SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <net/mac80211.h>
  21 #include <asm/unaligned.h>
  22
  23 #include "ieee80211_i.h"
  24 #include "rate.h"
  25 #include "led.h"
  26
  27 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
  28 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  29 #define IEEE80211_AUTH_MAX_TRIES 3
  30 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  31 #define IEEE80211_ASSOC_MAX_TRIES 3
  32 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  33 #define IEEE80211_PROBE_IDLE_TIME (60 * HZ)
  34 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  35
  36 /* utils */
  37 static int ecw2cw(int ecw)
  38 {
  39         return (1 << ecw) - 1;
  40 }
  41
  42 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  43 {
  44         u8 *end, *pos;
  45
  46         pos = bss->cbss.information_elements;
  47         if (pos == NULL)
  48                 return NULL;
  49         end = pos + bss->cbss.len_information_elements;
  50
  51         while (pos + 1 < end) {
  52                 if (pos + 2 + pos[1] > end)
  53                         break;
  54                 if (pos[0] == ie)
  55                         return pos;
  56                 pos += 2 + pos[1];
  57         }
  58
  59         return NULL;
  60 }
  61
  62 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  63                                       struct ieee80211_supported_band *sband,
  64                                       u32 *rates)
  65 {
  66         int i, j, count;
  67         *rates = 0;
  68         count = 0;
  69         for (i = 0; i < bss->supp_rates_len; i++) {
  70                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  71
  72                 for (j = 0; j < sband->n_bitrates; j++)
  73                         if (sband->bitrates[j].bitrate == rate) {
  74                                 *rates |= BIT(j);
  75                                 count++;
  76                                 break;
  77                         }
  78         }
  79
  80         return count;
  81 }
  82
  83 /*
  84  * ieee80211_enable_ht should be called only after the operating band
  85  * has been determined as ht configuration depends on the hw's
  86  * HT abilities for a specific band.
  87  */
  88 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
  89                                struct ieee80211_ht_info *hti,
  90                                u16 ap_ht_cap_flags)
  91 {
  92         struct ieee80211_local *local = sdata->local;
  93         struct ieee80211_supported_band *sband;
  94         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  95         struct ieee80211_bss_ht_conf ht;
  96         struct sta_info *sta;
  97         u32 changed = 0;
  98         bool enable_ht = true, ht_changed;
  99         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 100
 101         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 102
 103         memset(&ht, 0, sizeof(ht));
 104
 105         /* HT is not supported */
 106         if (!sband->ht_cap.ht_supported)
 107                 enable_ht = false;
 108
 109         /* check that channel matches the right operating channel */
 110         if (local->hw.conf.channel->center_freq !=
 111             ieee80211_channel_to_frequency(hti->control_chan))
 112                 enable_ht = false;
 113
 114         if (enable_ht) {
 115                 channel_type = NL80211_CHAN_HT20;
 116
 117                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 118                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 119                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 120                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 121                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 122                                 channel_type = NL80211_CHAN_HT40PLUS;
 123                                 break;
 124                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 125                                 channel_type = NL80211_CHAN_HT40MINUS;
 126                                 break;
 127                         }
 128                 }
 129         }
 130
 131         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 132                      channel_type != local->hw.conf.channel_type;
 133
 134         local->oper_channel_type = channel_type;
 135
 136         if (ht_changed) {
 137                 /* channel_type change automatically detected */
 138                 ieee80211_hw_config(local, 0);
 139
 140                 rcu_read_lock();
 141
 142                 sta = sta_info_get(local, ifmgd->bssid);
 143                 if (sta)
 144                         rate_control_rate_update(local, sband, sta,
 145                                                  IEEE80211_RC_HT_CHANGED);
 146
 147                 rcu_read_unlock();
 148
 149         }
 150
 151         /* disable HT */
 152         if (!enable_ht)
 153                 return 0;
 154
 155         ht.operation_mode = le16_to_cpu(hti->operation_mode);
 156
 157         /* if bss configuration changed store the new one */
 158         if (memcmp(&sdata->vif.bss_conf.ht, &ht, sizeof(ht))) {
 159                 changed |= BSS_CHANGED_HT;
 160                 sdata->vif.bss_conf.ht = ht;
 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 /* MLME */
 450 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 451                                      struct ieee80211_if_managed *ifmgd,
 452                                      u8 *wmm_param, size_t wmm_param_len)
 453 {
 454         struct ieee80211_tx_queue_params params;
 455         size_t left;
 456         int count;
 457         u8 *pos;
 458
 459         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
 460                 return;
 461
 462         if (!wmm_param)
 463                 return;
 464
 465         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 466                 return;
 467         count = wmm_param[6] & 0x0f;
 468         if (count == ifmgd->wmm_last_param_set)
 469                 return;
 470         ifmgd->wmm_last_param_set = count;
 471
 472         pos = wmm_param + 8;
 473         left = wmm_param_len - 8;
 474
 475         memset(&params, 0, sizeof(params));
 476
 477         local->wmm_acm = 0;
 478         for (; left >= 4; left -= 4, pos += 4) {
 479                 int aci = (pos[0] >> 5) & 0x03;
 480                 int acm = (pos[0] >> 4) & 0x01;
 481                 int queue;
 482
 483                 switch (aci) {
 484                 case 1: /* AC_BK */
 485                         queue = 3;
 486                         if (acm)
 487                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 488                         break;
 489                 case 2: /* AC_VI */
 490                         queue = 1;
 491                         if (acm)
 492                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 493                         break;
 494                 case 3: /* AC_VO */
 495                         queue = 0;
 496                         if (acm)
 497                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 498                         break;
 499                 case 0: /* AC_BE */
 500                 default:
 501                         queue = 2;
 502                         if (acm)
 503                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 504                         break;
 505                 }
 506
 507                 params.aifs = pos[0] & 0x0f;
 508                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 509                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 510                 params.txop = get_unaligned_le16(pos + 2);
 511 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 512                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 513                        "cWmin=%d cWmax=%d txop=%d\n",
 514                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 515                        params.cw_max, params.txop);
 516 #endif
 517                 if (local->ops->conf_tx &&
 518                     local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 519                         printk(KERN_DEBUG "%s: failed to set TX queue "
 520                                "parameters for queue %d\n", local->mdev->name, queue);
 521                 }
 522         }
 523 }
 524
 525 static bool ieee80211_check_tim(struct ieee802_11_elems *elems, u16 aid)
 526 {
 527         u8 mask;
 528         u8 index, indexn1, indexn2;
 529         struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
 530
 531         if (unlikely(!tim || elems->tim_len < 4))
 532                 return false;
 533
 534         aid &= 0x3fff;
 535         index = aid / 8;
 536         mask  = 1 << (aid & 7);
 537
 538         indexn1 = tim->bitmap_ctrl & 0xfe;
 539         indexn2 = elems->tim_len + indexn1 - 4;
 540
 541         if (index < indexn1 || index > indexn2)
 542                 return false;
 543
 544         index -= indexn1;
 545
 546         return !!(tim->virtual_map[index] & mask);
 547 }
 548
 549 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 550                                            u16 capab, bool erp_valid, u8 erp)
 551 {
 552         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 553 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 554         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 555 #endif
 556         u32 changed = 0;
 557         bool use_protection;
 558         bool use_short_preamble;
