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 "driver-ops.h"
  27 #include "rate.h"
  28 #include "led.h"
  29
  30 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
  31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  32 #define IEEE80211_AUTH_MAX_TRIES 3
  33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  34 #define IEEE80211_ASSOC_MAX_TRIES 3
  35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  36 #define IEEE80211_PROBE_IDLE_TIME (60 * HZ)
  37 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  38
  39 /* utils */
  40 static int ecw2cw(int ecw)
  41 {
  42         return (1 << ecw) - 1;
  43 }
  44
  45 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  46 {
  47         u8 *end, *pos;
  48
  49         pos = bss->cbss.information_elements;
  50         if (pos == NULL)
  51                 return NULL;
  52         end = pos + bss->cbss.len_information_elements;
  53
  54         while (pos + 1 < end) {
  55                 if (pos + 2 + pos[1] > end)
  56                         break;
  57                 if (pos[0] == ie)
  58                         return pos;
  59                 pos += 2 + pos[1];
  60         }
  61
  62         return NULL;
  63 }
  64
  65 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  66                                       struct ieee80211_supported_band *sband,
  67                                       u32 *rates)
  68 {
  69         int i, j, count;
  70         *rates = 0;
  71         count = 0;
  72         for (i = 0; i < bss->supp_rates_len; i++) {
  73                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  74
  75                 for (j = 0; j < sband->n_bitrates; j++)
  76                         if (sband->bitrates[j].bitrate == rate) {
  77                                 *rates |= BIT(j);
  78                                 count++;
  79                                 break;
  80                         }
  81         }
  82
  83         return count;
  84 }
  85
  86 /*
  87  * ieee80211_enable_ht should be called only after the operating band
  88  * has been determined as ht configuration depends on the hw's
  89  * HT abilities for a specific band.
  90  */
  91 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
  92                                struct ieee80211_ht_info *hti,
  93                                u16 ap_ht_cap_flags)
  94 {
  95         struct ieee80211_local *local = sdata->local;
  96         struct ieee80211_supported_band *sband;
  97         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  98         struct sta_info *sta;
  99         u32 changed = 0;
 100         u16 ht_opmode;
 101         bool enable_ht = true, ht_changed;
 102         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 103
 104         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 105
 106         /* HT is not supported */
 107         if (!sband->ht_cap.ht_supported)
 108                 enable_ht = false;
 109
 110         /* check that channel matches the right operating channel */
 111         if (local->hw.conf.channel->center_freq !=
 112             ieee80211_channel_to_frequency(hti->control_chan))
 113                 enable_ht = false;
 114
 115         if (enable_ht) {
 116                 channel_type = NL80211_CHAN_HT20;
 117
 118                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 119                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 120                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 121                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 122                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 123                                 channel_type = NL80211_CHAN_HT40PLUS;
 124                                 break;
 125                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 126                                 channel_type = NL80211_CHAN_HT40MINUS;
 127                                 break;
 128                         }
 129                 }
 130         }
 131
 132         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 133                      channel_type != local->hw.conf.channel_type;
 134
 135         local->oper_channel_type = channel_type;
 136
 137         if (ht_changed) {
 138                 /* channel_type change automatically detected */
 139                 ieee80211_hw_config(local, 0);
 140
 141                 rcu_read_lock();
 142
 143                 sta = sta_info_get(local, ifmgd->bssid);
 144                 if (sta)
 145                         rate_control_rate_update(local, sband, sta,
 146                                                  IEEE80211_RC_HT_CHANGED);
 147
 148                 rcu_read_unlock();
 149         }
 150
 151         /* disable HT */
 152         if (!enable_ht)
 153                 return 0;
 154
 155         ht_opmode = le16_to_cpu(hti->operation_mode);
 156
 157         /* if bss configuration changed store the new one */
 158         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 159                 changed |= BSS_CHANGED_HT;
 160                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 161         }
 162
 163         return changed;
 164 }
 165
 166 /* frame sending functions */
 167
 168 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 169 {
 170         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 171         struct ieee80211_local *local = sdata->local;
 172         struct sk_buff *skb;
 173         struct ieee80211_mgmt *mgmt;
 174         u8 *pos, *ies, *ht_ie;
 175         int i, len, count, rates_len, supp_rates_len;
 176         u16 capab;
 177         struct ieee80211_bss *bss;
 178         int wmm = 0;
 179         struct ieee80211_supported_band *sband;
 180         u32 rates = 0;
 181
 182         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 183                             sizeof(*mgmt) + 200 + ifmgd->extra_ie_len +
 184                             ifmgd->ssid_len);
 185         if (!skb) {
 186                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 187                        "frame\n", sdata->dev->name);
 188                 return;
 189         }
 190         skb_reserve(skb, local->hw.extra_tx_headroom);
 191
 192         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 193
 194         capab = ifmgd->capab;
 195
 196         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 197                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 198                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 199                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 200                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 201         }
 202
 203         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 204                                    local->hw.conf.channel->center_freq,
 205                                    ifmgd->ssid, ifmgd->ssid_len);
 206         if (bss) {
 207                 if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
 208                         capab |= WLAN_CAPABILITY_PRIVACY;
 209                 if (bss->wmm_used)
 210                         wmm = 1;
 211
 212                 /* get all rates supported by the device and the AP as
 213                  * some APs don't like getting a superset of their rates
 214                  * in the association request (e.g. D-Link DAP 1353 in
 215                  * b-only mode) */
 216                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 217
 218                 if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 219                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 220                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 221
 222                 ieee80211_rx_bss_put(local, bss);
 223         } else {
 224                 rates = ~0;
 225                 rates_len = sband->n_bitrates;
 226         }
 227
 228         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 229         memset(mgmt, 0, 24);
 230         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 231         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 232         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 233
 234         if (ifmgd->flags & IEEE80211_STA_PREV_BSSID_SET) {
 235                 skb_put(skb, 10);
 236                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 237                                                   IEEE80211_STYPE_REASSOC_REQ);
 238                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 239                 mgmt->u.reassoc_req.listen_interval =
 240                                 cpu_to_le16(local->hw.conf.listen_interval);
 241                 memcpy(mgmt->u.reassoc_req.current_ap, ifmgd->prev_bssid,
 242                        ETH_ALEN);
 243         } else {
 244                 skb_put(skb, 4);
 245                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 246                                                   IEEE80211_STYPE_ASSOC_REQ);
 247                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 248                 mgmt->u.assoc_req.listen_interval =
 249                                 cpu_to_le16(local->hw.conf.listen_interval);
 250         }
 251
 252         /* SSID */
 253         ies = pos = skb_put(skb, 2 + ifmgd->ssid_len);
 254         *pos++ = WLAN_EID_SSID;
 255         *pos++ = ifmgd->ssid_len;
 256         memcpy(pos, ifmgd->ssid, ifmgd->ssid_len);
 257
 258         /* add all rates which were marked to be used above */
 259         supp_rates_len = rates_len;
 260         if (supp_rates_len > 8)
 261                 supp_rates_len = 8;
 262
 263         len = sband->n_bitrates;
 264         pos = skb_put(skb, supp_rates_len + 2);
 265         *pos++ = WLAN_EID_SUPP_RATES;
 266         *pos++ = supp_rates_len;
 267
 268         count = 0;
 269         for (i = 0; i < sband->n_bitrates; i++) {
 270                 if (BIT(i) & rates) {
 271                         int rate = sband->bitrates[i].bitrate;
 272                         *pos++ = (u8) (rate / 5);
 273                         if (++count == 8)
 274                                 break;
 275                 }
 276         }
 277
 278         if (rates_len > count) {
 279                 pos = skb_put(skb, rates_len - count + 2);
 280                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 281                 *pos++ = rates_len - count;
 282
 283                 for (i++; i < sband->n_bitrates; i++) {
 284                         if (BIT(i) & rates) {
 285                                 int rate = sband->bitrates[i].bitrate;
 286                                 *pos++ = (u8) (rate / 5);
 287                         }
 288                 }
 289         }
 290
 291         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 292                 /* 1. power capabilities */
 293                 pos = skb_put(skb, 4);
 294                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 295                 *pos++ = 2;
 296                 *pos++ = 0; /* min tx power */
 297                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 298
 299                 /* 2. supported channels */
 300                 /* TODO: get this in reg domain format */
 301                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 302                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 303                 *pos++ = 2 * sband->n_channels;
 304                 for (i = 0; i < sband->n_channels; i++) {
 305                         *pos++ = ieee80211_frequency_to_channel(
 306                                         sband->channels[i].center_freq);
 307                         *pos++ = 1; /* one channel in the subband*/
 308                 }
 309         }
 310
 311         if (ifmgd->extra_ie) {
 312                 pos = skb_put(skb, ifmgd->extra_ie_len);
 313                 memcpy(pos, ifmgd->extra_ie, ifmgd->extra_ie_len);
 314         }
 315
 316         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
 317                 pos = skb_put(skb, 9);
 318                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 319                 *pos++ = 7; /* len */
 320                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 321                 *pos++ = 0x50;
 322                 *pos++ = 0xf2;
 323                 *pos++ = 2; /* WME */
 324                 *pos++ = 0; /* WME info */
 325                 *pos++ = 1; /* WME ver */
 326                 *pos++ = 0;
 327         }
 328
 329         /* wmm support is a must to HT */
 330         /*
 331          * IEEE802.11n does not allow TKIP/WEP as pairwise
 332          * ciphers in HT mode. We still associate in non-ht
 333          * mode (11a/b/g) if any one of these ciphers is
 334          * configured as pairwise.
