Pileus Git - ~andy/linux/blob - 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_MONITORING_INTERVAL (2 * HZ)
  35 #define IEEE80211_PROBE_WAIT (HZ / 5)
  36
  37 #define TMR_RUNNING_TIMER       0
  38 #define TMR_RUNNING_CHANSW      1
  39
  40 /*
  41  * All cfg80211 functions have to be called outside a locked
  42  * section so that they can acquire a lock themselves... This
  43  * is much simpler than queuing up things in cfg80211, but we
  44  * do need some indirection for that here.
  45  */
  46 enum rx_mgmt_action {
  47         /* no action required */
  48         RX_MGMT_NONE,
  49
  50         /* caller must call cfg80211_send_rx_auth() */
  51         RX_MGMT_CFG80211_AUTH,
  52
  53         /* caller must call cfg80211_send_rx_assoc() */
  54         RX_MGMT_CFG80211_ASSOC,
  55
  56         /* caller must call cfg80211_send_deauth() */
  57         RX_MGMT_CFG80211_DEAUTH,
  58
  59         /* caller must call cfg80211_send_disassoc() */
  60         RX_MGMT_CFG80211_DISASSOC,
  61
  62         /* caller must call cfg80211_auth_timeout() & free work */
  63         RX_MGMT_CFG80211_AUTH_TO,
  64
  65         /* caller must call cfg80211_assoc_timeout() & free work */
  66         RX_MGMT_CFG80211_ASSOC_TO,
  67 };
  68
  69 /* utils */
  70 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  71 {
  72         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  73 }
  74
  75 static int ecw2cw(int ecw)
  76 {
  77         return (1 << ecw) - 1;
  78 }
  79
  80 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  81                                       struct ieee80211_supported_band *sband,
  82                                       u32 *rates)
  83 {
  84         int i, j, count;
  85         *rates = 0;
  86         count = 0;
  87         for (i = 0; i < bss->supp_rates_len; i++) {
  88                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  89
  90                 for (j = 0; j < sband->n_bitrates; j++)
  91                         if (sband->bitrates[j].bitrate == rate) {
  92                                 *rates |= BIT(j);
  93                                 count++;
  94                                 break;
  95                         }
  96         }
  97
  98         return count;
  99 }
 100
 101 /*
 102  * ieee80211_enable_ht should be called only after the operating band
 103  * has been determined as ht configuration depends on the hw's
 104  * HT abilities for a specific band.
 105  */
 106 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 107                                struct ieee80211_ht_info *hti,
 108                                const u8 *bssid, u16 ap_ht_cap_flags)
 109 {
 110         struct ieee80211_local *local = sdata->local;
 111         struct ieee80211_supported_band *sband;
 112         struct sta_info *sta;
 113         u32 changed = 0;
 114         u16 ht_opmode;
 115         bool enable_ht = true, ht_changed;
 116         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 117
 118         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 119
 120         /* HT is not supported */
 121         if (!sband->ht_cap.ht_supported)
 122                 enable_ht = false;
 123
 124         /* check that channel matches the right operating channel */
 125         if (local->hw.conf.channel->center_freq !=
 126             ieee80211_channel_to_frequency(hti->control_chan))
 127                 enable_ht = false;
 128
 129         if (enable_ht) {
 130                 channel_type = NL80211_CHAN_HT20;
 131
 132                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 133                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 134                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 135                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 136                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 137                                 if (!(local->hw.conf.channel->flags &
 138                                     IEEE80211_CHAN_NO_HT40PLUS))
 139                                         channel_type = NL80211_CHAN_HT40PLUS;
 140                                 break;
 141                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 142                                 if (!(local->hw.conf.channel->flags &
 143                                     IEEE80211_CHAN_NO_HT40MINUS))
 144                                         channel_type = NL80211_CHAN_HT40MINUS;
 145                                 break;
 146                         }
 147                 }
 148         }
 149
 150         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 151                      channel_type != local->hw.conf.channel_type;
 152
 153         local->oper_channel_type = channel_type;
 154
 155         if (ht_changed) {
 156                 /* channel_type change automatically detected */
 157                 ieee80211_hw_config(local, 0);
 158
 159                 rcu_read_lock();
 160                 sta = sta_info_get(local, bssid);
 161                 if (sta)
 162                         rate_control_rate_update(local, sband, sta,
 163                                                  IEEE80211_RC_HT_CHANGED);
 164                 rcu_read_unlock();
 165         }
 166
 167         /* disable HT */
 168         if (!enable_ht)
 169                 return 0;
 170
 171         ht_opmode = le16_to_cpu(hti->operation_mode);
 172
 173         /* if bss configuration changed store the new one */
 174         if (!sdata->ht_opmode_valid ||
 175             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 176                 changed |= BSS_CHANGED_HT;
 177                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 178                 sdata->ht_opmode_valid = true;
 179         }
 180
 181         return changed;
 182 }
 183
 184 /* frame sending functions */
 185
 186 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
 187                                  struct ieee80211_mgd_work *wk)
 188 {
 189         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 190         struct ieee80211_local *local = sdata->local;
 191         struct sk_buff *skb;
 192         struct ieee80211_mgmt *mgmt;
 193         u8 *pos;
 194         const u8 *ies, *ht_ie;
 195         int i, len, count, rates_len, supp_rates_len;
 196         u16 capab;
 197         int wmm = 0;
 198         struct ieee80211_supported_band *sband;
 199         u32 rates = 0;
 200
 201         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 202                             sizeof(*mgmt) + 200 + wk->ie_len +
 203                             wk->ssid_len);
 204         if (!skb) {
 205                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 206                        "frame\n", sdata->dev->name);
 207                 return;
 208         }
 209         skb_reserve(skb, local->hw.extra_tx_headroom);
 210
 211         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 212
 213         capab = ifmgd->capab;
 214
 215         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 216                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 217                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 218                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 219                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 220         }
 221
 222         if (wk->bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
 223                 capab |= WLAN_CAPABILITY_PRIVACY;
 224         if (wk->bss->wmm_used)
 225                 wmm = 1;
 226
 227         /* get all rates supported by the device and the AP as
 228          * some APs don't like getting a superset of their rates
 229          * in the association request (e.g. D-Link DAP 1353 in
 230          * b-only mode) */
 231         rates_len = ieee80211_compatible_rates(wk->bss, sband, &rates);
 232
 233         if ((wk->bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 234             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 235                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 236
 237         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 238         memset(mgmt, 0, 24);
 239         memcpy(mgmt->da, wk->bss->cbss.bssid, ETH_ALEN);
 240         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 241         memcpy(mgmt->bssid, wk->bss->cbss.bssid, ETH_ALEN);
 242
 243         if (!is_zero_ether_addr(wk->prev_bssid)) {
 244                 skb_put(skb, 10);
 245                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 246                                                   IEEE80211_STYPE_REASSOC_REQ);
 247                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 248                 mgmt->u.reassoc_req.listen_interval =
 249                                 cpu_to_le16(local->hw.conf.listen_interval);
 250                 memcpy(mgmt->u.reassoc_req.current_ap, wk->prev_bssid,
 251                        ETH_ALEN);
 252         } else {
 253                 skb_put(skb, 4);
 254                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 255                                                   IEEE80211_STYPE_ASSOC_REQ);
 256                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 257                 mgmt->u.assoc_req.listen_interval =
 258                                 cpu_to_le16(local->hw.conf.listen_interval);
 259         }
 260
 261         /* SSID */
 262         ies = pos = skb_put(skb, 2 + wk->ssid_len);
 263         *pos++ = WLAN_EID_SSID;
 264         *pos++ = wk->ssid_len;
 265         memcpy(pos, wk->ssid, wk->ssid_len);
 266
 267         /* add all rates which were marked to be used above */
 268         supp_rates_len = rates_len;
 269         if (supp_rates_len > 8)
 270                 supp_rates_len = 8;
 271
 272         len = sband->n_bitrates;
 273         pos = skb_put(skb, supp_rates_len + 2);
 274         *pos++ = WLAN_EID_SUPP_RATES;
 275         *pos++ = supp_rates_len;
 276
 277         count = 0;
 278         for (i = 0; i < sband->n_bitrates; i++) {
 279                 if (BIT(i) & rates) {
 280                         int rate = sband->bitrates[i].bitrate;
 281                         *pos++ = (u8) (rate / 5);
 282                         if (++count == 8)
 283                                 break;
 284                 }
 285         }
 286
 287         if (rates_len > count) {
 288                 pos = skb_put(skb, rates_len - count + 2);
 289                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 290                 *pos++ = rates_len - count;
 291
 292                 for (i++; i < sband->n_bitrates; i++) {
 293                         if (BIT(i) & rates) {
 294                                 int rate = sband->bitrates[i].bitrate;
 295                                 *pos++ = (u8) (rate / 5);
 296                         }
 297                 }
 298         }
 299
 300         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 301                 /* 1. power capabilities */
 302                 pos = skb_put(skb, 4);
 303                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 304                 *pos++ = 2;
 305                 *pos++ = 0; /* min tx power */
 306                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 307
 308                 /* 2. supported channels */
 309                 /* TODO: get this in reg domain format */
 310                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 311                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 312                 *pos++ = 2 * sband->n_channels;
 313                 for (i = 0; i < sband->n_channels; i++) {
 314                         *pos++ = ieee80211_frequency_to_channel(
 315                                         sband->channels[i].center_freq);
 316                         *pos++ = 1; /* one channel in the subband*/
 317                 }
 318         }
 319
 320         if (wk->ie_len && wk->ie) {
 321                 pos = skb_put(skb, wk->ie_len);
 322                 memcpy(pos, wk->ie, wk->ie_len);
 323         }
 324
 325         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
 326                 pos = skb_put(skb, 9);
 327                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 328                 *pos++ = 7; /* len */
 329                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 330                 *pos++ = 0x50;
 331                 *pos++ = 0xf2;
 332                 *pos++ = 2; /* WME */
 333                 *pos++ = 0; /* WME info */
 334                 *pos++ = 1; /* WME ver */
 335                 *pos++ = 0;
 336         }
 337
 338         /* wmm support is a must to HT */
 339         /*
 340          * IEEE802.11n does not allow TKIP/WEP as pairwise
 341          * ciphers in HT mode. We still associate in non-ht
 342          * mode (11a/b/g) if any one of these ciphers is
 343          * configured as pairwise.
