net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/wireless.h>
  19 #include <linux/random.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <net/iw_handler.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "rate.h"
  28 #include "led.h"
  29
  30 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
  31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  32 #define IEEE80211_AUTH_MAX_TRIES 3
  33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  34 #define IEEE80211_ASSOC_MAX_TRIES 3
  35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  36 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
  37 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  38 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  39 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
  40 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  41
  42 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  43 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  44
  45 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  46
  47
  48 /* utils */
  49 static int ecw2cw(int ecw)
  50 {
  51         return (1 << ecw) - 1;
  52 }
  53
  54 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  55 {
  56         u8 *end, *pos;
  57
  58         pos = bss->ies;
  59         if (pos == NULL)
  60                 return NULL;
  61         end = pos + bss->ies_len;
  62
  63         while (pos + 1 < end) {
  64                 if (pos + 2 + pos[1] > end)
  65                         break;
  66                 if (pos[0] == ie)
  67                         return pos;
  68                 pos += 2 + pos[1];
  69         }
  70
  71         return NULL;
  72 }
  73
  74 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  75                                       struct ieee80211_supported_band *sband,
  76                                       u32 *rates)
  77 {
  78         int i, j, count;
  79         *rates = 0;
  80         count = 0;
  81         for (i = 0; i < bss->supp_rates_len; i++) {
  82                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  83
  84                 for (j = 0; j < sband->n_bitrates; j++)
  85                         if (sband->bitrates[j].bitrate == rate) {
  86                                 *rates |= BIT(j);
  87                                 count++;
  88                                 break;
  89                         }
  90         }
  91
  92         return count;
  93 }
  94
  95 /* also used by mesh code */
  96 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
  97                             struct ieee802_11_elems *elems,
  98                             enum ieee80211_band band)
  99 {
 100         struct ieee80211_supported_band *sband;
 101         struct ieee80211_rate *bitrates;
 102         size_t num_rates;
 103         u32 supp_rates;
 104         int i, j;
 105         sband = local->hw.wiphy->bands[band];
 106
 107         if (!sband) {
 108                 WARN_ON(1);
 109                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 110         }
 111
 112         bitrates = sband->bitrates;
 113         num_rates = sband->n_bitrates;
 114         supp_rates = 0;
 115         for (i = 0; i < elems->supp_rates_len +
 116                      elems->ext_supp_rates_len; i++) {
 117                 u8 rate = 0;
 118                 int own_rate;
 119                 if (i < elems->supp_rates_len)
 120                         rate = elems->supp_rates[i];
 121                 else if (elems->ext_supp_rates)
 122                         rate = elems->ext_supp_rates
 123                                 [i - elems->supp_rates_len];
 124                 own_rate = 5 * (rate & 0x7f);
 125                 for (j = 0; j < num_rates; j++)
 126                         if (bitrates[j].bitrate == own_rate)
 127                                 supp_rates |= BIT(j);
 128         }
 129         return supp_rates;
 130 }
 131
 132 /* frame sending functions */
 133
 134 static void add_extra_ies(struct sk_buff *skb, u8 *ies, size_t ies_len)
 135 {
 136         if (ies)
 137                 memcpy(skb_put(skb, ies_len), ies, ies_len);
 138 }
 139
 140 /* also used by scanning code */
 141 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 142                               u8 *ssid, size_t ssid_len)
 143 {
 144         struct ieee80211_local *local = sdata->local;
 145         struct ieee80211_supported_band *sband;
 146         struct sk_buff *skb;
 147         struct ieee80211_mgmt *mgmt;
 148         u8 *pos, *supp_rates, *esupp_rates = NULL;
 149         int i;
 150
 151         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
 152                             sdata->u.sta.ie_probereq_len);
 153         if (!skb) {
 154                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 155                        "request\n", sdata->dev->name);
 156                 return;
 157         }
 158         skb_reserve(skb, local->hw.extra_tx_headroom);
 159
 160         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 161         memset(mgmt, 0, 24);
 162         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 163                                           IEEE80211_STYPE_PROBE_REQ);
 164         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 165         if (dst) {
 166                 memcpy(mgmt->da, dst, ETH_ALEN);
 167                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 168         } else {
 169                 memset(mgmt->da, 0xff, ETH_ALEN);
 170                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 171         }
 172         pos = skb_put(skb, 2 + ssid_len);
 173         *pos++ = WLAN_EID_SSID;
 174         *pos++ = ssid_len;
 175         memcpy(pos, ssid, ssid_len);
 176
 177         supp_rates = skb_put(skb, 2);
 178         supp_rates[0] = WLAN_EID_SUPP_RATES;
 179         supp_rates[1] = 0;
 180         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 181
 182         for (i = 0; i < sband->n_bitrates; i++) {
 183                 struct ieee80211_rate *rate = &sband->bitrates[i];
 184                 if (esupp_rates) {
 185                         pos = skb_put(skb, 1);
 186                         esupp_rates[1]++;
 187                 } else if (supp_rates[1] == 8) {
 188                         esupp_rates = skb_put(skb, 3);
 189                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 190                         esupp_rates[1] = 1;
 191                         pos = &esupp_rates[2];
 192                 } else {
 193                         pos = skb_put(skb, 1);
 194                         supp_rates[1]++;
 195                 }
 196                 *pos = rate->bitrate / 5;
 197         }
 198
 199         add_extra_ies(skb, sdata->u.sta.ie_probereq,
 200                       sdata->u.sta.ie_probereq_len);
 201
 202         ieee80211_tx_skb(sdata, skb, 0);
 203 }
 204
 205 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 206                                 struct ieee80211_if_sta *ifsta,
 207                                 int transaction, u8 *extra, size_t extra_len,
 208                                 int encrypt)
 209 {
 210         struct ieee80211_local *local = sdata->local;
 211         struct sk_buff *skb;
 212         struct ieee80211_mgmt *mgmt;
 213
 214         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 215                             sizeof(*mgmt) + 6 + extra_len +
 216                             sdata->u.sta.ie_auth_len);
 217         if (!skb) {
 218                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 219                        "frame\n", sdata->dev->name);
 220                 return;
 221         }
 222         skb_reserve(skb, local->hw.extra_tx_headroom);
 223
 224         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 225         memset(mgmt, 0, 24 + 6);
 226         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 227                                           IEEE80211_STYPE_AUTH);
 228         if (encrypt)
 229                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 230         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 231         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 232         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 233         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
 234         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 235         ifsta->auth_transaction = transaction + 1;
 236         mgmt->u.auth.status_code = cpu_to_le16(0);
 237         if (extra)
 238                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 239         add_extra_ies(skb, sdata->u.sta.ie_auth, sdata->u.sta.ie_auth_len);
 240
 241         ieee80211_tx_skb(sdata, skb, encrypt);
 242 }
 243
 244 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
 245                                  struct ieee80211_if_sta *ifsta)
 246 {
 247         struct ieee80211_local *local = sdata->local;
 248         struct sk_buff *skb;
 249         struct ieee80211_mgmt *mgmt;
 250         u8 *pos, *ies, *ht_ie, *e_ies;
 251         int i, len, count, rates_len, supp_rates_len;
 252         u16 capab;
 253         struct ieee80211_bss *bss;
 254         int wmm = 0;
 255         struct ieee80211_supported_band *sband;
 256         u32 rates = 0;
 257         size_t e_ies_len;
 258
 259         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 260                 e_ies = sdata->u.sta.ie_reassocreq;
 261                 e_ies_len = sdata->u.sta.ie_reassocreq_len;
 262         } else {
 263                 e_ies = sdata->u.sta.ie_assocreq;
 264                 e_ies_len = sdata->u.sta.ie_assocreq_len;
 265         }
 266
 267         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 268                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
 269                             ifsta->ssid_len + e_ies_len);
 270         if (!skb) {
 271                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 272                        "frame\n", sdata->dev->name);
 273                 return;
 274         }
 275         skb_reserve(skb, local->hw.extra_tx_headroom);
 276
 277         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 278
 279         capab = ifsta->capab;
 280
 281         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 282                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 283                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 284                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 285                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 286         }
 287
 288         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 289                                    local->hw.conf.channel->center_freq,
 290                                    ifsta->ssid, ifsta->ssid_len);
 291         if (bss) {
 292                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 293                         capab |= WLAN_CAPABILITY_PRIVACY;
 294                 if (bss->wmm_used)
 295                         wmm = 1;
 296
 297                 /* get all rates supported by the device and the AP as
 298                  * some APs don't like getting a superset of their rates
 299                  * in the association request (e.g. D-Link DAP 1353 in
 300                  * b-only mode) */
 301                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 302
 303                 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 304                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 305                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 306
 307                 ieee80211_rx_bss_put(local, bss);
 308         } else {
 309                 rates = ~0;
 310                 rates_len = sband->n_bitrates;
 311         }
 312
 313         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 314         memset(mgmt, 0, 24);
 315         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 316         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 317         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 318
 319         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 320                 skb_put(skb, 10);
 321                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 322                                                   IEEE80211_STYPE_REASSOC_REQ);
 323                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 324                 mgmt->u.reassoc_req.listen_interval =
 325                                 cpu_to_le16(local->hw.conf.listen_interval);
 326                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
 327                        ETH_ALEN);
 328         } else {
 329                 skb_put(skb, 4);
 330                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 331                                                   IEEE80211_STYPE_ASSOC_REQ);
 332                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 333                 mgmt->u.assoc_req.listen_interval =
 334                                 cpu_to_le16(local->hw.conf.listen_interval);
 335         }
 336
 337         /* SSID */
 338         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
 339         *pos++ = WLAN_EID_SSID;
 340         *pos++ = ifsta->ssid_len;
 341         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
 342
 343         /* add all rates which were marked to be used above */
 344         supp_rates_len = rates_len;
 345         if (supp_rates_len > 8)
 346                 supp_rates_len = 8;
 347
 348         len = sband->n_bitrates;
 349         pos = skb_put(skb, supp_rates_len + 2);
 350         *pos++ = WLAN_EID_SUPP_RATES;
 351         *pos++ = supp_rates_len;
 352
 353         count = 0;
 354         for (i = 0; i < sband->n_bitrates; i++) {
 355                 if (BIT(i) & rates) {
 356                         int rate = sband->bitrates[i].bitrate;
 357                         *pos++ = (u8) (rate / 5);
 358                         if (++count == 8)
 359                                 break;
 360                 }
 361         }
 362
 363         if (rates_len > count) {
 364                 pos = skb_put(skb, rates_len - count + 2);
 365                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 366                 *pos++ = rates_len - count;
 367
 368                 for (i++; i < sband->n_bitrates; i++) {
 369                         if (BIT(i) & rates) {
 370                                 int rate = sband->bitrates[i].bitrate;
 371                                 *pos++ = (u8) (rate / 5);
 372                         }
 373                 }
 374         }
 375
 376         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 377                 /* 1. power capabilities */
 378                 pos = skb_put(skb, 4);
 379                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 380                 *pos++ = 2;
 381                 *pos++ = 0; /* min tx power */
 382                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 383
 384                 /* 2. supported channels */
 385                 /* TODO: get this in reg domain format */
 386                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 387                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 388                 *pos++ = 2 * sband->n_channels;
 389                 for (i = 0; i < sband->n_channels; i++) {
 390                         *pos++ = ieee80211_frequency_to_channel(
 391                                         sband->channels[i].center_freq);
 392                         *pos++ = 1; /* one channel in the subband*/
 393                 }
 394         }
 395
 396         if (ifsta->extra_ie) {
 397                 pos = skb_put(skb, ifsta->extra_ie_len);
 398                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
 399         }
 400
 401         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
 402                 pos = skb_put(skb, 9);
 403                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 404                 *pos++ = 7; /* len */
 405                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 406                 *pos++ = 0x50;
 407                 *pos++ = 0xf2;
 408                 *pos++ = 2; /* WME */
 409                 *pos++ = 0; /* WME info */
 410                 *pos++ = 1; /* WME ver */
 411                 *pos++ = 0;
 412         }
 413
 414         /* wmm support is a must to HT */
 415         /*
 416          * IEEE802.11n does not allow TKIP/WEP as pairwise
 417          * ciphers in HT mode. We still associate in non-ht
 418          * mode (11a/b/g) if any one of these ciphers is
 419          * configured as pairwise.
