git.oblomov.eu Git - linux-2.6/blob - net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/pm_qos_params.h>
  21 #include <linux/crc32.h>
  22 #include <net/mac80211.h>
  23 #include <asm/unaligned.h>
  24
  25 #include "ieee80211_i.h"
  26 #include "rate.h"
  27 #include "led.h"
  28
  29 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
  30 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  31 #define IEEE80211_AUTH_MAX_TRIES 3
  32 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  33 #define IEEE80211_ASSOC_MAX_TRIES 3
  34 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  35 #define IEEE80211_PROBE_IDLE_TIME (60 * HZ)
  36 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  37
  38 /* utils */
  39 static int ecw2cw(int ecw)
  40 {
  41         return (1 << ecw) - 1;
  42 }
  43
  44 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  45 {
  46         u8 *end, *pos;
  47
  48         pos = bss->cbss.information_elements;
  49         if (pos == NULL)
  50                 return NULL;
  51         end = pos + bss->cbss.len_information_elements;
  52
  53         while (pos + 1 < end) {
  54                 if (pos + 2 + pos[1] > end)
  55                         break;
  56                 if (pos[0] == ie)
  57                         return pos;
  58                 pos += 2 + pos[1];
  59         }
  60
  61         return NULL;
  62 }
  63
  64 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  65                                       struct ieee80211_supported_band *sband,
  66                                       u32 *rates)
  67 {
  68         int i, j, count;
  69         *rates = 0;
  70         count = 0;
  71         for (i = 0; i < bss->supp_rates_len; i++) {
  72                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  73
  74                 for (j = 0; j < sband->n_bitrates; j++)
  75                         if (sband->bitrates[j].bitrate == rate) {
  76                                 *rates |= BIT(j);
  77                                 count++;
  78                                 break;
  79                         }
  80         }
  81
  82         return count;
  83 }
  84
  85 /*
  86  * ieee80211_enable_ht should be called only after the operating band
  87  * has been determined as ht configuration depends on the hw's
  88  * HT abilities for a specific band.
  89  */
  90 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
  91                                struct ieee80211_ht_info *hti,
  92                                u16 ap_ht_cap_flags)
  93 {
  94         struct ieee80211_local *local = sdata->local;
  95         struct ieee80211_supported_band *sband;
  96         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  97         struct ieee80211_bss_ht_conf ht;
  98         struct sta_info *sta;
  99         u32 changed = 0;
 100         bool enable_ht = true, ht_changed;
 101         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 102
 103         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 104
 105         memset(&ht, 0, sizeof(ht));
 106
 107         /* HT is not supported */
 108         if (!sband->ht_cap.ht_supported)
 109                 enable_ht = false;
 110
 111         /* check that channel matches the right operating channel */
 112         if (local->hw.conf.channel->center_freq !=
 113             ieee80211_channel_to_frequency(hti->control_chan))
 114                 enable_ht = false;
 115
 116         if (enable_ht) {
 117                 channel_type = NL80211_CHAN_HT20;
 118
 119                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 120                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 121                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 122                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 123                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 124                                 channel_type = NL80211_CHAN_HT40PLUS;
 125                                 break;
 126                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 127                                 channel_type = NL80211_CHAN_HT40MINUS;
 128                                 break;
 129                         }
 130                 }
 131         }
 132
 133         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 134                      channel_type != local->hw.conf.channel_type;
 135
 136         local->oper_channel_type = channel_type;
 137
 138         if (ht_changed) {
 139                 /* channel_type change automatically detected */
 140                 ieee80211_hw_config(local, 0);
 141
 142                 rcu_read_lock();
 143
 144                 sta = sta_info_get(local, ifmgd->bssid);
 145                 if (sta)
 146                         rate_control_rate_update(local, sband, sta,
 147                                                  IEEE80211_RC_HT_CHANGED);
 148
 149                 rcu_read_unlock();
 150
 151         }
 152
 153         /* disable HT */
 154         if (!enable_ht)
 155                 return 0;
 156
 157         ht.operation_mode = le16_to_cpu(hti->operation_mode);
 158
 159         /* if bss configuration changed store the new one */
 160         if (memcmp(&sdata->vif.bss_conf.ht, &ht, sizeof(ht))) {
 161                 changed |= BSS_CHANGED_HT;
 162                 sdata->vif.bss_conf.ht = ht;
 163         }
 164
 165         return changed;
 166 }
 167
 168 /* frame sending functions */
 169
 170 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 171 {
 172         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 173         struct ieee80211_local *local = sdata->local;
 174         struct sk_buff *skb;
 175         struct ieee80211_mgmt *mgmt;
 176         u8 *pos, *ies, *ht_ie;
 177         int i, len, count, rates_len, supp_rates_len;
 178         u16 capab;
 179         struct ieee80211_bss *bss;
 180         int wmm = 0;
 181         struct ieee80211_supported_band *sband;
 182         u32 rates = 0;
 183
 184         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 185                             sizeof(*mgmt) + 200 + ifmgd->extra_ie_len +
 186                             ifmgd->ssid_len);
 187         if (!skb) {
 188                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 189                        "frame\n", sdata->dev->name);
 190                 return;
 191         }
 192         skb_reserve(skb, local->hw.extra_tx_headroom);
 193
 194         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 195
 196         capab = ifmgd->capab;
 197
 198         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 199                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 200                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 201                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 202                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 203         }
 204
 205         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 206                                    local->hw.conf.channel->center_freq,
 207                                    ifmgd->ssid, ifmgd->ssid_len);
 208         if (bss) {
 209                 if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
 210                         capab |= WLAN_CAPABILITY_PRIVACY;
 211                 if (bss->wmm_used)
 212                         wmm = 1;
 213
 214                 /* get all rates supported by the device and the AP as
 215                  * some APs don't like getting a superset of their rates
 216                  * in the association request (e.g. D-Link DAP 1353 in
 217                  * b-only mode) */
 218                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 219
 220                 if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 221                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 222                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 223
 224                 ieee80211_rx_bss_put(local, bss);
 225         } else {
 226                 rates = ~0;
 227                 rates_len = sband->n_bitrates;
 228         }
 229
 230         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 231         memset(mgmt, 0, 24);
 232         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 233         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 234         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 235
 236         if (ifmgd->flags & IEEE80211_STA_PREV_BSSID_SET) {
 237                 skb_put(skb, 10);
 238                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 239                                                   IEEE80211_STYPE_REASSOC_REQ);
 240                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 241                 mgmt->u.reassoc_req.listen_interval =
 242                                 cpu_to_le16(local->hw.conf.listen_interval);
 243                 memcpy(mgmt->u.reassoc_req.current_ap, ifmgd->prev_bssid,
 244                        ETH_ALEN);
 245         } else {
 246                 skb_put(skb, 4);
 247                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 248                                                   IEEE80211_STYPE_ASSOC_REQ);
 249                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 250                 mgmt->u.assoc_req.listen_interval =
 251                                 cpu_to_le16(local->hw.conf.listen_interval);
 252         }
 253
 254         /* SSID */
 255         ies = pos = skb_put(skb, 2 + ifmgd->ssid_len);
 256         *pos++ = WLAN_EID_SSID;
 257         *pos++ = ifmgd->ssid_len;
 258         memcpy(pos, ifmgd->ssid, ifmgd->ssid_len);
 259
 260         /* add all rates which were marked to be used above */
 261         supp_rates_len = rates_len;
 262         if (supp_rates_len > 8)
 263                 supp_rates_len = 8;
 264
 265         len = sband->n_bitrates;
 266         pos = skb_put(skb, supp_rates_len + 2);
 267         *pos++ = WLAN_EID_SUPP_RATES;
 268         *pos++ = supp_rates_len;
 269
 270         count = 0;
 271         for (i = 0; i < sband->n_bitrates; i++) {
 272                 if (BIT(i) & rates) {
 273                         int rate = sband->bitrates[i].bitrate;
 274                         *pos++ = (u8) (rate / 5);
 275                         if (++count == 8)
 276                                 break;
 277                 }
 278         }
 279
 280         if (rates_len > count) {
 281                 pos = skb_put(skb, rates_len - count + 2);
 282                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 283                 *pos++ = rates_len - count;
 284
 285                 for (i++; i < sband->n_bitrates; i++) {
 286                         if (BIT(i) & rates) {
 287                                 int rate = sband->bitrates[i].bitrate;
 288                                 *pos++ = (u8) (rate / 5);
 289                         }
 290                 }
 291         }
 292
 293         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 294                 /* 1. power capabilities */
 295                 pos = skb_put(skb, 4);
 296                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 297                 *pos++ = 2;
 298                 *pos++ = 0; /* min tx power */
 299                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 300
 301                 /* 2. supported channels */
 302                 /* TODO: get this in reg domain format */
 303                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 304                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 305                 *pos++ = 2 * sband->n_channels;
 306                 for (i = 0; i < sband->n_channels; i++) {
 307                         *pos++ = ieee80211_frequency_to_channel(
 308                                         sband->channels[i].center_freq);
 309                         *pos++ = 1; /* one channel in the subband*/
 310                 }
 311         }
 312
 313         if (ifmgd->extra_ie) {
 314                 pos = skb_put(skb, ifmgd->extra_ie_len);
 315                 memcpy(pos, ifmgd->extra_ie, ifmgd->extra_ie_len);
 316         }
 317
 318         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
 319                 pos = skb_put(skb, 9);
 320                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 321                 *pos++ = 7; /* len */
 322                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 323                 *pos++ = 0x50;
 324                 *pos++ = 0xf2;
 325                 *pos++ = 2; /* WME */
 326                 *pos++ = 0; /* WME info */
 327                 *pos++ = 1; /* WME ver */
 328                 *pos++ = 0;
 329         }
 330
 331         /* wmm support is a must to HT */
 332         /*
 333          * IEEE802.11n does not allow TKIP/WEP as pairwise
 334          * ciphers in HT mode. We still associate in non-ht
 335          * mode (11a/b/g) if any one of these ciphers is
 336          * configured as pairwise.
