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 = 0, 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         if (local->ops->reset_tsf) {
1514                 /* Reset own TSF to allow time synchronization work. */
1515                 local->ops->reset_tsf(local_to_hw(local));
1516         }
1517
1518         if ((ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) &&
1519            memcmp(ifsta->bssid, bss->bssid, ETH_ALEN) == 0)
1520                 return res;
1521
1522         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400 +
1523                             sdata->u.sta.ie_proberesp_len);
1524         if (!skb) {
1525                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1526                        "response\n", sdata->dev->name);
1527                 return -ENOMEM;
1528         }
1529
1530         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1531
1532         if (!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) {
1533                 /* Remove possible STA entries from other IBSS networks. */
1534                 sta_info_flush_delayed(sdata);
1535         }
1536
1537         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1538         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1539         if (res)
1540                 return res;
1541
1542         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1543
1544         sdata->drop_unencrypted = bss->capability &
1545                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1546
1547         res = ieee80211_set_freq(sdata, bss->freq);
1548
1549         if (res)
1550                 return res;
1551
1552         /* Build IBSS probe response */
1553
1554         skb_reserve(skb, local->hw.extra_tx_headroom);
1555
1556         mgmt = (struct ieee80211_mgmt *)
1557                 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1558         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1559         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1560                                                 IEEE80211_STYPE_PROBE_RESP);
1561         memset(mgmt->da, 0xff, ETH_ALEN);
1562         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1563         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1564         mgmt->u.beacon.beacon_int =
1565                 cpu_to_le16(local->hw.conf.beacon_int);
1566         mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1567         mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1568
1569         pos = skb_put(skb, 2 + ifsta->ssid_len);
1570         *pos++ = WLAN_EID_SSID;
1571         *pos++ = ifsta->ssid_len;
1572         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1573
1574         rates = bss->supp_rates_len;
1575         if (rates > 8)
1576                 rates = 8;
1577         pos = skb_put(skb, 2 + rates);
1578         *pos++ = WLAN_EID_SUPP_RATES;
1579         *pos++ = rates;
1580         memcpy(pos, bss->supp_rates, rates);
1581
1582         if (bss->band == IEEE80211_BAND_2GHZ) {
1583                 pos = skb_put(skb, 2 + 1);
1584                 *pos++ = WLAN_EID_DS_PARAMS;
1585                 *pos++ = 1;
1586                 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1587         }
1588
1589         pos = skb_put(skb, 2 + 2);
1590         *pos++ = WLAN_EID_IBSS_PARAMS;
1591         *pos++ = 2;
1592         /* FIX: set ATIM window based on scan results */
1593         *pos++ = 0;
1594         *pos++ = 0;
1595
1596         if (bss->supp_rates_len > 8) {
1597                 rates = bss->supp_rates_len - 8;
1598                 pos = skb_put(skb, 2 + rates);
1599                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1600                 *pos++ = rates;
1601                 memcpy(pos, &bss->supp_rates[8], rates);
1602         }
1603
1604         add_extra_ies(skb, sdata->u.sta.ie_proberesp,
1605                       sdata->u.sta.ie_proberesp_len);
1606
1607         ifsta->probe_resp = skb;
1608
1609         ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON |
1610                                    IEEE80211_IFCC_BEACON_ENABLED);
1611
1612
1613         rates = 0;
1614         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1615         for (i = 0; i < bss->supp_rates_len; i++) {
1616                 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1617                 for (j = 0; j < sband->n_bitrates; j++)
1618                         if (sband->bitrates[j].bitrate == bitrate)
1619                                 rates |= BIT(j);
1620         }
1621         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1622
1623         ieee80211_sta_def_wmm_params(sdata, bss);
1624
1625         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
1626         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1627         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1628
1629         ieee80211_led_assoc(local, true);
1630
1631         memset(&wrqu, 0, sizeof(wrqu));
1632         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1633         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1634
1635         return res;
1636 }
1637
1638 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1639                                   struct ieee80211_mgmt *mgmt,
1640                                   size_t len,
1641                                   struct ieee80211_rx_status *rx_status,
1642                                   struct ieee802_11_elems *elems,
1643                                   bool beacon)
1644 {
1645         struct ieee80211_local *local = sdata->local;
1646         int freq;
1647         struct ieee80211_bss *bss;
1648         struct sta_info *sta;
1649         struct ieee80211_channel *channel;
1650         u64 beacon_timestamp, rx_timestamp;
1651         u32 supp_rates = 0;
1652         enum ieee80211_band band = rx_status->band;
1653
1654         if (elems->ds_params && elems->ds_params_len == 1)
1655                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1656         else
1657                 freq = rx_status->freq;
1658
1659         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1660
1661         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1662                 return;
1663
