net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.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/netdevice.h>
  18 #include <linux/if_arp.h>
  19 #include <linux/wireless.h>
  20 #include <linux/random.h>
  21 #include <linux/etherdevice.h>
  22 #include <linux/rtnetlink.h>
  23 #include <net/iw_handler.h>
  24 #include <net/mac80211.h>
  25 #include <asm/unaligned.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "rate.h"
  29 #include "led.h"
  30
  31 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
  32 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  33 #define IEEE80211_AUTH_MAX_TRIES 3
  34 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  35 #define IEEE80211_ASSOC_MAX_TRIES 3
  36 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  37 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
  38 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  39 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  40 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
  41 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  42
  43 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  44 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  45
  46 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  47
  48
  49 /* utils */
  50 static int ecw2cw(int ecw)
  51 {
  52         return (1 << ecw) - 1;
  53 }
  54
  55 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  56 {
  57         u8 *end, *pos;
  58
  59         pos = bss->ies;
  60         if (pos == NULL)
  61                 return NULL;
  62         end = pos + bss->ies_len;
  63
  64         while (pos + 1 < end) {
  65                 if (pos + 2 + pos[1] > end)
  66                         break;
  67                 if (pos[0] == ie)
  68                         return pos;
  69                 pos += 2 + pos[1];
  70         }
  71
  72         return NULL;
  73 }
  74
  75 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  76                                       struct ieee80211_supported_band *sband,
  77                                       u64 *rates)
  78 {
  79         int i, j, count;
  80         *rates = 0;
  81         count = 0;
  82         for (i = 0; i < bss->supp_rates_len; i++) {
  83                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  84
  85                 for (j = 0; j < sband->n_bitrates; j++)
  86                         if (sband->bitrates[j].bitrate == rate) {
  87                                 *rates |= BIT(j);
  88                                 count++;
  89                                 break;
  90                         }
  91         }
  92
  93         return count;
  94 }
  95
  96 /* also used by mesh code */
  97 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
  98                             struct ieee802_11_elems *elems,
  99                             enum ieee80211_band band)
 100 {
 101         struct ieee80211_supported_band *sband;
 102         struct ieee80211_rate *bitrates;
 103         size_t num_rates;
 104         u64 supp_rates;
 105         int i, j;
 106         sband = local->hw.wiphy->bands[band];
 107
 108         if (!sband) {
 109                 WARN_ON(1);
 110                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 111         }
 112
 113         bitrates = sband->bitrates;
 114         num_rates = sband->n_bitrates;
 115         supp_rates = 0;
 116         for (i = 0; i < elems->supp_rates_len +
 117                      elems->ext_supp_rates_len; i++) {
 118                 u8 rate = 0;
 119                 int own_rate;
 120                 if (i < elems->supp_rates_len)
 121                         rate = elems->supp_rates[i];
 122                 else if (elems->ext_supp_rates)
 123                         rate = elems->ext_supp_rates
 124                                 [i - elems->supp_rates_len];
 125                 own_rate = 5 * (rate & 0x7f);
 126                 for (j = 0; j < num_rates; j++)
 127                         if (bitrates[j].bitrate == own_rate)
 128                                 supp_rates |= BIT(j);
 129         }
 130         return supp_rates;
 131 }
 132
 133 /* frame sending functions */
 134
 135 /* also used by scanning code */
 136 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 137                               u8 *ssid, size_t ssid_len)
 138 {
 139         struct ieee80211_local *local = sdata->local;
 140         struct ieee80211_supported_band *sband;
 141         struct sk_buff *skb;
 142         struct ieee80211_mgmt *mgmt;
 143         u8 *pos, *supp_rates, *esupp_rates = NULL;
 144         int i;
 145
 146         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
 147         if (!skb) {
 148                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 149                        "request\n", sdata->dev->name);
 150                 return;
 151         }
 152         skb_reserve(skb, local->hw.extra_tx_headroom);
 153
 154         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 155         memset(mgmt, 0, 24);
 156         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 157                                           IEEE80211_STYPE_PROBE_REQ);
 158         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 159         if (dst) {
 160                 memcpy(mgmt->da, dst, ETH_ALEN);
 161                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 162         } else {
 163                 memset(mgmt->da, 0xff, ETH_ALEN);
 164                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 165         }
 166         pos = skb_put(skb, 2 + ssid_len);
 167         *pos++ = WLAN_EID_SSID;
 168         *pos++ = ssid_len;
 169         memcpy(pos, ssid, ssid_len);
 170
 171         supp_rates = skb_put(skb, 2);
 172         supp_rates[0] = WLAN_EID_SUPP_RATES;
 173         supp_rates[1] = 0;
 174         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 175
 176         for (i = 0; i < sband->n_bitrates; i++) {
 177                 struct ieee80211_rate *rate = &sband->bitrates[i];
 178                 if (esupp_rates) {
 179                         pos = skb_put(skb, 1);
 180                         esupp_rates[1]++;
 181                 } else if (supp_rates[1] == 8) {
 182                         esupp_rates = skb_put(skb, 3);
 183                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 184                         esupp_rates[1] = 1;
 185                         pos = &esupp_rates[2];
 186                 } else {
 187                         pos = skb_put(skb, 1);
 188                         supp_rates[1]++;
 189                 }
 190                 *pos = rate->bitrate / 5;
 191         }
 192
 193         ieee80211_tx_skb(sdata, skb, 0);
 194 }
 195
 196 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 197                                 struct ieee80211_if_sta *ifsta,
 198                                 int transaction, u8 *extra, size_t extra_len,
 199                                 int encrypt)
