1536                                         basic_rates |= BIT(j);
1537                                 break;
1538                         }
1539                 }
1540         }
1541
1542         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1543                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1544                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1545
1546                 if (rate > 110)
1547                         have_higher_than_11mbit = true;
1548
1549                 for (j = 0; j < sband->n_bitrates; j++) {
1550                         if (sband->bitrates[j].bitrate == rate) {
1551                                 rates |= BIT(j);
1552                                 if (is_basic)
1553                                         basic_rates |= BIT(j);
1554                                 break;
1555                         }
1556                 }
1557         }
1558
1559         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1560         sdata->vif.bss_conf.basic_rates = basic_rates;
1561
1562         /* cf. IEEE 802.11 9.2.12 */
1563         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1564             have_higher_than_11mbit)
1565                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1566         else
1567                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1568
1569         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1570                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1571                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1572
1573         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1574
1575         rate_control_rate_init(sta);
1576
1577         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1578                 set_sta_flags(sta, WLAN_STA_MFP);
1579
1580         if (elems.wmm_param)
1581                 set_sta_flags(sta, WLAN_STA_WME);
1582
1583         if (newsta) {
1584                 int err = sta_info_insert(sta);
1585                 if (err) {
1586                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1587                                " the AP (error %d)\n", sdata->dev->name, err);
1588                         rcu_read_unlock();
1589                         return RX_MGMT_NONE;
1590                 }
1591         }
1592
1593         rcu_read_unlock();
1594
1595         if (elems.wmm_param)
1596                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1597                                          elems.wmm_param_len);
1598         else
1599                 ieee80211_set_wmm_default(sdata);
1600
1601         if (elems.ht_info_elem && elems.wmm_param &&
1602             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1603             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1604                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1605                                                wk->bss->cbss.bssid,
1606                                                ap_ht_cap_flags);
1607
1608         /* delete work item -- must be before set_associated for PS */
1609         list_del(&wk->list);
1610
1611         /* set AID and assoc capability,
1612          * ieee80211_set_associated() will tell the driver */
1613         bss_conf->aid = aid;
1614         bss_conf->assoc_capability = capab_info;
1615         /* this will take ownership of wk */
1616         ieee80211_set_associated(sdata, wk, changed);
1617
1618         /*
1619          * Start timer to probe the connection to the AP now.
1620          * Also start the timer that will detect beacon loss.
1621          */
1622         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1623         mod_beacon_timer(sdata);
1624
1625         return RX_MGMT_CFG80211_ASSOC;
1626 }
1627
1628
1629 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1630                                   struct ieee80211_mgmt *mgmt,
1631                                   size_t len,
1632                                   struct ieee80211_rx_status *rx_status,
1633                                   struct ieee802_11_elems *elems,
1634                                   bool beacon)
1635 {
1636         struct ieee80211_local *local = sdata->local;
1637         int freq;
1638         struct ieee80211_bss *bss;
1639         struct ieee80211_channel *channel;
1640
1641         if (elems->ds_params && elems->ds_params_len == 1)
1642                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1643         else
1644                 freq = rx_status->freq;
1645
1646         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1647
1648         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1649                 return;
1650
1651         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1652                                         channel, beacon);
1653         if (bss)
1654                 ieee80211_rx_bss_put(local, bss);
1655
1656         if (!sdata->u.mgd.associated)
1657                 return;
1658
1659         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1660             (memcmp(mgmt->bssid, sdata->u.mgd.associated->cbss.bssid,
1661                                                         ETH_ALEN) == 0)) {
1662                 struct ieee80211_channel_sw_ie *sw_elem =
1663                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1664                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1665         }
1666 }
1667
1668
1669 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1670                                          struct ieee80211_mgd_work *wk,
1671                                          struct ieee80211_mgmt *mgmt, size_t len,
1672                                          struct ieee80211_rx_status *rx_status)
1673 {
1674         struct ieee80211_if_managed *ifmgd;
1675         size_t baselen;
1676         struct ieee802_11_elems elems;
1677
1678         ifmgd = &sdata->u.mgd;
1679
1680         ASSERT_MGD_MTX(ifmgd);
1681
1682         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1683                 return; /* ignore ProbeResp to foreign address */
1684
1685         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1686         if (baselen > len)
1687                 return;
1688
1689         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1690                                 &elems);
1691
1692         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1693
1694         /* direct probe may be part of the association flow */
1695         if (wk && wk->state == IEEE80211_MGD_STATE_PROBE) {
1696                 printk(KERN_DEBUG "%s: direct probe responded\n",
1697                        sdata->dev->name);
1698                 wk->tries = 0;
1699                 wk->state = IEEE80211_MGD_STATE_AUTH;
1700                 WARN_ON(ieee80211_authenticate(sdata, wk) != RX_MGMT_NONE);
1701         }
1702
1703         if (ifmgd->associated &&
1704             memcmp(mgmt->bssid, ifmgd->associated->cbss.bssid, ETH_ALEN) == 0 &&
1705             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1706                             IEEE80211_STA_CONNECTION_POLL)) {
1707                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1708                                   IEEE80211_STA_BEACON_POLL);
1709                 mutex_lock(&sdata->local->iflist_mtx);
1710                 ieee80211_recalc_ps(sdata->local, -1);
1711                 mutex_unlock(&sdata->local->iflist_mtx);
1712                 /*
1713                  * We've received a probe response, but are not sure whether
1714                  * we have or will be receiving any beacons or data, so let's
1715                  * schedule the timers again, just in case.