 335          */
 336         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
 337             sband->ht_cap.ht_supported &&
 338             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
 339             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 340             (!(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))) {
 341                 struct ieee80211_ht_info *ht_info =
 342                         (struct ieee80211_ht_info *)(ht_ie + 2);
 343                 u16 cap = sband->ht_cap.cap;
 344                 __le16 tmp;
 345                 u32 flags = local->hw.conf.channel->flags;
 346
 347                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 348                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 349                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 350                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 351                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 352                         }
 353                         break;
 354                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 355                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 356                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 357                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 358                         }
 359                         break;
 360                 }
 361
 362                 tmp = cpu_to_le16(cap);
 363                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 364                 *pos++ = WLAN_EID_HT_CAPABILITY;
 365                 *pos++ = sizeof(struct ieee80211_ht_cap);
 366                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 367                 memcpy(pos, &tmp, sizeof(u16));
 368                 pos += sizeof(u16);
 369                 /* TODO: needs a define here for << 2 */
 370                 *pos++ = sband->ht_cap.ampdu_factor |
 371                          (sband->ht_cap.ampdu_density << 2);
 372                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 373         }
 374
 375         kfree(ifmgd->assocreq_ies);
 376         ifmgd->assocreq_ies_len = (skb->data + skb->len) - ies;
 377         ifmgd->assocreq_ies = kmalloc(ifmgd->assocreq_ies_len, GFP_KERNEL);
 378         if (ifmgd->assocreq_ies)
 379                 memcpy(ifmgd->assocreq_ies, ies, ifmgd->assocreq_ies_len);
 380
 381         ieee80211_tx_skb(sdata, skb, 0);
 382 }
 383
 384
 385 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 386                                            u16 stype, u16 reason)
 387 {
 388         struct ieee80211_local *local = sdata->local;
 389         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 390         struct sk_buff *skb;
 391         struct ieee80211_mgmt *mgmt;
 392
 393         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 394         if (!skb) {
 395                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 396                        "deauth/disassoc frame\n", sdata->dev->name);
 397                 return;
 398         }
 399         skb_reserve(skb, local->hw.extra_tx_headroom);
 400
 401         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 402         memset(mgmt, 0, 24);
 403         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 404         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 405         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 406         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 407         skb_put(skb, 2);
 408         /* u.deauth.reason_code == u.disassoc.reason_code */
 409         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 410
 411         if (stype == IEEE80211_STYPE_DEAUTH)
 412                 cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, skb->len);
 413         else
 414                 cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, skb->len);
 415         ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
 416 }
 417
 418 void ieee80211_send_pspoll(struct ieee80211_local *local,
 419                            struct ieee80211_sub_if_data *sdata)
 420 {
 421         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 422         struct ieee80211_pspoll *pspoll;
 423         struct sk_buff *skb;
 424         u16 fc;
 425
 426         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 427         if (!skb) {
 428                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 429                        "pspoll frame\n", sdata->dev->name);
 430                 return;
 431         }
 432         skb_reserve(skb, local->hw.extra_tx_headroom);
 433
 434         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 435         memset(pspoll, 0, sizeof(*pspoll));
 436         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 437         pspoll->frame_control = cpu_to_le16(fc);
 438         pspoll->aid = cpu_to_le16(ifmgd->aid);
 439
 440         /* aid in PS-Poll has its two MSBs each set to 1 */
 441         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 442
 443         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
 444         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
 445
 446         ieee80211_tx_skb(sdata, skb, 0);
 447 }
 448
 449 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 450                              struct ieee80211_sub_if_data *sdata,
 451                              int powersave)
 452 {
 453         struct sk_buff *skb;
 454         struct ieee80211_hdr *nullfunc;
 455         __le16 fc;
 456
 457         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 458                 return;
 459
 460         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
 461         if (!skb) {
 462                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
 463                        "frame\n", sdata->dev->name);
 464                 return;
 465         }
 466         skb_reserve(skb, local->hw.extra_tx_headroom);
 467
 468         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
 469         memset(nullfunc, 0, 24);
 470         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 471                          IEEE80211_FCTL_TODS);
 472         if (powersave)
 473                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
 474         nullfunc->frame_control = fc;
 475         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 476         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
 477         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 478
 479         ieee80211_tx_skb(sdata, skb, 0);
 480 }
 481
 482 /* powersave */
 483 static void ieee80211_enable_ps(struct ieee80211_local *local,
 484                                 struct ieee80211_sub_if_data *sdata)
 485 {
 486         struct ieee80211_conf *conf = &local->hw.conf;
 487
 488         /*
 489          * If we are scanning right now then the parameters will
 490          * take effect when scan finishes.