1664         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1665             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1666                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1667
1668                 rcu_read_lock();
1669
1670                 sta = sta_info_get(local, mgmt->sa);
1671                 if (sta) {
1672                         u32 prev_rates;
1673
1674                         prev_rates = sta->sta.supp_rates[band];
1675                         /* make sure mandatory rates are always added */
1676                         sta->sta.supp_rates[band] = supp_rates |
1677                                 ieee80211_mandatory_rates(local, band);
1678
1679 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1680                         if (sta->sta.supp_rates[band] != prev_rates)
1681                                 printk(KERN_DEBUG "%s: updated supp_rates set "
1682                                     "for %pM based on beacon info (0x%llx | "
1683                                     "0x%llx -> 0x%llx)\n",
1684                                     sdata->dev->name,
1685                                     sta->sta.addr,
1686                                     (unsigned long long) prev_rates,
1687                                     (unsigned long long) supp_rates,
1688                                     (unsigned long long) sta->sta.supp_rates[band]);
1689 #endif
1690                 } else {
1691                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1692                 }
1693
1694                 rcu_read_unlock();
1695         }
1696
1697         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1698                                         freq, beacon);
1699         if (!bss)
1700                 return;
1701
1702         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1703             (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
1704                 struct ieee80211_channel_sw_ie *sw_elem =
1705                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1706                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1707         }
1708
1709         /* was just updated in ieee80211_bss_info_update */
1710         beacon_timestamp = bss->timestamp;
1711
1712         /*
1713          * In STA mode, the remaining parameters should not be overridden
1714          * by beacons because they're not necessarily accurate there.
1715          */
1716         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1717             bss->last_probe_resp && beacon) {
1718                 ieee80211_rx_bss_put(local, bss);
1719                 return;
1720         }
1721
1722         /* check if we need to merge IBSS */
1723         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1724             (!(sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)) &&
1725             bss->capability & WLAN_CAPABILITY_IBSS &&
1726             bss->freq == local->oper_channel->center_freq &&
1727             elems->ssid_len == sdata->u.sta.ssid_len &&
1728             memcmp(elems->ssid, sdata->u.sta.ssid,
1729                                 sdata->u.sta.ssid_len) == 0) {
1730                 if (rx_status->flag & RX_FLAG_TSFT) {
1731                         /* in order for correct IBSS merging we need mactime
1732                          *
1733                          * since mactime is defined as the time the first data
1734                          * symbol of the frame hits the PHY, and the timestamp
1735                          * of the beacon is defined as "the time that the data
1736                          * symbol containing the first bit of the timestamp is
1737                          * transmitted to the PHY plus the transmitting STA’s
1738                          * delays through its local PHY from the MAC-PHY
1739                          * interface to its interface with the WM"
1740                          * (802.11 11.1.2) - equals the time this bit arrives at
1741                          * the receiver - we have to take into account the
1742                          * offset between the two.
1743                          * e.g: at 1 MBit that means mactime is 192 usec earlier
1744                          * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1745                          */
1746                         int rate;
1747                         if (rx_status->flag & RX_FLAG_HT) {
1748                                 rate = 65; /* TODO: HT rates */
1749                         } else {
1750                                 rate = local->hw.wiphy->bands[band]->
1751                                         bitrates[rx_status->rate_idx].bitrate;
1752                         }
1753                         rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1754                 } else if (local && local->ops && local->ops->get_tsf)
1755                         /* second best option: get current TSF */
1756                         rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1757                 else
1758                         /* can't merge without knowing the TSF */
1759                         rx_timestamp = -1LLU;
1760 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1761                 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1762                        "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1763                        mgmt->sa, mgmt->bssid,
1764                        (unsigned long long)rx_timestamp,
1765                        (unsigned long long)beacon_timestamp,
1766                        (unsigned long long)(rx_timestamp - beacon_timestamp),
1767                        jiffies);
1768 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1769                 if (beacon_timestamp > rx_timestamp) {
1770 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1771                         printk(KERN_DEBUG "%s: beacon TSF higher than "
1772                                "local TSF - IBSS merge with BSSID %pM\n",
1773                                sdata->dev->name, mgmt->bssid);
1774 #endif
1775                         ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1776                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1777                 }
1778         }
1779
1780         ieee80211_rx_bss_put(local, bss);
1781 }
1782
1783
