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_ASSOC_SCANS_MAX_TRIES 2
  31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  32 #define IEEE80211_AUTH_MAX_TRIES 3
  33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  34 #define IEEE80211_ASSOC_MAX_TRIES 3
  35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  36 #define IEEE80211_PROBE_IDLE_TIME (60 * HZ)
  37 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  38
  39 /* utils */
  40 static int ecw2cw(int ecw)
  41 {
  42         return (1 << ecw) - 1;
  43 }
  44
  45 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  46 {
  47         u8 *end, *pos;
  48
  49         pos = bss->cbss.information_elements;
  50         if (pos == NULL)
  51                 return NULL;
  52         end = pos + bss->cbss.len_information_elements;
  53
  54         while (pos + 1 < end) {
  55                 if (pos + 2 + pos[1] > end)
  56                         break;
  57                 if (pos[0] == ie)
  58                         return pos;
  59                 pos += 2 + pos[1];
  60         }
  61
  62         return NULL;
  63 }
  64
  65 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  66                                       struct ieee80211_supported_band *sband,
  67                                       u32 *rates)
  68 {
  69         int i, j, count;
  70         *rates = 0;
  71         count = 0;
  72         for (i = 0; i < bss->supp_rates_len; i++) {
  73                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  74
  75                 for (j = 0; j < sband->n_bitrates; j++)
  76                         if (sband->bitrates[j].bitrate == rate) {
  77                                 *rates |= BIT(j);
  78                                 count++;
  79                                 break;
  80                         }
  81         }
  82
  83         return count;
  84 }
  85
  86 /*
  87  * ieee80211_enable_ht should be called only after the operating band
  88  * has been determined as ht configuration depends on the hw's
  89  * HT abilities for a specific band.
  90  */
  91 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
  92                                struct ieee80211_ht_info *hti,
  93                                u16 ap_ht_cap_flags)
  94 {
  95         struct ieee80211_local *local = sdata->local;
  96         struct ieee80211_supported_band *sband;
  97         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  98         struct ieee80211_bss_ht_conf ht;
  99         struct sta_info *sta;
 100         u32 changed = 0;
 101         bool enable_ht = true, ht_changed;
 102         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 103
 104         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 105
 106         memset(&ht, 0, sizeof(ht));
 107
 108         /* HT is not supported */
 109         if (!sband->ht_cap.ht_supported)
 110                 enable_ht = false;
 111
 112         /* check that channel matches the right operating channel */
 113         if (local->hw.conf.channel->center_freq !=
 114             ieee80211_channel_to_frequency(hti->control_chan))
 115                 enable_ht = false;
 116
 117         if (enable_ht) {
 118                 channel_type = NL80211_CHAN_HT20;
 119
 120                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 121                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 122                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 123                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 124                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 125                                 channel_type = NL80211_CHAN_HT40PLUS;
 126                                 break;
 127                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 128                                 channel_type = NL80211_CHAN_HT40MINUS;
 129                                 break;
 130                         }
 131                 }
 132         }
 133
 134         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 135                      channel_type != local->hw.conf.channel_type;
 136
 137         local->oper_channel_type = channel_type;
 138
 139         if (ht_changed) {
 140                 /* channel_type change automatically detected */
 141                 ieee80211_hw_config(local, 0);
 142
 143                 rcu_read_lock();
 144
 145                 sta = sta_info_get(local, ifmgd->bssid);
 146                 if (sta)
 147                         rate_control_rate_update(local, sband, sta,
 148                                                  IEEE80211_RC_HT_CHANGED);
 149
 150                 rcu_read_unlock();
 151
 152         }
 153
 154         /* disable HT */
 155         if (!enable_ht)
 156                 return 0;
 157
 158         ht.operation_mode = le16_to_cpu(hti->operation_mode);
 159
 160         /* if bss configuration changed store the new one */
 161         if (memcmp(&sdata->vif.bss_conf.ht, &ht, sizeof(ht))) {
 162                 changed |= BSS_CHANGED_HT;
 163                 sdata->vif.bss_conf.ht = ht;
 164         }
 165
 166         return changed;
 167 }
 168
 169 /* frame sending functions */
 170
 171 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 172 {
 173         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 174         struct ieee80211_local *local = sdata->local;
 175         struct sk_buff *skb;
 176         struct ieee80211_mgmt *mgmt;
 177         u8 *pos, *ies, *ht_ie;
 178         int i, len, count, rates_len, supp_rates_len;
 179         u16 capab;
 180         struct ieee80211_bss *bss;
 181         int wmm = 0;
 182         struct ieee80211_supported_band *sband;
 183         u32 rates = 0;
 184
 185         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 186                             sizeof(*mgmt) + 200 + ifmgd->extra_ie_len +
 187                             ifmgd->ssid_len);
 188         if (!skb) {
 189                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 190                        "frame\n", sdata->dev->name);
 191                 return;
 192         }
 193         skb_reserve(skb, local->hw.extra_tx_headroom);
 194
 195         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 196
 197         capab = ifmgd->capab;
 198
 199         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 200                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 201                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 202                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 203                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 204         }
 205
 206         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 207                                    local->hw.conf.channel->center_freq,
 208                                    ifmgd->ssid, ifmgd->ssid_len);
 209         if (bss) {
 210                 if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
 211                         capab |= WLAN_CAPABILITY_PRIVACY;
 212                 if (bss->wmm_used)
 213                         wmm = 1;
 214
 215                 /* get all rates supported by the device and the AP as
 216                  * some APs don't like getting a superset of their rates
 217                  * in the association request (e.g. D-Link DAP 1353 in
 218                  * b-only mode) */
 219                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 220
 221                 if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 222                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 223                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 224
 225                 ieee80211_rx_bss_put(local, bss);
 226         } else {
 227                 rates = ~0;
 228                 rates_len = sband->n_bitrates;
 229         }
 230
 231         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 232         memset(mgmt, 0, 24);
 233         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 234         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 235         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 236
 237         if (ifmgd->flags & IEEE80211_STA_PREV_BSSID_SET) {
 238                 skb_put(skb, 10);
 239                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 240                                                   IEEE80211_STYPE_REASSOC_REQ);
 241                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 242                 mgmt->u.reassoc_req.listen_interval =
 243                                 cpu_to_le16(local->hw.conf.listen_interval);
 244                 memcpy(mgmt->u.reassoc_req.current_ap, ifmgd->prev_bssid,
 245                        ETH_ALEN);
 246         } else {
 247                 skb_put(skb, 4);
 248                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 249                                                   IEEE80211_STYPE_ASSOC_REQ);
 250                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 251                 mgmt->u.assoc_req.listen_interval =
 252                                 cpu_to_le16(local->hw.conf.listen_interval);
 253         }
 254
 255         /* SSID */
 256         ies = pos = skb_put(skb, 2 + ifmgd->ssid_len);
 257         *pos++ = WLAN_EID_SSID;
 258         *pos++ = ifmgd->ssid_len;
 259         memcpy(pos, ifmgd->ssid, ifmgd->ssid_len);
 260
 261         /* add all rates which were marked to be used above */
 262         supp_rates_len = rates_len;
 263         if (supp_rates_len > 8)
 264                 supp_rates_len = 8;
 265
 266         len = sband->n_bitrates;
 267         pos = skb_put(skb, supp_rates_len + 2);
 268         *pos++ = WLAN_EID_SUPP_RATES;
 269         *pos++ = supp_rates_len;
 270
 271         count = 0;
 272         for (i = 0; i < sband->n_bitrates; i++) {
 273                 if (BIT(i) & rates) {
 274                         int rate = sband->bitrates[i].bitrate;
 275                         *pos++ = (u8) (rate / 5);
 276                         if (++count == 8)
 277                                 break;
 278                 }
 279         }
 280
 281         if (rates_len > count) {
 282                 pos = skb_put(skb, rates_len - count + 2);
 283                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 284                 *pos++ = rates_len - count;
 285
 286                 for (i++; i < sband->n_bitrates; i++) {
 287                         if (BIT(i) & rates) {
 288                                 int rate = sband->bitrates[i].bitrate;
 289                                 *pos++ = (u8) (rate / 5);
 290                         }
 291                 }
 292         }
 293
 294         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 295                 /* 1. power capabilities */
 296                 pos = skb_put(skb, 4);
 297                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 298                 *pos++ = 2;
 299                 *pos++ = 0; /* min tx power */
 300                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 301
 302                 /* 2. supported channels */
 303                 /* TODO: get this in reg domain format */
 304                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 305                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 306                 *pos++ = 2 * sband->n_channels;
 307                 for (i = 0; i < sband->n_channels; i++) {
 308                         *pos++ = ieee80211_frequency_to_channel(
 309                                         sband->channels[i].center_freq);
 310                         *pos++ = 1; /* one channel in the subband*/
 311                 }
 312         }
 313
 314         if (ifmgd->extra_ie) {
 315                 pos = skb_put(skb, ifmgd->extra_ie_len);
 316                 memcpy(pos, ifmgd->extra_ie, ifmgd->extra_ie_len);
 317         }
 318
 319         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
 320                 pos = skb_put(skb, 9);
 321                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 322                 *pos++ = 7; /* len */
 323                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 324                 *pos++ = 0x50;
 325                 *pos++ = 0xf2;
 326                 *pos++ = 2; /* WME */
 327                 *pos++ = 0; /* WME info */
 328                 *pos++ = 1; /* WME ver */
 329                 *pos++ = 0;
 330         }
 331
 332         /* wmm support is a must to HT */
 333         /*
 334          * IEEE802.11n does not allow TKIP/WEP as pairwise
 335          * ciphers in HT mode. We still associate in non-ht
 336          * mode (11a/b/g) if any one of these ciphers is
 337          * configured as pairwise.