 491          */
 492         if (local->hw_scanning || local->sw_scanning)
 493                 return;
 494
 495         if (conf->dynamic_ps_timeout > 0 &&
 496             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 497                 mod_timer(&local->dynamic_ps_timer, jiffies +
 498                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 499         } else {
 500                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 501                         ieee80211_send_nullfunc(local, sdata, 1);
 502                 conf->flags |= IEEE80211_CONF_PS;
 503                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 504         }
 505 }
 506
 507 static void ieee80211_change_ps(struct ieee80211_local *local)
 508 {
 509         struct ieee80211_conf *conf = &local->hw.conf;
 510
 511         if (local->ps_sdata) {
 512                 if (!(local->ps_sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED))
 513                         return;
 514
 515                 ieee80211_enable_ps(local, local->ps_sdata);
 516         } else if (conf->flags & IEEE80211_CONF_PS) {
 517                 conf->flags &= ~IEEE80211_CONF_PS;
 518                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 519                 del_timer_sync(&local->dynamic_ps_timer);
 520                 cancel_work_sync(&local->dynamic_ps_enable_work);
 521         }
 522 }
 523
 524 /* need to hold RTNL or interface lock */
 525 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 526 {
 527         struct ieee80211_sub_if_data *sdata, *found = NULL;
 528         int count = 0;
 529
 530         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 531                 local->ps_sdata = NULL;
 532                 return;
 533         }
 534
 535         list_for_each_entry(sdata, &local->interfaces, list) {
 536                 if (!netif_running(sdata->dev))
 537                         continue;
 538                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 539                         continue;
 540                 found = sdata;
 541                 count++;
 542         }
 543
 544         if (count == 1 && found->u.mgd.powersave) {
 545                 s32 beaconint_us;
 546
 547                 if (latency < 0)
 548                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 549
 550                 beaconint_us = ieee80211_tu_to_usec(
 551                                         found->vif.bss_conf.beacon_int);
 552
 553                 if (beaconint_us > latency) {
 554                         local->ps_sdata = NULL;
 555                 } else {
 556                         u8 dtimper = found->vif.bss_conf.dtim_period;
 557                         int maxslp = 1;
 558
 559                         if (dtimper > 1)
 560                                 maxslp = min_t(int, dtimper,
 561                                                     latency / beaconint_us);
 562
 563                         local->hw.conf.max_sleep_period = maxslp;
 564                         local->ps_sdata = found;
 565                 }
 566         } else {
 567                 local->ps_sdata = NULL;
 568         }
 569
 570         ieee80211_change_ps(local);
 571 }
 572
 573 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 574 {
 575         struct ieee80211_local *local =
 576                 container_of(work, struct ieee80211_local,
 577                              dynamic_ps_disable_work);
 578
 579         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 580                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 581                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 582         }
 583
 584         ieee80211_wake_queues_by_reason(&local->hw,
 585                                         IEEE80211_QUEUE_STOP_REASON_PS);
 586 }
 587
 588 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 589 {
 590         struct ieee80211_local *local =
 591                 container_of(work, struct ieee80211_local,
 592                              dynamic_ps_enable_work);
 593         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 594
 595         /* can only happen when PS was just disabled anyway */
 596         if (!sdata)
 597                 return;
 598
 599         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 600                 return;
 601
 602         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 603                 ieee80211_send_nullfunc(local, sdata, 1);
 604
 605         local->hw.conf.flags |= IEEE80211_CONF_PS;
 606         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 607 }
 608
 609 void ieee80211_dynamic_ps_timer(unsigned long data)
 610 {
 611         struct ieee80211_local *local = (void *) data;
 612
 613         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
 614 }
 615
 616 /* MLME */
 617 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 618                                      struct ieee80211_if_managed *ifmgd,
 619                                      u8 *wmm_param, size_t wmm_param_len)
 620 {
 621         struct ieee80211_tx_queue_params params;
 622         size_t left;
 623         int count;
 624         u8 *pos;
 625
 626         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
 627                 return;
 628
 629         if (!wmm_param)
 630                 return;
 631
 632         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 633                 return;
 634         count = wmm_param[6] & 0x0f;
 635         if (count == ifmgd->wmm_last_param_set)
 636                 return;
 637         ifmgd->wmm_last_param_set = count;
 638
 639         pos = wmm_param + 8;
 640         left = wmm_param_len - 8;
 641
 642         memset(&params, 0, sizeof(params));
 643
 644         local->wmm_acm = 0;
 645         for (; left >= 4; left -= 4, pos += 4) {
 646                 int aci = (pos[0] >> 5) & 0x03;
 647                 int acm = (pos[0] >> 4) & 0x01;
 648                 int queue;
 649
 650                 switch (aci) {
 651                 case 1: /* AC_BK */
 652                         queue = 3;
 653                         if (acm)
 654                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 655                         break;
 656                 case 2: /* AC_VI */
 657                         queue = 1;
 658                         if (acm)
 659                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 660                         break;
 661                 case 3: /* AC_VO */
 662                         queue = 0;
 663                         if (acm)
 664                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 665                         break;
 666                 case 0: /* AC_BE */
 667                 default:
 668                         queue = 2;
 669                         if (acm)
 670                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 671                         break;
 672                 }
 673
 674                 params.aifs = pos[0] & 0x0f;
 675                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 676                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 677                 params.txop = get_unaligned_le16(pos + 2);
 678 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 679                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 680                        "cWmin=%d cWmax=%d txop=%d\n",
 681                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 682                        params.cw_max, params.txop);
 683 #endif
 684                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
 685                         printk(KERN_DEBUG "%s: failed to set TX queue "
 686                                "parameters for queue %d\n", local->mdev->name,
 687                                queue);
 688         }
 689 }
 690
 691 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 692                                            u16 capab, bool erp_valid, u8 erp)
 693 {
 694         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 695 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 696         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 697 #endif
 698         u32 changed = 0;
 699         bool use_protection;
 700         bool use_short_preamble;
 701         bool use_short_slot;
 702
 703         if (erp_valid) {
 704                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 705                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 706         } else {
 707                 use_protection = false;
 708                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 709         }
 710
 711         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 712
 713         if (use_protection != bss_conf->use_cts_prot) {
 714 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 715                 if (net_ratelimit()) {
 716                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 717                                sdata->dev->name,
 718                                use_protection ? "enabled" : "disabled",
 719                                ifmgd->bssid);
 720                 }
 721 #endif
 722                 bss_conf->use_cts_prot = use_protection;
 723                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 724         }
 725
 726         if (use_short_preamble != bss_conf->use_short_preamble) {
 727 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 728                 if (net_ratelimit()) {
 729                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 730                                " (BSSID=%pM)\n",
 731                                sdata->dev->name,
 732                                use_short_preamble ? "short" : "long",
 733                                ifmgd->bssid);
 734                 }
 735 #endif
 736                 bss_conf->use_short_preamble = use_short_preamble;
 737                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 738         }
 739
 740         if (use_short_slot != bss_conf->use_short_slot) {
 741 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 742                 if (net_ratelimit()) {
 743                         printk(KERN_DEBUG "%s: switched to %s slot time"
 744                                " (BSSID=%pM)\n",
 745                                sdata->dev->name,
 746                                use_short_slot ? "short" : "long",
 747                                ifmgd->bssid);
 748                 }
 749 #endif
 750                 bss_conf->use_short_slot = use_short_slot;
 751                 changed |= BSS_CHANGED_ERP_SLOT;
 752         }
 753
 754         return changed;
 755 }
 756
 757 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata)
 758 {
 759         union iwreq_data wrqu;
 760
 761         memset(&wrqu, 0, sizeof(wrqu));
 762         if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED)
 763                 memcpy(wrqu.ap_addr.sa_data, sdata->u.mgd.bssid, ETH_ALEN);
 764         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 765         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 766 }
 767
 768 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata)
 769 {
 770         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 771         char *buf;
 772         size_t len;
 773         int i;
 774         union iwreq_data wrqu;
 775
 776         if (!ifmgd->assocreq_ies && !ifmgd->assocresp_ies)
 777                 return;
 778
 779         buf = kmalloc(50 + 2 * (ifmgd->assocreq_ies_len +
 780                                 ifmgd->assocresp_ies_len), GFP_KERNEL);
 781         if (!buf)
 782                 return;
 783
 784         len = sprintf(buf, "ASSOCINFO(");
 785         if (ifmgd->assocreq_ies) {
 786                 len += sprintf(buf + len, "ReqIEs=");
 787                 for (i = 0; i < ifmgd->assocreq_ies_len; i++) {
 788                         len += sprintf(buf + len, "%02x",
 789                                        ifmgd->assocreq_ies[i]);
 790                 }
 791         }
 792         if (ifmgd->assocresp_ies) {
 793                 if (ifmgd->assocreq_ies)
 794                         len += sprintf(buf + len, " ");
 795                 len += sprintf(buf + len, "RespIEs=");
 796                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 797                         len += sprintf(buf + len, "%02x",
 798                                        ifmgd->assocresp_ies[i]);
 799                 }
 800         }
 801         len += sprintf(buf + len, ")");
 802
 803         if (len > IW_CUSTOM_MAX) {
 804                 len = sprintf(buf, "ASSOCRESPIE=");
 805                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 806                         len += sprintf(buf + len, "%02x",
 807                                        ifmgd->assocresp_ies[i]);
 808                 }
 809         }
 810
 811         if (len <= IW_CUSTOM_MAX) {
 812                 memset(&wrqu, 0, sizeof(wrqu));
 813                 wrqu.data.length = len;
 814                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 815         }
 816
 817         kfree(buf);
 818 }
 819
 820
 821 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 822                                      u32 bss_info_changed)
 823 {
 824         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 825         struct ieee80211_local *local = sdata->local;
 826         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 827
 828         struct ieee80211_bss *bss;
 829
 830         bss_info_changed |= BSS_CHANGED_ASSOC;
 831         ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
 832
 833         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 834                                    conf->channel->center_freq,
 835                                    ifmgd->ssid, ifmgd->ssid_len);
 836         if (bss) {
 837                 /* set timing information */
 838                 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 839                 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 840                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 841
 842                 bss_info_changed |= BSS_CHANGED_BEACON_INT;
 843                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 844                         bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 845
 846                 cfg80211_hold_bss(&bss->cbss);
 847
 848                 ieee80211_rx_bss_put(local, bss);
 849         }
 850
 851         ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
 852         memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
 853         ieee80211_sta_send_associnfo(sdata);
 854
 855         ifmgd->last_probe = jiffies;
 856         ieee80211_led_assoc(local, 1);
 857
 858         sdata->vif.bss_conf.assoc = 1;
 859         /*
 860          * For now just always ask the driver to update the basic rateset
 861          * when we have associated, we aren't checking whether it actually
 862          * changed or not.