1716                  */
1717                 mod_beacon_timer(sdata);
1718                 mod_timer(&ifmgd->conn_mon_timer,
1719                           round_jiffies_up(jiffies +
1720                                            IEEE80211_CONNECTION_IDLE_TIME));
1721         }
1722 }
1723
1724 /*
1725  * This is the canonical list of information elements we care about,
1726  * the filter code also gives us all changes to the Microsoft OUI
1727  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1728  *
1729  * We implement beacon filtering in software since that means we can
1730  * avoid processing the frame here and in cfg80211, and userspace
1731  * will not be able to tell whether the hardware supports it or not.
1732  *
1733  * XXX: This list needs to be dynamic -- userspace needs to be able to
1734  *      add items it requires. It also needs to be able to tell us to
1735  *      look out for other vendor IEs.
1736  */
1737 static const u64 care_about_ies =
1738         (1ULL << WLAN_EID_COUNTRY) |
1739         (1ULL << WLAN_EID_ERP_INFO) |
1740         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1741         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1742         (1ULL << WLAN_EID_HT_CAPABILITY) |
1743         (1ULL << WLAN_EID_HT_INFORMATION);
1744
1745 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1746                                      struct ieee80211_mgmt *mgmt,
1747                                      size_t len,
1748                                      struct ieee80211_rx_status *rx_status)
1749 {
1750         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1751         size_t baselen;
1752         struct ieee802_11_elems elems;
1753         struct ieee80211_local *local = sdata->local;
1754         u32 changed = 0;
1755         bool erp_valid, directed_tim = false;
1756         u8 erp_value = 0;
1757         u32 ncrc;
1758         u8 *bssid;
1759
1760         ASSERT_MGD_MTX(ifmgd);
1761
1762         /* Process beacon from the current BSS */
1763         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1764         if (baselen > len)
1765                 return;
1766
1767         if (rx_status->freq != local->hw.conf.channel->center_freq)
1768                 return;
1769
1770         /*
1771          * We might have received a number of frames, among them a
1772          * disassoc frame and a beacon...
1773          */
1774         if (!ifmgd->associated)
1775                 return;
1776
1777         bssid = ifmgd->associated->cbss.bssid;
1778
1779         /*
1780          * And in theory even frames from a different AP we were just
1781          * associated to a split-second ago!
1782          */
1783         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1784                 return;
1785
1786         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1787 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1788                 if (net_ratelimit()) {
1789                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1790                                "to a received beacon\n", sdata->dev->name);
1791                 }
1792 #endif
1793                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1794                 mutex_lock(&local->iflist_mtx);
1795                 ieee80211_recalc_ps(local, -1);
1796                 mutex_unlock(&local->iflist_mtx);
1797         }
1798
1799         /*
1800          * Push the beacon loss detection into the future since
1801          * we are processing a beacon from the AP just now.