 200 {
 201         struct ieee80211_local *local = sdata->local;
 202         struct sk_buff *skb;
 203         struct ieee80211_mgmt *mgmt;
 204
 205         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 206                             sizeof(*mgmt) + 6 + extra_len);
 207         if (!skb) {
 208                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 209                        "frame\n", sdata->dev->name);
 210                 return;
 211         }
 212         skb_reserve(skb, local->hw.extra_tx_headroom);
 213
 214         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 215         memset(mgmt, 0, 24 + 6);
 216         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 217                                           IEEE80211_STYPE_AUTH);
 218         if (encrypt)
 219                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 220         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 221         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 222         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 223         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
 224         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 225         ifsta->auth_transaction = transaction + 1;
 226         mgmt->u.auth.status_code = cpu_to_le16(0);
 227         if (extra)
 228                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 229
 230         ieee80211_tx_skb(sdata, skb, encrypt);
 231 }
 232
 233 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
 234                                  struct ieee80211_if_sta *ifsta)
 235 {
 236         struct ieee80211_local *local = sdata->local;
 237         struct sk_buff *skb;
 238         struct ieee80211_mgmt *mgmt;
 239         u8 *pos, *ies, *ht_add_ie;
 240         int i, len, count, rates_len, supp_rates_len;
 241         u16 capab;
 242         struct ieee80211_bss *bss;
 243         int wmm = 0;
 244         struct ieee80211_supported_band *sband;
 245         u64 rates = 0;
 246
 247         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 248                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
 249                             ifsta->ssid_len);
 250         if (!skb) {
 251                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 252                        "frame\n", sdata->dev->name);
 253                 return;
 254         }
 255         skb_reserve(skb, local->hw.extra_tx_headroom);
 256
 257         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 258
 259         capab = ifsta->capab;
 260
 261         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 262                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 263                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 264                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 265                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 266         }
 267
 268         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 269                                    local->hw.conf.channel->center_freq,
 270                                    ifsta->ssid, ifsta->ssid_len);
 271         if (bss) {
 272                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 273                         capab |= WLAN_CAPABILITY_PRIVACY;
 274                 if (bss->wmm_used)
 275                         wmm = 1;
 276
 277                 /* get all rates supported by the device and the AP as
 278                  * some APs don't like getting a superset of their rates
 279                  * in the association request (e.g. D-Link DAP 1353 in
 280                  * b-only mode) */
 281                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 282
 283                 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 284                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 285                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 286
 287                 ieee80211_rx_bss_put(local, bss);
 288         } else {
 289                 rates = ~0;
 290                 rates_len = sband->n_bitrates;
 291         }
 292
 293         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 294         memset(mgmt, 0, 24);
 295         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 296         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 297         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 298
 299         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 300                 skb_put(skb, 10);
 301                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 302                                                   IEEE80211_STYPE_REASSOC_REQ);
 303                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 304                 mgmt->u.reassoc_req.listen_interval =
 305                                 cpu_to_le16(local->hw.conf.listen_interval);
 306                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
 307                        ETH_ALEN);
 308         } else {
 309                 skb_put(skb, 4);
 310                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 311                                                   IEEE80211_STYPE_ASSOC_REQ);
 312                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 313                 mgmt->u.reassoc_req.listen_interval =
 314                                 cpu_to_le16(local->hw.conf.listen_interval);
 315         }
 316
 317         /* SSID */
 318         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
 319         *pos++ = WLAN_EID_SSID;
 320         *pos++ = ifsta->ssid_len;
 321         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
 322
 323         /* add all rates which were marked to be used above */
 324         supp_rates_len = rates_len;
 325         if (supp_rates_len > 8)
 326                 supp_rates_len = 8;
 327
 328         len = sband->n_bitrates;
 329         pos = skb_put(skb, supp_rates_len + 2);
 330         *pos++ = WLAN_EID_SUPP_RATES;
 331         *pos++ = supp_rates_len;
 332
 333         count = 0;
 334         for (i = 0; i < sband->n_bitrates; i++) {
 335                 if (BIT(i) & rates) {
 336                         int rate = sband->bitrates[i].bitrate;
 337                         *pos++ = (u8) (rate / 5);
 338                         if (++count == 8)
 339                                 break;
 340                 }
 341         }
 342
 343         if (rates_len > count) {
 344                 pos = skb_put(skb, rates_len - count + 2);
 345                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 346                 *pos++ = rates_len - count;
 347
 348                 for (i++; i < sband->n_bitrates; i++) {
 349                         if (BIT(i) & rates) {
 350                                 int rate = sband->bitrates[i].bitrate;
 351                                 *pos++ = (u8) (rate / 5);
 352                         }
