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

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/wireless.h>
  19 #include <linux/random.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <net/iw_handler.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "rate.h"
  28 #include "led.h"
  29
  30 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
  31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  32 #define IEEE80211_AUTH_MAX_TRIES 3
  33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  34 #define IEEE80211_ASSOC_MAX_TRIES 3
  35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  36 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
  37 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  38 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  39 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
  40 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  41
  42 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  43 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  44
  45 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  46
  47
  48 /* utils */
  49 static int ecw2cw(int ecw)
  50 {
  51         return (1 << ecw) - 1;
  52 }
  53
  54 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  55 {
  56         u8 *end, *pos;
  57
  58         pos = bss->ies;
  59         if (pos == NULL)
  60                 return NULL;
  61         end = pos + bss->ies_len;
  62
  63         while (pos + 1 < end) {
  64                 if (pos + 2 + pos[1] > end)
  65                         break;
  66                 if (pos[0] == ie)
  67                         return pos;
  68                 pos += 2 + pos[1];
  69         }
  70
  71         return NULL;
  72 }
  73
  74 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  75                                       struct ieee80211_supported_band *sband,
  76                                       u32 *rates)
  77 {
  78         int i, j, count;
  79         *rates = 0;
  80         count = 0;
  81         for (i = 0; i < bss->supp_rates_len; i++) {
  82                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  83
  84                 for (j = 0; j < sband->n_bitrates; j++)
  85                         if (sband->bitrates[j].bitrate == rate) {
  86                                 *rates |= BIT(j);
  87                                 count++;
  88                                 break;
  89                         }
  90         }
  91
  92         return count;
  93 }
  94
  95 /* also used by mesh code */
  96 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
  97                             struct ieee802_11_elems *elems,
  98                             enum ieee80211_band band)
  99 {
 100         struct ieee80211_supported_band *sband;
 101         struct ieee80211_rate *bitrates;
 102         size_t num_rates;
 103         u32 supp_rates;
 104         int i, j;
 105         sband = local->hw.wiphy->bands[band];
 106
 107         if (!sband) {
 108                 WARN_ON(1);
 109                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 110         }
 111
 112         bitrates = sband->bitrates;
 113         num_rates = sband->n_bitrates;
 114         supp_rates = 0;
 115         for (i = 0; i < elems->supp_rates_len +
 116                      elems->ext_supp_rates_len; i++) {
 117                 u8 rate = 0;
 118                 int own_rate;
 119                 if (i < elems->supp_rates_len)
 120                         rate = elems->supp_rates[i];
 121                 else if (elems->ext_supp_rates)
 122                         rate = elems->ext_supp_rates
 123                                 [i - elems->supp_rates_len];
 124                 own_rate = 5 * (rate & 0x7f);
 125                 for (j = 0; j < num_rates; j++)
 126                         if (bitrates[j].bitrate == own_rate)
 127                                 supp_rates |= BIT(j);
 128         }
 129         return supp_rates;
 130 }
 131
 132 /* frame sending functions */
 133
 134 static void add_extra_ies(struct sk_buff *skb, u8 *ies, size_t ies_len)
 135 {
 136         if (ies)
 137                 memcpy(skb_put(skb, ies_len), ies, ies_len);
 138 }
 139
 140 /* also used by scanning code */
 141 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 142                               u8 *ssid, size_t ssid_len)
 143 {
 144         struct ieee80211_local *local = sdata->local;
 145         struct ieee80211_supported_band *sband;
 146         struct sk_buff *skb;
 147         struct ieee80211_mgmt *mgmt;
 148         u8 *pos, *supp_rates, *esupp_rates = NULL;
 149         int i;
 150
 151         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
 152                             sdata->u.sta.ie_probereq_len);
 153         if (!skb) {
 154                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 155                        "request\n", sdata->dev->name);
 156                 return;
 157         }
 158         skb_reserve(skb, local->hw.extra_tx_headroom);
 159
 160         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 161         memset(mgmt, 0, 24);
 162         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 163                                           IEEE80211_STYPE_PROBE_REQ);
 164         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 165         if (dst) {
 166                 memcpy(mgmt->da, dst, ETH_ALEN);
 167                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 168         } else {
 169                 memset(mgmt->da, 0xff, ETH_ALEN);
 170                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 171         }
 172         pos = skb_put(skb, 2 + ssid_len);
 173         *pos++ = WLAN_EID_SSID;
 174         *pos++ = ssid_len;
 175         memcpy(pos, ssid, ssid_len);
 176
 177         supp_rates = skb_put(skb, 2);
 178         supp_rates[0] = WLAN_EID_SUPP_RATES;
 179         supp_rates[1] = 0;
 180         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 181
 182         for (i = 0; i < sband->n_bitrates; i++) {
 183                 struct ieee80211_rate *rate = &sband->bitrates[i];
 184                 if (esupp_rates) {
 185                         pos = skb_put(skb, 1);
 186                         esupp_rates[1]++;
 187                 } else if (supp_rates[1] == 8) {
 188                         esupp_rates = skb_put(skb, 3);
 189                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 190                         esupp_rates[1] = 1;
 191                         pos = &esupp_rates[2];
 192                 } else {
 193                         pos = skb_put(skb, 1);
 194                         supp_rates[1]++;
 195                 }
 196                 *pos = rate->bitrate / 5;
 197         }
 198
 199         add_extra_ies(skb, sdata->u.sta.ie_probereq,
 200                       sdata->u.sta.ie_probereq_len);
 201
 202         ieee80211_tx_skb(sdata, skb, 0);
 203 }
 204
 205 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 206                                 struct ieee80211_if_sta *ifsta,
 207                                 int transaction, u8 *extra, size_t extra_len,
 208                                 int encrypt)
 209 {
 210         struct ieee80211_local *local = sdata->local;
 211         struct sk_buff *skb;
 212         struct ieee80211_mgmt *mgmt;
 213
 214         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 215                             sizeof(*mgmt) + 6 + extra_len +
 216                             sdata->u.sta.ie_auth_len);
 217         if (!skb) {
 218                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 219                        "frame\n", sdata->dev->name);
 220                 return;
 221         }
 222         skb_reserve(skb, local->hw.extra_tx_headroom);
 223
 224         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 225         memset(mgmt, 0, 24 + 6);
 226         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 227                                           IEEE80211_STYPE_AUTH);
 228         if (encrypt)
 229                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 230         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 231         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 232         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 233         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
 234         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 235         ifsta->auth_transaction = transaction + 1;
 236         mgmt->u.auth.status_code = cpu_to_le16(0);
 237         if (extra)
 238                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 239         add_extra_ies(skb, sdata->u.sta.ie_auth, sdata->u.sta.ie_auth_len);
 240
 241         ieee80211_tx_skb(sdata, skb, encrypt);
 242 }
 243
 244 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
 245                                  struct ieee80211_if_sta *ifsta)
 246 {
 247         struct ieee80211_local *local = sdata->local;
 248         struct sk_buff *skb;
 249         struct ieee80211_mgmt *mgmt;
 250         u8 *pos, *ies, *ht_ie, *e_ies;
 251         int i, len, count, rates_len, supp_rates_len;
 252         u16 capab;
 253         struct ieee80211_bss *bss;
 254         int wmm = 0;
 255         struct ieee80211_supported_band *sband;
 256         u32 rates = 0;
 257         size_t e_ies_len;
 258
 259         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 260                 e_ies = sdata->u.sta.ie_reassocreq;
 261                 e_ies_len = sdata->u.sta.ie_reassocreq_len;
 262         } else {
 263                 e_ies = sdata->u.sta.ie_assocreq;
 264                 e_ies_len = sdata->u.sta.ie_assocreq_len;
 265         }
 266
 267         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 268                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
 269                             ifsta->ssid_len + e_ies_len);
 270         if (!skb) {
 271                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 272                        "frame\n", sdata->dev->name);
 273                 return;
 274         }
 275         skb_reserve(skb, local->hw.extra_tx_headroom);
 276
 277         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 278
 279         capab = ifsta->capab;
 280
 281         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 282                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 283                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 284                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 285                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 286         }
 287
 288         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 289                                    local->hw.conf.channel->center_freq,
 290                                    ifsta->ssid, ifsta->ssid_len);
 291         if (bss) {
 292                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 293                         capab |= WLAN_CAPABILITY_PRIVACY;
 294                 if (bss->wmm_used)
 295                         wmm = 1;
 296
 297                 /* get all rates supported by the device and the AP as
 298                  * some APs don't like getting a superset of their rates
 299                  * in the association request (e.g. D-Link DAP 1353 in
 300                  * b-only mode) */
 301                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 302
 303                 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 304                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 305                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 306
 307                 ieee80211_rx_bss_put(local, bss);
 308         } else {
 309                 rates = ~0;
 310                 rates_len = sband->n_bitrates;
 311         }
 312
 313         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 314         memset(mgmt, 0, 24);
 315         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 316         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 317         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 318
 319         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 320                 skb_put(skb, 10);
 321                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 322                                                   IEEE80211_STYPE_REASSOC_REQ);
 323                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 324                 mgmt->u.reassoc_req.listen_interval =
 325                                 cpu_to_le16(local->hw.conf.listen_interval);
 326                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
 327                        ETH_ALEN);
 328         } else {
 329                 skb_put(skb, 4);
 330                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 331                                                   IEEE80211_STYPE_ASSOC_REQ);
 332                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 333                 mgmt->u.assoc_req.listen_interval =
 334                                 cpu_to_le16(local->hw.conf.listen_interval);
 335         }
 336
 337         /* SSID */
 338         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
 339         *pos++ = WLAN_EID_SSID;
 340         *pos++ = ifsta->ssid_len;
 341         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
 342
 343         /* add all rates which were marked to be used above */
 344         supp_rates_len = rates_len;
 345         if (supp_rates_len > 8)
 346                 supp_rates_len = 8;
 347
 348         len = sband->n_bitrates;
 349         pos = skb_put(skb, supp_rates_len + 2);
 350         *pos++ = WLAN_EID_SUPP_RATES;
 351         *pos++ = supp_rates_len;
 352
 353         count = 0;
 354         for (i = 0; i < sband->n_bitrates; i++) {
 355                 if (BIT(i) & rates) {
 356                         int rate = sband->bitrates[i].bitrate;
 357                         *pos++ = (u8) (rate / 5);
 358                         if (++count == 8)
 359                                 break;
 360                 }
 361         }
 362
 363         if (rates_len > count) {
 364                 pos = skb_put(skb, rates_len - count + 2);
 365                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 366                 *pos++ = rates_len - count;
 367
 368                 for (i++; i < sband->n_bitrates; i++) {
 369                         if (BIT(i) & rates) {
 370                                 int rate = sband->bitrates[i].bitrate;
 371                                 *pos++ = (u8) (rate / 5);
 372                         }
 373                 }
 374         }
 375
 376         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 377                 /* 1. power capabilities */
 378                 pos = skb_put(skb, 4);
 379                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 380                 *pos++ = 2;
 381                 *pos++ = 0; /* min tx power */
 382                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 383
 384                 /* 2. supported channels */
 385                 /* TODO: get this in reg domain format */
 386                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 387                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 388                 *pos++ = 2 * sband->n_channels;
 389                 for (i = 0; i < sband->n_channels; i++) {
 390                         *pos++ = ieee80211_frequency_to_channel(
 391                                         sband->channels[i].center_freq);
 392                         *pos++ = 1; /* one channel in the subband*/
 393                 }
 394         }
 395
 396         if (ifsta->extra_ie) {
 397                 pos = skb_put(skb, ifsta->extra_ie_len);
 398                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
 399         }
 400
 401         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
 402                 pos = skb_put(skb, 9);
 403                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 404                 *pos++ = 7; /* len */
 405                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 406                 *pos++ = 0x50;
 407                 *pos++ = 0xf2;
 408                 *pos++ = 2; /* WME */
 409                 *pos++ = 0; /* WME info */
 410                 *pos++ = 1; /* WME ver */
 411                 *pos++ = 0;
 412         }
 413
 414         /* wmm support is a must to HT */
 415         /*
 416          * IEEE802.11n does not allow TKIP/WEP as pairwise
 417          * ciphers in HT mode. We still associate in non-ht
 418          * mode (11a/b/g) if any one of these ciphers is
 419          * configured as pairwise.