 559         bool use_short_slot;
 560
 561         if (erp_valid) {
 562                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 563                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 564         } else {
 565                 use_protection = false;
 566                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 567         }
 568
 569         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 570
 571         if (use_protection != bss_conf->use_cts_prot) {
 572 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 573                 if (net_ratelimit()) {
 574                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 575                                sdata->dev->name,
 576                                use_protection ? "enabled" : "disabled",
 577                                ifmgd->bssid);
 578                 }
 579 #endif
 580                 bss_conf->use_cts_prot = use_protection;
 581                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 582         }
 583
 584         if (use_short_preamble != bss_conf->use_short_preamble) {
 585 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 586                 if (net_ratelimit()) {
 587                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 588                                " (BSSID=%pM)\n",
 589                                sdata->dev->name,
 590                                use_short_preamble ? "short" : "long",
 591                                ifmgd->bssid);
 592                 }
 593 #endif
 594                 bss_conf->use_short_preamble = use_short_preamble;
 595                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 596         }
 597
 598         if (use_short_slot != bss_conf->use_short_slot) {
 599 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 600                 if (net_ratelimit()) {
 601                         printk(KERN_DEBUG "%s: switched to %s slot time"
 602                                " (BSSID=%pM)\n",
 603                                sdata->dev->name,
 604                                use_short_slot ? "short" : "long",
 605                                ifmgd->bssid);
 606                 }
 607 #endif
 608                 bss_conf->use_short_slot = use_short_slot;
 609                 changed |= BSS_CHANGED_ERP_SLOT;
 610         }
 611
 612         return changed;
 613 }
 614
 615 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata)
 616 {
 617         union iwreq_data wrqu;
 618
 619         memset(&wrqu, 0, sizeof(wrqu));
 620         if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED)
 621                 memcpy(wrqu.ap_addr.sa_data, sdata->u.mgd.bssid, ETH_ALEN);
 622         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 623         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 624 }
 625
 626 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata)
 627 {
 628         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 629         char *buf;
 630         size_t len;
 631         int i;
 632         union iwreq_data wrqu;
 633
 634         if (!ifmgd->assocreq_ies && !ifmgd->assocresp_ies)
 635                 return;
 636
 637         buf = kmalloc(50 + 2 * (ifmgd->assocreq_ies_len +
 638                                 ifmgd->assocresp_ies_len), GFP_KERNEL);
 639         if (!buf)
 640                 return;
 641
 642         len = sprintf(buf, "ASSOCINFO(");
 643         if (ifmgd->assocreq_ies) {
 644                 len += sprintf(buf + len, "ReqIEs=");
 645                 for (i = 0; i < ifmgd->assocreq_ies_len; i++) {
 646                         len += sprintf(buf + len, "%02x",
 647                                        ifmgd->assocreq_ies[i]);
 648                 }
 649         }
 650         if (ifmgd->assocresp_ies) {
 651                 if (ifmgd->assocreq_ies)
 652                         len += sprintf(buf + len, " ");
 653                 len += sprintf(buf + len, "RespIEs=");
 654                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 655                         len += sprintf(buf + len, "%02x",
 656                                        ifmgd->assocresp_ies[i]);
 657                 }
 658         }
 659         len += sprintf(buf + len, ")");
 660
 661         if (len > IW_CUSTOM_MAX) {
 662                 len = sprintf(buf, "ASSOCRESPIE=");
 663                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 664                         len += sprintf(buf + len, "%02x",
 665                                        ifmgd->assocresp_ies[i]);
 666                 }
 667         }
 668
 669         if (len <= IW_CUSTOM_MAX) {
 670                 memset(&wrqu, 0, sizeof(wrqu));
 671                 wrqu.data.length = len;
 672                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 673         }
 674
 675         kfree(buf);
 676 }
 677
 678
 679 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 680                                      u32 bss_info_changed)
 681 {
 682         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 683         struct ieee80211_local *local = sdata->local;
 684         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 685
 686         struct ieee80211_bss *bss;
 687
 688         bss_info_changed |= BSS_CHANGED_ASSOC;
 689         ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
 690
 691         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 692                                    conf->channel->center_freq,
 693                                    ifmgd->ssid, ifmgd->ssid_len);
 694         if (bss) {
 695                 /* set timing information */
 696                 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 697                 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 698                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 699
 700                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 701                         bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 702
 703                 cfg80211_hold_bss(&bss->cbss);
 704
 705                 ieee80211_rx_bss_put(local, bss);
 706         }
 707
 708         ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
 709         memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
 710         ieee80211_sta_send_associnfo(sdata);
 711
 712         ifmgd->last_probe = jiffies;
 713         ieee80211_led_assoc(local, 1);
 714
 715         sdata->vif.bss_conf.assoc = 1;
 716         /*
 717          * For now just always ask the driver to update the basic rateset
 718          * when we have associated, we aren't checking whether it actually
 719          * changed or not.
 720          */
 721         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 722         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 723
 724         if (local->powersave) {
 725                 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
 726                     local->hw.conf.dynamic_ps_timeout > 0) {
 727                         mod_timer(&local->dynamic_ps_timer, jiffies +
 728                                   msecs_to_jiffies(
 729                                         local->hw.conf.dynamic_ps_timeout));
 730                 } else {
 731                         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 732                                 ieee80211_send_nullfunc(local, sdata, 1);
 733                         conf->flags |= IEEE80211_CONF_PS;
 734                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 735                 }
 736         }
 737
 738         netif_tx_start_all_queues(sdata->dev);
 739         netif_carrier_on(sdata->dev);
 740
 741         ieee80211_sta_send_apinfo(sdata);
 742 }
 743
 744 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
 745 {
 746         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 747         struct ieee80211_local *local = sdata->local;
 748
 749         ifmgd->direct_probe_tries++;
 750         if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 751                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 752                        sdata->dev->name, ifmgd->bssid);
 753                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 754                 ieee80211_sta_send_apinfo(sdata);
 755
 756                 /*
 757                  * Most likely AP is not in the range so remove the
 758                  * bss information associated to the AP
 759                  */
 760                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 761                                 sdata->local->hw.conf.channel->center_freq,
 762                                 ifmgd->ssid, ifmgd->ssid_len);
 763
 764                 /*
 765                  * We might have a pending scan which had no chance to run yet
 766                  * due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
 767                  * Hence, queue the STAs work again
 768                  */
 769                 queue_work(local->hw.workqueue, &ifmgd->work);
 770                 return;
 771         }
 772
 773         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 774                         sdata->dev->name, ifmgd->bssid,
 775                         ifmgd->direct_probe_tries);
 776
 777         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 778
 779         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifmgd->request);
 780
 781         /* Direct probe is sent to broadcast address as some APs
 782          * will not answer to direct packet in unassociated state.