 338          */
 339         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
 340             sband->ht_cap.ht_supported &&
 341             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
 342             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 343             (!(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))) {
 344                 struct ieee80211_ht_info *ht_info =
 345                         (struct ieee80211_ht_info *)(ht_ie + 2);
 346                 u16 cap = sband->ht_cap.cap;
 347                 __le16 tmp;
 348                 u32 flags = local->hw.conf.channel->flags;
 349
 350                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 351                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 352                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 353                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 354                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 355                         }
 356                         break;
 357                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 358                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 359                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 360                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 361                         }
 362                         break;
 363                 }
 364
 365                 tmp = cpu_to_le16(cap);
 366                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 367                 *pos++ = WLAN_EID_HT_CAPABILITY;
 368                 *pos++ = sizeof(struct ieee80211_ht_cap);
 369                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 370                 memcpy(pos, &tmp, sizeof(u16));
 371                 pos += sizeof(u16);
 372                 /* TODO: needs a define here for << 2 */
 373                 *pos++ = sband->ht_cap.ampdu_factor |
 374                          (sband->ht_cap.ampdu_density << 2);
 375                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 376         }
 377
 378         kfree(ifmgd->assocreq_ies);
 379         ifmgd->assocreq_ies_len = (skb->data + skb->len) - ies;
 380         ifmgd->assocreq_ies = kmalloc(ifmgd->assocreq_ies_len, GFP_KERNEL);
 381         if (ifmgd->assocreq_ies)
 382                 memcpy(ifmgd->assocreq_ies, ies, ifmgd->assocreq_ies_len);
 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                                            u16 stype, u16 reason)
 390 {
 391         struct ieee80211_local *local = sdata->local;
 392         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 393         struct sk_buff *skb;
 394         struct ieee80211_mgmt *mgmt;
 395
 396         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 397         if (!skb) {
 398                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 399                        "deauth/disassoc frame\n", sdata->dev->name);
 400                 return;
 401         }
 402         skb_reserve(skb, local->hw.extra_tx_headroom);
 403
 404         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 405         memset(mgmt, 0, 24);
 406         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 407         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 408         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 409         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 410         skb_put(skb, 2);
 411         /* u.deauth.reason_code == u.disassoc.reason_code */
 412         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 413
 414         if (stype == IEEE80211_STYPE_DEAUTH)
 415                 cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, skb->len);
 416         else
 417                 cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, skb->len);
 418         ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
 419 }
 420
 421 void ieee80211_send_pspoll(struct ieee80211_local *local,
 422                            struct ieee80211_sub_if_data *sdata)
 423 {
 424         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 425         struct ieee80211_pspoll *pspoll;
 426         struct sk_buff *skb;
 427         u16 fc;
 428
 429         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 430         if (!skb) {
 431                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 432                        "pspoll frame\n", sdata->dev->name);
 433                 return;
 434         }
 435         skb_reserve(skb, local->hw.extra_tx_headroom);
 436
 437         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 438         memset(pspoll, 0, sizeof(*pspoll));
 439         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 440         pspoll->frame_control = cpu_to_le16(fc);
 441         pspoll->aid = cpu_to_le16(ifmgd->aid);
 442
 443         /* aid in PS-Poll has its two MSBs each set to 1 */
 444         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 445
 446         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
 447         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
 448
 449         ieee80211_tx_skb(sdata, skb, 0);
 450 }
 451
 452 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 453                              struct ieee80211_sub_if_data *sdata,
 454                              int powersave)
 455 {
 456         struct sk_buff *skb;
 457         struct ieee80211_hdr *nullfunc;
 458         __le16 fc;
 459
 460         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 461                 return;
 462
 463         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
 464         if (!skb) {
 465                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
 466                        "frame\n", sdata->dev->name);
 467                 return;
 468         }
 469         skb_reserve(skb, local->hw.extra_tx_headroom);
 470
 471         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
 472         memset(nullfunc, 0, 24);
 473         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 474                          IEEE80211_FCTL_TODS);
 475         if (powersave)
 476                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
 477         nullfunc->frame_control = fc;
 478         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 479         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
 480         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 481
 482         ieee80211_tx_skb(sdata, skb, 0);
 483 }
 484
 485 /* powersave */
 486 static void ieee80211_enable_ps(struct ieee80211_local *local,
 487                                 struct ieee80211_sub_if_data *sdata)
 488 {
 489         struct ieee80211_conf *conf = &local->hw.conf;
 490
 491         /*
 492          * If we are scanning right now then the parameters will
 493          * take effect when scan finishes.
 494          */
 495         if (local->hw_scanning || local->sw_scanning)
 496                 return;
 497
 498         if (conf->dynamic_ps_timeout > 0 &&
 499             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 500                 mod_timer(&local->dynamic_ps_timer, jiffies +
 501                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 502         } else {
 503                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 504                         ieee80211_send_nullfunc(local, sdata, 1);
 505                 conf->flags |= IEEE80211_CONF_PS;
 506                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 507         }
 508 }
 509
 510 static void ieee80211_change_ps(struct ieee80211_local *local)
 511 {
 512         struct ieee80211_conf *conf = &local->hw.conf;
 513
 514         if (local->ps_sdata) {
 515                 if (!(local->ps_sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED))
 516                         return;
 517
 518                 ieee80211_enable_ps(local, local->ps_sdata);
 519         } else if (conf->flags & IEEE80211_CONF_PS) {
 520                 conf->flags &= ~IEEE80211_CONF_PS;
 521                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 522                 del_timer_sync(&local->dynamic_ps_timer);
 523                 cancel_work_sync(&local->dynamic_ps_enable_work);
 524         }
 525 }
 526
 527 /* need to hold RTNL or interface lock */
 528 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 529 {
 530         struct ieee80211_sub_if_data *sdata, *found = NULL;
 531         int count = 0;
 532
 533         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 534                 local->ps_sdata = NULL;
 535                 return;
 536         }
 537
 538         list_for_each_entry(sdata, &local->interfaces, list) {
 539                 if (!netif_running(sdata->dev))
 540                         continue;
 541                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 542                         continue;
 543                 found = sdata;
 544                 count++;
 545         }
 546
 547         if (count == 1 && found->u.mgd.powersave) {
 548                 s32 beaconint_us;
 549
 550                 if (latency < 0)
 551                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 552
 553                 beaconint_us = ieee80211_tu_to_usec(
 554                                         found->vif.bss_conf.beacon_int);
 555
 556                 if (beaconint_us > latency) {
 557                         local->ps_sdata = NULL;
 558                 } else {
 559                         u8 dtimper = found->vif.bss_conf.dtim_period;
 560                         int maxslp = 1;
 561
 562                         if (dtimper > 1)
 563                                 maxslp = min_t(int, dtimper,
 564                                                     latency / beaconint_us);
 565
 566                         local->hw.conf.max_sleep_period = maxslp;
 567                         local->ps_sdata = found;
 568                 }
 569         } else {
 570                 local->ps_sdata = NULL;
 571         }
 572
 573         ieee80211_change_ps(local);
 574 }
 575
 576 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 577 {
 578         struct ieee80211_local *local =
 579                 container_of(work, struct ieee80211_local,
 580                              dynamic_ps_disable_work);
 581
 582         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 583                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 584                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 585         }
 586
 587         ieee80211_wake_queues_by_reason(&local->hw,
 588                                         IEEE80211_QUEUE_STOP_REASON_PS);
 589 }
 590
 591 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 592 {
 593         struct ieee80211_local *local =
 594                 container_of(work, struct ieee80211_local,
 595                              dynamic_ps_enable_work);