1802          */
1803         mod_beacon_timer(sdata);
1804
1805         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1806         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1807                                           len - baselen, &elems,
1808                                           care_about_ies, ncrc);
1809
1810         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1811                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1812                                                    ifmgd->aid);
1813
1814         if (ncrc != ifmgd->beacon_crc) {
1815                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1816                                       true);
1817
1818                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1819                                          elems.wmm_param_len);
1820         }
1821
1822         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1823                 if (directed_tim) {
1824                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1825                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1826                                 ieee80211_hw_config(local,
1827                                                     IEEE80211_CONF_CHANGE_PS);
1828                                 ieee80211_send_nullfunc(local, sdata, 0);
1829                         } else {
1830                                 local->pspolling = true;
1831
1832                                 /*
1833                                  * Here is assumed that the driver will be
1834                                  * able to send ps-poll frame and receive a
1835                                  * response even though power save mode is
1836                                  * enabled, but some drivers might require
1837                                  * to disable power save here. This needs
1838                                  * to be investigated.
1839                                  */
1840                                 ieee80211_send_pspoll(local, sdata);
1841                         }
1842                 }
1843         }
1844
1845         if (ncrc == ifmgd->beacon_crc)
1846                 return;
1847         ifmgd->beacon_crc = ncrc;
1848
1849         if (elems.erp_info && elems.erp_info_len >= 1) {
1850                 erp_valid = true;
1851                 erp_value = elems.erp_info[0];
1852         } else {
1853                 erp_valid = false;
1854         }
1855         changed |= ieee80211_handle_bss_capability(sdata,
1856                         le16_to_cpu(mgmt->u.beacon.capab_info),
1857                         erp_valid, erp_value);
1858
1859
1860         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1861             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1862                 struct sta_info *sta;
1863                 struct ieee80211_supported_band *sband;
1864                 u16 ap_ht_cap_flags;
1865
1866                 rcu_read_lock();
1867
1868                 sta = sta_info_get(local, bssid);
1869                 if (WARN_ON(!sta)) {
1870                         rcu_read_unlock();
1871                         return;
1872                 }
1873
1874                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1875
1876                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1877                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1878
1879                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1880
1881                 rcu_read_unlock();
1882
1883                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1884                                                bssid, ap_ht_cap_flags);
1885         }
1886
1887         /* Note: country IE parsing is done for us by cfg80211 */
1888         if (elems.country_elem) {
1889                 /* TODO: IBSS also needs this */
1890                 if (elems.pwr_constr_elem)
1891                         ieee80211_handle_pwr_constr(sdata,
1892                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1893                                 elems.pwr_constr_elem,
1894                                 elems.pwr_constr_elem_len);
1895         }
1896
1897         ieee80211_bss_info_change_notify(sdata, changed);
1898 }
1899
1900 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1901                                           struct sk_buff *skb)
1902 {
1903         struct ieee80211_local *local = sdata->local;
1904         struct ieee80211_mgmt *mgmt;
1905         u16 fc;
1906
1907         if (skb->len < 24)
1908                 return RX_DROP_MONITOR;
1909
1910         mgmt = (struct ieee80211_mgmt *) skb->data;
1911         fc = le16_to_cpu(mgmt->frame_control);
1912
1913         switch (fc & IEEE80211_FCTL_STYPE) {
1914         case IEEE80211_STYPE_PROBE_RESP:
1915         case IEEE80211_STYPE_BEACON:
1916         case IEEE80211_STYPE_AUTH:
1917         case IEEE80211_STYPE_ASSOC_RESP:
1918         case IEEE80211_STYPE_REASSOC_RESP:
1919         case IEEE80211_STYPE_DEAUTH:
1920         case IEEE80211_STYPE_DISASSOC:
1921         case IEEE80211_STYPE_ACTION:
1922                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1923                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1924                 return RX_QUEUED;
1925         }
1926
1927         return RX_DROP_MONITOR;
1928 }
1929
1930 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1931                                          struct sk_buff *skb)
1932 {
1933         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1934         struct ieee80211_rx_status *rx_status;
1935         struct ieee80211_mgmt *mgmt;
1936         struct ieee80211_mgd_work *wk;
1937         enum rx_mgmt_action rma = RX_MGMT_NONE;
1938         u16 fc;
1939
1940         rx_status = (struct ieee80211_rx_status *) skb->cb;
1941         mgmt = (struct ieee80211_mgmt *) skb->data;
1942         fc = le16_to_cpu(mgmt->frame_control);
1943
1944         mutex_lock(&ifmgd->mtx);
1945
1946         if (ifmgd->associated &&