 783          */
 784         ieee80211_send_probe_req(sdata, NULL,
 785                                  ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
 786
 787         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 788 }
 789
 790
 791 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
 792 {
 793         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 794         struct ieee80211_local *local = sdata->local;
 795         u8 *ies;
 796         size_t ies_len;
 797
 798         ifmgd->auth_tries++;
 799         if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 800                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 801                        " timed out\n",
 802                        sdata->dev->name, ifmgd->bssid);
 803                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 804                 ieee80211_sta_send_apinfo(sdata);
 805                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 806                                 sdata->local->hw.conf.channel->center_freq,
 807                                 ifmgd->ssid, ifmgd->ssid_len);
 808
 809                 /*
 810                  * We might have a pending scan which had no chance to run yet
 811                  * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
 812                  * Hence, queue the STAs work again
 813                  */
 814                 queue_work(local->hw.workqueue, &ifmgd->work);
 815                 return;
 816         }
 817
 818         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
 819         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 820                sdata->dev->name, ifmgd->bssid);
 821
 822         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
 823                 ies = ifmgd->sme_auth_ie;
 824                 ies_len = ifmgd->sme_auth_ie_len;
 825         } else {
 826                 ies = NULL;
 827                 ies_len = 0;
 828         }
 829         ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len,
 830                             ifmgd->bssid, 0);
 831         ifmgd->auth_transaction = 2;
 832
 833         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 834 }
 835
 836 /*
 837  * The disassoc 'reason' argument can be either our own reason
 838  * if self disconnected or a reason code from the AP.
 839  */
 840 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 841                                    bool deauth, bool self_disconnected,
 842                                    u16 reason)
 843 {
 844         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 845         struct ieee80211_local *local = sdata->local;
 846         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 847         struct ieee80211_bss *bss;
 848         struct sta_info *sta;
 849         u32 changed = 0, config_changed = 0;
 850
 851         rcu_read_lock();
 852
 853         sta = sta_info_get(local, ifmgd->bssid);
 854         if (!sta) {
 855                 rcu_read_unlock();
 856                 return;
 857         }
 858
 859         if (deauth) {
 860                 ifmgd->direct_probe_tries = 0;
 861                 ifmgd->auth_tries = 0;
 862         }
 863         ifmgd->assoc_scan_tries = 0;
 864         ifmgd->assoc_tries = 0;
 865
 866         netif_tx_stop_all_queues(sdata->dev);
 867         netif_carrier_off(sdata->dev);
 868
 869         ieee80211_sta_tear_down_BA_sessions(sta);
 870
 871         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 872                                    conf->channel->center_freq,
 873                                    ifmgd->ssid, ifmgd->ssid_len);
 874
 875         if (bss) {
 876                 cfg80211_unhold_bss(&bss->cbss);
 877                 ieee80211_rx_bss_put(local, bss);
 878         }
 879
 880         if (self_disconnected) {
 881                 if (deauth)
 882                         ieee80211_send_deauth_disassoc(sdata,
 883                                 IEEE80211_STYPE_DEAUTH, reason);
 884                 else
 885                         ieee80211_send_deauth_disassoc(sdata,
 886                                 IEEE80211_STYPE_DISASSOC, reason);
 887         }
 888
 889         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
 890         changed |= ieee80211_reset_erp_info(sdata);
 891
 892         ieee80211_led_assoc(local, 0);
 893         changed |= BSS_CHANGED_ASSOC;
 894         sdata->vif.bss_conf.assoc = false;
 895
 896         ieee80211_sta_send_apinfo(sdata);
 897
 898         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
 899                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 900                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 901                                 sdata->local->hw.conf.channel->center_freq,
 902                                 ifmgd->ssid, ifmgd->ssid_len);
 903         }
 904
 905         rcu_read_unlock();
 906
 907         /* channel(_type) changes are handled by ieee80211_hw_config */
 908         local->oper_channel_type = NL80211_CHAN_NO_HT;
 909
 910         local->power_constr_level = 0;
 911
 912         del_timer_sync(&local->dynamic_ps_timer);
 913         cancel_work_sync(&local->dynamic_ps_enable_work);
 914
 915         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 916                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 917                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 918         }
 919
 920         ieee80211_hw_config(local, config_changed);
 921         ieee80211_bss_info_change_notify(sdata, changed);
 922
 923         rcu_read_lock();
 924
 925         sta = sta_info_get(local, ifmgd->bssid);
 926         if (!sta) {
 927                 rcu_read_unlock();
 928                 return;
 929         }
 930
 931         sta_info_unlink(&sta);
 932
 933         rcu_read_unlock();
 934
 935         sta_info_destroy(sta);
 936 }
 937
 938 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
 939 {
 940         if (!sdata || !sdata->default_key ||
 941             sdata->default_key->conf.alg != ALG_WEP)
 942                 return 0;
 943         return 1;
 944 }
 945
 946 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
 947 {
 948         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 949         struct ieee80211_local *local = sdata->local;
 950         struct ieee80211_bss *bss;
 951         int bss_privacy;
 952         int wep_privacy;
 953         int privacy_invoked;
 954
 955         if (!ifmgd || (ifmgd->flags & IEEE80211_STA_EXT_SME))
 956                 return 0;
 957
 958         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 959                                    local->hw.conf.channel->center_freq,
 960                                    ifmgd->ssid, ifmgd->ssid_len);
 961         if (!bss)
 962                 return 0;
 963
 964         bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
 965         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
 966         privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
 967
 968         ieee80211_rx_bss_put(local, bss);
 969
 970         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
 971                 return 0;
 972
 973         return 1;
 974 }
 975
 976 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
 977 {
 978         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 979         struct ieee80211_local *local = sdata->local;
 980
 981         ifmgd->assoc_tries++;
 982         if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 983                 printk(KERN_DEBUG "%s: association with AP %pM"
 984                        " timed out\n",
 985                        sdata->dev->name, ifmgd->bssid);
 986                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 987                 ieee80211_sta_send_apinfo(sdata);
 988                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 989                                 sdata->local->hw.conf.channel->center_freq,
 990                                 ifmgd->ssid, ifmgd->ssid_len);
 991                 /*
 992                  * We might have a pending scan which had no chance to run yet
 993                  * due to state == IEEE80211_STA_MLME_ASSOCIATE.
 994                  * Hence, queue the STAs work again
 995                  */
 996                 queue_work(local->hw.workqueue, &ifmgd->work);
 997                 return;
 998         }
 999
1000         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1001         printk(KERN_DEBUG "%s: associate with AP %pM\n",
1002                sdata->dev->name, ifmgd->bssid);
1003         if (ieee80211_privacy_mismatch(sdata)) {
1004                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1005                        "mixed-cell disabled - abort association\n", sdata->dev->name);
1006                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1007                 return;
1008         }
1009
1010         ieee80211_send_assoc(sdata);
1011
1012         mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1013 }
1014
1015 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1016                              struct ieee80211_hdr *hdr)
1017 {
1018         /*
1019          * We can postpone the mgd.timer whenever receiving unicast frames
1020          * from AP because we know that the connection is working both ways
1021          * at that time. But multicast frames (and hence also beacons) must
1022          * be ignored here, because we need to trigger the timer during
1023          * data idle periods for sending the periodical probe request to
1024          * the AP.
