SAFE public projects git trees. - safe/jmp/linux-2.6/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                                            void *cookie)
 391 {
 392         struct ieee80211_local *local = sdata->local;
 393         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 394         struct sk_buff *skb;
 395         struct ieee80211_mgmt *mgmt;
 396
 397         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 398         if (!skb) {
 399                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 400                        "deauth/disassoc frame\n", sdata->dev->name);
 401                 return;
 402         }
 403         skb_reserve(skb, local->hw.extra_tx_headroom);
 404
 405         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 406         memset(mgmt, 0, 24);
 407         memcpy(mgmt->da, bssid, ETH_ALEN);
 408         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 409         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 410         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 411         skb_put(skb, 2);
 412         /* u.deauth.reason_code == u.disassoc.reason_code */
 413         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 414
 415         if (stype == IEEE80211_STYPE_DEAUTH)
 416                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len, cookie);
 417         else
 418                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len, cookie);
 419         ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
 420 }
 421
 422 void ieee80211_send_pspoll(struct ieee80211_local *local,
 423                            struct ieee80211_sub_if_data *sdata)
 424 {
 425         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 426         struct ieee80211_pspoll *pspoll;
 427         struct sk_buff *skb;
 428         u16 fc;
 429
 430         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 431         if (!skb) {
 432                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 433                        "pspoll frame\n", sdata->dev->name);
 434                 return;
 435         }
 436         skb_reserve(skb, local->hw.extra_tx_headroom);
 437
 438         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 439         memset(pspoll, 0, sizeof(*pspoll));
 440         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 441         pspoll->frame_control = cpu_to_le16(fc);
 442         pspoll->aid = cpu_to_le16(ifmgd->aid);
 443
 444         /* aid in PS-Poll has its two MSBs each set to 1 */
 445         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 446
 447         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
 448         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
 449
 450         ieee80211_tx_skb(sdata, skb, 0);
 451 }
 452
 453 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 454                              struct ieee80211_sub_if_data *sdata,
 455                              int powersave)
 456 {
 457         struct sk_buff *skb;
 458         struct ieee80211_hdr *nullfunc;
 459         __le16 fc;
 460
 461         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 462                 return;
 463
 464         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
 465         if (!skb) {
 466                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
 467                        "frame\n", sdata->dev->name);
 468                 return;
 469         }
 470         skb_reserve(skb, local->hw.extra_tx_headroom);
 471
 472         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
 473         memset(nullfunc, 0, 24);
 474         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 475                          IEEE80211_FCTL_TODS);
 476         if (powersave)
 477                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
 478         nullfunc->frame_control = fc;
 479         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 480         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
 481         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 482
 483         ieee80211_tx_skb(sdata, skb, 0);
 484 }
 485
 486 /* spectrum management related things */
 487 static void ieee80211_chswitch_work(struct work_struct *work)
 488 {
 489         struct ieee80211_sub_if_data *sdata =
 490                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 491         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 492
 493         if (!netif_running(sdata->dev))
 494                 return;
 495
 496         mutex_lock(&ifmgd->mtx);
 497         if (!ifmgd->associated)
 498                 goto out;
 499
 500         sdata->local->oper_channel = sdata->local->csa_channel;
 501         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
 502
 503         /* XXX: shouldn't really modify cfg80211-owned data! */
 504         ifmgd->associated->cbss.channel = sdata->local->oper_channel;
 505
 506         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 507                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 508  out:
 509         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 510         mutex_unlock(&ifmgd->mtx);
 511 }
 512
 513 static void ieee80211_chswitch_timer(unsigned long data)
 514 {
 515         struct ieee80211_sub_if_data *sdata =
 516                 (struct ieee80211_sub_if_data *) data;
 517         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 518
 519         if (sdata->local->quiescing) {
 520                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 521                 return;
 522         }
 523
 524         queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work);
 525 }
 526
 527 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 528                                       struct ieee80211_channel_sw_ie *sw_elem,
 529                                       struct ieee80211_bss *bss)
 530 {
 531         struct ieee80211_channel *new_ch;
 532         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 533         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 534
 535         ASSERT_MGD_MTX(ifmgd);
 536
 537         if (!ifmgd->associated)
 538                 return;
 539
 540         if (sdata->local->sw_scanning || sdata->local->hw_scanning)
 541                 return;
 542
 543         /* Disregard subsequent beacons if we are already running a timer
 544            processing a CSA */
 545
 546         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 547                 return;
 548
 549         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 550         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 551                 return;
 552
 553         sdata->local->csa_channel = new_ch;
 554
 555         if (sw_elem->count <= 1) {
 556                 queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work);
 557         } else {
 558                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 559                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 560                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 561                 mod_timer(&ifmgd->chswitch_timer,
 562                           jiffies +
 563                           msecs_to_jiffies(sw_elem->count *
 564                                            bss->cbss.beacon_interval));
 565         }
 566 }
 567
 568 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 569                                         u16 capab_info, u8 *pwr_constr_elem,
 570                                         u8 pwr_constr_elem_len)
 571 {
 572         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 573
 574         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 575                 return;
 576
 577         /* Power constraint IE length should be 1 octet */
 578         if (pwr_constr_elem_len != 1)
 579                 return;
 580
 581         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 582             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 583                 sdata->local->power_constr_level = *pwr_constr_elem;
 584                 ieee80211_hw_config(sdata->local, 0);
 585         }
 586 }
 587
 588 /* powersave */
 589 static void ieee80211_enable_ps(struct ieee80211_local *local,
 590                                 struct ieee80211_sub_if_data *sdata)
 591 {
 592         struct ieee80211_conf *conf = &local->hw.conf;
 593
 594         /*
 595          * If we are scanning right now then the parameters will
 596          * take effect when scan finishes.