 344          */
 345         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
 346             sband->ht_cap.ht_supported &&
 347             (ht_ie = ieee80211_bss_get_ie(&wk->bss->cbss, WLAN_EID_HT_INFORMATION)) &&
 348             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 349             (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))) {
 350                 struct ieee80211_ht_info *ht_info =
 351                         (struct ieee80211_ht_info *)(ht_ie + 2);
 352                 u16 cap = sband->ht_cap.cap;
 353                 __le16 tmp;
 354                 u32 flags = local->hw.conf.channel->flags;
 355
 356                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 357                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 358                         if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 359                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 360                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 361                         }
 362                         break;
 363                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 364                         if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 365                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 366                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 367                         }
 368                         break;
 369                 }
 370
 371                 tmp = cpu_to_le16(cap);
 372                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 373                 *pos++ = WLAN_EID_HT_CAPABILITY;
 374                 *pos++ = sizeof(struct ieee80211_ht_cap);
 375                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 376                 memcpy(pos, &tmp, sizeof(u16));
 377                 pos += sizeof(u16);
 378                 /* TODO: needs a define here for << 2 */
 379                 *pos++ = sband->ht_cap.ampdu_factor |
 380                          (sband->ht_cap.ampdu_density << 2);
 381                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 382         }
 383
 384         ieee80211_tx_skb(sdata, skb, 0);
 385 }
 386
 387
 388 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 389                                            const u8 *bssid, u16 stype, u16 reason)
 390 {
 391         struct ieee80211_local *local = sdata->local;
 392         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 393         struct sk_buff *skb;
 394         struct ieee80211_mgmt *mgmt;
 395
 396         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 397         if (!skb) {
 398                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 399                        "deauth/disassoc frame\n", sdata->dev->name);
 400                 return;
 401         }
 402         skb_reserve(skb, local->hw.extra_tx_headroom);
 403
 404         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 405         memset(mgmt, 0, 24);
 406         memcpy(mgmt->da, bssid, ETH_ALEN);
 407         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 408         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 409         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 410         skb_put(skb, 2);
 411         /* u.deauth.reason_code == u.disassoc.reason_code */
 412         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 413
 414         if (stype == IEEE80211_STYPE_DEAUTH)
 415                 cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, skb->len,
 416                                      GFP_KERNEL);
 417         else
 418                 cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, skb->len,
 419                                        GFP_KERNEL);
 420         ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
 421 }
 422
 423 void ieee80211_send_pspoll(struct ieee80211_local *local,
 424                            struct ieee80211_sub_if_data *sdata)
 425 {
 426         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 427         struct ieee80211_pspoll *pspoll;
 428         struct sk_buff *skb;
 429         u16 fc;
 430
 431         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 432         if (!skb) {
 433                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 434                        "pspoll frame\n", sdata->dev->name);
 435                 return;
 436         }
 437         skb_reserve(skb, local->hw.extra_tx_headroom);
 438
 439         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 440         memset(pspoll, 0, sizeof(*pspoll));
 441         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 442         pspoll->frame_control = cpu_to_le16(fc);
 443         pspoll->aid = cpu_to_le16(ifmgd->aid);
 444
 445         /* aid in PS-Poll has its two MSBs each set to 1 */
 446         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 447
 448         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
 449         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
 450
 451         ieee80211_tx_skb(sdata, skb, 0);
 452 }
 453
 454 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 455                              struct ieee80211_sub_if_data *sdata,
 456                              int powersave)
 457 {
 458         struct sk_buff *skb;
 459         struct ieee80211_hdr *nullfunc;
 460         __le16 fc;
 461
 462         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 463                 return;
 464
 465         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
 466         if (!skb) {
 467                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
 468                        "frame\n", sdata->dev->name);
 469                 return;
 470         }
 471         skb_reserve(skb, local->hw.extra_tx_headroom);
 472
 473         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
 474         memset(nullfunc, 0, 24);
 475         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 476                          IEEE80211_FCTL_TODS);
 477         if (powersave)
 478                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
 479         nullfunc->frame_control = fc;
 480         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 481         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
 482         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 483
 484         ieee80211_tx_skb(sdata, skb, 0);
 485 }
 486
 487 /* spectrum management related things */
 488 static void ieee80211_chswitch_work(struct work_struct *work)
 489 {
 490         struct ieee80211_sub_if_data *sdata =
 491                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 492         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 493
 494         if (!netif_running(sdata->dev))
 495                 return;
 496
 497         mutex_lock(&ifmgd->mtx);
 498         if (!ifmgd->associated)
 499                 goto out;
 500
 501         sdata->local->oper_channel = sdata->local->csa_channel;
 502         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
 503
 504         /* XXX: shouldn't really modify cfg80211-owned data! */
 505         ifmgd->associated->cbss.channel = sdata->local->oper_channel;
 506
 507         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 508                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 509  out:
 510         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 511         mutex_unlock(&ifmgd->mtx);
 512 }
 513
 514 static void ieee80211_chswitch_timer(unsigned long data)
 515 {
 516         struct ieee80211_sub_if_data *sdata =
 517                 (struct ieee80211_sub_if_data *) data;
 518         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 519
 520         if (sdata->local->quiescing) {
 521                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 522                 return;
 523         }
 524
 525         queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work);
 526 }
 527
 528 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 529                                       struct ieee80211_channel_sw_ie *sw_elem,
 530                                       struct ieee80211_bss *bss)
 531 {
 532         struct ieee80211_channel *new_ch;
 533         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 534         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 535
 536         ASSERT_MGD_MTX(ifmgd);
 537
 538         if (!ifmgd->associated)
 539                 return;
 540
 541         if (sdata->local->sw_scanning || sdata->local->hw_scanning)
 542                 return;
 543
 544         /* Disregard subsequent beacons if we are already running a timer
 545            processing a CSA */
 546
 547         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 548                 return;
 549
 550         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 551         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 552                 return;
 553
 554         sdata->local->csa_channel = new_ch;
 555
 556         if (sw_elem->count <= 1) {
 557                 queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work);
 558         } else {
 559                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 560                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 561                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 562                 mod_timer(&ifmgd->chswitch_timer,
 563                           jiffies +
 564                           msecs_to_jiffies(sw_elem->count *
 565                                            bss->cbss.beacon_interval));
 566         }
 567 }
 568
 569 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 570                                         u16 capab_info, u8 *pwr_constr_elem,
 571                                         u8 pwr_constr_elem_len)
 572 {
 573         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 574
 575         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 576                 return;
 577
 578         /* Power constraint IE length should be 1 octet */
 579         if (pwr_constr_elem_len != 1)
 580                 return;
 581
 582         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 583             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 584                 sdata->local->power_constr_level = *pwr_constr_elem;
 585                 ieee80211_hw_config(sdata->local, 0);
 586         }
 587 }
 588
 589 /* powersave */
 590 static void ieee80211_enable_ps(struct ieee80211_local *local,
 591                                 struct ieee80211_sub_if_data *sdata)
 592 {
 593         struct ieee80211_conf *conf = &local->hw.conf;
 594
 595         /*
 596          * If we are scanning right now then the parameters will
 597          * take effect when scan finishes.