 420          */
 421         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
 422             sband->ht_cap.ht_supported &&
 423             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
 424             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 425             (!(ifsta->flags & IEEE80211_STA_TKIP_WEP_USED))) {
 426                 struct ieee80211_ht_info *ht_info =
 427                         (struct ieee80211_ht_info *)(ht_ie + 2);
 428                 u16 cap = sband->ht_cap.cap;
 429                 __le16 tmp;
 430                 u32 flags = local->hw.conf.channel->flags;
 431
 432                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 433                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 434                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 435                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 436                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 437                         }
 438                         break;
 439                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 440                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 441                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 442                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 443                         }
 444                         break;
 445                 }
 446
 447                 tmp = cpu_to_le16(cap);
 448                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 449                 *pos++ = WLAN_EID_HT_CAPABILITY;
 450                 *pos++ = sizeof(struct ieee80211_ht_cap);
 451                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 452                 memcpy(pos, &tmp, sizeof(u16));
 453                 pos += sizeof(u16);
 454                 /* TODO: needs a define here for << 2 */
 455                 *pos++ = sband->ht_cap.ampdu_factor |
 456                          (sband->ht_cap.ampdu_density << 2);
 457                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 458         }
 459
 460         add_extra_ies(skb, e_ies, e_ies_len);
 461
 462         kfree(ifsta->assocreq_ies);
 463         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
 464         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
 465         if (ifsta->assocreq_ies)
 466                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
 467
 468         ieee80211_tx_skb(sdata, skb, 0);
 469 }
 470
 471
 472 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 473                                            u16 stype, u16 reason)
 474 {
 475         struct ieee80211_local *local = sdata->local;
 476         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 477         struct sk_buff *skb;
 478         struct ieee80211_mgmt *mgmt;
 479         u8 *ies;
 480         size_t ies_len;
 481
 482         if (stype == IEEE80211_STYPE_DEAUTH) {
 483                 ies = sdata->u.sta.ie_deauth;
 484                 ies_len = sdata->u.sta.ie_deauth_len;
 485         } else {
 486                 ies = sdata->u.sta.ie_disassoc;
 487                 ies_len = sdata->u.sta.ie_disassoc_len;
 488         }
 489
 490         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) +
 491                             ies_len);
 492         if (!skb) {
 493                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 494                        "deauth/disassoc frame\n", sdata->dev->name);
 495                 return;
 496         }
 497         skb_reserve(skb, local->hw.extra_tx_headroom);
 498
 499         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 500         memset(mgmt, 0, 24);
 501         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 502         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 503         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 504         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 505         skb_put(skb, 2);
 506         /* u.deauth.reason_code == u.disassoc.reason_code */
 507         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 508
 509         add_extra_ies(skb, ies, ies_len);
 510
 511         ieee80211_tx_skb(sdata, skb, ifsta->flags & IEEE80211_STA_MFP_ENABLED);
 512 }
 513
 514 /* MLME */
 515 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 516                                          struct ieee80211_bss *bss)
 517 {
 518         struct ieee80211_local *local = sdata->local;
 519         int i, have_higher_than_11mbit = 0;
 520
 521         /* cf. IEEE 802.11 9.2.12 */
 522         for (i = 0; i < bss->supp_rates_len; i++)
 523                 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
 524                         have_higher_than_11mbit = 1;
 525
 526         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 527             have_higher_than_11mbit)
 528                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 529         else
 530                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 531
 532         ieee80211_set_wmm_default(sdata);
 533 }
 534
 535 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 536                                      struct ieee80211_if_sta *ifsta,
 537                                      u8 *wmm_param, size_t wmm_param_len)
 538 {
 539         struct ieee80211_tx_queue_params params;
 540         size_t left;
 541         int count;
 542         u8 *pos;
 543
 544         if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
 545                 return;
 546
 547         if (!wmm_param)
 548                 return;
 549
 550         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 551                 return;
 552         count = wmm_param[6] & 0x0f;
 553         if (count == ifsta->wmm_last_param_set)
 554                 return;
 555         ifsta->wmm_last_param_set = count;
 556
 557         pos = wmm_param + 8;
 558         left = wmm_param_len - 8;
 559
 560         memset(&params, 0, sizeof(params));
 561
 562         if (!local->ops->conf_tx)
 563                 return;
 564
 565         local->wmm_acm = 0;
 566         for (; left >= 4; left -= 4, pos += 4) {
 567                 int aci = (pos[0] >> 5) & 0x03;
 568                 int acm = (pos[0] >> 4) & 0x01;
 569                 int queue;
 570
 571                 switch (aci) {
 572                 case 1:
 573                         queue = 3;
 574                         if (acm)
 575                                 local->wmm_acm |= BIT(0) | BIT(3);
 576                         break;
 577                 case 2:
 578                         queue = 1;
 579                         if (acm)
 580                                 local->wmm_acm |= BIT(4) | BIT(5);
 581                         break;
 582                 case 3:
 583                         queue = 0;
 584                         if (acm)
 585                                 local->wmm_acm |= BIT(6) | BIT(7);
 586                         break;
 587                 case 0:
 588                 default:
 589                         queue = 2;
 590                         if (acm)
 591                                 local->wmm_acm |= BIT(1) | BIT(2);
 592                         break;
 593                 }
 594
 595                 params.aifs = pos[0] & 0x0f;
 596                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 597                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 598                 params.txop = get_unaligned_le16(pos + 2);
 599 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 600                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 601                        "cWmin=%d cWmax=%d txop=%d\n",
 602                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 603                        params.cw_max, params.txop);
 604 #endif
 605                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
 606                  * AC for now) */
 607                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 608                         printk(KERN_DEBUG "%s: failed to set TX queue "
 609                                "parameters for queue %d\n", local->mdev->name, queue);
 610                 }
 611         }
 612 }
 613
 614 static bool check_tim(struct ieee802_11_elems *elems, u16 aid, bool *is_mc)
 615 {
 616         u8 mask;
 617         u8 index, indexn1, indexn2;
 618         struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
 619
 620         aid &= 0x3fff;
 621         index = aid / 8;
 622         mask  = 1 << (aid & 7);
 623
 624         if (tim->bitmap_ctrl & 0x01)
 625                 *is_mc = true;
 626
 627         indexn1 = tim->bitmap_ctrl & 0xfe;
 628         indexn2 = elems->tim_len + indexn1 - 4;
 629
 630         if (index < indexn1 || index > indexn2)
 631                 return false;
 632
 633         index -= indexn1;
 634
 635         return !!(tim->virtual_map[index] & mask);
 636 }
 637
 638 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 639                                            u16 capab, bool erp_valid, u8 erp)
 640 {
 641         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 642 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 643         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 644 #endif
 645         u32 changed = 0;
 646         bool use_protection;
 647         bool use_short_preamble;
 648         bool use_short_slot;
 649
 650         if (erp_valid) {
 651                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 652                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 653         } else {
 654                 use_protection = false;
 655                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 656         }
 657
 658         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 659
 660         if (use_protection != bss_conf->use_cts_prot) {
 661 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 662                 if (net_ratelimit()) {
 663                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 664                                sdata->dev->name,
 665                                use_protection ? "enabled" : "disabled",
 666                                ifsta->bssid);
 667                 }
 668 #endif
 669                 bss_conf->use_cts_prot = use_protection;
 670                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 671         }
 672
 673         if (use_short_preamble != bss_conf->use_short_preamble) {
 674 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 675                 if (net_ratelimit()) {
 676                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 677                                " (BSSID=%pM)\n",
 678                                sdata->dev->name,
 679                                use_short_preamble ? "short" : "long",
 680                                ifsta->bssid);
 681                 }
 682 #endif
 683                 bss_conf->use_short_preamble = use_short_preamble;
 684                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 685         }
 686
 687         if (use_short_slot != bss_conf->use_short_slot) {
 688 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 689                 if (net_ratelimit()) {
 690                         printk(KERN_DEBUG "%s: switched to %s slot time"
 691                                " (BSSID=%pM)\n",
 692                                sdata->dev->name,
 693                                use_short_slot ? "short" : "long",
 694                                ifsta->bssid);
 695                 }
 696 #endif
 697                 bss_conf->use_short_slot = use_short_slot;
 698                 changed |= BSS_CHANGED_ERP_SLOT;
 699         }
 700
 701         return changed;
 702 }
 703
 704 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
 705                                         struct ieee80211_if_sta *ifsta)
 706 {
 707         union iwreq_data wrqu;
 708         memset(&wrqu, 0, sizeof(wrqu));
 709         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
 710                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
 711         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 712         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 713 }
 714
 715 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
 716                                          struct ieee80211_if_sta *ifsta)
 717 {
 718         char *buf;
 719         size_t len;
 720         int i;
 721         union iwreq_data wrqu;
 722
 723         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
 724                 return;
 725
 726         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
 727                                 ifsta->assocresp_ies_len), GFP_KERNEL);
 728         if (!buf)
 729                 return;
 730
 731         len = sprintf(buf, "ASSOCINFO(");
 732         if (ifsta->assocreq_ies) {
 733                 len += sprintf(buf + len, "ReqIEs=");
 734                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
 735                         len += sprintf(buf + len, "%02x",
 736                                        ifsta->assocreq_ies[i]);
 737                 }
 738         }
 739         if (ifsta->assocresp_ies) {
 740                 if (ifsta->assocreq_ies)
 741                         len += sprintf(buf + len, " ");
 742                 len += sprintf(buf + len, "RespIEs=");
 743                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 744                         len += sprintf(buf + len, "%02x",
 745                                        ifsta->assocresp_ies[i]);
 746                 }
