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

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/wireless.h>
  19 #include <linux/random.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <net/iw_handler.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "rate.h"
  28 #include "led.h"
  29
  30 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
  31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  32 #define IEEE80211_AUTH_MAX_TRIES 3
  33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  34 #define IEEE80211_ASSOC_MAX_TRIES 3
  35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  36 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
  37 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  38 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  39 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
  40 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  41
  42 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  43 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  44
  45 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  46
  47
  48 /* utils */
  49 static int ecw2cw(int ecw)
  50 {
  51         return (1 << ecw) - 1;
  52 }
  53
  54 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  55 {
  56         u8 *end, *pos;
  57
  58         pos = bss->ies;
  59         if (pos == NULL)
  60                 return NULL;
  61         end = pos + bss->ies_len;
  62
  63         while (pos + 1 < end) {
  64                 if (pos + 2 + pos[1] > end)
  65                         break;
  66                 if (pos[0] == ie)
  67                         return pos;
  68                 pos += 2 + pos[1];
  69         }
  70
  71         return NULL;
  72 }
  73
  74 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  75                                       struct ieee80211_supported_band *sband,
  76                                       u32 *rates)
  77 {
  78         int i, j, count;
  79         *rates = 0;
  80         count = 0;
  81         for (i = 0; i < bss->supp_rates_len; i++) {
  82                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  83
  84                 for (j = 0; j < sband->n_bitrates; j++)
  85                         if (sband->bitrates[j].bitrate == rate) {
  86                                 *rates |= BIT(j);
  87                                 count++;
  88                                 break;
  89                         }
  90         }
  91
  92         return count;
  93 }
  94
  95 /* also used by mesh code */
  96 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
  97                             struct ieee802_11_elems *elems,
  98                             enum ieee80211_band band)
  99 {
 100         struct ieee80211_supported_band *sband;
 101         struct ieee80211_rate *bitrates;
 102         size_t num_rates;
 103         u32 supp_rates;
 104         int i, j;
 105         sband = local->hw.wiphy->bands[band];
 106
 107         if (!sband) {
 108                 WARN_ON(1);
 109                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 110         }
 111
 112         bitrates = sband->bitrates;
 113         num_rates = sband->n_bitrates;
 114         supp_rates = 0;
 115         for (i = 0; i < elems->supp_rates_len +
 116                      elems->ext_supp_rates_len; i++) {
 117                 u8 rate = 0;
 118                 int own_rate;
 119                 if (i < elems->supp_rates_len)
 120                         rate = elems->supp_rates[i];
 121                 else if (elems->ext_supp_rates)
 122                         rate = elems->ext_supp_rates
 123                                 [i - elems->supp_rates_len];
 124                 own_rate = 5 * (rate & 0x7f);
 125                 for (j = 0; j < num_rates; j++)
 126                         if (bitrates[j].bitrate == own_rate)
 127                                 supp_rates |= BIT(j);
 128         }
 129         return supp_rates;
 130 }
 131
 132 /* frame sending functions */
 133
 134 static void add_extra_ies(struct sk_buff *skb, u8 *ies, size_t ies_len)
 135 {
 136         if (ies)
 137                 memcpy(skb_put(skb, ies_len), ies, ies_len);
 138 }
 139
 140 /* also used by scanning code */
 141 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 142                               u8 *ssid, size_t ssid_len)
 143 {
 144         struct ieee80211_local *local = sdata->local;
 145         struct ieee80211_supported_band *sband;
 146         struct sk_buff *skb;
 147         struct ieee80211_mgmt *mgmt;
 148         u8 *pos, *supp_rates, *esupp_rates = NULL;
 149         int i;
 150
 151         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
 152                             sdata->u.sta.ie_probereq_len);
 153         if (!skb) {
 154                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 155                        "request\n", sdata->dev->name);
 156                 return;
 157         }
 158         skb_reserve(skb, local->hw.extra_tx_headroom);
 159
 160         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 161         memset(mgmt, 0, 24);
 162         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 163                                           IEEE80211_STYPE_PROBE_REQ);
 164         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 165         if (dst) {
 166                 memcpy(mgmt->da, dst, ETH_ALEN);
 167                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 168         } else {
 169                 memset(mgmt->da, 0xff, ETH_ALEN);
 170                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 171         }
 172         pos = skb_put(skb, 2 + ssid_len);
 173         *pos++ = WLAN_EID_SSID;
 174         *pos++ = ssid_len;
 175         memcpy(pos, ssid, ssid_len);
 176
 177         supp_rates = skb_put(skb, 2);
 178         supp_rates[0] = WLAN_EID_SUPP_RATES;
 179         supp_rates[1] = 0;
 180         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 181
 182         for (i = 0; i < sband->n_bitrates; i++) {
 183                 struct ieee80211_rate *rate = &sband->bitrates[i];
 184                 if (esupp_rates) {
 185                         pos = skb_put(skb, 1);
 186                         esupp_rates[1]++;
 187                 } else if (supp_rates[1] == 8) {
 188                         esupp_rates = skb_put(skb, 3);
 189                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 190                         esupp_rates[1] = 1;
 191                         pos = &esupp_rates[2];
 192                 } else {
 193                         pos = skb_put(skb, 1);
 194                         supp_rates[1]++;
 195                 }
 196                 *pos = rate->bitrate / 5;
 197         }
 198
 199         add_extra_ies(skb, sdata->u.sta.ie_probereq,
 200                       sdata->u.sta.ie_probereq_len);
 201
 202         ieee80211_tx_skb(sdata, skb, 0);
 203 }
 204
 205 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 206                                 struct ieee80211_if_sta *ifsta,
 207                                 int transaction, u8 *extra, size_t extra_len,
 208                                 int encrypt)
 209 {
 210         struct ieee80211_local *local = sdata->local;
 211         struct sk_buff *skb;
 212         struct ieee80211_mgmt *mgmt;
 213
 214         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 215                             sizeof(*mgmt) + 6 + extra_len +
 216                             sdata->u.sta.ie_auth_len);
 217         if (!skb) {
 218                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 219                        "frame\n", sdata->dev->name);
 220                 return;
 221         }
 222         skb_reserve(skb, local->hw.extra_tx_headroom);
 223
 224         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 225         memset(mgmt, 0, 24 + 6);
 226         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 227                                           IEEE80211_STYPE_AUTH);
 228         if (encrypt)
 229                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 230         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 231         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 232         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 233         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
 234         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 235         ifsta->auth_transaction = transaction + 1;
 236         mgmt->u.auth.status_code = cpu_to_le16(0);
 237         if (extra)
 238                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 239         add_extra_ies(skb, sdata->u.sta.ie_auth, sdata->u.sta.ie_auth_len);
 240
 241         ieee80211_tx_skb(sdata, skb, encrypt);
 242 }
 243
 244 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
 245                                  struct ieee80211_if_sta *ifsta)
 246 {
 247         struct ieee80211_local *local = sdata->local;
 248         struct sk_buff *skb;
 249         struct ieee80211_mgmt *mgmt;
 250         u8 *pos, *ies, *ht_ie, *e_ies;
 251         int i, len, count, rates_len, supp_rates_len;
 252         u16 capab;
 253         struct ieee80211_bss *bss;
 254         int wmm = 0;
 255         struct ieee80211_supported_band *sband;
 256         u32 rates = 0;
 257         size_t e_ies_len;
 258
 259         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 260                 e_ies = sdata->u.sta.ie_reassocreq;
 261                 e_ies_len = sdata->u.sta.ie_reassocreq_len;
 262         } else {
 263                 e_ies = sdata->u.sta.ie_assocreq;
 264                 e_ies_len = sdata->u.sta.ie_assocreq_len;
 265         }
 266
 267         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 268                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
 269                             ifsta->ssid_len + e_ies_len);
 270         if (!skb) {
 271                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 272                        "frame\n", sdata->dev->name);
 273                 return;
 274         }
 275         skb_reserve(skb, local->hw.extra_tx_headroom);
 276
 277         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 278
 279         capab = ifsta->capab;
 280
 281         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 282                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 283                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 284                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 285                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 286         }
 287
 288         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 289                                    local->hw.conf.channel->center_freq,
 290                                    ifsta->ssid, ifsta->ssid_len);
 291         if (bss) {
 292                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 293                         capab |= WLAN_CAPABILITY_PRIVACY;
 294                 if (bss->wmm_used)
 295                         wmm = 1;
 296
 297                 /* get all rates supported by the device and the AP as
 298                  * some APs don't like getting a superset of their rates
 299                  * in the association request (e.g. D-Link DAP 1353 in
 300                  * b-only mode) */
 301                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 302
 303                 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 304                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 305                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 306
 307                 ieee80211_rx_bss_put(local, bss);
 308         } else {
 309                 rates = ~0;
 310                 rates_len = sband->n_bitrates;
 311         }
 312
 313         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 314         memset(mgmt, 0, 24);
 315         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 316         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 317         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 318
 319         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 320                 skb_put(skb, 10);
 321                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 322                                                   IEEE80211_STYPE_REASSOC_REQ);
 323                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 324                 mgmt->u.reassoc_req.listen_interval =
 325                                 cpu_to_le16(local->hw.conf.listen_interval);
 326                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
 327                        ETH_ALEN);
 328         } else {
 329                 skb_put(skb, 4);
 330                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 331                                                   IEEE80211_STYPE_ASSOC_REQ);
 332                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 333                 mgmt->u.assoc_req.listen_interval =
 334                                 cpu_to_le16(local->hw.conf.listen_interval);
 335         }
 336
 337         /* SSID */
 338         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
 339         *pos++ = WLAN_EID_SSID;
 340         *pos++ = ifsta->ssid_len;
 341         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
 342
 343         /* add all rates which were marked to be used above */
 344         supp_rates_len = rates_len;
 345         if (supp_rates_len > 8)
 346                 supp_rates_len = 8;
 347
 348         len = sband->n_bitrates;
 349         pos = skb_put(skb, supp_rates_len + 2);
 350         *pos++ = WLAN_EID_SUPP_RATES;
 351         *pos++ = supp_rates_len;
 352
 353         count = 0;
 354         for (i = 0; i < sband->n_bitrates; i++) {
 355                 if (BIT(i) & rates) {
 356                         int rate = sband->bitrates[i].bitrate;
 357                         *pos++ = (u8) (rate / 5);
 358                         if (++count == 8)
 359                                 break;
 360                 }
 361         }
 362
 363         if (rates_len > count) {
 364                 pos = skb_put(skb, rates_len - count + 2);
 365                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 366                 *pos++ = rates_len - count;
 367
 368                 for (i++; i < sband->n_bitrates; i++) {
 369                         if (BIT(i) & rates) {
 370                                 int rate = sband->bitrates[i].bitrate;
 371                                 *pos++ = (u8) (rate / 5);
 372                         }
 373                 }
 374         }
 375
 376         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 377                 /* 1. power capabilities */
 378                 pos = skb_put(skb, 4);
 379                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 380                 *pos++ = 2;
 381                 *pos++ = 0; /* min tx power */
 382                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 383
 384                 /* 2. supported channels */
 385                 /* TODO: get this in reg domain format */
 386                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 387                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 388                 *pos++ = 2 * sband->n_channels;
 389                 for (i = 0; i < sband->n_channels; i++) {
 390                         *pos++ = ieee80211_frequency_to_channel(
 391                                         sband->channels[i].center_freq);
 392                         *pos++ = 1; /* one channel in the subband*/
 393                 }
 394         }
 395
 396         if (ifsta->extra_ie) {
 397                 pos = skb_put(skb, ifsta->extra_ie_len);
 398                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
 399         }
 400
 401         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
 402                 pos = skb_put(skb, 9);
 403                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 404                 *pos++ = 7; /* len */
 405                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 406                 *pos++ = 0x50;
 407                 *pos++ = 0xf2;
 408                 *pos++ = 2; /* WME */
 409                 *pos++ = 0; /* WME info */
 410                 *pos++ = 1; /* WME ver */
 411                 *pos++ = 0;
 412         }
 413
 414         /* wmm support is a must to HT */
 415         /*
 416          * IEEE802.11n does not allow TKIP/WEP as pairwise
 417          * ciphers in HT mode. We still associate in non-ht
 418          * mode (11a/b/g) if any one of these ciphers is
 419          * configured as pairwise.