1784 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1785                                          struct ieee80211_mgmt *mgmt,
1786                                          size_t len,
1787                                          struct ieee80211_rx_status *rx_status)
1788 {
1789         size_t baselen;
1790         struct ieee802_11_elems elems;
1791         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1792
1793         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1794                 return; /* ignore ProbeResp to foreign address */
1795
1796         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1797         if (baselen > len)
1798                 return;
1799
1800         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1801                                 &elems);
1802
1803         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1804
1805         /* direct probe may be part of the association flow */
1806         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1807                                                         &ifsta->request)) {
1808                 printk(KERN_DEBUG "%s direct probe responded\n",
1809                        sdata->dev->name);
1810                 ieee80211_authenticate(sdata, ifsta);
1811         }
1812 }
1813
1814
1815 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1816                                      struct ieee80211_mgmt *mgmt,
1817                                      size_t len,
1818                                      struct ieee80211_rx_status *rx_status)
1819 {
1820         struct ieee80211_if_sta *ifsta;
1821         size_t baselen;
1822         struct ieee802_11_elems elems;
1823         struct ieee80211_local *local = sdata->local;
1824         u32 changed = 0;
1825         bool erp_valid, directed_tim, is_mc = false;
1826         u8 erp_value = 0;
1827
1828         /* Process beacon from the current BSS */
1829         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1830         if (baselen > len)
1831                 return;
1832
1833         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1834
1835         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1836
1837         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1838                 return;
1839         ifsta = &sdata->u.sta;
1840
1841         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1842             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1843                 return;
1844
1845         if (rx_status->freq != local->hw.conf.channel->center_freq)
1846                 return;
1847
1848         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1849                                  elems.wmm_param_len);
1850
1851         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK &&
1852             local->hw.conf.flags & IEEE80211_CONF_PS) {
1853                 directed_tim = check_tim(&elems, ifsta->aid, &is_mc);
1854
1855                 if (directed_tim || is_mc) {
1856                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1857                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1858                         ieee80211_send_nullfunc(local, sdata, 0);
1859                 }
1860         }
1861
1862         if (elems.erp_info && elems.erp_info_len >= 1) {
1863                 erp_valid = true;
1864                 erp_value = elems.erp_info[0];
1865         } else {
1866                 erp_valid = false;
1867         }
1868         changed |= ieee80211_handle_bss_capability(sdata,
1869                         le16_to_cpu(mgmt->u.beacon.capab_info),
1870                         erp_valid, erp_value);
1871
1872
1873         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1874                 struct sta_info *sta;
1875                 struct ieee80211_supported_band *sband;
1876                 u16 ap_ht_cap_flags;
1877
1878                 rcu_read_lock();
1879
1880                 sta = sta_info_get(local, ifsta->bssid);
1881                 if (!sta) {
1882                         rcu_read_unlock();
1883                         return;
1884                 }
1885
1886                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1887
1888                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1889                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1890
1891                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1892
1893                 rcu_read_unlock();
1894
1895                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1896                                                ap_ht_cap_flags);
1897         }
1898
1899         if (elems.country_elem) {
1900                 /* Note we are only reviewing this on beacons
1901                  * for the BSSID we are associated to */
1902                 regulatory_hint_11d(local->hw.wiphy,
1903                         elems.country_elem, elems.country_elem_len);
1904
1905                 /* TODO: IBSS also needs this */
1906                 if (elems.pwr_constr_elem)
1907                         ieee80211_handle_pwr_constr(sdata,
1908                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1909                                 elems.pwr_constr_elem,
1910                                 elems.pwr_constr_elem_len);
1911         }
1912
1913         ieee80211_bss_info_change_notify(sdata, changed);
1914 }
1915
1916
1917 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1918                                         struct ieee80211_if_sta *ifsta,
1919                                         struct ieee80211_mgmt *mgmt,
1920                                         size_t len)
1921 {
1922         struct ieee80211_local *local = sdata->local;
1923         int tx_last_beacon;
1924         struct sk_buff *skb;
1925         struct ieee80211_mgmt *resp;
1926         u8 *pos, *end;
1927
1928         if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1929             ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1930             len < 24 + 2 || !ifsta->probe_resp)
1931                 return;
1932
1933         if (local->ops->tx_last_beacon)
1934                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1935         else
1936                 tx_last_beacon = 1;
1937
1938 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1939         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1940                " (tx_last_beacon=%d)\n",