 747         }
 748         len += sprintf(buf + len, ")");
 749
 750         if (len > IW_CUSTOM_MAX) {
 751                 len = sprintf(buf, "ASSOCRESPIE=");
 752                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 753                         len += sprintf(buf + len, "%02x",
 754                                        ifsta->assocresp_ies[i]);
 755                 }
 756         }
 757
 758         if (len <= IW_CUSTOM_MAX) {
 759                 memset(&wrqu, 0, sizeof(wrqu));
 760                 wrqu.data.length = len;
 761                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 762         }
 763
 764         kfree(buf);
 765 }
 766
 767
 768 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 769                                      struct ieee80211_if_sta *ifsta,
 770                                      u32 bss_info_changed)
 771 {
 772         struct ieee80211_local *local = sdata->local;
 773         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 774
 775         struct ieee80211_bss *bss;
 776
 777         bss_info_changed |= BSS_CHANGED_ASSOC;
 778         ifsta->flags |= IEEE80211_STA_ASSOCIATED;
 779
 780         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 781                 return;
 782
 783         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 784                                    conf->channel->center_freq,
 785                                    ifsta->ssid, ifsta->ssid_len);
 786         if (bss) {
 787                 /* set timing information */
 788                 sdata->vif.bss_conf.beacon_int = bss->beacon_int;
 789                 sdata->vif.bss_conf.timestamp = bss->timestamp;
 790                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 791
 792                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 793                         bss->capability, bss->has_erp_value, bss->erp_value);
 794
 795                 ieee80211_rx_bss_put(local, bss);
 796         }
 797
 798         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
 799         memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 800         ieee80211_sta_send_associnfo(sdata, ifsta);
 801
 802         ifsta->last_probe = jiffies;
 803         ieee80211_led_assoc(local, 1);
 804
 805         sdata->vif.bss_conf.assoc = 1;
 806         /*
 807          * For now just always ask the driver to update the basic rateset
 808          * when we have associated, we aren't checking whether it actually
 809          * changed or not.
 810          */
 811         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 812         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 813
 814         if (local->powersave) {
 815                 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
 816                     local->hw.conf.dynamic_ps_timeout > 0) {
 817                         mod_timer(&local->dynamic_ps_timer, jiffies +
 818                                   msecs_to_jiffies(
 819                                         local->hw.conf.dynamic_ps_timeout));
 820                 } else {
 821                         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 822                                 ieee80211_send_nullfunc(local, sdata, 1);
 823                         conf->flags |= IEEE80211_CONF_PS;
 824                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 825                 }
 826         }
 827
 828         netif_tx_start_all_queues(sdata->dev);
 829         netif_carrier_on(sdata->dev);
 830
 831         ieee80211_sta_send_apinfo(sdata, ifsta);
 832 }
 833
 834 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
 835                                    struct ieee80211_if_sta *ifsta)
 836 {
 837         ifsta->direct_probe_tries++;
 838         if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 839                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 840                        sdata->dev->name, ifsta->bssid);
 841                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 842                 ieee80211_sta_send_apinfo(sdata, ifsta);
 843                 return;
 844         }
 845
 846         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 847                         sdata->dev->name, ifsta->bssid,
 848                         ifsta->direct_probe_tries);
 849
 850         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 851
 852         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
 853
 854         /* Direct probe is sent to broadcast address as some APs
 855          * will not answer to direct packet in unassociated state.
 856          */
 857         ieee80211_send_probe_req(sdata, NULL,
 858                                  ifsta->ssid, ifsta->ssid_len);
 859
 860         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 861 }
 862
 863
 864 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
 865                                    struct ieee80211_if_sta *ifsta)
 866 {
 867         ifsta->auth_tries++;
 868         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 869                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 870                        " timed out\n",
 871                        sdata->dev->name, ifsta->bssid);
 872                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 873                 ieee80211_sta_send_apinfo(sdata, ifsta);
 874                 return;
 875         }
 876
 877         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
 878         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 879                sdata->dev->name, ifsta->bssid);
 880
 881         ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
 882
 883         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 884 }
 885
 886 /*
 887  * The disassoc 'reason' argument can be either our own reason
 888  * if self disconnected or a reason code from the AP.
 889  */
 890 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 891                                    struct ieee80211_if_sta *ifsta, bool deauth,
 892                                    bool self_disconnected, u16 reason)
 893 {
 894         struct ieee80211_local *local = sdata->local;
 895         struct sta_info *sta;
 896         u32 changed = 0, config_changed = 0;
 897
 898         rcu_read_lock();
 899
 900         sta = sta_info_get(local, ifsta->bssid);
 901         if (!sta) {
 902                 rcu_read_unlock();
 903                 return;
 904         }
 905
 906         if (deauth) {
 907                 ifsta->direct_probe_tries = 0;
 908                 ifsta->auth_tries = 0;
 909         }
 910         ifsta->assoc_scan_tries = 0;
 911         ifsta->assoc_tries = 0;
 912
 913         netif_tx_stop_all_queues(sdata->dev);
 914         netif_carrier_off(sdata->dev);
 915
 916         ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
 917
 918         if (self_disconnected) {
 919                 if (deauth)
 920                         ieee80211_send_deauth_disassoc(sdata,
 921                                 IEEE80211_STYPE_DEAUTH, reason);
 922                 else
 923                         ieee80211_send_deauth_disassoc(sdata,
 924                                 IEEE80211_STYPE_DISASSOC, reason);
 925         }
 926
 927         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
 928         changed |= ieee80211_reset_erp_info(sdata);
 929
 930         ieee80211_led_assoc(local, 0);
 931         changed |= BSS_CHANGED_ASSOC;
 932         sdata->vif.bss_conf.assoc = false;
 933
 934         ieee80211_sta_send_apinfo(sdata, ifsta);
 935
 936         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT)
 937                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 938
 939         rcu_read_unlock();
 940
 941         /* channel(_type) changes are handled by ieee80211_hw_config */
 942         local->oper_channel_type = NL80211_CHAN_NO_HT;
 943
 944         local->power_constr_level = 0;
 945
 946         del_timer_sync(&local->dynamic_ps_timer);
 947         cancel_work_sync(&local->dynamic_ps_enable_work);
 948
 949         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 950                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 951                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 952         }
 953
 954         ieee80211_hw_config(local, config_changed);
 955         ieee80211_bss_info_change_notify(sdata, changed);
 956
 957         rcu_read_lock();
 958
 959         sta = sta_info_get(local, ifsta->bssid);
 960         if (!sta) {
 961                 rcu_read_unlock();
 962                 return;
 963         }
 964
 965         sta_info_unlink(&sta);
 966
 967         rcu_read_unlock();
 968
 969         sta_info_destroy(sta);
 970 }
 971
 972 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
 973 {
 974         if (!sdata || !sdata->default_key ||
 975             sdata->default_key->conf.alg != ALG_WEP)
 976                 return 0;
 977         return 1;
 978 }
 979
 980 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
 981                                       struct ieee80211_if_sta *ifsta)
 982 {
 983         struct ieee80211_local *local = sdata->local;
 984         struct ieee80211_bss *bss;
 985         int bss_privacy;
 986         int wep_privacy;
 987         int privacy_invoked;
 988
 989         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
 990                 return 0;
 991
 992         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 993                                    local->hw.conf.channel->center_freq,
 994                                    ifsta->ssid, ifsta->ssid_len);
 995         if (!bss)
 996                 return 0;
 997
 998         bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
 999         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1000         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
1001
1002         ieee80211_rx_bss_put(local, bss);
1003
1004         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1005                 return 0;
1006
1007         return 1;
1008 }
1009
1010 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1011                                 struct ieee80211_if_sta *ifsta)
1012 {
1013         ifsta->assoc_tries++;
1014         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1015                 printk(KERN_DEBUG "%s: association with AP %pM"
1016                        " timed out\n",
1017                        sdata->dev->name, ifsta->bssid);
1018                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1019                 ieee80211_sta_send_apinfo(sdata, ifsta);
1020                 return;
1021         }
1022
1023         ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1024         printk(KERN_DEBUG "%s: associate with AP %pM\n",
1025                sdata->dev->name, ifsta->bssid);
1026         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
1027                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1028                        "mixed-cell disabled - abort association\n", sdata->dev->name);
1029                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1030                 return;
1031         }
1032
1033         ieee80211_send_assoc(sdata, ifsta);
1034
1035         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1036 }
1037
1038
1039 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1040                                  struct ieee80211_if_sta *ifsta)
1041 {
1042         struct ieee80211_local *local = sdata->local;
1043         struct sta_info *sta;
1044         int disassoc;
1045
1046         /* TODO: start monitoring current AP signal quality and number of
1047          * missed beacons. Scan other channels every now and then and search
1048          * for better APs. */
1049         /* TODO: remove expired BSSes */
1050
1051         ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1052
1053         rcu_read_lock();
1054
1055         sta = sta_info_get(local, ifsta->bssid);
1056         if (!sta) {
1057                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1058                        sdata->dev->name, ifsta->bssid);
1059                 disassoc = 1;
1060         } else {
1061                 disassoc = 0;
1062                 if (time_after(jiffies,
1063                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1064                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1065                                 printk(KERN_DEBUG "%s: No ProbeResp from "
1066                                        "current AP %pM - assume out of "
1067                                        "range\n",
1068                                        sdata->dev->name, ifsta->bssid);
1069                                 disassoc = 1;
1070                         } else
1071                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1072                                                          ifsta->ssid,
1073                                                          ifsta->ssid_len);
1074                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1075                 } else {
1076                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1077                         if (time_after(jiffies, ifsta->last_probe +
1078                                        IEEE80211_PROBE_INTERVAL)) {
1079                                 ifsta->last_probe = jiffies;
1080                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1081                                                          ifsta->ssid,
1082                                                          ifsta->ssid_len);