 420          */
 421         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
 422             sband->ht_cap.ht_supported &&
 423             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
 424             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 425             (!(ifsta->flags & IEEE80211_STA_TKIP_WEP_USED))) {
 426                 struct ieee80211_ht_info *ht_info =
 427                         (struct ieee80211_ht_info *)(ht_ie + 2);
 428                 u16 cap = sband->ht_cap.cap;
 429                 __le16 tmp;
 430                 u32 flags = local->hw.conf.channel->flags;
 431
 432                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 433                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 434                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 435                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 436                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 437                         }
 438                         break;
 439                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 440                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 441                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 442                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 443                         }
 444                         break;
 445                 }
 446
 447                 tmp = cpu_to_le16(cap);
 448                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 449                 *pos++ = WLAN_EID_HT_CAPABILITY;
 450                 *pos++ = sizeof(struct ieee80211_ht_cap);
 451                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 452                 memcpy(pos, &tmp, sizeof(u16));
 453                 pos += sizeof(u16);
 454                 /* TODO: needs a define here for << 2 */
 455                 *pos++ = sband->ht_cap.ampdu_factor |
 456                          (sband->ht_cap.ampdu_density << 2);
 457                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 458         }
 459
 460         add_extra_ies(skb, e_ies, e_ies_len);
 461
 462         kfree(ifsta->assocreq_ies);
 463         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
 464         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
 465         if (ifsta->assocreq_ies)
 466                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
 467
 468         ieee80211_tx_skb(sdata, skb, 0);
 469 }
 470
 471
 472 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 473                                            u16 stype, u16 reason)
 474 {
 475         struct ieee80211_local *local = sdata->local;
 476         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 477         struct sk_buff *skb;
 478         struct ieee80211_mgmt *mgmt;
 479         u8 *ies;
 480         size_t ies_len;
 481
 482         if (stype == IEEE80211_STYPE_DEAUTH) {
 483                 ies = sdata->u.sta.ie_deauth;
 484                 ies_len = sdata->u.sta.ie_deauth_len;
 485         } else {
 486                 ies = sdata->u.sta.ie_disassoc;
 487                 ies_len = sdata->u.sta.ie_disassoc_len;
 488         }
 489
 490         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) +
 491                             ies_len);
 492         if (!skb) {
 493                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 494                        "deauth/disassoc frame\n", sdata->dev->name);
 495                 return;
 496         }
 497         skb_reserve(skb, local->hw.extra_tx_headroom);
 498
 499         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 500         memset(mgmt, 0, 24);
 501         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 502         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 503         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 504         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 505         skb_put(skb, 2);
 506         /* u.deauth.reason_code == u.disassoc.reason_code */
 507         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 508
 509         add_extra_ies(skb, ies, ies_len);
 510
 511         ieee80211_tx_skb(sdata, skb, ifsta->flags & IEEE80211_STA_MFP_ENABLED);
 512 }
 513
 514 /* MLME */
 515 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 516                                          struct ieee80211_bss *bss)
 517 {
 518         struct ieee80211_local *local = sdata->local;
 519         int i, have_higher_than_11mbit = 0;
 520
 521         /* cf. IEEE 802.11 9.2.12 */
 522         for (i = 0; i < bss->supp_rates_len; i++)
 523                 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
 524                         have_higher_than_11mbit = 1;
 525
 526         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 527             have_higher_than_11mbit)
 528                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 529         else
 530                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 531
 532         ieee80211_set_wmm_default(sdata);
 533 }
 534
 535 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 536                                      struct ieee80211_if_sta *ifsta,
 537                                      u8 *wmm_param, size_t wmm_param_len)
 538 {
 539         struct ieee80211_tx_queue_params params;
 540         size_t left;
 541         int count;
 542         u8 *pos;
 543
 544         if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
 545                 return;
 546
 547         if (!wmm_param)
 548                 return;
 549
 550         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 551                 return;
 552         count = wmm_param[6] & 0x0f;
 553         if (count == ifsta->wmm_last_param_set)
 554                 return;
 555         ifsta->wmm_last_param_set = count;
 556
 557         pos = wmm_param + 8;
 558         left = wmm_param_len - 8;
 559
 560         memset(&params, 0, sizeof(params));
 561
 562         if (!local->ops->conf_tx)
 563                 return;
 564
 565         local->wmm_acm = 0;
 566         for (; left >= 4; left -= 4, pos += 4) {
 567                 int aci = (pos[0] >> 5) & 0x03;
 568                 int acm = (pos[0] >> 4) & 0x01;
 569                 int queue;
 570
 571                 switch (aci) {
 572                 case 1:
 573                         queue = 3;
 574                         if (acm)
 575                                 local->wmm_acm |= BIT(0) | BIT(3);
 576                         break;
 577                 case 2:
 578                         queue = 1;
 579                         if (acm)
 580                                 local->wmm_acm |= BIT(4) | BIT(5);
 581                         break;
 582                 case 3:
 583                         queue = 0;
 584                         if (acm)
 585                                 local->wmm_acm |= BIT(6) | BIT(7);
 586                         break;
 587                 case 0:
 588                 default:
 589                         queue = 2;
 590                         if (acm)
 591                                 local->wmm_acm |= BIT(1) | BIT(2);
 592                         break;
 593                 }
 594
 595                 params.aifs = pos[0] & 0x0f;
 596                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 597                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 598                 params.txop = get_unaligned_le16(pos + 2);
 599 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 600                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 601                        "cWmin=%d cWmax=%d txop=%d\n",
 602                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 603                        params.cw_max, params.txop);
 604 #endif
 605                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
 606                  * AC for now) */
 607                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 608                         printk(KERN_DEBUG "%s: failed to set TX queue "
 609                                "parameters for queue %d\n", local->mdev->name, queue);
 610                 }
 611         }
 612 }
 613
 614 static bool check_tim(struct ieee802_11_elems *elems, u16 aid, bool *is_mc)
 615 {
 616         u8 mask;
 617         u8 index, indexn1, indexn2;
 618         struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
 619
 620         aid &= 0x3fff;
 621         index = aid / 8;
 622         mask  = 1 << (aid & 7);
 623
 624         if (tim->bitmap_ctrl & 0x01)
 625                 *is_mc = true;
 626
 627         indexn1 = tim->bitmap_ctrl & 0xfe;
 628         indexn2 = elems->tim_len + indexn1 - 4;
 629
 630         if (index < indexn1 || index > indexn2)
 631                 return false;
 632
 633         index -= indexn1;
 634
 635         return !!(tim->virtual_map[index] & mask);
 636 }
 637
 638 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 639                                            u16 capab, bool erp_valid, u8 erp)
 640 {
 641         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 642 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 643         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 644 #endif
 645         u32 changed = 0;
 646         bool use_protection;
 647         bool use_short_preamble;
 648         bool use_short_slot;
 649
 650         if (erp_valid) {
 651                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 652                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 653         } else {
 654                 use_protection = false;
 655                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 656         }
 657
 658         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 659
 660         if (use_protection != bss_conf->use_cts_prot) {
 661 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 662                 if (net_ratelimit()) {
 663                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 664                                sdata->dev->name,
 665                                use_protection ? "enabled" : "disabled",
 666                                ifsta->bssid);
 667                 }
 668 #endif
 669                 bss_conf->use_cts_prot = use_protection;
 670                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 671         }
 672
 673         if (use_short_preamble != bss_conf->use_short_preamble) {
 674 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 675                 if (net_ratelimit()) {
 676                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 677                                " (BSSID=%pM)\n",
 678                                sdata->dev->name,
 679                                use_short_preamble ? "short" : "long",
 680                                ifsta->bssid);
 681                 }
 682 #endif
 683                 bss_conf->use_short_preamble = use_short_preamble;
 684                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 685         }
 686
 687         if (use_short_slot != bss_conf->use_short_slot) {
 688 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 689                 if (net_ratelimit()) {
 690                         printk(KERN_DEBUG "%s: switched to %s slot time"
 691                                " (BSSID=%pM)\n",
 692                                sdata->dev->name,
 693                                use_short_slot ? "short" : "long",
 694                                ifsta->bssid);
 695                 }
 696 #endif
 697                 bss_conf->use_short_slot = use_short_slot;
 698                 changed |= BSS_CHANGED_ERP_SLOT;
 699         }
 700
 701         return changed;
 702 }
 703
 704 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
 705                                         struct ieee80211_if_sta *ifsta)
 706 {
 707         union iwreq_data wrqu;
 708         memset(&wrqu, 0, sizeof(wrqu));
 709         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
 710                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
 711         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 712         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 713 }
 714
 715 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
 716                                          struct ieee80211_if_sta *ifsta)
 717 {
 718         char *buf;
 719         size_t len;
 720         int i;
 721         union iwreq_data wrqu;
 722
 723         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
 724                 return;
 725
 726         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
 727                                 ifsta->assocresp_ies_len), GFP_KERNEL);
 728         if (!buf)
 729                 return;
 730
 731         len = sprintf(buf, "ASSOCINFO(");
 732         if (ifsta->assocreq_ies) {
 733                 len += sprintf(buf + len, "ReqIEs=");
 734                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
 735                         len += sprintf(buf + len, "%02x",
 736                                        ifsta->assocreq_ies[i]);
 737                 }
 738         }
 739         if (ifsta->assocresp_ies) {
 740                 if (ifsta->assocreq_ies)
 741                         len += sprintf(buf + len, " ");
 742                 len += sprintf(buf + len, "RespIEs=");
 743                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 744                         len += sprintf(buf + len, "%02x",
 745                                        ifsta->assocresp_ies[i]);
 746                 }
 747         }
 748         len += sprintf(buf + len, ")");
 749
 750         if (len > IW_CUSTOM_MAX) {