 353                 }
 354         }
 355
 356         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 357                 /* 1. power capabilities */
 358                 pos = skb_put(skb, 4);
 359                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 360                 *pos++ = 2;
 361                 *pos++ = 0; /* min tx power */
 362                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 363
 364                 /* 2. supported channels */
 365                 /* TODO: get this in reg domain format */
 366                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 367                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 368                 *pos++ = 2 * sband->n_channels;
 369                 for (i = 0; i < sband->n_channels; i++) {
 370                         *pos++ = ieee80211_frequency_to_channel(
 371                                         sband->channels[i].center_freq);
 372                         *pos++ = 1; /* one channel in the subband*/
 373                 }
 374         }
 375
 376         if (ifsta->extra_ie) {
 377                 pos = skb_put(skb, ifsta->extra_ie_len);
 378                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
 379         }
 380
 381         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
 382                 pos = skb_put(skb, 9);
 383                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 384                 *pos++ = 7; /* len */
 385                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 386                 *pos++ = 0x50;
 387                 *pos++ = 0xf2;
 388                 *pos++ = 2; /* WME */
 389                 *pos++ = 0; /* WME info */
 390                 *pos++ = 1; /* WME ver */
 391                 *pos++ = 0;
 392         }
 393
 394         /* wmm support is a must to HT */
 395         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
 396             sband->ht_info.ht_supported &&
 397             (ht_add_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_EXTRA_INFO))) {
 398                 struct ieee80211_ht_addt_info *ht_add_info =
 399                         (struct ieee80211_ht_addt_info *)ht_add_ie;
 400                 u16 cap = sband->ht_info.cap;
 401                 __le16 tmp;
 402                 u32 flags = local->hw.conf.channel->flags;
 403
 404                 switch (ht_add_info->ht_param & IEEE80211_HT_IE_CHA_SEC_OFFSET) {
 405                 case IEEE80211_HT_IE_CHA_SEC_ABOVE:
 406                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 407                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
 408                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 409                         }
 410                         break;
 411                 case IEEE80211_HT_IE_CHA_SEC_BELOW:
 412                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 413                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
 414                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 415                         }
 416                         break;
 417                 }
 418
 419                 tmp = cpu_to_le16(cap);
 420                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 421                 *pos++ = WLAN_EID_HT_CAPABILITY;
 422                 *pos++ = sizeof(struct ieee80211_ht_cap);
 423                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 424                 memcpy(pos, &tmp, sizeof(u16));
 425                 pos += sizeof(u16);
 426                 /* TODO: needs a define here for << 2 */
 427                 *pos++ = sband->ht_info.ampdu_factor |
 428                          (sband->ht_info.ampdu_density << 2);
 429                 memcpy(pos, sband->ht_info.supp_mcs_set, 16);
 430         }
 431
 432         kfree(ifsta->assocreq_ies);
 433         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
 434         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
 435         if (ifsta->assocreq_ies)
 436                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
 437
 438         ieee80211_tx_skb(sdata, skb, 0);
 439 }
 440
 441
 442 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 443                                            u16 stype, u16 reason)
 444 {
 445         struct ieee80211_local *local = sdata->local;
 446         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 447         struct sk_buff *skb;
 448         struct ieee80211_mgmt *mgmt;
 449
 450         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 451         if (!skb) {
 452                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 453                        "deauth/disassoc frame\n", sdata->dev->name);
 454                 return;
 455         }
 456         skb_reserve(skb, local->hw.extra_tx_headroom);
 457
 458         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 459         memset(mgmt, 0, 24);
 460         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 461         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 462         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 463         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 464         skb_put(skb, 2);
 465         /* u.deauth.reason_code == u.disassoc.reason_code */
 466         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 467
 468         ieee80211_tx_skb(sdata, skb, 0);
 469 }
 470
 471 /* MLME */
 472 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 473                                          struct ieee80211_bss *bss)
 474 {
 475         struct ieee80211_local *local = sdata->local;
 476         int i, have_higher_than_11mbit = 0;
 477
 478         /* cf. IEEE 802.11 9.2.12 */
 479         for (i = 0; i < bss->supp_rates_len; i++)
 480                 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
 481                         have_higher_than_11mbit = 1;
 482
 483         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 484             have_higher_than_11mbit)
 485                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 486         else
 487                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 488
 489         ieee80211_set_wmm_default(sdata);
 490 }
 491
 492 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 493                                      struct ieee80211_if_sta *ifsta,
 494                                      u8 *wmm_param, size_t wmm_param_len)
 495 {
 496         struct ieee80211_tx_queue_params params;
 497         size_t left;
 498         int count;
 499         u8 *pos;
 500
 501         if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
 502                 return;
 503
 504         if (!wmm_param)
 505                 return;
 506
 507         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 508                 return;
 509         count = wmm_param[6] & 0x0f;
 510         if (count == ifsta->wmm_last_param_set)