 420          */
 421         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
 422             sband->ht_cap.ht_supported &&
 423             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
 424             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 425             (!(ifsta->flags & IEEE80211_STA_TKIP_WEP_USED))) {
 426                 struct ieee80211_ht_info *ht_info =
 427                         (struct ieee80211_ht_info *)(ht_ie + 2);
 428                 u16 cap = sband->ht_cap.cap;
 429                 __le16 tmp;
 430                 u32 flags = local->hw.conf.channel->flags;
 431
 432                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 433                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 434                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 435                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 436                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 437                         }
 438                         break;
 439                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 440                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 441                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 442                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 443                         }
 444                         break;
 445                 }
 446
 447                 tmp = cpu_to_le16(cap);
 448                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 449                 *pos++ = WLAN_EID_HT_CAPABILITY;
 450                 *pos++ = sizeof(struct ieee80211_ht_cap);
 451                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 452                 memcpy(pos, &tmp, sizeof(u16));
 453                 pos += sizeof(u16);
 454                 /* TODO: needs a define here for << 2 */
 455                 *pos++ = sband->ht_cap.ampdu_factor |
 456                          (sband->ht_cap.ampdu_density << 2);
 457                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 458         }
 459
 460         add_extra_ies(skb, e_ies, e_ies_len);
 461
 462         kfree(ifsta->assocreq_ies);
 463         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
 464         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
 465         if (ifsta->assocreq_ies)
 466                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
 467
 468         ieee80211_tx_skb(sdata, skb, 0);
 469 }
 470
 471
 472 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 473                                            u16 stype, u16 reason)
 474 {
 475         struct ieee80211_local *local = sdata->local;
 476         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 477         struct sk_buff *skb;
 478         struct ieee80211_mgmt *mgmt;
 479         u8 *ies;
 480         size_t ies_len;
 481
 482         if (stype == IEEE80211_STYPE_DEAUTH) {
 483                 ies = sdata->u.sta.ie_deauth;
 484                 ies_len = sdata->u.sta.ie_deauth_len;
 485         } else {
 486                 ies = sdata->u.sta.ie_disassoc;
 487                 ies_len = sdata->u.sta.ie_disassoc_len;
 488         }
 489
 490         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) +
 491                             ies_len);
 492         if (!skb) {
 493                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 494                        "deauth/disassoc frame\n", sdata->dev->name);
 495                 return;
 496         }
 497         skb_reserve(skb, local->hw.extra_tx_headroom);
 498
 499         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 500         memset(mgmt, 0, 24);
 501         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 502         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 503         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 504         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 505         skb_put(skb, 2);
 506         /* u.deauth.reason_code == u.disassoc.reason_code */
 507         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 508
 509         add_extra_ies(skb, ies, ies_len);
 510
 511         ieee80211_tx_skb(sdata, skb, ifsta->flags & IEEE80211_STA_MFP_ENABLED);
 512 }
 513
 514 /* MLME */
 515 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 516                                          struct ieee80211_bss *bss)
 517 {
 518         struct ieee80211_local *local = sdata->local;
 519         int i, have_higher_than_11mbit = 0;
 520
 521         /* cf. IEEE 802.11 9.2.12 */
 522         for (i = 0; i < bss->supp_rates_len; i++)
 523                 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
 524                         have_higher_than_11mbit = 1;
 525
 526         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 527             have_higher_than_11mbit)
 528                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 529         else
 530                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 531
 532         ieee80211_set_wmm_default(sdata);
 533 }
 534
 535 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 536                                      struct ieee80211_if_sta *ifsta,
 537                                      u8 *wmm_param, size_t wmm_param_len)
 538 {
 539         struct ieee80211_tx_queue_params params;
 540         size_t left;
 541         int count;
 542         u8 *pos;
 543
 544         if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
 545                 return;
 546
 547         if (!wmm_param)
 548                 return;
 549
 550         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 551                 return;
 552         count = wmm_param[6] & 0x0f;
 553         if (count == ifsta->wmm_last_param_set)
 554                 return;
 555         ifsta->wmm_last_param_set = count;
 556
 557         pos = wmm_param + 8;
 558         left = wmm_param_len - 8;
 559
 560         memset(&params, 0, sizeof(params));
 561
 562         if (!local->ops->conf_tx)
 563                 return;
 564
 565         local->wmm_acm = 0;
 566         for (; left >= 4; left -= 4, pos += 4) {
 567                 int aci = (pos[0] >> 5) & 0x03;
 568                 int acm = (pos[0] >> 4) & 0x01;
 569                 int queue;
 570
 571                 switch (aci) {
 572                 case 1:
 573                         queue = 3;
 574                         if (acm)
 575                                 local->wmm_acm |= BIT(0) | BIT(3);
 576                         break;
 577                 case 2:
 578                         queue = 1;
 579                         if (acm)
 580                                 local->wmm_acm |= BIT(4) | BIT(5);
 581                         break;
 582                 case 3:
 583                         queue = 0;
 584                         if (acm)
 585                                 local->wmm_acm |= BIT(6) | BIT(7);
 586                         break;
 587                 case 0:
 588                 default:
 589                         queue = 2;
 590                         if (acm)
 591                                 local->wmm_acm |= BIT(1) | BIT(2);
 592                         break;
 593                 }
 594
 595                 params.aifs = pos[0] & 0x0f;
 596                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 597                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 598                 params.txop = get_unaligned_le16(pos + 2);
 599 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 600                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 601                        "cWmin=%d cWmax=%d txop=%d\n",
 602                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 603                        params.cw_max, params.txop);
 604 #endif
 605                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
 606                  * AC for now) */
 607                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 608                         printk(KERN_DEBUG "%s: failed to set TX queue "
 609                                "parameters for queue %d\n", local->mdev->name, queue);
 610                 }
 611         }
 612 }
 613
 614 static bool check_tim(struct ieee802_11_elems *elems, u16 aid, bool *is_mc)
 615 {
 616         u8 mask;
 617         u8 index, indexn1, indexn2;
 618         struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
 619
 620         aid &= 0x3fff;
 621         index = aid / 8;
 622         mask  = 1 << (aid & 7);
 623
 624         if (tim->bitmap_ctrl & 0x01)
 625                 *is_mc = true;
 626
 627         indexn1 = tim->bitmap_ctrl & 0xfe;
 628         indexn2 = elems->tim_len + indexn1 - 4;
 629
 630         if (index < indexn1 || index > indexn2)
 631                 return false;
 632
 633         index -= indexn1;
 634
 635         return !!(tim->virtual_map[index] & mask);
 636 }
 637
 638 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 639                                            u16 capab, bool erp_valid, u8 erp)
 640 {
 641         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 642 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 643         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 644 #endif
 645         u32 changed = 0;
 646         bool use_protection;
 647         bool use_short_preamble;
 648         bool use_short_slot;
 649
 650         if (erp_valid) {
 651                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 652                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 653         } else {
 654                 use_protection = false;
 655                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 656         }
 657
 658         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 659
 660         if (use_protection != bss_conf->use_cts_prot) {
 661 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 662                 if (net_ratelimit()) {
 663                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 664                                sdata->dev->name,
 665                                use_protection ? "enabled" : "disabled",
 666                                ifsta->bssid);
 667                 }
 668 #endif
 669                 bss_conf->use_cts_prot = use_protection;
 670                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 671         }
 672
 673         if (use_short_preamble != bss_conf->use_short_preamble) {
 674 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 675                 if (net_ratelimit()) {
 676                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 677                                " (BSSID=%pM)\n",
 678                                sdata->dev->name,
 679                                use_short_preamble ? "short" : "long",
 680                                ifsta->bssid);
 681                 }
 682 #endif
 683                 bss_conf->use_short_preamble = use_short_preamble;
 684                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 685         }
 686
 687         if (use_short_slot != bss_conf->use_short_slot) {
 688 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 689                 if (net_ratelimit()) {
 690                         printk(KERN_DEBUG "%s: switched to %s slot time"
 691                                " (BSSID=%pM)\n",
 692                                sdata->dev->name,
 693                                use_short_slot ? "short" : "long",
 694                                ifsta->bssid);
 695                 }
 696 #endif
 697                 bss_conf->use_short_slot = use_short_slot;
 698                 changed |= BSS_CHANGED_ERP_SLOT;
 699         }
 700
 701         return changed;
 702 }
 703
 704 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
 705                                         struct ieee80211_if_sta *ifsta)
 706 {
 707         union iwreq_data wrqu;
 708         memset(&wrqu, 0, sizeof(wrqu));
 709         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
 710                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
 711         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 712         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 713 }
 714
 715 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
 716                                          struct ieee80211_if_sta *ifsta)
 717 {
 718         char *buf;
 719         size_t len;
 720         int i;
 721         union iwreq_data wrqu;
 722
 723         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
 724                 return;
 725
 726         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
 727                                 ifsta->assocresp_ies_len), GFP_KERNEL);
 728         if (!buf)
 729                 return;
 730
 731         len = sprintf(buf, "ASSOCINFO(");
 732         if (ifsta->assocreq_ies) {
 733                 len += sprintf(buf + len, "ReqIEs=");
 734                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
 735                         len += sprintf(buf + len, "%02x",
 736                                        ifsta->assocreq_ies[i]);
 737                 }
 738         }
 739         if (ifsta->assocresp_ies) {
 740                 if (ifsta->assocreq_ies)
 741                         len += sprintf(buf + len, " ");
 742                 len += sprintf(buf + len, "RespIEs=");
 743                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 744                         len += sprintf(buf + len, "%02x",
 745                                        ifsta->assocresp_ies[i]);
 746                 }
 747         }
 748         len += sprintf(buf + len, ")");
 749
 750         if (len > IW_CUSTOM_MAX) {
 751                 len = sprintf(buf, "ASSOCRESPIE=");
 752                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 753                         len += sprintf(buf + len, "%02x",
 754                                        ifsta->assocresp_ies[i]);