 337          */
 338         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
 339             sband->ht_cap.ht_supported &&
 340             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
 341             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 342             (!(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))) {
 343                 struct ieee80211_ht_info *ht_info =
 344                         (struct ieee80211_ht_info *)(ht_ie + 2);
 345                 u16 cap = sband->ht_cap.cap;
 346                 __le16 tmp;
 347                 u32 flags = local->hw.conf.channel->flags;
 348
 349                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 350                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 351                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 352                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 353                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 354                         }
 355                         break;
 356                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 357                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 358                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 359                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 360                         }
 361                         break;
 362                 }
 363
 364                 tmp = cpu_to_le16(cap);
 365                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 366                 *pos++ = WLAN_EID_HT_CAPABILITY;
 367                 *pos++ = sizeof(struct ieee80211_ht_cap);
 368                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 369                 memcpy(pos, &tmp, sizeof(u16));
 370                 pos += sizeof(u16);
 371                 /* TODO: needs a define here for << 2 */
 372                 *pos++ = sband->ht_cap.ampdu_factor |
 373                          (sband->ht_cap.ampdu_density << 2);
 374                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 375         }
 376
 377         kfree(ifmgd->assocreq_ies);
 378         ifmgd->assocreq_ies_len = (skb->data + skb->len) - ies;
 379         ifmgd->assocreq_ies = kmalloc(ifmgd->assocreq_ies_len, GFP_KERNEL);
 380         if (ifmgd->assocreq_ies)
 381                 memcpy(ifmgd->assocreq_ies, ies, ifmgd->assocreq_ies_len);
 382
 383         ieee80211_tx_skb(sdata, skb, 0);
 384 }
 385
 386
 387 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 388                                            u16 stype, u16 reason)
 389 {
 390         struct ieee80211_local *local = sdata->local;
 391         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 392         struct sk_buff *skb;
 393         struct ieee80211_mgmt *mgmt;
 394
 395         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 396         if (!skb) {
 397                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 398                        "deauth/disassoc frame\n", sdata->dev->name);
 399                 return;
 400         }
 401         skb_reserve(skb, local->hw.extra_tx_headroom);
 402
 403         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 404         memset(mgmt, 0, 24);
 405         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 406         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 407         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 408         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 409         skb_put(skb, 2);
 410         /* u.deauth.reason_code == u.disassoc.reason_code */
 411         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 412
 413         if (stype == IEEE80211_STYPE_DEAUTH)
 414                 cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, skb->len);
 415         else
 416                 cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, skb->len);
 417         ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
 418 }
 419
 420 void ieee80211_send_pspoll(struct ieee80211_local *local,
 421                            struct ieee80211_sub_if_data *sdata)
 422 {
 423         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 424         struct ieee80211_pspoll *pspoll;
 425         struct sk_buff *skb;
 426         u16 fc;
 427
 428         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 429         if (!skb) {
 430                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 431                        "pspoll frame\n", sdata->dev->name);
 432                 return;
 433         }
 434         skb_reserve(skb, local->hw.extra_tx_headroom);
 435
 436         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 437         memset(pspoll, 0, sizeof(*pspoll));
 438         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 439         pspoll->frame_control = cpu_to_le16(fc);
 440         pspoll->aid = cpu_to_le16(ifmgd->aid);
 441
 442         /* aid in PS-Poll has its two MSBs each set to 1 */
 443         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 444
 445         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
 446         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
 447
 448         ieee80211_tx_skb(sdata, skb, 0);
 449 }
 450
 451 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 452                              struct ieee80211_sub_if_data *sdata,
 453                              int powersave)
 454 {
 455         struct sk_buff *skb;
 456         struct ieee80211_hdr *nullfunc;
 457         __le16 fc;
 458
 459         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 460                 return;
 461
 462         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
 463         if (!skb) {
 464                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
 465                        "frame\n", sdata->dev->name);
 466                 return;
 467         }
 468         skb_reserve(skb, local->hw.extra_tx_headroom);
 469
 470         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
 471         memset(nullfunc, 0, 24);
 472         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 473                          IEEE80211_FCTL_TODS);
 474         if (powersave)
 475                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
 476         nullfunc->frame_control = fc;
 477         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 478         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
 479         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 480
 481         ieee80211_tx_skb(sdata, skb, 0);
 482 }
 483
 484 /* powersave */
 485 static void ieee80211_enable_ps(struct ieee80211_local *local,
 486                                 struct ieee80211_sub_if_data *sdata)
 487 {
 488         struct ieee80211_conf *conf = &local->hw.conf;
 489
 490         if (conf->dynamic_ps_timeout > 0 &&
 491             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 492                 mod_timer(&local->dynamic_ps_timer, jiffies +
 493                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 494         } else {
 495                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 496                         ieee80211_send_nullfunc(local, sdata, 1);
 497                 conf->flags |= IEEE80211_CONF_PS;
 498                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 499         }
 500 }
 501
 502 static void ieee80211_change_ps(struct ieee80211_local *local)
 503 {
 504         struct ieee80211_conf *conf = &local->hw.conf;
 505
 506         if (local->ps_sdata) {
 507                 if (!(local->ps_sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED))
 508                         return;
 509
 510                 ieee80211_enable_ps(local, local->ps_sdata);
 511         } else if (conf->flags & IEEE80211_CONF_PS) {
 512                 conf->flags &= ~IEEE80211_CONF_PS;
 513                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 514                 del_timer_sync(&local->dynamic_ps_timer);
 515                 cancel_work_sync(&local->dynamic_ps_enable_work);
 516         }
 517 }
 518
 519 /* need to hold RTNL or interface lock */
 520 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 521 {
 522         struct ieee80211_sub_if_data *sdata, *found = NULL;
 523         int count = 0;
 524
 525         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 526                 local->ps_sdata = NULL;
 527                 return;
 528         }
 529
 530         list_for_each_entry(sdata, &local->interfaces, list) {
 531                 if (!netif_running(sdata->dev))
 532                         continue;
 533                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 534                         continue;
 535                 found = sdata;
 536                 count++;
 537         }
 538
 539         if (count == 1 && found->u.mgd.powersave) {
 540                 s32 beaconint_us;
 541
 542                 if (latency < 0)
 543                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 544
 545                 beaconint_us = ieee80211_tu_to_usec(
 546                                         found->vif.bss_conf.beacon_int);
 547
 548                 if (beaconint_us > latency)
 549                         local->ps_sdata = NULL;
 550                 else
 551                         local->ps_sdata = found;
 552         } else {
 553                 local->ps_sdata = NULL;
 554         }
 555
 556         ieee80211_change_ps(local);
 557 }
 558
 559 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 560 {
 561         struct ieee80211_local *local =
 562                 container_of(work, struct ieee80211_local,
 563                              dynamic_ps_disable_work);
 564
 565         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 566                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 567                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 568         }
 569
 570         ieee80211_wake_queues_by_reason(&local->hw,
 571                                         IEEE80211_QUEUE_STOP_REASON_PS);
 572 }
 573
 574 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 575 {
 576         struct ieee80211_local *local =
 577                 container_of(work, struct ieee80211_local,
 578                              dynamic_ps_enable_work);
 579         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 580
 581         /* can only happen when PS was just disabled anyway */
 582         if (!sdata)
 583                 return;
 584
 585         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 586                 return;
 587
 588         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 589                 ieee80211_send_nullfunc(local, sdata, 1);
 590
 591         local->hw.conf.flags |= IEEE80211_CONF_PS;
 592         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 593 }
 594
 595 void ieee80211_dynamic_ps_timer(unsigned long data)
 596 {
 597         struct ieee80211_local *local = (void *) data;