 598          */
 599         if (local->hw_scanning || local->sw_scanning)
 600                 return;
 601
 602         if (conf->dynamic_ps_timeout > 0 &&
 603             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 604                 mod_timer(&local->dynamic_ps_timer, jiffies +
 605                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 606         } else {
 607                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 608                         ieee80211_send_nullfunc(local, sdata, 1);
 609                 conf->flags |= IEEE80211_CONF_PS;
 610                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 611         }
 612 }
 613
 614 static void ieee80211_change_ps(struct ieee80211_local *local)
 615 {
 616         struct ieee80211_conf *conf = &local->hw.conf;
 617
 618         if (local->ps_sdata) {
 619                 ieee80211_enable_ps(local, local->ps_sdata);
 620         } else if (conf->flags & IEEE80211_CONF_PS) {
 621                 conf->flags &= ~IEEE80211_CONF_PS;
 622                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 623                 del_timer_sync(&local->dynamic_ps_timer);
 624                 cancel_work_sync(&local->dynamic_ps_enable_work);
 625         }
 626 }
 627
 628 /* need to hold RTNL or interface lock */
 629 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 630 {
 631         struct ieee80211_sub_if_data *sdata, *found = NULL;
 632         int count = 0;
 633
 634         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 635                 local->ps_sdata = NULL;
 636                 return;
 637         }
 638
 639         list_for_each_entry(sdata, &local->interfaces, list) {
 640                 if (!netif_running(sdata->dev))
 641                         continue;
 642                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 643                         continue;
 644                 found = sdata;
 645                 count++;
 646         }
 647
 648         if (count == 1 && found->u.mgd.powersave &&
 649             found->u.mgd.associated && list_empty(&found->u.mgd.work_list) &&
 650             !(found->u.mgd.flags & IEEE80211_STA_PROBEREQ_POLL)) {
 651                 s32 beaconint_us;
 652
 653                 if (latency < 0)
 654                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 655
 656                 beaconint_us = ieee80211_tu_to_usec(
 657                                         found->vif.bss_conf.beacon_int);
 658
 659                 if (beaconint_us > latency) {
 660                         local->ps_sdata = NULL;
 661                 } else {
 662                         u8 dtimper = found->vif.bss_conf.dtim_period;
 663                         int maxslp = 1;
 664
 665                         if (dtimper > 1)
 666                                 maxslp = min_t(int, dtimper,
 667                                                     latency / beaconint_us);
 668
 669                         local->hw.conf.max_sleep_period = maxslp;
 670                         local->ps_sdata = found;
 671                 }
 672         } else {
 673                 local->ps_sdata = NULL;
 674         }
 675
 676         ieee80211_change_ps(local);
 677 }
 678
 679 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 680 {
 681         struct ieee80211_local *local =
 682                 container_of(work, struct ieee80211_local,
 683                              dynamic_ps_disable_work);
 684
 685         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 686                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 687                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 688         }
 689
 690         ieee80211_wake_queues_by_reason(&local->hw,
 691                                         IEEE80211_QUEUE_STOP_REASON_PS);
 692 }
 693
 694 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 695 {
 696         struct ieee80211_local *local =
 697                 container_of(work, struct ieee80211_local,
 698                              dynamic_ps_enable_work);
 699         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 700
 701         /* can only happen when PS was just disabled anyway */
 702         if (!sdata)
 703                 return;
 704
 705         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 706                 return;
 707
 708         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 709                 ieee80211_send_nullfunc(local, sdata, 1);
 710
 711         local->hw.conf.flags |= IEEE80211_CONF_PS;
 712         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 713 }
 714
 715 void ieee80211_dynamic_ps_timer(unsigned long data)
 716 {
 717         struct ieee80211_local *local = (void *) data;
 718
 719         if (local->quiescing)
 720                 return;
 721
 722         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
 723 }
 724
 725 /* MLME */
 726 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 727                                      struct ieee80211_if_managed *ifmgd,
 728                                      u8 *wmm_param, size_t wmm_param_len)
 729 {
 730         struct ieee80211_tx_queue_params params;
 731         size_t left;
 732         int count;
 733         u8 *pos;
 734
 735         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
 736                 return;
 737
 738         if (!wmm_param)
 739                 return;
 740
 741         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 742                 return;
 743         count = wmm_param[6] & 0x0f;
 744         if (count == ifmgd->wmm_last_param_set)
 745                 return;
 746         ifmgd->wmm_last_param_set = count;
 747
 748         pos = wmm_param + 8;
 749         left = wmm_param_len - 8;
 750
 751         memset(&params, 0, sizeof(params));
 752
 753         local->wmm_acm = 0;
 754         for (; left >= 4; left -= 4, pos += 4) {
 755                 int aci = (pos[0] >> 5) & 0x03;
 756                 int acm = (pos[0] >> 4) & 0x01;
 757                 int queue;
 758
 759                 switch (aci) {
 760                 case 1: /* AC_BK */
 761                         queue = 3;
 762                         if (acm)
 763                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 764                         break;
 765                 case 2: /* AC_VI */
 766                         queue = 1;
 767                         if (acm)
 768                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 769                         break;
 770                 case 3: /* AC_VO */
 771                         queue = 0;
 772                         if (acm)
 773                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 774                         break;
 775                 case 0: /* AC_BE */
 776                 default:
 777                         queue = 2;
 778                         if (acm)
 779                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 780                         break;
 781                 }
 782
 783                 params.aifs = pos[0] & 0x0f;
 784                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 785                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 786                 params.txop = get_unaligned_le16(pos + 2);
 787 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 788                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 789                        "cWmin=%d cWmax=%d txop=%d\n",
 790                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 791                        params.aifs, params.cw_min, params.cw_max, params.txop);
 792 #endif
 793                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
 794                         printk(KERN_DEBUG "%s: failed to set TX queue "
 795                                "parameters for queue %d\n",
 796                                wiphy_name(local->hw.wiphy), queue);
 797         }
 798 }
 799
 800 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 801                                            u16 capab, bool erp_valid, u8 erp)
 802 {
 803         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 804         u32 changed = 0;
 805         bool use_protection;
 806         bool use_short_preamble;
 807         bool use_short_slot;
 808
 809         if (erp_valid) {
 810                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 811                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 812         } else {
 813                 use_protection = false;
 814                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 815         }
 816
 817         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 818
 819         if (use_protection != bss_conf->use_cts_prot) {
 820                 bss_conf->use_cts_prot = use_protection;
 821                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 822         }
 823
 824         if (use_short_preamble != bss_conf->use_short_preamble) {
 825                 bss_conf->use_short_preamble = use_short_preamble;
 826                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 827         }
 828
 829         if (use_short_slot != bss_conf->use_short_slot) {
 830                 bss_conf->use_short_slot = use_short_slot;
 831                 changed |= BSS_CHANGED_ERP_SLOT;
 832         }
 833
 834         return changed;
 835 }
 836
 837 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 838                                      struct ieee80211_bss *bss,
 839                                      u32 bss_info_changed)
 840 {
 841         struct ieee80211_local *local = sdata->local;
 842
 843         bss_info_changed |= BSS_CHANGED_ASSOC;
 844         /* set timing information */
 845         sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 846         sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 847         sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 848
 849         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 850         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 851                 bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 852
 853         sdata->u.mgd.associated = bss;
 854         memcpy(sdata->u.mgd.bssid, bss->cbss.bssid, ETH_ALEN);
 855
 856         ieee80211_led_assoc(local, 1);
 857
 858         sdata->vif.bss_conf.assoc = 1;
 859         /*
 860          * For now just always ask the driver to update the basic rateset
 861          * when we have associated, we aren't checking whether it actually
 862          * changed or not.
 863          */
 864         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 865
 866         /* And the BSSID changed - we're associated now */
 867         bss_info_changed |= BSS_CHANGED_BSSID;
 868
 869         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 870
 871         /* will be same as sdata */
 872         if (local->ps_sdata) {
 873                 mutex_lock(&local->iflist_mtx);
 874                 ieee80211_recalc_ps(local, -1);
 875                 mutex_unlock(&local->iflist_mtx);
 876         }
 877
 878         netif_tx_start_all_queues(sdata->dev);
 879         netif_carrier_on(sdata->dev);
 880 }
 881
 882 static enum rx_mgmt_action __must_check
 883 ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
 884                        struct ieee80211_mgd_work *wk)
 885 {
 886         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 887         struct ieee80211_local *local = sdata->local;
 888
 889         wk->tries++;
 890         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
 891                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 892                        sdata->dev->name, wk->bss->cbss.bssid);
 893
 894                 /*
 895                  * Most likely AP is not in the range so remove the
 896                  * bss struct for that AP.
 897                  */
 898                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
 899
 900                 /*
 901                  * We might have a pending scan which had no chance to run yet
 902                  * due to work needing to be done. Hence, queue the STAs work
 903                  * again for that.
 904                  */
 905                 queue_work(local->hw.workqueue, &ifmgd->work);
 906                 return RX_MGMT_CFG80211_AUTH_TO;
 907         }
 908
 909         printk(KERN_DEBUG "%s: direct probe to AP %pM (try %d)\n",
 910                         sdata->dev->name, wk->bss->cbss.bssid,
 911                         wk->tries);
 912
 913         /*
 914          * Direct probe is sent to broadcast address as some APs
 915          * will not answer to direct packet in unassociated state.