 755                 }
 756         }
 757
 758         if (len <= IW_CUSTOM_MAX) {
 759                 memset(&wrqu, 0, sizeof(wrqu));
 760                 wrqu.data.length = len;
 761                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 762         }
 763
 764         kfree(buf);
 765 }
 766
 767
 768 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 769                                      struct ieee80211_if_sta *ifsta,
 770                                      u32 bss_info_changed)
 771 {
 772         struct ieee80211_local *local = sdata->local;
 773         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 774
 775         struct ieee80211_bss *bss;
 776
 777         bss_info_changed |= BSS_CHANGED_ASSOC;
 778         ifsta->flags |= IEEE80211_STA_ASSOCIATED;
 779
 780         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 781                 return;
 782
 783         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 784                                    conf->channel->center_freq,
 785                                    ifsta->ssid, ifsta->ssid_len);
 786         if (bss) {
 787                 /* set timing information */
 788                 sdata->vif.bss_conf.beacon_int = bss->beacon_int;
 789                 sdata->vif.bss_conf.timestamp = bss->timestamp;
 790                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 791
 792                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 793                         bss->capability, bss->has_erp_value, bss->erp_value);
 794
 795                 ieee80211_rx_bss_put(local, bss);
 796         }
 797
 798         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
 799         memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 800         ieee80211_sta_send_associnfo(sdata, ifsta);
 801
 802         ifsta->last_probe = jiffies;
 803         ieee80211_led_assoc(local, 1);
 804
 805         sdata->vif.bss_conf.assoc = 1;
 806         /*
 807          * For now just always ask the driver to update the basic rateset
 808          * when we have associated, we aren't checking whether it actually
 809          * changed or not.
 810          */
 811         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 812         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 813
 814         if (local->powersave) {
 815                 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
 816                     local->hw.conf.dynamic_ps_timeout > 0) {
 817                         mod_timer(&local->dynamic_ps_timer, jiffies +
 818                                   msecs_to_jiffies(
 819                                         local->hw.conf.dynamic_ps_timeout));
 820                 } else {
 821                         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 822                                 ieee80211_send_nullfunc(local, sdata, 1);
 823                         conf->flags |= IEEE80211_CONF_PS;
 824                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 825                 }
 826         }
 827
 828         netif_tx_start_all_queues(sdata->dev);
 829         netif_carrier_on(sdata->dev);
 830
 831         ieee80211_sta_send_apinfo(sdata, ifsta);
 832 }
 833
 834 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
 835                                    struct ieee80211_if_sta *ifsta)
 836 {
 837         ifsta->direct_probe_tries++;
 838         if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 839                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 840                        sdata->dev->name, ifsta->bssid);
 841                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 842                 ieee80211_sta_send_apinfo(sdata, ifsta);
 843
 844                 /*
 845                  * Most likely AP is not in the range so remove the
 846                  * bss information associated to the AP
 847                  */
 848                 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
 849                                 sdata->local->hw.conf.channel->center_freq,
 850                                 ifsta->ssid, ifsta->ssid_len);
 851                 return;
 852         }
 853
 854         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 855                         sdata->dev->name, ifsta->bssid,
 856                         ifsta->direct_probe_tries);
 857
 858         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 859
 860         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
 861
 862         /* Direct probe is sent to broadcast address as some APs
 863          * will not answer to direct packet in unassociated state.
 864          */
 865         ieee80211_send_probe_req(sdata, NULL,
 866                                  ifsta->ssid, ifsta->ssid_len);
 867
 868         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 869 }
 870
 871
 872 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
 873                                    struct ieee80211_if_sta *ifsta)
 874 {
 875         ifsta->auth_tries++;
 876         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 877                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 878                        " timed out\n",
 879                        sdata->dev->name, ifsta->bssid);
 880                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 881                 ieee80211_sta_send_apinfo(sdata, ifsta);
 882                 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
 883                                 sdata->local->hw.conf.channel->center_freq,
 884                                 ifsta->ssid, ifsta->ssid_len);
 885                 return;
 886         }
 887
 888         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
 889         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 890                sdata->dev->name, ifsta->bssid);
 891
 892         ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
 893
 894         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 895 }
 896
 897 /*
 898  * The disassoc 'reason' argument can be either our own reason
 899  * if self disconnected or a reason code from the AP.
 900  */
 901 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 902                                    struct ieee80211_if_sta *ifsta, bool deauth,
 903                                    bool self_disconnected, u16 reason)
 904 {
 905         struct ieee80211_local *local = sdata->local;
 906         struct sta_info *sta;
 907         u32 changed = 0, config_changed = 0;
 908
 909         rcu_read_lock();
 910
 911         sta = sta_info_get(local, ifsta->bssid);
 912         if (!sta) {
 913                 rcu_read_unlock();
 914                 return;
 915         }
 916
 917         if (deauth) {
 918                 ifsta->direct_probe_tries = 0;
 919                 ifsta->auth_tries = 0;
 920         }
 921         ifsta->assoc_scan_tries = 0;
 922         ifsta->assoc_tries = 0;
 923
 924         netif_tx_stop_all_queues(sdata->dev);
 925         netif_carrier_off(sdata->dev);
 926
 927         ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
 928
 929         if (self_disconnected) {
 930                 if (deauth)
 931                         ieee80211_send_deauth_disassoc(sdata,
 932                                 IEEE80211_STYPE_DEAUTH, reason);
 933                 else
 934                         ieee80211_send_deauth_disassoc(sdata,
 935                                 IEEE80211_STYPE_DISASSOC, reason);
 936         }
 937
 938         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
 939         changed |= ieee80211_reset_erp_info(sdata);
 940
 941         ieee80211_led_assoc(local, 0);
 942         changed |= BSS_CHANGED_ASSOC;
 943         sdata->vif.bss_conf.assoc = false;
 944
 945         ieee80211_sta_send_apinfo(sdata, ifsta);
 946
 947         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
 948                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 949                 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
 950                                 sdata->local->hw.conf.channel->center_freq,
 951                                 ifsta->ssid, ifsta->ssid_len);
 952         }
 953
 954         rcu_read_unlock();
 955
 956         /* channel(_type) changes are handled by ieee80211_hw_config */
 957         local->oper_channel_type = NL80211_CHAN_NO_HT;
 958
 959         local->power_constr_level = 0;
 960
 961         del_timer_sync(&local->dynamic_ps_timer);
 962         cancel_work_sync(&local->dynamic_ps_enable_work);
 963
 964         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 965                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 966                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 967         }
 968
 969         ieee80211_hw_config(local, config_changed);
 970         ieee80211_bss_info_change_notify(sdata, changed);
 971
 972         rcu_read_lock();
 973
 974         sta = sta_info_get(local, ifsta->bssid);
 975         if (!sta) {
 976                 rcu_read_unlock();
 977                 return;
 978         }
 979
 980         sta_info_unlink(&sta);
 981
 982         rcu_read_unlock();
 983
 984         sta_info_destroy(sta);
 985 }
 986
 987 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
 988 {
 989         if (!sdata || !sdata->default_key ||
 990             sdata->default_key->conf.alg != ALG_WEP)
 991                 return 0;
 992         return 1;
 993 }
 994
 995 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
 996                                       struct ieee80211_if_sta *ifsta)
 997 {
 998         struct ieee80211_local *local = sdata->local;
 999         struct ieee80211_bss *bss;
1000         int bss_privacy;
1001         int wep_privacy;
1002         int privacy_invoked;
1003
1004         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
1005                 return 0;
1006
1007         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1008                                    local->hw.conf.channel->center_freq,
1009                                    ifsta->ssid, ifsta->ssid_len);
1010         if (!bss)
1011                 return 0;
1012
1013         bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
1014         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1015         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
1016
1017         ieee80211_rx_bss_put(local, bss);
1018
1019         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1020                 return 0;
1021
1022         return 1;
1023 }
1024
1025 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1026                                 struct ieee80211_if_sta *ifsta)
1027 {
1028         ifsta->assoc_tries++;
1029         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1030                 printk(KERN_DEBUG "%s: association with AP %pM"
1031                        " timed out\n",
1032                        sdata->dev->name, ifsta->bssid);
1033                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1034                 ieee80211_sta_send_apinfo(sdata, ifsta);
1035                 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
1036                                 sdata->local->hw.conf.channel->center_freq,
1037                                 ifsta->ssid, ifsta->ssid_len);
1038                 return;
1039         }
1040
1041         ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1042         printk(KERN_DEBUG "%s: associate with AP %pM\n",
1043                sdata->dev->name, ifsta->bssid);
1044         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
1045                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1046                        "mixed-cell disabled - abort association\n", sdata->dev->name);
1047                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1048                 return;
1049         }
1050
1051         ieee80211_send_assoc(sdata, ifsta);
1052
1053         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1054 }
1055
1056
1057 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1058                                  struct ieee80211_if_sta *ifsta)
1059 {
1060         struct ieee80211_local *local = sdata->local;
1061         struct sta_info *sta;
1062         int disassoc;
1063
1064         /* TODO: start monitoring current AP signal quality and number of
1065          * missed beacons. Scan other channels every now and then and search
1066          * for better APs. */
1067         /* TODO: remove expired BSSes */
1068
1069         ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1070
1071         rcu_read_lock();
1072
1073         sta = sta_info_get(local, ifsta->bssid);
1074         if (!sta) {
1075                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1076                        sdata->dev->name, ifsta->bssid);
1077                 disassoc = 1;
1078         } else {
1079                 disassoc = 0;
1080                 if (time_after(jiffies,
1081                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1082                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1083                                 printk(KERN_DEBUG "%s: No ProbeResp from "
1084                                        "current AP %pM - assume out of "
1085                                        "range\n",
1086                                        sdata->dev->name, ifsta->bssid);
1087                                 disassoc = 1;
1088                         } else
1089                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1090                                                          ifsta->ssid,
1091                                                          ifsta->ssid_len);
1092                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1093                 } else {
1094                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1095                         if (time_after(jiffies, ifsta->last_probe +