1083                         }
1084                 }
1085         }
1086
1087         rcu_read_unlock();
1088
1089         if (disassoc)
1090                 ieee80211_set_disassoc(sdata, ifsta, true, true,
1091                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1092         else
1093                 mod_timer(&ifsta->timer, jiffies +
1094                                       IEEE80211_MONITORING_INTERVAL);
1095 }
1096
1097
1098 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1099                                      struct ieee80211_if_sta *ifsta)
1100 {
1101         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1102         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1103         ieee80211_associate(sdata, ifsta);
1104 }
1105
1106
1107 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1108                                      struct ieee80211_if_sta *ifsta,
1109                                      struct ieee80211_mgmt *mgmt,
1110                                      size_t len)
1111 {
1112         u8 *pos;
1113         struct ieee802_11_elems elems;
1114
1115         pos = mgmt->u.auth.variable;
1116         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1117         if (!elems.challenge)
1118                 return;
1119         ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1120                             elems.challenge_len + 2, 1);
1121 }
1122
1123 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1124                                    struct ieee80211_if_sta *ifsta,
1125                                    struct ieee80211_mgmt *mgmt,
1126                                    size_t len)
1127 {
1128         u16 auth_alg, auth_transaction, status_code;
1129
1130         if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1131             sdata->vif.type != NL80211_IFTYPE_ADHOC)
1132                 return;
1133
1134         if (len < 24 + 6)
1135                 return;
1136
1137         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1138             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1139                 return;
1140
1141         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1142             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1143                 return;
1144
1145         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1146         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1147         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1148
1149         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1150                 /*
1151                  * IEEE 802.11 standard does not require authentication in IBSS
1152                  * networks and most implementations do not seem to use it.
1153                  * However, try to reply to authentication attempts if someone
1154                  * has actually implemented this.
1155                  */
1156                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1157                         return;
1158                 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1159         }
1160
1161         if (auth_alg != ifsta->auth_alg ||
1162             auth_transaction != ifsta->auth_transaction)
1163                 return;
1164
1165         if (status_code != WLAN_STATUS_SUCCESS) {
1166                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1167                         u8 algs[3];
1168                         const int num_algs = ARRAY_SIZE(algs);
1169                         int i, pos;
1170                         algs[0] = algs[1] = algs[2] = 0xff;
1171                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1172                                 algs[0] = WLAN_AUTH_OPEN;
1173                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1174                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1175                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1176                                 algs[2] = WLAN_AUTH_LEAP;
1177                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1178                                 pos = 0;
1179                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1180                                 pos = 1;
1181                         else
1182                                 pos = 2;
1183                         for (i = 0; i < num_algs; i++) {
1184                                 pos++;
1185                                 if (pos >= num_algs)
1186                                         pos = 0;
1187                                 if (algs[pos] == ifsta->auth_alg ||
1188                                     algs[pos] == 0xff)
1189                                         continue;
1190                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1191                                     !ieee80211_sta_wep_configured(sdata))
1192                                         continue;
1193                                 ifsta->auth_alg = algs[pos];
1194                                 break;
1195                         }
1196                 }
1197                 return;
1198         }
1199
1200         switch (ifsta->auth_alg) {
1201         case WLAN_AUTH_OPEN:
1202         case WLAN_AUTH_LEAP:
1203                 ieee80211_auth_completed(sdata, ifsta);
1204                 break;
1205         case WLAN_AUTH_SHARED_KEY:
1206                 if (ifsta->auth_transaction == 4)
1207                         ieee80211_auth_completed(sdata, ifsta);
1208                 else
1209                         ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1210                 break;
1211         }
1212 }
1213
1214
1215 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1216                                      struct ieee80211_if_sta *ifsta,
1217                                      struct ieee80211_mgmt *mgmt,
1218                                      size_t len)
1219 {
1220         u16 reason_code;
1221
1222         if (len < 24 + 2)
1223                 return;
1224
1225         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1226                 return;
1227
1228         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1229
1230         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1231                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1232                                 sdata->dev->name, reason_code);
1233
1234         if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1235             ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1236             ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1237                 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1238                 mod_timer(&ifsta->timer, jiffies +
1239                                       IEEE80211_RETRY_AUTH_INTERVAL);
1240         }
1241
1242         ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1243         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1244 }
1245
1246
1247 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1248                                        struct ieee80211_if_sta *ifsta,
1249                                        struct ieee80211_mgmt *mgmt,
1250                                        size_t len)
1251 {
1252         u16 reason_code;
1253
1254         if (len < 24 + 2)
1255                 return;
1256
1257         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1258                 return;
1259
1260         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1261
1262         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1263                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1264                                 sdata->dev->name, reason_code);
1265
1266         if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1267                 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1268                 mod_timer(&ifsta->timer, jiffies +
1269                                       IEEE80211_RETRY_AUTH_INTERVAL);
1270         }
1271
1272         ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1273 }
1274
1275
1276 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1277                                          struct ieee80211_if_sta *ifsta,
1278                                          struct ieee80211_mgmt *mgmt,
1279                                          size_t len,
1280                                          int reassoc)
1281 {
1282         struct ieee80211_local *local = sdata->local;
1283         struct ieee80211_supported_band *sband;
1284         struct sta_info *sta;
1285         u32 rates, basic_rates;
1286         u16 capab_info, status_code, aid;
1287         struct ieee802_11_elems elems;
1288         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1289         u8 *pos;
1290         u32 changed = 0;
1291         int i, j;
1292         bool have_higher_than_11mbit = false, newsta = false;
1293         u16 ap_ht_cap_flags;
1294
1295         /* AssocResp and ReassocResp have identical structure, so process both
1296          * of them in this function. */
1297
1298         if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1299                 return;
1300
1301         if (len < 24 + 6)
1302                 return;
1303
1304         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1305                 return;
1306
1307         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1308         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1309         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1310
1311         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1312                "status=%d aid=%d)\n",
1313                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1314                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1315
1316         pos = mgmt->u.assoc_resp.variable;
1317         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1318
1319         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1320             elems.timeout_int && elems.timeout_int_len == 5 &&
1321             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1322                 u32 tu, ms;
1323                 tu = get_unaligned_le32(elems.timeout_int + 1);
1324                 ms = tu * 1024 / 1000;
1325                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1326                        "comeback duration %u TU (%u ms)\n",
1327                        sdata->dev->name, tu, ms);
1328                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1329                         mod_timer(&ifsta->timer,
1330                                   jiffies + msecs_to_jiffies(ms));
1331                 return;
1332         }
1333
1334         if (status_code != WLAN_STATUS_SUCCESS) {
1335                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1336                        sdata->dev->name, status_code);
1337                 /* if this was a reassociation, ensure we try a "full"
1338                  * association next time. This works around some broken APs
1339                  * which do not correctly reject reassociation requests. */
1340                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1341                 return;
1342         }
1343
1344         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1345                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1346                        "set\n", sdata->dev->name, aid);
1347         aid &= ~(BIT(15) | BIT(14));
1348
1349         if (!elems.supp_rates) {
1350                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1351                        sdata->dev->name);
1352                 return;
1353         }
1354
1355         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1356         ifsta->aid = aid;
1357         ifsta->ap_capab = capab_info;
1358
1359         kfree(ifsta->assocresp_ies);
1360         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1361         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1362         if (ifsta->assocresp_ies)
1363                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1364
1365         rcu_read_lock();
1366
1367         /* Add STA entry for the AP */
1368         sta = sta_info_get(local, ifsta->bssid);
1369         if (!sta) {
1370                 struct ieee80211_bss *bss;
1371
1372                 newsta = true;
1373
1374                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1375                 if (!sta) {
1376                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1377                                " the AP\n", sdata->dev->name);
1378                         rcu_read_unlock();
1379                         return;
1380                 }
1381                 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1382                                            local->hw.conf.channel->center_freq,
1383                                            ifsta->ssid, ifsta->ssid_len);
1384                 if (bss) {
1385                         sta->last_signal = bss->signal;
1386                         sta->last_qual = bss->qual;
1387                         sta->last_noise = bss->noise;
1388                         ieee80211_rx_bss_put(local, bss);
1389                 }
1390
1391                 /* update new sta with its last rx activity */
1392                 sta->last_rx = jiffies;
1393         }
1394
1395         /*
1396          * FIXME: Do we really need to update the sta_info's information here?
1397          *        We already know about the AP (we found it in our list) so it
1398          *        should already be filled with the right info, no?