 597          */
 598         if (local->hw_scanning || local->sw_scanning)
 599                 return;
 600
 601         if (conf->dynamic_ps_timeout > 0 &&
 602             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 603                 mod_timer(&local->dynamic_ps_timer, jiffies +
 604                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 605         } else {
 606                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 607                         ieee80211_send_nullfunc(local, sdata, 1);
 608                 conf->flags |= IEEE80211_CONF_PS;
 609                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 610         }
 611 }
 612
 613 static void ieee80211_change_ps(struct ieee80211_local *local)
 614 {
 615         struct ieee80211_conf *conf = &local->hw.conf;
 616
 617         if (local->ps_sdata) {
 618                 ieee80211_enable_ps(local, local->ps_sdata);
 619         } else if (conf->flags & IEEE80211_CONF_PS) {
 620                 conf->flags &= ~IEEE80211_CONF_PS;
 621                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 622                 del_timer_sync(&local->dynamic_ps_timer);
 623                 cancel_work_sync(&local->dynamic_ps_enable_work);
 624         }
 625 }
 626
 627 /* need to hold RTNL or interface lock */
 628 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 629 {
 630         struct ieee80211_sub_if_data *sdata, *found = NULL;
 631         int count = 0;
 632
 633         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 634                 local->ps_sdata = NULL;
 635                 return;
 636         }
 637
 638         list_for_each_entry(sdata, &local->interfaces, list) {
 639                 if (!netif_running(sdata->dev))
 640                         continue;
 641                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 642                         continue;
 643                 found = sdata;
 644                 count++;
 645         }
 646
 647         if (count == 1 && found->u.mgd.powersave &&
 648             found->u.mgd.associated && list_empty(&found->u.mgd.work_list) &&
 649             !(found->u.mgd.flags & IEEE80211_STA_PROBEREQ_POLL)) {
 650                 s32 beaconint_us;
 651
 652                 if (latency < 0)
 653                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 654
 655                 beaconint_us = ieee80211_tu_to_usec(
 656                                         found->vif.bss_conf.beacon_int);
 657
 658                 if (beaconint_us > latency) {
 659                         local->ps_sdata = NULL;
 660                 } else {
 661                         u8 dtimper = found->vif.bss_conf.dtim_period;
 662                         int maxslp = 1;
 663
 664                         if (dtimper > 1)
 665                                 maxslp = min_t(int, dtimper,
 666                                                     latency / beaconint_us);
 667
 668                         local->hw.conf.max_sleep_period = maxslp;
 669                         local->ps_sdata = found;
 670                 }
 671         } else {
 672                 local->ps_sdata = NULL;
 673         }
 674
 675         ieee80211_change_ps(local);
 676 }
 677
 678 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 679 {
 680         struct ieee80211_local *local =
 681                 container_of(work, struct ieee80211_local,
 682                              dynamic_ps_disable_work);
 683
 684         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 685                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 686                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 687         }
 688
 689         ieee80211_wake_queues_by_reason(&local->hw,
 690                                         IEEE80211_QUEUE_STOP_REASON_PS);
 691 }
 692
 693 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 694 {
 695         struct ieee80211_local *local =
 696                 container_of(work, struct ieee80211_local,
 697                              dynamic_ps_enable_work);
 698         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 699
 700         /* can only happen when PS was just disabled anyway */
 701         if (!sdata)
 702                 return;
 703
 704         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 705                 return;
 706
 707         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 708                 ieee80211_send_nullfunc(local, sdata, 1);
 709
 710         local->hw.conf.flags |= IEEE80211_CONF_PS;
 711         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 712 }
 713
 714 void ieee80211_dynamic_ps_timer(unsigned long data)
 715 {
 716         struct ieee80211_local *local = (void *) data;
 717
 718         if (local->quiescing)
 719                 return;
 720
 721         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
 722 }
 723
 724 /* MLME */
 725 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 726                                      struct ieee80211_if_managed *ifmgd,
 727                                      u8 *wmm_param, size_t wmm_param_len)
 728 {
 729         struct ieee80211_tx_queue_params params;
 730         size_t left;
 731         int count;
 732         u8 *pos;
 733
 734         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
 735                 return;
 736
 737         if (!wmm_param)
 738                 return;
 739
 740         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 741                 return;
 742         count = wmm_param[6] & 0x0f;
 743         if (count == ifmgd->wmm_last_param_set)
 744                 return;
 745         ifmgd->wmm_last_param_set = count;
 746
 747         pos = wmm_param + 8;
 748         left = wmm_param_len - 8;
 749
 750         memset(&params, 0, sizeof(params));
 751
 752         local->wmm_acm = 0;
 753         for (; left >= 4; left -= 4, pos += 4) {
 754                 int aci = (pos[0] >> 5) & 0x03;
 755                 int acm = (pos[0] >> 4) & 0x01;
 756                 int queue;
 757
 758                 switch (aci) {
 759                 case 1: /* AC_BK */
 760                         queue = 3;
 761                         if (acm)
 762                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 763                         break;
 764                 case 2: /* AC_VI */
 765                         queue = 1;
 766                         if (acm)
 767                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 768                         break;
 769                 case 3: /* AC_VO */
 770                         queue = 0;
 771                         if (acm)
 772                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 773                         break;
 774                 case 0: /* AC_BE */
 775                 default:
 776                         queue = 2;
 777                         if (acm)
 778                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 779                         break;
 780                 }
 781
 782                 params.aifs = pos[0] & 0x0f;
 783                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 784                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 785                 params.txop = get_unaligned_le16(pos + 2);
 786 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 787                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 788                        "cWmin=%d cWmax=%d txop=%d\n",
 789                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 790                        params.aifs, params.cw_min, params.cw_max, params.txop);
 791 #endif
 792                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
 793                         printk(KERN_DEBUG "%s: failed to set TX queue "
 794                                "parameters for queue %d\n",
 795                                wiphy_name(local->hw.wiphy), queue);
 796         }
 797 }
 798
 799 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 800                                            u16 capab, bool erp_valid, u8 erp)
 801 {
 802         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 803         u32 changed = 0;
 804         bool use_protection;
 805         bool use_short_preamble;
 806         bool use_short_slot;
 807
 808         if (erp_valid) {
 809                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 810                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 811         } else {
 812                 use_protection = false;
 813                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 814         }
 815
 816         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 817
 818         if (use_protection != bss_conf->use_cts_prot) {
 819                 bss_conf->use_cts_prot = use_protection;
 820                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 821         }
 822
 823         if (use_short_preamble != bss_conf->use_short_preamble) {
 824                 bss_conf->use_short_preamble = use_short_preamble;
 825                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 826         }
 827
 828         if (use_short_slot != bss_conf->use_short_slot) {
 829                 bss_conf->use_short_slot = use_short_slot;
 830                 changed |= BSS_CHANGED_ERP_SLOT;
 831         }
 832
 833         return changed;
 834 }
 835
 836 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 837                                      struct ieee80211_bss *bss,
 838                                      u32 bss_info_changed)
 839 {
 840         struct ieee80211_local *local = sdata->local;
 841
 842         bss_info_changed |= BSS_CHANGED_ASSOC;
 843         /* set timing information */
 844         sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 845         sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 846         sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 847
 848         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 849         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 850                 bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 851
 852         sdata->u.mgd.associated = bss;
 853         memcpy(sdata->u.mgd.bssid, bss->cbss.bssid, ETH_ALEN);
 854
 855         ieee80211_led_assoc(local, 1);
 856
 857         sdata->vif.bss_conf.assoc = 1;
 858         /*
 859          * For now just always ask the driver to update the basic rateset
 860          * when we have associated, we aren't checking whether it actually
 861          * changed or not.
 862          */
 863         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 864
 865         /* And the BSSID changed - we're associated now */
 866         bss_info_changed |= BSS_CHANGED_BSSID;
 867
 868         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 869
 870         /* will be same as sdata */
 871         if (local->ps_sdata) {
 872                 mutex_lock(&local->iflist_mtx);
 873                 ieee80211_recalc_ps(local, -1);
 874                 mutex_unlock(&local->iflist_mtx);
 875         }
 876
 877         netif_tx_start_all_queues(sdata->dev);
 878         netif_carrier_on(sdata->dev);
 879 }
 880
 881 static enum rx_mgmt_action __must_check
 882 ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
 883                        struct ieee80211_mgd_work *wk)
 884 {
 885         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 886         struct ieee80211_local *local = sdata->local;
 887
 888         wk->tries++;
 889         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
 890                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 891                        sdata->dev->name, wk->bss->cbss.bssid);
 892
 893                 /*
 894                  * Most likely AP is not in the range so remove the
 895                  * bss struct for that AP.
 896                  */
 897                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
 898
 899                 /*
 900                  * We might have a pending scan which had no chance to run yet
 901                  * due to work needing to be done. Hence, queue the STAs work
 902                  * again for that.
 903                  */
 904                 queue_work(local->hw.workqueue, &ifmgd->work);
 905                 return RX_MGMT_CFG80211_AUTH_TO;
 906         }
 907
 908         printk(KERN_DEBUG "%s: direct probe to AP %pM (try %d)\n",
 909                         sdata->dev->name, wk->bss->cbss.bssid,
 910                         wk->tries);
 911
 912         /*
 913          * Direct probe is sent to broadcast address as some APs
 914          * will not answer to direct packet in unassociated state.