 596         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 597
 598         /* can only happen when PS was just disabled anyway */
 599         if (!sdata)
 600                 return;
 601
 602         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 603                 return;
 604
 605         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 606                 ieee80211_send_nullfunc(local, sdata, 1);
 607
 608         local->hw.conf.flags |= IEEE80211_CONF_PS;
 609         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 610 }
 611
 612 void ieee80211_dynamic_ps_timer(unsigned long data)
 613 {
 614         struct ieee80211_local *local = (void *) data;
 615
 616         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
 617 }
 618
 619 /* MLME */
 620 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 621                                      struct ieee80211_if_managed *ifmgd,
 622                                      u8 *wmm_param, size_t wmm_param_len)
 623 {
 624         struct ieee80211_tx_queue_params params;
 625         size_t left;
 626         int count;
 627         u8 *pos;
 628
 629         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
 630                 return;
 631
 632         if (!wmm_param)
 633                 return;
 634
 635         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 636                 return;
 637         count = wmm_param[6] & 0x0f;
 638         if (count == ifmgd->wmm_last_param_set)
 639                 return;
 640         ifmgd->wmm_last_param_set = count;
 641
 642         pos = wmm_param + 8;
 643         left = wmm_param_len - 8;
 644
 645         memset(&params, 0, sizeof(params));
 646
 647         local->wmm_acm = 0;
 648         for (; left >= 4; left -= 4, pos += 4) {
 649                 int aci = (pos[0] >> 5) & 0x03;
 650                 int acm = (pos[0] >> 4) & 0x01;
 651                 int queue;
 652
 653                 switch (aci) {
 654                 case 1: /* AC_BK */
 655                         queue = 3;
 656                         if (acm)
 657                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 658                         break;
 659                 case 2: /* AC_VI */
 660                         queue = 1;
 661                         if (acm)
 662                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 663                         break;
 664                 case 3: /* AC_VO */
 665                         queue = 0;
 666                         if (acm)
 667                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 668                         break;
 669                 case 0: /* AC_BE */
 670                 default:
 671                         queue = 2;
 672                         if (acm)
 673                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 674                         break;
 675                 }
 676
 677                 params.aifs = pos[0] & 0x0f;
 678                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 679                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 680                 params.txop = get_unaligned_le16(pos + 2);
 681 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 682                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 683                        "cWmin=%d cWmax=%d txop=%d\n",
 684                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 685                        params.cw_max, params.txop);
 686 #endif
 687                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
 688                         printk(KERN_DEBUG "%s: failed to set TX queue "
 689                                "parameters for queue %d\n", local->mdev->name,
 690                                queue);
 691         }
 692 }
 693
 694 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 695                                            u16 capab, bool erp_valid, u8 erp)
 696 {
 697         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 698 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 699         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 700 #endif
 701         u32 changed = 0;
 702         bool use_protection;
 703         bool use_short_preamble;
 704         bool use_short_slot;
 705
 706         if (erp_valid) {
 707                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 708                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 709         } else {
 710                 use_protection = false;
 711                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 712         }
 713
 714         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 715
 716         if (use_protection != bss_conf->use_cts_prot) {
 717 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 718                 if (net_ratelimit()) {
 719                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 720                                sdata->dev->name,
 721                                use_protection ? "enabled" : "disabled",
 722                                ifmgd->bssid);
 723                 }
 724 #endif
 725                 bss_conf->use_cts_prot = use_protection;
 726                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 727         }
 728
 729         if (use_short_preamble != bss_conf->use_short_preamble) {
 730 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 731                 if (net_ratelimit()) {
 732                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 733                                " (BSSID=%pM)\n",
 734                                sdata->dev->name,
 735                                use_short_preamble ? "short" : "long",
 736                                ifmgd->bssid);
 737                 }
 738 #endif
 739                 bss_conf->use_short_preamble = use_short_preamble;
 740                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 741         }
 742
 743         if (use_short_slot != bss_conf->use_short_slot) {
 744 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 745                 if (net_ratelimit()) {
 746                         printk(KERN_DEBUG "%s: switched to %s slot time"
 747                                " (BSSID=%pM)\n",
 748                                sdata->dev->name,
 749                                use_short_slot ? "short" : "long",
 750                                ifmgd->bssid);
 751                 }
 752 #endif
 753                 bss_conf->use_short_slot = use_short_slot;
 754                 changed |= BSS_CHANGED_ERP_SLOT;
 755         }
 756
 757         return changed;
 758 }
 759
 760 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata)
 761 {
 762         union iwreq_data wrqu;
 763
 764         memset(&wrqu, 0, sizeof(wrqu));
 765         if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED)
 766                 memcpy(wrqu.ap_addr.sa_data, sdata->u.mgd.bssid, ETH_ALEN);
 767         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 768         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 769 }
 770
 771 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata)
 772 {
 773         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 774         char *buf;
 775         size_t len;
 776         int i;
 777         union iwreq_data wrqu;
 778
 779         if (!ifmgd->assocreq_ies && !ifmgd->assocresp_ies)
 780                 return;
 781
 782         buf = kmalloc(50 + 2 * (ifmgd->assocreq_ies_len +
 783                                 ifmgd->assocresp_ies_len), GFP_KERNEL);
 784         if (!buf)
 785                 return;
 786
 787         len = sprintf(buf, "ASSOCINFO(");
 788         if (ifmgd->assocreq_ies) {
 789                 len += sprintf(buf + len, "ReqIEs=");
 790                 for (i = 0; i < ifmgd->assocreq_ies_len; i++) {
 791                         len += sprintf(buf + len, "%02x",
 792                                        ifmgd->assocreq_ies[i]);
 793                 }
 794         }
 795         if (ifmgd->assocresp_ies) {
 796                 if (ifmgd->assocreq_ies)
 797                         len += sprintf(buf + len, " ");
 798                 len += sprintf(buf + len, "RespIEs=");
 799                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 800                         len += sprintf(buf + len, "%02x",
 801                                        ifmgd->assocresp_ies[i]);
 802                 }
 803         }
 804         len += sprintf(buf + len, ")");
 805
 806         if (len > IW_CUSTOM_MAX) {
 807                 len = sprintf(buf, "ASSOCRESPIE=");
 808                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 809                         len += sprintf(buf + len, "%02x",
 810                                        ifmgd->assocresp_ies[i]);
 811                 }
 812         }
 813
 814         if (len <= IW_CUSTOM_MAX) {
 815                 memset(&wrqu, 0, sizeof(wrqu));
 816                 wrqu.data.length = len;
 817                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 818         }
 819
 820         kfree(buf);
 821 }
 822
 823
 824 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 825                                      u32 bss_info_changed)
 826 {
 827         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 828         struct ieee80211_local *local = sdata->local;
 829         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 830
 831         struct ieee80211_bss *bss;
 832
 833         bss_info_changed |= BSS_CHANGED_ASSOC;
 834         ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
 835
 836         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 837                                    conf->channel->center_freq,
 838                                    ifmgd->ssid, ifmgd->ssid_len);
 839         if (bss) {
 840                 /* set timing information */
 841                 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 842                 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 843                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 844
 845                 bss_info_changed |= BSS_CHANGED_BEACON_INT;
 846                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 847                         bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 848
 849                 cfg80211_hold_bss(&bss->cbss);
 850
 851                 ieee80211_rx_bss_put(local, bss);
 852         }
 853
 854         ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
 855         memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
 856         ieee80211_sta_send_associnfo(sdata);
 857
 858         ifmgd->last_probe = jiffies;
 859         ieee80211_led_assoc(local, 1);
 860
 861         sdata->vif.bss_conf.assoc = 1;
 862         /*
 863          * For now just always ask the driver to update the basic rateset
 864          * when we have associated, we aren't checking whether it actually
 865          * changed or not.