1399          *        As is stands, all this is racy because typically we assume
1400          *        the information that is filled in here (except flags) doesn't
1401          *        change while a STA structure is alive. As such, it should move
1402          *        to between the sta_info_alloc() and sta_info_insert() above.
1403          */
1404
1405         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1406                            WLAN_STA_AUTHORIZED);
1407
1408         rates = 0;
1409         basic_rates = 0;
1410         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1411
1412         for (i = 0; i < elems.supp_rates_len; i++) {
1413                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1414                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1415
1416                 if (rate > 110)
1417                         have_higher_than_11mbit = true;
1418
1419                 for (j = 0; j < sband->n_bitrates; j++) {
1420                         if (sband->bitrates[j].bitrate == rate) {
1421                                 rates |= BIT(j);
1422                                 if (is_basic)
1423                                         basic_rates |= BIT(j);
1424                                 break;
1425                         }
1426                 }
1427         }
1428
1429         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1430                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1431                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1432
1433                 if (rate > 110)
1434                         have_higher_than_11mbit = true;
1435
1436                 for (j = 0; j < sband->n_bitrates; j++) {
1437                         if (sband->bitrates[j].bitrate == rate) {
1438                                 rates |= BIT(j);
1439                                 if (is_basic)
1440                                         basic_rates |= BIT(j);
1441                                 break;
1442                         }
1443                 }
1444         }
1445
1446         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1447         sdata->vif.bss_conf.basic_rates = basic_rates;
1448
1449         /* cf. IEEE 802.11 9.2.12 */
1450         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1451             have_higher_than_11mbit)
1452                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1453         else
1454                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1455
1456         if (elems.ht_cap_elem)
1457                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1458                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1459
1460         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1461
1462         rate_control_rate_init(sta);
1463
1464         if (ifsta->flags & IEEE80211_STA_MFP_ENABLED)
1465                 set_sta_flags(sta, WLAN_STA_MFP);
1466
1467         if (elems.wmm_param)
1468                 set_sta_flags(sta, WLAN_STA_WME);
1469
1470         if (newsta) {
1471                 int err = sta_info_insert(sta);
1472                 if (err) {
1473                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1474                                " the AP (error %d)\n", sdata->dev->name, err);
1475                         rcu_read_unlock();
1476                         return;
1477                 }
1478         }
1479
1480         rcu_read_unlock();
1481
1482         if (elems.wmm_param)
1483                 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1484                                          elems.wmm_param_len);
1485
1486         if (elems.ht_info_elem && elems.wmm_param &&
1487             (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1488                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1489                                                ap_ht_cap_flags);
1490
1491         /* set AID and assoc capability,
1492          * ieee80211_set_associated() will tell the driver */
1493         bss_conf->aid = aid;
1494         bss_conf->assoc_capability = capab_info;
1495         ieee80211_set_associated(sdata, ifsta, changed);
1496
1497         ieee80211_associated(sdata, ifsta);
1498 }
1499
1500
1501 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1502                                    struct ieee80211_if_sta *ifsta,
1503                                    struct ieee80211_bss *bss)
1504 {
1505         struct ieee80211_local *local = sdata->local;
1506         int res, rates, i, j;
1507         struct sk_buff *skb;
1508         struct ieee80211_mgmt *mgmt;
1509         u8 *pos;
1510         struct ieee80211_supported_band *sband;
1511         union iwreq_data wrqu;
1512
1513         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400 +
1514                             sdata->u.sta.ie_proberesp_len);
1515         if (!skb) {
1516                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1517                        "response\n", sdata->dev->name);
1518                 return -ENOMEM;
1519         }
1520
1521         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1522
1523         /* Remove possible STA entries from other IBSS networks. */
1524         sta_info_flush_delayed(sdata);
1525
1526         if (local->ops->reset_tsf) {
1527                 /* Reset own TSF to allow time synchronization work. */
1528                 local->ops->reset_tsf(local_to_hw(local));
1529         }
1530         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1531         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1532         if (res)
1533                 return res;
1534
1535         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1536
1537         sdata->drop_unencrypted = bss->capability &
1538                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1539
1540         res = ieee80211_set_freq(sdata, bss->freq);
1541
1542         if (res)
1543                 return res;
1544
1545         /* Build IBSS probe response */
1546
1547         skb_reserve(skb, local->hw.extra_tx_headroom);
1548
1549         mgmt = (struct ieee80211_mgmt *)
1550                 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1551         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1552         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1553                                                 IEEE80211_STYPE_PROBE_RESP);
1554         memset(mgmt->da, 0xff, ETH_ALEN);
1555         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1556         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1557         mgmt->u.beacon.beacon_int =
1558                 cpu_to_le16(local->hw.conf.beacon_int);
1559         mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1560         mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1561
1562         pos = skb_put(skb, 2 + ifsta->ssid_len);
1563         *pos++ = WLAN_EID_SSID;
1564         *pos++ = ifsta->ssid_len;
1565         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1566
1567         rates = bss->supp_rates_len;
1568         if (rates > 8)
1569                 rates = 8;
1570         pos = skb_put(skb, 2 + rates);
1571         *pos++ = WLAN_EID_SUPP_RATES;
1572         *pos++ = rates;
1573         memcpy(pos, bss->supp_rates, rates);
1574
1575         if (bss->band == IEEE80211_BAND_2GHZ) {
1576                 pos = skb_put(skb, 2 + 1);
1577                 *pos++ = WLAN_EID_DS_PARAMS;
1578                 *pos++ = 1;
1579                 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1580         }
1581
1582         pos = skb_put(skb, 2 + 2);
1583         *pos++ = WLAN_EID_IBSS_PARAMS;
1584         *pos++ = 2;
1585         /* FIX: set ATIM window based on scan results */
1586         *pos++ = 0;
1587         *pos++ = 0;
1588
1589         if (bss->supp_rates_len > 8) {
1590                 rates = bss->supp_rates_len - 8;
1591                 pos = skb_put(skb, 2 + rates);
1592                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1593                 *pos++ = rates;
1594                 memcpy(pos, &bss->supp_rates[8], rates);
1595         }
1596
1597         add_extra_ies(skb, sdata->u.sta.ie_proberesp,
1598                       sdata->u.sta.ie_proberesp_len);
1599
1600         ifsta->probe_resp = skb;
1601
1602         ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1603
1604
1605         rates = 0;
1606         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1607         for (i = 0; i < bss->supp_rates_len; i++) {
1608                 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1609                 for (j = 0; j < sband->n_bitrates; j++)
1610                         if (sband->bitrates[j].bitrate == bitrate)
1611                                 rates |= BIT(j);
1612         }
1613         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1614
1615         ieee80211_sta_def_wmm_params(sdata, bss);
1616
1617         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1618         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1619
1620         ieee80211_led_assoc(local, true);
1621
1622         memset(&wrqu, 0, sizeof(wrqu));
1623         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1624         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1625
1626         return res;
1627 }
1628
1629 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1630                                   struct ieee80211_mgmt *mgmt,
1631                                   size_t len,
1632                                   struct ieee80211_rx_status *rx_status,
1633                                   struct ieee802_11_elems *elems,
1634                                   bool beacon)
1635 {
1636         struct ieee80211_local *local = sdata->local;
1637         int freq;
1638         struct ieee80211_bss *bss;
1639         struct sta_info *sta;
1640         struct ieee80211_channel *channel;
1641         u64 beacon_timestamp, rx_timestamp;
1642         u32 supp_rates = 0;
1643         enum ieee80211_band band = rx_status->band;
1644
1645         if (elems->ds_params && elems->ds_params_len == 1)
1646                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1647         else
1648                 freq = rx_status->freq;
1649
1650         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1651
1652         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1653                 return;
1654
1655         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1656             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1657                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1658
1659                 rcu_read_lock();
1660
1661                 sta = sta_info_get(local, mgmt->sa);
1662                 if (sta) {
1663                         u32 prev_rates;
1664
1665                         prev_rates = sta->sta.supp_rates[band];
1666                         /* make sure mandatory rates are always added */
1667                         sta->sta.supp_rates[band] = supp_rates |
1668                                 ieee80211_mandatory_rates(local, band);
1669
1670 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1671                         if (sta->sta.supp_rates[band] != prev_rates)
1672                                 printk(KERN_DEBUG "%s: updated supp_rates set "
1673                                     "for %pM based on beacon info (0x%llx | "
1674                                     "0x%llx -> 0x%llx)\n",
1675                                     sdata->dev->name,
1676                                     sta->sta.addr,
1677                                     (unsigned long long) prev_rates,
1678                                     (unsigned long long) supp_rates,
1679                                     (unsigned long long) sta->sta.supp_rates[band]);
1680 #endif
1681                 } else {
1682                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1683                 }
1684
1685                 rcu_read_unlock();
1686         }
1687
1688         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1689                                         freq, beacon);
1690         if (!bss)
1691                 return;
1692
1693         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1694             (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
1695                 struct ieee80211_channel_sw_ie *sw_elem =
1696                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1697                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1698         }
1699
1700         /* was just updated in ieee80211_bss_info_update */
1701         beacon_timestamp = bss->timestamp;
1702
1703         /*
1704          * In STA mode, the remaining parameters should not be overridden
1705          * by beacons because they're not necessarily accurate there.
1706          */
1707         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1708             bss->last_probe_resp && beacon) {
1709                 ieee80211_rx_bss_put(local, bss);
1710                 return;
1711         }
1712
1713         /* check if we need to merge IBSS */
1714         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1715             (!(sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)) &&
1716             bss->capability & WLAN_CAPABILITY_IBSS &&
1717             bss->freq == local->oper_channel->center_freq &&
1718             elems->ssid_len == sdata->u.sta.ssid_len &&
1719             memcmp(elems->ssid, sdata->u.sta.ssid,
1720                                 sdata->u.sta.ssid_len) == 0) {
1721                 if (rx_status->flag & RX_FLAG_TSFT) {
1722                         /* in order for correct IBSS merging we need mactime
1723                          *
1724                          * since mactime is defined as the time the first data
1725                          * symbol of the frame hits the PHY, and the timestamp
1726                          * of the beacon is defined as "the time that the data
1727                          * symbol containing the first bit of the timestamp is
1728                          * transmitted to the PHY plus the transmitting STA’s
1729                          * delays through its local PHY from the MAC-PHY
1730                          * interface to its interface with the WM"
1731                          * (802.11 11.1.2) - equals the time this bit arrives at
1732                          * the receiver - we have to take into account the
1733                          * offset between the two.