1941                sdata->dev->name, mgmt->sa, mgmt->da,
1942                mgmt->bssid, tx_last_beacon);
1943 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1944
1945         if (!tx_last_beacon)
1946                 return;
1947
1948         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1949             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1950                 return;
1951
1952         end = ((u8 *) mgmt) + len;
1953         pos = mgmt->u.probe_req.variable;
1954         if (pos[0] != WLAN_EID_SSID ||
1955             pos + 2 + pos[1] > end) {
1956 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1957                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1958                        "from %pM\n",
1959                        sdata->dev->name, mgmt->sa);
1960 #endif
1961                 return;
1962         }
1963         if (pos[1] != 0 &&
1964             (pos[1] != ifsta->ssid_len ||
1965              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1966                 /* Ignore ProbeReq for foreign SSID */
1967                 return;
1968         }
1969
1970         /* Reply with ProbeResp */
1971         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1972         if (!skb)
1973                 return;
1974
1975         resp = (struct ieee80211_mgmt *) skb->data;
1976         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1977 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1978         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1979                sdata->dev->name, resp->da);
1980 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1981         ieee80211_tx_skb(sdata, skb, 0);
1982 }
1983
1984 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1985                            struct ieee80211_rx_status *rx_status)
1986 {
1987         struct ieee80211_local *local = sdata->local;
1988         struct ieee80211_if_sta *ifsta;
1989         struct ieee80211_mgmt *mgmt;
1990         u16 fc;
1991
1992         if (skb->len < 24)
1993                 goto fail;
1994
1995         ifsta = &sdata->u.sta;
1996
1997         mgmt = (struct ieee80211_mgmt *) skb->data;
1998         fc = le16_to_cpu(mgmt->frame_control);
1999
2000         switch (fc & IEEE80211_FCTL_STYPE) {
2001         case IEEE80211_STYPE_PROBE_REQ:
2002         case IEEE80211_STYPE_PROBE_RESP:
2003         case IEEE80211_STYPE_BEACON:
2004                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
2005         case IEEE80211_STYPE_AUTH:
2006         case IEEE80211_STYPE_ASSOC_RESP:
2007         case IEEE80211_STYPE_REASSOC_RESP:
2008         case IEEE80211_STYPE_DEAUTH:
2009         case IEEE80211_STYPE_DISASSOC:
2010                 skb_queue_tail(&ifsta->skb_queue, skb);
2011                 queue_work(local->hw.workqueue, &ifsta->work);
2012                 return;
2013         }
2014
2015  fail:
2016         kfree_skb(skb);
2017 }
2018
2019 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2020                                          struct sk_buff *skb)
2021 {
2022         struct ieee80211_rx_status *rx_status;
2023         struct ieee80211_if_sta *ifsta;
2024         struct ieee80211_mgmt *mgmt;
2025         u16 fc;
2026
2027         ifsta = &sdata->u.sta;
2028
2029         rx_status = (struct ieee80211_rx_status *) skb->cb;
2030         mgmt = (struct ieee80211_mgmt *) skb->data;
2031         fc = le16_to_cpu(mgmt->frame_control);
2032
2033         switch (fc & IEEE80211_FCTL_STYPE) {
2034         case IEEE80211_STYPE_PROBE_REQ:
2035                 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len);
2036                 break;
2037         case IEEE80211_STYPE_PROBE_RESP:
2038                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
2039                 break;
2040         case IEEE80211_STYPE_BEACON:
2041                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2042                 break;
2043         case IEEE80211_STYPE_AUTH:
2044                 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
2045                 break;
2046         case IEEE80211_STYPE_ASSOC_RESP:
2047                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
2048                 break;
2049         case IEEE80211_STYPE_REASSOC_RESP:
2050                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
2051                 break;
2052         case IEEE80211_STYPE_DEAUTH:
2053                 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
2054                 break;
2055         case IEEE80211_STYPE_DISASSOC:
2056                 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
2057                 break;
2058         }
2059
2060         kfree_skb(skb);
2061 }
2062
2063
2064 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
2065 {
2066         struct ieee80211_local *local = sdata->local;
2067         int active = 0;
2068         struct sta_info *sta;
2069
2070         rcu_read_lock();
2071
2072         list_for_each_entry_rcu(sta, &local->sta_list, list) {
2073                 if (sta->sdata == sdata &&
2074                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
2075                                jiffies)) {
2076                         active++;
2077                         break;
2078                 }
2079         }
2080
2081         rcu_read_unlock();
2082
2083         return active;
2084 }
2085
2086
2087 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
2088                                      struct ieee80211_if_sta *ifsta)
2089 {
2090         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2091
2092         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
2093         if (ieee80211_sta_active_ibss(sdata))
2094                 return;
2095
2096         if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
2097             (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
2098                 return;
2099
2100         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2101                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
2102         ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
2103 }
2104
2105
2106 static void ieee80211_sta_timer(unsigned long data)
2107 {
2108         struct ieee80211_sub_if_data *sdata =