 916          */
 917         ieee80211_send_probe_req(sdata, NULL, wk->ssid, wk->ssid_len, NULL, 0);
 918
 919         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
 920         mod_timer(&ifmgd->timer, wk->timeout);
 921
 922         return RX_MGMT_NONE;
 923 }
 924
 925
 926 static enum rx_mgmt_action __must_check
 927 ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
 928                        struct ieee80211_mgd_work *wk)
 929 {
 930         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 931         struct ieee80211_local *local = sdata->local;
 932
 933         wk->tries++;
 934         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
 935                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 936                        " timed out\n",
 937                        sdata->dev->name, wk->bss->cbss.bssid);
 938
 939                 /*
 940                  * Most likely AP is not in the range so remove the
 941                  * bss struct for that AP.
 942                  */
 943                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
 944
 945                 /*
 946                  * We might have a pending scan which had no chance to run yet
 947                  * due to work needing to be done. Hence, queue the STAs work
 948                  * again for that.
 949                  */
 950                 queue_work(local->hw.workqueue, &ifmgd->work);
 951                 return RX_MGMT_CFG80211_AUTH_TO;
 952         }
 953
 954         printk(KERN_DEBUG "%s: authenticate with AP %pM (try %d)\n",
 955                sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
 956
 957         ieee80211_send_auth(sdata, 1, wk->auth_alg, wk->ie, wk->ie_len,
 958                             wk->bss->cbss.bssid, 0);
 959         wk->auth_transaction = 2;
 960
 961         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
 962         mod_timer(&ifmgd->timer, wk->timeout);
 963
 964         return RX_MGMT_NONE;
 965 }
 966
 967 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 968                                    const u8 *bssid, bool deauth)
 969 {
 970         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 971         struct ieee80211_local *local = sdata->local;
 972         struct sta_info *sta;
 973         u32 changed = 0, config_changed = 0;
 974
 975         ASSERT_MGD_MTX(ifmgd);
 976
 977         ifmgd->associated = NULL;
 978         memset(ifmgd->bssid, 0, ETH_ALEN);
 979
 980         /*
 981          * we need to commit the associated = NULL change because the
 982          * scan code uses that to determine whether this iface should
 983          * go to/wake up from powersave or not -- and could otherwise
 984          * wake the queues erroneously.
 985          */
 986         smp_mb();
 987
 988         /*
 989          * Thus, we can only afterwards stop the queues -- to account
 990          * for the case where another CPU is finishing a scan at this
 991          * time -- we don't want the scan code to enable queues.
 992          */
 993
 994         netif_tx_stop_all_queues(sdata->dev);
 995         netif_carrier_off(sdata->dev);
 996
 997         rcu_read_lock();
 998         sta = sta_info_get(local, bssid);
 999         if (sta)
1000                 ieee80211_sta_tear_down_BA_sessions(sta);
1001         rcu_read_unlock();
1002
1003         changed |= ieee80211_reset_erp_info(sdata);
1004
1005         ieee80211_led_assoc(local, 0);
1006         changed |= BSS_CHANGED_ASSOC;
1007         sdata->vif.bss_conf.assoc = false;
1008
1009         ieee80211_set_wmm_default(sdata);
1010
1011         ieee80211_recalc_idle(local);
1012
1013         /* channel(_type) changes are handled by ieee80211_hw_config */
1014         local->oper_channel_type = NL80211_CHAN_NO_HT;
1015
1016         /* on the next assoc, re-program HT parameters */
1017         sdata->ht_opmode_valid = false;
1018
1019         local->power_constr_level = 0;
1020
1021         del_timer_sync(&local->dynamic_ps_timer);
1022         cancel_work_sync(&local->dynamic_ps_enable_work);
1023
1024         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1025                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1026                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1027         }
1028
1029         ieee80211_hw_config(local, config_changed);
1030
1031         /* And the BSSID changed -- not very interesting here */
1032         changed |= BSS_CHANGED_BSSID;
1033         ieee80211_bss_info_change_notify(sdata, changed);
1034
1035         rcu_read_lock();
1036
1037         sta = sta_info_get(local, bssid);
1038         if (!sta) {
1039                 rcu_read_unlock();
1040                 return;
1041         }
1042
1043         sta_info_unlink(&sta);
1044
1045         rcu_read_unlock();
1046
1047         sta_info_destroy(sta);
1048 }
1049
1050 static enum rx_mgmt_action __must_check
1051 ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1052                     struct ieee80211_mgd_work *wk)
1053 {
1054         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1055         struct ieee80211_local *local = sdata->local;
1056
1057         wk->tries++;
1058         if (wk->tries > IEEE80211_ASSOC_MAX_TRIES) {
1059                 printk(KERN_DEBUG "%s: association with AP %pM"
1060                        " timed out\n",
1061                        sdata->dev->name, wk->bss->cbss.bssid);
1062
1063                 /*
1064                  * Most likely AP is not in the range so remove the
1065                  * bss struct for that AP.
1066                  */
1067                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1068
1069                 /*
1070                  * We might have a pending scan which had no chance to run yet
1071                  * due to work needing to be done. Hence, queue the STAs work
1072                  * again for that.
1073                  */
1074                 queue_work(local->hw.workqueue, &ifmgd->work);
1075                 return RX_MGMT_CFG80211_ASSOC_TO;
1076         }
1077
1078         printk(KERN_DEBUG "%s: associate with AP %pM (try %d)\n",
1079                sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1080         ieee80211_send_assoc(sdata, wk);
1081
1082         wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
1083         mod_timer(&ifmgd->timer, wk->timeout);
1084
1085         return RX_MGMT_NONE;
1086 }
1087
1088 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1089                              struct ieee80211_hdr *hdr)
1090 {
1091         /*
1092          * We can postpone the mgd.timer whenever receiving unicast frames
1093          * from AP because we know that the connection is working both ways
1094          * at that time. But multicast frames (and hence also beacons) must
1095          * be ignored here, because we need to trigger the timer during
1096          * data idle periods for sending the periodical probe request to
1097          * the AP.
1098          */
1099         if (!is_multicast_ether_addr(hdr->addr1))
1100                 mod_timer(&sdata->u.mgd.timer,
1101                           jiffies + IEEE80211_MONITORING_INTERVAL);
1102 }
1103
1104 void ieee80211_beacon_loss_work(struct work_struct *work)
1105 {
1106         struct ieee80211_sub_if_data *sdata =
1107                 container_of(work, struct ieee80211_sub_if_data,
1108                              u.mgd.beacon_loss_work);
1109         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1110         const u8 *ssid;
1111
1112         /*
1113          * The driver has already reported this event and we have
1114          * already sent a probe request. Maybe the AP died and the
1115          * driver keeps reporting until we disassociate... We have
1116          * to ignore that because otherwise we would continually
1117          * reset the timer and never check whether we received a
1118          * probe response!