 598
 599         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
 600 }
 601
 602 /* MLME */
 603 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 604                                      struct ieee80211_if_managed *ifmgd,
 605                                      u8 *wmm_param, size_t wmm_param_len)
 606 {
 607         struct ieee80211_tx_queue_params params;
 608         size_t left;
 609         int count;
 610         u8 *pos;
 611
 612         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
 613                 return;
 614
 615         if (!wmm_param)
 616                 return;
 617
 618         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 619                 return;
 620         count = wmm_param[6] & 0x0f;
 621         if (count == ifmgd->wmm_last_param_set)
 622                 return;
 623         ifmgd->wmm_last_param_set = count;
 624
 625         pos = wmm_param + 8;
 626         left = wmm_param_len - 8;
 627
 628         memset(&params, 0, sizeof(params));
 629
 630         local->wmm_acm = 0;
 631         for (; left >= 4; left -= 4, pos += 4) {
 632                 int aci = (pos[0] >> 5) & 0x03;
 633                 int acm = (pos[0] >> 4) & 0x01;
 634                 int queue;
 635
 636                 switch (aci) {
 637                 case 1: /* AC_BK */
 638                         queue = 3;
 639                         if (acm)
 640                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 641                         break;
 642                 case 2: /* AC_VI */
 643                         queue = 1;
 644                         if (acm)
 645                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 646                         break;
 647                 case 3: /* AC_VO */
 648                         queue = 0;
 649                         if (acm)
 650                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 651                         break;
 652                 case 0: /* AC_BE */
 653                 default:
 654                         queue = 2;
 655                         if (acm)
 656                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 657                         break;
 658                 }
 659
 660                 params.aifs = pos[0] & 0x0f;
 661                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 662                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 663                 params.txop = get_unaligned_le16(pos + 2);
 664 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 665                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 666                        "cWmin=%d cWmax=%d txop=%d\n",
 667                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 668                        params.cw_max, params.txop);
 669 #endif
 670                 if (local->ops->conf_tx &&
 671                     local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 672                         printk(KERN_DEBUG "%s: failed to set TX queue "
 673                                "parameters for queue %d\n", local->mdev->name, queue);
 674                 }
 675         }
 676 }
 677
 678 static bool ieee80211_check_tim(struct ieee802_11_elems *elems, u16 aid)
 679 {
 680         u8 mask;
 681         u8 index, indexn1, indexn2;
 682         struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
 683
 684         if (unlikely(!tim || elems->tim_len < 4))
 685                 return false;
 686
 687         aid &= 0x3fff;
 688         index = aid / 8;
 689         mask  = 1 << (aid & 7);
 690
 691         indexn1 = tim->bitmap_ctrl & 0xfe;
 692         indexn2 = elems->tim_len + indexn1 - 4;
 693
 694         if (index < indexn1 || index > indexn2)
 695                 return false;
 696
 697         index -= indexn1;
 698
 699         return !!(tim->virtual_map[index] & mask);
 700 }
 701
 702 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 703                                            u16 capab, bool erp_valid, u8 erp)
 704 {
 705         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 706 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 707         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 708 #endif
 709         u32 changed = 0;
 710         bool use_protection;
 711         bool use_short_preamble;
 712         bool use_short_slot;
 713
 714         if (erp_valid) {
 715                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 716                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 717         } else {
 718                 use_protection = false;
 719                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 720         }
 721
 722         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 723
 724         if (use_protection != bss_conf->use_cts_prot) {
 725 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 726                 if (net_ratelimit()) {
 727                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 728                                sdata->dev->name,
 729                                use_protection ? "enabled" : "disabled",
 730                                ifmgd->bssid);
 731                 }
 732 #endif
 733                 bss_conf->use_cts_prot = use_protection;
 734                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 735         }
 736
 737         if (use_short_preamble != bss_conf->use_short_preamble) {
 738 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 739                 if (net_ratelimit()) {
 740                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 741                                " (BSSID=%pM)\n",
 742                                sdata->dev->name,
 743                                use_short_preamble ? "short" : "long",
 744                                ifmgd->bssid);
 745                 }
 746 #endif
 747                 bss_conf->use_short_preamble = use_short_preamble;
 748                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 749         }
 750
 751         if (use_short_slot != bss_conf->use_short_slot) {
 752 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 753                 if (net_ratelimit()) {
 754                         printk(KERN_DEBUG "%s: switched to %s slot time"
 755                                " (BSSID=%pM)\n",
 756                                sdata->dev->name,
 757                                use_short_slot ? "short" : "long",
 758                                ifmgd->bssid);
 759                 }
 760 #endif
 761                 bss_conf->use_short_slot = use_short_slot;
 762                 changed |= BSS_CHANGED_ERP_SLOT;
 763         }
 764
 765         return changed;
 766 }
 767
 768 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata)
 769 {
 770         union iwreq_data wrqu;
 771
 772         memset(&wrqu, 0, sizeof(wrqu));
 773         if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED)
 774                 memcpy(wrqu.ap_addr.sa_data, sdata->u.mgd.bssid, ETH_ALEN);
 775         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 776         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 777 }
 778
 779 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata)
 780 {
 781         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 782         char *buf;
 783         size_t len;
 784         int i;
 785         union iwreq_data wrqu;
 786
 787         if (!ifmgd->assocreq_ies && !ifmgd->assocresp_ies)
 788                 return;
 789
 790         buf = kmalloc(50 + 2 * (ifmgd->assocreq_ies_len +
 791                                 ifmgd->assocresp_ies_len), GFP_KERNEL);
 792         if (!buf)
 793                 return;
 794
 795         len = sprintf(buf, "ASSOCINFO(");
 796         if (ifmgd->assocreq_ies) {
 797                 len += sprintf(buf + len, "ReqIEs=");
 798                 for (i = 0; i < ifmgd->assocreq_ies_len; i++) {
 799                         len += sprintf(buf + len, "%02x",
 800                                        ifmgd->assocreq_ies[i]);
 801                 }
 802         }
 803         if (ifmgd->assocresp_ies) {
 804                 if (ifmgd->assocreq_ies)
 805                         len += sprintf(buf + len, " ");
 806                 len += sprintf(buf + len, "RespIEs=");
 807                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 808                         len += sprintf(buf + len, "%02x",
 809                                        ifmgd->assocresp_ies[i]);
 810                 }
 811         }
 812         len += sprintf(buf + len, ")");
 813
 814         if (len > IW_CUSTOM_MAX) {
 815                 len = sprintf(buf, "ASSOCRESPIE=");
 816                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 817                         len += sprintf(buf + len, "%02x",
 818                                        ifmgd->assocresp_ies[i]);
 819                 }
 820         }
 821
 822         if (len <= IW_CUSTOM_MAX) {
 823                 memset(&wrqu, 0, sizeof(wrqu));
 824                 wrqu.data.length = len;
 825                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 826         }
 827
 828         kfree(buf);
 829 }
 830
 831
 832 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 833                                      u32 bss_info_changed)
 834 {
 835         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 836         struct ieee80211_local *local = sdata->local;
 837         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 838
 839         struct ieee80211_bss *bss;
 840
 841         bss_info_changed |= BSS_CHANGED_ASSOC;
 842         ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
 843
 844         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 845                                    conf->channel->center_freq,
 846                                    ifmgd->ssid, ifmgd->ssid_len);
 847         if (bss) {
 848                 /* set timing information */
 849                 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 850                 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 851                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 852
 853                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 854                         bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 855
 856                 cfg80211_hold_bss(&bss->cbss);
 857
 858                 ieee80211_rx_bss_put(local, bss);
 859         }
 860
 861         ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
 862         memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
 863         ieee80211_sta_send_associnfo(sdata);
 864
 865         ifmgd->last_probe = jiffies;
 866         ieee80211_led_assoc(local, 1);
 867
 868         sdata->vif.bss_conf.assoc = 1;
 869         /*
 870          * For now just always ask the driver to update the basic rateset
 871          * when we have associated, we aren't checking whether it actually
 872          * changed or not.