 915          */
 916         ieee80211_send_probe_req(sdata, NULL, wk->ssid, wk->ssid_len, NULL, 0);
 917
 918         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
 919         mod_timer(&ifmgd->timer, wk->timeout);
 920
 921         return RX_MGMT_NONE;
 922 }
 923
 924
 925 static enum rx_mgmt_action __must_check
 926 ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
 927                        struct ieee80211_mgd_work *wk)
 928 {
 929         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 930         struct ieee80211_local *local = sdata->local;
 931
 932         wk->tries++;
 933         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
 934                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 935                        " timed out\n",
 936                        sdata->dev->name, wk->bss->cbss.bssid);
 937
 938                 /*
 939                  * Most likely AP is not in the range so remove the
 940                  * bss struct for that AP.
 941                  */
 942                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
 943
 944                 /*
 945                  * We might have a pending scan which had no chance to run yet
 946                  * due to work needing to be done. Hence, queue the STAs work
 947                  * again for that.
 948                  */
 949                 queue_work(local->hw.workqueue, &ifmgd->work);
 950                 return RX_MGMT_CFG80211_AUTH_TO;
 951         }
 952
 953         printk(KERN_DEBUG "%s: authenticate with AP %pM (try %d)\n",
 954                sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
 955
 956         ieee80211_send_auth(sdata, 1, wk->auth_alg, wk->ie, wk->ie_len,
 957                             wk->bss->cbss.bssid, 0);
 958         wk->auth_transaction = 2;
 959
 960         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
 961         mod_timer(&ifmgd->timer, wk->timeout);
 962
 963         return RX_MGMT_NONE;
 964 }
 965
 966 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 967                                    const u8 *bssid, bool deauth)
 968 {
 969         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 970         struct ieee80211_local *local = sdata->local;
 971         struct sta_info *sta;
 972         u32 changed = 0, config_changed = 0;
 973
 974         ASSERT_MGD_MTX(ifmgd);
 975
 976         ifmgd->associated = NULL;
 977         memset(ifmgd->bssid, 0, ETH_ALEN);
 978
 979         /*
 980          * we need to commit the associated = NULL change because the
 981          * scan code uses that to determine whether this iface should
 982          * go to/wake up from powersave or not -- and could otherwise
 983          * wake the queues erroneously.
 984          */
 985         smp_mb();
 986
 987         /*
 988          * Thus, we can only afterwards stop the queues -- to account
 989          * for the case where another CPU is finishing a scan at this
 990          * time -- we don't want the scan code to enable queues.
 991          */
 992
 993         netif_tx_stop_all_queues(sdata->dev);
 994         netif_carrier_off(sdata->dev);
 995
 996         rcu_read_lock();
 997         sta = sta_info_get(local, bssid);
 998         if (sta)
 999                 ieee80211_sta_tear_down_BA_sessions(sta);
1000         rcu_read_unlock();
1001
1002         changed |= ieee80211_reset_erp_info(sdata);
1003
1004         ieee80211_led_assoc(local, 0);
1005         changed |= BSS_CHANGED_ASSOC;
1006         sdata->vif.bss_conf.assoc = false;
1007
1008         ieee80211_set_wmm_default(sdata);
1009
1010         ieee80211_recalc_idle(local);
1011
1012         /* channel(_type) changes are handled by ieee80211_hw_config */
1013         local->oper_channel_type = NL80211_CHAN_NO_HT;
1014
1015         /* on the next assoc, re-program HT parameters */
1016         sdata->ht_opmode_valid = false;
1017
1018         local->power_constr_level = 0;
1019
1020         del_timer_sync(&local->dynamic_ps_timer);
1021         cancel_work_sync(&local->dynamic_ps_enable_work);
1022
1023         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1024                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1025                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1026         }
1027
1028         ieee80211_hw_config(local, config_changed);
1029
1030         /* And the BSSID changed -- not very interesting here */
1031         changed |= BSS_CHANGED_BSSID;
1032         ieee80211_bss_info_change_notify(sdata, changed);
1033
1034         rcu_read_lock();
1035
1036         sta = sta_info_get(local, bssid);
1037         if (!sta) {
1038                 rcu_read_unlock();
1039                 return;
1040         }
1041
1042         sta_info_unlink(&sta);
1043
1044         rcu_read_unlock();
1045
1046         sta_info_destroy(sta);
1047 }
1048
1049 static enum rx_mgmt_action __must_check
1050 ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1051                     struct ieee80211_mgd_work *wk)
1052 {
1053         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1054         struct ieee80211_local *local = sdata->local;
1055
1056         wk->tries++;
1057         if (wk->tries > IEEE80211_ASSOC_MAX_TRIES) {
1058                 printk(KERN_DEBUG "%s: association with AP %pM"
1059                        " timed out\n",
1060                        sdata->dev->name, wk->bss->cbss.bssid);
1061
1062                 /*
1063                  * Most likely AP is not in the range so remove the
1064                  * bss struct for that AP.
1065                  */
1066                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1067
1068                 /*
1069                  * We might have a pending scan which had no chance to run yet
1070                  * due to work needing to be done. Hence, queue the STAs work
1071                  * again for that.
1072                  */
1073                 queue_work(local->hw.workqueue, &ifmgd->work);
1074                 return RX_MGMT_CFG80211_ASSOC_TO;
1075         }
1076
1077         printk(KERN_DEBUG "%s: associate with AP %pM (try %d)\n",
1078                sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1079         ieee80211_send_assoc(sdata, wk);
1080
1081         wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
1082         mod_timer(&ifmgd->timer, wk->timeout);
1083
1084         return RX_MGMT_NONE;
1085 }
1086
1087 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1088                              struct ieee80211_hdr *hdr)
1089 {
1090         /*
1091          * We can postpone the mgd.timer whenever receiving unicast frames
1092          * from AP because we know that the connection is working both ways
1093          * at that time. But multicast frames (and hence also beacons) must
1094          * be ignored here, because we need to trigger the timer during
1095          * data idle periods for sending the periodical probe request to
1096          * the AP.
1097          */
1098         if (!is_multicast_ether_addr(hdr->addr1))
1099                 mod_timer(&sdata->u.mgd.timer,
1100                           jiffies + IEEE80211_MONITORING_INTERVAL);
1101 }
1102
1103 void ieee80211_beacon_loss_work(struct work_struct *work)
1104 {
1105         struct ieee80211_sub_if_data *sdata =
1106                 container_of(work, struct ieee80211_sub_if_data,
1107                              u.mgd.beacon_loss_work);
1108         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1109         const u8 *ssid;
1110
1111         /*
1112          * The driver has already reported this event and we have
1113          * already sent a probe request. Maybe the AP died and the
1114          * driver keeps reporting until we disassociate... We have
1115          * to ignore that because otherwise we would continually
1116          * reset the timer and never check whether we received a
1117          * probe response!