 863          */
 864         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 865         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 866
 867         /* will be same as sdata */
 868         if (local->ps_sdata) {
 869                 mutex_lock(&local->iflist_mtx);
 870                 ieee80211_recalc_ps(local, -1);
 871                 mutex_unlock(&local->iflist_mtx);
 872         }
 873
 874         netif_tx_start_all_queues(sdata->dev);
 875         netif_carrier_on(sdata->dev);
 876
 877         ieee80211_sta_send_apinfo(sdata);
 878 }
 879
 880 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
 881 {
 882         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 883         struct ieee80211_local *local = sdata->local;
 884
 885         ifmgd->direct_probe_tries++;
 886         if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 887                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 888                        sdata->dev->name, ifmgd->bssid);
 889                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 890                 ieee80211_recalc_idle(local);
 891                 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid);
 892
 893                 /*
 894                  * Most likely AP is not in the range so remove the
 895                  * bss information associated to the AP
 896                  */
 897                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 898                                 sdata->local->hw.conf.channel->center_freq,
 899                                 ifmgd->ssid, ifmgd->ssid_len);
 900
 901                 /*
 902                  * We might have a pending scan which had no chance to run yet
 903                  * due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
 904                  * Hence, queue the STAs work again
 905                  */
 906                 queue_work(local->hw.workqueue, &ifmgd->work);
 907                 return;
 908         }
 909
 910         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 911                         sdata->dev->name, ifmgd->bssid,
 912                         ifmgd->direct_probe_tries);
 913
 914         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 915
 916         /* Direct probe is sent to broadcast address as some APs
 917          * will not answer to direct packet in unassociated state.
 918          */
 919         ieee80211_send_probe_req(sdata, NULL,
 920                                  ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
 921
 922         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 923 }
 924
 925
 926 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
 927 {
 928         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 929         struct ieee80211_local *local = sdata->local;
 930         u8 *ies;
 931         size_t ies_len;
 932
 933         ifmgd->auth_tries++;
 934         if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 935                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 936                        " timed out\n",
 937                        sdata->dev->name, ifmgd->bssid);
 938                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 939                 ieee80211_recalc_idle(local);
 940                 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid);
 941                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 942                                 sdata->local->hw.conf.channel->center_freq,
 943                                 ifmgd->ssid, ifmgd->ssid_len);
 944
 945                 /*
 946                  * We might have a pending scan which had no chance to run yet
 947                  * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
 948                  * Hence, queue the STAs work again
 949                  */
 950                 queue_work(local->hw.workqueue, &ifmgd->work);
 951                 return;
 952         }
 953
 954         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
 955         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 956                sdata->dev->name, ifmgd->bssid);
 957
 958         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
 959                 ies = ifmgd->sme_auth_ie;
 960                 ies_len = ifmgd->sme_auth_ie_len;
 961         } else {
 962                 ies = NULL;
 963                 ies_len = 0;
 964         }
 965         ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len,
 966                             ifmgd->bssid, 0);
 967         ifmgd->auth_transaction = 2;
 968
 969         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 970 }
 971
 972 /*
 973  * The disassoc 'reason' argument can be either our own reason
 974  * if self disconnected or a reason code from the AP.
 975  */
 976 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 977                                    bool deauth, bool self_disconnected,
 978                                    u16 reason)
 979 {
 980         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 981         struct ieee80211_local *local = sdata->local;
 982         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 983         struct ieee80211_bss *bss;
 984         struct sta_info *sta;
 985         u32 changed = 0, config_changed = 0;
 986
 987         rcu_read_lock();
 988
 989         sta = sta_info_get(local, ifmgd->bssid);
 990         if (!sta) {
 991                 rcu_read_unlock();
 992                 return;
 993         }
 994
 995         if (deauth) {
 996                 ifmgd->direct_probe_tries = 0;
 997                 ifmgd->auth_tries = 0;
 998         }
 999         ifmgd->assoc_scan_tries = 0;
1000         ifmgd->assoc_tries = 0;
1001
1002         netif_tx_stop_all_queues(sdata->dev);
1003         netif_carrier_off(sdata->dev);
1004
1005         ieee80211_sta_tear_down_BA_sessions(sta);
1006
1007         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1008                                    conf->channel->center_freq,
1009                                    ifmgd->ssid, ifmgd->ssid_len);
1010
1011         if (bss) {
1012                 cfg80211_unhold_bss(&bss->cbss);
1013                 ieee80211_rx_bss_put(local, bss);
1014         }
1015
1016         if (self_disconnected) {
1017                 if (deauth)
1018                         ieee80211_send_deauth_disassoc(sdata,
1019                                 IEEE80211_STYPE_DEAUTH, reason);
1020                 else
1021                         ieee80211_send_deauth_disassoc(sdata,
1022                                 IEEE80211_STYPE_DISASSOC, reason);
1023         }
1024
1025         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1026         changed |= ieee80211_reset_erp_info(sdata);
1027
1028         ieee80211_led_assoc(local, 0);
1029         changed |= BSS_CHANGED_ASSOC;
1030         sdata->vif.bss_conf.assoc = false;
1031
1032         ieee80211_sta_send_apinfo(sdata);
1033
1034         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
1035                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1036                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1037                                 sdata->local->hw.conf.channel->center_freq,
1038                                 ifmgd->ssid, ifmgd->ssid_len);
1039         }
1040
1041         rcu_read_unlock();
1042
1043         ieee80211_set_wmm_default(sdata);
1044
1045         ieee80211_recalc_idle(local);
1046
1047         /* channel(_type) changes are handled by ieee80211_hw_config */
1048         local->oper_channel_type = NL80211_CHAN_NO_HT;
1049
1050         local->power_constr_level = 0;
1051
1052         del_timer_sync(&local->dynamic_ps_timer);
1053         cancel_work_sync(&local->dynamic_ps_enable_work);
1054
1055         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1056                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1057                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1058         }
1059
1060         ieee80211_hw_config(local, config_changed);
1061         ieee80211_bss_info_change_notify(sdata, changed);
1062
1063         rcu_read_lock();
1064
1065         sta = sta_info_get(local, ifmgd->bssid);
1066         if (!sta) {
1067                 rcu_read_unlock();
1068                 return;
1069         }
1070
1071         sta_info_unlink(&sta);
1072
1073         rcu_read_unlock();
1074
1075         sta_info_destroy(sta);
1076 }
1077
1078 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1079 {
1080         if (!sdata || !sdata->default_key ||
1081             sdata->default_key->conf.alg != ALG_WEP)
1082                 return 0;
1083         return 1;
1084 }
1085
1086 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
1087 {
1088         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1089         struct ieee80211_local *local = sdata->local;
1090         struct ieee80211_bss *bss;
1091         int bss_privacy;
1092         int wep_privacy;
1093         int privacy_invoked;
1094
1095         if (!ifmgd || (ifmgd->flags & IEEE80211_STA_EXT_SME))
1096                 return 0;
1097
1098         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1099                                    local->hw.conf.channel->center_freq,
1100                                    ifmgd->ssid, ifmgd->ssid_len);
1101         if (!bss)
1102                 return 0;
1103
1104         bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
1105         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1106         privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
1107
1108         ieee80211_rx_bss_put(local, bss);
1109
1110         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1111                 return 0;
1112
1113         return 1;
1114 }
1115
1116 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
1117 {
1118         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1119         struct ieee80211_local *local = sdata->local;
1120
1121         ifmgd->assoc_tries++;
1122         if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1123                 printk(KERN_DEBUG "%s: association with AP %pM"
1124                        " timed out\n",
1125                        sdata->dev->name, ifmgd->bssid);
1126                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1127                 ieee80211_recalc_idle(local);
1128                 cfg80211_send_assoc_timeout(sdata->dev, ifmgd->bssid);
1129                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1130                                 sdata->local->hw.conf.channel->center_freq,
1131                                 ifmgd->ssid, ifmgd->ssid_len);
1132                 /*
1133                  * We might have a pending scan which had no chance to run yet
1134                  * due to state == IEEE80211_STA_MLME_ASSOCIATE.