 511                 return;
 512         ifsta->wmm_last_param_set = count;
 513
 514         pos = wmm_param + 8;
 515         left = wmm_param_len - 8;
 516
 517         memset(&params, 0, sizeof(params));
 518
 519         if (!local->ops->conf_tx)
 520                 return;
 521
 522         local->wmm_acm = 0;
 523         for (; left >= 4; left -= 4, pos += 4) {
 524                 int aci = (pos[0] >> 5) & 0x03;
 525                 int acm = (pos[0] >> 4) & 0x01;
 526                 int queue;
 527
 528                 switch (aci) {
 529                 case 1:
 530                         queue = 3;
 531                         if (acm)
 532                                 local->wmm_acm |= BIT(0) | BIT(3);
 533                         break;
 534                 case 2:
 535                         queue = 1;
 536                         if (acm)
 537                                 local->wmm_acm |= BIT(4) | BIT(5);
 538                         break;
 539                 case 3:
 540                         queue = 0;
 541                         if (acm)
 542                                 local->wmm_acm |= BIT(6) | BIT(7);
 543                         break;
 544                 case 0:
 545                 default:
 546                         queue = 2;
 547                         if (acm)
 548                                 local->wmm_acm |= BIT(1) | BIT(2);
 549                         break;
 550                 }
 551
 552                 params.aifs = pos[0] & 0x0f;
 553                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 554                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 555                 params.txop = get_unaligned_le16(pos + 2);
 556 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 557                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 558                        "cWmin=%d cWmax=%d txop=%d\n",
 559                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 560                        params.cw_max, params.txop);
 561 #endif
 562                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
 563                  * AC for now) */
 564                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 565                         printk(KERN_DEBUG "%s: failed to set TX queue "
 566                                "parameters for queue %d\n", local->mdev->name, queue);
 567                 }
 568         }
 569 }
 570
 571 static u32 ieee80211_handle_protect_preamb(struct ieee80211_sub_if_data *sdata,
 572                                            bool use_protection,
 573                                            bool use_short_preamble)
 574 {
 575         struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
 576 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 577         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 578         DECLARE_MAC_BUF(mac);
 579 #endif
 580         u32 changed = 0;
 581
 582         if (use_protection != bss_conf->use_cts_prot) {
 583 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 584                 if (net_ratelimit()) {
 585                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
 586                                "%s)\n",
 587                                sdata->dev->name,
 588                                use_protection ? "enabled" : "disabled",
 589                                print_mac(mac, ifsta->bssid));
 590                 }
 591 #endif
 592                 bss_conf->use_cts_prot = use_protection;
 593                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 594         }
 595
 596         if (use_short_preamble != bss_conf->use_short_preamble) {
 597 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 598                 if (net_ratelimit()) {
 599                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 600                                " (BSSID=%s)\n",
 601                                sdata->dev->name,
 602                                use_short_preamble ? "short" : "long",
 603                                print_mac(mac, ifsta->bssid));
 604                 }
 605 #endif
 606                 bss_conf->use_short_preamble = use_short_preamble;
 607                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 608         }
 609
 610         return changed;
 611 }
 612
 613 static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
 614                                    u8 erp_value)
 615 {
 616         bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
 617         bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0;
 618
 619         return ieee80211_handle_protect_preamb(sdata,
 620                         use_protection, use_short_preamble);
 621 }
 622
 623 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 624                                            struct ieee80211_bss *bss)
 625 {
 626         u32 changed = 0;
 627
 628         if (bss->has_erp_value)
 629                 changed |= ieee80211_handle_erp_ie(sdata, bss->erp_value);
 630         else {
 631                 u16 capab = bss->capability;
 632                 changed |= ieee80211_handle_protect_preamb(sdata, false,
 633                                 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
 634         }
 635
 636         return changed;
 637 }
 638
 639 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
 640                                         struct ieee80211_if_sta *ifsta)
 641 {
 642         union iwreq_data wrqu;
 643         memset(&wrqu, 0, sizeof(wrqu));
 644         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
 645                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
 646         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 647         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 648 }
 649
 650 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
 651                                          struct ieee80211_if_sta *ifsta)
 652 {
 653         union iwreq_data wrqu;
 654
 655         if (ifsta->assocreq_ies) {
 656                 memset(&wrqu, 0, sizeof(wrqu));
 657                 wrqu.data.length = ifsta->assocreq_ies_len;
 658                 wireless_send_event(sdata->dev, IWEVASSOCREQIE, &wrqu,
 659                                     ifsta->assocreq_ies);
 660         }
 661         if (ifsta->assocresp_ies) {
 662                 memset(&wrqu, 0, sizeof(wrqu));
 663                 wrqu.data.length = ifsta->assocresp_ies_len;
 664                 wireless_send_event(sdata->dev, IWEVASSOCRESPIE, &wrqu,
 665                                     ifsta->assocresp_ies);
 666         }
 667 }
 668
 669
 670 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 671                                      struct ieee80211_if_sta *ifsta)
 672 {
 673         struct ieee80211_local *local = sdata->local;
 674         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 675         u32 changed = BSS_CHANGED_ASSOC;
 676