 873          */
 874         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 875         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 876
 877         /* will be same as sdata */
 878         if (local->ps_sdata)
 879                 ieee80211_enable_ps(local, sdata);
 880
 881         netif_tx_start_all_queues(sdata->dev);
 882         netif_carrier_on(sdata->dev);
 883
 884         ieee80211_sta_send_apinfo(sdata);
 885 }
 886
 887 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
 888 {
 889         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 890         struct ieee80211_local *local = sdata->local;
 891
 892         ifmgd->direct_probe_tries++;
 893         if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 894                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 895                        sdata->dev->name, ifmgd->bssid);
 896                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 897                 ieee80211_sta_send_apinfo(sdata);
 898
 899                 /*
 900                  * Most likely AP is not in the range so remove the
 901                  * bss information associated to the AP
 902                  */
 903                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 904                                 sdata->local->hw.conf.channel->center_freq,
 905                                 ifmgd->ssid, ifmgd->ssid_len);
 906
 907                 /*
 908                  * We might have a pending scan which had no chance to run yet
 909                  * due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
 910                  * Hence, queue the STAs work again
 911                  */
 912                 queue_work(local->hw.workqueue, &ifmgd->work);
 913                 return;
 914         }
 915
 916         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 917                         sdata->dev->name, ifmgd->bssid,
 918                         ifmgd->direct_probe_tries);
 919
 920         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 921
 922         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifmgd->request);
 923
 924         /* Direct probe is sent to broadcast address as some APs
 925          * will not answer to direct packet in unassociated state.
 926          */
 927         ieee80211_send_probe_req(sdata, NULL,
 928                                  ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
 929
 930         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 931 }
 932
 933
 934 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
 935 {
 936         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 937         struct ieee80211_local *local = sdata->local;
 938         u8 *ies;
 939         size_t ies_len;
 940
 941         ifmgd->auth_tries++;
 942         if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 943                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 944                        " timed out\n",
 945                        sdata->dev->name, ifmgd->bssid);
 946                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 947                 ieee80211_sta_send_apinfo(sdata);
 948                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 949                                 sdata->local->hw.conf.channel->center_freq,
 950                                 ifmgd->ssid, ifmgd->ssid_len);
 951
 952                 /*
 953                  * We might have a pending scan which had no chance to run yet
 954                  * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
 955                  * Hence, queue the STAs work again
 956                  */
 957                 queue_work(local->hw.workqueue, &ifmgd->work);
 958                 return;
 959         }
 960
 961         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
 962         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 963                sdata->dev->name, ifmgd->bssid);
 964
 965         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
 966                 ies = ifmgd->sme_auth_ie;
 967                 ies_len = ifmgd->sme_auth_ie_len;
 968         } else {
 969                 ies = NULL;
 970                 ies_len = 0;
 971         }
 972         ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len,
 973                             ifmgd->bssid, 0);
 974         ifmgd->auth_transaction = 2;
 975
 976         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 977 }
 978
 979 /*
 980  * The disassoc 'reason' argument can be either our own reason
 981  * if self disconnected or a reason code from the AP.
 982  */
 983 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 984                                    bool deauth, bool self_disconnected,
 985                                    u16 reason)
 986 {
 987         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 988         struct ieee80211_local *local = sdata->local;
 989         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 990         struct ieee80211_bss *bss;
 991         struct sta_info *sta;
 992         u32 changed = 0, config_changed = 0;
 993
 994         rcu_read_lock();
 995
 996         sta = sta_info_get(local, ifmgd->bssid);
 997         if (!sta) {
 998                 rcu_read_unlock();
 999                 return;
1000         }
1001
1002         if (deauth) {
1003                 ifmgd->direct_probe_tries = 0;
1004                 ifmgd->auth_tries = 0;
1005         }
1006         ifmgd->assoc_scan_tries = 0;
1007         ifmgd->assoc_tries = 0;
1008
1009         netif_tx_stop_all_queues(sdata->dev);
1010         netif_carrier_off(sdata->dev);
1011
1012         ieee80211_sta_tear_down_BA_sessions(sta);
1013
1014         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1015                                    conf->channel->center_freq,
1016                                    ifmgd->ssid, ifmgd->ssid_len);
1017
1018         if (bss) {
1019                 cfg80211_unhold_bss(&bss->cbss);
1020                 ieee80211_rx_bss_put(local, bss);
1021         }
1022
1023         if (self_disconnected) {
1024                 if (deauth)
1025                         ieee80211_send_deauth_disassoc(sdata,
1026                                 IEEE80211_STYPE_DEAUTH, reason);
1027                 else
1028                         ieee80211_send_deauth_disassoc(sdata,
1029                                 IEEE80211_STYPE_DISASSOC, reason);
1030         }
1031
1032         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1033         changed |= ieee80211_reset_erp_info(sdata);
1034
1035         ieee80211_led_assoc(local, 0);
1036         changed |= BSS_CHANGED_ASSOC;
1037         sdata->vif.bss_conf.assoc = false;
1038
1039         ieee80211_sta_send_apinfo(sdata);
1040
1041         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
1042                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1043                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1044                                 sdata->local->hw.conf.channel->center_freq,
1045                                 ifmgd->ssid, ifmgd->ssid_len);
1046         }
1047
1048         rcu_read_unlock();
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_sta_send_apinfo(sdata);
1131                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1132                                 sdata->local->hw.conf.channel->center_freq,
1133                                 ifmgd->ssid, ifmgd->ssid_len);
1134                 /*
1135                  * We might have a pending scan which had no chance to run yet
1136                  * due to state == IEEE80211_STA_MLME_ASSOCIATE.
1137                  * Hence, queue the STAs work again
1138                  */
1139                 queue_work(local->hw.workqueue, &ifmgd->work);
1140                 return;
1141         }
1142
1143         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1144         printk(KERN_DEBUG "%s: associate with AP %pM\n",
1145                sdata->dev->name, ifmgd->bssid);
1146         if (ieee80211_privacy_mismatch(sdata)) {
1147                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1148                        "mixed-cell disabled - abort association\n", sdata->dev->name);
1149                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1150                 return;
1151         }
1152
1153         ieee80211_send_assoc(sdata);
1154
1155         mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1156 }
1157
1158 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1159                              struct ieee80211_hdr *hdr)
1160 {
1161         /*
1162          * We can postpone the mgd.timer whenever receiving unicast frames
1163          * from AP because we know that the connection is working both ways
1164          * at that time. But multicast frames (and hence also beacons) must
1165          * be ignored here, because we need to trigger the timer during
1166          * data idle periods for sending the periodical probe request to
1167          * the AP.
1168          */
1169         if (!is_multicast_ether_addr(hdr->addr1))
1170                 mod_timer(&sdata->u.mgd.timer,
1171                           jiffies + IEEE80211_MONITORING_INTERVAL);
1172 }
1173
1174 void ieee80211_beacon_loss_work(struct work_struct *work)
1175 {
1176         struct ieee80211_sub_if_data *sdata =
1177                 container_of(work, struct ieee80211_sub_if_data,
1178                              u.mgd.beacon_loss_work);
1179         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1180
1181 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1182         if (net_ratelimit()) {
1183                 printk(KERN_DEBUG "%s: driver reports beacon loss from AP %pM "
1184                        "- sending probe request\n", sdata->dev->name,
1185                        sdata->u.mgd.bssid);
1186         }
1187 #endif
1188
1189         ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1190         ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1191                                  ifmgd->ssid_len, NULL, 0);
1192
1193         mod_timer(&ifmgd->timer, jiffies + IEEE80211_MONITORING_INTERVAL);
1194 }
1195
1196 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1197 {
1198         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1199
1200         queue_work(sdata->local->hw.workqueue,
1201                    &sdata->u.mgd.beacon_loss_work);
1202 }
1203 EXPORT_SYMBOL(ieee80211_beacon_loss);
1204
1205 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
1206 {
1207         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1208         struct ieee80211_local *local = sdata->local;
1209         struct sta_info *sta;
1210         bool disassoc = false;
1211
1212         /* TODO: start monitoring current AP signal quality and number of
1213          * missed beacons. Scan other channels every now and then and search
1214          * for better APs. */
1215         /* TODO: remove expired BSSes */
1216
1217         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
1218
1219         rcu_read_lock();
1220
1221         sta = sta_info_get(local, ifmgd->bssid);
1222         if (!sta) {
1223                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1224                        sdata->dev->name, ifmgd->bssid);
1225                 disassoc = true;
1226                 goto unlock;
1227         }
1228
1229         if ((ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) &&
1230             time_after(jiffies, sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1231                 printk(KERN_DEBUG "%s: no probe response from AP %pM "
1232                        "- disassociating\n",
1233                        sdata->dev->name, ifmgd->bssid);
1234                 disassoc = true;
1235                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1236                 goto unlock;
1237         }
1238
1239         /*
1240          * Beacon filtering is only enabled with power save and then the
1241          * stack should not check for beacon loss.