1947             memcmp(ifmgd->associated->cbss.bssid, mgmt->bssid,
1948                                                         ETH_ALEN) == 0) {
1949                 switch (fc & IEEE80211_FCTL_STYPE) {
1950                 case IEEE80211_STYPE_BEACON:
1951                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1952                                                  rx_status);
1953                         break;
1954                 case IEEE80211_STYPE_PROBE_RESP:
1955                         ieee80211_rx_mgmt_probe_resp(sdata, NULL, mgmt,
1956                                                      skb->len, rx_status);
1957                         break;
1958                 case IEEE80211_STYPE_DEAUTH:
1959                         rma = ieee80211_rx_mgmt_deauth(sdata, NULL,
1960                                                        mgmt, skb->len);
1961                         break;
1962                 case IEEE80211_STYPE_DISASSOC:
1963                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1964                         break;
1965                 case IEEE80211_STYPE_ACTION:
1966                         /* XXX: differentiate, can only happen for CSA now! */
1967                         ieee80211_sta_process_chanswitch(sdata,
1968                                         &mgmt->u.action.u.chan_switch.sw_elem,
1969                                         ifmgd->associated);
1970                         break;
1971                 }
1972                 mutex_unlock(&ifmgd->mtx);
1973
1974                 switch (rma) {
1975                 case RX_MGMT_NONE:
1976                         /* no action */
1977                         break;
1978                 case RX_MGMT_CFG80211_DEAUTH:
1979                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1980                         break;
1981                 case RX_MGMT_CFG80211_DISASSOC:
1982                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1983                         break;
1984                 default:
1985                         WARN(1, "unexpected: %d", rma);
1986                 }
1987                 goto out;
1988         }
1989
1990         list_for_each_entry(wk, &ifmgd->work_list, list) {
1991                 if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1992                         continue;
1993
1994                 switch (fc & IEEE80211_FCTL_STYPE) {
1995                 case IEEE80211_STYPE_PROBE_RESP:
1996                         ieee80211_rx_mgmt_probe_resp(sdata, wk, mgmt, skb->len,
1997                                                      rx_status);
1998                         break;
1999                 case IEEE80211_STYPE_AUTH:
2000                         rma = ieee80211_rx_mgmt_auth(sdata, wk, mgmt, skb->len);
2001                         break;
2002                 case IEEE80211_STYPE_ASSOC_RESP:
2003                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
2004                                                            skb->len, false);
2005                         break;
2006                 case IEEE80211_STYPE_REASSOC_RESP:
2007                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
2008                                                            skb->len, true);
2009                         break;
2010                 case IEEE80211_STYPE_DEAUTH:
2011                         rma = ieee80211_rx_mgmt_deauth(sdata, wk, mgmt,
2012                                                        skb->len);
2013                         break;
2014                 }
2015                 /*
2016                  * We've processed this frame for that work, so it can't
2017                  * belong to another work struct.
2018                  * NB: this is also required for correctness because the
2019                  * called functions can free 'wk', and for 'rma'!
2020                  */
2021                 break;
2022         }
2023
2024         mutex_unlock(&ifmgd->mtx);
2025
2026         switch (rma) {
2027         case RX_MGMT_NONE:
2028                 /* no action */
2029                 break;
2030         case RX_MGMT_CFG80211_AUTH:
2031                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, skb->len);
2032                 break;
2033         case RX_MGMT_CFG80211_ASSOC:
2034                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, skb->len);
2035                 break;
2036         case RX_MGMT_CFG80211_DEAUTH:
2037                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2038                 break;
2039         default:
2040                 WARN(1, "unexpected: %d", rma);
2041         }
2042
2043  out:
2044         kfree_skb(skb);
2045 }
2046
2047 static void ieee80211_sta_timer(unsigned long data)
2048 {
2049         struct ieee80211_sub_if_data *sdata =
2050                 (struct ieee80211_sub_if_data *) data;
2051         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2052         struct ieee80211_local *local = sdata->local;
2053
2054         if (local->quiescing) {
2055                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2056                 return;
2057         }
2058
2059         ieee80211_queue_work(&local->hw, &ifmgd->work);
2060 }
2061
2062 static void ieee80211_sta_work(struct work_struct *work)
2063 {
2064         struct ieee80211_sub_if_data *sdata =
2065                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2066         struct ieee80211_local *local = sdata->local;
2067         struct ieee80211_if_managed *ifmgd;
2068         struct sk_buff *skb;
2069         struct ieee80211_mgd_work *wk, *tmp;
2070         LIST_HEAD(free_work);
2071         enum rx_mgmt_action rma;
2072         bool anybusy = false;
2073
2074         if (!netif_running(sdata->dev))
2075                 return;
2076
2077         if (local->scanning)
2078                 return;
2079
2080         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2081                 return;
2082
2083         /*
2084          * ieee80211_queue_work() should have picked up most cases,
2085          * here we'll pick the the rest.