 677         struct ieee80211_bss *bss;
 678
 679         ifsta->flags |= IEEE80211_STA_ASSOCIATED;
 680
 681         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
 682                 return;
 683
 684         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 685                                    conf->channel->center_freq,
 686                                    ifsta->ssid, ifsta->ssid_len);
 687         if (bss) {
 688                 /* set timing information */
 689                 sdata->bss_conf.beacon_int = bss->beacon_int;
 690                 sdata->bss_conf.timestamp = bss->timestamp;
 691                 sdata->bss_conf.dtim_period = bss->dtim_period;
 692
 693                 changed |= ieee80211_handle_bss_capability(sdata, bss);
 694
 695                 ieee80211_rx_bss_put(local, bss);
 696         }
 697
 698         if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
 699                 changed |= BSS_CHANGED_HT;
 700                 sdata->bss_conf.assoc_ht = 1;
 701                 sdata->bss_conf.ht_conf = &conf->ht_conf;
 702                 sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf;
 703         }
 704
 705         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
 706         memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 707         ieee80211_sta_send_associnfo(sdata, ifsta);
 708
 709         ifsta->last_probe = jiffies;
 710         ieee80211_led_assoc(local, 1);
 711
 712         sdata->bss_conf.assoc = 1;
 713         ieee80211_bss_info_change_notify(sdata, changed);
 714
 715         netif_tx_start_all_queues(sdata->dev);
 716         netif_carrier_on(sdata->dev);
 717
 718         ieee80211_sta_send_apinfo(sdata, ifsta);
 719 }
 720
 721 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
 722                                    struct ieee80211_if_sta *ifsta)
 723 {
 724         DECLARE_MAC_BUF(mac);
 725
 726         ifsta->direct_probe_tries++;
 727         if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 728                 printk(KERN_DEBUG "%s: direct probe to AP %s timed out\n",
 729                        sdata->dev->name, print_mac(mac, ifsta->bssid));
 730                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 731                 return;
 732         }
 733
 734         printk(KERN_DEBUG "%s: direct probe to AP %s try %d\n",
 735                         sdata->dev->name, print_mac(mac, ifsta->bssid),
 736                         ifsta->direct_probe_tries);
 737
 738         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 739
 740         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
 741
 742         /* Direct probe is sent to broadcast address as some APs
 743          * will not answer to direct packet in unassociated state.
 744          */
 745         ieee80211_send_probe_req(sdata, NULL,
 746                                  ifsta->ssid, ifsta->ssid_len);
 747
 748         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 749 }
 750
 751
 752 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
 753                                    struct ieee80211_if_sta *ifsta)
 754 {
 755         DECLARE_MAC_BUF(mac);
 756
 757         ifsta->auth_tries++;
 758         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 759                 printk(KERN_DEBUG "%s: authentication with AP %s"
 760                        " timed out\n",
 761                        sdata->dev->name, print_mac(mac, ifsta->bssid));
 762                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 763                 return;
 764         }
 765
 766         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
 767         printk(KERN_DEBUG "%s: authenticate with AP %s\n",
 768                sdata->dev->name, print_mac(mac, ifsta->bssid));
 769
 770         ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
 771
 772         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 773 }
 774
 775 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 776                                    struct ieee80211_if_sta *ifsta, bool deauth,
 777                                    bool self_disconnected, u16 reason)
 778 {
 779         struct ieee80211_local *local = sdata->local;
 780         struct sta_info *sta;
 781         u32 changed = BSS_CHANGED_ASSOC;
 782
 783         rcu_read_lock();
 784
 785         sta = sta_info_get(local, ifsta->bssid);
 786         if (!sta) {
 787                 rcu_read_unlock();
 788                 return;
 789         }
 790
 791         if (deauth) {
 792                 ifsta->direct_probe_tries = 0;
 793                 ifsta->auth_tries = 0;
 794         }
 795         ifsta->assoc_scan_tries = 0;
 796         ifsta->assoc_tries = 0;
 797
 798         netif_tx_stop_all_queues(sdata->dev);
 799         netif_carrier_off(sdata->dev);
 800
 801         ieee80211_sta_tear_down_BA_sessions(sdata, sta->addr);
 802
 803         if (self_disconnected) {
 804                 if (deauth)
 805                         ieee80211_send_deauth_disassoc(sdata,
 806                                 IEEE80211_STYPE_DEAUTH, reason);
 807                 else
 808                         ieee80211_send_deauth_disassoc(sdata,
 809                                 IEEE80211_STYPE_DISASSOC, reason);
 810         }
 811
 812         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
 813         changed |= ieee80211_reset_erp_info(sdata);
 814
 815         if (sdata->bss_conf.assoc_ht)
 816                 changed |= BSS_CHANGED_HT;
 817
 818         sdata->bss_conf.assoc_ht = 0;
 819         sdata->bss_conf.ht_conf = NULL;
 820         sdata->bss_conf.ht_bss_conf = NULL;
 821
 822         ieee80211_led_assoc(local, 0);
 823         sdata->bss_conf.assoc = 0;
 824
 825         ieee80211_sta_send_apinfo(sdata, ifsta);
 826
 827         if (self_disconnected)
 828                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 829
 830         sta_info_unlink(&sta);
 831
 832         rcu_read_unlock();
 833
 834         sta_info_destroy(sta);
 835 }
 836
 837 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
 838 {
 839         if (!sdata || !sdata->default_key ||
 840             sdata->default_key->conf.alg != ALG_WEP)
 841                 return 0;
 842         return 1;
 843 }
 844
 845 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
 846                                       struct ieee80211_if_sta *ifsta)
 847 {
 848         struct ieee80211_local *local = sdata->local;
 849         struct ieee80211_bss *bss;
 850         int bss_privacy;
 851         int wep_privacy;
 852         int privacy_invoked;
 853
 854         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
 855                 return 0;
 856
 857         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 858                                    local->hw.conf.channel->center_freq,
 859                                    ifsta->ssid, ifsta->ssid_len);
 860         if (!bss)
 861                 return 0;
 862