1025          */
1026         if (!is_multicast_ether_addr(hdr->addr1))
1027                 mod_timer(&sdata->u.mgd.timer,
1028                           jiffies + IEEE80211_MONITORING_INTERVAL);
1029 }
1030
1031 void ieee80211_beacon_loss_work(struct work_struct *work)
1032 {
1033         struct ieee80211_sub_if_data *sdata =
1034                 container_of(work, struct ieee80211_sub_if_data,
1035                              u.mgd.beacon_loss_work);
1036         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1037
1038 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1039         if (net_ratelimit()) {
1040                 printk(KERN_DEBUG "%s: driver reports beacon loss from AP %pM "
1041                        "- sending probe request\n", sdata->dev->name,
1042                        sdata->u.mgd.bssid);
1043         }
1044 #endif
1045
1046         ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1047         ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1048                                  ifmgd->ssid_len, NULL, 0);
1049
1050         mod_timer(&ifmgd->timer, jiffies + IEEE80211_MONITORING_INTERVAL);
1051 }
1052
1053 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1054 {
1055         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1056
1057         queue_work(sdata->local->hw.workqueue,
1058                    &sdata->u.mgd.beacon_loss_work);
1059 }
1060 EXPORT_SYMBOL(ieee80211_beacon_loss);
1061
1062 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
1063 {
1064         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1065         struct ieee80211_local *local = sdata->local;
1066         struct sta_info *sta;
1067         bool disassoc = false;
1068
1069         /* TODO: start monitoring current AP signal quality and number of
1070          * missed beacons. Scan other channels every now and then and search
1071          * for better APs. */
1072         /* TODO: remove expired BSSes */
1073
1074         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
1075
1076         rcu_read_lock();
1077
1078         sta = sta_info_get(local, ifmgd->bssid);
1079         if (!sta) {
1080                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1081                        sdata->dev->name, ifmgd->bssid);
1082                 disassoc = true;
1083                 goto unlock;
1084         }
1085
1086         if ((ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) &&
1087             time_after(jiffies, sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1088                 printk(KERN_DEBUG "%s: no probe response from AP %pM "
1089                        "- disassociating\n",
1090                        sdata->dev->name, ifmgd->bssid);
1091                 disassoc = true;
1092                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1093                 goto unlock;
1094         }
1095
1096         /*
1097          * Beacon filtering is only enabled with power save and then the
1098          * stack should not check for beacon loss.
1099          */
1100         if (!((local->hw.flags & IEEE80211_HW_BEACON_FILTER) &&
1101               (local->hw.conf.flags & IEEE80211_CONF_PS)) &&
1102             time_after(jiffies,
1103                        ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) {
1104 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1105                 if (net_ratelimit()) {
1106                         printk(KERN_DEBUG "%s: beacon loss from AP %pM "
1107                                "- sending probe request\n",
1108                                sdata->dev->name, ifmgd->bssid);
1109                 }
1110 #endif
1111                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1112                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1113                                          ifmgd->ssid_len, NULL, 0);
1114                 goto unlock;
1115
1116         }
1117
1118         if (time_after(jiffies, sta->last_rx + IEEE80211_PROBE_IDLE_TIME)) {
1119                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1120                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1121                                          ifmgd->ssid_len, NULL, 0);
1122         }
1123
1124  unlock:
1125         rcu_read_unlock();
1126
1127         if (disassoc)
1128                 ieee80211_set_disassoc(sdata, true, true,
1129                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1130         else
1131                 mod_timer(&ifmgd->timer, jiffies +
1132                                       IEEE80211_MONITORING_INTERVAL);
1133 }
1134
1135
1136 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
1137 {
1138         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1139
1140         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1141         ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
1142         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1143                 /* Wait for SME to request association */
1144                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1145         } else
1146                 ieee80211_associate(sdata);
1147 }
1148
1149
1150 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1151                                      struct ieee80211_mgmt *mgmt,
1152                                      size_t len)
1153 {
1154         u8 *pos;
1155         struct ieee802_11_elems elems;
1156
1157         pos = mgmt->u.auth.variable;
1158         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1159         if (!elems.challenge)
1160                 return;
1161         ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
1162                             elems.challenge - 2, elems.challenge_len + 2,
1163                             sdata->u.mgd.bssid, 1);
1164         sdata->u.mgd.auth_transaction = 4;
1165 }
1166
1167 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1168                                    struct ieee80211_mgmt *mgmt,
1169                                    size_t len)
1170 {
1171         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1172         u16 auth_alg, auth_transaction, status_code;
1173
1174         if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1175                 return;
1176
1177         if (len < 24 + 6)
1178                 return;
1179
1180         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1181                 return;
1182
1183         if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1184                 return;
1185
1186         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1187         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1188         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1189
1190         if (auth_alg != ifmgd->auth_alg ||
1191             auth_transaction != ifmgd->auth_transaction)
1192                 return;
1193
1194         if (status_code != WLAN_STATUS_SUCCESS) {
1195                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1196                         u8 algs[3];
1197                         const int num_algs = ARRAY_SIZE(algs);
1198                         int i, pos;
1199                         algs[0] = algs[1] = algs[2] = 0xff;
1200                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1201                                 algs[0] = WLAN_AUTH_OPEN;
1202                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1203                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1204                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1205                                 algs[2] = WLAN_AUTH_LEAP;
1206                         if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1207                                 pos = 0;
1208                         else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1209                                 pos = 1;
1210                         else
1211                                 pos = 2;
1212                         for (i = 0; i < num_algs; i++) {
1213                                 pos++;
1214                                 if (pos >= num_algs)
1215                                         pos = 0;
1216                                 if (algs[pos] == ifmgd->auth_alg ||
1217                                     algs[pos] == 0xff)
1218                                         continue;
1219                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1220                                     !ieee80211_sta_wep_configured(sdata))
1221                                         continue;
1222                                 ifmgd->auth_alg = algs[pos];
1223                                 break;
1224                         }
1225                 }
1226                 return;
1227         }
1228
1229         switch (ifmgd->auth_alg) {
1230         case WLAN_AUTH_OPEN:
1231         case WLAN_AUTH_LEAP:
1232         case WLAN_AUTH_FT:
1233                 ieee80211_auth_completed(sdata);
1234                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1235                 break;
1236         case WLAN_AUTH_SHARED_KEY:
1237                 if (ifmgd->auth_transaction == 4) {
1238                         ieee80211_auth_completed(sdata);
1239                         cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1240                 } else
1241                         ieee80211_auth_challenge(sdata, mgmt, len);
1242                 break;
1243         }
1244 }
1245
1246
1247 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1248                                      struct ieee80211_mgmt *mgmt,
1249                                      size_t len)
1250 {
1251         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1252         u16 reason_code;
1253
1254         if (len < 24 + 2)
1255                 return;
1256
1257         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1258                 return;
1259
1260         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1261
1262         if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1263                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1264                                 sdata->dev->name, reason_code);
1265
1266         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1267             (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1268              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1269              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)) {
1270                 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1271                 mod_timer(&ifmgd->timer, jiffies +