1135                  * Hence, queue the STAs work again
1136                  */
1137                 queue_work(local->hw.workqueue, &ifmgd->work);
1138                 return;
1139         }
1140
1141         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1142         printk(KERN_DEBUG "%s: associate with AP %pM\n",
1143                sdata->dev->name, ifmgd->bssid);
1144         if (ieee80211_privacy_mismatch(sdata)) {
1145                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1146                        "mixed-cell disabled - abort association\n", sdata->dev->name);
1147                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1148                 ieee80211_recalc_idle(local);
1149                 return;
1150         }
1151
1152         ieee80211_send_assoc(sdata);
1153
1154         mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1155 }
1156
1157 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1158                              struct ieee80211_hdr *hdr)
1159 {
1160         /*
1161          * We can postpone the mgd.timer whenever receiving unicast frames
1162          * from AP because we know that the connection is working both ways
1163          * at that time. But multicast frames (and hence also beacons) must
1164          * be ignored here, because we need to trigger the timer during
1165          * data idle periods for sending the periodical probe request to
1166          * the AP.
1167          */
1168         if (!is_multicast_ether_addr(hdr->addr1))
1169                 mod_timer(&sdata->u.mgd.timer,
1170                           jiffies + IEEE80211_MONITORING_INTERVAL);
1171 }
1172
1173 void ieee80211_beacon_loss_work(struct work_struct *work)
1174 {
1175         struct ieee80211_sub_if_data *sdata =
1176                 container_of(work, struct ieee80211_sub_if_data,
1177                              u.mgd.beacon_loss_work);
1178         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1179
1180 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1181         if (net_ratelimit()) {
1182                 printk(KERN_DEBUG "%s: driver reports beacon loss from AP %pM "
1183                        "- sending probe request\n", sdata->dev->name,
1184                        sdata->u.mgd.bssid);
1185         }
1186 #endif
1187
1188         ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1189         ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1190                                  ifmgd->ssid_len, NULL, 0);
1191
1192         mod_timer(&ifmgd->timer, jiffies + IEEE80211_MONITORING_INTERVAL);
1193 }
1194
1195 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1196 {
1197         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1198
1199         queue_work(sdata->local->hw.workqueue,
1200                    &sdata->u.mgd.beacon_loss_work);
1201 }
1202 EXPORT_SYMBOL(ieee80211_beacon_loss);
1203
1204 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
1205 {
1206         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1207         struct ieee80211_local *local = sdata->local;
1208         struct sta_info *sta;
1209         bool disassoc = false;
1210
1211         /* TODO: start monitoring current AP signal quality and number of
1212          * missed beacons. Scan other channels every now and then and search
1213          * for better APs. */
1214         /* TODO: remove expired BSSes */
1215
1216         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
1217
1218         rcu_read_lock();
1219
1220         sta = sta_info_get(local, ifmgd->bssid);
1221         if (!sta) {
1222                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1223                        sdata->dev->name, ifmgd->bssid);
1224                 disassoc = true;
1225                 goto unlock;
1226         }
1227
1228         if ((ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) &&
1229             time_after(jiffies, sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1230                 printk(KERN_DEBUG "%s: no probe response from AP %pM "
1231                        "- disassociating\n",
1232                        sdata->dev->name, ifmgd->bssid);
1233                 disassoc = true;
1234                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1235                 goto unlock;
1236         }
1237
1238         /*
1239          * Beacon filtering is only enabled with power save and then the
1240          * stack should not check for beacon loss.
1241          */
1242         if (!((local->hw.flags & IEEE80211_HW_BEACON_FILTER) &&
1243               (local->hw.conf.flags & IEEE80211_CONF_PS)) &&
1244             time_after(jiffies,
1245                        ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) {
1246 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1247                 if (net_ratelimit()) {
1248                         printk(KERN_DEBUG "%s: beacon loss from AP %pM "
1249                                "- sending probe request\n",
1250                                sdata->dev->name, ifmgd->bssid);
1251                 }
1252 #endif
1253                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1254                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1255                                          ifmgd->ssid_len, NULL, 0);
1256                 goto unlock;
1257
1258         }
1259
1260         if (time_after(jiffies, sta->last_rx + IEEE80211_PROBE_IDLE_TIME)) {
1261                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1262                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1263                                          ifmgd->ssid_len, NULL, 0);
1264         }
1265
1266  unlock:
1267         rcu_read_unlock();
1268
1269         if (disassoc)
1270                 ieee80211_set_disassoc(sdata, true, true,
1271                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1272         else
1273                 mod_timer(&ifmgd->timer, jiffies +
1274                                       IEEE80211_MONITORING_INTERVAL);
1275 }
1276
1277
1278 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
1279 {
1280         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1281
1282         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1283         ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
1284         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1285                 /* Wait for SME to request association */
1286                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1287                 ieee80211_recalc_idle(sdata->local);
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                         ieee80211_recalc_idle(local);
1525                 }
1526                 return;
1527         }
1528
1529         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1530                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1531                        "set\n", sdata->dev->name, aid);
1532         aid &= ~(BIT(15) | BIT(14));
1533
1534         if (!elems.supp_rates) {
1535                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1536                        sdata->dev->name);
1537                 return;
1538         }
1539
1540         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1541         ifmgd->aid = aid;
1542         ifmgd->ap_capab = capab_info;
1543
1544         kfree(ifmgd->assocresp_ies);
1545         ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1546         ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1547         if (ifmgd->assocresp_ies)
1548                 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1549
1550         rcu_read_lock();
1551
1552         /* Add STA entry for the AP */
1553         sta = sta_info_get(local, ifmgd->bssid);
1554         if (!sta) {
1555                 newsta = true;
1556
1557                 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1558                 if (!sta) {
1559                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1560                                " the AP\n", sdata->dev->name);
1561                         rcu_read_unlock();
1562                         return;
1563                 }
1564
1565                 /* update new sta with its last rx activity */
1566                 sta->last_rx = jiffies;
1567         }
1568
1569         /*
1570          * FIXME: Do we really need to update the sta_info's information here?