1242          */
1243         if (!((local->hw.flags & IEEE80211_HW_BEACON_FILTER) &&
1244               (local->hw.conf.flags & IEEE80211_CONF_PS)) &&
1245             time_after(jiffies,
1246                        ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) {
1247 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1248                 if (net_ratelimit()) {
1249                         printk(KERN_DEBUG "%s: beacon loss from AP %pM "
1250                                "- sending probe request\n",
1251                                sdata->dev->name, ifmgd->bssid);
1252                 }
1253 #endif
1254                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1255                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1256                                          ifmgd->ssid_len, NULL, 0);
1257                 goto unlock;
1258
1259         }
1260
1261         if (time_after(jiffies, sta->last_rx + IEEE80211_PROBE_IDLE_TIME)) {
1262                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1263                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1264                                          ifmgd->ssid_len, NULL, 0);
1265         }
1266
1267  unlock:
1268         rcu_read_unlock();
1269
1270         if (disassoc)
1271                 ieee80211_set_disassoc(sdata, true, true,
1272                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1273         else
1274                 mod_timer(&ifmgd->timer, jiffies +
1275                                       IEEE80211_MONITORING_INTERVAL);
1276 }
1277
1278
1279 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
1280 {
1281         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1282
1283         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1284         ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
1285         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1286                 /* Wait for SME to request association */
1287                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1288         } else
1289                 ieee80211_associate(sdata);
1290 }
1291
1292
1293 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1294                                      struct ieee80211_mgmt *mgmt,
1295                                      size_t len)
1296 {
1297         u8 *pos;
1298         struct ieee802_11_elems elems;
1299
1300         pos = mgmt->u.auth.variable;
1301         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1302         if (!elems.challenge)
1303                 return;
1304         ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
1305                             elems.challenge - 2, elems.challenge_len + 2,
1306                             sdata->u.mgd.bssid, 1);
1307         sdata->u.mgd.auth_transaction = 4;
1308 }
1309
1310 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1311                                    struct ieee80211_mgmt *mgmt,
1312                                    size_t len)
1313 {
1314         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1315         u16 auth_alg, auth_transaction, status_code;
1316
1317         if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1318                 return;
1319
1320         if (len < 24 + 6)
1321                 return;
1322
1323         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1324                 return;
1325
1326         if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1327                 return;
1328
1329         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1330         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1331         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1332
1333         if (auth_alg != ifmgd->auth_alg ||
1334             auth_transaction != ifmgd->auth_transaction)
1335                 return;
1336
1337         if (status_code != WLAN_STATUS_SUCCESS) {
1338                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1339                         u8 algs[3];
1340                         const int num_algs = ARRAY_SIZE(algs);
1341                         int i, pos;
1342                         algs[0] = algs[1] = algs[2] = 0xff;
1343                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1344                                 algs[0] = WLAN_AUTH_OPEN;
1345                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1346                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1347                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1348                                 algs[2] = WLAN_AUTH_LEAP;
1349                         if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1350                                 pos = 0;
1351                         else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1352                                 pos = 1;
1353                         else
1354                                 pos = 2;
1355                         for (i = 0; i < num_algs; i++) {
1356                                 pos++;
1357                                 if (pos >= num_algs)
1358                                         pos = 0;
1359                                 if (algs[pos] == ifmgd->auth_alg ||
1360                                     algs[pos] == 0xff)
1361                                         continue;
1362                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1363                                     !ieee80211_sta_wep_configured(sdata))
1364                                         continue;
1365                                 ifmgd->auth_alg = algs[pos];
1366                                 break;
1367                         }
1368                 }
1369                 return;
1370         }
1371
1372         switch (ifmgd->auth_alg) {
1373         case WLAN_AUTH_OPEN:
1374         case WLAN_AUTH_LEAP:
1375         case WLAN_AUTH_FT:
1376                 ieee80211_auth_completed(sdata);
1377                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1378                 break;
1379         case WLAN_AUTH_SHARED_KEY:
1380                 if (ifmgd->auth_transaction == 4) {
1381                         ieee80211_auth_completed(sdata);
1382                         cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1383                 } else
1384                         ieee80211_auth_challenge(sdata, mgmt, len);
1385                 break;
1386         }
1387 }
1388
1389
1390 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1391                                      struct ieee80211_mgmt *mgmt,
1392                                      size_t len)
1393 {
1394         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1395         u16 reason_code;
1396
1397         if (len < 24 + 2)
1398                 return;
1399
1400         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1401                 return;
1402
1403         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1404
1405         if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1406                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1407                                 sdata->dev->name, reason_code);
1408
1409         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1410             (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1411              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1412              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)) {
1413                 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1414                 mod_timer(&ifmgd->timer, jiffies +
1415                                       IEEE80211_RETRY_AUTH_INTERVAL);
1416         }
1417
1418         ieee80211_set_disassoc(sdata, true, false, 0);
1419         ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1420         cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, len);
1421 }
1422
1423
1424 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1425                                        struct ieee80211_mgmt *mgmt,
1426                                        size_t len)
1427 {
1428         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1429         u16 reason_code;
1430
1431         if (len < 24 + 2)
1432                 return;
1433
1434         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1435                 return;
1436
1437         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1438
1439         if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1440                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1441                                 sdata->dev->name, reason_code);
1442
1443         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1444             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1445                 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1446                 mod_timer(&ifmgd->timer, jiffies +
1447                                       IEEE80211_RETRY_AUTH_INTERVAL);
1448         }
1449
1450         ieee80211_set_disassoc(sdata, false, false, reason_code);
1451         cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, len);
1452 }
1453
1454
1455 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1456                                          struct ieee80211_mgmt *mgmt,
1457                                          size_t len,
1458                                          int reassoc)
1459 {
1460         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1461         struct ieee80211_local *local = sdata->local;
1462         struct ieee80211_supported_band *sband;
1463         struct sta_info *sta;
1464         u32 rates, basic_rates;
1465         u16 capab_info, status_code, aid;
1466         struct ieee802_11_elems elems;
1467         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1468         u8 *pos;
1469         u32 changed = 0;
1470         int i, j;
1471         bool have_higher_than_11mbit = false, newsta = false;
1472         u16 ap_ht_cap_flags;
1473
1474         /* AssocResp and ReassocResp have identical structure, so process both
1475          * of them in this function. */
1476
1477         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1478                 return;
1479
1480         if (len < 24 + 6)
1481                 return;
1482
1483         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1484                 return;
1485
1486         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1487         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1488         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1489
1490         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1491                "status=%d aid=%d)\n",
1492                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1493                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1494
1495         pos = mgmt->u.assoc_resp.variable;
1496         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1497
1498         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1499             elems.timeout_int && elems.timeout_int_len == 5 &&
1500             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1501                 u32 tu, ms;
1502                 tu = get_unaligned_le32(elems.timeout_int + 1);
1503                 ms = tu * 1024 / 1000;
1504                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1505                        "comeback duration %u TU (%u ms)\n",
1506                        sdata->dev->name, tu, ms);
1507                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1508                         mod_timer(&ifmgd->timer,
1509                                   jiffies + msecs_to_jiffies(ms));
1510                 return;
1511         }
1512
1513         if (status_code != WLAN_STATUS_SUCCESS) {
1514                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1515                        sdata->dev->name, status_code);
1516                 /* if this was a reassociation, ensure we try a "full"
1517                  * association next time. This works around some broken APs
1518                  * which do not correctly reject reassociation requests. */
1519                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1520                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1521                 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1522                         /* Wait for SME to decide what to do next */
1523                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1524                 }
1525                 return;
1526         }
1527
1528         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1529                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1530                        "set\n", sdata->dev->name, aid);
1531         aid &= ~(BIT(15) | BIT(14));
1532
1533         if (!elems.supp_rates) {
1534                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1535                        sdata->dev->name);
1536                 return;
1537         }
1538
1539         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1540         ifmgd->aid = aid;
1541         ifmgd->ap_capab = capab_info;
1542
1543         kfree(ifmgd->assocresp_ies);
1544         ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1545         ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1546         if (ifmgd->assocresp_ies)
1547                 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1548
1549         rcu_read_lock();
1550
1551         /* Add STA entry for the AP */
1552         sta = sta_info_get(local, ifmgd->bssid);
1553         if (!sta) {
1554                 newsta = true;
1555
1556                 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1557                 if (!sta) {
1558                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1559                                " the AP\n", sdata->dev->name);
1560                         rcu_read_unlock();
1561                         return;
1562                 }
1563
1564                 /* update new sta with its last rx activity */
1565                 sta->last_rx = jiffies;
1566         }
1567
1568         /*
1569          * FIXME: Do we really need to update the sta_info's information here?