1272                                       IEEE80211_RETRY_AUTH_INTERVAL);
1273         }
1274
1275         ieee80211_set_disassoc(sdata, true, false, 0);
1276         ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1277         cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, len);
1278 }
1279
1280
1281 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1282                                        struct ieee80211_mgmt *mgmt,
1283                                        size_t len)
1284 {
1285         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1286         u16 reason_code;
1287
1288         if (len < 24 + 2)
1289                 return;
1290
1291         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1292                 return;
1293
1294         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1295
1296         if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1297                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1298                                 sdata->dev->name, reason_code);
1299
1300         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1301             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1302                 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1303                 mod_timer(&ifmgd->timer, jiffies +
1304                                       IEEE80211_RETRY_AUTH_INTERVAL);
1305         }
1306
1307         ieee80211_set_disassoc(sdata, false, false, reason_code);
1308         cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, len);
1309 }
1310
1311
1312 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1313                                          struct ieee80211_mgmt *mgmt,
1314                                          size_t len,
1315                                          int reassoc)
1316 {
1317         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1318         struct ieee80211_local *local = sdata->local;
1319         struct ieee80211_supported_band *sband;
1320         struct sta_info *sta;
1321         u32 rates, basic_rates;
1322         u16 capab_info, status_code, aid;
1323         struct ieee802_11_elems elems;
1324         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1325         u8 *pos;
1326         u32 changed = 0;
1327         int i, j;
1328         bool have_higher_than_11mbit = false, newsta = false;
1329         u16 ap_ht_cap_flags;
1330
1331         /* AssocResp and ReassocResp have identical structure, so process both
1332          * of them in this function. */
1333
1334         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1335                 return;
1336
1337         if (len < 24 + 6)
1338                 return;
1339
1340         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1341                 return;
1342
1343         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1344         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1345         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1346
1347         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1348                "status=%d aid=%d)\n",
1349                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1350                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1351
1352         pos = mgmt->u.assoc_resp.variable;
1353         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1354
1355         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1356             elems.timeout_int && elems.timeout_int_len == 5 &&
1357             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1358                 u32 tu, ms;
1359                 tu = get_unaligned_le32(elems.timeout_int + 1);
1360                 ms = tu * 1024 / 1000;
1361                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1362                        "comeback duration %u TU (%u ms)\n",
1363                        sdata->dev->name, tu, ms);
1364                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1365                         mod_timer(&ifmgd->timer,
1366                                   jiffies + msecs_to_jiffies(ms));
1367                 return;
1368         }
1369
1370         if (status_code != WLAN_STATUS_SUCCESS) {
1371                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1372                        sdata->dev->name, status_code);
1373                 /* if this was a reassociation, ensure we try a "full"
1374                  * association next time. This works around some broken APs
1375                  * which do not correctly reject reassociation requests. */
1376                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1377                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1378                 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1379                         /* Wait for SME to decide what to do next */
1380                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1381                 }
1382                 return;
1383         }
1384
1385         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1386                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1387                        "set\n", sdata->dev->name, aid);
1388         aid &= ~(BIT(15) | BIT(14));
1389
1390         if (!elems.supp_rates) {
1391                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1392                        sdata->dev->name);
1393                 return;
1394         }
1395
1396         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1397         ifmgd->aid = aid;
1398         ifmgd->ap_capab = capab_info;
1399
1400         kfree(ifmgd->assocresp_ies);
1401         ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1402         ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1403         if (ifmgd->assocresp_ies)
1404                 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1405
1406         rcu_read_lock();
1407
1408         /* Add STA entry for the AP */
1409         sta = sta_info_get(local, ifmgd->bssid);
1410         if (!sta) {
1411                 newsta = true;
1412
1413                 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1414                 if (!sta) {
1415                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1416                                " the AP\n", sdata->dev->name);
1417                         rcu_read_unlock();
1418                         return;
1419                 }
1420
1421                 /* update new sta with its last rx activity */
1422                 sta->last_rx = jiffies;
1423         }
1424
1425         /*
1426          * FIXME: Do we really need to update the sta_info's information here?
1427          *        We already know about the AP (we found it in our list) so it
1428          *        should already be filled with the right info, no?
1429          *        As is stands, all this is racy because typically we assume
1430          *        the information that is filled in here (except flags) doesn't
1431          *        change while a STA structure is alive. As such, it should move
1432          *        to between the sta_info_alloc() and sta_info_insert() above.
1433          */
1434
1435         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1436                            WLAN_STA_AUTHORIZED);
1437
1438         rates = 0;
1439         basic_rates = 0;
1440         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1441
1442         for (i = 0; i < elems.supp_rates_len; i++) {
1443                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1444                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1445
1446                 if (rate > 110)
1447                         have_higher_than_11mbit = true;
1448
1449                 for (j = 0; j < sband->n_bitrates; j++) {
1450                         if (sband->bitrates[j].bitrate == rate) {
1451                                 rates |= BIT(j);
1452                                 if (is_basic)
1453                                         basic_rates |= BIT(j);
1454                                 break;
1455                         }
1456                 }
1457         }
1458
1459         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1460                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1461                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1462
1463                 if (rate > 110)
1464                         have_higher_than_11mbit = true;
1465
1466                 for (j = 0; j < sband->n_bitrates; j++) {
1467                         if (sband->bitrates[j].bitrate == rate) {
1468                                 rates |= BIT(j);
1469                                 if (is_basic)
1470                                         basic_rates |= BIT(j);
1471                                 break;
1472                         }
1473                 }
1474         }
1475
1476         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1477         sdata->vif.bss_conf.basic_rates = basic_rates;
1478
1479         /* cf. IEEE 802.11 9.2.12 */
1480         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1481             have_higher_than_11mbit)
1482                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1483         else
1484                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1485
1486         /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1487         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1488                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1489                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1490
1491         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1492
1493         rate_control_rate_init(sta);
1494
1495         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1496                 set_sta_flags(sta, WLAN_STA_MFP);
1497
1498         if (elems.wmm_param)
1499                 set_sta_flags(sta, WLAN_STA_WME);
1500
1501         if (newsta) {
1502                 int err = sta_info_insert(sta);
1503                 if (err) {
1504                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1505                                " the AP (error %d)\n", sdata->dev->name, err);
1506                         rcu_read_unlock();
1507                         return;
1508                 }
1509         }
1510
1511         rcu_read_unlock();
1512
1513         if (elems.wmm_param)
1514                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1515                                          elems.wmm_param_len);
1516
1517         if (elems.ht_info_elem && elems.wmm_param &&