 863         bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
 864         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
 865         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
 866
 867         ieee80211_rx_bss_put(local, bss);
 868
 869         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
 870                 return 0;
 871
 872         return 1;
 873 }
 874
 875 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
 876                                 struct ieee80211_if_sta *ifsta)
 877 {
 878         DECLARE_MAC_BUF(mac);
 879
 880         ifsta->assoc_tries++;
 881         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 882                 printk(KERN_DEBUG "%s: association with AP %s"
 883                        " timed out\n",
 884                        sdata->dev->name, print_mac(mac, ifsta->bssid));
 885                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 886                 return;
 887         }
 888
 889         ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
 890         printk(KERN_DEBUG "%s: associate with AP %s\n",
 891                sdata->dev->name, print_mac(mac, ifsta->bssid));
 892         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
 893                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 894                        "mixed-cell disabled - abort association\n", sdata->dev->name);
 895                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 896                 return;
 897         }
 898
 899         ieee80211_send_assoc(sdata, ifsta);
 900
 901         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 902 }
 903
 904
 905 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
 906                                  struct ieee80211_if_sta *ifsta)
 907 {
 908         struct ieee80211_local *local = sdata->local;
 909         struct sta_info *sta;
 910         int disassoc;
 911         DECLARE_MAC_BUF(mac);
 912
 913         /* TODO: start monitoring current AP signal quality and number of
 914          * missed beacons. Scan other channels every now and then and search
 915          * for better APs. */
 916         /* TODO: remove expired BSSes */
 917
 918         ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
 919
 920         rcu_read_lock();
 921
 922         sta = sta_info_get(local, ifsta->bssid);
 923         if (!sta) {
 924                 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
 925                        sdata->dev->name, print_mac(mac, ifsta->bssid));
 926                 disassoc = 1;
 927         } else {
 928                 disassoc = 0;
 929                 if (time_after(jiffies,
 930                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 931                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
 932                                 printk(KERN_DEBUG "%s: No ProbeResp from "
 933                                        "current AP %s - assume out of "
 934                                        "range\n",
 935                                        sdata->dev->name, print_mac(mac, ifsta->bssid));
 936                                 disassoc = 1;
 937                         } else
 938                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
 939                                                          local->scan_ssid,
 940                                                          local->scan_ssid_len);
 941                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
 942                 } else {
 943                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
 944                         if (time_after(jiffies, ifsta->last_probe +
 945                                        IEEE80211_PROBE_INTERVAL)) {
 946                                 ifsta->last_probe = jiffies;
 947                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
 948                                                          ifsta->ssid,
 949                                                          ifsta->ssid_len);
 950                         }
 951                 }
 952         }
 953
 954         rcu_read_unlock();
 955
 956         if (disassoc)
 957                 ieee80211_set_disassoc(sdata, ifsta, true, true,
 958                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
 959         else
 960                 mod_timer(&ifsta->timer, jiffies +
 961                                       IEEE80211_MONITORING_INTERVAL);
 962 }
 963
 964
 965 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
 966                                      struct ieee80211_if_sta *ifsta)
 967 {
 968         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
 969         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
 970         ieee80211_associate(sdata, ifsta);
 971 }
 972
 973
 974 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
 975                                      struct ieee80211_if_sta *ifsta,
 976                                      struct ieee80211_mgmt *mgmt,
 977                                      size_t len)
 978 {
 979         u8 *pos;
 980         struct ieee802_11_elems elems;
 981
 982         pos = mgmt->u.auth.variable;
 983         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
 984         if (!elems.challenge)
 985                 return;
 986         ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
 987                             elems.challenge_len + 2, 1);
 988 }
 989
 990 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
 991                                    struct ieee80211_if_sta *ifsta,
 992                                    struct ieee80211_mgmt *mgmt,
 993                                    size_t len)
 994 {
 995         u16 auth_alg, auth_transaction, status_code;
 996         DECLARE_MAC_BUF(mac);
 997
 998         if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
 999             sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
1000                 return;
1001
1002         if (len < 24 + 6)
1003                 return;
1004
1005         if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1006             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1007                 return;
1008
1009         if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1010             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1011                 return;
1012
1013         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1014         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1015         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1016
1017         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1018                 /*
1019                  * IEEE 802.11 standard does not require authentication in IBSS
1020                  * networks and most implementations do not seem to use it.
1021                  * However, try to reply to authentication attempts if someone
1022                  * has actually implemented this.