1119          */
1120         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1121                 return;
1122
1123         mutex_lock(&ifmgd->mtx);
1124
1125         if (!ifmgd->associated)
1126                 goto out;
1127
1128 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1129         if (net_ratelimit())
1130                 printk(KERN_DEBUG "%s: driver reports beacon loss from AP "
1131                        "- sending probe request\n", sdata->dev->name);
1132 #endif
1133
1134         ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1135
1136         mutex_lock(&sdata->local->iflist_mtx);
1137         ieee80211_recalc_ps(sdata->local, -1);
1138         mutex_unlock(&sdata->local->iflist_mtx);
1139
1140         ssid = ieee80211_bss_get_ie(&ifmgd->associated->cbss, WLAN_EID_SSID);
1141         ieee80211_send_probe_req(sdata, ifmgd->associated->cbss.bssid,
1142                                  ssid + 2, ssid[1], NULL, 0);
1143
1144         mod_timer(&ifmgd->timer, jiffies + IEEE80211_PROBE_WAIT);
1145  out:
1146         mutex_unlock(&ifmgd->mtx);
1147 }
1148
1149 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1150 {
1151         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1152
1153         queue_work(sdata->local->hw.workqueue,
1154                    &sdata->u.mgd.beacon_loss_work);
1155 }
1156 EXPORT_SYMBOL(ieee80211_beacon_loss);
1157
1158 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1159                                      struct ieee80211_mgd_work *wk)
1160 {
1161         wk->state = IEEE80211_MGD_STATE_IDLE;
1162         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1163 }
1164
1165
1166 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1167                                      struct ieee80211_mgd_work *wk,
1168                                      struct ieee80211_mgmt *mgmt,
1169                                      size_t len)
1170 {
1171         u8 *pos;
1172         struct ieee802_11_elems elems;
1173
1174         pos = mgmt->u.auth.variable;
1175         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1176         if (!elems.challenge)
1177                 return;
1178         ieee80211_send_auth(sdata, 3, wk->auth_alg,
1179                             elems.challenge - 2, elems.challenge_len + 2,
1180                             wk->bss->cbss.bssid, 1);
1181         wk->auth_transaction = 4;
1182 }
1183
1184 static enum rx_mgmt_action __must_check
1185 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1186                        struct ieee80211_mgd_work *wk,
1187                        struct ieee80211_mgmt *mgmt, size_t len)
1188 {
1189         u16 auth_alg, auth_transaction, status_code;
1190
1191         if (wk->state != IEEE80211_MGD_STATE_AUTH)
1192                 return RX_MGMT_NONE;
1193
1194         if (len < 24 + 6)
1195                 return RX_MGMT_NONE;
1196
1197         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1198                 return RX_MGMT_NONE;
1199
1200         if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1201                 return RX_MGMT_NONE;
1202
1203         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1204         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1205         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1206
1207         if (auth_alg != wk->auth_alg ||
1208             auth_transaction != wk->auth_transaction)
1209                 return RX_MGMT_NONE;
1210
1211         if (status_code != WLAN_STATUS_SUCCESS) {
1212                 list_del(&wk->list);
1213                 kfree(wk);
1214                 return RX_MGMT_CFG80211_AUTH;
1215         }
1216
1217         switch (wk->auth_alg) {
1218         case WLAN_AUTH_OPEN:
1219         case WLAN_AUTH_LEAP:
1220         case WLAN_AUTH_FT:
1221                 ieee80211_auth_completed(sdata, wk);
1222                 return RX_MGMT_CFG80211_AUTH;
1223         case WLAN_AUTH_SHARED_KEY:
1224                 if (wk->auth_transaction == 4) {
1225                         ieee80211_auth_completed(sdata, wk);
1226                         return RX_MGMT_CFG80211_AUTH;
1227                 } else
1228                         ieee80211_auth_challenge(sdata, wk, mgmt, len);
1229                 break;
1230         }
1231
1232         return RX_MGMT_NONE;
1233 }
1234
1235
1236 static enum rx_mgmt_action __must_check
1237 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1238                          struct ieee80211_mgd_work *wk,
1239                          struct ieee80211_mgmt *mgmt, size_t len)
1240 {
1241         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1242         const u8 *bssid = NULL;
1243         u16 reason_code;
1244
1245         if (len < 24 + 2)
1246                 return RX_MGMT_NONE;
1247
1248         ASSERT_MGD_MTX(ifmgd);
1249
1250         if (wk)
1251                 bssid = wk->bss->cbss.bssid;
1252         else
1253                 bssid = ifmgd->associated->cbss.bssid;
1254
1255         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1256
1257         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1258                         sdata->dev->name, bssid, reason_code);
1259
1260         if (!wk) {
1261                 ieee80211_set_disassoc(sdata, bssid, true);
1262         } else {
1263                 list_del(&wk->list);
1264                 kfree(wk);
1265         }
1266
1267         return RX_MGMT_CFG80211_DEAUTH;
1268 }
1269
1270
1271 static enum rx_mgmt_action __must_check
1272 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1273                            struct ieee80211_mgmt *mgmt, size_t len)
1274 {
1275         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1276         u16 reason_code;
1277
1278         if (len < 24 + 2)
1279                 return RX_MGMT_NONE;
1280
1281         ASSERT_MGD_MTX(ifmgd);
1282
1283         if (WARN_ON(!ifmgd->associated))
1284                 return RX_MGMT_NONE;
1285
1286         if (WARN_ON(memcmp(ifmgd->associated->cbss.bssid, mgmt->sa, ETH_ALEN)))
1287                 return RX_MGMT_NONE;
1288
1289         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1290
1291         printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1292                         sdata->dev->name, reason_code);
1293
1294         ieee80211_set_disassoc(sdata, ifmgd->associated->cbss.bssid, false);
1295         return RX_MGMT_CFG80211_DISASSOC;
1296 }
1297
1298
1299 static enum rx_mgmt_action __must_check
1300 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1301                              struct ieee80211_mgd_work *wk,
1302                              struct ieee80211_mgmt *mgmt, size_t len,
1303                              bool reassoc)
1304 {
1305         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1306         struct ieee80211_local *local = sdata->local;
1307         struct ieee80211_supported_band *sband;
1308         struct sta_info *sta;
1309         u32 rates, basic_rates;
1310         u16 capab_info, status_code, aid;
1311         struct ieee802_11_elems elems;
1312         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1313         u8 *pos;
1314         u32 changed = 0;
1315         int i, j;
1316         bool have_higher_than_11mbit = false, newsta = false;
1317         u16 ap_ht_cap_flags;
1318
1319         /*
1320          * AssocResp and ReassocResp have identical structure, so process both
1321          * of them in this function.
1322          */
1323
1324         if (len < 24 + 6)
1325                 return RX_MGMT_NONE;
1326
1327         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1328                 return RX_MGMT_NONE;
1329
1330         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1331         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1332         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1333
1334         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1335                "status=%d aid=%d)\n",
1336                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1337                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1338
1339         pos = mgmt->u.assoc_resp.variable;
1340         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1341
1342         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1343             elems.timeout_int && elems.timeout_int_len == 5 &&
1344             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1345                 u32 tu, ms;
1346                 tu = get_unaligned_le32(elems.timeout_int + 1);
1347                 ms = tu * 1024 / 1000;
1348                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1349                        "comeback duration %u TU (%u ms)\n",
1350                        sdata->dev->name, tu, ms);
1351                 wk->timeout = jiffies + msecs_to_jiffies(ms);
1352                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1353                         mod_timer(&ifmgd->timer,
1354                                   jiffies + msecs_to_jiffies(ms));
1355                 return RX_MGMT_NONE;
1356         }
1357
1358         if (status_code != WLAN_STATUS_SUCCESS) {
1359                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1360                        sdata->dev->name, status_code);
1361                 list_del(&wk->list);
1362                 kfree(wk);
1363                 return RX_MGMT_CFG80211_ASSOC;
1364         }
1365
1366         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1367                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1368                        "set\n", sdata->dev->name, aid);
1369         aid &= ~(BIT(15) | BIT(14));
1370
1371         if (!elems.supp_rates) {
1372                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1373                        sdata->dev->name);
1374                 return RX_MGMT_NONE;
1375         }
1376
1377         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1378         ifmgd->aid = aid;
1379
1380         rcu_read_lock();
1381
1382         /* Add STA entry for the AP */
1383         sta = sta_info_get(local, wk->bss->cbss.bssid);
1384         if (!sta) {
1385                 newsta = true;
1386
1387                 rcu_read_unlock();
1388
1389                 sta = sta_info_alloc(sdata, wk->bss->cbss.bssid, GFP_KERNEL);
1390                 if (!sta) {
1391                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1392                                " the AP\n", sdata->dev->name);
1393                         return RX_MGMT_NONE;
1394                 }
1395
1396                 /* update new sta with its last rx activity */
1397                 sta->last_rx = jiffies;
1398
1399                 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1400                                    WLAN_STA_ASSOC_AP);
1401                 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1402                         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1403
1404                 rcu_read_lock();
1405         }
1406
1407         rates = 0;
1408         basic_rates = 0;
1409         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1410
1411         for (i = 0; i < elems.supp_rates_len; i++) {
1412                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1413                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1414
1415                 if (rate > 110)
1416                         have_higher_than_11mbit = true;
1417
1418                 for (j = 0; j < sband->n_bitrates; j++) {
1419                         if (sband->bitrates[j].bitrate == rate) {
1420                                 rates |= BIT(j);
1421                                 if (is_basic)
1422                                         basic_rates |= BIT(j);
1423                                 break;
1424                         }
1425                 }
1426         }
1427
1428         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1429                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1430                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1431
1432                 if (rate > 110)
1433                         have_higher_than_11mbit = true;
1434
1435                 for (j = 0; j < sband->n_bitrates; j++) {
1436                         if (sband->bitrates[j].bitrate == rate) {
1437                                 rates |= BIT(j);
1438                                 if (is_basic)
1439                                         basic_rates |= BIT(j);
1440                                 break;
1441                         }
1442                 }
1443         }
1444
1445         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1446         sdata->vif.bss_conf.basic_rates = basic_rates;
1447
1448         /* cf. IEEE 802.11 9.2.12 */
1449         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1450             have_higher_than_11mbit)