2109                 (struct ieee80211_sub_if_data *) data;
2110         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2111         struct ieee80211_local *local = sdata->local;
2112
2113         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2114         queue_work(local->hw.workqueue, &ifsta->work);
2115 }
2116
2117 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
2118                                      struct ieee80211_if_sta *ifsta)
2119 {
2120         struct ieee80211_local *local = sdata->local;
2121
2122         if (local->ops->reset_tsf) {
2123                 /* Reset own TSF to allow time synchronization work. */
2124                 local->ops->reset_tsf(local_to_hw(local));
2125         }
2126
2127         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2128
2129
2130         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2131                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2132         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2133                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2134         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2135                 ifsta->auth_alg = WLAN_AUTH_LEAP;
2136         else
2137                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2138         ifsta->auth_transaction = -1;
2139         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2140         ifsta->assoc_scan_tries = 0;
2141         ifsta->direct_probe_tries = 0;
2142         ifsta->auth_tries = 0;
2143         ifsta->assoc_tries = 0;
2144         netif_tx_stop_all_queues(sdata->dev);
2145         netif_carrier_off(sdata->dev);
2146 }
2147
2148
2149 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2150                                     const char *ssid, int ssid_len)
2151 {
2152         int tmp, hidden_ssid;
2153
2154         if (ssid_len == ifsta->ssid_len &&
2155             !memcmp(ifsta->ssid, ssid, ssid_len))
2156                 return 1;
2157
2158         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2159                 return 0;
2160
2161         hidden_ssid = 1;
2162         tmp = ssid_len;
2163         while (tmp--) {
2164                 if (ssid[tmp] != '\0') {
2165                         hidden_ssid = 0;
2166                         break;
2167                 }
2168         }
2169
2170         if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
2171                 return 1;
2172
2173         if (ssid_len == 1 && ssid[0] == ' ')
2174                 return 1;
2175
2176         return 0;
2177 }
2178
2179 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2180                                      struct ieee80211_if_sta *ifsta)
2181 {
2182         struct ieee80211_local *local = sdata->local;
2183         struct ieee80211_bss *bss;
2184         struct ieee80211_supported_band *sband;
2185         u8 bssid[ETH_ALEN], *pos;
2186         int i;
2187         int ret;
2188
2189         if (sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) {
2190                 memcpy(bssid, ifsta->bssid, ETH_ALEN);
2191         } else {
2192                 /* Generate random, not broadcast, locally administered BSSID. Mix in
2193                  * own MAC address to make sure that devices that do not have proper
2194                  * random number generator get different BSSID. */
2195                 get_random_bytes(bssid, ETH_ALEN);
2196                 for (i = 0; i < ETH_ALEN; i++)
2197                         bssid[i] ^= sdata->dev->dev_addr[i];
2198                 bssid[0] &= ~0x01;
2199                 bssid[0] |= 0x02;
2200         }
2201
2202         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2203                sdata->dev->name, bssid);
2204
2205         bss = ieee80211_rx_bss_add(local, bssid,
2206                                    local->hw.conf.channel->center_freq,
2207                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2208         if (!bss)
2209                 return -ENOMEM;
2210
2211         bss->band = local->hw.conf.channel->band;
2212         sband = local->hw.wiphy->bands[bss->band];
2213
2214         if (local->hw.conf.beacon_int == 0)
2215                 local->hw.conf.beacon_int = 100;
2216         bss->beacon_int = local->hw.conf.beacon_int;
2217         bss->last_update = jiffies;
2218         bss->capability = WLAN_CAPABILITY_IBSS;
2219
2220         if (sdata->default_key)
2221                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2222         else
2223                 sdata->drop_unencrypted = 0;
2224
2225         bss->supp_rates_len = sband->n_bitrates;
2226         pos = bss->supp_rates;
2227         for (i = 0; i < sband->n_bitrates; i++) {
2228                 int rate = sband->bitrates[i].bitrate;
2229                 *pos++ = (u8) (rate / 5);
2230         }
2231
2232         ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2233         ieee80211_rx_bss_put(local, bss);
2234         return ret;
2235 }
2236
2237
2238 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2239                                    struct ieee80211_if_sta *ifsta)
2240 {
2241         struct ieee80211_local *local = sdata->local;
2242         struct ieee80211_bss *bss;
2243         int found = 0;
2244         u8 bssid[ETH_ALEN];
2245         int active_ibss;
2246
2247         if (ifsta->ssid_len == 0)
2248                 return -EINVAL;
2249
2250         active_ibss = ieee80211_sta_active_ibss(sdata);
2251 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2252         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2253                sdata->dev->name, active_ibss);
2254 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2255         spin_lock_bh(&local->bss_lock);
2256         list_for_each_entry(bss, &local->bss_list, list) {
2257                 if (ifsta->ssid_len != bss->ssid_len ||
2258                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2259                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2260                         continue;
2261                 if ((ifsta->flags & IEEE80211_STA_BSSID_SET) &&
2262                     memcmp(ifsta->bssid, bss->bssid, ETH_ALEN) != 0)
2263                         continue;
2264 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2265                 printk(KERN_DEBUG "   bssid=%pM found\n", bss->bssid);