1570          *        We already know about the AP (we found it in our list) so it
1571          *        should already be filled with the right info, no?
1572          *        As is stands, all this is racy because typically we assume
1573          *        the information that is filled in here (except flags) doesn't
1574          *        change while a STA structure is alive. As such, it should move
1575          *        to between the sta_info_alloc() and sta_info_insert() above.
1576          */
1577
1578         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1579                            WLAN_STA_AUTHORIZED);
1580
1581         rates = 0;
1582         basic_rates = 0;
1583         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1584
1585         for (i = 0; i < elems.supp_rates_len; i++) {
1586                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1587                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1588
1589                 if (rate > 110)
1590                         have_higher_than_11mbit = true;
1591
1592                 for (j = 0; j < sband->n_bitrates; j++) {
1593                         if (sband->bitrates[j].bitrate == rate) {
1594                                 rates |= BIT(j);
1595                                 if (is_basic)
1596                                         basic_rates |= BIT(j);
1597                                 break;
1598                         }
1599                 }
1600         }
1601
1602         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1603                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1604                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1605
1606                 if (rate > 110)
1607                         have_higher_than_11mbit = true;
1608
1609                 for (j = 0; j < sband->n_bitrates; j++) {
1610                         if (sband->bitrates[j].bitrate == rate) {
1611                                 rates |= BIT(j);
1612                                 if (is_basic)
1613                                         basic_rates |= BIT(j);
1614                                 break;
1615                         }
1616                 }
1617         }
1618
1619         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1620         sdata->vif.bss_conf.basic_rates = basic_rates;
1621
1622         /* cf. IEEE 802.11 9.2.12 */
1623         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1624             have_higher_than_11mbit)
1625                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1626         else
1627                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1628
1629         /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1630         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1631                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1632                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1633
1634         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1635
1636         rate_control_rate_init(sta);
1637
1638         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1639                 set_sta_flags(sta, WLAN_STA_MFP);
1640
1641         if (elems.wmm_param)
1642                 set_sta_flags(sta, WLAN_STA_WME);
1643
1644         if (newsta) {
1645                 int err = sta_info_insert(sta);
1646                 if (err) {
1647                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1648                                " the AP (error %d)\n", sdata->dev->name, err);
1649                         rcu_read_unlock();
1650                         return;
1651                 }
1652         }
1653
1654         rcu_read_unlock();
1655
1656         if (elems.wmm_param)
1657                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1658                                          elems.wmm_param_len);
1659
1660         if (elems.ht_info_elem && elems.wmm_param &&
1661             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1662             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1663                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1664                                                ap_ht_cap_flags);
1665
1666         /* set AID and assoc capability,
1667          * ieee80211_set_associated() will tell the driver */
1668         bss_conf->aid = aid;
1669         bss_conf->assoc_capability = capab_info;
1670         ieee80211_set_associated(sdata, changed);
1671
1672         /*
1673          * initialise the time of last beacon to be the association time,
1674          * otherwise beacon loss check will trigger immediately
1675          */
1676         ifmgd->last_beacon = jiffies;
1677
1678         ieee80211_associated(sdata);
1679         cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1680 }
1681
1682
1683 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1684                                   struct ieee80211_mgmt *mgmt,
1685                                   size_t len,
1686                                   struct ieee80211_rx_status *rx_status,
1687                                   struct ieee802_11_elems *elems,
1688                                   bool beacon)
1689 {
1690         struct ieee80211_local *local = sdata->local;
1691         int freq;
1692         struct ieee80211_bss *bss;
1693         struct ieee80211_channel *channel;
1694
1695         if (elems->ds_params && elems->ds_params_len == 1)
1696                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1697         else
1698                 freq = rx_status->freq;
1699
1700         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1701
1702         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1703                 return;
1704
1705         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1706                                         channel, beacon);
1707         if (!bss)
1708                 return;
1709
1710         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1711             (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1712                 struct ieee80211_channel_sw_ie *sw_elem =
1713                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1714                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1715         }
1716
1717         ieee80211_rx_bss_put(local, bss);
1718 }
1719
1720
1721 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1722                                          struct ieee80211_mgmt *mgmt,
1723                                          size_t len,
1724                                          struct ieee80211_rx_status *rx_status)
1725 {
1726         struct ieee80211_if_managed *ifmgd;
1727         size_t baselen;
1728         struct ieee802_11_elems elems;
1729
1730         ifmgd = &sdata->u.mgd;
1731
1732         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1733                 return; /* ignore ProbeResp to foreign address */
1734
1735         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1736         if (baselen > len)
1737                 return;
1738
1739         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1740                                 &elems);
1741
1742         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1743
1744         /* direct probe may be part of the association flow */
1745         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1746                                &ifmgd->request)) {
1747                 printk(KERN_DEBUG "%s direct probe responded\n",
1748                        sdata->dev->name);
1749                 ieee80211_authenticate(sdata);
1750         }
1751
1752         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1753                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1754 }
1755
1756 /*
1757  * This is the canonical list of information elements we care about,
1758  * the filter code also gives us all changes to the Microsoft OUI
1759  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1760  *
1761  * We implement beacon filtering in software since that means we can
1762  * avoid processing the frame here and in cfg80211, and userspace
1763  * will not be able to tell whether the hardware supports it or not.
1764  *
1765  * XXX: This list needs to be dynamic -- userspace needs to be able to
1766  *      add items it requires. It also needs to be able to tell us to
1767  *      look out for other vendor IEs.
1768  */
1769 static const u64 care_about_ies =
1770         BIT(WLAN_EID_COUNTRY) |
1771         BIT(WLAN_EID_ERP_INFO) |
1772         BIT(WLAN_EID_CHANNEL_SWITCH) |
1773         BIT(WLAN_EID_PWR_CONSTRAINT) |
1774         BIT(WLAN_EID_HT_CAPABILITY) |
1775         BIT(WLAN_EID_HT_INFORMATION);
1776
1777 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1778                                      struct ieee80211_mgmt *mgmt,
1779                                      size_t len,
1780                                      struct ieee80211_rx_status *rx_status)
1781 {
1782         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1783         size_t baselen;
1784         struct ieee802_11_elems elems;
1785         struct ieee80211_local *local = sdata->local;
1786         u32 changed = 0;
1787         bool erp_valid, directed_tim = false;
1788         u8 erp_value = 0;
1789         u32 ncrc;
1790
1791         /* Process beacon from the current BSS */
1792         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1793         if (baselen > len)
1794                 return;
1795
1796         if (rx_status->freq != local->hw.conf.channel->center_freq)
1797                 return;
1798
1799         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1800             memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1801                 return;
1802
1803         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1804         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1805                                           len - baselen, &elems,
1806                                           care_about_ies, ncrc);
1807
1808         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1809                 directed_tim = ieee80211_check_tim(&elems, ifmgd->aid);
1810
1811         ncrc = crc32_be(ncrc, (void *)&directed_tim, sizeof(directed_tim));
1812
1813         if (ncrc == ifmgd->beacon_crc)
1814                 return;
1815         ifmgd->beacon_crc = ncrc;
1816
1817         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1818
1819         ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1820                                  elems.wmm_param_len);
1821
1822         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1823                 if (directed_tim) {
1824                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1825                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1826                                 ieee80211_hw_config(local,
1827                                                     IEEE80211_CONF_CHANGE_PS);
1828                                 ieee80211_send_nullfunc(local, sdata, 0);
1829                         } else {
1830                                 local->pspolling = true;
1831
1832                                 /*
1833                                  * Here is assumed that the driver will be
1834                                  * able to send ps-poll frame and receive a
1835                                  * response even though power save mode is
1836                                  * enabled, but some drivers might require
1837                                  * to disable power save here. This needs
1838                                  * to be investigated.