1451                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1452         else
1453                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1454
1455         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1456                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1457                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1458
1459         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1460
1461         rate_control_rate_init(sta);
1462
1463         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1464                 set_sta_flags(sta, WLAN_STA_MFP);
1465
1466         if (elems.wmm_param)
1467                 set_sta_flags(sta, WLAN_STA_WME);
1468
1469         if (newsta) {
1470                 int err = sta_info_insert(sta);
1471                 if (err) {
1472                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1473                                " the AP (error %d)\n", sdata->dev->name, err);
1474                         rcu_read_unlock();
1475                         return RX_MGMT_NONE;
1476                 }
1477         }
1478
1479         rcu_read_unlock();
1480
1481         if (elems.wmm_param)
1482                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1483                                          elems.wmm_param_len);
1484         else
1485                 ieee80211_set_wmm_default(sdata);
1486
1487         if (elems.ht_info_elem && elems.wmm_param &&
1488             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1489             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1490                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1491                                                wk->bss->cbss.bssid,
1492                                                ap_ht_cap_flags);
1493
1494         /* set AID and assoc capability,
1495          * ieee80211_set_associated() will tell the driver */
1496         bss_conf->aid = aid;
1497         bss_conf->assoc_capability = capab_info;
1498         ieee80211_set_associated(sdata, wk->bss, changed);
1499
1500         /*
1501          * initialise the time of last beacon to be the association time,
1502          * otherwise beacon loss check will trigger immediately
1503          */
1504         ifmgd->last_beacon = jiffies;
1505
1506         list_del(&wk->list);
1507         kfree(wk);
1508         return RX_MGMT_CFG80211_ASSOC;
1509 }
1510
1511
1512 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1513                                   struct ieee80211_mgmt *mgmt,
1514                                   size_t len,
1515                                   struct ieee80211_rx_status *rx_status,
1516                                   struct ieee802_11_elems *elems,
1517                                   bool beacon)
1518 {
1519         struct ieee80211_local *local = sdata->local;
1520         int freq;
1521         struct ieee80211_bss *bss;
1522         struct ieee80211_channel *channel;
1523
1524         if (elems->ds_params && elems->ds_params_len == 1)
1525                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1526         else
1527                 freq = rx_status->freq;
1528
1529         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1530
1531         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1532                 return;
1533
1534         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1535                                         channel, beacon);
1536         if (bss)
1537                 ieee80211_rx_bss_put(local, bss);
1538
1539         if (!sdata->u.mgd.associated)
1540                 return;
1541
1542         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1543             (memcmp(mgmt->bssid, sdata->u.mgd.associated->cbss.bssid,
1544                                                         ETH_ALEN) == 0)) {
1545                 struct ieee80211_channel_sw_ie *sw_elem =
1546                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1547                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1548         }
1549 }
1550
1551
1552 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1553                                          struct ieee80211_mgd_work *wk,
1554                                          struct ieee80211_mgmt *mgmt, size_t len,
1555                                          struct ieee80211_rx_status *rx_status)
1556 {
1557         struct ieee80211_if_managed *ifmgd;
1558         size_t baselen;
1559         struct ieee802_11_elems elems;
1560
1561         ifmgd = &sdata->u.mgd;
1562
1563         ASSERT_MGD_MTX(ifmgd);
1564
1565         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1566                 return; /* ignore ProbeResp to foreign address */
1567
1568         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1569         if (baselen > len)
1570                 return;
1571
1572         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1573                                 &elems);
1574
1575         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1576
1577         /* direct probe may be part of the association flow */
1578         if (wk && wk->state == IEEE80211_MGD_STATE_PROBE) {
1579                 printk(KERN_DEBUG "%s direct probe responded\n",
1580                        sdata->dev->name);
1581                 wk->tries = 0;
1582                 wk->state = IEEE80211_MGD_STATE_AUTH;
1583                 WARN_ON(ieee80211_authenticate(sdata, wk) != RX_MGMT_NONE);
1584         }
1585
1586         if (ifmgd->associated &&
1587             memcmp(mgmt->bssid, ifmgd->associated->cbss.bssid, ETH_ALEN) == 0 &&
1588             ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
1589                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1590                 mutex_lock(&sdata->local->iflist_mtx);
1591                 ieee80211_recalc_ps(sdata->local, -1);
1592                 mutex_unlock(&sdata->local->iflist_mtx);
1593         }
1594 }
1595
1596 /*
1597  * This is the canonical list of information elements we care about,
1598  * the filter code also gives us all changes to the Microsoft OUI
1599  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1600  *
1601  * We implement beacon filtering in software since that means we can
1602  * avoid processing the frame here and in cfg80211, and userspace
1603  * will not be able to tell whether the hardware supports it or not.
1604  *
1605  * XXX: This list needs to be dynamic -- userspace needs to be able to
1606  *      add items it requires. It also needs to be able to tell us to
1607  *      look out for other vendor IEs.
1608  */
1609 static const u64 care_about_ies =
1610         (1ULL << WLAN_EID_COUNTRY) |
1611         (1ULL << WLAN_EID_ERP_INFO) |
1612         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1613         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1614         (1ULL << WLAN_EID_HT_CAPABILITY) |
1615         (1ULL << WLAN_EID_HT_INFORMATION);
1616
1617 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1618                                      struct ieee80211_mgmt *mgmt,
1619                                      size_t len,
1620                                      struct ieee80211_rx_status *rx_status)
1621 {
1622         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1623         size_t baselen;
1624         struct ieee802_11_elems elems;
1625         struct ieee80211_local *local = sdata->local;
1626         u32 changed = 0;
1627         bool erp_valid, directed_tim = false;
1628         u8 erp_value = 0;
1629         u32 ncrc;
1630         u8 *bssid;
1631
1632         ASSERT_MGD_MTX(ifmgd);
1633
1634         /* Process beacon from the current BSS */
1635         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1636         if (baselen > len)
1637                 return;
1638
1639         if (rx_status->freq != local->hw.conf.channel->center_freq)
1640                 return;
1641
1642         if (WARN_ON(!ifmgd->associated))
1643                 return;
1644
1645         bssid = ifmgd->associated->cbss.bssid;
1646
1647         if (WARN_ON(memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0))
1648                 return;
1649
1650         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
1651 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1652                 if (net_ratelimit()) {
1653                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1654                                "to a received beacon\n", sdata->dev->name);
1655                 }
1656 #endif
1657                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1658                 mutex_lock(&local->iflist_mtx);
1659                 ieee80211_recalc_ps(local, -1);
1660                 mutex_unlock(&local->iflist_mtx);
1661         }
1662
1663         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1664         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1665                                           len - baselen, &elems,
1666                                           care_about_ies, ncrc);
1667
1668         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1669                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1670                                                    ifmgd->aid);
1671
1672         if (ncrc != ifmgd->beacon_crc) {
1673                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1674                                       true);
1675
1676                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1677                                          elems.wmm_param_len);
1678         }
1679
1680         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1681                 if (directed_tim) {
1682                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1683                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1684                                 ieee80211_hw_config(local,
1685                                                     IEEE80211_CONF_CHANGE_PS);
1686                                 ieee80211_send_nullfunc(local, sdata, 0);
1687                         } else {
1688                                 local->pspolling = true;
1689
1690                                 /*
1691                                  * Here is assumed that the driver will be
1692                                  * able to send ps-poll frame and receive a
1693                                  * response even though power save mode is
1694                                  * enabled, but some drivers might require
1695                                  * to disable power save here. This needs
1696                                  * to be investigated.
1697                                  */
1698                                 ieee80211_send_pspoll(local, sdata);
1699                         }
1700                 }
1701         }
1702
1703         if (ncrc == ifmgd->beacon_crc)
1704                 return;
1705         ifmgd->beacon_crc = ncrc;
1706
1707         if (elems.erp_info && elems.erp_info_len >= 1) {
1708                 erp_valid = true;
1709                 erp_value = elems.erp_info[0];
1710         } else {
1711                 erp_valid = false;
1712         }
1713         changed |= ieee80211_handle_bss_capability(sdata,
1714                         le16_to_cpu(mgmt->u.beacon.capab_info),
1715                         erp_valid, erp_value);
1716
1717
1718         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1719             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1720                 struct sta_info *sta;
1721                 struct ieee80211_supported_band *sband;
1722                 u16 ap_ht_cap_flags;
1723
1724                 rcu_read_lock();
1725
1726                 sta = sta_info_get(local, bssid);
1727                 if (WARN_ON(!sta)) {
1728                         rcu_read_unlock();
1729                         return;
1730                 }
1731
1732                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1733
1734                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1735                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1736
1737                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1738
1739                 rcu_read_unlock();
1740
1741                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1742                                                bssid, ap_ht_cap_flags);
1743         }
1744
1745         if (elems.country_elem) {
1746                 /* Note we are only reviewing this on beacons
1747                  * for the BSSID we are associated to */
1748                 regulatory_hint_11d(local->hw.wiphy,
1749                         elems.country_elem, elems.country_elem_len);
1750