1023                  */
1024                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1025                         return;
1026                 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1027         }
1028
1029         if (auth_alg != ifsta->auth_alg ||
1030             auth_transaction != ifsta->auth_transaction)
1031                 return;
1032
1033         if (status_code != WLAN_STATUS_SUCCESS) {
1034                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1035                         u8 algs[3];
1036                         const int num_algs = ARRAY_SIZE(algs);
1037                         int i, pos;
1038                         algs[0] = algs[1] = algs[2] = 0xff;
1039                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1040                                 algs[0] = WLAN_AUTH_OPEN;
1041                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1042                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1043                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1044                                 algs[2] = WLAN_AUTH_LEAP;
1045                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1046                                 pos = 0;
1047                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1048                                 pos = 1;
1049                         else
1050                                 pos = 2;
1051                         for (i = 0; i < num_algs; i++) {
1052                                 pos++;
1053                                 if (pos >= num_algs)
1054                                         pos = 0;
1055                                 if (algs[pos] == ifsta->auth_alg ||
1056                                     algs[pos] == 0xff)
1057                                         continue;
1058                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1059                                     !ieee80211_sta_wep_configured(sdata))
1060                                         continue;
1061                                 ifsta->auth_alg = algs[pos];
1062                                 break;
1063                         }
1064                 }
1065                 return;
1066         }
1067
1068         switch (ifsta->auth_alg) {
1069         case WLAN_AUTH_OPEN:
1070         case WLAN_AUTH_LEAP:
1071                 ieee80211_auth_completed(sdata, ifsta);
1072                 break;
1073         case WLAN_AUTH_SHARED_KEY:
1074                 if (ifsta->auth_transaction == 4)
1075                         ieee80211_auth_completed(sdata, ifsta);
1076                 else
1077                         ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1078                 break;
1079         }
1080 }
1081
1082
1083 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1084                                      struct ieee80211_if_sta *ifsta,
1085                                      struct ieee80211_mgmt *mgmt,
1086                                      size_t len)
1087 {
1088         u16 reason_code;
1089         DECLARE_MAC_BUF(mac);
1090
1091         if (len < 24 + 2)
1092                 return;
1093
1094         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1095                 return;
1096
1097         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1098
1099         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1100                 printk(KERN_DEBUG "%s: deauthenticated\n", sdata->dev->name);
1101
1102         if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1103             ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1104             ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1105                 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1106                 mod_timer(&ifsta->timer, jiffies +
1107                                       IEEE80211_RETRY_AUTH_INTERVAL);
1108         }
1109
1110         ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1111         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1112 }
1113
1114
1115 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1116                                        struct ieee80211_if_sta *ifsta,
1117                                        struct ieee80211_mgmt *mgmt,
1118                                        size_t len)
1119 {
1120         u16 reason_code;
1121         DECLARE_MAC_BUF(mac);
1122
1123         if (len < 24 + 2)
1124                 return;
1125
1126         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1127                 return;
1128
1129         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1130
1131         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1132                 printk(KERN_DEBUG "%s: disassociated\n", sdata->dev->name);
1133
1134         if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1135                 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1136                 mod_timer(&ifsta->timer, jiffies +
1137                                       IEEE80211_RETRY_AUTH_INTERVAL);
1138         }
1139
1140         ieee80211_set_disassoc(sdata, ifsta, false, false, 0);
1141 }
1142
1143
1144 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1145                                          struct ieee80211_if_sta *ifsta,
1146                                          struct ieee80211_mgmt *mgmt,
1147                                          size_t len,
1148                                          int reassoc)
1149 {
1150         struct ieee80211_local *local = sdata->local;
1151         struct ieee80211_supported_band *sband;
1152         struct sta_info *sta;
1153         u64 rates, basic_rates;
1154         u16 capab_info, status_code, aid;
1155         struct ieee802_11_elems elems;
1156         struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
1157         u8 *pos;
1158         int i, j;
1159         DECLARE_MAC_BUF(mac);
1160         bool have_higher_than_11mbit = false;
1161
1162         /* AssocResp and ReassocResp have identical structure, so process both
1163          * of them in this function. */
1164
1165         if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1166                 return;
1167
1168         if (len < 24 + 6)
1169                 return;
1170
1171         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1172                 return;
1173
1174         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1175         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1176         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1177
1178         printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
1179                "status=%d aid=%d)\n",
1180                sdata->dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
1181                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1182
1183         if (status_code != WLAN_STATUS_SUCCESS) {
1184                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1185                        sdata->dev->name, status_code);
1186                 /* if this was a reassociation, ensure we try a "full"
1187                  * association next time. This works around some broken APs
1188                  * which do not correctly reject reassociation requests. */
1189                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1190                 return;
1191         }
1192
1193         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1194                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1195                        "set\n", sdata->dev->name, aid);
1196         aid &= ~(BIT(15) | BIT(14));
1197
1198         pos = mgmt->u.assoc_resp.variable;
1199         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1200
1201         if (!elems.supp_rates) {
1202                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1203                        sdata->dev->name);
1204                 return;
1205         }
1206
1207         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1208         ifsta->aid = aid;
1209         ifsta->ap_capab = capab_info;
1210
1211         kfree(ifsta->assocresp_ies);
1212         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1213         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1214         if (ifsta->assocresp_ies)
1215                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1216
1217         rcu_read_lock();
1218
1219         /* Add STA entry for the AP */
1220         sta = sta_info_get(local, ifsta->bssid);
1221         if (!sta) {
1222                 struct ieee80211_bss *bss;
1223                 int err;
1224
1225                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1226                 if (!sta) {
1227                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1228                                " the AP\n", sdata->dev->name);
1229                         rcu_read_unlock();
1230                         return;
1231                 }
1232                 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1233                                            local->hw.conf.channel->center_freq,
1234                                            ifsta->ssid, ifsta->ssid_len);
1235                 if (bss) {
1236                         sta->last_signal = bss->signal;
1237                         sta->last_qual = bss->qual;
1238                         sta->last_noise = bss->noise;
1239                         ieee80211_rx_bss_put(local, bss);
1240                 }
1241
1242                 err = sta_info_insert(sta);
1243                 if (err) {
1244                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1245                                " the AP (error %d)\n", sdata->dev->name, err);
1246                         rcu_read_unlock();
1247                         return;
1248                 }
1249                 /* update new sta with its last rx activity */
1250                 sta->last_rx = jiffies;
1251         }
1252
1253         /*
1254          * FIXME: Do we really need to update the sta_info's information here?