1571          *        We already know about the AP (we found it in our list) so it
1572          *        should already be filled with the right info, no?
1573          *        As is stands, all this is racy because typically we assume
1574          *        the information that is filled in here (except flags) doesn't
1575          *        change while a STA structure is alive. As such, it should move
1576          *        to between the sta_info_alloc() and sta_info_insert() above.
1577          */
1578
1579         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1580                            WLAN_STA_AUTHORIZED);
1581
1582         rates = 0;
1583         basic_rates = 0;
1584         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1585
1586         for (i = 0; i < elems.supp_rates_len; i++) {
1587                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1588                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1589
1590                 if (rate > 110)
1591                         have_higher_than_11mbit = true;
1592
1593                 for (j = 0; j < sband->n_bitrates; j++) {
1594                         if (sband->bitrates[j].bitrate == rate) {
1595                                 rates |= BIT(j);
1596                                 if (is_basic)
1597                                         basic_rates |= BIT(j);
1598                                 break;
1599                         }
1600                 }
1601         }
1602
1603         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1604                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1605                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1606
1607                 if (rate > 110)
1608                         have_higher_than_11mbit = true;
1609
1610                 for (j = 0; j < sband->n_bitrates; j++) {
1611                         if (sband->bitrates[j].bitrate == rate) {
1612                                 rates |= BIT(j);
1613                                 if (is_basic)
1614                                         basic_rates |= BIT(j);
1615                                 break;
1616                         }
1617                 }
1618         }
1619
1620         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1621         sdata->vif.bss_conf.basic_rates = basic_rates;
1622
1623         /* cf. IEEE 802.11 9.2.12 */
1624         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1625             have_higher_than_11mbit)
1626                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1627         else
1628                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1629
1630         /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1631         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1632                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1633                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1634
1635         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1636
1637         rate_control_rate_init(sta);
1638
1639         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1640                 set_sta_flags(sta, WLAN_STA_MFP);
1641
1642         if (elems.wmm_param)
1643                 set_sta_flags(sta, WLAN_STA_WME);
1644
1645         if (newsta) {
1646                 int err = sta_info_insert(sta);
1647                 if (err) {
1648                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1649                                " the AP (error %d)\n", sdata->dev->name, err);
1650                         rcu_read_unlock();
1651                         return;
1652                 }
1653         }
1654
1655         rcu_read_unlock();
1656
1657         if (elems.wmm_param)
1658                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1659                                          elems.wmm_param_len);
1660         else
1661                 ieee80211_set_wmm_default(sdata);
1662
1663         if (elems.ht_info_elem && elems.wmm_param &&
1664             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1665             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1666                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1667                                                ap_ht_cap_flags);
1668
1669         /* set AID and assoc capability,
1670          * ieee80211_set_associated() will tell the driver */
1671         bss_conf->aid = aid;
1672         bss_conf->assoc_capability = capab_info;
1673         ieee80211_set_associated(sdata, changed);
1674
1675         /*
1676          * initialise the time of last beacon to be the association time,
1677          * otherwise beacon loss check will trigger immediately
1678          */
1679         ifmgd->last_beacon = jiffies;
1680
1681         ieee80211_associated(sdata);
1682         cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1683 }
1684
1685
1686 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1687                                   struct ieee80211_mgmt *mgmt,
1688                                   size_t len,
1689                                   struct ieee80211_rx_status *rx_status,
1690                                   struct ieee802_11_elems *elems,
1691                                   bool beacon)
1692 {
1693         struct ieee80211_local *local = sdata->local;
1694         int freq;
1695         struct ieee80211_bss *bss;
1696         struct ieee80211_channel *channel;
1697
1698         if (elems->ds_params && elems->ds_params_len == 1)
1699                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1700         else
1701                 freq = rx_status->freq;
1702
1703         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1704
1705         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1706                 return;
1707
1708         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1709                                         channel, beacon);
1710         if (!bss)
1711                 return;
1712
1713         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1714             (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1715                 struct ieee80211_channel_sw_ie *sw_elem =
1716                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1717                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1718         }
1719
1720         ieee80211_rx_bss_put(local, bss);
1721 }
1722
1723
1724 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1725                                          struct ieee80211_mgmt *mgmt,
1726                                          size_t len,
1727                                          struct ieee80211_rx_status *rx_status)
1728 {
1729         struct ieee80211_if_managed *ifmgd;
1730         size_t baselen;
1731         struct ieee802_11_elems elems;
1732
1733         ifmgd = &sdata->u.mgd;
1734
1735         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1736                 return; /* ignore ProbeResp to foreign address */
1737
1738         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1739         if (baselen > len)
1740                 return;
1741
1742         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1743                                 &elems);
1744
1745         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1746
1747         /* direct probe may be part of the association flow */
1748         if (ifmgd->state == IEEE80211_STA_MLME_DIRECT_PROBE) {
1749                 printk(KERN_DEBUG "%s direct probe responded\n",
1750                        sdata->dev->name);
1751                 ieee80211_authenticate(sdata);
1752         }
1753
1754         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1755                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1756 }
1757
1758 /*
1759  * This is the canonical list of information elements we care about,
1760  * the filter code also gives us all changes to the Microsoft OUI
1761  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1762  *
1763  * We implement beacon filtering in software since that means we can
1764  * avoid processing the frame here and in cfg80211, and userspace
1765  * will not be able to tell whether the hardware supports it or not.
1766  *
1767  * XXX: This list needs to be dynamic -- userspace needs to be able to
1768  *      add items it requires. It also needs to be able to tell us to
1769  *      look out for other vendor IEs.
1770  */
1771 static const u64 care_about_ies =
1772         (1ULL << WLAN_EID_COUNTRY) |
1773         (1ULL << WLAN_EID_ERP_INFO) |
1774         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1775         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1776         (1ULL << WLAN_EID_HT_CAPABILITY) |
1777         (1ULL << WLAN_EID_HT_INFORMATION);
1778
1779 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1780                                      struct ieee80211_mgmt *mgmt,
1781                                      size_t len,
1782                                      struct ieee80211_rx_status *rx_status)
1783 {
1784         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1785         size_t baselen;
1786         struct ieee802_11_elems elems;
1787         struct ieee80211_local *local = sdata->local;
1788         u32 changed = 0;
1789         bool erp_valid, directed_tim = false;
1790         u8 erp_value = 0;
1791         u32 ncrc;
1792
1793         /* Process beacon from the current BSS */
1794         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1795         if (baselen > len)
1796                 return;
1797
1798         if (rx_status->freq != local->hw.conf.channel->center_freq)
1799                 return;
1800
1801         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1802             memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1803                 return;
1804
1805         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1806         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1807                                           len - baselen, &elems,
1808                                           care_about_ies, ncrc);
1809
1810         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1811                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1812                                                    ifmgd->aid);
1813
1814         ncrc = crc32_be(ncrc, (void *)&directed_tim, sizeof(directed_tim));
1815
1816         if (ncrc == ifmgd->beacon_crc)
1817                 return;
1818         ifmgd->beacon_crc = ncrc;
1819
1820         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1821
1822         ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1823                                  elems.wmm_param_len);
1824
1825         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1826                 if (directed_tim) {
1827                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1828                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1829                                 ieee80211_hw_config(local,
1830                                                     IEEE80211_CONF_CHANGE_PS);
1831                                 ieee80211_send_nullfunc(local, sdata, 0);
1832                         } else {
1833                                 local->pspolling = true;
1834
1835                                 /*
1836                                  * Here is assumed that the driver will be
1837                                  * able to send ps-poll frame and receive a
1838                                  * response even though power save mode is
1839                                  * enabled, but some drivers might require
1840                                  * to disable power save here. This needs
1841                                  * to be investigated.