2086          */
2087         if (WARN(local->suspended, "STA MLME work scheduled while "
2088                  "going to suspend\n"))
2089                 return;
2090
2091         ifmgd = &sdata->u.mgd;
2092
2093         /* first process frames to avoid timing out while a frame is pending */
2094         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2095                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2096
2097         /* then process the rest of the work */
2098         mutex_lock(&ifmgd->mtx);
2099
2100         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2101                             IEEE80211_STA_CONNECTION_POLL) &&
2102             ifmgd->associated) {
2103                 u8 bssid[ETH_ALEN];
2104
2105                 memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
2106                 if (time_is_after_jiffies(ifmgd->probe_timeout))
2107                         run_again(ifmgd, ifmgd->probe_timeout);
2108
2109                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
2110 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2111                         printk(KERN_DEBUG "No probe response from AP %pM"
2112                                 " after %dms, try %d\n", bssid,
2113                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
2114                                 ifmgd->probe_send_count);
2115 #endif
2116                         ieee80211_mgd_probe_ap_send(sdata);
2117                 } else {
2118                         /*
2119                          * We actually lost the connection ... or did we?
2120                          * Let's make sure!
2121                          */
2122                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2123                                           IEEE80211_STA_BEACON_POLL);
2124                         printk(KERN_DEBUG "No probe response from AP %pM"
2125                                 " after %dms, disconnecting.\n",
2126                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
2127                         ieee80211_set_disassoc(sdata, true);
2128                         ieee80211_recalc_idle(local);
2129                         mutex_unlock(&ifmgd->mtx);
2130                         /*
2131                          * must be outside lock due to cfg80211,
2132                          * but that's not a problem.
2133                          */
2134                         ieee80211_send_deauth_disassoc(sdata, bssid,
2135                                         IEEE80211_STYPE_DEAUTH,
2136                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2137                                         NULL);
2138                         mutex_lock(&ifmgd->mtx);
2139                 }
2140         }
2141
2142
2143         ieee80211_recalc_idle(local);
2144
2145         list_for_each_entry_safe(wk, tmp, &ifmgd->work_list, list) {
2146                 if (time_is_after_jiffies(wk->timeout)) {
2147                         /*
2148                          * This work item isn't supposed to be worked on
2149                          * right now, but take care to adjust the timer
2150                          * properly.
2151                          */
2152                         run_again(ifmgd, wk->timeout);
2153                         continue;
2154                 }
2155
2156                 switch (wk->state) {
2157                 default:
2158                         WARN_ON(1);
2159                         /* fall through */
2160                 case IEEE80211_MGD_STATE_IDLE:
2161                         /* nothing */
2162                         rma = RX_MGMT_NONE;
2163                         break;
2164                 case IEEE80211_MGD_STATE_PROBE:
2165                         rma = ieee80211_direct_probe(sdata, wk);
2166                         break;
2167                 case IEEE80211_MGD_STATE_AUTH:
2168                         rma = ieee80211_authenticate(sdata, wk);
2169                         break;
2170                 case IEEE80211_MGD_STATE_ASSOC:
2171                         rma = ieee80211_associate(sdata, wk);
2172                         break;
2173                 }
2174
2175                 switch (rma) {
2176                 case RX_MGMT_NONE:
2177                         /* no action required */
2178                         break;
2179                 case RX_MGMT_CFG80211_AUTH_TO:
2180                 case RX_MGMT_CFG80211_ASSOC_TO:
2181                         list_del(&wk->list);
2182                         list_add(&wk->list, &free_work);
2183                         wk->tries = rma; /* small abuse but only local */
2184                         break;
2185                 default:
2186                         WARN(1, "unexpected: %d", rma);
2187                 }
2188         }
2189
2190         list_for_each_entry(wk, &ifmgd->work_list, list) {
2191                 if (wk->state != IEEE80211_MGD_STATE_IDLE) {
2192                         anybusy = true;
2193                         break;
2194                 }
2195         }
2196         if (!anybusy &&
2197             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request))