1518             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1519             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1520                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1521                                                ap_ht_cap_flags);
1522
1523         /* set AID and assoc capability,
1524          * ieee80211_set_associated() will tell the driver */
1525         bss_conf->aid = aid;
1526         bss_conf->assoc_capability = capab_info;
1527         ieee80211_set_associated(sdata, changed);
1528
1529         /*
1530          * initialise the time of last beacon to be the association time,
1531          * otherwise beacon loss check will trigger immediately
1532          */
1533         ifmgd->last_beacon = jiffies;
1534
1535         ieee80211_associated(sdata);
1536         cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1537 }
1538
1539
1540 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1541                                   struct ieee80211_mgmt *mgmt,
1542                                   size_t len,
1543                                   struct ieee80211_rx_status *rx_status,
1544                                   struct ieee802_11_elems *elems,
1545                                   bool beacon)
1546 {
1547         struct ieee80211_local *local = sdata->local;
1548         int freq;
1549         struct ieee80211_bss *bss;
1550         struct ieee80211_channel *channel;
1551
1552         if (elems->ds_params && elems->ds_params_len == 1)
1553                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1554         else
1555                 freq = rx_status->freq;
1556
1557         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1558
1559         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1560                 return;
1561
1562         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1563                                         channel, beacon);
1564         if (!bss)
1565                 return;
1566
1567         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1568             (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1569                 struct ieee80211_channel_sw_ie *sw_elem =
1570                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1571                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1572         }
1573
1574         ieee80211_rx_bss_put(local, bss);
1575 }
1576
1577
1578 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1579                                          struct ieee80211_mgmt *mgmt,
1580                                          size_t len,
1581                                          struct ieee80211_rx_status *rx_status)
1582 {
1583         struct ieee80211_if_managed *ifmgd;
1584         size_t baselen;
1585         struct ieee802_11_elems elems;
1586
1587         ifmgd = &sdata->u.mgd;
1588
1589         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1590                 return; /* ignore ProbeResp to foreign address */
1591
1592         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1593         if (baselen > len)
1594                 return;
1595
1596         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1597                                 &elems);
1598
1599         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1600
1601         /* direct probe may be part of the association flow */
1602         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1603                                &ifmgd->request)) {
1604                 printk(KERN_DEBUG "%s direct probe responded\n",
1605                        sdata->dev->name);
1606                 ieee80211_authenticate(sdata);
1607         }
1608
1609         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1610                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1611 }
1612
1613 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1614                                      struct ieee80211_mgmt *mgmt,
1615                                      size_t len,
1616                                      struct ieee80211_rx_status *rx_status)
1617 {
1618         struct ieee80211_if_managed *ifmgd;
1619         size_t baselen;
1620         struct ieee802_11_elems elems;
1621         struct ieee80211_local *local = sdata->local;
1622         u32 changed = 0;
1623         bool erp_valid, directed_tim;
1624         u8 erp_value = 0;
1625
1626         /* Process beacon from the current BSS */
1627         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1628         if (baselen > len)
1629                 return;
1630
1631         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1632
1633         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1634
1635         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1636                 return;
1637
1638         ifmgd = &sdata->u.mgd;
1639
1640         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1641             memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1642                 return;
1643
1644         if (rx_status->freq != local->hw.conf.channel->center_freq)
1645                 return;
1646
1647         ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1648                                  elems.wmm_param_len);
1649
1650         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1651                 directed_tim = ieee80211_check_tim(&elems, ifmgd->aid);
1652
1653                 if (directed_tim) {
1654                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1655                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1656                                 ieee80211_hw_config(local,
1657                                                     IEEE80211_CONF_CHANGE_PS);
1658                                 ieee80211_send_nullfunc(local, sdata, 0);
1659                         } else {
1660                                 local->pspolling = true;
1661
1662                                 /*
1663                                  * Here is assumed that the driver will be
1664                                  * able to send ps-poll frame and receive a
1665                                  * response even though power save mode is
1666                                  * enabled, but some drivers might require
1667                                  * to disable power save here. This needs
1668                                  * to be investigated.
1669                                  */
1670                                 ieee80211_send_pspoll(local, sdata);
1671                         }
1672                 }
1673         }
1674
1675         if (elems.erp_info && elems.erp_info_len >= 1) {
1676                 erp_valid = true;
1677                 erp_value = elems.erp_info[0];
1678         } else {
1679                 erp_valid = false;
1680         }
1681         changed |= ieee80211_handle_bss_capability(sdata,
1682                         le16_to_cpu(mgmt->u.beacon.capab_info),
1683                         erp_valid, erp_value);
1684
1685
1686         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1687             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
1688                 struct sta_info *sta;
1689                 struct ieee80211_supported_band *sband;
1690                 u16 ap_ht_cap_flags;
1691
1692                 rcu_read_lock();
1693
1694                 sta = sta_info_get(local, ifmgd->bssid);
1695                 if (!sta) {
1696                         rcu_read_unlock();
1697                         return;
1698                 }
1699
1700                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1701
1702                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1703                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1704
1705                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1706
1707                 rcu_read_unlock();
1708
1709                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1710                                                ap_ht_cap_flags);
1711         }
1712
1713         if (elems.country_elem) {
1714                 /* Note we are only reviewing this on beacons
1715                  * for the BSSID we are associated to */
1716                 regulatory_hint_11d(local->hw.wiphy,
1717                         elems.country_elem, elems.country_elem_len);
1718
1719                 /* TODO: IBSS also needs this */
1720                 if (elems.pwr_constr_elem)
1721                         ieee80211_handle_pwr_constr(sdata,
1722                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1723                                 elems.pwr_constr_elem,
1724                                 elems.pwr_constr_elem_len);
1725         }
1726
1727         ieee80211_bss_info_change_notify(sdata, changed);
1728 }
1729
1730 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1731                                           struct sk_buff *skb,
1732                                           struct ieee80211_rx_status *rx_status)
1733 {
1734         struct ieee80211_local *local = sdata->local;
1735         struct ieee80211_mgmt *mgmt;
1736         u16 fc;
1737
1738         if (skb->len < 24)
1739                 return RX_DROP_MONITOR;
1740
1741         mgmt = (struct ieee80211_mgmt *) skb->data;
1742         fc = le16_to_cpu(mgmt->frame_control);
1743
1744         switch (fc & IEEE80211_FCTL_STYPE) {
1745         case IEEE80211_STYPE_PROBE_REQ:
1746         case IEEE80211_STYPE_PROBE_RESP:
1747         case IEEE80211_STYPE_BEACON:
1748                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1749         case IEEE80211_STYPE_AUTH:
1750         case IEEE80211_STYPE_ASSOC_RESP:
1751         case IEEE80211_STYPE_REASSOC_RESP:
1752         case IEEE80211_STYPE_DEAUTH:
1753         case IEEE80211_STYPE_DISASSOC:
1754                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1755                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1756                 return RX_QUEUED;
1757         }
1758
1759         return RX_DROP_MONITOR;
1760 }
1761
1762 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1763                                          struct sk_buff *skb)
1764 {
1765         struct ieee80211_rx_status *rx_status;
1766         struct ieee80211_mgmt *mgmt;
1767         u16 fc;
1768
1769         rx_status = (struct ieee80211_rx_status *) skb->cb;
1770         mgmt = (struct ieee80211_mgmt *) skb->data;
1771         fc = le16_to_cpu(mgmt->frame_control);
1772
1773         switch (fc & IEEE80211_FCTL_STYPE) {
1774         case IEEE80211_STYPE_PROBE_RESP:
1775                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
1776                                              rx_status);
1777                 break;
1778         case IEEE80211_STYPE_BEACON:
1779                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1780                                          rx_status);
1781                 break;
1782         case IEEE80211_STYPE_AUTH:
1783                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
1784                 break;
1785         case IEEE80211_STYPE_ASSOC_RESP:
1786                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
1787                 break;
1788         case IEEE80211_STYPE_REASSOC_RESP:
1789                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
1790                 break;
1791         case IEEE80211_STYPE_DEAUTH:
1792                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1793                 break;
1794         case IEEE80211_STYPE_DISASSOC:
1795                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1796                 break;
1797         }
1798
1799         kfree_skb(skb);
1800 }
1801
1802 static void ieee80211_sta_timer(unsigned long data)
1803 {
1804         struct ieee80211_sub_if_data *sdata =
1805                 (struct ieee80211_sub_if_data *) data;
1806         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1807         struct ieee80211_local *local = sdata->local;
1808
1809         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1810         queue_work(local->hw.workqueue, &ifmgd->work);
1811 }
1812
1813 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
1814 {
1815         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1816         struct ieee80211_local *local = sdata->local;
1817
1818         if (local->ops->reset_tsf) {
1819                 /* Reset own TSF to allow time synchronization work. */
1820                 local->ops->reset_tsf(local_to_hw(local));
1821         }
1822
1823         ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
1824
1825
1826         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1827                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1828         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1829                 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
1830         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1831                 ifmgd->auth_alg = WLAN_AUTH_LEAP;
1832         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT)
1833                 ifmgd->auth_alg = WLAN_AUTH_FT;
1834         else
1835                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1836         ifmgd->auth_transaction = -1;
1837         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1838         ifmgd->assoc_scan_tries = 0;
1839         ifmgd->direct_probe_tries = 0;
1840         ifmgd->auth_tries = 0;
1841         ifmgd->assoc_tries = 0;
1842         netif_tx_stop_all_queues(sdata->dev);
1843         netif_carrier_off(sdata->dev);
1844 }
1845
1846 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
1847 {
1848         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1849         struct ieee80211_local *local = sdata->local;
1850         struct ieee80211_bss *bss;
1851         u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
1852         u8 ssid_len = ifmgd->ssid_len;
1853         u16 capa_mask = WLAN_CAPABILITY_ESS;
1854         u16 capa_val = WLAN_CAPABILITY_ESS;
1855         struct ieee80211_channel *chan = local->oper_channel;
1856
1857         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1858             ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
1859                             IEEE80211_STA_AUTO_BSSID_SEL |
1860                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
1861                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
1862                 if (sdata->default_key)
1863                         capa_val |= WLAN_CAPABILITY_PRIVACY;
1864         }
1865
1866         if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
1867                 chan = NULL;
1868
1869         if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1870                 bssid = NULL;
1871
1872         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
1873                 ssid = NULL;
1874                 ssid_len = 0;
1875         }
1876
1877         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
1878                                        bssid, ssid, ssid_len,
1879                                        capa_mask, capa_val);
1880
1881         if (bss) {
1882                 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
1883                 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
1884                         ieee80211_sta_set_ssid(sdata, bss->ssid,
1885                                                bss->ssid_len);
1886                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
1887                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
1888                                                     bss->supp_rates);
1889                 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
1890                         sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
1891                 else
1892                         sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
1893
1894                 /* Send out direct probe if no probe resp was received or
1895                  * the one we have is outdated
1896                  */
1897                 if (!bss->last_probe_resp ||
1898                     time_after(jiffies, bss->last_probe_resp
1899                                         + IEEE80211_SCAN_RESULT_EXPIRE))
1900                         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1901                 else
1902                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1903
1904                 ieee80211_rx_bss_put(local, bss);
1905                 ieee80211_sta_reset_auth(sdata);
1906                 return 0;
1907         } else {
1908                 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
1909                         ifmgd->assoc_scan_tries++;
1910                         /* XXX maybe racy? */
1911                         if (local->scan_req)
1912                                 return -1;
1913                         memcpy(local->int_scan_req.ssids[0].ssid,
1914                                ifmgd->ssid, IEEE80211_MAX_SSID_LEN);
1915                         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL)
1916                                 local->int_scan_req.ssids[0].ssid_len = 0;
1917                         else
1918                                 local->int_scan_req.ssids[0].ssid_len = ifmgd->ssid_len;
1919
1920                         if (ieee80211_start_scan(sdata, &local->int_scan_req))
1921                                 ieee80211_scan_failed(local);
1922
1923                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1924                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
1925                 } else {
1926                         ifmgd->assoc_scan_tries = 0;
1927                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1928                 }
1929         }
1930         return -1;
1931 }
1932
1933
1934 static void ieee80211_sta_work(struct work_struct *work)
1935 {
1936         struct ieee80211_sub_if_data *sdata =
1937                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1938         struct ieee80211_local *local = sdata->local;
1939         struct ieee80211_if_managed *ifmgd;
1940         struct sk_buff *skb;
1941
1942         if (!netif_running(sdata->dev))
1943                 return;
1944
1945         if (local->sw_scanning || local->hw_scanning)
1946                 return;
1947
1948         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1949                 return;
1950         ifmgd = &sdata->u.mgd;
1951
1952         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1953                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1954
1955         if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
1956             ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1957             ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
1958             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
1959                 /*
1960                  * The call to ieee80211_start_scan can fail but ieee80211_request_scan
1961                  * (which queued ieee80211_sta_work) did not return an error. Thus, call
1962                  * ieee80211_scan_failed here if ieee80211_start_scan fails in order to
1963                  * notify the scan requester.
1964                  */
1965                 if (ieee80211_start_scan(sdata, local->scan_req))
1966                         ieee80211_scan_failed(local);
1967                 return;
1968         }
1969
1970         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
1971                 if (ieee80211_sta_config_auth(sdata))
1972                         return;
1973                 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1974         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
1975                 return;
1976
1977         switch (ifmgd->state) {
1978         case IEEE80211_STA_MLME_DISABLED:
1979                 break;
1980         case IEEE80211_STA_MLME_DIRECT_PROBE:
1981                 ieee80211_direct_probe(sdata);
1982                 break;
1983         case IEEE80211_STA_MLME_AUTHENTICATE:
1984                 ieee80211_authenticate(sdata);
1985                 break;
1986         case IEEE80211_STA_MLME_ASSOCIATE:
1987                 ieee80211_associate(sdata);
1988                 break;
1989         case IEEE80211_STA_MLME_ASSOCIATED:
1990                 ieee80211_associated(sdata);
1991                 break;
1992         default:
1993                 WARN_ON(1);
1994                 break;
1995         }
1996
1997         if (ieee80211_privacy_mismatch(sdata)) {
1998                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
1999                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2000
2001                 ieee80211_set_disassoc(sdata, false, true,
2002                                         WLAN_REASON_UNSPECIFIED);
2003         }
2004 }
2005
2006 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2007 {
2008         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2009                 /*
2010                  * Need to update last_beacon to avoid beacon loss
2011                  * test to trigger.