 751                 len = sprintf(buf, "ASSOCRESPIE=");
 752                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 753                         len += sprintf(buf + len, "%02x",
 754                                        ifsta->assocresp_ies[i]);
 755                 }
 756         }
 757
 758         if (len <= IW_CUSTOM_MAX) {
 759                 memset(&wrqu, 0, sizeof(wrqu));
 760                 wrqu.data.length = len;
 761                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 762         }
 763
 764         kfree(buf);
 765 }
 766
 767
 768 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 769                                      struct ieee80211_if_sta *ifsta,
 770                                      u32 bss_info_changed)
 771 {
 772         struct ieee80211_local *local = sdata->local;
 773         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 774
 775         struct ieee80211_bss *bss;
 776
 777         bss_info_changed |= BSS_CHANGED_ASSOC;
 778         ifsta->flags |= IEEE80211_STA_ASSOCIATED;
 779
 780         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 781                 return;
 782
 783         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 784                                    conf->channel->center_freq,
 785                                    ifsta->ssid, ifsta->ssid_len);
 786         if (bss) {
 787                 /* set timing information */
 788                 sdata->vif.bss_conf.beacon_int = bss->beacon_int;
 789                 sdata->vif.bss_conf.timestamp = bss->timestamp;
 790                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 791
 792                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 793                         bss->capability, bss->has_erp_value, bss->erp_value);
 794
 795                 ieee80211_rx_bss_put(local, bss);
 796         }
 797
 798         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
 799         memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 800         ieee80211_sta_send_associnfo(sdata, ifsta);
 801
 802         ifsta->last_probe = jiffies;
 803         ieee80211_led_assoc(local, 1);
 804
 805         sdata->vif.bss_conf.assoc = 1;
 806         /*
 807          * For now just always ask the driver to update the basic rateset
 808          * when we have associated, we aren't checking whether it actually
 809          * changed or not.
 810          */
 811         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 812         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 813
 814         if (local->powersave) {
 815                 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
 816                     local->hw.conf.dynamic_ps_timeout > 0) {
 817                         mod_timer(&local->dynamic_ps_timer, jiffies +
 818                                   msecs_to_jiffies(
 819                                         local->hw.conf.dynamic_ps_timeout));
 820                 } else {
 821                         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 822                                 ieee80211_send_nullfunc(local, sdata, 1);
 823                         conf->flags |= IEEE80211_CONF_PS;
 824                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 825                 }
 826         }
 827
 828         netif_tx_start_all_queues(sdata->dev);
 829         netif_carrier_on(sdata->dev);
 830
 831         ieee80211_sta_send_apinfo(sdata, ifsta);
 832 }
 833
 834 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
 835                                    struct ieee80211_if_sta *ifsta)
 836 {
 837         ifsta->direct_probe_tries++;
 838         if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 839                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 840                        sdata->dev->name, ifsta->bssid);
 841                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 842                 ieee80211_sta_send_apinfo(sdata, ifsta);
 843                 return;
 844         }
 845
 846         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 847                         sdata->dev->name, ifsta->bssid,
 848                         ifsta->direct_probe_tries);
 849
 850         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 851
 852         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
 853
 854         /* Direct probe is sent to broadcast address as some APs
 855          * will not answer to direct packet in unassociated state.
 856          */
 857         ieee80211_send_probe_req(sdata, NULL,
 858                                  ifsta->ssid, ifsta->ssid_len);
 859
 860         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 861 }
 862
 863
 864 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
 865                                    struct ieee80211_if_sta *ifsta)
 866 {
 867         ifsta->auth_tries++;
 868         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 869                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 870                        " timed out\n",
 871                        sdata->dev->name, ifsta->bssid);
 872                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 873                 ieee80211_sta_send_apinfo(sdata, ifsta);
 874                 return;
 875         }
 876
 877         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
 878         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 879                sdata->dev->name, ifsta->bssid);
 880
 881         ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
 882
 883         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 884 }
 885
 886 /*
 887  * The disassoc 'reason' argument can be either our own reason
 888  * if self disconnected or a reason code from the AP.
 889  */
 890 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 891                                    struct ieee80211_if_sta *ifsta, bool deauth,
 892                                    bool self_disconnected, u16 reason)
 893 {
 894         struct ieee80211_local *local = sdata->local;
 895         struct sta_info *sta;
 896         u32 changed = 0, config_changed = 0;
 897
 898         rcu_read_lock();
 899
 900         sta = sta_info_get(local, ifsta->bssid);
 901         if (!sta) {
 902                 rcu_read_unlock();
 903                 return;
 904         }
 905
 906         if (deauth) {
 907                 ifsta->direct_probe_tries = 0;
 908                 ifsta->auth_tries = 0;
 909         }
 910         ifsta->assoc_scan_tries = 0;
 911         ifsta->assoc_tries = 0;
 912
 913         netif_tx_stop_all_queues(sdata->dev);
 914         netif_carrier_off(sdata->dev);
 915
 916         ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
 917
 918         if (self_disconnected) {
 919                 if (deauth)
 920                         ieee80211_send_deauth_disassoc(sdata,
 921                                 IEEE80211_STYPE_DEAUTH, reason);
 922                 else
 923                         ieee80211_send_deauth_disassoc(sdata,
 924                                 IEEE80211_STYPE_DISASSOC, reason);
 925         }
 926
 927         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
 928         changed |= ieee80211_reset_erp_info(sdata);
 929
 930         ieee80211_led_assoc(local, 0);
 931         changed |= BSS_CHANGED_ASSOC;
 932         sdata->vif.bss_conf.assoc = false;
 933
 934         ieee80211_sta_send_apinfo(sdata, ifsta);
 935
 936         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT)
 937                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 938
 939         rcu_read_unlock();
 940
 941         /* channel(_type) changes are handled by ieee80211_hw_config */
 942         local->oper_channel_type = NL80211_CHAN_NO_HT;
 943
 944         local->power_constr_level = 0;
 945
 946         del_timer_sync(&local->dynamic_ps_timer);
 947         cancel_work_sync(&local->dynamic_ps_enable_work);
 948
 949         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 950                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 951                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 952         }
 953
 954         ieee80211_hw_config(local, config_changed);
 955         ieee80211_bss_info_change_notify(sdata, changed);
 956
 957         rcu_read_lock();
 958
 959         sta = sta_info_get(local, ifsta->bssid);
 960         if (!sta) {
 961                 rcu_read_unlock();
 962                 return;
 963         }
 964
 965         sta_info_unlink(&sta);
 966
 967         rcu_read_unlock();
 968
 969         sta_info_destroy(sta);
 970 }
 971
 972 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
 973 {
 974         if (!sdata || !sdata->default_key ||
 975             sdata->default_key->conf.alg != ALG_WEP)
 976                 return 0;
 977         return 1;
 978 }
 979
 980 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
 981                                       struct ieee80211_if_sta *ifsta)
 982 {
 983         struct ieee80211_local *local = sdata->local;
 984         struct ieee80211_bss *bss;
 985         int bss_privacy;
 986         int wep_privacy;
 987         int privacy_invoked;
 988
 989         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
 990                 return 0;
 991
 992         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 993                                    local->hw.conf.channel->center_freq,
 994                                    ifsta->ssid, ifsta->ssid_len);
 995         if (!bss)
 996                 return 0;
 997
 998         bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
 999         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1000         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
1001
1002         ieee80211_rx_bss_put(local, bss);
1003
1004         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1005                 return 0;
1006
1007         return 1;
1008 }
1009
1010 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1011                                 struct ieee80211_if_sta *ifsta)
1012 {
1013         ifsta->assoc_tries++;
1014         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1015                 printk(KERN_DEBUG "%s: association with AP %pM"
1016                        " timed out\n",
1017                        sdata->dev->name, ifsta->bssid);
1018                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1019                 ieee80211_sta_send_apinfo(sdata, ifsta);
1020                 return;
1021         }
1022
1023         ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1024         printk(KERN_DEBUG "%s: associate with AP %pM\n",
1025                sdata->dev->name, ifsta->bssid);
1026         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
1027                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1028                        "mixed-cell disabled - abort association\n", sdata->dev->name);
1029                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1030                 return;
1031         }
1032
1033         ieee80211_send_assoc(sdata, ifsta);
1034
1035         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1036 }
1037
1038
1039 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1040                                  struct ieee80211_if_sta *ifsta)
1041 {
1042         struct ieee80211_local *local = sdata->local;
1043         struct sta_info *sta;
1044         int disassoc;
1045
1046         /* TODO: start monitoring current AP signal quality and number of
1047          * missed beacons. Scan other channels every now and then and search
1048          * for better APs. */
1049         /* TODO: remove expired BSSes */
1050
1051         ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1052
1053         rcu_read_lock();
1054
1055         sta = sta_info_get(local, ifsta->bssid);
1056         if (!sta) {
1057                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1058                        sdata->dev->name, ifsta->bssid);
1059                 disassoc = 1;
1060         } else {
1061                 disassoc = 0;
1062                 if (time_after(jiffies,
1063                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1064                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1065                                 printk(KERN_DEBUG "%s: No ProbeResp from "
1066                                        "current AP %pM - assume out of "
1067                                        "range\n",
1068                                        sdata->dev->name, ifsta->bssid);
1069                                 disassoc = 1;
1070                         } else
1071                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1072                                                          ifsta->ssid,
1073                                                          ifsta->ssid_len);
1074                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1075                 } else {
1076                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1077                         if (time_after(jiffies, ifsta->last_probe +
1078                                        IEEE80211_PROBE_INTERVAL)) {
1079                                 ifsta->last_probe = jiffies;
1080                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1081                                                          ifsta->ssid,
1082                                                          ifsta->ssid_len);
1083                         }
1084                 }
1085         }
1086
1087         rcu_read_unlock();
1088
1089         if (disassoc)
1090                 ieee80211_set_disassoc(sdata, ifsta, true, true,