2266 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2267                 memcpy(bssid, bss->bssid, ETH_ALEN);
2268                 found = 1;
2269                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2270                         break;
2271         }
2272         spin_unlock_bh(&local->bss_lock);
2273
2274 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2275         if (found)
2276                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
2277                        "%pM\n", bssid, ifsta->bssid);
2278 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2279
2280         if (found &&
2281             ((!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) ||
2282              memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0)) {
2283                 int ret;
2284                 int search_freq;
2285
2286                 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2287                         search_freq = bss->freq;
2288                 else
2289                         search_freq = local->hw.conf.channel->center_freq;
2290
2291                 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2292                                            ifsta->ssid, ifsta->ssid_len);
2293                 if (!bss)
2294                         goto dont_join;
2295
2296                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2297                        " based on configured SSID\n",
2298                        sdata->dev->name, bssid);
2299                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2300                 ieee80211_rx_bss_put(local, bss);
2301                 return ret;
2302         }
2303
2304 dont_join:
2305 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2306         printk(KERN_DEBUG "   did not try to join ibss\n");
2307 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2308
2309         /* Selected IBSS not found in current scan results - try to scan */
2310         if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2311             !ieee80211_sta_active_ibss(sdata)) {
2312                 mod_timer(&ifsta->timer, jiffies +
2313                                       IEEE80211_IBSS_MERGE_INTERVAL);
2314         } else if (time_after(jiffies, local->last_scan_completed +
2315                               IEEE80211_SCAN_INTERVAL)) {
2316                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2317                        "join\n", sdata->dev->name);
2318                 return ieee80211_request_scan(sdata, ifsta->ssid,
2319                                               ifsta->ssid_len);
2320         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2321                 int interval = IEEE80211_SCAN_INTERVAL;
2322
2323                 if (time_after(jiffies, ifsta->ibss_join_req +
2324                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2325                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2326                             (!(local->oper_channel->flags &
2327                                         IEEE80211_CHAN_NO_IBSS)))
2328                                 return ieee80211_sta_create_ibss(sdata, ifsta);
2329                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2330                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
2331                                        " %d MHz\n", sdata->dev->name,
2332                                        local->hw.conf.channel->center_freq);
2333                         }
2334
2335                         /* No IBSS found - decrease scan interval and continue
2336                          * scanning. */
2337                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2338                 }
2339
2340                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2341                 mod_timer(&ifsta->timer, jiffies + interval);
2342                 return 0;
2343         }
2344
2345         return 0;
2346 }
2347
2348
2349 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2350                                      struct ieee80211_if_sta *ifsta)
2351 {
2352         struct ieee80211_local *local = sdata->local;
2353         struct ieee80211_bss *bss, *selected = NULL;
2354         int top_rssi = 0, freq;
2355
2356         spin_lock_bh(&local->bss_lock);
2357         freq = local->oper_channel->center_freq;
2358         list_for_each_entry(bss, &local->bss_list, list) {
2359                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2360                         continue;
2361
2362                 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2363                         IEEE80211_STA_AUTO_BSSID_SEL |
2364                         IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2365                     (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2366                      !!sdata->default_key))
2367                         continue;
2368
2369                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2370                     bss->freq != freq)
2371                         continue;
2372
2373                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2374                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2375                         continue;
2376
2377                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2378                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2379                         continue;
2380
2381                 if (!selected || top_rssi < bss->signal) {
2382                         selected = bss;
2383                         top_rssi = bss->signal;
2384                 }
2385         }
2386         if (selected)
2387                 atomic_inc(&selected->users);
2388         spin_unlock_bh(&local->bss_lock);
2389
2390         if (selected) {
2391                 ieee80211_set_freq(sdata, selected->freq);
2392                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2393                         ieee80211_sta_set_ssid(sdata, selected->ssid,
2394                                                selected->ssid_len);
2395                 ieee80211_sta_set_bssid(sdata, selected->bssid);
2396                 ieee80211_sta_def_wmm_params(sdata, selected);
2397                 if (sdata->u.sta.mfp == IEEE80211_MFP_REQUIRED)