1118          */
1119         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1120                 return;
1121
1122         mutex_lock(&ifmgd->mtx);
1123
1124         if (!ifmgd->associated)
1125                 goto out;
1126
1127 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1128         if (net_ratelimit())
1129                 printk(KERN_DEBUG "%s: driver reports beacon loss from AP "
1130                        "- sending probe request\n", sdata->dev->name);
1131 #endif
1132
1133         ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1134
1135         mutex_lock(&sdata->local->iflist_mtx);
1136         ieee80211_recalc_ps(sdata->local, -1);
1137         mutex_unlock(&sdata->local->iflist_mtx);
1138
1139         ssid = ieee80211_bss_get_ie(&ifmgd->associated->cbss, WLAN_EID_SSID);
1140         ieee80211_send_probe_req(sdata, ifmgd->associated->cbss.bssid,
1141                                  ssid + 2, ssid[1], NULL, 0);
1142
1143         mod_timer(&ifmgd->timer, jiffies + IEEE80211_PROBE_WAIT);
1144  out:
1145         mutex_unlock(&ifmgd->mtx);
1146 }
1147
1148 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1149 {
1150         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1151
1152         queue_work(sdata->local->hw.workqueue,
1153                    &sdata->u.mgd.beacon_loss_work);
1154 }
1155 EXPORT_SYMBOL(ieee80211_beacon_loss);
1156
1157 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1158                                      struct ieee80211_mgd_work *wk)
1159 {
1160         wk->state = IEEE80211_MGD_STATE_IDLE;
1161         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1162 }
1163
1164
1165 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1166                                      struct ieee80211_mgd_work *wk,
1167                                      struct ieee80211_mgmt *mgmt,
1168                                      size_t len)
1169 {
1170         u8 *pos;
1171         struct ieee802_11_elems elems;
1172
1173         pos = mgmt->u.auth.variable;
1174         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1175         if (!elems.challenge)
1176                 return;
1177         ieee80211_send_auth(sdata, 3, wk->auth_alg,
1178                             elems.challenge - 2, elems.challenge_len + 2,
1179                             wk->bss->cbss.bssid, 1);
1180         wk->auth_transaction = 4;
1181 }
1182
1183 static enum rx_mgmt_action __must_check
1184 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1185                        struct ieee80211_mgd_work *wk,
1186                        struct ieee80211_mgmt *mgmt, size_t len)
1187 {
1188         u16 auth_alg, auth_transaction, status_code;
1189
1190         if (wk->state != IEEE80211_MGD_STATE_AUTH)
1191                 return RX_MGMT_NONE;
1192
1193         if (len < 24 + 6)
1194                 return RX_MGMT_NONE;
1195
1196         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1197                 return RX_MGMT_NONE;
1198
1199         if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1200                 return RX_MGMT_NONE;
1201
1202         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1203         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1204         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1205
1206         if (auth_alg != wk->auth_alg ||
1207             auth_transaction != wk->auth_transaction)
1208                 return RX_MGMT_NONE;
1209
1210         if (status_code != WLAN_STATUS_SUCCESS) {
1211                 list_del(&wk->list);
1212                 kfree(wk);
1213                 return RX_MGMT_CFG80211_AUTH;
1214         }
1215
1216         switch (wk->auth_alg) {
1217         case WLAN_AUTH_OPEN:
1218         case WLAN_AUTH_LEAP:
1219         case WLAN_AUTH_FT:
1220                 ieee80211_auth_completed(sdata, wk);
1221                 return RX_MGMT_CFG80211_AUTH;
1222         case WLAN_AUTH_SHARED_KEY:
1223                 if (wk->auth_transaction == 4) {
1224                         ieee80211_auth_completed(sdata, wk);
1225                         return RX_MGMT_CFG80211_AUTH;
1226                 } else
1227                         ieee80211_auth_challenge(sdata, wk, mgmt, len);
1228                 break;
1229         }
1230
1231         return RX_MGMT_NONE;
1232 }
1233
1234
1235 static enum rx_mgmt_action __must_check
1236 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1237                          struct ieee80211_mgd_work *wk,
1238                          struct ieee80211_mgmt *mgmt, size_t len)
1239 {
1240         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1241         const u8 *bssid = NULL;
1242         u16 reason_code;
1243
1244         if (len < 24 + 2)
1245                 return RX_MGMT_NONE;
1246
1247         ASSERT_MGD_MTX(ifmgd);
1248
1249         if (wk)
1250                 bssid = wk->bss->cbss.bssid;
1251         else
1252                 bssid = ifmgd->associated->cbss.bssid;
1253
1254         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1255
1256         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1257                         sdata->dev->name, bssid, reason_code);
1258
1259         if (!wk) {
1260                 ieee80211_set_disassoc(sdata, bssid, true);
1261         } else {
1262                 list_del(&wk->list);
1263                 kfree(wk);
1264         }
1265
1266         return RX_MGMT_CFG80211_DEAUTH;
1267 }
1268
1269
1270 static enum rx_mgmt_action __must_check
1271 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1272                            struct ieee80211_mgmt *mgmt, size_t len)
1273 {
1274         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1275         u16 reason_code;
1276
1277         if (len < 24 + 2)
1278                 return RX_MGMT_NONE;
1279
1280         ASSERT_MGD_MTX(ifmgd);
1281
1282         if (WARN_ON(!ifmgd->associated))
1283                 return RX_MGMT_NONE;
1284
1285         if (WARN_ON(memcmp(ifmgd->associated->cbss.bssid, mgmt->sa, ETH_ALEN)))
1286                 return RX_MGMT_NONE;
1287
1288         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1289
1290         printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1291                         sdata->dev->name, reason_code);
1292
1293         ieee80211_set_disassoc(sdata, ifmgd->associated->cbss.bssid, false);
1294         return RX_MGMT_CFG80211_DISASSOC;
1295 }
1296
1297
1298 static enum rx_mgmt_action __must_check
1299 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1300                              struct ieee80211_mgd_work *wk,
1301                              struct ieee80211_mgmt *mgmt, size_t len,
1302                              bool reassoc)
1303 {
1304         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1305         struct ieee80211_local *local = sdata->local;
1306         struct ieee80211_supported_band *sband;
1307         struct sta_info *sta;
1308         u32 rates, basic_rates;
1309         u16 capab_info, status_code, aid;
1310         struct ieee802_11_elems elems;
1311         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1312         u8 *pos;
1313         u32 changed = 0;
1314         int i, j;
1315         bool have_higher_than_11mbit = false, newsta = false;
1316         u16 ap_ht_cap_flags;
1317
1318         /*
1319          * AssocResp and ReassocResp have identical structure, so process both
1320          * of them in this function.