1734                          * e.g: at 1 MBit that means mactime is 192 usec earlier
1735                          * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1736                          */
1737                         int rate;
1738                         if (rx_status->flag & RX_FLAG_HT) {
1739                                 rate = 65; /* TODO: HT rates */
1740                         } else {
1741                                 rate = local->hw.wiphy->bands[band]->
1742                                         bitrates[rx_status->rate_idx].bitrate;
1743                         }
1744                         rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1745                 } else if (local && local->ops && local->ops->get_tsf)
1746                         /* second best option: get current TSF */
1747                         rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1748                 else
1749                         /* can't merge without knowing the TSF */
1750                         rx_timestamp = -1LLU;
1751 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1752                 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1753                        "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1754                        mgmt->sa, mgmt->bssid,
1755                        (unsigned long long)rx_timestamp,
1756                        (unsigned long long)beacon_timestamp,
1757                        (unsigned long long)(rx_timestamp - beacon_timestamp),
1758                        jiffies);
1759 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1760                 if (beacon_timestamp > rx_timestamp) {
1761 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1762                         printk(KERN_DEBUG "%s: beacon TSF higher than "
1763                                "local TSF - IBSS merge with BSSID %pM\n",
1764                                sdata->dev->name, mgmt->bssid);
1765 #endif
1766                         ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1767                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1768                 }
1769         }
1770
1771         ieee80211_rx_bss_put(local, bss);
1772 }
1773
1774
1775 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1776                                          struct ieee80211_mgmt *mgmt,
1777                                          size_t len,
1778                                          struct ieee80211_rx_status *rx_status)
1779 {
1780         size_t baselen;
1781         struct ieee802_11_elems elems;
1782         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1783
1784         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1785                 return; /* ignore ProbeResp to foreign address */
1786
1787         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1788         if (baselen > len)
1789                 return;
1790
1791         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1792                                 &elems);
1793
1794         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1795
1796         /* direct probe may be part of the association flow */
1797         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1798                                                         &ifsta->request)) {
1799                 printk(KERN_DEBUG "%s direct probe responded\n",
1800                        sdata->dev->name);
1801                 ieee80211_authenticate(sdata, ifsta);
1802         }
1803 }
1804
1805
1806 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1807                                      struct ieee80211_mgmt *mgmt,
1808                                      size_t len,
1809                                      struct ieee80211_rx_status *rx_status)
1810 {
1811         struct ieee80211_if_sta *ifsta;
1812         size_t baselen;
1813         struct ieee802_11_elems elems;
1814         struct ieee80211_local *local = sdata->local;
1815         u32 changed = 0;
1816         bool erp_valid, directed_tim, is_mc = false;
1817         u8 erp_value = 0;
1818
1819         /* Process beacon from the current BSS */
1820         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1821         if (baselen > len)
1822                 return;
1823
1824         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1825
1826         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1827
1828         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1829                 return;
1830         ifsta = &sdata->u.sta;
1831
1832         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1833             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1834                 return;
1835
1836         if (rx_status->freq != local->hw.conf.channel->center_freq)
1837                 return;
1838
1839         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1840                                  elems.wmm_param_len);
1841
1842         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK &&
1843             local->hw.conf.flags & IEEE80211_CONF_PS) {
1844                 directed_tim = check_tim(&elems, ifsta->aid, &is_mc);
1845
1846                 if (directed_tim || is_mc) {
1847                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1848                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1849                         ieee80211_send_nullfunc(local, sdata, 0);
1850                 }
1851         }
1852
1853         if (elems.erp_info && elems.erp_info_len >= 1) {
1854                 erp_valid = true;
1855                 erp_value = elems.erp_info[0];
1856         } else {
1857                 erp_valid = false;
1858         }
1859         changed |= ieee80211_handle_bss_capability(sdata,
1860                         le16_to_cpu(mgmt->u.beacon.capab_info),
1861                         erp_valid, erp_value);
1862
1863
1864         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1865                 struct sta_info *sta;
1866                 struct ieee80211_supported_band *sband;
1867                 u16 ap_ht_cap_flags;
1868
1869                 rcu_read_lock();
1870
1871                 sta = sta_info_get(local, ifsta->bssid);
1872                 if (!sta) {
1873                         rcu_read_unlock();
1874                         return;
1875                 }
1876
1877                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1878
1879                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1880                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1881
1882                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1883
1884                 rcu_read_unlock();
1885
1886                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1887                                                ap_ht_cap_flags);
1888         }
1889
1890         if (elems.country_elem) {
1891                 /* Note we are only reviewing this on beacons
1892                  * for the BSSID we are associated to */
1893                 regulatory_hint_11d(local->hw.wiphy,
1894                         elems.country_elem, elems.country_elem_len);
1895
1896                 /* TODO: IBSS also needs this */
1897                 if (elems.pwr_constr_elem)
1898                         ieee80211_handle_pwr_constr(sdata,
1899                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1900                                 elems.pwr_constr_elem,
1901                                 elems.pwr_constr_elem_len);
1902         }
1903
1904         ieee80211_bss_info_change_notify(sdata, changed);
1905 }
1906
1907
1908 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1909                                         struct ieee80211_if_sta *ifsta,
1910                                         struct ieee80211_mgmt *mgmt,
1911                                         size_t len)
1912 {
1913         struct ieee80211_local *local = sdata->local;
1914         int tx_last_beacon;
1915         struct sk_buff *skb;
1916         struct ieee80211_mgmt *resp;
1917         u8 *pos, *end;
1918
1919         if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1920             ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1921             len < 24 + 2 || !ifsta->probe_resp)
1922                 return;
1923
1924         if (local->ops->tx_last_beacon)
1925                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1926         else
1927                 tx_last_beacon = 1;
1928
1929 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1930         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1931                " (tx_last_beacon=%d)\n",
1932                sdata->dev->name, mgmt->sa, mgmt->da,
1933                mgmt->bssid, tx_last_beacon);
1934 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1935
1936         if (!tx_last_beacon)
1937                 return;
1938
1939         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1940             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1941                 return;
1942
1943         end = ((u8 *) mgmt) + len;
1944         pos = mgmt->u.probe_req.variable;
1945         if (pos[0] != WLAN_EID_SSID ||
1946             pos + 2 + pos[1] > end) {
1947 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1948                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1949                        "from %pM\n",
1950                        sdata->dev->name, mgmt->sa);
1951 #endif
1952                 return;
1953         }
1954         if (pos[1] != 0 &&
1955             (pos[1] != ifsta->ssid_len ||
1956              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1957                 /* Ignore ProbeReq for foreign SSID */
1958                 return;
1959         }
1960
1961         /* Reply with ProbeResp */
1962         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1963         if (!skb)
1964                 return;
1965
1966         resp = (struct ieee80211_mgmt *) skb->data;
1967         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1968 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1969         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1970                sdata->dev->name, resp->da);
1971 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1972         ieee80211_tx_skb(sdata, skb, 0);
1973 }
1974
1975 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1976                            struct ieee80211_rx_status *rx_status)
1977 {
1978         struct ieee80211_local *local = sdata->local;
1979         struct ieee80211_if_sta *ifsta;
1980         struct ieee80211_mgmt *mgmt;
1981         u16 fc;
1982
1983         if (skb->len < 24)
1984                 goto fail;
1985
1986         ifsta = &sdata->u.sta;
1987
1988         mgmt = (struct ieee80211_mgmt *) skb->data;
1989         fc = le16_to_cpu(mgmt->frame_control);
1990
1991         switch (fc & IEEE80211_FCTL_STYPE) {
1992         case IEEE80211_STYPE_PROBE_REQ:
1993         case IEEE80211_STYPE_PROBE_RESP:
1994         case IEEE80211_STYPE_BEACON:
1995                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1996         case IEEE80211_STYPE_AUTH:
1997         case IEEE80211_STYPE_ASSOC_RESP:
1998         case IEEE80211_STYPE_REASSOC_RESP:
1999         case IEEE80211_STYPE_DEAUTH:
2000         case IEEE80211_STYPE_DISASSOC:
2001                 skb_queue_tail(&ifsta->skb_queue, skb);
2002                 queue_work(local->hw.workqueue, &ifsta->work);
2003                 return;
2004         }
2005
2006  fail:
2007         kfree_skb(skb);
2008 }
2009
2010 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2011                                          struct sk_buff *skb)
2012 {
2013         struct ieee80211_rx_status *rx_status;
2014         struct ieee80211_if_sta *ifsta;
2015         struct ieee80211_mgmt *mgmt;
2016         u16 fc;
2017
2018         ifsta = &sdata->u.sta;
2019
2020         rx_status = (struct ieee80211_rx_status *) skb->cb;
2021         mgmt = (struct ieee80211_mgmt *) skb->data;
2022         fc = le16_to_cpu(mgmt->frame_control);
2023
2024         switch (fc & IEEE80211_FCTL_STYPE) {
2025         case IEEE80211_STYPE_PROBE_REQ:
2026                 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len);
2027                 break;
2028         case IEEE80211_STYPE_PROBE_RESP:
2029                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
2030                 break;
2031         case IEEE80211_STYPE_BEACON:
2032                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2033                 break;
2034         case IEEE80211_STYPE_AUTH:
2035                 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
2036                 break;
2037         case IEEE80211_STYPE_ASSOC_RESP:
2038                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
2039                 break;
2040         case IEEE80211_STYPE_REASSOC_RESP:
2041                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
2042                 break;
2043         case IEEE80211_STYPE_DEAUTH:
2044                 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
2045                 break;
2046         case IEEE80211_STYPE_DISASSOC:
2047                 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
2048                 break;
2049         }
2050
2051         kfree_skb(skb);
2052 }
2053
2054
2055 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
2056 {
2057         struct ieee80211_local *local = sdata->local;
2058         int active = 0;
2059         struct sta_info *sta;
2060
2061         rcu_read_lock();
2062
2063         list_for_each_entry_rcu(sta, &local->sta_list, list) {
2064                 if (sta->sdata == sdata &&
2065                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
2066                                jiffies)) {
2067                         active++;
2068                         break;
2069                 }
2070         }
2071
2072         rcu_read_unlock();
2073
2074         return active;
2075 }
2076
2077
2078 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
2079                                      struct ieee80211_if_sta *ifsta)
2080 {
2081         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2082