1096                                        IEEE80211_PROBE_INTERVAL)) {
1097                                 ifsta->last_probe = jiffies;
1098                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1099                                                          ifsta->ssid,
1100                                                          ifsta->ssid_len);
1101                         }
1102                 }
1103         }
1104
1105         rcu_read_unlock();
1106
1107         if (disassoc)
1108                 ieee80211_set_disassoc(sdata, ifsta, true, true,
1109                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1110         else
1111                 mod_timer(&ifsta->timer, jiffies +
1112                                       IEEE80211_MONITORING_INTERVAL);
1113 }
1114
1115
1116 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1117                                      struct ieee80211_if_sta *ifsta)
1118 {
1119         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1120         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1121         ieee80211_associate(sdata, ifsta);
1122 }
1123
1124
1125 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1126                                      struct ieee80211_if_sta *ifsta,
1127                                      struct ieee80211_mgmt *mgmt,
1128                                      size_t len)
1129 {
1130         u8 *pos;
1131         struct ieee802_11_elems elems;
1132
1133         pos = mgmt->u.auth.variable;
1134         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1135         if (!elems.challenge)
1136                 return;
1137         ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1138                             elems.challenge_len + 2, 1);
1139 }
1140
1141 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1142                                    struct ieee80211_if_sta *ifsta,
1143                                    struct ieee80211_mgmt *mgmt,
1144                                    size_t len)
1145 {
1146         u16 auth_alg, auth_transaction, status_code;
1147
1148         if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1149             sdata->vif.type != NL80211_IFTYPE_ADHOC)
1150                 return;
1151
1152         if (len < 24 + 6)
1153                 return;
1154
1155         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1156             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1157                 return;
1158
1159         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1160             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1161                 return;
1162
1163         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1164         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1165         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1166
1167         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1168                 /*
1169                  * IEEE 802.11 standard does not require authentication in IBSS
1170                  * networks and most implementations do not seem to use it.
1171                  * However, try to reply to authentication attempts if someone
1172                  * has actually implemented this.
1173                  */
1174                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1175                         return;
1176                 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1177         }
1178
1179         if (auth_alg != ifsta->auth_alg ||
1180             auth_transaction != ifsta->auth_transaction)
1181                 return;
1182
1183         if (status_code != WLAN_STATUS_SUCCESS) {
1184                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1185                         u8 algs[3];
1186                         const int num_algs = ARRAY_SIZE(algs);
1187                         int i, pos;
1188                         algs[0] = algs[1] = algs[2] = 0xff;
1189                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1190                                 algs[0] = WLAN_AUTH_OPEN;
1191                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1192                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1193                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1194                                 algs[2] = WLAN_AUTH_LEAP;
1195                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1196                                 pos = 0;
1197                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1198                                 pos = 1;
1199                         else
1200                                 pos = 2;
1201                         for (i = 0; i < num_algs; i++) {
1202                                 pos++;
1203                                 if (pos >= num_algs)
1204                                         pos = 0;
1205                                 if (algs[pos] == ifsta->auth_alg ||
1206                                     algs[pos] == 0xff)
1207                                         continue;
1208                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1209                                     !ieee80211_sta_wep_configured(sdata))
1210                                         continue;
1211                                 ifsta->auth_alg = algs[pos];
1212                                 break;
1213                         }
1214                 }
1215                 return;
1216         }
1217
1218         switch (ifsta->auth_alg) {
1219         case WLAN_AUTH_OPEN:
1220         case WLAN_AUTH_LEAP:
1221                 ieee80211_auth_completed(sdata, ifsta);
1222                 break;
1223         case WLAN_AUTH_SHARED_KEY:
1224                 if (ifsta->auth_transaction == 4)
1225                         ieee80211_auth_completed(sdata, ifsta);
1226                 else
1227                         ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1228                 break;
1229         }
1230 }
1231
1232
1233 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1234                                      struct ieee80211_if_sta *ifsta,
1235                                      struct ieee80211_mgmt *mgmt,
1236                                      size_t len)
1237 {
1238         u16 reason_code;
1239
1240         if (len < 24 + 2)
1241                 return;
1242
1243         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1244                 return;
1245
1246         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1247
1248         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1249                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1250                                 sdata->dev->name, reason_code);
1251
1252         if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1253             ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1254             ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1255                 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1256                 mod_timer(&ifsta->timer, jiffies +
1257                                       IEEE80211_RETRY_AUTH_INTERVAL);
1258         }
1259
1260         ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1261         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1262 }
1263
1264
1265 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1266                                        struct ieee80211_if_sta *ifsta,
1267                                        struct ieee80211_mgmt *mgmt,
1268                                        size_t len)
1269 {
1270         u16 reason_code;
1271
1272         if (len < 24 + 2)
1273                 return;
1274
1275         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1276                 return;
1277
1278         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1279
1280         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1281                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1282                                 sdata->dev->name, reason_code);
1283
1284         if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1285                 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1286                 mod_timer(&ifsta->timer, jiffies +
1287                                       IEEE80211_RETRY_AUTH_INTERVAL);
1288         }
1289
1290         ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1291 }
1292
1293
1294 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1295                                          struct ieee80211_if_sta *ifsta,
1296                                          struct ieee80211_mgmt *mgmt,
1297                                          size_t len,
1298                                          int reassoc)
1299 {
1300         struct ieee80211_local *local = sdata->local;
1301         struct ieee80211_supported_band *sband;
1302         struct sta_info *sta;
1303         u32 rates, basic_rates;
1304         u16 capab_info, status_code, aid;
1305         struct ieee802_11_elems elems;
1306         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1307         u8 *pos;
1308         u32 changed = 0;
1309         int i, j;
1310         bool have_higher_than_11mbit = false, newsta = false;
1311         u16 ap_ht_cap_flags;
1312
1313         /* AssocResp and ReassocResp have identical structure, so process both
1314          * of them in this function. */
1315
1316         if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1317                 return;
1318
1319         if (len < 24 + 6)
1320                 return;
1321
1322         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1323                 return;
1324
1325         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1326         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1327         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1328
1329         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1330                "status=%d aid=%d)\n",
1331                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1332                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1333
1334         pos = mgmt->u.assoc_resp.variable;
1335         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1336
1337         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1338             elems.timeout_int && elems.timeout_int_len == 5 &&
1339             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1340                 u32 tu, ms;
1341                 tu = get_unaligned_le32(elems.timeout_int + 1);
1342                 ms = tu * 1024 / 1000;
1343                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1344                        "comeback duration %u TU (%u ms)\n",
1345                        sdata->dev->name, tu, ms);
1346                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1347                         mod_timer(&ifsta->timer,
1348                                   jiffies + msecs_to_jiffies(ms));
1349                 return;
1350         }
1351
1352         if (status_code != WLAN_STATUS_SUCCESS) {
1353                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1354                        sdata->dev->name, status_code);
1355                 /* if this was a reassociation, ensure we try a "full"
1356                  * association next time. This works around some broken APs
1357                  * which do not correctly reject reassociation requests. */
1358                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1359                 return;
1360         }
1361
1362         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1363                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1364                        "set\n", sdata->dev->name, aid);
1365         aid &= ~(BIT(15) | BIT(14));
1366
1367         if (!elems.supp_rates) {
1368                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1369                        sdata->dev->name);
1370                 return;
1371         }
1372
1373         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1374         ifsta->aid = aid;
1375         ifsta->ap_capab = capab_info;
1376
1377         kfree(ifsta->assocresp_ies);
1378         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1379         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1380         if (ifsta->assocresp_ies)
1381                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1382
1383         rcu_read_lock();
1384
1385         /* Add STA entry for the AP */
1386         sta = sta_info_get(local, ifsta->bssid);
1387         if (!sta) {
1388                 struct ieee80211_bss *bss;
1389
1390                 newsta = true;
1391
1392                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1393                 if (!sta) {
1394                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1395                                " the AP\n", sdata->dev->name);
1396                         rcu_read_unlock();
1397                         return;
1398                 }
1399                 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1400                                            local->hw.conf.channel->center_freq,
1401                                            ifsta->ssid, ifsta->ssid_len);
1402                 if (bss) {
1403                         sta->last_signal = bss->signal;
1404                         sta->last_qual = bss->qual;
1405                         sta->last_noise = bss->noise;
1406                         ieee80211_rx_bss_put(local, bss);
1407                 }
1408
1409                 /* update new sta with its last rx activity */
1410                 sta->last_rx = jiffies;
1411         }
1412
1413         /*
1414          * FIXME: Do we really need to update the sta_info's information here?
1415          *        We already know about the AP (we found it in our list) so it
1416          *        should already be filled with the right info, no?