2198                 ieee80211_queue_delayed_work(&local->hw,
2199                                              &local->scan_work,
2200                                              round_jiffies_relative(0));
2201
2202         mutex_unlock(&ifmgd->mtx);
2203
2204         list_for_each_entry_safe(wk, tmp, &free_work, list) {
2205                 switch (wk->tries) {
2206                 case RX_MGMT_CFG80211_AUTH_TO:
2207                         cfg80211_send_auth_timeout(sdata->dev,
2208                                                    wk->bss->cbss.bssid);
2209                         break;
2210                 case RX_MGMT_CFG80211_ASSOC_TO:
2211                         cfg80211_send_assoc_timeout(sdata->dev,
2212                                                     wk->bss->cbss.bssid);
2213                         break;
2214                 default:
2215                         WARN(1, "unexpected: %d", wk->tries);
2216                 }
2217
2218                 list_del(&wk->list);
2219                 kfree(wk);
2220         }
2221
2222         ieee80211_recalc_idle(local);
2223 }
2224
2225 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2226 {
2227         struct ieee80211_sub_if_data *sdata =
2228                 (struct ieee80211_sub_if_data *) data;
2229         struct ieee80211_local *local = sdata->local;
2230
2231         if (local->quiescing)
2232                 return;
2233
2234         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
2235 }
2236
2237 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2238 {
2239         struct ieee80211_sub_if_data *sdata =
2240                 (struct ieee80211_sub_if_data *) data;
2241         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2242         struct ieee80211_local *local = sdata->local;
2243
2244         if (local->quiescing)
2245                 return;
2246
2247         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2248 }
2249
2250 static void ieee80211_sta_monitor_work(struct work_struct *work)
2251 {
2252         struct ieee80211_sub_if_data *sdata =
2253                 container_of(work, struct ieee80211_sub_if_data,
2254                              u.mgd.monitor_work);
2255
2256         ieee80211_mgd_probe_ap(sdata, false);
2257 }
2258
2259 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2260 {
2261         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2262                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2263                                         IEEE80211_STA_CONNECTION_POLL);
2264
2265                 /* let's probe the connection once */
2266                 ieee80211_queue_work(&sdata->local->hw,
2267                            &sdata->u.mgd.monitor_work);
2268                 /* and do all the other regular work too */
2269                 ieee80211_queue_work(&sdata->local->hw,
2270                            &sdata->u.mgd.work);
2271         }
2272 }
2273
2274 #ifdef CONFIG_PM
2275 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2276 {
2277         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2278
2279         /*
2280          * we need to use atomic bitops for the running bits
2281          * only because both timers might fire at the same
2282          * time -- the code here is properly synchronised.
2283          */
2284
2285         cancel_work_sync(&ifmgd->work);
2286         cancel_work_sync(&ifmgd->beacon_loss_work);
2287         if (del_timer_sync(&ifmgd->timer))
2288                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2289
2290         cancel_work_sync(&ifmgd->chswitch_work);
2291         if (del_timer_sync(&ifmgd->chswitch_timer))
2292                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2293
2294         cancel_work_sync(&ifmgd->monitor_work);
2295         /* these will just be re-established on connection */
2296         del_timer_sync(&ifmgd->conn_mon_timer);
2297         del_timer_sync(&ifmgd->bcn_mon_timer);
2298 }
2299
2300 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2301 {
2302         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2303
2304         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2305                 add_timer(&ifmgd->timer);
2306         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2307                 add_timer(&ifmgd->chswitch_timer);
2308 }
2309 #endif
2310
2311 /* interface setup */
2312 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2313 {
2314         struct ieee80211_if_managed *ifmgd;
2315
2316         ifmgd = &sdata->u.mgd;
2317         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2318         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2319         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2320         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2321         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2322                     (unsigned long) sdata);
2323         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2324                     (unsigned long) sdata);
2325         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2326                     (unsigned long) sdata);