1839                                  */
1840                                 ieee80211_send_pspoll(local, sdata);
1841                         }
1842                 }
1843         }
1844
1845         if (elems.erp_info && elems.erp_info_len >= 1) {
1846                 erp_valid = true;
1847                 erp_value = elems.erp_info[0];
1848         } else {
1849                 erp_valid = false;
1850         }
1851         changed |= ieee80211_handle_bss_capability(sdata,
1852                         le16_to_cpu(mgmt->u.beacon.capab_info),
1853                         erp_valid, erp_value);
1854
1855
1856         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1857             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
1858                 struct sta_info *sta;
1859                 struct ieee80211_supported_band *sband;
1860                 u16 ap_ht_cap_flags;
1861
1862                 rcu_read_lock();
1863
1864                 sta = sta_info_get(local, ifmgd->bssid);
1865                 if (!sta) {
1866                         rcu_read_unlock();
1867                         return;
1868                 }
1869
1870                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1871
1872                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1873                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1874
1875                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1876
1877                 rcu_read_unlock();
1878
1879                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1880                                                ap_ht_cap_flags);
1881         }
1882
1883         if (elems.country_elem) {
1884                 /* Note we are only reviewing this on beacons
1885                  * for the BSSID we are associated to */
1886                 regulatory_hint_11d(local->hw.wiphy,
1887                         elems.country_elem, elems.country_elem_len);
1888
1889                 /* TODO: IBSS also needs this */
1890                 if (elems.pwr_constr_elem)
1891                         ieee80211_handle_pwr_constr(sdata,
1892                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1893                                 elems.pwr_constr_elem,
1894                                 elems.pwr_constr_elem_len);
1895         }
1896
1897         ieee80211_bss_info_change_notify(sdata, changed);
1898 }
1899
1900 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1901                                           struct sk_buff *skb,
1902                                           struct ieee80211_rx_status *rx_status)
1903 {
1904         struct ieee80211_local *local = sdata->local;
1905         struct ieee80211_mgmt *mgmt;
1906         u16 fc;
1907
1908         if (skb->len < 24)
1909                 return RX_DROP_MONITOR;
1910
1911         mgmt = (struct ieee80211_mgmt *) skb->data;
1912         fc = le16_to_cpu(mgmt->frame_control);
1913
1914         switch (fc & IEEE80211_FCTL_STYPE) {
1915         case IEEE80211_STYPE_PROBE_REQ:
1916         case IEEE80211_STYPE_PROBE_RESP:
1917         case IEEE80211_STYPE_BEACON:
1918                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1919         case IEEE80211_STYPE_AUTH:
1920         case IEEE80211_STYPE_ASSOC_RESP:
1921         case IEEE80211_STYPE_REASSOC_RESP:
1922         case IEEE80211_STYPE_DEAUTH:
1923         case IEEE80211_STYPE_DISASSOC:
1924                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1925                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1926                 return RX_QUEUED;
1927         }
1928
1929         return RX_DROP_MONITOR;
1930 }
1931
1932 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1933                                          struct sk_buff *skb)
1934 {
1935         struct ieee80211_rx_status *rx_status;
1936         struct ieee80211_mgmt *mgmt;
1937         u16 fc;
1938
1939         rx_status = (struct ieee80211_rx_status *) skb->cb;
1940         mgmt = (struct ieee80211_mgmt *) skb->data;
1941         fc = le16_to_cpu(mgmt->frame_control);
1942
1943         switch (fc & IEEE80211_FCTL_STYPE) {
1944         case IEEE80211_STYPE_PROBE_RESP:
1945                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
1946                                              rx_status);
1947                 break;
1948         case IEEE80211_STYPE_BEACON:
1949                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1950                                          rx_status);
1951                 break;
1952         case IEEE80211_STYPE_AUTH:
1953                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
1954                 break;
1955         case IEEE80211_STYPE_ASSOC_RESP:
1956                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
1957                 break;
1958         case IEEE80211_STYPE_REASSOC_RESP:
1959                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
1960                 break;
1961         case IEEE80211_STYPE_DEAUTH:
1962                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1963                 break;
1964         case IEEE80211_STYPE_DISASSOC:
1965                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1966                 break;
1967         }
1968
1969         kfree_skb(skb);
1970 }
1971
1972 static void ieee80211_sta_timer(unsigned long data)
1973 {
1974         struct ieee80211_sub_if_data *sdata =
1975                 (struct ieee80211_sub_if_data *) data;
1976         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1977         struct ieee80211_local *local = sdata->local;
1978
1979         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1980         queue_work(local->hw.workqueue, &ifmgd->work);
1981 }
1982
1983 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
1984 {
1985         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1986         struct ieee80211_local *local = sdata->local;
1987
1988         if (local->ops->reset_tsf) {
1989                 /* Reset own TSF to allow time synchronization work. */
1990                 local->ops->reset_tsf(local_to_hw(local));
1991         }
1992
1993         ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
1994
1995
1996         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1997                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1998         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1999                 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
2000         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2001                 ifmgd->auth_alg = WLAN_AUTH_LEAP;
2002         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT)
2003                 ifmgd->auth_alg = WLAN_AUTH_FT;
2004         else
2005                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
2006         ifmgd->auth_transaction = -1;
2007         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
2008         ifmgd->assoc_scan_tries = 0;
2009         ifmgd->direct_probe_tries = 0;
2010         ifmgd->auth_tries = 0;
2011         ifmgd->assoc_tries = 0;
2012         netif_tx_stop_all_queues(sdata->dev);
2013         netif_carrier_off(sdata->dev);
2014 }
2015
2016 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
2017 {
2018         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2019         struct ieee80211_local *local = sdata->local;
2020         struct ieee80211_bss *bss;
2021         u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
2022         u8 ssid_len = ifmgd->ssid_len;
2023         u16 capa_mask = WLAN_CAPABILITY_ESS;
2024         u16 capa_val = WLAN_CAPABILITY_ESS;
2025         struct ieee80211_channel *chan = local->oper_channel;
2026
2027         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
2028             ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2029                             IEEE80211_STA_AUTO_BSSID_SEL |
2030                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
2031                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
2032                 if (sdata->default_key)
2033                         capa_val |= WLAN_CAPABILITY_PRIVACY;
2034         }
2035
2036         if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2037                 chan = NULL;
2038
2039         if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2040                 bssid = NULL;
2041
2042         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
2043                 ssid = NULL;
2044                 ssid_len = 0;
2045         }
2046
2047         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
2048                                        bssid, ssid, ssid_len,
2049                                        capa_mask, capa_val);
2050
2051         if (bss) {
2052                 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
2053                 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
2054                         ieee80211_sta_set_ssid(sdata, bss->ssid,
2055                                                bss->ssid_len);
2056                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
2057                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
2058                                                     bss->supp_rates);
2059                 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
2060                         sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
2061                 else
2062                         sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
2063
2064                 /* Send out direct probe if no probe resp was received or
2065                  * the one we have is outdated
2066                  */
2067                 if (!bss->last_probe_resp ||
2068                     time_after(jiffies, bss->last_probe_resp
2069                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2070                         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2071                 else
2072                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2073
2074                 ieee80211_rx_bss_put(local, bss);
2075                 ieee80211_sta_reset_auth(sdata);
2076                 return 0;
2077         } else {
2078                 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2079                         ifmgd->assoc_scan_tries++;
2080                         /* XXX maybe racy? */
2081                         if (local->scan_req)
2082                                 return -1;
2083                         memcpy(local->int_scan_req.ssids[0].ssid,
2084                                ifmgd->ssid, IEEE80211_MAX_SSID_LEN);
2085                         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL)
2086                                 local->int_scan_req.ssids[0].ssid_len = 0;
2087                         else
2088                                 local->int_scan_req.ssids[0].ssid_len = ifmgd->ssid_len;
2089
2090                         if (ieee80211_start_scan(sdata, &local->int_scan_req))
2091                                 ieee80211_scan_failed(local);
2092
2093                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2094                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2095                 } else {
2096                         ifmgd->assoc_scan_tries = 0;
2097                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
2098                 }
2099         }
2100         return -1;
2101 }
2102
2103
2104 static void ieee80211_sta_work(struct work_struct *work)
2105 {
2106         struct ieee80211_sub_if_data *sdata =
2107                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2108         struct ieee80211_local *local = sdata->local;
2109         struct ieee80211_if_managed *ifmgd;
2110         struct sk_buff *skb;
2111
2112         if (!netif_running(sdata->dev))
2113                 return;
2114
2115         if (local->sw_scanning || local->hw_scanning)
2116                 return;
2117
2118         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2119                 return;
2120         ifmgd = &sdata->u.mgd;
2121
2122         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2123                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2124
2125         if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2126             ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2127             ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
2128             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
2129                 /*
2130                  * The call to ieee80211_start_scan can fail but ieee80211_request_scan
2131                  * (which queued ieee80211_sta_work) did not return an error. Thus, call
2132                  * ieee80211_scan_failed here if ieee80211_start_scan fails in order to
2133                  * notify the scan requester.