1091                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1092         else
1093                 mod_timer(&ifsta->timer, jiffies +
1094                                       IEEE80211_MONITORING_INTERVAL);
1095 }
1096
1097
1098 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1099                                      struct ieee80211_if_sta *ifsta)
1100 {
1101         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1102         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1103         ieee80211_associate(sdata, ifsta);
1104 }
1105
1106
1107 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1108                                      struct ieee80211_if_sta *ifsta,
1109                                      struct ieee80211_mgmt *mgmt,
1110                                      size_t len)
1111 {
1112         u8 *pos;
1113         struct ieee802_11_elems elems;
1114
1115         pos = mgmt->u.auth.variable;
1116         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1117         if (!elems.challenge)
1118                 return;
1119         ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1120                             elems.challenge_len + 2, 1);
1121 }
1122
1123 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1124                                    struct ieee80211_if_sta *ifsta,
1125                                    struct ieee80211_mgmt *mgmt,
1126                                    size_t len)
1127 {
1128         u16 auth_alg, auth_transaction, status_code;
1129
1130         if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1131             sdata->vif.type != NL80211_IFTYPE_ADHOC)
1132                 return;
1133
1134         if (len < 24 + 6)
1135                 return;
1136
1137         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1138             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1139                 return;
1140
1141         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1142             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1143                 return;
1144
1145         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1146         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1147         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1148
1149         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1150                 /*
1151                  * IEEE 802.11 standard does not require authentication in IBSS
1152                  * networks and most implementations do not seem to use it.
1153                  * However, try to reply to authentication attempts if someone
1154                  * has actually implemented this.
1155                  */
1156                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1157                         return;
1158                 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1159         }
1160
1161         if (auth_alg != ifsta->auth_alg ||
1162             auth_transaction != ifsta->auth_transaction)
1163                 return;
1164
1165         if (status_code != WLAN_STATUS_SUCCESS) {
1166                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1167                         u8 algs[3];
1168                         const int num_algs = ARRAY_SIZE(algs);
1169                         int i, pos;
1170                         algs[0] = algs[1] = algs[2] = 0xff;
1171                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1172                                 algs[0] = WLAN_AUTH_OPEN;
1173                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1174                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1175                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1176                                 algs[2] = WLAN_AUTH_LEAP;
1177                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1178                                 pos = 0;
1179                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1180                                 pos = 1;
1181                         else
1182                                 pos = 2;
1183                         for (i = 0; i < num_algs; i++) {
1184                                 pos++;
1185                                 if (pos >= num_algs)
1186                                         pos = 0;
1187                                 if (algs[pos] == ifsta->auth_alg ||
1188                                     algs[pos] == 0xff)
1189                                         continue;
1190                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1191                                     !ieee80211_sta_wep_configured(sdata))
1192                                         continue;
1193                                 ifsta->auth_alg = algs[pos];
1194                                 break;
1195                         }
1196                 }
1197                 return;
1198         }
1199
1200         switch (ifsta->auth_alg) {
1201         case WLAN_AUTH_OPEN:
1202         case WLAN_AUTH_LEAP:
1203                 ieee80211_auth_completed(sdata, ifsta);
1204                 break;
1205         case WLAN_AUTH_SHARED_KEY:
1206                 if (ifsta->auth_transaction == 4)
1207                         ieee80211_auth_completed(sdata, ifsta);
1208                 else
1209                         ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1210                 break;
1211         }
1212 }
1213
1214
1215 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1216                                      struct ieee80211_if_sta *ifsta,
1217                                      struct ieee80211_mgmt *mgmt,
1218                                      size_t len)
1219 {
1220         u16 reason_code;
1221
1222         if (len < 24 + 2)
1223                 return;
1224
1225         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1226                 return;
1227
1228         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1229
1230         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1231                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1232                                 sdata->dev->name, reason_code);
1233
1234         if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1235             ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1236             ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1237                 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1238                 mod_timer(&ifsta->timer, jiffies +
1239                                       IEEE80211_RETRY_AUTH_INTERVAL);
1240         }
1241
1242         ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1243         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1244 }
1245
1246
1247 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1248                                        struct ieee80211_if_sta *ifsta,
1249                                        struct ieee80211_mgmt *mgmt,
1250                                        size_t len)
1251 {
1252         u16 reason_code;
1253
1254         if (len < 24 + 2)
1255                 return;
1256
1257         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1258                 return;
1259
1260         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1261
1262         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1263                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1264                                 sdata->dev->name, reason_code);
1265
1266         if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1267                 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1268                 mod_timer(&ifsta->timer, jiffies +
1269                                       IEEE80211_RETRY_AUTH_INTERVAL);
1270         }
1271
1272         ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1273 }
1274
1275
1276 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1277                                          struct ieee80211_if_sta *ifsta,
1278                                          struct ieee80211_mgmt *mgmt,
1279                                          size_t len,
1280                                          int reassoc)
1281 {
1282         struct ieee80211_local *local = sdata->local;
1283         struct ieee80211_supported_band *sband;
1284         struct sta_info *sta;
1285         u32 rates, basic_rates;
1286         u16 capab_info, status_code, aid;
1287         struct ieee802_11_elems elems;
1288         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1289         u8 *pos;
1290         u32 changed = 0;
1291         int i, j;
1292         bool have_higher_than_11mbit = false, newsta = false;
1293         u16 ap_ht_cap_flags;
1294
1295         /* AssocResp and ReassocResp have identical structure, so process both
1296          * of them in this function. */
1297
1298         if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1299                 return;
1300
1301         if (len < 24 + 6)
1302                 return;
1303
1304         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1305                 return;
1306
1307         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1308         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1309         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1310
1311         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1312                "status=%d aid=%d)\n",
1313                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1314                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1315
1316         pos = mgmt->u.assoc_resp.variable;
1317         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1318
1319         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1320             elems.timeout_int && elems.timeout_int_len == 5 &&
1321             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1322                 u32 tu, ms;
1323                 tu = get_unaligned_le32(elems.timeout_int + 1);
1324                 ms = tu * 1024 / 1000;
1325                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1326                        "comeback duration %u TU (%u ms)\n",
1327                        sdata->dev->name, tu, ms);
1328                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1329                         mod_timer(&ifsta->timer,
1330                                   jiffies + msecs_to_jiffies(ms));
1331                 return;
1332         }
1333
1334         if (status_code != WLAN_STATUS_SUCCESS) {
1335                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1336                        sdata->dev->name, status_code);
1337                 /* if this was a reassociation, ensure we try a "full"
1338                  * association next time. This works around some broken APs
1339                  * which do not correctly reject reassociation requests. */
1340                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1341                 return;
1342         }
1343
1344         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1345                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1346                        "set\n", sdata->dev->name, aid);
1347         aid &= ~(BIT(15) | BIT(14));
1348
1349         if (!elems.supp_rates) {
1350                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1351                        sdata->dev->name);
1352                 return;
1353         }
1354
1355         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1356         ifsta->aid = aid;
1357         ifsta->ap_capab = capab_info;
1358
1359         kfree(ifsta->assocresp_ies);
1360         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1361         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1362         if (ifsta->assocresp_ies)
1363                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1364
1365         rcu_read_lock();
1366
1367         /* Add STA entry for the AP */
1368         sta = sta_info_get(local, ifsta->bssid);
1369         if (!sta) {
1370                 struct ieee80211_bss *bss;
1371
1372                 newsta = true;
1373
1374                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1375                 if (!sta) {
1376                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1377                                " the AP\n", sdata->dev->name);
1378                         rcu_read_unlock();
1379                         return;
1380                 }
1381                 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1382                                            local->hw.conf.channel->center_freq,
1383                                            ifsta->ssid, ifsta->ssid_len);
1384                 if (bss) {
1385                         sta->last_signal = bss->signal;
1386                         sta->last_qual = bss->qual;
1387                         sta->last_noise = bss->noise;
1388                         ieee80211_rx_bss_put(local, bss);
1389                 }
1390
1391                 /* update new sta with its last rx activity */
1392                 sta->last_rx = jiffies;
1393         }
1394
1395         /*
1396          * FIXME: Do we really need to update the sta_info's information here?
1397          *        We already know about the AP (we found it in our list) so it
1398          *        should already be filled with the right info, no?
1399          *        As is stands, all this is racy because typically we assume
1400          *        the information that is filled in here (except flags) doesn't
1401          *        change while a STA structure is alive. As such, it should move
1402          *        to between the sta_info_alloc() and sta_info_insert() above.