2327         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2328                     (unsigned long) sdata);
2329         skb_queue_head_init(&ifmgd->skb_queue);
2330
2331         INIT_LIST_HEAD(&ifmgd->work_list);
2332
2333         ifmgd->capab = WLAN_CAPABILITY_ESS;
2334         ifmgd->flags = 0;
2335         if (sdata->local->hw.queues >= 4)
2336                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2337
2338         mutex_init(&ifmgd->mtx);
2339 }
2340
2341 /* scan finished notification */
2342 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2343 {
2344         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2345
2346         /* Restart STA timers */
2347         rcu_read_lock();
2348         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2349                 ieee80211_restart_sta_timer(sdata);
2350         rcu_read_unlock();
2351 }
2352
2353 int ieee80211_max_network_latency(struct notifier_block *nb,
2354                                   unsigned long data, void *dummy)
2355 {
2356         s32 latency_usec = (s32) data;
2357         struct ieee80211_local *local =
2358                 container_of(nb, struct ieee80211_local,
2359                              network_latency_notifier);
2360
2361         mutex_lock(&local->iflist_mtx);
2362         ieee80211_recalc_ps(local, latency_usec);
2363         mutex_unlock(&local->iflist_mtx);
2364
2365         return 0;
2366 }
2367
2368 /* config hooks */
2369 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2370                        struct cfg80211_auth_request *req)
2371 {
2372         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2373         const u8 *ssid;
2374         struct ieee80211_mgd_work *wk;
2375         u16 auth_alg;
2376
2377         switch (req->auth_type) {
2378         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2379                 auth_alg = WLAN_AUTH_OPEN;
2380                 break;
2381         case NL80211_AUTHTYPE_SHARED_KEY:
2382                 auth_alg = WLAN_AUTH_SHARED_KEY;
2383                 break;
2384         case NL80211_AUTHTYPE_FT:
2385                 auth_alg = WLAN_AUTH_FT;
2386                 break;
2387         case NL80211_AUTHTYPE_NETWORK_EAP:
2388                 auth_alg = WLAN_AUTH_LEAP;
2389                 break;
2390         default:
2391                 return -EOPNOTSUPP;
2392         }
2393
2394         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2395         if (!wk)
2396                 return -ENOMEM;
2397
2398         wk->bss = (void *)req->bss;
2399
2400         if (req->ie && req->ie_len) {
2401                 memcpy(wk->ie, req->ie, req->ie_len);
2402                 wk->ie_len = req->ie_len;
2403         }
2404
2405         if (req->key && req->key_len) {
2406                 wk->key_len = req->key_len;
2407                 wk->key_idx = req->key_idx;
2408                 memcpy(wk->key, req->key, req->key_len);
2409         }
2410
2411         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2412         memcpy(wk->ssid, ssid + 2, ssid[1]);
2413         wk->ssid_len = ssid[1];
2414
2415         wk->state = IEEE80211_MGD_STATE_PROBE;
2416         wk->auth_alg = auth_alg;
2417         wk->timeout = jiffies; /* run right away */
2418
2419         /*
2420          * XXX: if still associated need to tell AP that we're going
2421          *      to sleep and then change channel etc.
2422          */
2423         sdata->local->oper_channel = req->bss->channel;
2424         ieee80211_hw_config(sdata->local, 0);
2425
2426         mutex_lock(&ifmgd->mtx);
2427         list_add(&wk->list, &sdata->u.mgd.work_list);
2428         mutex_unlock(&ifmgd->mtx);
2429
2430         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2431         return 0;
2432 }
2433
2434 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2435                         struct cfg80211_assoc_request *req)
2436 {
2437         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2438         struct ieee80211_mgd_work *wk, *found = NULL;
2439         int i, err;
2440
2441         mutex_lock(&ifmgd->mtx);
2442
2443         list_for_each_entry(wk, &ifmgd->work_list, list) {
2444                 if (&wk->bss->cbss == req->bss &&
2445                     wk->state == IEEE80211_MGD_STATE_IDLE) {
2446                         found = wk;
2447                         break;
2448                 }
2449         }
2450
2451         if (!found) {
2452                 err = -ENOLINK;
2453                 goto out;
2454         }
2455
2456         list_del(&found->list);
2457
2458         wk = krealloc(found, sizeof(*wk) + req->ie_len, GFP_KERNEL);
2459         if (!wk) {
2460                 list_add(&found->list, &ifmgd->work_list);
2461                 err = -ENOMEM;
2462                 goto out;
2463         }
2464
2465         list_add(&wk->list, &ifmgd->work_list);
2466
2467         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2468
2469         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2470                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2471                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2472                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2473                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2474