 866          */
 867         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 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         ieee80211_sta_send_apinfo(sdata);
 881 }
 882
 883 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
 884 {
 885         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 886         struct ieee80211_local *local = sdata->local;
 887
 888         ifmgd->direct_probe_tries++;
 889         if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 890                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 891                        sdata->dev->name, ifmgd->bssid);
 892                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 893                 ieee80211_recalc_idle(local);
 894                 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid);
 895
 896                 /*
 897                  * Most likely AP is not in the range so remove the
 898                  * bss information associated to the AP
 899                  */
 900                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 901                                 sdata->local->hw.conf.channel->center_freq,
 902                                 ifmgd->ssid, ifmgd->ssid_len);
 903
 904                 /*
 905                  * We might have a pending scan which had no chance to run yet
 906                  * due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
 907                  * Hence, queue the STAs work again
 908                  */
 909                 queue_work(local->hw.workqueue, &ifmgd->work);
 910                 return;
 911         }
 912
 913         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 914                         sdata->dev->name, ifmgd->bssid,
 915                         ifmgd->direct_probe_tries);
 916
 917         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 918
 919         /* Direct probe is sent to broadcast address as some APs
 920          * will not answer to direct packet in unassociated state.
 921          */
 922         ieee80211_send_probe_req(sdata, NULL,
 923                                  ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
 924
 925         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 926 }
 927
 928
 929 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
 930 {
 931         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 932         struct ieee80211_local *local = sdata->local;
 933         u8 *ies;
 934         size_t ies_len;
 935
 936         ifmgd->auth_tries++;
 937         if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 938                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 939                        " timed out\n",
 940                        sdata->dev->name, ifmgd->bssid);
 941                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 942                 ieee80211_recalc_idle(local);
 943                 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid);
 944                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 945                                 sdata->local->hw.conf.channel->center_freq,
 946                                 ifmgd->ssid, ifmgd->ssid_len);
 947
 948                 /*
 949                  * We might have a pending scan which had no chance to run yet
 950                  * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
 951                  * Hence, queue the STAs work again
 952                  */
 953                 queue_work(local->hw.workqueue, &ifmgd->work);
 954                 return;
 955         }
 956
 957         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
 958         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 959                sdata->dev->name, ifmgd->bssid);
 960
 961         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
 962                 ies = ifmgd->sme_auth_ie;
 963                 ies_len = ifmgd->sme_auth_ie_len;
 964         } else {
 965                 ies = NULL;
 966                 ies_len = 0;
 967         }
 968         ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len,
 969                             ifmgd->bssid, 0);
 970         ifmgd->auth_transaction = 2;
 971
 972         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 973 }
 974
 975 /*
 976  * The disassoc 'reason' argument can be either our own reason
 977  * if self disconnected or a reason code from the AP.
 978  */
 979 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 980                                    bool deauth, bool self_disconnected,
 981                                    u16 reason)
 982 {
 983         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 984         struct ieee80211_local *local = sdata->local;
 985         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 986         struct ieee80211_bss *bss;
 987         struct sta_info *sta;
 988         u32 changed = 0, config_changed = 0;
 989
 990         rcu_read_lock();
 991
 992         sta = sta_info_get(local, ifmgd->bssid);
 993         if (!sta) {
 994                 rcu_read_unlock();
 995                 return;
 996         }
 997
 998         if (deauth) {
 999                 ifmgd->direct_probe_tries = 0;
1000                 ifmgd->auth_tries = 0;
1001         }
1002         ifmgd->assoc_scan_tries = 0;
1003         ifmgd->assoc_tries = 0;
1004
1005         netif_tx_stop_all_queues(sdata->dev);
1006         netif_carrier_off(sdata->dev);
1007
1008         ieee80211_sta_tear_down_BA_sessions(sta);
1009
1010         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1011                                    conf->channel->center_freq,
1012                                    ifmgd->ssid, ifmgd->ssid_len);
1013
1014         if (bss) {
1015                 cfg80211_unhold_bss(&bss->cbss);
1016                 ieee80211_rx_bss_put(local, bss);
1017         }
1018
1019         if (self_disconnected) {
1020                 if (deauth)
1021                         ieee80211_send_deauth_disassoc(sdata,
1022                                 IEEE80211_STYPE_DEAUTH, reason);
1023                 else
1024                         ieee80211_send_deauth_disassoc(sdata,
1025                                 IEEE80211_STYPE_DISASSOC, reason);
1026         }
1027
1028         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1029         changed |= ieee80211_reset_erp_info(sdata);
1030
1031         ieee80211_led_assoc(local, 0);
1032         changed |= BSS_CHANGED_ASSOC;
1033         sdata->vif.bss_conf.assoc = false;
1034
1035         ieee80211_sta_send_apinfo(sdata);
1036
1037         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
1038                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1039                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1040                                 sdata->local->hw.conf.channel->center_freq,
1041                                 ifmgd->ssid, ifmgd->ssid_len);
1042         }
1043
1044         rcu_read_unlock();
1045
1046         ieee80211_set_wmm_default(sdata);
1047
1048         ieee80211_recalc_idle(local);
1049
1050         /* channel(_type) changes are handled by ieee80211_hw_config */
1051         local->oper_channel_type = NL80211_CHAN_NO_HT;
1052
1053         local->power_constr_level = 0;
1054
1055         del_timer_sync(&local->dynamic_ps_timer);
1056         cancel_work_sync(&local->dynamic_ps_enable_work);
1057
1058         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1059                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1060                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1061         }
1062
1063         ieee80211_hw_config(local, config_changed);
1064         ieee80211_bss_info_change_notify(sdata, changed);
1065
1066         rcu_read_lock();
1067
1068         sta = sta_info_get(local, ifmgd->bssid);
1069         if (!sta) {
1070                 rcu_read_unlock();
1071                 return;
1072         }
1073
1074         sta_info_unlink(&sta);
1075
1076         rcu_read_unlock();
1077
1078         sta_info_destroy(sta);
1079 }
1080
1081 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1082 {
1083         if (!sdata || !sdata->default_key ||
1084             sdata->default_key->conf.alg != ALG_WEP)
1085                 return 0;
1086         return 1;
1087 }
1088
1089 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
1090 {
1091         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1092         struct ieee80211_local *local = sdata->local;
1093         struct ieee80211_bss *bss;
1094         int bss_privacy;
1095         int wep_privacy;
1096         int privacy_invoked;
1097
1098         if (!ifmgd || (ifmgd->flags & IEEE80211_STA_EXT_SME))
1099                 return 0;
1100
1101         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1102                                    local->hw.conf.channel->center_freq,
1103                                    ifmgd->ssid, ifmgd->ssid_len);
1104         if (!bss)
1105                 return 0;
1106
1107         bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
1108         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1109         privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
1110
1111         ieee80211_rx_bss_put(local, bss);
1112
1113         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1114                 return 0;
1115
1116         return 1;
1117 }
1118
1119 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
1120 {
1121         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1122         struct ieee80211_local *local = sdata->local;
1123
1124         ifmgd->assoc_tries++;
1125         if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1126                 printk(KERN_DEBUG "%s: association with AP %pM"
1127                        " timed out\n",
1128                        sdata->dev->name, ifmgd->bssid);
1129                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1130                 ieee80211_recalc_idle(local);
1131                 cfg80211_send_assoc_timeout(sdata->dev, ifmgd->bssid);
1132                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1133                                 sdata->local->hw.conf.channel->center_freq,
1134                                 ifmgd->ssid, ifmgd->ssid_len);
1135                 /*
1136                  * We might have a pending scan which had no chance to run yet
1137                  * due to state == IEEE80211_STA_MLME_ASSOCIATE.
1138                  * Hence, queue the STAs work again
1139                  */
1140                 queue_work(local->hw.workqueue, &ifmgd->work);
1141                 return;
1142         }
1143
1144         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1145         printk(KERN_DEBUG "%s: associate with AP %pM\n",
1146                sdata->dev->name, ifmgd->bssid);
1147         if (ieee80211_privacy_mismatch(sdata)) {
1148                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1149                        "mixed-cell disabled - abort association\n", sdata->dev->name);
1150                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1151                 ieee80211_recalc_idle(local);
1152                 return;
1153         }
1154
1155         ieee80211_send_assoc(sdata);
1156
1157         mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1158 }
1159
1160 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1161                              struct ieee80211_hdr *hdr)
1162 {
1163         /*
1164          * We can postpone the mgd.timer whenever receiving unicast frames
1165          * from AP because we know that the connection is working both ways
1166          * at that time. But multicast frames (and hence also beacons) must
1167          * be ignored here, because we need to trigger the timer during
1168          * data idle periods for sending the periodical probe request to
1169          * the AP.