2083         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
2084         if (ieee80211_sta_active_ibss(sdata))
2085                 return;
2086
2087         if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
2088             (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
2089                 return;
2090
2091         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2092                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
2093         ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
2094 }
2095
2096
2097 static void ieee80211_sta_timer(unsigned long data)
2098 {
2099         struct ieee80211_sub_if_data *sdata =
2100                 (struct ieee80211_sub_if_data *) data;
2101         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2102         struct ieee80211_local *local = sdata->local;
2103
2104         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2105         queue_work(local->hw.workqueue, &ifsta->work);
2106 }
2107
2108 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
2109                                      struct ieee80211_if_sta *ifsta)
2110 {
2111         struct ieee80211_local *local = sdata->local;
2112
2113         if (local->ops->reset_tsf) {
2114                 /* Reset own TSF to allow time synchronization work. */
2115                 local->ops->reset_tsf(local_to_hw(local));
2116         }
2117
2118         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2119
2120
2121         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2122                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2123         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2124                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2125         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2126                 ifsta->auth_alg = WLAN_AUTH_LEAP;
2127         else
2128                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2129         ifsta->auth_transaction = -1;
2130         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2131         ifsta->assoc_scan_tries = 0;
2132         ifsta->direct_probe_tries = 0;
2133         ifsta->auth_tries = 0;
2134         ifsta->assoc_tries = 0;
2135         netif_tx_stop_all_queues(sdata->dev);
2136         netif_carrier_off(sdata->dev);
2137 }
2138
2139
2140 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2141                                     const char *ssid, int ssid_len)
2142 {
2143         int tmp, hidden_ssid;
2144
2145         if (ssid_len == ifsta->ssid_len &&
2146             !memcmp(ifsta->ssid, ssid, ssid_len))
2147                 return 1;
2148
2149         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2150                 return 0;
2151
2152         hidden_ssid = 1;
2153         tmp = ssid_len;
2154         while (tmp--) {
2155                 if (ssid[tmp] != '\0') {
2156                         hidden_ssid = 0;
2157                         break;
2158                 }
2159         }
2160
2161         if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
2162                 return 1;
2163
2164         if (ssid_len == 1 && ssid[0] == ' ')
2165                 return 1;
2166
2167         return 0;
2168 }
2169
2170 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2171                                      struct ieee80211_if_sta *ifsta)
2172 {
2173         struct ieee80211_local *local = sdata->local;
2174         struct ieee80211_bss *bss;
2175         struct ieee80211_supported_band *sband;
2176         u8 bssid[ETH_ALEN], *pos;
2177         int i;
2178         int ret;
2179
2180 #if 0
2181         /* Easier testing, use fixed BSSID. */
2182         memset(bssid, 0xfe, ETH_ALEN);
2183 #else
2184         /* Generate random, not broadcast, locally administered BSSID. Mix in
2185          * own MAC address to make sure that devices that do not have proper
2186          * random number generator get different BSSID. */
2187         get_random_bytes(bssid, ETH_ALEN);
2188         for (i = 0; i < ETH_ALEN; i++)
2189                 bssid[i] ^= sdata->dev->dev_addr[i];
2190         bssid[0] &= ~0x01;
2191         bssid[0] |= 0x02;
2192 #endif
2193
2194         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2195                sdata->dev->name, bssid);
2196
2197         bss = ieee80211_rx_bss_add(local, bssid,
2198                                    local->hw.conf.channel->center_freq,
2199                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2200         if (!bss)
2201                 return -ENOMEM;
2202
2203         bss->band = local->hw.conf.channel->band;
2204         sband = local->hw.wiphy->bands[bss->band];
2205
2206         if (local->hw.conf.beacon_int == 0)
2207                 local->hw.conf.beacon_int = 100;
2208         bss->beacon_int = local->hw.conf.beacon_int;
2209         bss->last_update = jiffies;
2210         bss->capability = WLAN_CAPABILITY_IBSS;
2211
2212         if (sdata->default_key)
2213                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2214         else
2215                 sdata->drop_unencrypted = 0;
2216
2217         bss->supp_rates_len = sband->n_bitrates;
2218         pos = bss->supp_rates;
2219         for (i = 0; i < sband->n_bitrates; i++) {
2220                 int rate = sband->bitrates[i].bitrate;
2221                 *pos++ = (u8) (rate / 5);
2222         }
2223
2224         ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2225         ieee80211_rx_bss_put(local, bss);
2226         return ret;
2227 }
2228
2229
2230 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2231                                    struct ieee80211_if_sta *ifsta)
2232 {
2233         struct ieee80211_local *local = sdata->local;
2234         struct ieee80211_bss *bss;
2235         int found = 0;
2236         u8 bssid[ETH_ALEN];
2237         int active_ibss;
2238
2239         if (ifsta->ssid_len == 0)
2240                 return -EINVAL;
2241
2242         active_ibss = ieee80211_sta_active_ibss(sdata);
2243 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2244         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2245                sdata->dev->name, active_ibss);
2246 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2247         spin_lock_bh(&local->bss_lock);
2248         list_for_each_entry(bss, &local->bss_list, list) {
2249                 if (ifsta->ssid_len != bss->ssid_len ||
2250                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2251                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2252                         continue;
2253 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2254                 printk(KERN_DEBUG "   bssid=%pM found\n", bss->bssid);
2255 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2256                 memcpy(bssid, bss->bssid, ETH_ALEN);
2257                 found = 1;
2258                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2259                         break;
2260         }
2261         spin_unlock_bh(&local->bss_lock);
2262
2263 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2264         if (found)
2265                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
2266                        "%pM\n", bssid, ifsta->bssid);
2267 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2268
2269         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2270                 int ret;
2271                 int search_freq;
2272
2273                 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2274                         search_freq = bss->freq;
2275                 else
2276                         search_freq = local->hw.conf.channel->center_freq;
2277
2278                 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2279                                            ifsta->ssid, ifsta->ssid_len);
2280                 if (!bss)
2281                         goto dont_join;
2282
2283                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2284                        " based on configured SSID\n",
2285                        sdata->dev->name, bssid);
2286                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2287                 ieee80211_rx_bss_put(local, bss);
2288                 return ret;
2289         }
2290
2291 dont_join:
2292 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2293         printk(KERN_DEBUG "   did not try to join ibss\n");
2294 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2295
2296         /* Selected IBSS not found in current scan results - try to scan */
2297         if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2298             !ieee80211_sta_active_ibss(sdata)) {
2299                 mod_timer(&ifsta->timer, jiffies +
2300                                       IEEE80211_IBSS_MERGE_INTERVAL);
2301         } else if (time_after(jiffies, local->last_scan_completed +
2302                               IEEE80211_SCAN_INTERVAL)) {
2303                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2304                        "join\n", sdata->dev->name);
2305                 return ieee80211_request_scan(sdata, ifsta->ssid,
2306                                               ifsta->ssid_len);
2307         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2308                 int interval = IEEE80211_SCAN_INTERVAL;
2309
2310                 if (time_after(jiffies, ifsta->ibss_join_req +
2311                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2312                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2313                             (!(local->oper_channel->flags &
2314                                         IEEE80211_CHAN_NO_IBSS)))
2315                                 return ieee80211_sta_create_ibss(sdata, ifsta);
2316                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2317                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
2318                                        " %d MHz\n", sdata->dev->name,
2319                                        local->hw.conf.channel->center_freq);
2320                         }
2321
2322                         /* No IBSS found - decrease scan interval and continue
2323                          * scanning. */
2324                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2325                 }
2326
2327                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2328                 mod_timer(&ifsta->timer, jiffies + interval);
2329                 return 0;
2330         }
2331
2332         return 0;
2333 }
2334
2335
2336 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2337                                      struct ieee80211_if_sta *ifsta)
2338 {
2339         struct ieee80211_local *local = sdata->local;
2340         struct ieee80211_bss *bss, *selected = NULL;
2341         int top_rssi = 0, freq;
2342
2343         spin_lock_bh(&local->bss_lock);
2344         freq = local->oper_channel->center_freq;
2345         list_for_each_entry(bss, &local->bss_list, list) {
2346                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2347                         continue;
2348
2349                 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2350                         IEEE80211_STA_AUTO_BSSID_SEL |
2351                         IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2352                     (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2353                      !!sdata->default_key))
2354                         continue;
2355
2356                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2357                     bss->freq != freq)
2358                         continue;
2359
2360                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2361                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2362                         continue;
2363
2364                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2365                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2366                         continue;
2367
2368                 if (!selected || top_rssi < bss->signal) {
2369                         selected = bss;
2370                         top_rssi = bss->signal;
2371                 }
2372         }
2373         if (selected)
2374                 atomic_inc(&selected->users);
2375         spin_unlock_bh(&local->bss_lock);
2376
2377         if (selected) {
2378                 ieee80211_set_freq(sdata, selected->freq);
2379                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2380                         ieee80211_sta_set_ssid(sdata, selected->ssid,
2381                                                selected->ssid_len);
2382                 ieee80211_sta_set_bssid(sdata, selected->bssid);
2383                 ieee80211_sta_def_wmm_params(sdata, selected);
2384                 if (sdata->u.sta.mfp == IEEE80211_MFP_REQUIRED)
2385                         sdata->u.sta.flags |= IEEE80211_STA_MFP_ENABLED;
2386                 else
2387                         sdata->u.sta.flags &= ~IEEE80211_STA_MFP_ENABLED;
2388
2389                 /* Send out direct probe if no probe resp was received or
2390                  * the one we have is outdated
2391                  */
2392                 if (!selected->last_probe_resp ||
2393                     time_after(jiffies, selected->last_probe_resp
2394                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2395                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2396                 else
2397                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2398
2399                 ieee80211_rx_bss_put(local, selected);
2400                 ieee80211_sta_reset_auth(sdata, ifsta);
2401                 return 0;
2402         } else {
2403                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2404                         ifsta->assoc_scan_tries++;
2405                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2406                                 ieee80211_start_scan(sdata, NULL, 0);
2407                         else
2408                                 ieee80211_start_scan(sdata, ifsta->ssid,
2409                                                          ifsta->ssid_len);