1842                                  */
1843                                 ieee80211_send_pspoll(local, sdata);
1844                         }
1845                 }
1846         }
1847
1848         if (elems.erp_info && elems.erp_info_len >= 1) {
1849                 erp_valid = true;
1850                 erp_value = elems.erp_info[0];
1851         } else {
1852                 erp_valid = false;
1853         }
1854         changed |= ieee80211_handle_bss_capability(sdata,
1855                         le16_to_cpu(mgmt->u.beacon.capab_info),
1856                         erp_valid, erp_value);
1857
1858
1859         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1860             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
1861                 struct sta_info *sta;
1862                 struct ieee80211_supported_band *sband;
1863                 u16 ap_ht_cap_flags;
1864
1865                 rcu_read_lock();
1866
1867                 sta = sta_info_get(local, ifmgd->bssid);
1868                 if (!sta) {
1869                         rcu_read_unlock();
1870                         return;
1871                 }
1872
1873                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1874
1875                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1876                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1877
1878                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1879
1880                 rcu_read_unlock();
1881
1882                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1883                                                ap_ht_cap_flags);
1884         }
1885
1886         if (elems.country_elem) {
1887                 /* Note we are only reviewing this on beacons
1888                  * for the BSSID we are associated to */
1889                 regulatory_hint_11d(local->hw.wiphy,
1890                         elems.country_elem, elems.country_elem_len);
1891
1892                 /* TODO: IBSS also needs this */
1893                 if (elems.pwr_constr_elem)
1894                         ieee80211_handle_pwr_constr(sdata,
1895                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1896                                 elems.pwr_constr_elem,
1897                                 elems.pwr_constr_elem_len);
1898         }
1899
1900         ieee80211_bss_info_change_notify(sdata, changed);
1901 }
1902
1903 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1904                                           struct sk_buff *skb,
1905                                           struct ieee80211_rx_status *rx_status)
1906 {
1907         struct ieee80211_local *local = sdata->local;
1908         struct ieee80211_mgmt *mgmt;
1909         u16 fc;
1910
1911         if (skb->len < 24)
1912                 return RX_DROP_MONITOR;
1913
1914         mgmt = (struct ieee80211_mgmt *) skb->data;
1915         fc = le16_to_cpu(mgmt->frame_control);
1916
1917         switch (fc & IEEE80211_FCTL_STYPE) {
1918         case IEEE80211_STYPE_PROBE_REQ:
1919         case IEEE80211_STYPE_PROBE_RESP:
1920         case IEEE80211_STYPE_BEACON:
1921                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1922         case IEEE80211_STYPE_AUTH:
1923         case IEEE80211_STYPE_ASSOC_RESP:
1924         case IEEE80211_STYPE_REASSOC_RESP:
1925         case IEEE80211_STYPE_DEAUTH:
1926         case IEEE80211_STYPE_DISASSOC:
1927                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1928                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1929                 return RX_QUEUED;
1930         }
1931
1932         return RX_DROP_MONITOR;
1933 }
1934
1935 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1936                                          struct sk_buff *skb)
1937 {
1938         struct ieee80211_rx_status *rx_status;
1939         struct ieee80211_mgmt *mgmt;
1940         u16 fc;
1941
1942         rx_status = (struct ieee80211_rx_status *) skb->cb;
1943         mgmt = (struct ieee80211_mgmt *) skb->data;
1944         fc = le16_to_cpu(mgmt->frame_control);
1945
1946         switch (fc & IEEE80211_FCTL_STYPE) {
1947         case IEEE80211_STYPE_PROBE_RESP:
1948                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
1949                                              rx_status);
1950                 break;
1951         case IEEE80211_STYPE_BEACON:
1952                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1953                                          rx_status);
1954                 break;
1955         case IEEE80211_STYPE_AUTH:
1956                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
1957                 break;
1958         case IEEE80211_STYPE_ASSOC_RESP:
1959                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
1960                 break;
1961         case IEEE80211_STYPE_REASSOC_RESP:
1962                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
1963                 break;
1964         case IEEE80211_STYPE_DEAUTH:
1965                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1966                 break;
1967         case IEEE80211_STYPE_DISASSOC:
1968                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1969                 break;
1970         }
1971
1972         kfree_skb(skb);
1973 }
1974
1975 static void ieee80211_sta_timer(unsigned long data)
1976 {
1977         struct ieee80211_sub_if_data *sdata =
1978                 (struct ieee80211_sub_if_data *) data;
1979         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1980         struct ieee80211_local *local = sdata->local;
1981
1982         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1983         queue_work(local->hw.workqueue, &ifmgd->work);
1984 }
1985
1986 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
1987 {
1988         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1989         struct ieee80211_local *local = sdata->local;
1990
1991         /* Reset own TSF to allow time synchronization work. */
1992         drv_reset_tsf(local);
1993
1994         ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
1995
1996
1997         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1998                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1999         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2000                 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
2001         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2002                 ifmgd->auth_alg = WLAN_AUTH_LEAP;
2003         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT)
2004                 ifmgd->auth_alg = WLAN_AUTH_FT;
2005         else
2006                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
2007         ifmgd->auth_transaction = -1;
2008         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
2009         ifmgd->assoc_scan_tries = 0;
2010         ifmgd->direct_probe_tries = 0;
2011         ifmgd->auth_tries = 0;
2012         ifmgd->assoc_tries = 0;
2013         netif_tx_stop_all_queues(sdata->dev);
2014         netif_carrier_off(sdata->dev);
2015 }
2016
2017 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
2018 {
2019         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2020         struct ieee80211_local *local = sdata->local;
2021         struct ieee80211_bss *bss;
2022         u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
2023         u8 ssid_len = ifmgd->ssid_len;
2024         u16 capa_mask = WLAN_CAPABILITY_ESS;
2025         u16 capa_val = WLAN_CAPABILITY_ESS;
2026         struct ieee80211_channel *chan = local->oper_channel;
2027
2028         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
2029             ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2030                             IEEE80211_STA_AUTO_BSSID_SEL |
2031                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
2032                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
2033                 if (sdata->default_key)
2034                         capa_val |= WLAN_CAPABILITY_PRIVACY;
2035         }
2036
2037         if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2038                 chan = NULL;
2039
2040         if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2041                 bssid = NULL;
2042
2043         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
2044                 ssid = NULL;
2045                 ssid_len = 0;
2046         }
2047
2048         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
2049                                        bssid, ssid, ssid_len,
2050                                        capa_mask, capa_val);
2051
2052         if (bss) {
2053                 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
2054                 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
2055                         ieee80211_sta_set_ssid(sdata, bss->ssid,
2056                                                bss->ssid_len);
2057                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
2058                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
2059                                                     bss->supp_rates);
2060                 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
2061                         sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
2062                 else
2063                         sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
2064
2065                 /* Send out direct probe if no probe resp was received or
2066                  * the one we have is outdated
2067                  */
2068                 if (!bss->last_probe_resp ||
2069                     time_after(jiffies, bss->last_probe_resp
2070                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2071                         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2072                 else
2073                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2074
2075                 ieee80211_rx_bss_put(local, bss);
2076                 ieee80211_sta_reset_auth(sdata);
2077                 return 0;
2078         } else {
2079                 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2080
2081                         ifmgd->assoc_scan_tries++;
2082
2083                         ieee80211_request_internal_scan(sdata, ifmgd->ssid,
2084                                                         ssid_len);
2085
2086                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2087                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2088                 } else {
2089                         ifmgd->assoc_scan_tries = 0;