1170          */
1171         if (!is_multicast_ether_addr(hdr->addr1))
1172                 mod_timer(&sdata->u.mgd.timer,
1173                           jiffies + IEEE80211_MONITORING_INTERVAL);
1174 }
1175
1176 void ieee80211_beacon_loss_work(struct work_struct *work)
1177 {
1178         struct ieee80211_sub_if_data *sdata =
1179                 container_of(work, struct ieee80211_sub_if_data,
1180                              u.mgd.beacon_loss_work);
1181         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1182
1183 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1184         if (net_ratelimit()) {
1185                 printk(KERN_DEBUG "%s: driver reports beacon loss from AP %pM "
1186                        "- sending probe request\n", sdata->dev->name,
1187                        sdata->u.mgd.bssid);
1188         }
1189 #endif
1190
1191         ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1192         ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1193                                  ifmgd->ssid_len, NULL, 0);
1194
1195         mod_timer(&ifmgd->timer, jiffies + IEEE80211_MONITORING_INTERVAL);
1196 }
1197
1198 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1199 {
1200         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1201
1202         queue_work(sdata->local->hw.workqueue,
1203                    &sdata->u.mgd.beacon_loss_work);
1204 }
1205 EXPORT_SYMBOL(ieee80211_beacon_loss);
1206
1207 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
1208 {
1209         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1210         struct ieee80211_local *local = sdata->local;
1211         struct sta_info *sta;
1212         bool disassoc = false;
1213
1214         /* TODO: start monitoring current AP signal quality and number of
1215          * missed beacons. Scan other channels every now and then and search
1216          * for better APs. */
1217         /* TODO: remove expired BSSes */
1218
1219         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
1220
1221         rcu_read_lock();
1222
1223         sta = sta_info_get(local, ifmgd->bssid);
1224         if (!sta) {
1225                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1226                        sdata->dev->name, ifmgd->bssid);
1227                 disassoc = true;
1228                 goto unlock;
1229         }
1230
1231         if ((ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) &&
1232             time_after(jiffies, sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1233                 printk(KERN_DEBUG "%s: no probe response from AP %pM "
1234                        "- disassociating\n",
1235                        sdata->dev->name, ifmgd->bssid);
1236                 disassoc = true;
1237                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1238                 goto unlock;
1239         }
1240
1241         /*
1242          * Beacon filtering is only enabled with power save and then the
1243          * stack should not check for beacon loss.
1244          */
1245         if (!((local->hw.flags & IEEE80211_HW_BEACON_FILTER) &&
1246               (local->hw.conf.flags & IEEE80211_CONF_PS)) &&
1247             time_after(jiffies,
1248                        ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) {
1249 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1250                 if (net_ratelimit()) {
1251                         printk(KERN_DEBUG "%s: beacon loss from AP %pM "
1252                                "- sending probe request\n",
1253                                sdata->dev->name, ifmgd->bssid);
1254                 }
1255 #endif
1256                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1257                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1258                                          ifmgd->ssid_len, NULL, 0);
1259                 goto unlock;
1260
1261         }
1262
1263         if (time_after(jiffies, sta->last_rx + IEEE80211_PROBE_IDLE_TIME)) {
1264                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1265                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1266                                          ifmgd->ssid_len, NULL, 0);
1267         }
1268
1269  unlock:
1270         rcu_read_unlock();
1271
1272         if (disassoc)
1273                 ieee80211_set_disassoc(sdata, true, true,
1274                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1275         else
1276                 mod_timer(&ifmgd->timer, jiffies +
1277                                       IEEE80211_MONITORING_INTERVAL);
1278 }
1279
1280
1281 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
1282 {
1283         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1284
1285         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1286         ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
1287         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1288                 /* Wait for SME to request association */
1289                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1290                 ieee80211_recalc_idle(sdata->local);
1291         } else
1292                 ieee80211_associate(sdata);
1293 }
1294
1295
1296 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1297                                      struct ieee80211_mgmt *mgmt,
1298                                      size_t len)
1299 {
1300         u8 *pos;
1301         struct ieee802_11_elems elems;
1302
1303         pos = mgmt->u.auth.variable;
1304         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1305         if (!elems.challenge)
1306                 return;
1307         ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
1308                             elems.challenge - 2, elems.challenge_len + 2,
1309                             sdata->u.mgd.bssid, 1);
1310         sdata->u.mgd.auth_transaction = 4;
1311 }
1312
1313 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1314                                    struct ieee80211_mgmt *mgmt,
1315                                    size_t len)
1316 {
1317         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1318         u16 auth_alg, auth_transaction, status_code;
1319
1320         if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1321                 return;
1322
1323         if (len < 24 + 6)
1324                 return;
1325
1326         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1327                 return;
1328
1329         if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1330                 return;
1331
1332         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1333         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1334         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1335
1336         if (auth_alg != ifmgd->auth_alg ||
1337             auth_transaction != ifmgd->auth_transaction)
1338                 return;
1339
1340         if (status_code != WLAN_STATUS_SUCCESS) {
1341                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1342                         u8 algs[3];
1343                         const int num_algs = ARRAY_SIZE(algs);
1344                         int i, pos;
1345                         algs[0] = algs[1] = algs[2] = 0xff;
1346                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1347                                 algs[0] = WLAN_AUTH_OPEN;
1348                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1349                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1350                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1351                                 algs[2] = WLAN_AUTH_LEAP;
1352                         if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1353                                 pos = 0;
1354                         else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1355                                 pos = 1;
1356                         else
1357                                 pos = 2;
1358                         for (i = 0; i < num_algs; i++) {
1359                                 pos++;
1360                                 if (pos >= num_algs)
1361                                         pos = 0;
1362                                 if (algs[pos] == ifmgd->auth_alg ||
1363                                     algs[pos] == 0xff)
1364                                         continue;
1365                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1366                                     !ieee80211_sta_wep_configured(sdata))
1367                                         continue;
1368                                 ifmgd->auth_alg = algs[pos];
1369                                 break;
1370                         }
1371                 }
1372                 return;
1373         }
1374
1375         switch (ifmgd->auth_alg) {
1376         case WLAN_AUTH_OPEN:
1377         case WLAN_AUTH_LEAP:
1378         case WLAN_AUTH_FT:
1379                 ieee80211_auth_completed(sdata);
1380                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1381                 break;
1382         case WLAN_AUTH_SHARED_KEY:
1383                 if (ifmgd->auth_transaction == 4) {
1384                         ieee80211_auth_completed(sdata);
1385                         cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1386                 } else
1387                         ieee80211_auth_challenge(sdata, mgmt, len);
1388                 break;
1389         }
1390 }
1391
1392
1393 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1394                                      struct ieee80211_mgmt *mgmt,
1395                                      size_t len)
1396 {
1397         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1398         u16 reason_code;
1399
1400         if (len < 24 + 2)
1401                 return;
1402
1403         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1404                 return;
1405
1406         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1407
1408         if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1409                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1410                                 sdata->dev->name, reason_code);
1411
1412         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1413             (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1414              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1415              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)) {
1416                 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1417                 mod_timer(&ifmgd->timer, jiffies +
1418                                       IEEE80211_RETRY_AUTH_INTERVAL);
1419         }
1420
1421         ieee80211_set_disassoc(sdata, true, false, 0);
1422         ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1423         cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, len);
1424 }
1425
1426
1427 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1428                                        struct ieee80211_mgmt *mgmt,
1429                                        size_t len)
1430 {
1431         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1432         u16 reason_code;
1433
1434         if (len < 24 + 2)
1435                 return;
1436
1437         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1438                 return;
1439
1440         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1441
1442         if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1443                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1444                                 sdata->dev->name, reason_code);
1445
1446         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1447             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1448                 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1449                 mod_timer(&ifmgd->timer, jiffies +
1450                                       IEEE80211_RETRY_AUTH_INTERVAL);
1451         }
1452
1453         ieee80211_set_disassoc(sdata, false, false, reason_code);
1454         cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, len);
1455 }
1456
1457
1458 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1459                                          struct ieee80211_mgmt *mgmt,
1460                                          size_t len,
1461                                          int reassoc)
1462 {
1463         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1464         struct ieee80211_local *local = sdata->local;
1465         struct ieee80211_supported_band *sband;
1466         struct sta_info *sta;
1467         u32 rates, basic_rates;
1468         u16 capab_info, status_code, aid;
1469         struct ieee802_11_elems elems;
1470         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1471         u8 *pos;
1472         u32 changed = 0;