2398                         sdata->u.sta.flags |= IEEE80211_STA_MFP_ENABLED;
2399                 else
2400                         sdata->u.sta.flags &= ~IEEE80211_STA_MFP_ENABLED;
2401
2402                 /* Send out direct probe if no probe resp was received or
2403                  * the one we have is outdated
2404                  */
2405                 if (!selected->last_probe_resp ||
2406                     time_after(jiffies, selected->last_probe_resp
2407                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2408                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2409                 else
2410                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2411
2412                 ieee80211_rx_bss_put(local, selected);
2413                 ieee80211_sta_reset_auth(sdata, ifsta);
2414                 return 0;
2415         } else {
2416                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2417                         ifsta->assoc_scan_tries++;
2418                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2419                                 ieee80211_start_scan(sdata, NULL, 0);
2420                         else
2421                                 ieee80211_start_scan(sdata, ifsta->ssid,
2422                                                          ifsta->ssid_len);
2423                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2424                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2425                 } else {
2426                         ifsta->assoc_scan_tries = 0;
2427                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
2428                 }
2429         }
2430         return -1;
2431 }
2432
2433
2434 static void ieee80211_sta_work(struct work_struct *work)
2435 {
2436         struct ieee80211_sub_if_data *sdata =
2437                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2438         struct ieee80211_local *local = sdata->local;
2439         struct ieee80211_if_sta *ifsta;
2440         struct sk_buff *skb;
2441
2442         if (!netif_running(sdata->dev))
2443                 return;
2444
2445         if (local->sw_scanning || local->hw_scanning)
2446                 return;
2447
2448         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2449                     sdata->vif.type != NL80211_IFTYPE_ADHOC))
2450                 return;
2451         ifsta = &sdata->u.sta;
2452
2453         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2454                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2455
2456         if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2457             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2458             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2459             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2460                 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2461                                      ifsta->scan_ssid_len);
2462                 return;
2463         }
2464
2465         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2466                 if (ieee80211_sta_config_auth(sdata, ifsta))
2467                         return;
2468                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2469         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2470                 return;
2471
2472         switch (ifsta->state) {
2473         case IEEE80211_STA_MLME_DISABLED:
2474                 break;
2475         case IEEE80211_STA_MLME_DIRECT_PROBE:
2476                 ieee80211_direct_probe(sdata, ifsta);
2477                 break;
2478         case IEEE80211_STA_MLME_AUTHENTICATE:
2479                 ieee80211_authenticate(sdata, ifsta);
2480                 break;
2481         case IEEE80211_STA_MLME_ASSOCIATE:
2482                 ieee80211_associate(sdata, ifsta);
2483                 break;
2484         case IEEE80211_STA_MLME_ASSOCIATED:
2485                 ieee80211_associated(sdata, ifsta);
2486                 break;
2487         case IEEE80211_STA_MLME_IBSS_SEARCH:
2488                 ieee80211_sta_find_ibss(sdata, ifsta);
2489                 break;
2490         case IEEE80211_STA_MLME_IBSS_JOINED:
2491                 ieee80211_sta_merge_ibss(sdata, ifsta);
2492                 break;
2493         default:
2494                 WARN_ON(1);
2495                 break;
2496         }
2497
2498         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2499                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2500                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2501
2502                 ieee80211_set_disassoc(sdata, ifsta, false, true,
2503                                         WLAN_REASON_UNSPECIFIED);
2504         }
2505 }
2506
2507 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2508 {
2509         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2510                 queue_work(sdata->local->hw.workqueue,
2511                            &sdata->u.sta.work);
2512 }
2513
2514 /* interface setup */
2515 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2516 {
2517         struct ieee80211_if_sta *ifsta;
2518
2519         ifsta = &sdata->u.sta;
2520         INIT_WORK(&ifsta->work, ieee80211_sta_work);
2521         INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
2522         setup_timer(&ifsta->timer, ieee80211_sta_timer,
2523                     (unsigned long) sdata);
2524         setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
2525                     (unsigned long) sdata);
2526         skb_queue_head_init(&ifsta->skb_queue);
2527
2528         ifsta->capab = WLAN_CAPABILITY_ESS;
2529         ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2530                 IEEE80211_AUTH_ALG_SHARED_KEY;
2531         ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2532                 IEEE80211_STA_AUTO_BSSID_SEL |
2533                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2534         if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2535                 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2536 }
2537
2538 /*
2539  * Add a new IBSS station, will also be called by the RX code when,
2540  * in IBSS mode, receiving a frame from a yet-unknown station, hence
2541  * must be callable in atomic context.