2475         sdata->local->oper_channel = req->bss->channel;
2476         ieee80211_hw_config(sdata->local, 0);
2477
2478         if (req->ie && req->ie_len) {
2479                 memcpy(wk->ie, req->ie, req->ie_len);
2480                 wk->ie_len = req->ie_len;
2481         } else
2482                 wk->ie_len = 0;
2483
2484         if (req->prev_bssid)
2485                 memcpy(wk->prev_bssid, req->prev_bssid, ETH_ALEN);
2486
2487         wk->state = IEEE80211_MGD_STATE_ASSOC;
2488         wk->tries = 0;
2489         wk->timeout = jiffies; /* run right away */
2490
2491         if (req->use_mfp) {
2492                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2493                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2494         } else {
2495                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2496                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2497         }
2498
2499         if (req->crypto.control_port)
2500                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2501         else
2502                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2503
2504         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2505
2506         err = 0;
2507
2508  out:
2509         mutex_unlock(&ifmgd->mtx);
2510         return err;
2511 }
2512
2513 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2514                          struct cfg80211_deauth_request *req,
2515                          void *cookie)
2516 {
2517         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2518         struct ieee80211_mgd_work *wk;
2519         const u8 *bssid = NULL;
2520         bool not_auth_yet = false;
2521
2522         mutex_lock(&ifmgd->mtx);
2523
2524         if (ifmgd->associated && &ifmgd->associated->cbss == req->bss) {
2525                 bssid = req->bss->bssid;
2526                 ieee80211_set_disassoc(sdata, true);
2527         } else list_for_each_entry(wk, &ifmgd->work_list, list) {
2528                 if (&wk->bss->cbss == req->bss) {
2529                         bssid = req->bss->bssid;
2530                         if (wk->state == IEEE80211_MGD_STATE_PROBE)
2531                                 not_auth_yet = true;
2532                         list_del(&wk->list);
2533                         kfree(wk);
2534                         break;
2535                 }
2536         }
2537
2538         /*
2539          * If somebody requests authentication and we haven't
2540          * sent out an auth frame yet there's no need to send
2541          * out a deauth frame either. If the state was PROBE,
2542          * then this is the case. If it's AUTH we have sent a
2543          * frame, and if it's IDLE we have completed the auth
2544          * process already.
2545          */
2546         if (not_auth_yet) {
2547                 mutex_unlock(&ifmgd->mtx);
2548                 __cfg80211_auth_canceled(sdata->dev, bssid);
2549                 return 0;
2550         }
2551
2552         /*
2553          * cfg80211 should catch this ... but it's racy since
2554          * we can receive a deauth frame, process it, hand it
2555          * to cfg80211 while that's in a locked section already
2556          * trying to tell us that the user wants to disconnect.
2557          */
2558         if (!bssid) {
2559                 mutex_unlock(&ifmgd->mtx);
2560                 return -ENOLINK;
2561         }
2562
2563         mutex_unlock(&ifmgd->mtx);
2564
2565         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2566                sdata->dev->name, bssid, req->reason_code);
2567
2568         ieee80211_send_deauth_disassoc(sdata, bssid,
2569                         IEEE80211_STYPE_DEAUTH, req->reason_code,
2570                         cookie);
2571
2572         ieee80211_recalc_idle(sdata->local);
2573
2574         return 0;
2575 }
2576
2577 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2578                            struct cfg80211_disassoc_request *req,
2579                            void *cookie)
2580 {
2581         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2582
2583         mutex_lock(&ifmgd->mtx);
2584
2585         /*
2586          * cfg80211 should catch this ... but it's racy since
2587          * we can receive a disassoc frame, process it, hand it
2588          * to cfg80211 while that's in a locked section already
2589          * trying to tell us that the user wants to disconnect.
2590          */
2591         if (&ifmgd->associated->cbss != req->bss) {
2592                 mutex_unlock(&ifmgd->mtx);
2593                 return -ENOLINK;
2594         }
2595
2596         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2597                sdata->dev->name, req->bss->bssid, req->reason_code);
2598
2599         ieee80211_set_disassoc(sdata, false);
2600
2601         mutex_unlock(&ifmgd->mtx);
2602
2603         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2604                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2605                         cookie);
2606
2607         ieee80211_recalc_idle(sdata->local);
2608
2609         return 0;
2610 }