1473         int i, j;
1474         bool have_higher_than_11mbit = false, newsta = false;
1475         u16 ap_ht_cap_flags;
1476
1477         /* AssocResp and ReassocResp have identical structure, so process both
1478          * of them in this function. */
1479
1480         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1481                 return;
1482
1483         if (len < 24 + 6)
1484                 return;
1485
1486         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1487                 return;
1488
1489         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1490         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1491         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1492
1493         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1494                "status=%d aid=%d)\n",
1495                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1496                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1497
1498         pos = mgmt->u.assoc_resp.variable;
1499         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1500
1501         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1502             elems.timeout_int && elems.timeout_int_len == 5 &&
1503             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1504                 u32 tu, ms;
1505                 tu = get_unaligned_le32(elems.timeout_int + 1);
1506                 ms = tu * 1024 / 1000;
1507                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1508                        "comeback duration %u TU (%u ms)\n",
1509                        sdata->dev->name, tu, ms);
1510                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1511                         mod_timer(&ifmgd->timer,
1512                                   jiffies + msecs_to_jiffies(ms));
1513                 return;
1514         }
1515
1516         if (status_code != WLAN_STATUS_SUCCESS) {
1517                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1518                        sdata->dev->name, status_code);
1519                 /* if this was a reassociation, ensure we try a "full"
1520                  * association next time. This works around some broken APs
1521                  * which do not correctly reject reassociation requests. */
1522                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1523                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1524                 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1525                         /* Wait for SME to decide what to do next */
1526                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1527                         ieee80211_recalc_idle(local);
1528                 }
1529                 return;
1530         }
1531
1532         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1533                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1534                        "set\n", sdata->dev->name, aid);
1535         aid &= ~(BIT(15) | BIT(14));
1536
1537         if (!elems.supp_rates) {
1538                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1539                        sdata->dev->name);
1540                 return;
1541         }
1542
1543         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1544         ifmgd->aid = aid;
1545         ifmgd->ap_capab = capab_info;
1546
1547         kfree(ifmgd->assocresp_ies);
1548         ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1549         ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1550         if (ifmgd->assocresp_ies)
1551                 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1552
1553         rcu_read_lock();
1554
1555         /* Add STA entry for the AP */
1556         sta = sta_info_get(local, ifmgd->bssid);
1557         if (!sta) {
1558                 newsta = true;
1559
1560                 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1561                 if (!sta) {
1562                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1563                                " the AP\n", sdata->dev->name);
1564                         rcu_read_unlock();
1565                         return;
1566                 }
1567
1568                 /* update new sta with its last rx activity */
1569                 sta->last_rx = jiffies;
1570         }
1571
1572         /*
1573          * FIXME: Do we really need to update the sta_info's information here?
1574          *        We already know about the AP (we found it in our list) so it
1575          *        should already be filled with the right info, no?
1576          *        As is stands, all this is racy because typically we assume
1577          *        the information that is filled in here (except flags) doesn't
1578          *        change while a STA structure is alive. As such, it should move
1579          *        to between the sta_info_alloc() and sta_info_insert() above.
1580          */
1581
1582         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1583                            WLAN_STA_AUTHORIZED);
1584
1585         rates = 0;
1586         basic_rates = 0;
1587         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1588
1589         for (i = 0; i < elems.supp_rates_len; i++) {
1590                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1591                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1592
1593                 if (rate > 110)
1594                         have_higher_than_11mbit = true;
1595
1596                 for (j = 0; j < sband->n_bitrates; j++) {
1597                         if (sband->bitrates[j].bitrate == rate) {
1598                                 rates |= BIT(j);
1599                                 if (is_basic)
1600                                         basic_rates |= BIT(j);
1601                                 break;
1602                         }
1603                 }
1604         }
1605
1606         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1607                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1608                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1609
1610                 if (rate > 110)
1611                         have_higher_than_11mbit = true;
1612
1613                 for (j = 0; j < sband->n_bitrates; j++) {
1614                         if (sband->bitrates[j].bitrate == rate) {
1615                                 rates |= BIT(j);
1616                                 if (is_basic)
1617                                         basic_rates |= BIT(j);
1618                                 break;
1619                         }
1620                 }
1621         }
1622
1623         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1624         sdata->vif.bss_conf.basic_rates = basic_rates;
1625
1626         /* cf. IEEE 802.11 9.2.12 */
1627         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1628             have_higher_than_11mbit)
1629                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1630         else
1631                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1632
1633         /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1634         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1635                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1636                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1637
1638         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1639
1640         rate_control_rate_init(sta);
1641
1642         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1643                 set_sta_flags(sta, WLAN_STA_MFP);
1644
1645         if (elems.wmm_param)
1646                 set_sta_flags(sta, WLAN_STA_WME);
1647
1648         if (newsta) {
1649                 int err = sta_info_insert(sta);
1650                 if (err) {
1651                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1652                                " the AP (error %d)\n", sdata->dev->name, err);
1653                         rcu_read_unlock();
1654                         return;
1655                 }
1656         }
1657
1658         rcu_read_unlock();
1659
1660         if (elems.wmm_param)
1661                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1662                                          elems.wmm_param_len);
1663         else
1664                 ieee80211_set_wmm_default(sdata);
1665
1666         if (elems.ht_info_elem && elems.wmm_param &&
1667             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1668             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1669                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1670                                                ap_ht_cap_flags);
1671
1672         /* set AID and assoc capability,
1673          * ieee80211_set_associated() will tell the driver */
1674         bss_conf->aid = aid;
1675         bss_conf->assoc_capability = capab_info;
1676         ieee80211_set_associated(sdata, changed);
1677
1678         /*
1679          * initialise the time of last beacon to be the association time,
1680          * otherwise beacon loss check will trigger immediately
1681          */
1682         ifmgd->last_beacon = jiffies;
1683
1684         ieee80211_associated(sdata);
1685         cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1686 }
1687
1688
1689 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1690                                   struct ieee80211_mgmt *mgmt,
1691                                   size_t len,
1692                                   struct ieee80211_rx_status *rx_status,
1693                                   struct ieee802_11_elems *elems,
1694                                   bool beacon)
1695 {
1696         struct ieee80211_local *local = sdata->local;
1697         int freq;
1698         struct ieee80211_bss *bss;
1699         struct ieee80211_channel *channel;
1700
1701         if (elems->ds_params && elems->ds_params_len == 1)
1702                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1703         else
1704                 freq = rx_status->freq;
1705
1706         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1707
1708         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1709                 return;
1710
1711         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1712                                         channel, beacon);
1713         if (!bss)
1714                 return;
1715
1716         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1717             (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1718                 struct ieee80211_channel_sw_ie *sw_elem =
1719                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1720                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1721         }
1722
1723         ieee80211_rx_bss_put(local, bss);
1724 }
1725
1726
1727 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1728                                          struct ieee80211_mgmt *mgmt,
1729                                          size_t len,
1730                                          struct ieee80211_rx_status *rx_status)
1731 {
1732         struct ieee80211_if_managed *ifmgd;
1733         size_t baselen;
1734         struct ieee802_11_elems elems;
1735
1736         ifmgd = &sdata->u.mgd;
1737
1738         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1739                 return; /* ignore ProbeResp to foreign address */
1740
1741         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1742         if (baselen > len)
1743                 return;
1744
1745         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1746                                 &elems);
1747
1748         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1749
1750         /* direct probe may be part of the association flow */
1751         if (ifmgd->state == IEEE80211_STA_MLME_DIRECT_PROBE) {
1752                 printk(KERN_DEBUG "%s direct probe responded\n",
1753                        sdata->dev->name);
1754                 ieee80211_authenticate(sdata);
1755         }
1756
1757         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1758                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1759 }
1760
1761 /*
1762  * This is the canonical list of information elements we care about,
1763  * the filter code also gives us all changes to the Microsoft OUI
1764  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1765  *
1766  * We implement beacon filtering in software since that means we can
1767  * avoid processing the frame here and in cfg80211, and userspace
1768  * will not be able to tell whether the hardware supports it or not.
1769  *
1770  * XXX: This list needs to be dynamic -- userspace needs to be able to
1771  *      add items it requires. It also needs to be able to tell us to
1772  *      look out for other vendor IEs.