1403          */
1404
1405         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1406                            WLAN_STA_AUTHORIZED);
1407
1408         rates = 0;
1409         basic_rates = 0;
1410         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1411
1412         for (i = 0; i < elems.supp_rates_len; i++) {
1413                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1414                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1415
1416                 if (rate > 110)
1417                         have_higher_than_11mbit = true;
1418
1419                 for (j = 0; j < sband->n_bitrates; j++) {
1420                         if (sband->bitrates[j].bitrate == rate) {
1421                                 rates |= BIT(j);
1422                                 if (is_basic)
1423                                         basic_rates |= BIT(j);
1424                                 break;
1425                         }
1426                 }
1427         }
1428
1429         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1430                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1431                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1432
1433                 if (rate > 110)
1434                         have_higher_than_11mbit = true;
1435
1436                 for (j = 0; j < sband->n_bitrates; j++) {
1437                         if (sband->bitrates[j].bitrate == rate) {
1438                                 rates |= BIT(j);
1439                                 if (is_basic)
1440                                         basic_rates |= BIT(j);
1441                                 break;
1442                         }
1443                 }
1444         }
1445
1446         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1447         sdata->vif.bss_conf.basic_rates = basic_rates;
1448
1449         /* cf. IEEE 802.11 9.2.12 */
1450         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1451             have_higher_than_11mbit)
1452                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1453         else
1454                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1455
1456         if (elems.ht_cap_elem)
1457                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1458                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1459
1460         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1461
1462         rate_control_rate_init(sta);
1463
1464         if (ifsta->flags & IEEE80211_STA_MFP_ENABLED)
1465                 set_sta_flags(sta, WLAN_STA_MFP);
1466
1467         if (elems.wmm_param)
1468                 set_sta_flags(sta, WLAN_STA_WME);
1469
1470         if (newsta) {
1471                 int err = sta_info_insert(sta);
1472                 if (err) {
1473                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1474                                " the AP (error %d)\n", sdata->dev->name, err);
1475                         rcu_read_unlock();
1476                         return;
1477                 }
1478         }
1479
1480         rcu_read_unlock();
1481
1482         if (elems.wmm_param)
1483                 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1484                                          elems.wmm_param_len);
1485
1486         if (elems.ht_info_elem && elems.wmm_param &&
1487             (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1488                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1489                                                ap_ht_cap_flags);
1490
1491         /* set AID and assoc capability,
1492          * ieee80211_set_associated() will tell the driver */
1493         bss_conf->aid = aid;
1494         bss_conf->assoc_capability = capab_info;
1495         ieee80211_set_associated(sdata, ifsta, changed);
1496
1497         ieee80211_associated(sdata, ifsta);
1498 }
1499
1500
1501 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1502                                    struct ieee80211_if_sta *ifsta,
1503                                    struct ieee80211_bss *bss)
1504 {
1505         struct ieee80211_local *local = sdata->local;
1506         int res, rates, i, j;
1507         struct sk_buff *skb;
1508         struct ieee80211_mgmt *mgmt;
1509         u8 *pos;
1510         struct ieee80211_supported_band *sband;
1511         union iwreq_data wrqu;
1512
1513         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400 +
1514                             sdata->u.sta.ie_proberesp_len);
1515         if (!skb) {
1516                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1517                        "response\n", sdata->dev->name);
1518                 return -ENOMEM;
1519         }
1520
1521         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1522
1523         /* Remove possible STA entries from other IBSS networks. */
1524         sta_info_flush_delayed(sdata);
1525
1526         if (local->ops->reset_tsf) {
1527                 /* Reset own TSF to allow time synchronization work. */
1528                 local->ops->reset_tsf(local_to_hw(local));
1529         }
1530         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1531         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1532         if (res)
1533                 return res;
1534
1535         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1536
1537         sdata->drop_unencrypted = bss->capability &
1538                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1539
1540         res = ieee80211_set_freq(sdata, bss->freq);
1541
1542         if (res)
1543                 return res;
1544
1545         /* Build IBSS probe response */
1546
1547         skb_reserve(skb, local->hw.extra_tx_headroom);
1548
1549         mgmt = (struct ieee80211_mgmt *)
1550                 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1551         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1552         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1553                                                 IEEE80211_STYPE_PROBE_RESP);
1554         memset(mgmt->da, 0xff, ETH_ALEN);
1555         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1556         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1557         mgmt->u.beacon.beacon_int =
1558                 cpu_to_le16(local->hw.conf.beacon_int);
1559         mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1560         mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1561
1562         pos = skb_put(skb, 2 + ifsta->ssid_len);
1563         *pos++ = WLAN_EID_SSID;
1564         *pos++ = ifsta->ssid_len;
1565         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1566
1567         rates = bss->supp_rates_len;
1568         if (rates > 8)
1569                 rates = 8;
1570         pos = skb_put(skb, 2 + rates);
1571         *pos++ = WLAN_EID_SUPP_RATES;
1572         *pos++ = rates;
1573         memcpy(pos, bss->supp_rates, rates);
1574
1575         if (bss->band == IEEE80211_BAND_2GHZ) {
1576                 pos = skb_put(skb, 2 + 1);
1577                 *pos++ = WLAN_EID_DS_PARAMS;
1578                 *pos++ = 1;
1579                 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1580         }
1581
1582         pos = skb_put(skb, 2 + 2);
1583         *pos++ = WLAN_EID_IBSS_PARAMS;
1584         *pos++ = 2;
1585         /* FIX: set ATIM window based on scan results */
1586         *pos++ = 0;
1587         *pos++ = 0;
1588
1589         if (bss->supp_rates_len > 8) {
1590                 rates = bss->supp_rates_len - 8;
1591                 pos = skb_put(skb, 2 + rates);
1592                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1593                 *pos++ = rates;
1594                 memcpy(pos, &bss->supp_rates[8], rates);
1595         }
1596
1597         add_extra_ies(skb, sdata->u.sta.ie_proberesp,
1598                       sdata->u.sta.ie_proberesp_len);
1599
1600         ifsta->probe_resp = skb;
1601
1602         ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON |
1603                                    IEEE80211_IFCC_BEACON_ENABLED);
1604
1605
1606         rates = 0;
1607         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1608         for (i = 0; i < bss->supp_rates_len; i++) {
1609                 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1610                 for (j = 0; j < sband->n_bitrates; j++)
1611                         if (sband->bitrates[j].bitrate == bitrate)
1612                                 rates |= BIT(j);
1613         }
1614         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1615
1616         ieee80211_sta_def_wmm_params(sdata, bss);
1617
1618         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
1619         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1620         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1621
1622         ieee80211_led_assoc(local, true);
1623
1624         memset(&wrqu, 0, sizeof(wrqu));
1625         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1626         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1627
1628         return res;
1629 }
1630
1631 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1632                                   struct ieee80211_mgmt *mgmt,
1633                                   size_t len,
1634                                   struct ieee80211_rx_status *rx_status,
1635                                   struct ieee802_11_elems *elems,
1636                                   bool beacon)
1637 {
1638         struct ieee80211_local *local = sdata->local;
1639         int freq;
1640         struct ieee80211_bss *bss;
1641         struct sta_info *sta;
1642         struct ieee80211_channel *channel;
1643         u64 beacon_timestamp, rx_timestamp;
1644         u32 supp_rates = 0;
1645         enum ieee80211_band band = rx_status->band;
1646
1647         if (elems->ds_params && elems->ds_params_len == 1)
1648                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1649         else
1650                 freq = rx_status->freq;
1651
1652         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1653
1654         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1655                 return;
1656
1657         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1658             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1659                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1660
1661                 rcu_read_lock();
1662
1663                 sta = sta_info_get(local, mgmt->sa);
1664                 if (sta) {
1665                         u32 prev_rates;
1666
1667                         prev_rates = sta->sta.supp_rates[band];
1668                         /* make sure mandatory rates are always added */
1669                         sta->sta.supp_rates[band] = supp_rates |
1670                                 ieee80211_mandatory_rates(local, band);
1671
1672 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1673                         if (sta->sta.supp_rates[band] != prev_rates)
1674                                 printk(KERN_DEBUG "%s: updated supp_rates set "
1675                                     "for %pM based on beacon info (0x%llx | "
1676                                     "0x%llx -> 0x%llx)\n",
1677                                     sdata->dev->name,
1678                                     sta->sta.addr,
1679                                     (unsigned long long) prev_rates,
1680                                     (unsigned long long) supp_rates,
1681                                     (unsigned long long) sta->sta.supp_rates[band]);
1682 #endif
1683                 } else {
1684                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1685                 }
1686
1687                 rcu_read_unlock();
1688         }
1689
1690         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1691                                         freq, beacon);
1692         if (!bss)
1693                 return;
1694
1695         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1696             (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
1697                 struct ieee80211_channel_sw_ie *sw_elem =
1698                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1699                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1700         }
1701
1702         /* was just updated in ieee80211_bss_info_update */
1703         beacon_timestamp = bss->timestamp;
1704
1705         /*
1706          * In STA mode, the remaining parameters should not be overridden
1707          * by beacons because they're not necessarily accurate there.
1708          */
1709         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1710             bss->last_probe_resp && beacon) {
1711                 ieee80211_rx_bss_put(local, bss);
1712                 return;
1713         }
1714
1715         /* check if we need to merge IBSS */
1716         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1717             (!(sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)) &&
1718             bss->capability & WLAN_CAPABILITY_IBSS &&
1719             bss->freq == local->oper_channel->center_freq &&
1720             elems->ssid_len == sdata->u.sta.ssid_len &&
1721             memcmp(elems->ssid, sdata->u.sta.ssid,
1722                                 sdata->u.sta.ssid_len) == 0) {
1723                 if (rx_status->flag & RX_FLAG_TSFT) {
1724                         /* in order for correct IBSS merging we need mactime
1725                          *
1726                          * since mactime is defined as the time the first data
1727                          * symbol of the frame hits the PHY, and the timestamp
1728                          * of the beacon is defined as "the time that the data
1729                          * symbol containing the first bit of the timestamp is
1730                          * transmitted to the PHY plus the transmitting STA’s
1731                          * delays through its local PHY from the MAC-PHY
1732                          * interface to its interface with the WM"
1733                          * (802.11 11.1.2) - equals the time this bit arrives at
1734                          * the receiver - we have to take into account the
1735                          * offset between the two.