1321          */
1322
1323         if (len < 24 + 6)
1324                 return RX_MGMT_NONE;
1325
1326         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1327                 return RX_MGMT_NONE;
1328
1329         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1330         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1331         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1332
1333         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1334                "status=%d aid=%d)\n",
1335                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1336                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1337
1338         pos = mgmt->u.assoc_resp.variable;
1339         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1340
1341         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1342             elems.timeout_int && elems.timeout_int_len == 5 &&
1343             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1344                 u32 tu, ms;
1345                 tu = get_unaligned_le32(elems.timeout_int + 1);
1346                 ms = tu * 1024 / 1000;
1347                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1348                        "comeback duration %u TU (%u ms)\n",
1349                        sdata->dev->name, tu, ms);
1350                 wk->timeout = jiffies + msecs_to_jiffies(ms);
1351                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1352                         mod_timer(&ifmgd->timer,
1353                                   jiffies + msecs_to_jiffies(ms));
1354                 return RX_MGMT_NONE;
1355         }
1356
1357         if (status_code != WLAN_STATUS_SUCCESS) {
1358                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1359                        sdata->dev->name, status_code);
1360                 list_del(&wk->list);
1361                 kfree(wk);
1362                 return RX_MGMT_CFG80211_ASSOC;
1363         }
1364
1365         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1366                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1367                        "set\n", sdata->dev->name, aid);
1368         aid &= ~(BIT(15) | BIT(14));
1369
1370         if (!elems.supp_rates) {
1371                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1372                        sdata->dev->name);
1373                 return RX_MGMT_NONE;
1374         }
1375
1376         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1377         ifmgd->aid = aid;
1378
1379         rcu_read_lock();
1380
1381         /* Add STA entry for the AP */
1382         sta = sta_info_get(local, wk->bss->cbss.bssid);
1383         if (!sta) {
1384                 newsta = true;
1385
1386                 rcu_read_unlock();
1387
1388                 sta = sta_info_alloc(sdata, wk->bss->cbss.bssid, GFP_KERNEL);
1389                 if (!sta) {
1390                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1391                                " the AP\n", sdata->dev->name);
1392                         return RX_MGMT_NONE;
1393                 }
1394
1395                 /* update new sta with its last rx activity */
1396                 sta->last_rx = jiffies;
1397
1398                 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1399                                    WLAN_STA_ASSOC_AP);
1400                 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1401                         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1402
1403                 rcu_read_lock();
1404         }
1405
1406         rates = 0;
1407         basic_rates = 0;
1408         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1409
1410         for (i = 0; i < elems.supp_rates_len; i++) {
1411                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1412                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1413
1414                 if (rate > 110)
1415                         have_higher_than_11mbit = true;
1416
1417                 for (j = 0; j < sband->n_bitrates; j++) {
1418                         if (sband->bitrates[j].bitrate == rate) {
1419                                 rates |= BIT(j);
1420                                 if (is_basic)
1421                                         basic_rates |= BIT(j);
1422                                 break;
1423                         }
1424                 }
1425         }
1426
1427         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1428                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1429                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1430
1431                 if (rate > 110)
1432                         have_higher_than_11mbit = true;
1433
1434                 for (j = 0; j < sband->n_bitrates; j++) {
1435                         if (sband->bitrates[j].bitrate == rate) {
1436                                 rates |= BIT(j);
1437                                 if (is_basic)
1438                                         basic_rates |= BIT(j);
1439                                 break;
1440                         }
1441                 }
1442         }
1443
1444         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1445         sdata->vif.bss_conf.basic_rates = basic_rates;
1446
1447         /* cf. IEEE 802.11 9.2.12 */
1448         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1449             have_higher_than_11mbit)
1450                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1451         else
1452                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1453
1454         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1455                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1456                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1457
1458         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1459
1460         rate_control_rate_init(sta);
1461
1462         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1463                 set_sta_flags(sta, WLAN_STA_MFP);
1464
1465         if (elems.wmm_param)
1466                 set_sta_flags(sta, WLAN_STA_WME);
1467
1468         if (newsta) {
1469                 int err = sta_info_insert(sta);
1470                 if (err) {
1471                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1472                                " the AP (error %d)\n", sdata->dev->name, err);
1473                         rcu_read_unlock();
1474                         return RX_MGMT_NONE;
1475                 }
1476         }
1477
1478         rcu_read_unlock();
1479
1480         if (elems.wmm_param)
1481                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1482                                          elems.wmm_param_len);
1483         else
1484                 ieee80211_set_wmm_default(sdata);
1485
1486         if (elems.ht_info_elem && elems.wmm_param &&
1487             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1488             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1489                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1490                                                wk->bss->cbss.bssid,
1491                                                ap_ht_cap_flags);
1492
1493         /* set AID and assoc capability,
1494          * ieee80211_set_associated() will tell the driver */
1495         bss_conf->aid = aid;
1496         bss_conf->assoc_capability = capab_info;
1497         ieee80211_set_associated(sdata, wk->bss, changed);
1498
1499         /*
1500          * initialise the time of last beacon to be the association time,
1501          * otherwise beacon loss check will trigger immediately
1502          */
1503         ifmgd->last_beacon = jiffies;
1504
1505         list_del(&wk->list);
1506         kfree(wk);
1507         return RX_MGMT_CFG80211_ASSOC;
1508 }
1509
1510
1511 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1512                                   struct ieee80211_mgmt *mgmt,
1513                                   size_t len,
1514                                   struct ieee80211_rx_status *rx_status,
1515                                   struct ieee802_11_elems *elems,
1516                                   bool beacon)
1517 {
1518         struct ieee80211_local *local = sdata->local;
1519         int freq;
1520         struct ieee80211_bss *bss;
1521         struct ieee80211_channel *channel;
1522
1523         if (elems->ds_params && elems->ds_params_len == 1)
1524                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1525         else
1526                 freq = rx_status->freq;
1527
1528         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1529
1530         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1531                 return;
1532
1533         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1534                                         channel, beacon);
1535         if (bss)
1536                 ieee80211_rx_bss_put(local, bss);
1537
1538         if (!sdata->u.mgd.associated)
1539                 return;
1540
1541         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1542             (memcmp(mgmt->bssid, sdata->u.mgd.associated->cbss.bssid,
1543                                                         ETH_ALEN) == 0)) {
1544                 struct ieee80211_channel_sw_ie *sw_elem =
1545                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1546                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1547         }
1548 }
1549
1550
1551 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1552                                          struct ieee80211_mgd_work *wk,
1553                                          struct ieee80211_mgmt *mgmt, size_t len,
1554                                          struct ieee80211_rx_status *rx_status)
1555 {
1556         struct ieee80211_if_managed *ifmgd;
1557         size_t baselen;
1558         struct ieee802_11_elems elems;
1559
1560         ifmgd = &sdata->u.mgd;
1561
1562         ASSERT_MGD_MTX(ifmgd);
1563
1564         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1565                 return; /* ignore ProbeResp to foreign address */
1566
1567         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1568         if (baselen > len)
1569                 return;
1570
1571         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1572                                 &elems);
1573
1574         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1575
1576         /* direct probe may be part of the association flow */
1577         if (wk && wk->state == IEEE80211_MGD_STATE_PROBE) {
1578                 printk(KERN_DEBUG "%s direct probe responded\n",
1579                        sdata->dev->name);
1580                 wk->tries = 0;
1581                 wk->state = IEEE80211_MGD_STATE_AUTH;
1582                 WARN_ON(ieee80211_authenticate(sdata, wk) != RX_MGMT_NONE);
1583         }
1584
1585         if (ifmgd->associated &&
1586             memcmp(mgmt->bssid, ifmgd->associated->cbss.bssid, ETH_ALEN) == 0 &&
1587             ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
1588                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1589                 mutex_lock(&sdata->local->iflist_mtx);
1590                 ieee80211_recalc_ps(sdata->local, -1);
1591                 mutex_unlock(&sdata->local->iflist_mtx);
1592         }
1593 }
1594
1595 /*
1596  * This is the canonical list of information elements we care about,
1597  * the filter code also gives us all changes to the Microsoft OUI
1598  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1599  *
1600  * We implement beacon filtering in software since that means we can
1601  * avoid processing the frame here and in cfg80211, and userspace
1602  * will not be able to tell whether the hardware supports it or not.
1603  *
1604  * XXX: This list needs to be dynamic -- userspace needs to be able to
1605  *      add items it requires. It also needs to be able to tell us to
1606  *      look out for other vendor IEs.