1417          *        As is stands, all this is racy because typically we assume
1418          *        the information that is filled in here (except flags) doesn't
1419          *        change while a STA structure is alive. As such, it should move
1420          *        to between the sta_info_alloc() and sta_info_insert() above.
1421          */
1422
1423         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1424                            WLAN_STA_AUTHORIZED);
1425
1426         rates = 0;
1427         basic_rates = 0;
1428         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1429
1430         for (i = 0; i < elems.supp_rates_len; i++) {
1431                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1432                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1433
1434                 if (rate > 110)
1435                         have_higher_than_11mbit = true;
1436
1437                 for (j = 0; j < sband->n_bitrates; j++) {
1438                         if (sband->bitrates[j].bitrate == rate) {
1439                                 rates |= BIT(j);
1440                                 if (is_basic)
1441                                         basic_rates |= BIT(j);
1442                                 break;
1443                         }
1444                 }
1445         }
1446
1447         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1448                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1449                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1450
1451                 if (rate > 110)
1452                         have_higher_than_11mbit = true;
1453
1454                 for (j = 0; j < sband->n_bitrates; j++) {
1455                         if (sband->bitrates[j].bitrate == rate) {
1456                                 rates |= BIT(j);
1457                                 if (is_basic)
1458                                         basic_rates |= BIT(j);
1459                                 break;
1460                         }
1461                 }
1462         }
1463
1464         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1465         sdata->vif.bss_conf.basic_rates = basic_rates;
1466
1467         /* cf. IEEE 802.11 9.2.12 */
1468         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1469             have_higher_than_11mbit)
1470                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1471         else
1472                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1473
1474         if (elems.ht_cap_elem)
1475                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1476                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1477
1478         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1479
1480         rate_control_rate_init(sta);
1481
1482         if (ifsta->flags & IEEE80211_STA_MFP_ENABLED)
1483                 set_sta_flags(sta, WLAN_STA_MFP);
1484
1485         if (elems.wmm_param)
1486                 set_sta_flags(sta, WLAN_STA_WME);
1487
1488         if (newsta) {
1489                 int err = sta_info_insert(sta);
1490                 if (err) {
1491                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1492                                " the AP (error %d)\n", sdata->dev->name, err);
1493                         rcu_read_unlock();
1494                         return;
1495                 }
1496         }
1497
1498         rcu_read_unlock();
1499
1500         if (elems.wmm_param)
1501                 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1502                                          elems.wmm_param_len);
1503
1504         if (elems.ht_info_elem && elems.wmm_param &&
1505             (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1506                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1507                                                ap_ht_cap_flags);
1508
1509         /* set AID and assoc capability,
1510          * ieee80211_set_associated() will tell the driver */
1511         bss_conf->aid = aid;
1512         bss_conf->assoc_capability = capab_info;
1513         ieee80211_set_associated(sdata, ifsta, changed);
1514
1515         ieee80211_associated(sdata, ifsta);
1516 }
1517
1518
1519 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1520                                    struct ieee80211_if_sta *ifsta,
1521                                    struct ieee80211_bss *bss)
1522 {
1523         struct ieee80211_local *local = sdata->local;
1524         int res = 0, rates, i, j;
1525         struct sk_buff *skb;
1526         struct ieee80211_mgmt *mgmt;
1527         u8 *pos;
1528         struct ieee80211_supported_band *sband;
1529         union iwreq_data wrqu;
1530
1531         if (local->ops->reset_tsf) {
1532                 /* Reset own TSF to allow time synchronization work. */
1533                 local->ops->reset_tsf(local_to_hw(local));
1534         }
1535
1536         if ((ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) &&
1537            memcmp(ifsta->bssid, bss->bssid, ETH_ALEN) == 0)
1538                 return res;
1539
1540         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400 +
1541                             sdata->u.sta.ie_proberesp_len);
1542         if (!skb) {
1543                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1544                        "response\n", sdata->dev->name);
1545                 return -ENOMEM;
1546         }
1547
1548         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1549
1550         if (!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) {
1551                 /* Remove possible STA entries from other IBSS networks. */
1552                 sta_info_flush_delayed(sdata);
1553         }
1554
1555         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1556         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1557         if (res)
1558                 return res;
1559
1560         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1561
1562         sdata->drop_unencrypted = bss->capability &
1563                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1564
1565         res = ieee80211_set_freq(sdata, bss->freq);
1566
1567         if (res)
1568                 return res;
1569
1570         /* Build IBSS probe response */
1571
1572         skb_reserve(skb, local->hw.extra_tx_headroom);
1573
1574         mgmt = (struct ieee80211_mgmt *)
1575                 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1576         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1577         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1578                                                 IEEE80211_STYPE_PROBE_RESP);
1579         memset(mgmt->da, 0xff, ETH_ALEN);
1580         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1581         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1582         mgmt->u.beacon.beacon_int =
1583                 cpu_to_le16(local->hw.conf.beacon_int);
1584         mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1585         mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1586
1587         pos = skb_put(skb, 2 + ifsta->ssid_len);
1588         *pos++ = WLAN_EID_SSID;
1589         *pos++ = ifsta->ssid_len;
1590         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1591
1592         rates = bss->supp_rates_len;
1593         if (rates > 8)
1594                 rates = 8;
1595         pos = skb_put(skb, 2 + rates);
1596         *pos++ = WLAN_EID_SUPP_RATES;
1597         *pos++ = rates;
1598         memcpy(pos, bss->supp_rates, rates);
1599
1600         if (bss->band == IEEE80211_BAND_2GHZ) {
1601                 pos = skb_put(skb, 2 + 1);
1602                 *pos++ = WLAN_EID_DS_PARAMS;
1603                 *pos++ = 1;
1604                 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1605         }
1606
1607         pos = skb_put(skb, 2 + 2);
1608         *pos++ = WLAN_EID_IBSS_PARAMS;
1609         *pos++ = 2;
1610         /* FIX: set ATIM window based on scan results */
1611         *pos++ = 0;
1612         *pos++ = 0;
1613
1614         if (bss->supp_rates_len > 8) {
1615                 rates = bss->supp_rates_len - 8;
1616                 pos = skb_put(skb, 2 + rates);
1617                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1618                 *pos++ = rates;
1619                 memcpy(pos, &bss->supp_rates[8], rates);
1620         }
1621
1622         add_extra_ies(skb, sdata->u.sta.ie_proberesp,
1623                       sdata->u.sta.ie_proberesp_len);
1624
1625         ifsta->probe_resp = skb;
1626
1627         ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON |
1628                                    IEEE80211_IFCC_BEACON_ENABLED);
1629
1630
1631         rates = 0;
1632         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1633         for (i = 0; i < bss->supp_rates_len; i++) {
1634                 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1635                 for (j = 0; j < sband->n_bitrates; j++)
1636                         if (sband->bitrates[j].bitrate == bitrate)
1637                                 rates |= BIT(j);
1638         }
1639         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1640
1641         ieee80211_sta_def_wmm_params(sdata, bss);
1642
1643         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
1644         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1645         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1646
1647         ieee80211_led_assoc(local, true);
1648
1649         memset(&wrqu, 0, sizeof(wrqu));
1650         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1651         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1652
1653         return res;
1654 }
1655
1656 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1657                                   struct ieee80211_mgmt *mgmt,
1658                                   size_t len,
1659                                   struct ieee80211_rx_status *rx_status,
1660                                   struct ieee802_11_elems *elems,
1661                                   bool beacon)
1662 {
1663         struct ieee80211_local *local = sdata->local;
1664         int freq;
1665         struct ieee80211_bss *bss;
1666         struct sta_info *sta;
1667         struct ieee80211_channel *channel;
1668         u64 beacon_timestamp, rx_timestamp;
1669         u32 supp_rates = 0;
1670         enum ieee80211_band band = rx_status->band;
1671
1672         if (elems->ds_params && elems->ds_params_len == 1)
1673                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1674         else
1675                 freq = rx_status->freq;
1676
1677         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1678
1679         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1680                 return;
1681
1682         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1683             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1684                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1685
1686                 rcu_read_lock();
1687
1688                 sta = sta_info_get(local, mgmt->sa);
1689                 if (sta) {
1690                         u32 prev_rates;
1691
1692                         prev_rates = sta->sta.supp_rates[band];
1693                         /* make sure mandatory rates are always added */
1694                         sta->sta.supp_rates[band] = supp_rates |
1695                                 ieee80211_mandatory_rates(local, band);
1696
1697 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1698                         if (sta->sta.supp_rates[band] != prev_rates)
1699                                 printk(KERN_DEBUG "%s: updated supp_rates set "
1700                                     "for %pM based on beacon info (0x%llx | "
1701                                     "0x%llx -> 0x%llx)\n",
1702                                     sdata->dev->name,
1703                                     sta->sta.addr,
1704                                     (unsigned long long) prev_rates,
1705                                     (unsigned long long) supp_rates,
1706                                     (unsigned long long) sta->sta.supp_rates[band]);
1707 #endif
1708                 } else {
1709                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1710                 }
1711
1712                 rcu_read_unlock();
1713         }
1714
1715         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1716                                         freq, beacon);
1717         if (!bss)
1718                 return;
1719
1720         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1721             (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
1722                 struct ieee80211_channel_sw_ie *sw_elem =
1723                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1724                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1725         }
1726
1727         /* was just updated in ieee80211_bss_info_update */
1728         beacon_timestamp = bss->timestamp;
1729
1730         /*
1731          * In STA mode, the remaining parameters should not be overridden
1732          * by beacons because they're not necessarily accurate there.