1736                          * e.g: at 1 MBit that means mactime is 192 usec earlier
1737                          * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1738                          */
1739                         int rate;
1740                         if (rx_status->flag & RX_FLAG_HT) {
1741                                 rate = 65; /* TODO: HT rates */
1742                         } else {
1743                                 rate = local->hw.wiphy->bands[band]->
1744                                         bitrates[rx_status->rate_idx].bitrate;
1745                         }
1746                         rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1747                 } else if (local && local->ops && local->ops->get_tsf)
1748                         /* second best option: get current TSF */
1749                         rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1750                 else
1751                         /* can't merge without knowing the TSF */
1752                         rx_timestamp = -1LLU;
1753 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1754                 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1755                        "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1756                        mgmt->sa, mgmt->bssid,
1757                        (unsigned long long)rx_timestamp,
1758                        (unsigned long long)beacon_timestamp,
1759                        (unsigned long long)(rx_timestamp - beacon_timestamp),
1760                        jiffies);
1761 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1762                 if (beacon_timestamp > rx_timestamp) {
1763 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1764                         printk(KERN_DEBUG "%s: beacon TSF higher than "
1765                                "local TSF - IBSS merge with BSSID %pM\n",
1766                                sdata->dev->name, mgmt->bssid);
1767 #endif
1768                         ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1769                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1770                 }
1771         }
1772
1773         ieee80211_rx_bss_put(local, bss);
1774 }
1775
1776
1777 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1778                                          struct ieee80211_mgmt *mgmt,
1779                                          size_t len,
1780                                          struct ieee80211_rx_status *rx_status)
1781 {
1782         size_t baselen;
1783         struct ieee802_11_elems elems;
1784         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1785
1786         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1787                 return; /* ignore ProbeResp to foreign address */
1788
1789         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1790         if (baselen > len)
1791                 return;
1792
1793         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1794                                 &elems);
1795
1796         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1797
1798         /* direct probe may be part of the association flow */
1799         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1800                                                         &ifsta->request)) {
1801                 printk(KERN_DEBUG "%s direct probe responded\n",
1802                        sdata->dev->name);
1803                 ieee80211_authenticate(sdata, ifsta);
1804         }
1805 }
1806
1807
1808 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1809                                      struct ieee80211_mgmt *mgmt,
1810                                      size_t len,
1811                                      struct ieee80211_rx_status *rx_status)
1812 {
1813         struct ieee80211_if_sta *ifsta;
1814         size_t baselen;
1815         struct ieee802_11_elems elems;
1816         struct ieee80211_local *local = sdata->local;
1817         u32 changed = 0;
1818         bool erp_valid, directed_tim, is_mc = false;
1819         u8 erp_value = 0;
1820
1821         /* Process beacon from the current BSS */
1822         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1823         if (baselen > len)
1824                 return;
1825
1826         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1827
1828         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1829
1830         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1831                 return;
1832         ifsta = &sdata->u.sta;
1833
1834         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1835             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1836                 return;
1837
1838         if (rx_status->freq != local->hw.conf.channel->center_freq)
1839                 return;
1840
1841         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1842                                  elems.wmm_param_len);
1843
1844         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK &&
1845             local->hw.conf.flags & IEEE80211_CONF_PS) {
1846                 directed_tim = check_tim(&elems, ifsta->aid, &is_mc);
1847
1848                 if (directed_tim || is_mc) {
1849                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1850                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1851                         ieee80211_send_nullfunc(local, sdata, 0);
1852                 }
1853         }
1854
1855         if (elems.erp_info && elems.erp_info_len >= 1) {
1856                 erp_valid = true;
1857                 erp_value = elems.erp_info[0];
1858         } else {
1859                 erp_valid = false;
1860         }
1861         changed |= ieee80211_handle_bss_capability(sdata,
1862                         le16_to_cpu(mgmt->u.beacon.capab_info),
1863                         erp_valid, erp_value);
1864
1865
1866         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1867                 struct sta_info *sta;
1868                 struct ieee80211_supported_band *sband;
1869                 u16 ap_ht_cap_flags;
1870
1871                 rcu_read_lock();
1872
1873                 sta = sta_info_get(local, ifsta->bssid);
1874                 if (!sta) {
1875                         rcu_read_unlock();
1876                         return;
1877                 }
1878
1879                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1880
1881                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1882                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1883
1884                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1885
1886                 rcu_read_unlock();
1887
1888                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1889                                                ap_ht_cap_flags);
1890         }
1891
1892         if (elems.country_elem) {
1893                 /* Note we are only reviewing this on beacons
1894                  * for the BSSID we are associated to */
1895                 regulatory_hint_11d(local->hw.wiphy,
1896                         elems.country_elem, elems.country_elem_len);
1897
1898                 /* TODO: IBSS also needs this */
1899                 if (elems.pwr_constr_elem)
1900                         ieee80211_handle_pwr_constr(sdata,
1901                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1902                                 elems.pwr_constr_elem,
1903                                 elems.pwr_constr_elem_len);
1904         }
1905
1906         ieee80211_bss_info_change_notify(sdata, changed);
1907 }
1908
1909
1910 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1911                                         struct ieee80211_if_sta *ifsta,
1912                                         struct ieee80211_mgmt *mgmt,
1913                                         size_t len)
1914 {
1915         struct ieee80211_local *local = sdata->local;
1916         int tx_last_beacon;
1917         struct sk_buff *skb;
1918         struct ieee80211_mgmt *resp;
1919         u8 *pos, *end;
1920
1921         if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1922             ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1923             len < 24 + 2 || !ifsta->probe_resp)
1924                 return;
1925
1926         if (local->ops->tx_last_beacon)
1927                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1928         else
1929                 tx_last_beacon = 1;
1930
1931 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1932         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1933                " (tx_last_beacon=%d)\n",
1934                sdata->dev->name, mgmt->sa, mgmt->da,
1935                mgmt->bssid, tx_last_beacon);
1936 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1937
1938         if (!tx_last_beacon)
1939                 return;
1940
1941         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1942             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1943                 return;
1944
1945         end = ((u8 *) mgmt) + len;
1946         pos = mgmt->u.probe_req.variable;
1947         if (pos[0] != WLAN_EID_SSID ||
1948             pos + 2 + pos[1] > end) {
1949 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1950                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1951                        "from %pM\n",
1952                        sdata->dev->name, mgmt->sa);
1953 #endif
1954                 return;
1955         }
1956         if (pos[1] != 0 &&
1957             (pos[1] != ifsta->ssid_len ||
1958              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1959                 /* Ignore ProbeReq for foreign SSID */
1960                 return;
1961         }
1962
1963         /* Reply with ProbeResp */
1964         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1965         if (!skb)
1966                 return;
1967
1968         resp = (struct ieee80211_mgmt *) skb->data;
1969         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1970 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1971         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1972                sdata->dev->name, resp->da);
1973 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1974         ieee80211_tx_skb(sdata, skb, 0);
1975 }
1976
1977 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1978                            struct ieee80211_rx_status *rx_status)
1979 {
1980         struct ieee80211_local *local = sdata->local;
1981         struct ieee80211_if_sta *ifsta;
1982         struct ieee80211_mgmt *mgmt;
1983         u16 fc;
1984
1985         if (skb->len < 24)
1986                 goto fail;
1987
1988         ifsta = &sdata->u.sta;
1989
1990         mgmt = (struct ieee80211_mgmt *) skb->data;
1991         fc = le16_to_cpu(mgmt->frame_control);
1992
1993         switch (fc & IEEE80211_FCTL_STYPE) {
1994         case IEEE80211_STYPE_PROBE_REQ:
1995         case IEEE80211_STYPE_PROBE_RESP:
1996         case IEEE80211_STYPE_BEACON:
1997                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1998         case IEEE80211_STYPE_AUTH:
1999         case IEEE80211_STYPE_ASSOC_RESP:
2000         case IEEE80211_STYPE_REASSOC_RESP:
2001         case IEEE80211_STYPE_DEAUTH:
2002         case IEEE80211_STYPE_DISASSOC:
2003                 skb_queue_tail(&ifsta->skb_queue, skb);
2004                 queue_work(local->hw.workqueue, &ifsta->work);
2005                 return;
2006         }
2007
2008  fail:
2009         kfree_skb(skb);
2010 }
2011
2012 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2013                                          struct sk_buff *skb)
2014 {
2015         struct ieee80211_rx_status *rx_status;
2016         struct ieee80211_if_sta *ifsta;
2017         struct ieee80211_mgmt *mgmt;
2018         u16 fc;
2019
2020         ifsta = &sdata->u.sta;
2021
2022         rx_status = (struct ieee80211_rx_status *) skb->cb;
2023         mgmt = (struct ieee80211_mgmt *) skb->data;
2024         fc = le16_to_cpu(mgmt->frame_control);
2025
2026         switch (fc & IEEE80211_FCTL_STYPE) {
2027         case IEEE80211_STYPE_PROBE_REQ:
2028                 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len);
2029                 break;
2030         case IEEE80211_STYPE_PROBE_RESP:
2031                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
2032                 break;
2033         case IEEE80211_STYPE_BEACON:
2034                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2035                 break;
2036         case IEEE80211_STYPE_AUTH:
2037                 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
2038                 break;
2039         case IEEE80211_STYPE_ASSOC_RESP:
2040                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
2041                 break;
2042         case IEEE80211_STYPE_REASSOC_RESP:
2043                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
2044                 break;
2045         case IEEE80211_STYPE_DEAUTH:
2046                 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
2047                 break;
2048         case IEEE80211_STYPE_DISASSOC:
2049                 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
2050                 break;
2051         }
2052
2053         kfree_skb(skb);
2054 }
2055
2056
2057 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
2058 {
2059         struct ieee80211_local *local = sdata->local;
2060         int active = 0;
2061         struct sta_info *sta;
2062
2063         rcu_read_lock();
2064
2065         list_for_each_entry_rcu(sta, &local->sta_list, list) {
2066                 if (sta->sdata == sdata &&
2067                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
2068                                jiffies)) {
2069                         active++;
2070                         break;
2071                 }
2072         }
2073
2074         rcu_read_unlock();
2075
2076         return active;
2077 }
2078
2079
2080 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
2081                                      struct ieee80211_if_sta *ifsta)
2082 {
2083         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2084