1773  */
1774 static const u64 care_about_ies =
1775         (1ULL << WLAN_EID_COUNTRY) |
1776         (1ULL << WLAN_EID_ERP_INFO) |
1777         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1778         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1779         (1ULL << WLAN_EID_HT_CAPABILITY) |
1780         (1ULL << WLAN_EID_HT_INFORMATION);
1781
1782 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1783                                      struct ieee80211_mgmt *mgmt,
1784                                      size_t len,
1785                                      struct ieee80211_rx_status *rx_status)
1786 {
1787         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1788         size_t baselen;
1789         struct ieee802_11_elems elems;
1790         struct ieee80211_local *local = sdata->local;
1791         u32 changed = 0;
1792         bool erp_valid, directed_tim = false;
1793         u8 erp_value = 0;
1794         u32 ncrc;
1795
1796         /* Process beacon from the current BSS */
1797         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1798         if (baselen > len)
1799                 return;
1800
1801         if (rx_status->freq != local->hw.conf.channel->center_freq)
1802                 return;
1803
1804         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1805             memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1806                 return;
1807
1808         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1809         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1810                                           len - baselen, &elems,
1811                                           care_about_ies, ncrc);
1812
1813         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1814                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1815                                                    ifmgd->aid);
1816
1817         ncrc = crc32_be(ncrc, (void *)&directed_tim, sizeof(directed_tim));
1818
1819         if (ncrc == ifmgd->beacon_crc)
1820                 return;
1821         ifmgd->beacon_crc = ncrc;
1822
1823         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1824
1825         ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1826                                  elems.wmm_param_len);
1827
1828         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1829                 if (directed_tim) {
1830                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1831                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1832                                 ieee80211_hw_config(local,
1833                                                     IEEE80211_CONF_CHANGE_PS);
1834                                 ieee80211_send_nullfunc(local, sdata, 0);
1835                         } else {
1836                                 local->pspolling = true;
1837
1838                                 /*
1839                                  * Here is assumed that the driver will be
1840                                  * able to send ps-poll frame and receive a
1841                                  * response even though power save mode is
1842                                  * enabled, but some drivers might require
1843                                  * to disable power save here. This needs
1844                                  * to be investigated.
1845                                  */
1846                                 ieee80211_send_pspoll(local, sdata);
1847                         }
1848                 }
1849         }
1850
1851         if (elems.erp_info && elems.erp_info_len >= 1) {
1852                 erp_valid = true;
1853                 erp_value = elems.erp_info[0];
1854         } else {
1855                 erp_valid = false;
1856         }
1857         changed |= ieee80211_handle_bss_capability(sdata,
1858                         le16_to_cpu(mgmt->u.beacon.capab_info),
1859                         erp_valid, erp_value);
1860
1861
1862         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1863             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
1864                 struct sta_info *sta;
1865                 struct ieee80211_supported_band *sband;
1866                 u16 ap_ht_cap_flags;
1867
1868                 rcu_read_lock();
1869
1870                 sta = sta_info_get(local, ifmgd->bssid);
1871                 if (!sta) {
1872                         rcu_read_unlock();
1873                         return;
1874                 }
1875
1876                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1877
1878                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1879                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1880
1881                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1882
1883                 rcu_read_unlock();
1884
1885                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1886                                                ap_ht_cap_flags);
1887         }
1888
1889         if (elems.country_elem) {
1890                 /* Note we are only reviewing this on beacons
1891                  * for the BSSID we are associated to */
1892                 regulatory_hint_11d(local->hw.wiphy,
1893                         elems.country_elem, elems.country_elem_len);
1894
1895                 /* TODO: IBSS also needs this */
1896                 if (elems.pwr_constr_elem)
1897                         ieee80211_handle_pwr_constr(sdata,
1898                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1899                                 elems.pwr_constr_elem,
1900                                 elems.pwr_constr_elem_len);
1901         }
1902
1903         ieee80211_bss_info_change_notify(sdata, changed);
1904 }
1905
1906 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1907                                           struct sk_buff *skb,
1908                                           struct ieee80211_rx_status *rx_status)
1909 {
1910         struct ieee80211_local *local = sdata->local;
1911         struct ieee80211_mgmt *mgmt;
1912         u16 fc;
1913
1914         if (skb->len < 24)
1915                 return RX_DROP_MONITOR;
1916
1917         mgmt = (struct ieee80211_mgmt *) skb->data;
1918         fc = le16_to_cpu(mgmt->frame_control);
1919
1920         switch (fc & IEEE80211_FCTL_STYPE) {
1921         case IEEE80211_STYPE_PROBE_REQ:
1922         case IEEE80211_STYPE_PROBE_RESP:
1923         case IEEE80211_STYPE_BEACON:
1924                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1925         case IEEE80211_STYPE_AUTH:
1926         case IEEE80211_STYPE_ASSOC_RESP:
1927         case IEEE80211_STYPE_REASSOC_RESP:
1928         case IEEE80211_STYPE_DEAUTH:
1929         case IEEE80211_STYPE_DISASSOC:
1930                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1931                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1932                 return RX_QUEUED;
1933         }
1934
1935         return RX_DROP_MONITOR;
1936 }
1937
1938 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1939                                          struct sk_buff *skb)
1940 {
1941         struct ieee80211_rx_status *rx_status;
1942         struct ieee80211_mgmt *mgmt;
1943         u16 fc;
1944
1945         rx_status = (struct ieee80211_rx_status *) skb->cb;
1946         mgmt = (struct ieee80211_mgmt *) skb->data;
1947         fc = le16_to_cpu(mgmt->frame_control);
1948
1949         switch (fc & IEEE80211_FCTL_STYPE) {
1950         case IEEE80211_STYPE_PROBE_RESP:
1951                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
1952                                              rx_status);
1953                 break;
1954         case IEEE80211_STYPE_BEACON:
1955                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1956                                          rx_status);
1957                 break;
1958         case IEEE80211_STYPE_AUTH:
1959                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
1960                 break;
1961         case IEEE80211_STYPE_ASSOC_RESP:
1962                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
1963                 break;
1964         case IEEE80211_STYPE_REASSOC_RESP:
1965                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
1966                 break;
1967         case IEEE80211_STYPE_DEAUTH:
1968                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1969                 break;
1970         case IEEE80211_STYPE_DISASSOC:
1971                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1972                 break;
1973         }
1974
1975         kfree_skb(skb);
1976 }
1977
1978 static void ieee80211_sta_timer(unsigned long data)
1979 {
1980         struct ieee80211_sub_if_data *sdata =
1981                 (struct ieee80211_sub_if_data *) data;
1982         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1983         struct ieee80211_local *local = sdata->local;
1984
1985         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1986         queue_work(local->hw.workqueue, &ifmgd->work);
1987 }
1988
1989 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
1990 {
1991         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1992         struct ieee80211_local *local = sdata->local;
1993
1994         /* Reset own TSF to allow time synchronization work. */
1995         drv_reset_tsf(local);
1996
1997         ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
1998
1999
2000         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2001                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
2002         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2003                 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
2004         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2005                 ifmgd->auth_alg = WLAN_AUTH_LEAP;
2006         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT)
2007                 ifmgd->auth_alg = WLAN_AUTH_FT;
2008         else
2009                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
2010         ifmgd->auth_transaction = -1;
2011         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
2012         ifmgd->assoc_scan_tries = 0;
2013         ifmgd->direct_probe_tries = 0;
2014         ifmgd->auth_tries = 0;
2015         ifmgd->assoc_tries = 0;
2016         netif_tx_stop_all_queues(sdata->dev);
2017         netif_carrier_off(sdata->dev);
2018 }
2019
2020 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
2021 {
2022         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2023         struct ieee80211_local *local = sdata->local;
2024         struct ieee80211_bss *bss;
2025         u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
2026         u8 ssid_len = ifmgd->ssid_len;
2027         u16 capa_mask = WLAN_CAPABILITY_ESS;
2028         u16 capa_val = WLAN_CAPABILITY_ESS;
2029         struct ieee80211_channel *chan = local->oper_channel;
2030
2031         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
2032             ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2033                             IEEE80211_STA_AUTO_BSSID_SEL |
2034                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
2035                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
2036                 if (sdata->default_key)
2037                         capa_val |= WLAN_CAPABILITY_PRIVACY;
2038         }
2039
2040         if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2041                 chan = NULL;
2042
2043         if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2044                 bssid = NULL;
2045
2046         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
2047                 ssid = NULL;
2048                 ssid_len = 0;
2049         }
2050
2051         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
2052                                        bssid, ssid, ssid_len,
2053                                        capa_mask, capa_val);
2054
2055         if (bss) {
2056                 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
2057                 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
2058                         ieee80211_sta_set_ssid(sdata, bss->ssid,
2059                                                bss->ssid_len);