1751                 /* TODO: IBSS also needs this */
1752                 if (elems.pwr_constr_elem)
1753                         ieee80211_handle_pwr_constr(sdata,
1754                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1755                                 elems.pwr_constr_elem,
1756                                 elems.pwr_constr_elem_len);
1757         }
1758
1759         ieee80211_bss_info_change_notify(sdata, changed);
1760 }
1761
1762 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1763                                           struct sk_buff *skb)
1764 {
1765         struct ieee80211_local *local = sdata->local;
1766         struct ieee80211_mgmt *mgmt;
1767         u16 fc;
1768
1769         if (skb->len < 24)
1770                 return RX_DROP_MONITOR;
1771
1772         mgmt = (struct ieee80211_mgmt *) skb->data;
1773         fc = le16_to_cpu(mgmt->frame_control);
1774
1775         switch (fc & IEEE80211_FCTL_STYPE) {
1776         case IEEE80211_STYPE_PROBE_REQ:
1777         case IEEE80211_STYPE_PROBE_RESP:
1778         case IEEE80211_STYPE_BEACON:
1779         case IEEE80211_STYPE_AUTH:
1780         case IEEE80211_STYPE_ASSOC_RESP:
1781         case IEEE80211_STYPE_REASSOC_RESP:
1782         case IEEE80211_STYPE_DEAUTH:
1783         case IEEE80211_STYPE_DISASSOC:
1784         case IEEE80211_STYPE_ACTION:
1785                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1786                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1787                 return RX_QUEUED;
1788         }
1789
1790         return RX_DROP_MONITOR;
1791 }
1792
1793 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1794                                          struct sk_buff *skb)
1795 {
1796         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1797         struct ieee80211_rx_status *rx_status;
1798         struct ieee80211_mgmt *mgmt;
1799         struct ieee80211_mgd_work *wk;
1800         enum rx_mgmt_action rma = RX_MGMT_NONE;
1801         u16 fc;
1802
1803         rx_status = (struct ieee80211_rx_status *) skb->cb;
1804         mgmt = (struct ieee80211_mgmt *) skb->data;
1805         fc = le16_to_cpu(mgmt->frame_control);
1806
1807         mutex_lock(&ifmgd->mtx);
1808
1809         if (ifmgd->associated &&
1810             memcmp(ifmgd->associated->cbss.bssid, mgmt->bssid,
1811                                                         ETH_ALEN) == 0) {
1812                 switch (fc & IEEE80211_FCTL_STYPE) {
1813                 case IEEE80211_STYPE_BEACON:
1814                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1815                                                  rx_status);
1816                         break;
1817                 case IEEE80211_STYPE_PROBE_RESP:
1818                         ieee80211_rx_mgmt_probe_resp(sdata, NULL, mgmt,
1819                                                      skb->len, rx_status);
1820                         break;
1821                 case IEEE80211_STYPE_DEAUTH:
1822                         rma = ieee80211_rx_mgmt_deauth(sdata, NULL,
1823                                                        mgmt, skb->len);
1824                         break;
1825                 case IEEE80211_STYPE_DISASSOC:
1826                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1827                         break;
1828                 case IEEE80211_STYPE_ACTION:
1829                         /* XXX: differentiate, can only happen for CSA now! */
1830                         ieee80211_sta_process_chanswitch(sdata,
1831                                         &mgmt->u.action.u.chan_switch.sw_elem,
1832                                         ifmgd->associated);
1833                         break;
1834                 }
1835                 mutex_unlock(&ifmgd->mtx);
1836
1837                 switch (rma) {
1838                 case RX_MGMT_NONE:
1839                         /* no action */
1840                         break;
1841                 case RX_MGMT_CFG80211_DEAUTH:
1842                         cfg80211_send_deauth(sdata->dev, (u8 *) mgmt,
1843                                              skb->len, GFP_KERNEL);
1844                         break;
1845                 case RX_MGMT_CFG80211_DISASSOC:
1846                         cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt,
1847                                                skb->len, GFP_KERNEL);
1848                         break;
1849                 default:
1850                         WARN(1, "unexpected: %d", rma);
1851                 }
1852                 goto out;
1853         }
1854
1855         list_for_each_entry(wk, &ifmgd->work_list, list) {
1856                 if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1857                         continue;
1858
1859                 switch (fc & IEEE80211_FCTL_STYPE) {
1860                 case IEEE80211_STYPE_PROBE_RESP:
1861                         ieee80211_rx_mgmt_probe_resp(sdata, wk, mgmt, skb->len,
1862                                                      rx_status);
1863                         break;
1864                 case IEEE80211_STYPE_AUTH:
1865                         rma = ieee80211_rx_mgmt_auth(sdata, wk, mgmt, skb->len);
1866                         break;
1867                 case IEEE80211_STYPE_ASSOC_RESP:
1868                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
1869                                                            skb->len, false);
1870                         break;
1871                 case IEEE80211_STYPE_REASSOC_RESP:
1872                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
1873                                                            skb->len, true);
1874                         break;
1875                 case IEEE80211_STYPE_DEAUTH:
1876                         rma = ieee80211_rx_mgmt_deauth(sdata, wk, mgmt,
1877                                                        skb->len);
1878                         break;
1879                 }
1880                 /*
1881                  * We've processed this frame for that work, so it can't
1882                  * belong to another work struct.
1883                  * NB: this is also required for correctness because the
1884                  * called functions can free 'wk', and for 'rma'!
1885                  */
1886                 break;
1887         }
1888
1889         mutex_unlock(&ifmgd->mtx);
1890
1891         switch (rma) {
1892         case RX_MGMT_NONE:
1893                 /* no action */
1894                 break;
1895         case RX_MGMT_CFG80211_AUTH:
1896                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, skb->len,
1897                                       GFP_KERNEL);
1898                 break;
1899         case RX_MGMT_CFG80211_ASSOC:
1900                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, skb->len,
1901                                        GFP_KERNEL);
1902                 break;
1903         default:
1904                 WARN(1, "unexpected: %d", rma);
1905         }
1906
1907  out:
1908         kfree_skb(skb);
1909 }
1910
1911 static void ieee80211_sta_timer(unsigned long data)
1912 {
1913         struct ieee80211_sub_if_data *sdata =
1914                 (struct ieee80211_sub_if_data *) data;
1915         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1916         struct ieee80211_local *local = sdata->local;
1917
1918         if (local->quiescing) {
1919                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1920                 return;
1921         }
1922
1923         queue_work(local->hw.workqueue, &ifmgd->work);
1924 }
1925
1926 static void ieee80211_sta_work(struct work_struct *work)
1927 {
1928         struct ieee80211_sub_if_data *sdata =
1929                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1930         struct ieee80211_local *local = sdata->local;
1931         struct ieee80211_if_managed *ifmgd;
1932         struct sk_buff *skb;
1933         struct ieee80211_mgd_work *wk, *tmp;
1934         LIST_HEAD(free_work);
1935         enum rx_mgmt_action rma;
1936         bool anybusy = false;
1937
1938         if (!netif_running(sdata->dev))
1939                 return;
1940
1941         if (local->sw_scanning || local->hw_scanning)
1942                 return;
1943
1944         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1945                 return;
1946
1947         /*
1948          * Nothing should have been stuffed into the workqueue during
1949          * the suspend->resume cycle. If this WARN is seen then there
1950          * is a bug with either the driver suspend or something in
1951          * mac80211 stuffing into the workqueue which we haven't yet
1952          * cleared during mac80211's suspend cycle.
1953          */
1954         if (WARN_ON(local->suspended))
1955                 return;
1956
1957         ifmgd = &sdata->u.mgd;
1958
1959         /* first process frames to avoid timing out while a frame is pending */
1960         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1961                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1962
1963         /* then process the rest of the work */
1964         mutex_lock(&ifmgd->mtx);
1965
1966         list_for_each_entry(wk, &ifmgd->work_list, list) {
1967                 if (wk->state != IEEE80211_MGD_STATE_IDLE) {
1968                         anybusy = true;
1969                         break;
1970                 }
1971         }
1972
1973         ieee80211_recalc_idle(local);
1974
1975         if (!anybusy) {
1976                 mutex_unlock(&ifmgd->mtx);
1977
1978                 if (test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request))
1979                         queue_delayed_work(local->hw.workqueue,
1980                                            &local->scan_work,
1981                                            round_jiffies_relative(0));
1982                 return;
1983         }
1984
1985         list_for_each_entry_safe(wk, tmp, &ifmgd->work_list, list) {
1986                 if (time_before(jiffies, wk->timeout))
1987                         continue;
1988
1989                 switch (wk->state) {
1990                 default:
1991                         WARN_ON(1);
1992                         /* fall through */
1993                 case IEEE80211_MGD_STATE_IDLE:
1994                         /* nothing */
1995                         rma = RX_MGMT_NONE;
1996                         break;
1997                 case IEEE80211_MGD_STATE_PROBE:
1998                         rma = ieee80211_direct_probe(sdata, wk);
1999                         break;
2000                 case IEEE80211_MGD_STATE_AUTH:
2001                         rma = ieee80211_authenticate(sdata, wk);
2002                         break;
2003                 case IEEE80211_MGD_STATE_ASSOC:
2004                         rma = ieee80211_associate(sdata, wk);
2005                         break;
2006                 }
2007
2008                 switch (rma) {
2009                 case RX_MGMT_NONE:
2010                         /* no action required */
2011                         break;
2012                 case RX_MGMT_CFG80211_AUTH_TO:
2013                 case RX_MGMT_CFG80211_ASSOC_TO:
2014                         list_del(&wk->list);
2015                         list_add(&wk->list, &free_work);
2016                         wk->tries = rma; /* small abuse but only local */
2017                         break;
2018                 default:
2019                         WARN(1, "unexpected: %d", rma);
2020                 }
2021         }
2022
2023         mutex_unlock(&ifmgd->mtx);
2024
2025         list_for_each_entry_safe(wk, tmp, &free_work, list) {
2026                 switch (wk->tries) {
2027                 case RX_MGMT_CFG80211_AUTH_TO:
2028                         cfg80211_send_auth_timeout(sdata->dev,
2029                                                    wk->bss->cbss.bssid,
2030                                                    GFP_KERNEL);
2031                         break;
2032                 case RX_MGMT_CFG80211_ASSOC_TO:
2033                         cfg80211_send_auth_timeout(sdata->dev,
2034                                                    wk->bss->cbss.bssid,
2035                                                    GFP_KERNEL);
2036                         break;
2037                 default:
2038                         WARN(1, "unexpected: %d", wk->tries);
2039                 }
2040
2041                 list_del(&wk->list);
2042                 kfree(wk);
2043         }
2044
2045         ieee80211_recalc_idle(local);
2046 }
2047
2048 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2049 {
2050         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2051                 /*
2052                  * Need to update last_beacon to avoid beacon loss
2053                  * test to trigger.