2085         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
2086         if (ieee80211_sta_active_ibss(sdata))
2087                 return;
2088
2089         if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
2090             (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
2091                 return;
2092
2093         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2094                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
2095         ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
2096 }
2097
2098
2099 static void ieee80211_sta_timer(unsigned long data)
2100 {
2101         struct ieee80211_sub_if_data *sdata =
2102                 (struct ieee80211_sub_if_data *) data;
2103         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2104         struct ieee80211_local *local = sdata->local;
2105
2106         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2107         queue_work(local->hw.workqueue, &ifsta->work);
2108 }
2109
2110 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
2111                                      struct ieee80211_if_sta *ifsta)
2112 {
2113         struct ieee80211_local *local = sdata->local;
2114
2115         if (local->ops->reset_tsf) {
2116                 /* Reset own TSF to allow time synchronization work. */
2117                 local->ops->reset_tsf(local_to_hw(local));
2118         }
2119
2120         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2121
2122
2123         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2124                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2125         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2126                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2127         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2128                 ifsta->auth_alg = WLAN_AUTH_LEAP;
2129         else
2130                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2131         ifsta->auth_transaction = -1;
2132         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2133         ifsta->assoc_scan_tries = 0;
2134         ifsta->direct_probe_tries = 0;
2135         ifsta->auth_tries = 0;
2136         ifsta->assoc_tries = 0;
2137         netif_tx_stop_all_queues(sdata->dev);
2138         netif_carrier_off(sdata->dev);
2139 }
2140
2141
2142 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2143                                     const char *ssid, int ssid_len)
2144 {
2145         int tmp, hidden_ssid;
2146
2147         if (ssid_len == ifsta->ssid_len &&
2148             !memcmp(ifsta->ssid, ssid, ssid_len))
2149                 return 1;
2150
2151         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2152                 return 0;
2153
2154         hidden_ssid = 1;
2155         tmp = ssid_len;
2156         while (tmp--) {
2157                 if (ssid[tmp] != '\0') {
2158                         hidden_ssid = 0;
2159                         break;
2160                 }
2161         }
2162
2163         if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
2164                 return 1;
2165
2166         if (ssid_len == 1 && ssid[0] == ' ')
2167                 return 1;
2168
2169         return 0;
2170 }
2171
2172 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2173                                      struct ieee80211_if_sta *ifsta)
2174 {
2175         struct ieee80211_local *local = sdata->local;
2176         struct ieee80211_bss *bss;
2177         struct ieee80211_supported_band *sband;
2178         u8 bssid[ETH_ALEN], *pos;
2179         int i;
2180         int ret;
2181
2182         if (sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) {
2183                 memcpy(bssid, ifsta->bssid, ETH_ALEN);
2184         } else {
2185                 /* Generate random, not broadcast, locally administered BSSID. Mix in
2186                  * own MAC address to make sure that devices that do not have proper
2187                  * random number generator get different BSSID. */
2188                 get_random_bytes(bssid, ETH_ALEN);
2189                 for (i = 0; i < ETH_ALEN; i++)
2190                         bssid[i] ^= sdata->dev->dev_addr[i];
2191                 bssid[0] &= ~0x01;
2192                 bssid[0] |= 0x02;
2193         }
2194
2195         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2196                sdata->dev->name, bssid);
2197
2198         bss = ieee80211_rx_bss_add(local, bssid,
2199                                    local->hw.conf.channel->center_freq,
2200                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2201         if (!bss)
2202                 return -ENOMEM;
2203
2204         bss->band = local->hw.conf.channel->band;
2205         sband = local->hw.wiphy->bands[bss->band];
2206
2207         if (local->hw.conf.beacon_int == 0)
2208                 local->hw.conf.beacon_int = 100;
2209         bss->beacon_int = local->hw.conf.beacon_int;
2210         bss->last_update = jiffies;
2211         bss->capability = WLAN_CAPABILITY_IBSS;
2212
2213         if (sdata->default_key)
2214                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2215         else
2216                 sdata->drop_unencrypted = 0;
2217
2218         bss->supp_rates_len = sband->n_bitrates;
2219         pos = bss->supp_rates;
2220         for (i = 0; i < sband->n_bitrates; i++) {
2221                 int rate = sband->bitrates[i].bitrate;
2222                 *pos++ = (u8) (rate / 5);
2223         }
2224
2225         ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2226         ieee80211_rx_bss_put(local, bss);
2227         return ret;
2228 }
2229
2230
2231 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2232                                    struct ieee80211_if_sta *ifsta)
2233 {
2234         struct ieee80211_local *local = sdata->local;
2235         struct ieee80211_bss *bss;
2236         int found = 0;
2237         u8 bssid[ETH_ALEN];
2238         int active_ibss;
2239
2240         if (ifsta->ssid_len == 0)
2241                 return -EINVAL;
2242
2243         active_ibss = ieee80211_sta_active_ibss(sdata);
2244 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2245         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2246                sdata->dev->name, active_ibss);
2247 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2248         spin_lock_bh(&local->bss_lock);
2249         list_for_each_entry(bss, &local->bss_list, list) {
2250                 if (ifsta->ssid_len != bss->ssid_len ||
2251                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2252                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2253                         continue;
2254                 if ((ifsta->flags & IEEE80211_STA_BSSID_SET) &&
2255                     memcmp(ifsta->bssid, bss->bssid, ETH_ALEN) != 0)
2256                         continue;
2257 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2258                 printk(KERN_DEBUG "   bssid=%pM found\n", bss->bssid);
2259 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2260                 memcpy(bssid, bss->bssid, ETH_ALEN);
2261                 found = 1;
2262                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2263                         break;
2264         }
2265         spin_unlock_bh(&local->bss_lock);
2266
2267 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2268         if (found)
2269                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
2270                        "%pM\n", bssid, ifsta->bssid);
2271 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2272
2273         if (found &&
2274             ((!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) ||
2275              memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0)) {
2276                 int ret;
2277                 int search_freq;
2278
2279                 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2280                         search_freq = bss->freq;
2281                 else
2282                         search_freq = local->hw.conf.channel->center_freq;
2283
2284                 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2285                                            ifsta->ssid, ifsta->ssid_len);
2286                 if (!bss)
2287                         goto dont_join;
2288
2289                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2290                        " based on configured SSID\n",
2291                        sdata->dev->name, bssid);
2292                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2293                 ieee80211_rx_bss_put(local, bss);
2294                 return ret;
2295         }
2296
2297 dont_join:
2298 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2299         printk(KERN_DEBUG "   did not try to join ibss\n");
2300 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2301
2302         /* Selected IBSS not found in current scan results - try to scan */
2303         if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2304             !ieee80211_sta_active_ibss(sdata)) {
2305                 mod_timer(&ifsta->timer, jiffies +
2306                                       IEEE80211_IBSS_MERGE_INTERVAL);
2307         } else if (time_after(jiffies, local->last_scan_completed +
2308                               IEEE80211_SCAN_INTERVAL)) {
2309                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2310                        "join\n", sdata->dev->name);
2311                 return ieee80211_request_scan(sdata, ifsta->ssid,
2312                                               ifsta->ssid_len);
2313         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2314                 int interval = IEEE80211_SCAN_INTERVAL;
2315
2316                 if (time_after(jiffies, ifsta->ibss_join_req +
2317                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2318                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2319                             (!(local->oper_channel->flags &
2320                                         IEEE80211_CHAN_NO_IBSS)))
2321                                 return ieee80211_sta_create_ibss(sdata, ifsta);
2322                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2323                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
2324                                        " %d MHz\n", sdata->dev->name,
2325                                        local->hw.conf.channel->center_freq);
2326                         }
2327
2328                         /* No IBSS found - decrease scan interval and continue
2329                          * scanning. */
2330                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2331                 }
2332
2333                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2334                 mod_timer(&ifsta->timer, jiffies + interval);
2335                 return 0;
2336         }
2337
2338         return 0;
2339 }
2340
2341
2342 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2343                                      struct ieee80211_if_sta *ifsta)
2344 {
2345         struct ieee80211_local *local = sdata->local;
2346         struct ieee80211_bss *bss, *selected = NULL;
2347         int top_rssi = 0, freq;
2348
2349         spin_lock_bh(&local->bss_lock);
2350         freq = local->oper_channel->center_freq;
2351         list_for_each_entry(bss, &local->bss_list, list) {
2352                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2353                         continue;
2354
2355                 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2356                         IEEE80211_STA_AUTO_BSSID_SEL |
2357                         IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2358                     (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2359                      !!sdata->default_key))
2360                         continue;
2361
2362                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2363                     bss->freq != freq)
2364                         continue;
2365
2366                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2367                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2368                         continue;
2369
2370                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2371                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2372                         continue;
2373
2374                 if (!selected || top_rssi < bss->signal) {
2375                         selected = bss;
2376                         top_rssi = bss->signal;
2377                 }
2378         }
2379         if (selected)
2380                 atomic_inc(&selected->users);
2381         spin_unlock_bh(&local->bss_lock);
2382
2383         if (selected) {
2384                 ieee80211_set_freq(sdata, selected->freq);
2385                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2386                         ieee80211_sta_set_ssid(sdata, selected->ssid,
2387                                                selected->ssid_len);
2388                 ieee80211_sta_set_bssid(sdata, selected->bssid);
2389                 ieee80211_sta_def_wmm_params(sdata, selected);
2390                 if (sdata->u.sta.mfp == IEEE80211_MFP_REQUIRED)
2391                         sdata->u.sta.flags |= IEEE80211_STA_MFP_ENABLED;
2392                 else
2393                         sdata->u.sta.flags &= ~IEEE80211_STA_MFP_ENABLED;
2394
2395                 /* Send out direct probe if no probe resp was received or
2396                  * the one we have is outdated
2397                  */
2398                 if (!selected->last_probe_resp ||
2399                     time_after(jiffies, selected->last_probe_resp
2400                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2401                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2402                 else
2403                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2404
2405                 ieee80211_rx_bss_put(local, selected);
2406                 ieee80211_sta_reset_auth(sdata, ifsta);
2407                 return 0;
2408         } else {
2409                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2410                         ifsta->assoc_scan_tries++;