1733          */
1734         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1735             bss->last_probe_resp && beacon) {
1736                 ieee80211_rx_bss_put(local, bss);
1737                 return;
1738         }
1739
1740         /* check if we need to merge IBSS */
1741         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1742             (!(sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)) &&
1743             bss->capability & WLAN_CAPABILITY_IBSS &&
1744             bss->freq == local->oper_channel->center_freq &&
1745             elems->ssid_len == sdata->u.sta.ssid_len &&
1746             memcmp(elems->ssid, sdata->u.sta.ssid,
1747                                 sdata->u.sta.ssid_len) == 0) {
1748                 if (rx_status->flag & RX_FLAG_TSFT) {
1749                         /* in order for correct IBSS merging we need mactime
1750                          *
1751                          * since mactime is defined as the time the first data
1752                          * symbol of the frame hits the PHY, and the timestamp
1753                          * of the beacon is defined as "the time that the data
1754                          * symbol containing the first bit of the timestamp is
1755                          * transmitted to the PHY plus the transmitting STA’s
1756                          * delays through its local PHY from the MAC-PHY
1757                          * interface to its interface with the WM"
1758                          * (802.11 11.1.2) - equals the time this bit arrives at
1759                          * the receiver - we have to take into account the
1760                          * offset between the two.
1761                          * e.g: at 1 MBit that means mactime is 192 usec earlier
1762                          * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1763                          */
1764                         int rate;
1765                         if (rx_status->flag & RX_FLAG_HT) {
1766                                 rate = 65; /* TODO: HT rates */
1767                         } else {
1768                                 rate = local->hw.wiphy->bands[band]->
1769                                         bitrates[rx_status->rate_idx].bitrate;
1770                         }
1771                         rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1772                 } else if (local && local->ops && local->ops->get_tsf)
1773                         /* second best option: get current TSF */
1774                         rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1775                 else
1776                         /* can't merge without knowing the TSF */
1777                         rx_timestamp = -1LLU;
1778 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1779                 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1780                        "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1781                        mgmt->sa, mgmt->bssid,
1782                        (unsigned long long)rx_timestamp,
1783                        (unsigned long long)beacon_timestamp,
1784                        (unsigned long long)(rx_timestamp - beacon_timestamp),
1785                        jiffies);
1786 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1787                 if (beacon_timestamp > rx_timestamp) {
1788 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1789                         printk(KERN_DEBUG "%s: beacon TSF higher than "
1790                                "local TSF - IBSS merge with BSSID %pM\n",
1791                                sdata->dev->name, mgmt->bssid);
1792 #endif
1793                         ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1794                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1795                 }
1796         }
1797
1798         ieee80211_rx_bss_put(local, bss);
1799 }
1800
1801
1802 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1803                                          struct ieee80211_mgmt *mgmt,
1804                                          size_t len,
1805                                          struct ieee80211_rx_status *rx_status)
1806 {
1807         size_t baselen;
1808         struct ieee802_11_elems elems;
1809         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1810
1811         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1812                 return; /* ignore ProbeResp to foreign address */
1813
1814         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1815         if (baselen > len)
1816                 return;
1817
1818         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1819                                 &elems);
1820
1821         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1822
1823         /* direct probe may be part of the association flow */
1824         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1825                                                         &ifsta->request)) {
1826                 printk(KERN_DEBUG "%s direct probe responded\n",
1827                        sdata->dev->name);
1828                 ieee80211_authenticate(sdata, ifsta);
1829         }
1830 }
1831
1832
1833 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1834                                      struct ieee80211_mgmt *mgmt,
1835                                      size_t len,
1836                                      struct ieee80211_rx_status *rx_status)
1837 {
1838         struct ieee80211_if_sta *ifsta;
1839         size_t baselen;
1840         struct ieee802_11_elems elems;
1841         struct ieee80211_local *local = sdata->local;
1842         u32 changed = 0;
1843         bool erp_valid, directed_tim, is_mc = false;
1844         u8 erp_value = 0;
1845
1846         /* Process beacon from the current BSS */
1847         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1848         if (baselen > len)
1849                 return;
1850
1851         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1852
1853         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1854
1855         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1856                 return;
1857         ifsta = &sdata->u.sta;
1858
1859         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1860             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1861                 return;
1862
1863         if (rx_status->freq != local->hw.conf.channel->center_freq)
1864                 return;
1865
1866         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1867                                  elems.wmm_param_len);
1868
1869         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK &&
1870             local->hw.conf.flags & IEEE80211_CONF_PS) {
1871                 directed_tim = check_tim(&elems, ifsta->aid, &is_mc);
1872
1873                 if (directed_tim || is_mc) {
1874                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1875                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1876                         ieee80211_send_nullfunc(local, sdata, 0);
1877                 }
1878         }
1879
1880         if (elems.erp_info && elems.erp_info_len >= 1) {
1881                 erp_valid = true;
1882                 erp_value = elems.erp_info[0];
1883         } else {
1884                 erp_valid = false;
1885         }
1886         changed |= ieee80211_handle_bss_capability(sdata,
1887                         le16_to_cpu(mgmt->u.beacon.capab_info),
1888                         erp_valid, erp_value);
1889
1890
1891         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1892                 struct sta_info *sta;
1893                 struct ieee80211_supported_band *sband;
1894                 u16 ap_ht_cap_flags;
1895
1896                 rcu_read_lock();
1897
1898                 sta = sta_info_get(local, ifsta->bssid);
1899                 if (!sta) {
1900                         rcu_read_unlock();
1901                         return;
1902                 }
1903
1904                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1905
1906                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1907                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1908
1909                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1910
1911                 rcu_read_unlock();
1912
1913                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1914                                                ap_ht_cap_flags);
1915         }
1916
1917         if (elems.country_elem) {
1918                 /* Note we are only reviewing this on beacons
1919                  * for the BSSID we are associated to */
1920                 regulatory_hint_11d(local->hw.wiphy,
1921                         elems.country_elem, elems.country_elem_len);
1922
1923                 /* TODO: IBSS also needs this */
1924                 if (elems.pwr_constr_elem)
1925                         ieee80211_handle_pwr_constr(sdata,
1926                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1927                                 elems.pwr_constr_elem,
1928                                 elems.pwr_constr_elem_len);
1929         }
1930
1931         ieee80211_bss_info_change_notify(sdata, changed);
1932 }
1933
1934
1935 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1936                                         struct ieee80211_if_sta *ifsta,
1937                                         struct ieee80211_mgmt *mgmt,
1938                                         size_t len)
1939 {
1940         struct ieee80211_local *local = sdata->local;
1941         int tx_last_beacon;
1942         struct sk_buff *skb;
1943         struct ieee80211_mgmt *resp;
1944         u8 *pos, *end;
1945
1946         if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1947             ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1948             len < 24 + 2 || !ifsta->probe_resp)
1949                 return;
1950
1951         if (local->ops->tx_last_beacon)
1952                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1953         else
1954                 tx_last_beacon = 1;
1955
1956 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1957         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1958                " (tx_last_beacon=%d)\n",
1959                sdata->dev->name, mgmt->sa, mgmt->da,
1960                mgmt->bssid, tx_last_beacon);
1961 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1962
1963         if (!tx_last_beacon)
1964                 return;
1965
1966         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1967             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1968                 return;
1969
1970         end = ((u8 *) mgmt) + len;
1971         pos = mgmt->u.probe_req.variable;
1972         if (pos[0] != WLAN_EID_SSID ||
1973             pos + 2 + pos[1] > end) {
1974 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1975                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1976                        "from %pM\n",
1977                        sdata->dev->name, mgmt->sa);
1978 #endif
1979                 return;
1980         }
1981         if (pos[1] != 0 &&
1982             (pos[1] != ifsta->ssid_len ||
1983              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1984                 /* Ignore ProbeReq for foreign SSID */
1985                 return;
1986         }
1987
1988         /* Reply with ProbeResp */
1989         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1990         if (!skb)
1991                 return;
1992
1993         resp = (struct ieee80211_mgmt *) skb->data;
1994         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1995 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1996         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1997                sdata->dev->name, resp->da);
1998 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1999         ieee80211_tx_skb(sdata, skb, 0);
2000 }
2001
2002 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
2003                            struct ieee80211_rx_status *rx_status)
2004 {
2005         struct ieee80211_local *local = sdata->local;
2006         struct ieee80211_if_sta *ifsta;
2007         struct ieee80211_mgmt *mgmt;
2008         u16 fc;
2009
2010         if (skb->len < 24)
2011                 goto fail;
2012
2013         ifsta = &sdata->u.sta;
2014
2015         mgmt = (struct ieee80211_mgmt *) skb->data;
2016         fc = le16_to_cpu(mgmt->frame_control);
2017
2018         switch (fc & IEEE80211_FCTL_STYPE) {
2019         case IEEE80211_STYPE_PROBE_REQ:
2020         case IEEE80211_STYPE_PROBE_RESP:
2021         case IEEE80211_STYPE_BEACON:
2022                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
2023         case IEEE80211_STYPE_AUTH:
2024         case IEEE80211_STYPE_ASSOC_RESP:
2025         case IEEE80211_STYPE_REASSOC_RESP:
2026         case IEEE80211_STYPE_DEAUTH:
2027         case IEEE80211_STYPE_DISASSOC:
2028                 skb_queue_tail(&ifsta->skb_queue, skb);
2029                 queue_work(local->hw.workqueue, &ifsta->work);
2030                 return;
2031         }
2032
2033  fail:
2034         kfree_skb(skb);
2035 }
2036
2037 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2038                                          struct sk_buff *skb)
2039 {
2040         struct ieee80211_rx_status *rx_status;
2041         struct ieee80211_if_sta *ifsta;
2042         struct ieee80211_mgmt *mgmt;
2043         u16 fc;
2044
2045         ifsta = &sdata->u.sta;
2046
2047         rx_status = (struct ieee80211_rx_status *) skb->cb;
2048         mgmt = (struct ieee80211_mgmt *) skb->data;
2049         fc = le16_to_cpu(mgmt->frame_control);
2050
2051         switch (fc & IEEE80211_FCTL_STYPE) {
2052         case IEEE80211_STYPE_PROBE_REQ:
2053                 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len);
2054                 break;
2055         case IEEE80211_STYPE_PROBE_RESP:
2056                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
2057                 break;
2058         case IEEE80211_STYPE_BEACON:
2059                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2060                 break;
2061         case IEEE80211_STYPE_AUTH:
2062                 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
2063                 break;
2064         case IEEE80211_STYPE_ASSOC_RESP:
2065                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
2066                 break;
2067         case IEEE80211_STYPE_REASSOC_RESP:
2068                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
2069                 break;
2070         case IEEE80211_STYPE_DEAUTH:
2071                 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