2060                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
2061                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
2062                                                     bss->supp_rates);
2063                 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
2064                         sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
2065                 else
2066                         sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
2067
2068                 /* Send out direct probe if no probe resp was received or
2069                  * the one we have is outdated
2070                  */
2071                 if (!bss->last_probe_resp ||
2072                     time_after(jiffies, bss->last_probe_resp
2073                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2074                         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2075                 else
2076                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2077
2078                 ieee80211_rx_bss_put(local, bss);
2079                 ieee80211_sta_reset_auth(sdata);
2080                 return 0;
2081         } else {
2082                 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2083
2084                         ifmgd->assoc_scan_tries++;
2085
2086                         ieee80211_request_internal_scan(sdata, ifmgd->ssid,
2087                                                         ssid_len);
2088
2089                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2090                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2091                 } else {
2092                         ifmgd->assoc_scan_tries = 0;
2093                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
2094                         ieee80211_recalc_idle(local);
2095                 }
2096         }
2097         return -1;
2098 }
2099
2100
2101 static void ieee80211_sta_work(struct work_struct *work)
2102 {
2103         struct ieee80211_sub_if_data *sdata =
2104                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2105         struct ieee80211_local *local = sdata->local;
2106         struct ieee80211_if_managed *ifmgd;
2107         struct sk_buff *skb;
2108
2109         if (!netif_running(sdata->dev))
2110                 return;
2111
2112         if (local->sw_scanning || local->hw_scanning)
2113                 return;
2114
2115         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2116                 return;
2117         ifmgd = &sdata->u.mgd;
2118
2119         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2120                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2121
2122         if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2123             ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2124             ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
2125             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
2126                 queue_delayed_work(local->hw.workqueue, &local->scan_work,
2127                                    round_jiffies_relative(0));
2128                 return;
2129         }
2130
2131         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
2132                 if (ieee80211_sta_config_auth(sdata))
2133                         return;
2134                 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2135         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
2136                 return;
2137
2138         ieee80211_recalc_idle(local);
2139
2140         switch (ifmgd->state) {
2141         case IEEE80211_STA_MLME_DISABLED:
2142                 break;
2143         case IEEE80211_STA_MLME_DIRECT_PROBE:
2144                 ieee80211_direct_probe(sdata);
2145                 break;
2146         case IEEE80211_STA_MLME_AUTHENTICATE:
2147                 ieee80211_authenticate(sdata);
2148                 break;
2149         case IEEE80211_STA_MLME_ASSOCIATE:
2150                 ieee80211_associate(sdata);
2151                 break;
2152         case IEEE80211_STA_MLME_ASSOCIATED:
2153                 ieee80211_associated(sdata);
2154                 break;
2155         default:
2156                 WARN_ON(1);
2157                 break;
2158         }
2159
2160         if (ieee80211_privacy_mismatch(sdata)) {
2161                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2162                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2163
2164                 ieee80211_set_disassoc(sdata, false, true,
2165                                         WLAN_REASON_UNSPECIFIED);
2166         }
2167 }
2168
2169 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2170 {
2171         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2172                 /*
2173                  * Need to update last_beacon to avoid beacon loss
2174                  * test to trigger.
2175                  */
2176                 sdata->u.mgd.last_beacon = jiffies;
2177
2178
2179                 queue_work(sdata->local->hw.workqueue,
2180                            &sdata->u.mgd.work);
2181         }
2182 }
2183
2184 /* interface setup */
2185 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2186 {
2187         struct ieee80211_if_managed *ifmgd;
2188         u32 hw_flags;
2189
2190         ifmgd = &sdata->u.mgd;
2191         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2192         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2193         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2194         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2195                     (unsigned long) sdata);
2196         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2197                     (unsigned long) sdata);
2198         skb_queue_head_init(&ifmgd->skb_queue);
2199
2200         ifmgd->capab = WLAN_CAPABILITY_ESS;
2201         ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2202                 IEEE80211_AUTH_ALG_SHARED_KEY;
2203         ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
2204                 IEEE80211_STA_AUTO_BSSID_SEL |
2205                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2206         if (sdata->local->hw.queues >= 4)
2207                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2208
2209         hw_flags = sdata->local->hw.flags;
2210
2211         if (hw_flags & IEEE80211_HW_SUPPORTS_PS) {
2212                 ifmgd->powersave = CONFIG_MAC80211_DEFAULT_PS_VALUE;
2213                 sdata->local->hw.conf.dynamic_ps_timeout = 500;
2214         }
2215 }
2216
2217 /* configuration hooks */
2218 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
2219 {
2220         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2221         struct ieee80211_local *local = sdata->local;
2222
2223         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2224                 return;
2225
2226         if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
2227                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2228             (ifmgd->flags & (IEEE80211_STA_SSID_SET |
2229                              IEEE80211_STA_AUTO_SSID_SEL))) {
2230
2231                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2232                         ieee80211_set_disassoc(sdata, true, true,
2233                                                WLAN_REASON_DEAUTH_LEAVING);
2234
2235                 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) ||
2236                     ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
2237                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2238                 else if (ifmgd->flags & IEEE80211_STA_EXT_SME)
2239                         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2240                 queue_work(local->hw.workqueue, &ifmgd->work);
2241         }
2242 }
2243
2244 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
2245 {
2246         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2247
2248         if (ifmgd->ssid_len)
2249                 ifmgd->flags |= IEEE80211_STA_SSID_SET;
2250         else
2251                 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
2252
2253         return 0;
2254 }
2255
2256 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2257 {
2258         struct ieee80211_if_managed *ifmgd;
2259
2260         if (len > IEEE80211_MAX_SSID_LEN)
2261                 return -EINVAL;
2262
2263         ifmgd = &sdata->u.mgd;
2264
2265         if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
2266                 /*
2267                  * Do not use reassociation if SSID is changed (different ESS).
2268                  */
2269                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2270                 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
2271                 memcpy(ifmgd->ssid, ssid, len);
2272                 ifmgd->ssid_len = len;
2273         }
2274
2275         return ieee80211_sta_commit(sdata);
2276 }
2277
2278 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2279 {
2280         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2281         memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
2282         *len = ifmgd->ssid_len;
2283         return 0;
2284 }
2285
2286 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2287 {
2288         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2289
2290         if (is_valid_ether_addr(bssid)) {
2291                 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
2292                 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
2293         } else {
2294                 memset(ifmgd->bssid, 0, ETH_ALEN);
2295                 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
2296         }
2297
2298         if (netif_running(sdata->dev))
2299                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2300
2301         return ieee80211_sta_commit(sdata);
2302 }
2303
2304 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
2305                                const char *ie, size_t len)
2306 {
2307         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2308
2309         kfree(ifmgd->extra_ie);
2310         if (len == 0) {
2311                 ifmgd->extra_ie = NULL;
2312                 ifmgd->extra_ie_len = 0;
2313                 return 0;
2314         }
2315         ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
2316         if (!ifmgd->extra_ie) {
2317                 ifmgd->extra_ie_len = 0;
2318                 return -ENOMEM;
2319         }
2320         memcpy(ifmgd->extra_ie, ie, len);
2321         ifmgd->extra_ie_len = len;
2322         return 0;
2323 }
2324
2325 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2326 {
2327         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2328                sdata->dev->name, reason);
2329
2330         ieee80211_set_disassoc(sdata, true, true, reason);
2331         return 0;
2332 }
2333
2334 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2335 {
2336         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2337
2338         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2339                sdata->dev->name, reason);
2340
2341         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
2342                 return -ENOLINK;
2343
2344         ieee80211_set_disassoc(sdata, false, true, reason);
2345         return 0;
2346 }
2347
2348 /* scan finished notification */
2349 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2350 {
2351         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2352
2353         /* Restart STA timers */
2354         rcu_read_lock();
2355         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2356                 ieee80211_restart_sta_timer(sdata);
2357         rcu_read_unlock();
2358 }
2359
2360 int ieee80211_max_network_latency(struct notifier_block *nb,
2361                                   unsigned long data, void *dummy)
2362 {
2363         s32 latency_usec = (s32) data;
2364         struct ieee80211_local *local =
2365                 container_of(nb, struct ieee80211_local,
2366                              network_latency_notifier);
2367
2368         mutex_lock(&local->iflist_mtx);
2369         ieee80211_recalc_ps(local, latency_usec);
2370         mutex_unlock(&local->iflist_mtx);
2371
2372         return 0;
2373 }