1607  */
1608 static const u64 care_about_ies =
1609         (1ULL << WLAN_EID_COUNTRY) |
1610         (1ULL << WLAN_EID_ERP_INFO) |
1611         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1612         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1613         (1ULL << WLAN_EID_HT_CAPABILITY) |
1614         (1ULL << WLAN_EID_HT_INFORMATION);
1615
1616 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1617                                      struct ieee80211_mgmt *mgmt,
1618                                      size_t len,
1619                                      struct ieee80211_rx_status *rx_status)
1620 {
1621         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1622         size_t baselen;
1623         struct ieee802_11_elems elems;
1624         struct ieee80211_local *local = sdata->local;
1625         u32 changed = 0;
1626         bool erp_valid, directed_tim = false;
1627         u8 erp_value = 0;
1628         u32 ncrc;
1629         u8 *bssid;
1630
1631         ASSERT_MGD_MTX(ifmgd);
1632
1633         /* Process beacon from the current BSS */
1634         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1635         if (baselen > len)
1636                 return;
1637
1638         if (rx_status->freq != local->hw.conf.channel->center_freq)
1639                 return;
1640
1641         if (WARN_ON(!ifmgd->associated))
1642                 return;
1643
1644         bssid = ifmgd->associated->cbss.bssid;
1645
1646         if (WARN_ON(memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0))
1647                 return;
1648
1649         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
1650 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1651                 if (net_ratelimit()) {
1652                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1653                                "to a received beacon\n", sdata->dev->name);
1654                 }
1655 #endif
1656                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1657                 mutex_lock(&local->iflist_mtx);
1658                 ieee80211_recalc_ps(local, -1);
1659                 mutex_unlock(&local->iflist_mtx);
1660         }
1661
1662         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1663         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1664                                           len - baselen, &elems,
1665                                           care_about_ies, ncrc);
1666
1667         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1668                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1669                                                    ifmgd->aid);
1670
1671         if (ncrc != ifmgd->beacon_crc) {
1672                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1673                                       true);
1674
1675                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1676                                          elems.wmm_param_len);
1677         }
1678
1679         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1680                 if (directed_tim) {
1681                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1682                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1683                                 ieee80211_hw_config(local,
1684                                                     IEEE80211_CONF_CHANGE_PS);
1685                                 ieee80211_send_nullfunc(local, sdata, 0);
1686                         } else {
1687                                 local->pspolling = true;
1688
1689                                 /*
1690                                  * Here is assumed that the driver will be
1691                                  * able to send ps-poll frame and receive a
1692                                  * response even though power save mode is
1693                                  * enabled, but some drivers might require
1694                                  * to disable power save here. This needs
1695                                  * to be investigated.
1696                                  */
1697                                 ieee80211_send_pspoll(local, sdata);
1698                         }
1699                 }
1700         }
1701
1702         if (ncrc == ifmgd->beacon_crc)
1703                 return;
1704         ifmgd->beacon_crc = ncrc;
1705
1706         if (elems.erp_info && elems.erp_info_len >= 1) {
1707                 erp_valid = true;
1708                 erp_value = elems.erp_info[0];
1709         } else {
1710                 erp_valid = false;
1711         }
1712         changed |= ieee80211_handle_bss_capability(sdata,
1713                         le16_to_cpu(mgmt->u.beacon.capab_info),
1714                         erp_valid, erp_value);
1715
1716
1717         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1718             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1719                 struct sta_info *sta;
1720                 struct ieee80211_supported_band *sband;
1721                 u16 ap_ht_cap_flags;
1722
1723                 rcu_read_lock();
1724
1725                 sta = sta_info_get(local, bssid);
1726                 if (WARN_ON(!sta)) {
1727                         rcu_read_unlock();
1728                         return;
1729                 }
1730
1731                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1732
1733                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1734                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1735
1736                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1737
1738                 rcu_read_unlock();
1739
1740                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1741                                                bssid, ap_ht_cap_flags);
1742         }
1743
1744         if (elems.country_elem) {
1745                 /* Note we are only reviewing this on beacons
1746                  * for the BSSID we are associated to */
1747                 regulatory_hint_11d(local->hw.wiphy,
1748                         elems.country_elem, elems.country_elem_len);
1749
1750                 /* TODO: IBSS also needs this */
1751                 if (elems.pwr_constr_elem)
1752                         ieee80211_handle_pwr_constr(sdata,
1753                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1754                                 elems.pwr_constr_elem,
1755                                 elems.pwr_constr_elem_len);
1756         }
1757
1758         ieee80211_bss_info_change_notify(sdata, changed);
1759 }
1760
1761 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1762                                           struct sk_buff *skb)
1763 {
1764         struct ieee80211_local *local = sdata->local;
1765         struct ieee80211_mgmt *mgmt;
1766         u16 fc;
1767
1768         if (skb->len < 24)
1769                 return RX_DROP_MONITOR;
1770
1771         mgmt = (struct ieee80211_mgmt *) skb->data;
1772         fc = le16_to_cpu(mgmt->frame_control);
1773
1774         switch (fc & IEEE80211_FCTL_STYPE) {
1775         case IEEE80211_STYPE_PROBE_REQ:
1776         case IEEE80211_STYPE_PROBE_RESP:
1777         case IEEE80211_STYPE_BEACON:
1778         case IEEE80211_STYPE_AUTH:
1779         case IEEE80211_STYPE_ASSOC_RESP:
1780         case IEEE80211_STYPE_REASSOC_RESP:
1781         case IEEE80211_STYPE_DEAUTH:
1782         case IEEE80211_STYPE_DISASSOC:
1783         case IEEE80211_STYPE_ACTION:
1784                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1785                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1786                 return RX_QUEUED;
1787         }
1788
1789         return RX_DROP_MONITOR;
1790 }
1791
1792 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1793                                          struct sk_buff *skb)
1794 {
1795         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1796         struct ieee80211_rx_status *rx_status;
1797         struct ieee80211_mgmt *mgmt;
1798         struct ieee80211_mgd_work *wk;
1799         enum rx_mgmt_action rma = RX_MGMT_NONE;
1800         u16 fc;
1801
1802         rx_status = (struct ieee80211_rx_status *) skb->cb;
1803         mgmt = (struct ieee80211_mgmt *) skb->data;
1804         fc = le16_to_cpu(mgmt->frame_control);
1805
1806         mutex_lock(&ifmgd->mtx);
1807
1808         if (ifmgd->associated &&
1809             memcmp(ifmgd->associated->cbss.bssid, mgmt->bssid,
1810                                                         ETH_ALEN) == 0) {
1811                 switch (fc & IEEE80211_FCTL_STYPE) {
1812                 case IEEE80211_STYPE_BEACON:
1813                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1814                                                  rx_status);
1815                         break;
1816                 case IEEE80211_STYPE_PROBE_RESP:
1817                         ieee80211_rx_mgmt_probe_resp(sdata, NULL, mgmt,
1818                                                      skb->len, rx_status);
1819                         break;
1820                 case IEEE80211_STYPE_DEAUTH:
1821                         rma = ieee80211_rx_mgmt_deauth(sdata, NULL,
1822                                                        mgmt, skb->len);
1823                         break;
1824                 case IEEE80211_STYPE_DISASSOC:
1825                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1826                         break;
1827                 case IEEE80211_STYPE_ACTION:
1828                         /* XXX: differentiate, can only happen for CSA now! */
1829                         ieee80211_sta_process_chanswitch(sdata,
1830                                         &mgmt->u.action.u.chan_switch.sw_elem,
1831                                         ifmgd->associated);
1832                         break;
1833                 }
1834                 mutex_unlock(&ifmgd->mtx);
1835
1836                 switch (rma) {
1837                 case RX_MGMT_NONE:
1838                         /* no action */
1839                         break;
1840                 case RX_MGMT_CFG80211_DEAUTH:
1841                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len,
1842                                              NULL);
1843                         break;
1844                 case RX_MGMT_CFG80211_DISASSOC:
1845                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len,
1846                                                NULL);
1847                         break;
1848                 default:
1849                         WARN(1, "unexpected: %d", rma);
1850                 }
1851                 goto out;
1852         }
1853
1854         list_for_each_entry(wk, &ifmgd->work_list, list) {
1855                 if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1856                         continue;
1857
1858                 switch (fc & IEEE80211_FCTL_STYPE) {
1859                 case IEEE80211_STYPE_PROBE_RESP:
1860                         ieee80211_rx_mgmt_probe_resp(sdata, wk, mgmt, skb->len,
1861                                                      rx_status);
1862                         break;
1863                 case IEEE80211_STYPE_AUTH:
1864                         rma = ieee80211_rx_mgmt_auth(sdata, wk, mgmt, skb->len);
1865                         break;
1866                 case IEEE80211_STYPE_ASSOC_RESP:
1867                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
1868                                                            skb->len, false);
1869                         break;
1870                 case IEEE80211_STYPE_REASSOC_RESP:
1871                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
1872                                                            skb->len, true);
1873                         break;
1874                 case IEEE80211_STYPE_DEAUTH:
1875                         rma = ieee80211_rx_mgmt_deauth(sdata, wk, mgmt,
1876                                                        skb->len);
1877                         break;
1878                 }
1879                 /*
1880                  * We've processed this frame for that work, so it can't
1881                  * belong to another work struct.