2090                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
2091                         ieee80211_recalc_idle(local);
2092                 }
2093         }
2094         return -1;
2095 }
2096
2097
2098 static void ieee80211_sta_work(struct work_struct *work)
2099 {
2100         struct ieee80211_sub_if_data *sdata =
2101                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2102         struct ieee80211_local *local = sdata->local;
2103         struct ieee80211_if_managed *ifmgd;
2104         struct sk_buff *skb;
2105
2106         if (!netif_running(sdata->dev))
2107                 return;
2108
2109         if (local->sw_scanning || local->hw_scanning)
2110                 return;
2111
2112         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2113                 return;
2114         ifmgd = &sdata->u.mgd;
2115
2116         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2117                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2118
2119         if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2120             ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2121             ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
2122             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
2123                 queue_delayed_work(local->hw.workqueue, &local->scan_work,
2124                                    round_jiffies_relative(0));
2125                 return;
2126         }
2127
2128         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
2129                 if (ieee80211_sta_config_auth(sdata))
2130                         return;
2131                 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2132         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
2133                 return;
2134
2135         ieee80211_recalc_idle(local);
2136
2137         switch (ifmgd->state) {
2138         case IEEE80211_STA_MLME_DISABLED:
2139                 break;
2140         case IEEE80211_STA_MLME_DIRECT_PROBE:
2141                 ieee80211_direct_probe(sdata);
2142                 break;
2143         case IEEE80211_STA_MLME_AUTHENTICATE:
2144                 ieee80211_authenticate(sdata);
2145                 break;
2146         case IEEE80211_STA_MLME_ASSOCIATE:
2147                 ieee80211_associate(sdata);
2148                 break;
2149         case IEEE80211_STA_MLME_ASSOCIATED:
2150                 ieee80211_associated(sdata);
2151                 break;
2152         default:
2153                 WARN_ON(1);
2154                 break;
2155         }
2156
2157         if (ieee80211_privacy_mismatch(sdata)) {
2158                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2159                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2160
2161                 ieee80211_set_disassoc(sdata, false, true,
2162                                         WLAN_REASON_UNSPECIFIED);
2163         }
2164 }
2165
2166 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2167 {
2168         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2169                 /*
2170                  * Need to update last_beacon to avoid beacon loss
2171                  * test to trigger.
2172                  */
2173                 sdata->u.mgd.last_beacon = jiffies;
2174
2175
2176                 queue_work(sdata->local->hw.workqueue,
2177                            &sdata->u.mgd.work);
2178         }
2179 }
2180
2181 /* interface setup */
2182 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2183 {
2184         struct ieee80211_if_managed *ifmgd;
2185         u32 hw_flags;
2186
2187         ifmgd = &sdata->u.mgd;
2188         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2189         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2190         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2191         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2192                     (unsigned long) sdata);
2193         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2194                     (unsigned long) sdata);
2195         skb_queue_head_init(&ifmgd->skb_queue);
2196
2197         ifmgd->capab = WLAN_CAPABILITY_ESS;
2198         ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2199                 IEEE80211_AUTH_ALG_SHARED_KEY;
2200         ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
2201                 IEEE80211_STA_AUTO_BSSID_SEL |
2202                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2203         if (sdata->local->hw.queues >= 4)
2204                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2205
2206         hw_flags = sdata->local->hw.flags;
2207
2208         if (hw_flags & IEEE80211_HW_SUPPORTS_PS) {
2209                 ifmgd->powersave = CONFIG_MAC80211_DEFAULT_PS_VALUE;
2210                 sdata->local->hw.conf.dynamic_ps_timeout = 500;
2211         }
2212 }
2213
2214 /* configuration hooks */
2215 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
2216 {
2217         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2218         struct ieee80211_local *local = sdata->local;
2219
2220         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2221                 return;
2222
2223         if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
2224                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2225             (ifmgd->flags & (IEEE80211_STA_SSID_SET |
2226                              IEEE80211_STA_AUTO_SSID_SEL))) {
2227
2228                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2229                         ieee80211_set_disassoc(sdata, true, true,
2230                                                WLAN_REASON_DEAUTH_LEAVING);
2231
2232                 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) ||
2233                     ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
2234                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2235                 else if (ifmgd->flags & IEEE80211_STA_EXT_SME)
2236                         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2237                 queue_work(local->hw.workqueue, &ifmgd->work);
2238         }
2239 }
2240
2241 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
2242 {
2243         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2244
2245         if (ifmgd->ssid_len)
2246                 ifmgd->flags |= IEEE80211_STA_SSID_SET;
2247         else
2248                 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
2249
2250         return 0;
2251 }
2252
2253 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2254 {
2255         struct ieee80211_if_managed *ifmgd;
2256
2257         if (len > IEEE80211_MAX_SSID_LEN)
2258                 return -EINVAL;
2259
2260         ifmgd = &sdata->u.mgd;
2261
2262         if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
2263                 /*
2264                  * Do not use reassociation if SSID is changed (different ESS).
2265                  */
2266                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2267                 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
2268                 memcpy(ifmgd->ssid, ssid, len);
2269                 ifmgd->ssid_len = len;
2270         }
2271
2272         return ieee80211_sta_commit(sdata);
2273 }
2274
2275 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2276 {
2277         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2278         memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
2279         *len = ifmgd->ssid_len;
2280         return 0;
2281 }
2282
2283 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2284 {
2285         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2286
2287         if (is_valid_ether_addr(bssid)) {
2288                 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
2289                 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
2290         } else {
2291                 memset(ifmgd->bssid, 0, ETH_ALEN);
2292                 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
2293         }
2294
2295         if (netif_running(sdata->dev))
2296                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2297
2298         return ieee80211_sta_commit(sdata);
2299 }
2300
2301 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
2302                                const char *ie, size_t len)
2303 {
2304         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2305
2306         kfree(ifmgd->extra_ie);
2307         if (len == 0) {
2308                 ifmgd->extra_ie = NULL;
2309                 ifmgd->extra_ie_len = 0;
2310                 return 0;
2311         }
2312         ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
2313         if (!ifmgd->extra_ie) {
2314                 ifmgd->extra_ie_len = 0;
2315                 return -ENOMEM;
2316         }
2317         memcpy(ifmgd->extra_ie, ie, len);
2318         ifmgd->extra_ie_len = len;
2319         return 0;
2320 }
2321
2322 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2323 {
2324         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2325                sdata->dev->name, reason);
2326
2327         ieee80211_set_disassoc(sdata, true, true, reason);
2328         return 0;
2329 }
2330
2331 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2332 {
2333         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2334
2335         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2336                sdata->dev->name, reason);
2337
2338         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
2339                 return -ENOLINK;
2340
2341         ieee80211_set_disassoc(sdata, false, true, reason);
2342         return 0;
2343 }
2344
2345 /* scan finished notification */
2346 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2347 {
2348         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2349
2350         /* Restart STA timers */
2351         rcu_read_lock();
2352         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2353                 ieee80211_restart_sta_timer(sdata);
2354         rcu_read_unlock();
2355 }
2356
2357 int ieee80211_max_network_latency(struct notifier_block *nb,
2358                                   unsigned long data, void *dummy)
2359 {
2360         s32 latency_usec = (s32) data;
2361         struct ieee80211_local *local =
2362                 container_of(nb, struct ieee80211_local,
2363                              network_latency_notifier);
2364
2365         mutex_lock(&local->iflist_mtx);
2366         ieee80211_recalc_ps(local, latency_usec);
2367         mutex_unlock(&local->iflist_mtx);
2368
2369         return 0;
2370 }