2054                  */
2055                 sdata->u.mgd.last_beacon = jiffies;
2056
2057                 queue_work(sdata->local->hw.workqueue,
2058                            &sdata->u.mgd.work);
2059         }
2060 }
2061
2062 #ifdef CONFIG_PM
2063 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2064 {
2065         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2066
2067         /*
2068          * we need to use atomic bitops for the running bits
2069          * only because both timers might fire at the same
2070          * time -- the code here is properly synchronised.
2071          */
2072
2073         cancel_work_sync(&ifmgd->work);
2074         cancel_work_sync(&ifmgd->beacon_loss_work);
2075         if (del_timer_sync(&ifmgd->timer))
2076                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2077
2078         cancel_work_sync(&ifmgd->chswitch_work);
2079         if (del_timer_sync(&ifmgd->chswitch_timer))
2080                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2081 }
2082
2083 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2084 {
2085         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2086
2087         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2088                 add_timer(&ifmgd->timer);
2089         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2090                 add_timer(&ifmgd->chswitch_timer);
2091 }
2092 #endif
2093
2094 /* interface setup */
2095 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2096 {
2097         struct ieee80211_if_managed *ifmgd;
2098
2099         ifmgd = &sdata->u.mgd;
2100         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2101         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2102         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2103         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2104                     (unsigned long) sdata);
2105         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2106                     (unsigned long) sdata);
2107         skb_queue_head_init(&ifmgd->skb_queue);
2108
2109         INIT_LIST_HEAD(&ifmgd->work_list);
2110
2111         ifmgd->capab = WLAN_CAPABILITY_ESS;
2112         ifmgd->flags = 0;
2113         if (sdata->local->hw.queues >= 4)
2114                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2115
2116         mutex_init(&ifmgd->mtx);
2117 }
2118
2119 /* scan finished notification */
2120 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2121 {
2122         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2123
2124         /* Restart STA timers */
2125         rcu_read_lock();
2126         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2127                 ieee80211_restart_sta_timer(sdata);
2128         rcu_read_unlock();
2129 }
2130
2131 int ieee80211_max_network_latency(struct notifier_block *nb,
2132                                   unsigned long data, void *dummy)
2133 {
2134         s32 latency_usec = (s32) data;
2135         struct ieee80211_local *local =
2136                 container_of(nb, struct ieee80211_local,
2137                              network_latency_notifier);
2138
2139         mutex_lock(&local->iflist_mtx);
2140         ieee80211_recalc_ps(local, latency_usec);
2141         mutex_unlock(&local->iflist_mtx);
2142
2143         return 0;
2144 }
2145
2146 /* config hooks */
2147 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2148                        struct cfg80211_auth_request *req)
2149 {
2150         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2151         const u8 *ssid;
2152         struct ieee80211_mgd_work *wk;
2153         u16 auth_alg;
2154
2155         switch (req->auth_type) {
2156         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2157                 auth_alg = WLAN_AUTH_OPEN;
2158                 break;
2159         case NL80211_AUTHTYPE_SHARED_KEY:
2160                 auth_alg = WLAN_AUTH_SHARED_KEY;
2161                 break;
2162         case NL80211_AUTHTYPE_FT:
2163                 auth_alg = WLAN_AUTH_FT;
2164                 break;
2165         case NL80211_AUTHTYPE_NETWORK_EAP:
2166                 auth_alg = WLAN_AUTH_LEAP;
2167                 break;
2168         default:
2169                 return -EOPNOTSUPP;
2170         }
2171
2172         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2173         if (!wk)
2174                 return -ENOMEM;
2175
2176         wk->bss = (void *)req->bss;
2177
2178         if (req->ie && req->ie_len) {
2179                 memcpy(wk->ie, req->ie, req->ie_len);
2180                 wk->ie_len = req->ie_len;
2181         }
2182
2183         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2184         memcpy(wk->ssid, ssid + 2, ssid[1]);
2185         wk->ssid_len = ssid[1];
2186
2187         wk->state = IEEE80211_MGD_STATE_PROBE;
2188         wk->auth_alg = auth_alg;
2189
2190         /*
2191          * XXX: if still associated need to tell AP that we're going
2192          *      to sleep and then change channel etc.
2193          */
2194         sdata->local->oper_channel = req->bss->channel;
2195         ieee80211_hw_config(sdata->local, 0);
2196
2197         mutex_lock(&ifmgd->mtx);
2198         list_add(&wk->list, &sdata->u.mgd.work_list);
2199         mutex_unlock(&ifmgd->mtx);
2200
2201         queue_work(sdata->local->hw.workqueue, &sdata->u.mgd.work);
2202         return 0;
2203 }
2204
2205 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2206                         struct cfg80211_assoc_request *req)
2207 {
2208         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2209         struct ieee80211_mgd_work *wk, *found = NULL;
2210         int i, err;
2211
2212         mutex_lock(&ifmgd->mtx);
2213
2214         list_for_each_entry(wk, &ifmgd->work_list, list) {
2215                 if (&wk->bss->cbss == req->bss &&
2216                     wk->state == IEEE80211_MGD_STATE_IDLE) {
2217                         found = wk;
2218                         break;
2219                 }
2220         }
2221
2222         if (!found) {
2223                 err = -ENOLINK;
2224                 goto out;
2225         }
2226
2227         list_del(&found->list);
2228
2229         wk = krealloc(found, sizeof(*wk) + req->ie_len, GFP_KERNEL);
2230         if (!wk) {
2231                 list_add(&found->list, &ifmgd->work_list);
2232                 err = -ENOMEM;
2233                 goto out;
2234         }
2235
2236         list_add(&wk->list, &ifmgd->work_list);
2237
2238         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2239
2240         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2241                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2242                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2243                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2244                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2245
2246         sdata->local->oper_channel = req->bss->channel;
2247         ieee80211_hw_config(sdata->local, 0);
2248
2249         if (req->ie && req->ie_len) {
2250                 memcpy(wk->ie, req->ie, req->ie_len);
2251                 wk->ie_len = req->ie_len;
2252         } else
2253                 wk->ie_len = 0;
2254
2255         if (req->prev_bssid)
2256                 memcpy(wk->prev_bssid, req->prev_bssid, ETH_ALEN);
2257
2258         wk->state = IEEE80211_MGD_STATE_ASSOC;
2259         wk->tries = 0;
2260
2261         if (req->use_mfp) {
2262                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2263                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2264         } else {
2265                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2266                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2267         }
2268
2269         if (req->crypto.control_port)
2270                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2271         else
2272                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2273
2274         queue_work(sdata->local->hw.workqueue, &sdata->u.mgd.work);
2275
2276         err = 0;
2277
2278  out:
2279         mutex_unlock(&ifmgd->mtx);
2280         return err;
2281 }
2282
2283 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2284                          struct cfg80211_deauth_request *req)
2285 {
2286         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2287         struct ieee80211_mgd_work *wk;
2288         const u8 *bssid = NULL;
2289
2290         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2291                sdata->dev->name, req->reason_code);
2292
2293         mutex_lock(&ifmgd->mtx);
2294
2295         if (ifmgd->associated && &ifmgd->associated->cbss == req->bss) {
2296                 bssid = req->bss->bssid;
2297                 ieee80211_set_disassoc(sdata, bssid, true);
2298         } else list_for_each_entry(wk, &ifmgd->work_list, list) {
2299                 if (&wk->bss->cbss == req->bss) {
2300                         bssid = req->bss->bssid;
2301                         list_del(&wk->list);
2302                         kfree(wk);
2303                         break;
2304                 }
2305         }
2306
2307         /* cfg80211 should catch this... */
2308         if (WARN_ON(!bssid)) {
2309                 mutex_unlock(&ifmgd->mtx);
2310                 return -ENOLINK;
2311         }
2312
2313         mutex_unlock(&ifmgd->mtx);
2314
2315         ieee80211_send_deauth_disassoc(sdata, bssid,
2316                         IEEE80211_STYPE_DEAUTH, req->reason_code);
2317
2318         return 0;
2319 }
2320
2321 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2322                            struct cfg80211_disassoc_request *req)
2323 {
2324         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2325
2326         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2327                sdata->dev->name, req->reason_code);
2328
2329         mutex_lock(&ifmgd->mtx);
2330
2331         /* cfg80211 should catch that */
2332         if (WARN_ON(&ifmgd->associated->cbss != req->bss)) {
2333                 mutex_unlock(&ifmgd->mtx);
2334                 return -ENOLINK;
2335         }
2336
2337         ieee80211_set_disassoc(sdata, req->bss->bssid, false);
2338
2339         mutex_unlock(&ifmgd->mtx);
2340
2341         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2342                         IEEE80211_STYPE_DISASSOC, req->reason_code);
2343         return 0;
2344 }