1882                  * NB: this is also required for correctness because the
1883                  * called functions can free 'wk', and for 'rma'!
1884                  */
1885                 break;
1886         }
1887
1888         mutex_unlock(&ifmgd->mtx);
1889
1890         switch (rma) {
1891         case RX_MGMT_NONE:
1892                 /* no action */
1893                 break;
1894         case RX_MGMT_CFG80211_AUTH:
1895                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, skb->len);
1896                 break;
1897         case RX_MGMT_CFG80211_ASSOC:
1898                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, skb->len);
1899                 break;
1900         default:
1901                 WARN(1, "unexpected: %d", rma);
1902         }
1903
1904  out:
1905         kfree_skb(skb);
1906 }
1907
1908 static void ieee80211_sta_timer(unsigned long data)
1909 {
1910         struct ieee80211_sub_if_data *sdata =
1911                 (struct ieee80211_sub_if_data *) data;
1912         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1913         struct ieee80211_local *local = sdata->local;
1914
1915         if (local->quiescing) {
1916                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1917                 return;
1918         }
1919
1920         queue_work(local->hw.workqueue, &ifmgd->work);
1921 }
1922
1923 static void ieee80211_sta_work(struct work_struct *work)
1924 {
1925         struct ieee80211_sub_if_data *sdata =
1926                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1927         struct ieee80211_local *local = sdata->local;
1928         struct ieee80211_if_managed *ifmgd;
1929         struct sk_buff *skb;
1930         struct ieee80211_mgd_work *wk, *tmp;
1931         LIST_HEAD(free_work);
1932         enum rx_mgmt_action rma;
1933         bool anybusy = false;
1934
1935         if (!netif_running(sdata->dev))
1936                 return;
1937
1938         if (local->sw_scanning || local->hw_scanning)
1939                 return;
1940
1941         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1942                 return;
1943
1944         /*
1945          * Nothing should have been stuffed into the workqueue during
1946          * the suspend->resume cycle. If this WARN is seen then there
1947          * is a bug with either the driver suspend or something in
1948          * mac80211 stuffing into the workqueue which we haven't yet
1949          * cleared during mac80211's suspend cycle.
1950          */
1951         if (WARN_ON(local->suspended))
1952                 return;
1953
1954         ifmgd = &sdata->u.mgd;
1955
1956         /* first process frames to avoid timing out while a frame is pending */
1957         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1958                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1959
1960         /* then process the rest of the work */
1961         mutex_lock(&ifmgd->mtx);
1962
1963         list_for_each_entry(wk, &ifmgd->work_list, list) {
1964                 if (wk->state != IEEE80211_MGD_STATE_IDLE) {
1965                         anybusy = true;
1966                         break;
1967                 }
1968         }
1969
1970         ieee80211_recalc_idle(local);
1971
1972         if (!anybusy) {
1973                 mutex_unlock(&ifmgd->mtx);
1974
1975                 if (test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request))
1976                         queue_delayed_work(local->hw.workqueue,
1977                                            &local->scan_work,
1978                                            round_jiffies_relative(0));
1979                 return;
1980         }
1981
1982         list_for_each_entry_safe(wk, tmp, &ifmgd->work_list, list) {
1983                 if (time_before(jiffies, wk->timeout))
1984                         continue;
1985
1986                 switch (wk->state) {
1987                 default:
1988                         WARN_ON(1);
1989                         /* fall through */
1990                 case IEEE80211_MGD_STATE_IDLE:
1991                         /* nothing */
1992                         rma = RX_MGMT_NONE;
1993                         break;
1994                 case IEEE80211_MGD_STATE_PROBE:
1995                         rma = ieee80211_direct_probe(sdata, wk);
1996                         break;
1997                 case IEEE80211_MGD_STATE_AUTH:
1998                         rma = ieee80211_authenticate(sdata, wk);
1999                         break;
2000                 case IEEE80211_MGD_STATE_ASSOC:
2001                         rma = ieee80211_associate(sdata, wk);
2002                         break;
2003                 }
2004
2005                 switch (rma) {
2006                 case RX_MGMT_NONE:
2007                         /* no action required */
2008                         break;
2009                 case RX_MGMT_CFG80211_AUTH_TO:
2010                 case RX_MGMT_CFG80211_ASSOC_TO:
2011                         list_del(&wk->list);
2012                         list_add(&wk->list, &free_work);
2013                         wk->tries = rma; /* small abuse but only local */
2014                         break;
2015                 default:
2016                         WARN(1, "unexpected: %d", rma);
2017                 }
2018         }
2019
2020         mutex_unlock(&ifmgd->mtx);
2021
2022         list_for_each_entry_safe(wk, tmp, &free_work, list) {
2023                 switch (wk->tries) {
2024                 case RX_MGMT_CFG80211_AUTH_TO:
2025                         cfg80211_send_auth_timeout(sdata->dev,
2026                                                    wk->bss->cbss.bssid);
2027                         break;
2028                 case RX_MGMT_CFG80211_ASSOC_TO:
2029                         cfg80211_send_assoc_timeout(sdata->dev,
2030                                                     wk->bss->cbss.bssid);
2031                         break;
2032                 default:
2033                         WARN(1, "unexpected: %d", wk->tries);
2034                 }
2035
2036                 list_del(&wk->list);
2037                 kfree(wk);
2038         }
2039
2040         ieee80211_recalc_idle(local);
2041 }
2042
2043 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2044 {
2045         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2046                 /*
2047                  * Need to update last_beacon to avoid beacon loss
2048                  * test to trigger.
2049                  */
2050                 sdata->u.mgd.last_beacon = jiffies;
2051
2052                 queue_work(sdata->local->hw.workqueue,
2053                            &sdata->u.mgd.work);
2054         }
2055 }
2056
2057 #ifdef CONFIG_PM
2058 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2059 {
2060         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2061
2062         /*
2063          * we need to use atomic bitops for the running bits
2064          * only because both timers might fire at the same
2065          * time -- the code here is properly synchronised.