2072                 break;
2073         case IEEE80211_STYPE_DISASSOC:
2074                 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
2075                 break;
2076         }
2077
2078         kfree_skb(skb);
2079 }
2080
2081
2082 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
2083 {
2084         struct ieee80211_local *local = sdata->local;
2085         int active = 0;
2086         struct sta_info *sta;
2087
2088         rcu_read_lock();
2089
2090         list_for_each_entry_rcu(sta, &local->sta_list, list) {
2091                 if (sta->sdata == sdata &&
2092                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
2093                                jiffies)) {
2094                         active++;
2095                         break;
2096                 }
2097         }
2098
2099         rcu_read_unlock();
2100
2101         return active;
2102 }
2103
2104
2105 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
2106                                      struct ieee80211_if_sta *ifsta)
2107 {
2108         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2109
2110         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
2111         if (ieee80211_sta_active_ibss(sdata))
2112                 return;
2113
2114         if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
2115             (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
2116                 return;
2117
2118         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2119                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
2120         ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
2121 }
2122
2123
2124 static void ieee80211_sta_timer(unsigned long data)
2125 {
2126         struct ieee80211_sub_if_data *sdata =
2127                 (struct ieee80211_sub_if_data *) data;
2128         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2129         struct ieee80211_local *local = sdata->local;
2130
2131         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2132         queue_work(local->hw.workqueue, &ifsta->work);
2133 }
2134
2135 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
2136                                      struct ieee80211_if_sta *ifsta)
2137 {
2138         struct ieee80211_local *local = sdata->local;
2139
2140         if (local->ops->reset_tsf) {
2141                 /* Reset own TSF to allow time synchronization work. */
2142                 local->ops->reset_tsf(local_to_hw(local));
2143         }
2144
2145         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2146
2147
2148         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2149                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2150         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2151                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2152         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2153                 ifsta->auth_alg = WLAN_AUTH_LEAP;
2154         else
2155                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2156         ifsta->auth_transaction = -1;
2157         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2158         ifsta->assoc_scan_tries = 0;
2159         ifsta->direct_probe_tries = 0;
2160         ifsta->auth_tries = 0;
2161         ifsta->assoc_tries = 0;
2162         netif_tx_stop_all_queues(sdata->dev);
2163         netif_carrier_off(sdata->dev);
2164 }
2165
2166
2167 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2168                                     const char *ssid, int ssid_len)
2169 {
2170         int tmp, hidden_ssid;
2171
2172         if (ssid_len == ifsta->ssid_len &&
2173             !memcmp(ifsta->ssid, ssid, ssid_len))
2174                 return 1;
2175
2176         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2177                 return 0;
2178
2179         hidden_ssid = 1;
2180         tmp = ssid_len;
2181         while (tmp--) {
2182                 if (ssid[tmp] != '\0') {
2183                         hidden_ssid = 0;
2184                         break;
2185                 }
2186         }
2187
2188         if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
2189                 return 1;
2190
2191         if (ssid_len == 1 && ssid[0] == ' ')
2192                 return 1;
2193
2194         return 0;
2195 }
2196
2197 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2198                                      struct ieee80211_if_sta *ifsta)
2199 {
2200         struct ieee80211_local *local = sdata->local;
2201         struct ieee80211_bss *bss;
2202         struct ieee80211_supported_band *sband;
2203         u8 bssid[ETH_ALEN], *pos;
2204         int i;
2205         int ret;
2206
2207         if (sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) {
2208                 memcpy(bssid, ifsta->bssid, ETH_ALEN);
2209         } else {
2210                 /* Generate random, not broadcast, locally administered BSSID. Mix in
2211                  * own MAC address to make sure that devices that do not have proper
2212                  * random number generator get different BSSID. */
2213                 get_random_bytes(bssid, ETH_ALEN);
2214                 for (i = 0; i < ETH_ALEN; i++)
2215                         bssid[i] ^= sdata->dev->dev_addr[i];
2216                 bssid[0] &= ~0x01;
2217                 bssid[0] |= 0x02;
2218         }
2219
2220         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2221                sdata->dev->name, bssid);
2222
2223         bss = ieee80211_rx_bss_add(local, bssid,
2224                                    local->hw.conf.channel->center_freq,
2225                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2226         if (!bss)
2227                 return -ENOMEM;
2228
2229         bss->band = local->hw.conf.channel->band;
2230         sband = local->hw.wiphy->bands[bss->band];
2231
2232         if (local->hw.conf.beacon_int == 0)
2233                 local->hw.conf.beacon_int = 100;
2234         bss->beacon_int = local->hw.conf.beacon_int;
2235         bss->last_update = jiffies;
2236         bss->capability = WLAN_CAPABILITY_IBSS;
2237
2238         if (sdata->default_key)
2239                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2240         else
2241                 sdata->drop_unencrypted = 0;
2242
2243         bss->supp_rates_len = sband->n_bitrates;
2244         pos = bss->supp_rates;
2245         for (i = 0; i < sband->n_bitrates; i++) {
2246                 int rate = sband->bitrates[i].bitrate;
2247                 *pos++ = (u8) (rate / 5);
2248         }
2249
2250         ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2251         ieee80211_rx_bss_put(local, bss);
2252         return ret;
2253 }
2254
2255
2256 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2257                                    struct ieee80211_if_sta *ifsta)
2258 {
2259         struct ieee80211_local *local = sdata->local;
2260         struct ieee80211_bss *bss;
2261         int found = 0;
2262         u8 bssid[ETH_ALEN];
2263         int active_ibss;
2264
2265         if (ifsta->ssid_len == 0)
2266                 return -EINVAL;
2267
2268         active_ibss = ieee80211_sta_active_ibss(sdata);
2269 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2270         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2271                sdata->dev->name, active_ibss);
2272 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2273         spin_lock_bh(&local->bss_lock);
2274         list_for_each_entry(bss, &local->bss_list, list) {
2275                 if (ifsta->ssid_len != bss->ssid_len ||
2276                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2277                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2278                         continue;
2279                 if ((ifsta->flags & IEEE80211_STA_BSSID_SET) &&
2280                     memcmp(ifsta->bssid, bss->bssid, ETH_ALEN) != 0)
2281                         continue;
2282 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2283                 printk(KERN_DEBUG "   bssid=%pM found\n", bss->bssid);
2284 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2285                 memcpy(bssid, bss->bssid, ETH_ALEN);
2286                 found = 1;
2287                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2288                         break;
2289         }
2290         spin_unlock_bh(&local->bss_lock);
2291
2292 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2293         if (found)
2294                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
2295                        "%pM\n", bssid, ifsta->bssid);
2296 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2297
2298         if (found &&
2299             ((!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) ||
2300              memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0)) {
2301                 int ret;
2302                 int search_freq;
2303
2304                 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2305                         search_freq = bss->freq;
2306                 else
2307                         search_freq = local->hw.conf.channel->center_freq;
2308
2309                 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2310                                            ifsta->ssid, ifsta->ssid_len);
2311                 if (!bss)
2312                         goto dont_join;
2313
2314                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2315                        " based on configured SSID\n",
2316                        sdata->dev->name, bssid);
2317                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2318                 ieee80211_rx_bss_put(local, bss);
2319                 return ret;
2320         }
2321
2322 dont_join:
2323 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2324         printk(KERN_DEBUG "   did not try to join ibss\n");
2325 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2326
2327         /* Selected IBSS not found in current scan results - try to scan */
2328         if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2329             !ieee80211_sta_active_ibss(sdata)) {
2330                 mod_timer(&ifsta->timer, jiffies +
2331                                       IEEE80211_IBSS_MERGE_INTERVAL);
2332         } else if (time_after(jiffies, local->last_scan_completed +
2333                               IEEE80211_SCAN_INTERVAL)) {
2334                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2335                        "join\n", sdata->dev->name);
2336                 return ieee80211_request_scan(sdata, ifsta->ssid,
2337                                               ifsta->ssid_len);
2338         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2339                 int interval = IEEE80211_SCAN_INTERVAL;
2340
2341                 if (time_after(jiffies, ifsta->ibss_join_req +
2342                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2343                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2344                             (!(local->oper_channel->flags &
2345                                         IEEE80211_CHAN_NO_IBSS)))
2346                                 return ieee80211_sta_create_ibss(sdata, ifsta);
2347                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2348                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
2349                                        " %d MHz\n", sdata->dev->name,
2350                                        local->hw.conf.channel->center_freq);
2351                         }
2352
2353                         /* No IBSS found - decrease scan interval and continue
2354                          * scanning. */
2355                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2356                 }
2357
2358                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2359                 mod_timer(&ifsta->timer, jiffies + interval);
2360                 return 0;
2361         }
2362
2363         return 0;
2364 }
2365
2366
2367 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2368                                      struct ieee80211_if_sta *ifsta)
2369 {
2370         struct ieee80211_local *local = sdata->local;
2371         struct ieee80211_bss *bss, *selected = NULL;
2372         int top_rssi = 0, freq;
2373
2374         spin_lock_bh(&local->bss_lock);
2375         freq = local->oper_channel->center_freq;
2376         list_for_each_entry(bss, &local->bss_list, list) {
2377                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2378                         continue;
2379
2380                 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2381                         IEEE80211_STA_AUTO_BSSID_SEL |
2382                         IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2383                     (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2384                      !!sdata->default_key))
2385                         continue;
2386
2387                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2388                     bss->freq != freq)
2389                         continue;
2390
2391                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2392                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2393                         continue;
2394
2395                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2396                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2397                         continue;
2398
2399                 if (!selected || top_rssi < bss->signal) {
2400                         selected = bss;
2401                         top_rssi = bss->signal;
2402                 }
2403         }
2404         if (selected)
2405                 atomic_inc(&selected->users);
2406         spin_unlock_bh(&local->bss_lock);
2407
2408         if (selected) {
2409                 ieee80211_set_freq(sdata, selected->freq);
2410                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2411                         ieee80211_sta_set_ssid(sdata, selected->ssid,
2412                                                selected->ssid_len);
2413                 ieee80211_sta_set_bssid(sdata, selected->bssid);
2414                 ieee80211_sta_def_wmm_params(sdata, selected);
2415                 if (sdata->u.sta.mfp == IEEE80211_MFP_REQUIRED)
2416                         sdata->u.sta.flags |= IEEE80211_STA_MFP_ENABLED;
2417                 else
2418                         sdata->u.sta.flags &= ~IEEE80211_STA_MFP_ENABLED;
2419
2420                 /* Send out direct probe if no probe resp was received or
2421                  * the one we have is outdated
2422                  */
2423                 if (!selected->last_probe_resp ||