2411                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2412                                 ieee80211_start_scan(sdata, NULL, 0);
2413                         else
2414                                 ieee80211_start_scan(sdata, ifsta->ssid,
2415                                                          ifsta->ssid_len);
2416                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2417                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2418                 } else {
2419                         ifsta->assoc_scan_tries = 0;
2420                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
2421                 }
2422         }
2423         return -1;
2424 }
2425
2426
2427 static void ieee80211_sta_work(struct work_struct *work)
2428 {
2429         struct ieee80211_sub_if_data *sdata =
2430                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2431         struct ieee80211_local *local = sdata->local;
2432         struct ieee80211_if_sta *ifsta;
2433         struct sk_buff *skb;
2434
2435         if (!netif_running(sdata->dev))
2436                 return;
2437
2438         if (local->sw_scanning || local->hw_scanning)
2439                 return;
2440
2441         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2442                     sdata->vif.type != NL80211_IFTYPE_ADHOC))
2443                 return;
2444         ifsta = &sdata->u.sta;
2445
2446         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2447                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2448
2449         if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2450             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2451             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2452             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2453                 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2454                                      ifsta->scan_ssid_len);
2455                 return;
2456         }
2457
2458         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2459                 if (ieee80211_sta_config_auth(sdata, ifsta))
2460                         return;
2461                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2462         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2463                 return;
2464
2465         switch (ifsta->state) {
2466         case IEEE80211_STA_MLME_DISABLED:
2467                 break;
2468         case IEEE80211_STA_MLME_DIRECT_PROBE:
2469                 ieee80211_direct_probe(sdata, ifsta);
2470                 break;
2471         case IEEE80211_STA_MLME_AUTHENTICATE:
2472                 ieee80211_authenticate(sdata, ifsta);
2473                 break;
2474         case IEEE80211_STA_MLME_ASSOCIATE:
2475                 ieee80211_associate(sdata, ifsta);
2476                 break;
2477         case IEEE80211_STA_MLME_ASSOCIATED:
2478                 ieee80211_associated(sdata, ifsta);
2479                 break;
2480         case IEEE80211_STA_MLME_IBSS_SEARCH:
2481                 ieee80211_sta_find_ibss(sdata, ifsta);
2482                 break;
2483         case IEEE80211_STA_MLME_IBSS_JOINED:
2484                 ieee80211_sta_merge_ibss(sdata, ifsta);
2485                 break;
2486         default:
2487                 WARN_ON(1);
2488                 break;
2489         }
2490
2491         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2492                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2493                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2494
2495                 ieee80211_set_disassoc(sdata, ifsta, false, true,
2496                                         WLAN_REASON_UNSPECIFIED);
2497         }
2498 }
2499
2500 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2501 {
2502         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2503                 queue_work(sdata->local->hw.workqueue,
2504                            &sdata->u.sta.work);
2505 }
2506
2507 /* interface setup */
2508 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2509 {
2510         struct ieee80211_if_sta *ifsta;
2511
2512         ifsta = &sdata->u.sta;
2513         INIT_WORK(&ifsta->work, ieee80211_sta_work);
2514         INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
2515         setup_timer(&ifsta->timer, ieee80211_sta_timer,
2516                     (unsigned long) sdata);
2517         setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
2518                     (unsigned long) sdata);
2519         skb_queue_head_init(&ifsta->skb_queue);
2520
2521         ifsta->capab = WLAN_CAPABILITY_ESS;
2522         ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2523                 IEEE80211_AUTH_ALG_SHARED_KEY;
2524         ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2525                 IEEE80211_STA_AUTO_BSSID_SEL |
2526                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2527         if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2528                 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2529 }
2530
2531 /*
2532  * Add a new IBSS station, will also be called by the RX code when,
2533  * in IBSS mode, receiving a frame from a yet-unknown station, hence
2534  * must be callable in atomic context.
2535  */
2536 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2537                                         u8 *bssid,u8 *addr, u32 supp_rates)
2538 {
2539         struct ieee80211_local *local = sdata->local;
2540         struct sta_info *sta;
2541         int band = local->hw.conf.channel->band;
2542
2543         /* TODO: Could consider removing the least recently used entry and
2544          * allow new one to be added. */
2545         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2546                 if (net_ratelimit()) {
2547                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2548                                "entry %pM\n", sdata->dev->name, addr);
2549                 }
2550                 return NULL;
2551         }
2552
2553         if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2554                 return NULL;
2555
2556 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2557         printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2558                wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2559 #endif
2560
2561         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2562         if (!sta)
2563                 return NULL;
2564
2565         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2566
2567         /* make sure mandatory rates are always added */
2568         sta->sta.supp_rates[band] = supp_rates |
2569                         ieee80211_mandatory_rates(local, band);
2570
2571         rate_control_rate_init(sta);
2572
2573         if (sta_info_insert(sta))
2574                 return NULL;
2575
2576         return sta;
2577 }
2578
2579 /* configuration hooks */
2580 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2581                             struct ieee80211_if_sta *ifsta)
2582 {
2583         struct ieee80211_local *local = sdata->local;
2584
2585         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2586                 return;
2587
2588         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2589                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2590             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2591                              IEEE80211_STA_AUTO_SSID_SEL))) {
2592
2593                 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2594                         ieee80211_set_disassoc(sdata, ifsta, true, true,
2595                                                WLAN_REASON_DEAUTH_LEAVING);
2596
2597                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2598                 queue_work(local->hw.workqueue, &ifsta->work);
2599         }
2600 }
2601
2602 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2603 {
2604         struct ieee80211_if_sta *ifsta;
2605
2606         if (len > IEEE80211_MAX_SSID_LEN)
2607                 return -EINVAL;
2608
2609         ifsta = &sdata->u.sta;
2610
2611         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2612                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2613                 memcpy(ifsta->ssid, ssid, len);
2614                 ifsta->ssid_len = len;
2615         }
2616
2617         ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2618
2619         if (len)
2620                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2621         else
2622                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2623
2624         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2625                 ifsta->ibss_join_req = jiffies;
2626                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2627                 return ieee80211_sta_find_ibss(sdata, ifsta);
2628         }
2629
2630         return 0;
2631 }
2632
2633 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2634 {
2635         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2636         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2637         *len = ifsta->ssid_len;
2638         return 0;
2639 }
2640
2641 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2642 {
2643         struct ieee80211_if_sta *ifsta;
2644
2645         ifsta = &sdata->u.sta;
2646
2647         if (is_valid_ether_addr(bssid)) {
2648                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2649                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2650         } else {
2651                 memset(ifsta->bssid, 0, ETH_ALEN);
2652                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2653         }
2654
2655         if (netif_running(sdata->dev)) {
2656                 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
2657                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2658                                "the low-level driver\n", sdata->dev->name);
2659                 }
2660         }
2661
2662         return ieee80211_sta_set_ssid(sdata, ifsta->ssid, ifsta->ssid_len);
2663 }
2664
2665 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2666 {
2667         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2668
2669         kfree(ifsta->extra_ie);
2670         if (len == 0) {
2671                 ifsta->extra_ie = NULL;
2672                 ifsta->extra_ie_len = 0;
2673                 return 0;
2674         }
2675         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2676         if (!ifsta->extra_ie) {
2677                 ifsta->extra_ie_len = 0;
2678                 return -ENOMEM;
2679         }
2680         memcpy(ifsta->extra_ie, ie, len);
2681         ifsta->extra_ie_len = len;
2682         return 0;
2683 }
2684
2685 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2686 {
2687         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2688
2689         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2690                sdata->dev->name, reason);
2691
2692         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2693             sdata->vif.type != NL80211_IFTYPE_ADHOC)
2694                 return -EINVAL;
2695
2696         ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2697         return 0;
2698 }
2699
2700 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2701 {
2702         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2703
2704         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2705                sdata->dev->name, reason);
2706
2707         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2708                 return -EINVAL;
2709
2710         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2711                 return -1;
2712
2713         ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2714         return 0;
2715 }
2716
2717 /* scan finished notification */
2718 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2719 {
2720         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2721         struct ieee80211_if_sta *ifsta;
2722
2723         if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2724                 ifsta = &sdata->u.sta;
2725                 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2726                     (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2727                     !ieee80211_sta_active_ibss(sdata)))
2728                         ieee80211_sta_find_ibss(sdata, ifsta);
2729         }
2730
2731         /* Restart STA timers */
2732         rcu_read_lock();
2733         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2734                 ieee80211_restart_sta_timer(sdata);
2735         rcu_read_unlock();
2736 }
2737
2738 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2739 {
2740         struct ieee80211_local *local =
2741                 container_of(work, struct ieee80211_local,
2742                              dynamic_ps_disable_work);
2743
2744         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2745                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2746                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2747         }
2748
2749         ieee80211_wake_queues_by_reason(&local->hw,
2750                                         IEEE80211_QUEUE_STOP_REASON_PS);
2751 }
2752
2753 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2754 {
2755         struct ieee80211_local *local =
2756                 container_of(work, struct ieee80211_local,
2757                              dynamic_ps_enable_work);
2758         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2759
2760         if (local->hw.conf.flags & IEEE80211_CONF_PS)
2761                 return;
2762
2763         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2764                 ieee80211_send_nullfunc(local, sdata, 1);
2765
2766         local->hw.conf.flags |= IEEE80211_CONF_PS;
2767         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2768 }
2769
2770 void ieee80211_dynamic_ps_timer(unsigned long data)
2771 {
2772         struct ieee80211_local *local = (void *) data;
2773
2774         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2775 }