2542  */
2543 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2544                                         u8 *bssid,u8 *addr, u32 supp_rates)
2545 {
2546         struct ieee80211_local *local = sdata->local;
2547         struct sta_info *sta;
2548         int band = local->hw.conf.channel->band;
2549
2550         /* TODO: Could consider removing the least recently used entry and
2551          * allow new one to be added. */
2552         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2553                 if (net_ratelimit()) {
2554                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2555                                "entry %pM\n", sdata->dev->name, addr);
2556                 }
2557                 return NULL;
2558         }
2559
2560         if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2561                 return NULL;
2562
2563 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2564         printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2565                wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2566 #endif
2567
2568         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2569         if (!sta)
2570                 return NULL;
2571
2572         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2573
2574         /* make sure mandatory rates are always added */
2575         sta->sta.supp_rates[band] = supp_rates |
2576                         ieee80211_mandatory_rates(local, band);
2577
2578         rate_control_rate_init(sta);
2579
2580         if (sta_info_insert(sta))
2581                 return NULL;
2582
2583         return sta;
2584 }
2585
2586 /* configuration hooks */
2587 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2588                             struct ieee80211_if_sta *ifsta)
2589 {
2590         struct ieee80211_local *local = sdata->local;
2591
2592         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2593                 return;
2594
2595         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2596                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2597             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2598                              IEEE80211_STA_AUTO_SSID_SEL))) {
2599
2600                 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2601                         ieee80211_set_disassoc(sdata, ifsta, true, true,
2602                                                WLAN_REASON_DEAUTH_LEAVING);
2603
2604                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2605                 queue_work(local->hw.workqueue, &ifsta->work);
2606         }
2607 }
2608
2609 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2610 {
2611         struct ieee80211_if_sta *ifsta;
2612
2613         if (len > IEEE80211_MAX_SSID_LEN)
2614                 return -EINVAL;
2615
2616         ifsta = &sdata->u.sta;
2617
2618         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2619                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2620                 memcpy(ifsta->ssid, ssid, len);
2621                 ifsta->ssid_len = len;
2622         }
2623
2624         ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2625
2626         if (len)
2627                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2628         else
2629                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2630
2631         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2632                 ifsta->ibss_join_req = jiffies;
2633                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2634                 return ieee80211_sta_find_ibss(sdata, ifsta);
2635         }
2636
2637         return 0;
2638 }
2639
2640 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2641 {
2642         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2643         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2644         *len = ifsta->ssid_len;
2645         return 0;
2646 }
2647
2648 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2649 {
2650         struct ieee80211_if_sta *ifsta;
2651
2652         ifsta = &sdata->u.sta;
2653
2654         if (is_valid_ether_addr(bssid)) {
2655                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2656                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2657         } else {
2658                 memset(ifsta->bssid, 0, ETH_ALEN);
2659                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2660         }
2661
2662         if (netif_running(sdata->dev)) {
2663                 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
2664                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2665                                "the low-level driver\n", sdata->dev->name);
2666                 }
2667         }
2668
2669         return ieee80211_sta_set_ssid(sdata, ifsta->ssid, ifsta->ssid_len);
2670 }
2671
2672 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2673 {
2674         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2675
2676         kfree(ifsta->extra_ie);
2677         if (len == 0) {
2678                 ifsta->extra_ie = NULL;
2679                 ifsta->extra_ie_len = 0;
2680                 return 0;
2681         }
2682         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2683         if (!ifsta->extra_ie) {
2684                 ifsta->extra_ie_len = 0;
2685                 return -ENOMEM;
2686         }
2687         memcpy(ifsta->extra_ie, ie, len);
2688         ifsta->extra_ie_len = len;
2689         return 0;
2690 }
2691
2692 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2693 {
2694         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2695
2696         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2697                sdata->dev->name, reason);
2698
2699         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2700             sdata->vif.type != NL80211_IFTYPE_ADHOC)
2701                 return -EINVAL;
2702
2703         ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2704         return 0;
2705 }
2706
2707 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2708 {
2709         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2710
2711         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2712                sdata->dev->name, reason);
2713
2714         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2715                 return -EINVAL;
2716
2717         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2718                 return -1;
2719
2720         ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2721         return 0;
2722 }
2723
2724 /* scan finished notification */
2725 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2726 {
2727         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2728         struct ieee80211_if_sta *ifsta;
2729
2730         if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2731                 ifsta = &sdata->u.sta;
2732                 if ((!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) ||
2733                     !ieee80211_sta_active_ibss(sdata))
2734                         ieee80211_sta_find_ibss(sdata, ifsta);
2735         }
2736
2737         /* Restart STA timers */
2738         rcu_read_lock();
2739         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2740                 ieee80211_restart_sta_timer(sdata);
2741         rcu_read_unlock();
2742 }
2743
2744 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2745 {
2746         struct ieee80211_local *local =
2747                 container_of(work, struct ieee80211_local,
2748                              dynamic_ps_disable_work);
2749
2750         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2751                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2752                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2753         }
2754
2755         ieee80211_wake_queues_by_reason(&local->hw,
2756                                         IEEE80211_QUEUE_STOP_REASON_PS);
2757 }
2758
2759 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2760 {
2761         struct ieee80211_local *local =
2762                 container_of(work, struct ieee80211_local,
2763                              dynamic_ps_enable_work);
2764         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2765
2766         if (local->hw.conf.flags & IEEE80211_CONF_PS)
2767                 return;
2768
2769         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2770                 ieee80211_send_nullfunc(local, sdata, 1);
2771
2772         local->hw.conf.flags |= IEEE80211_CONF_PS;
2773         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2774 }
2775
2776 void ieee80211_dynamic_ps_timer(unsigned long data)
2777 {
2778         struct ieee80211_local *local = (void *) data;
2779
2780         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2781 }