2012                  */
2013                 sdata->u.mgd.last_beacon = jiffies;
2014
2015
2016                 queue_work(sdata->local->hw.workqueue,
2017                            &sdata->u.mgd.work);
2018         }
2019 }
2020
2021 /* interface setup */
2022 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2023 {
2024         struct ieee80211_if_managed *ifmgd;
2025
2026         ifmgd = &sdata->u.mgd;
2027         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2028         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2029         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2030         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2031                     (unsigned long) sdata);
2032         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2033                     (unsigned long) sdata);
2034         skb_queue_head_init(&ifmgd->skb_queue);
2035
2036         ifmgd->capab = WLAN_CAPABILITY_ESS;
2037         ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2038                 IEEE80211_AUTH_ALG_SHARED_KEY;
2039         ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
2040                 IEEE80211_STA_AUTO_BSSID_SEL |
2041                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2042         if (sdata->local->hw.queues >= 4)
2043                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2044 }
2045
2046 /* configuration hooks */
2047 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
2048 {
2049         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2050         struct ieee80211_local *local = sdata->local;
2051
2052         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2053                 return;
2054
2055         if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
2056                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2057             (ifmgd->flags & (IEEE80211_STA_SSID_SET |
2058                              IEEE80211_STA_AUTO_SSID_SEL))) {
2059
2060                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2061                         ieee80211_set_disassoc(sdata, true, true,
2062                                                WLAN_REASON_DEAUTH_LEAVING);
2063
2064                 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) ||
2065                     ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
2066                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2067                 else if (ifmgd->flags & IEEE80211_STA_EXT_SME)
2068                         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2069                 queue_work(local->hw.workqueue, &ifmgd->work);
2070         }
2071 }
2072
2073 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
2074 {
2075         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2076
2077         if (ifmgd->ssid_len)
2078                 ifmgd->flags |= IEEE80211_STA_SSID_SET;
2079         else
2080                 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
2081
2082         return 0;
2083 }
2084
2085 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2086 {
2087         struct ieee80211_if_managed *ifmgd;
2088
2089         if (len > IEEE80211_MAX_SSID_LEN)
2090                 return -EINVAL;
2091
2092         ifmgd = &sdata->u.mgd;
2093
2094         if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
2095                 /*
2096                  * Do not use reassociation if SSID is changed (different ESS).
2097                  */
2098                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2099                 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
2100                 memcpy(ifmgd->ssid, ssid, len);
2101                 ifmgd->ssid_len = len;
2102         }
2103
2104         return ieee80211_sta_commit(sdata);
2105 }
2106
2107 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2108 {
2109         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2110         memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
2111         *len = ifmgd->ssid_len;
2112         return 0;
2113 }
2114
2115 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2116 {
2117         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2118
2119         if (is_valid_ether_addr(bssid)) {
2120                 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
2121                 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
2122         } else {
2123                 memset(ifmgd->bssid, 0, ETH_ALEN);
2124                 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
2125         }
2126
2127         if (netif_running(sdata->dev)) {
2128                 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
2129                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2130                                "the low-level driver\n", sdata->dev->name);
2131                 }
2132         }
2133
2134         return ieee80211_sta_commit(sdata);
2135 }
2136
2137 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
2138                                const char *ie, size_t len)
2139 {
2140         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2141
2142         kfree(ifmgd->extra_ie);
2143         if (len == 0) {
2144                 ifmgd->extra_ie = NULL;
2145                 ifmgd->extra_ie_len = 0;
2146                 return 0;
2147         }
2148         ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
2149         if (!ifmgd->extra_ie) {
2150                 ifmgd->extra_ie_len = 0;
2151                 return -ENOMEM;
2152         }
2153         memcpy(ifmgd->extra_ie, ie, len);
2154         ifmgd->extra_ie_len = len;
2155         return 0;
2156 }
2157
2158 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2159 {
2160         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2161                sdata->dev->name, reason);
2162
2163         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2164                 return -EINVAL;
2165
2166         ieee80211_set_disassoc(sdata, true, true, reason);
2167         return 0;
2168 }
2169
2170 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2171 {
2172         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2173
2174         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2175                sdata->dev->name, reason);
2176
2177         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2178                 return -EINVAL;
2179
2180         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
2181                 return -ENOLINK;
2182
2183         ieee80211_set_disassoc(sdata, false, true, reason);
2184         return 0;
2185 }
2186
2187 /* scan finished notification */
2188 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2189 {
2190         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2191
2192         /* Restart STA timers */
2193         rcu_read_lock();
2194         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2195                 ieee80211_restart_sta_timer(sdata);
2196         rcu_read_unlock();
2197 }
2198
2199 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2200 {
2201         struct ieee80211_local *local =
2202                 container_of(work, struct ieee80211_local,
2203                              dynamic_ps_disable_work);
2204
2205         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2206                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2207                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2208         }
2209
2210         ieee80211_wake_queues_by_reason(&local->hw,
2211                                         IEEE80211_QUEUE_STOP_REASON_PS);
2212 }
2213
2214 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2215 {
2216         struct ieee80211_local *local =
2217                 container_of(work, struct ieee80211_local,
2218                              dynamic_ps_enable_work);
2219         /* XXX: using scan_sdata is completely broken! */
2220         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2221
2222         if (local->hw.conf.flags & IEEE80211_CONF_PS)
2223                 return;
2224
2225         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK && sdata)
2226                 ieee80211_send_nullfunc(local, sdata, 1);
2227
2228         local->hw.conf.flags |= IEEE80211_CONF_PS;
2229         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2230 }
2231
2232 void ieee80211_dynamic_ps_timer(unsigned long data)
2233 {
2234         struct ieee80211_local *local = (void *) data;
2235
2236         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2237 }
2238
2239 void ieee80211_send_nullfunc(struct ieee80211_local *local,
2240                              struct ieee80211_sub_if_data *sdata,
2241                              int powersave)
2242 {
2243         struct sk_buff *skb;
2244         struct ieee80211_hdr *nullfunc;
2245         __le16 fc;
2246
2247         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2248                 return;
2249
2250         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
2251         if (!skb) {
2252                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2253                        "frame\n", sdata->dev->name);
2254                 return;
2255         }
2256         skb_reserve(skb, local->hw.extra_tx_headroom);
2257
2258         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
2259         memset(nullfunc, 0, 24);
2260         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
2261                          IEEE80211_FCTL_TODS);
2262         if (powersave)
2263                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
2264         nullfunc->frame_control = fc;
2265         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2266         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
2267         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2268
2269         ieee80211_tx_skb(sdata, skb, 0);
2270 }