2424                     time_after(jiffies, selected->last_probe_resp
2425                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2426                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2427                 else
2428                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2429
2430                 ieee80211_rx_bss_put(local, selected);
2431                 ieee80211_sta_reset_auth(sdata, ifsta);
2432                 return 0;
2433         } else {
2434                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2435                         ifsta->assoc_scan_tries++;
2436                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2437                                 ieee80211_start_scan(sdata, NULL, 0);
2438                         else
2439                                 ieee80211_start_scan(sdata, ifsta->ssid,
2440                                                          ifsta->ssid_len);
2441                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2442                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2443                 } else {
2444                         ifsta->assoc_scan_tries = 0;
2445                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
2446                 }
2447         }
2448         return -1;
2449 }
2450
2451
2452 static void ieee80211_sta_work(struct work_struct *work)
2453 {
2454         struct ieee80211_sub_if_data *sdata =
2455                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2456         struct ieee80211_local *local = sdata->local;
2457         struct ieee80211_if_sta *ifsta;
2458         struct sk_buff *skb;
2459
2460         if (!netif_running(sdata->dev))
2461                 return;
2462
2463         if (local->sw_scanning || local->hw_scanning)
2464                 return;
2465
2466         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2467                     sdata->vif.type != NL80211_IFTYPE_ADHOC))
2468                 return;
2469         ifsta = &sdata->u.sta;
2470
2471         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2472                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2473
2474         if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2475             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2476             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2477             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2478                 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2479                                      ifsta->scan_ssid_len);
2480                 return;
2481         }
2482
2483         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2484                 if (ieee80211_sta_config_auth(sdata, ifsta))
2485                         return;
2486                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2487         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2488                 return;
2489
2490         switch (ifsta->state) {
2491         case IEEE80211_STA_MLME_DISABLED:
2492                 break;
2493         case IEEE80211_STA_MLME_DIRECT_PROBE:
2494                 ieee80211_direct_probe(sdata, ifsta);
2495                 break;
2496         case IEEE80211_STA_MLME_AUTHENTICATE:
2497                 ieee80211_authenticate(sdata, ifsta);
2498                 break;
2499         case IEEE80211_STA_MLME_ASSOCIATE:
2500                 ieee80211_associate(sdata, ifsta);
2501                 break;
2502         case IEEE80211_STA_MLME_ASSOCIATED:
2503                 ieee80211_associated(sdata, ifsta);
2504                 break;
2505         case IEEE80211_STA_MLME_IBSS_SEARCH:
2506                 ieee80211_sta_find_ibss(sdata, ifsta);
2507                 break;
2508         case IEEE80211_STA_MLME_IBSS_JOINED:
2509                 ieee80211_sta_merge_ibss(sdata, ifsta);
2510                 break;
2511         default:
2512                 WARN_ON(1);
2513                 break;
2514         }
2515
2516         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2517                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2518                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2519
2520                 ieee80211_set_disassoc(sdata, ifsta, false, true,
2521                                         WLAN_REASON_UNSPECIFIED);
2522         }
2523 }
2524
2525 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2526 {
2527         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2528                 queue_work(sdata->local->hw.workqueue,
2529                            &sdata->u.sta.work);
2530 }
2531
2532 /* interface setup */
2533 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2534 {
2535         struct ieee80211_if_sta *ifsta;
2536
2537         ifsta = &sdata->u.sta;
2538         INIT_WORK(&ifsta->work, ieee80211_sta_work);
2539         INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
2540         setup_timer(&ifsta->timer, ieee80211_sta_timer,
2541                     (unsigned long) sdata);
2542         setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
2543                     (unsigned long) sdata);
2544         skb_queue_head_init(&ifsta->skb_queue);
2545
2546         ifsta->capab = WLAN_CAPABILITY_ESS;
2547         ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2548                 IEEE80211_AUTH_ALG_SHARED_KEY;
2549         ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2550                 IEEE80211_STA_AUTO_BSSID_SEL |
2551                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2552         if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2553                 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2554 }
2555
2556 /*
2557  * Add a new IBSS station, will also be called by the RX code when,
2558  * in IBSS mode, receiving a frame from a yet-unknown station, hence
2559  * must be callable in atomic context.
2560  */
2561 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2562                                         u8 *bssid,u8 *addr, u32 supp_rates)
2563 {
2564         struct ieee80211_local *local = sdata->local;
2565         struct sta_info *sta;
2566         int band = local->hw.conf.channel->band;
2567
2568         /* TODO: Could consider removing the least recently used entry and
2569          * allow new one to be added. */
2570         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2571                 if (net_ratelimit()) {
2572                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2573                                "entry %pM\n", sdata->dev->name, addr);
2574                 }
2575                 return NULL;
2576         }
2577
2578         if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2579                 return NULL;
2580
2581 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2582         printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2583                wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2584 #endif
2585
2586         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2587         if (!sta)
2588                 return NULL;
2589
2590         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2591
2592         /* make sure mandatory rates are always added */
2593         sta->sta.supp_rates[band] = supp_rates |
2594                         ieee80211_mandatory_rates(local, band);
2595
2596         rate_control_rate_init(sta);
2597
2598         if (sta_info_insert(sta))
2599                 return NULL;
2600
2601         return sta;
2602 }
2603
2604 /* configuration hooks */
2605 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2606                             struct ieee80211_if_sta *ifsta)
2607 {
2608         struct ieee80211_local *local = sdata->local;
2609
2610         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2611                 return;
2612
2613         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2614                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2615             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2616                              IEEE80211_STA_AUTO_SSID_SEL))) {
2617
2618                 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2619                         ieee80211_set_disassoc(sdata, ifsta, true, true,
2620                                                WLAN_REASON_DEAUTH_LEAVING);
2621
2622                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2623                 queue_work(local->hw.workqueue, &ifsta->work);
2624         }
2625 }
2626
2627 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2628 {
2629         struct ieee80211_if_sta *ifsta;
2630
2631         if (len > IEEE80211_MAX_SSID_LEN)
2632                 return -EINVAL;
2633
2634         ifsta = &sdata->u.sta;
2635
2636         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2637                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2638                 memcpy(ifsta->ssid, ssid, len);
2639                 ifsta->ssid_len = len;
2640         }
2641
2642         ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2643
2644         if (len)
2645                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2646         else
2647                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2648
2649         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2650                 ifsta->ibss_join_req = jiffies;
2651                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2652                 return ieee80211_sta_find_ibss(sdata, ifsta);
2653         }
2654
2655         return 0;
2656 }
2657
2658 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2659 {
2660         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2661         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2662         *len = ifsta->ssid_len;
2663         return 0;
2664 }
2665
2666 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2667 {
2668         struct ieee80211_if_sta *ifsta;
2669
2670         ifsta = &sdata->u.sta;
2671
2672         if (is_valid_ether_addr(bssid)) {
2673                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2674                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2675         } else {
2676                 memset(ifsta->bssid, 0, ETH_ALEN);
2677                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2678         }
2679
2680         if (netif_running(sdata->dev)) {
2681                 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
2682                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2683                                "the low-level driver\n", sdata->dev->name);
2684                 }
2685         }
2686
2687         return ieee80211_sta_set_ssid(sdata, ifsta->ssid, ifsta->ssid_len);
2688 }
2689
2690 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2691 {
2692         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2693
2694         kfree(ifsta->extra_ie);
2695         if (len == 0) {
2696                 ifsta->extra_ie = NULL;
2697                 ifsta->extra_ie_len = 0;
2698                 return 0;
2699         }
2700         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2701         if (!ifsta->extra_ie) {
2702                 ifsta->extra_ie_len = 0;
2703                 return -ENOMEM;
2704         }
2705         memcpy(ifsta->extra_ie, ie, len);
2706         ifsta->extra_ie_len = len;
2707         return 0;
2708 }
2709
2710 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2711 {
2712         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2713
2714         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2715                sdata->dev->name, reason);
2716
2717         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2718             sdata->vif.type != NL80211_IFTYPE_ADHOC)
2719                 return -EINVAL;
2720
2721         ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2722         return 0;
2723 }
2724
2725 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2726 {
2727         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2728
2729         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2730                sdata->dev->name, reason);
2731
2732         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2733                 return -EINVAL;
2734
2735         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2736                 return -1;
2737
2738         ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2739         return 0;
2740 }
2741
2742 /* scan finished notification */
2743 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2744 {
2745         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2746         struct ieee80211_if_sta *ifsta;
2747
2748         if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2749                 ifsta = &sdata->u.sta;
2750                 if ((!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) ||
2751                     !ieee80211_sta_active_ibss(sdata))
2752                         ieee80211_sta_find_ibss(sdata, ifsta);
2753         }
2754
2755         /* Restart STA timers */
2756         rcu_read_lock();
2757         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2758                 ieee80211_restart_sta_timer(sdata);
2759         rcu_read_unlock();
2760 }
2761
2762 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2763 {
2764         struct ieee80211_local *local =
2765                 container_of(work, struct ieee80211_local,
2766                              dynamic_ps_disable_work);
2767
2768         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2769                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2770                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2771         }
2772
2773         ieee80211_wake_queues_by_reason(&local->hw,
2774                                         IEEE80211_QUEUE_STOP_REASON_PS);
2775 }
2776
2777 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2778 {
2779         struct ieee80211_local *local =
2780                 container_of(work, struct ieee80211_local,
2781                              dynamic_ps_enable_work);
2782         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2783
2784         if (local->hw.conf.flags & IEEE80211_CONF_PS)
2785                 return;
2786
2787         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2788                 ieee80211_send_nullfunc(local, sdata, 1);
2789
2790         local->hw.conf.flags |= IEEE80211_CONF_PS;
2791         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2792 }
2793
2794 void ieee80211_dynamic_ps_timer(unsigned long data)
2795 {
2796         struct ieee80211_local *local = (void *) data;
2797
2798         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2799 }