2134                  */
2135                 if (ieee80211_start_scan(sdata, local->scan_req))
2136                         ieee80211_scan_failed(local);
2137                 return;
2138         }
2139
2140         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
2141                 if (ieee80211_sta_config_auth(sdata))
2142                         return;
2143                 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2144         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
2145                 return;
2146
2147         switch (ifmgd->state) {
2148         case IEEE80211_STA_MLME_DISABLED:
2149                 break;
2150         case IEEE80211_STA_MLME_DIRECT_PROBE:
2151                 ieee80211_direct_probe(sdata);
2152                 break;
2153         case IEEE80211_STA_MLME_AUTHENTICATE:
2154                 ieee80211_authenticate(sdata);
2155                 break;
2156         case IEEE80211_STA_MLME_ASSOCIATE:
2157                 ieee80211_associate(sdata);
2158                 break;
2159         case IEEE80211_STA_MLME_ASSOCIATED:
2160                 ieee80211_associated(sdata);
2161                 break;
2162         default:
2163                 WARN_ON(1);
2164                 break;
2165         }
2166
2167         if (ieee80211_privacy_mismatch(sdata)) {
2168                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2169                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2170
2171                 ieee80211_set_disassoc(sdata, false, true,
2172                                         WLAN_REASON_UNSPECIFIED);
2173         }
2174 }
2175
2176 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2177 {
2178         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2179                 /*
2180                  * Need to update last_beacon to avoid beacon loss
2181                  * test to trigger.
2182                  */
2183                 sdata->u.mgd.last_beacon = jiffies;
2184
2185
2186                 queue_work(sdata->local->hw.workqueue,
2187                            &sdata->u.mgd.work);
2188         }
2189 }
2190
2191 /* interface setup */
2192 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2193 {
2194         struct ieee80211_if_managed *ifmgd;
2195         u32 hw_flags;
2196
2197         ifmgd = &sdata->u.mgd;
2198         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2199         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2200         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2201         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2202                     (unsigned long) sdata);
2203         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2204                     (unsigned long) sdata);
2205         skb_queue_head_init(&ifmgd->skb_queue);
2206
2207         ifmgd->capab = WLAN_CAPABILITY_ESS;
2208         ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2209                 IEEE80211_AUTH_ALG_SHARED_KEY;
2210         ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
2211                 IEEE80211_STA_AUTO_BSSID_SEL |
2212                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2213         if (sdata->local->hw.queues >= 4)
2214                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2215
2216         hw_flags = sdata->local->hw.flags;
2217
2218         if (hw_flags & IEEE80211_HW_SUPPORTS_PS) {
2219                 ifmgd->powersave = CONFIG_MAC80211_DEFAULT_PS_VALUE;
2220                 sdata->local->hw.conf.dynamic_ps_timeout = 500;
2221         }
2222 }
2223
2224 /* configuration hooks */
2225 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
2226 {
2227         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2228         struct ieee80211_local *local = sdata->local;
2229
2230         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2231                 return;
2232
2233         if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
2234                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2235             (ifmgd->flags & (IEEE80211_STA_SSID_SET |
2236                              IEEE80211_STA_AUTO_SSID_SEL))) {
2237
2238                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2239                         ieee80211_set_disassoc(sdata, true, true,
2240                                                WLAN_REASON_DEAUTH_LEAVING);
2241
2242                 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) ||
2243                     ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
2244                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2245                 else if (ifmgd->flags & IEEE80211_STA_EXT_SME)
2246                         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2247                 queue_work(local->hw.workqueue, &ifmgd->work);
2248         }
2249 }
2250
2251 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
2252 {
2253         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2254
2255         if (ifmgd->ssid_len)
2256                 ifmgd->flags |= IEEE80211_STA_SSID_SET;
2257         else
2258                 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
2259
2260         return 0;
2261 }
2262
2263 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2264 {
2265         struct ieee80211_if_managed *ifmgd;
2266
2267         if (len > IEEE80211_MAX_SSID_LEN)
2268                 return -EINVAL;
2269
2270         ifmgd = &sdata->u.mgd;
2271
2272         if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
2273                 /*
2274                  * Do not use reassociation if SSID is changed (different ESS).
2275                  */
2276                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2277                 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
2278                 memcpy(ifmgd->ssid, ssid, len);
2279                 ifmgd->ssid_len = len;
2280         }
2281
2282         return ieee80211_sta_commit(sdata);
2283 }
2284
2285 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2286 {
2287         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2288         memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
2289         *len = ifmgd->ssid_len;
2290         return 0;
2291 }
2292
2293 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2294 {
2295         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2296
2297         if (is_valid_ether_addr(bssid)) {
2298                 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
2299                 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
2300         } else {
2301                 memset(ifmgd->bssid, 0, ETH_ALEN);
2302                 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
2303         }
2304
2305         if (netif_running(sdata->dev)) {
2306                 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
2307                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2308                                "the low-level driver\n", sdata->dev->name);
2309                 }
2310         }
2311
2312         return ieee80211_sta_commit(sdata);
2313 }
2314
2315 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
2316                                const char *ie, size_t len)
2317 {
2318         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2319
2320         kfree(ifmgd->extra_ie);
2321         if (len == 0) {
2322                 ifmgd->extra_ie = NULL;
2323                 ifmgd->extra_ie_len = 0;
2324                 return 0;
2325         }
2326         ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
2327         if (!ifmgd->extra_ie) {
2328                 ifmgd->extra_ie_len = 0;
2329                 return -ENOMEM;
2330         }
2331         memcpy(ifmgd->extra_ie, ie, len);
2332         ifmgd->extra_ie_len = len;
2333         return 0;
2334 }
2335
2336 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2337 {
2338         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2339                sdata->dev->name, reason);
2340
2341         ieee80211_set_disassoc(sdata, true, true, reason);
2342         return 0;
2343 }
2344
2345 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2346 {
2347         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2348
2349         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2350                sdata->dev->name, reason);
2351
2352         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
2353                 return -ENOLINK;
2354
2355         ieee80211_set_disassoc(sdata, false, true, reason);
2356         return 0;
2357 }
2358
2359 /* scan finished notification */
2360 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2361 {
2362         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2363
2364         /* Restart STA timers */
2365         rcu_read_lock();
2366         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2367                 ieee80211_restart_sta_timer(sdata);
2368         rcu_read_unlock();
2369 }
2370
2371 int ieee80211_max_network_latency(struct notifier_block *nb,
2372                                   unsigned long data, void *dummy)
2373 {
2374         s32 latency_usec = (s32) data;
2375         struct ieee80211_local *local =
2376                 container_of(nb, struct ieee80211_local,
2377                              network_latency_notifier);
2378
2379         mutex_lock(&local->iflist_mtx);
2380         ieee80211_recalc_ps(local, latency_usec);
2381         mutex_unlock(&local->iflist_mtx);
2382
2383         return 0;
2384 }