2066          */
2067
2068         cancel_work_sync(&ifmgd->work);
2069         cancel_work_sync(&ifmgd->beacon_loss_work);
2070         if (del_timer_sync(&ifmgd->timer))
2071                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2072
2073         cancel_work_sync(&ifmgd->chswitch_work);
2074         if (del_timer_sync(&ifmgd->chswitch_timer))
2075                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2076 }
2077
2078 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2079 {
2080         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2081
2082         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2083                 add_timer(&ifmgd->timer);
2084         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2085                 add_timer(&ifmgd->chswitch_timer);
2086 }
2087 #endif
2088
2089 /* interface setup */
2090 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2091 {
2092         struct ieee80211_if_managed *ifmgd;
2093
2094         ifmgd = &sdata->u.mgd;
2095         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2096         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2097         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2098         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2099                     (unsigned long) sdata);
2100         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2101                     (unsigned long) sdata);
2102         skb_queue_head_init(&ifmgd->skb_queue);
2103
2104         INIT_LIST_HEAD(&ifmgd->work_list);
2105
2106         ifmgd->capab = WLAN_CAPABILITY_ESS;
2107         ifmgd->flags = 0;
2108         if (sdata->local->hw.queues >= 4)
2109                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2110
2111         mutex_init(&ifmgd->mtx);
2112 }
2113
2114 /* scan finished notification */
2115 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2116 {
2117         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2118
2119         /* Restart STA timers */
2120         rcu_read_lock();
2121         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2122                 ieee80211_restart_sta_timer(sdata);
2123         rcu_read_unlock();
2124 }
2125
2126 int ieee80211_max_network_latency(struct notifier_block *nb,
2127                                   unsigned long data, void *dummy)
2128 {
2129         s32 latency_usec = (s32) data;
2130         struct ieee80211_local *local =
2131                 container_of(nb, struct ieee80211_local,
2132                              network_latency_notifier);
2133
2134         mutex_lock(&local->iflist_mtx);
2135         ieee80211_recalc_ps(local, latency_usec);
2136         mutex_unlock(&local->iflist_mtx);
2137
2138         return 0;
2139 }
2140
2141 /* config hooks */
2142 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2143                        struct cfg80211_auth_request *req)
2144 {
2145         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2146         const u8 *ssid;
2147         struct ieee80211_mgd_work *wk;
2148         u16 auth_alg;
2149
2150         switch (req->auth_type) {
2151         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2152                 auth_alg = WLAN_AUTH_OPEN;
2153                 break;
2154         case NL80211_AUTHTYPE_SHARED_KEY:
2155                 auth_alg = WLAN_AUTH_SHARED_KEY;
2156                 break;
2157         case NL80211_AUTHTYPE_FT:
2158                 auth_alg = WLAN_AUTH_FT;
2159                 break;
2160         case NL80211_AUTHTYPE_NETWORK_EAP:
2161                 auth_alg = WLAN_AUTH_LEAP;
2162                 break;
2163         default:
2164                 return -EOPNOTSUPP;
2165         }
2166
2167         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2168         if (!wk)
2169                 return -ENOMEM;
2170
2171         wk->bss = (void *)req->bss;
2172
2173         if (req->ie && req->ie_len) {
2174                 memcpy(wk->ie, req->ie, req->ie_len);
2175                 wk->ie_len = req->ie_len;
2176         }
2177
2178         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2179         memcpy(wk->ssid, ssid + 2, ssid[1]);
2180         wk->ssid_len = ssid[1];
2181
2182         wk->state = IEEE80211_MGD_STATE_PROBE;
2183         wk->auth_alg = auth_alg;
2184
2185         /*
2186          * XXX: if still associated need to tell AP that we're going
2187          *      to sleep and then change channel etc.
2188          */
2189         sdata->local->oper_channel = req->bss->channel;
2190         ieee80211_hw_config(sdata->local, 0);
2191
2192         mutex_lock(&ifmgd->mtx);
2193         list_add(&wk->list, &sdata->u.mgd.work_list);
2194         mutex_unlock(&ifmgd->mtx);
2195
2196         queue_work(sdata->local->hw.workqueue, &sdata->u.mgd.work);
2197         return 0;
2198 }
2199
2200 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2201                         struct cfg80211_assoc_request *req)
2202 {
2203         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2204         struct ieee80211_mgd_work *wk, *found = NULL;
2205         int i, err;
2206
2207         mutex_lock(&ifmgd->mtx);
2208
2209         list_for_each_entry(wk, &ifmgd->work_list, list) {
2210                 if (&wk->bss->cbss == req->bss &&
2211                     wk->state == IEEE80211_MGD_STATE_IDLE) {
2212                         found = wk;
2213                         break;
2214                 }
2215         }
2216
2217         if (!found) {
2218                 err = -ENOLINK;
2219                 goto out;
2220         }
2221
2222         list_del(&found->list);
2223
2224         wk = krealloc(found, sizeof(*wk) + req->ie_len, GFP_KERNEL);
2225         if (!wk) {
2226                 list_add(&found->list, &ifmgd->work_list);
2227                 err = -ENOMEM;
2228                 goto out;
2229         }
2230
2231         list_add(&wk->list, &ifmgd->work_list);
2232
2233         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2234
2235         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2236                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2237                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2238                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2239                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2240
2241         sdata->local->oper_channel = req->bss->channel;
2242         ieee80211_hw_config(sdata->local, 0);
2243
2244         if (req->ie && req->ie_len) {
2245                 memcpy(wk->ie, req->ie, req->ie_len);
2246                 wk->ie_len = req->ie_len;
2247         } else
2248                 wk->ie_len = 0;
2249
2250         if (req->prev_bssid)
2251                 memcpy(wk->prev_bssid, req->prev_bssid, ETH_ALEN);
2252
2253         wk->state = IEEE80211_MGD_STATE_ASSOC;
2254         wk->tries = 0;
2255
2256         if (req->use_mfp) {
2257                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2258                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2259         } else {
2260                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2261                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2262         }
2263
2264         if (req->crypto.control_port)
2265                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2266         else
2267                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2268
2269         queue_work(sdata->local->hw.workqueue, &sdata->u.mgd.work);
2270
2271         err = 0;
2272
2273  out:
2274         mutex_unlock(&ifmgd->mtx);
2275         return err;
2276 }
2277
2278 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2279                          struct cfg80211_deauth_request *req,
2280                          void *cookie)
2281 {
2282         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2283         struct ieee80211_mgd_work *wk;
2284         const u8 *bssid = NULL;
2285
2286         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2287                sdata->dev->name, req->reason_code);
2288
2289         mutex_lock(&ifmgd->mtx);
2290
2291         if (ifmgd->associated && &ifmgd->associated->cbss == req->bss) {
2292                 bssid = req->bss->bssid;
2293                 ieee80211_set_disassoc(sdata, bssid, true);
2294         } else list_for_each_entry(wk, &ifmgd->work_list, list) {
2295                 if (&wk->bss->cbss == req->bss) {
2296                         bssid = req->bss->bssid;
2297                         list_del(&wk->list);
2298                         kfree(wk);
2299                         break;
2300                 }
2301         }
2302
2303         /* cfg80211 should catch this... */
2304         if (WARN_ON(!bssid)) {
2305                 mutex_unlock(&ifmgd->mtx);
2306                 return -ENOLINK;
2307         }
2308
2309         mutex_unlock(&ifmgd->mtx);
2310
2311         ieee80211_send_deauth_disassoc(sdata, bssid,
2312                         IEEE80211_STYPE_DEAUTH, req->reason_code,
2313                         cookie);
2314
2315         return 0;
2316 }
2317
2318 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2319                            struct cfg80211_disassoc_request *req,
2320                            void *cookie)
2321 {
2322         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2323
2324         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2325                sdata->dev->name, req->reason_code);
2326
2327         mutex_lock(&ifmgd->mtx);
2328
2329         /* cfg80211 should catch that */
2330         if (WARN_ON(&ifmgd->associated->cbss != req->bss)) {
2331                 mutex_unlock(&ifmgd->mtx);
2332                 return -ENOLINK;
2333         }
2334
2335         ieee80211_set_disassoc(sdata, req->bss->bssid, false);
2336
2337         mutex_unlock(&ifmgd->mtx);
2338
2339         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2340                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2341                         cookie);
2342         return 0;
2343 }