2410                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2411                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2412                 } else
2413                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
2414         }
2415         return -1;
2416 }
2417
2418
2419 static void ieee80211_sta_work(struct work_struct *work)
2420 {
2421         struct ieee80211_sub_if_data *sdata =
2422                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2423         struct ieee80211_local *local = sdata->local;
2424         struct ieee80211_if_sta *ifsta;
2425         struct sk_buff *skb;
2426
2427         if (!netif_running(sdata->dev))
2428                 return;
2429
2430         if (local->sw_scanning || local->hw_scanning)
2431                 return;
2432
2433         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2434                     sdata->vif.type != NL80211_IFTYPE_ADHOC))
2435                 return;
2436         ifsta = &sdata->u.sta;
2437
2438         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2439                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2440
2441         if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2442             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2443             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2444             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2445                 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2446                                      ifsta->scan_ssid_len);
2447                 return;
2448         }
2449
2450         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2451                 if (ieee80211_sta_config_auth(sdata, ifsta))
2452                         return;
2453                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2454         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2455                 return;
2456
2457         switch (ifsta->state) {
2458         case IEEE80211_STA_MLME_DISABLED:
2459                 break;
2460         case IEEE80211_STA_MLME_DIRECT_PROBE:
2461                 ieee80211_direct_probe(sdata, ifsta);
2462                 break;
2463         case IEEE80211_STA_MLME_AUTHENTICATE:
2464                 ieee80211_authenticate(sdata, ifsta);
2465                 break;
2466         case IEEE80211_STA_MLME_ASSOCIATE:
2467                 ieee80211_associate(sdata, ifsta);
2468                 break;
2469         case IEEE80211_STA_MLME_ASSOCIATED:
2470                 ieee80211_associated(sdata, ifsta);
2471                 break;
2472         case IEEE80211_STA_MLME_IBSS_SEARCH:
2473                 ieee80211_sta_find_ibss(sdata, ifsta);
2474                 break;
2475         case IEEE80211_STA_MLME_IBSS_JOINED:
2476                 ieee80211_sta_merge_ibss(sdata, ifsta);
2477                 break;
2478         default:
2479                 WARN_ON(1);
2480                 break;
2481         }
2482
2483         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2484                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2485                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2486
2487                 ieee80211_set_disassoc(sdata, ifsta, false, true,
2488                                         WLAN_REASON_UNSPECIFIED);
2489         }
2490 }
2491
2492 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2493 {
2494         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2495                 queue_work(sdata->local->hw.workqueue,
2496                            &sdata->u.sta.work);
2497 }
2498
2499 /* interface setup */
2500 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2501 {
2502         struct ieee80211_if_sta *ifsta;
2503
2504         ifsta = &sdata->u.sta;
2505         INIT_WORK(&ifsta->work, ieee80211_sta_work);
2506         INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
2507         setup_timer(&ifsta->timer, ieee80211_sta_timer,
2508                     (unsigned long) sdata);
2509         setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
2510                     (unsigned long) sdata);
2511         skb_queue_head_init(&ifsta->skb_queue);
2512
2513         ifsta->capab = WLAN_CAPABILITY_ESS;
2514         ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2515                 IEEE80211_AUTH_ALG_SHARED_KEY;
2516         ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2517                 IEEE80211_STA_AUTO_BSSID_SEL |
2518                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2519         if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2520                 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2521 }
2522
2523 /*
2524  * Add a new IBSS station, will also be called by the RX code when,
2525  * in IBSS mode, receiving a frame from a yet-unknown station, hence
2526  * must be callable in atomic context.
2527  */
2528 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2529                                         u8 *bssid,u8 *addr, u32 supp_rates)
2530 {
2531         struct ieee80211_local *local = sdata->local;
2532         struct sta_info *sta;
2533         int band = local->hw.conf.channel->band;
2534
2535         /* TODO: Could consider removing the least recently used entry and
2536          * allow new one to be added. */
2537         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2538                 if (net_ratelimit()) {
2539                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2540                                "entry %pM\n", sdata->dev->name, addr);
2541                 }
2542                 return NULL;
2543         }
2544
2545         if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2546                 return NULL;
2547
2548 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2549         printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2550                wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2551 #endif
2552
2553         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2554         if (!sta)
2555                 return NULL;
2556
2557         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2558
2559         /* make sure mandatory rates are always added */
2560         sta->sta.supp_rates[band] = supp_rates |
2561                         ieee80211_mandatory_rates(local, band);
2562
2563         rate_control_rate_init(sta);
2564
2565         if (sta_info_insert(sta))
2566                 return NULL;
2567
2568         return sta;
2569 }
2570
2571 /* configuration hooks */
2572 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2573                             struct ieee80211_if_sta *ifsta)
2574 {
2575         struct ieee80211_local *local = sdata->local;
2576
2577         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2578                 return;
2579
2580         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2581                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2582             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2583                              IEEE80211_STA_AUTO_SSID_SEL))) {
2584
2585                 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2586                         ieee80211_set_disassoc(sdata, ifsta, true, true,
2587                                                WLAN_REASON_DEAUTH_LEAVING);
2588
2589                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2590                 queue_work(local->hw.workqueue, &ifsta->work);
2591         }
2592 }
2593
2594 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2595 {
2596         struct ieee80211_if_sta *ifsta;
2597
2598         if (len > IEEE80211_MAX_SSID_LEN)
2599                 return -EINVAL;
2600
2601         ifsta = &sdata->u.sta;
2602
2603         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2604                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2605                 memcpy(ifsta->ssid, ssid, len);
2606                 ifsta->ssid_len = len;
2607                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2608         }
2609
2610         if (len)
2611                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2612         else
2613                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2614
2615         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2616             !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2617                 ifsta->ibss_join_req = jiffies;
2618                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2619                 return ieee80211_sta_find_ibss(sdata, ifsta);
2620         }
2621
2622         return 0;
2623 }
2624
2625 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2626 {
2627         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2628         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2629         *len = ifsta->ssid_len;
2630         return 0;
2631 }
2632
2633 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2634 {
2635         struct ieee80211_if_sta *ifsta;
2636         int res;
2637         bool valid;
2638
2639         ifsta = &sdata->u.sta;
2640         valid = is_valid_ether_addr(bssid);
2641
2642         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2643                 if(valid)
2644                         memcpy(ifsta->bssid, bssid, ETH_ALEN);
2645                 else
2646                         memset(ifsta->bssid, 0, ETH_ALEN);
2647                 res = 0;
2648                 /*
2649                  * Hack! See also ieee80211_sta_set_ssid.
2650                  */
2651                 if (netif_running(sdata->dev))
2652                         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2653                 if (res) {
2654                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2655                                "the low-level driver\n", sdata->dev->name);
2656                         return res;
2657                 }
2658         }
2659
2660         if (valid)
2661                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2662         else
2663                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2664
2665         return 0;
2666 }
2667
2668 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2669 {
2670         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2671
2672         kfree(ifsta->extra_ie);
2673         if (len == 0) {
2674                 ifsta->extra_ie = NULL;
2675                 ifsta->extra_ie_len = 0;
2676                 return 0;
2677         }
2678         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2679         if (!ifsta->extra_ie) {
2680                 ifsta->extra_ie_len = 0;
2681                 return -ENOMEM;
2682         }
2683         memcpy(ifsta->extra_ie, ie, len);
2684         ifsta->extra_ie_len = len;
2685         return 0;
2686 }
2687
2688 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2689 {
2690         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2691
2692         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2693                sdata->dev->name, reason);
2694
2695         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2696             sdata->vif.type != NL80211_IFTYPE_ADHOC)
2697                 return -EINVAL;
2698
2699         ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2700         return 0;
2701 }
2702
2703 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2704 {
2705         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2706
2707         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2708                sdata->dev->name, reason);
2709
2710         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2711                 return -EINVAL;
2712
2713         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2714                 return -1;
2715
2716         ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2717         return 0;
2718 }
2719
2720 /* scan finished notification */
2721 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2722 {
2723         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2724         struct ieee80211_if_sta *ifsta;
2725
2726         if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2727                 ifsta = &sdata->u.sta;
2728                 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2729                     (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2730                     !ieee80211_sta_active_ibss(sdata)))
2731                         ieee80211_sta_find_ibss(sdata, ifsta);
2732         }
2733
2734         /* Restart STA timers */
2735         rcu_read_lock();
2736         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2737                 ieee80211_restart_sta_timer(sdata);
2738         rcu_read_unlock();
2739 }
2740
2741 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2742 {
2743         struct ieee80211_local *local =
2744                 container_of(work, struct ieee80211_local,
2745                              dynamic_ps_disable_work);
2746
2747         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2748                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2749                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2750         }
2751
2752         ieee80211_wake_queues_by_reason(&local->hw,
2753                                         IEEE80211_QUEUE_STOP_REASON_PS);
2754 }
2755
2756 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2757 {
2758         struct ieee80211_local *local =
2759                 container_of(work, struct ieee80211_local,
2760                              dynamic_ps_enable_work);
2761         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2762
2763         if (local->hw.conf.flags & IEEE80211_CONF_PS)
2764                 return;
2765
2766         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2767                 ieee80211_send_nullfunc(local, sdata, 1);
2768
2769         local->hw.conf.flags |= IEEE80211_CONF_PS;
2770         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2771 }
2772
2773 void ieee80211_dynamic_ps_timer(unsigned long data)
2774 {
2775         struct ieee80211_local *local = (void *) data;
2776
2777         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2778 }