1255          *        We already know about the AP (we found it in our list) so it
1256          *        should already be filled with the right info, no?
1257          *        As is stands, all this is racy because typically we assume
1258          *        the information that is filled in here (except flags) doesn't
1259          *        change while a STA structure is alive. As such, it should move
1260          *        to between the sta_info_alloc() and sta_info_insert() above.
1261          */
1262
1263         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1264                            WLAN_STA_AUTHORIZED);
1265
1266         rates = 0;
1267         basic_rates = 0;
1268         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1269
1270         for (i = 0; i < elems.supp_rates_len; i++) {
1271                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1272
1273                 if (rate > 110)
1274                         have_higher_than_11mbit = true;
1275
1276                 for (j = 0; j < sband->n_bitrates; j++) {
1277                         if (sband->bitrates[j].bitrate == rate)
1278                                 rates |= BIT(j);
1279                         if (elems.supp_rates[i] & 0x80)
1280                                 basic_rates |= BIT(j);
1281                 }
1282         }
1283
1284         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1285                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1286
1287                 if (rate > 110)
1288                         have_higher_than_11mbit = true;
1289
1290                 for (j = 0; j < sband->n_bitrates; j++) {
1291                         if (sband->bitrates[j].bitrate == rate)
1292                                 rates |= BIT(j);
1293                         if (elems.ext_supp_rates[i] & 0x80)
1294                                 basic_rates |= BIT(j);
1295                 }
1296         }
1297
1298         sta->supp_rates[local->hw.conf.channel->band] = rates;
1299         sdata->basic_rates = basic_rates;
1300
1301         /* cf. IEEE 802.11 9.2.12 */
1302         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1303             have_higher_than_11mbit)
1304                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1305         else
1306                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1307
1308         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1309             (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
1310                 struct ieee80211_ht_bss_info bss_info;
1311                 ieee80211_ht_cap_ie_to_ht_info(
1312                                 (struct ieee80211_ht_cap *)
1313                                 elems.ht_cap_elem, &sta->ht_info);
1314                 ieee80211_ht_addt_info_ie_to_ht_bss_info(
1315                                 (struct ieee80211_ht_addt_info *)
1316                                 elems.ht_info_elem, &bss_info);
1317                 ieee80211_handle_ht(local, 1, &sta->ht_info, &bss_info);
1318         }
1319
1320         rate_control_rate_init(sta, local);
1321
1322         if (elems.wmm_param) {
1323                 set_sta_flags(sta, WLAN_STA_WME);
1324                 rcu_read_unlock();
1325                 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1326                                          elems.wmm_param_len);
1327         } else
1328                 rcu_read_unlock();
1329
1330         /* set AID and assoc capability,
1331          * ieee80211_set_associated() will tell the driver */
1332         bss_conf->aid = aid;
1333         bss_conf->assoc_capability = capab_info;
1334         ieee80211_set_associated(sdata, ifsta);
1335
1336         ieee80211_associated(sdata, ifsta);
1337 }
1338
1339
1340 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1341                                    struct ieee80211_if_sta *ifsta,
1342                                    struct ieee80211_bss *bss)
1343 {
1344         struct ieee80211_local *local = sdata->local;
1345         int res, rates, i, j;
1346         struct sk_buff *skb;
1347         struct ieee80211_mgmt *mgmt;
1348         u8 *pos;
1349         struct ieee80211_supported_band *sband;
1350         union iwreq_data wrqu;
1351
1352         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1353
1354         /* Remove possible STA entries from other IBSS networks. */
1355         sta_info_flush_delayed(sdata);
1356
1357         if (local->ops->reset_tsf) {
1358                 /* Reset own TSF to allow time synchronization work. */
1359                 local->ops->reset_tsf(local_to_hw(local));
1360         }
1361         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1362         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1363         if (res)
1364                 return res;
1365
1366         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1367
1368         sdata->drop_unencrypted = bss->capability &
1369                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1370
1371         res = ieee80211_set_freq(sdata, bss->freq);
1372
1373         if (res)
1374                 return res;
1375
1376         /* Build IBSS probe response */
1377         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
1378         if (skb) {
1379                 skb_reserve(skb, local->hw.extra_tx_headroom);
1380
1381                 mgmt = (struct ieee80211_mgmt *)
1382                         skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1383                 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1384                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1385                                                   IEEE80211_STYPE_PROBE_RESP);
1386                 memset(mgmt->da, 0xff, ETH_ALEN);
1387                 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1388                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1389                 mgmt->u.beacon.beacon_int =
1390                         cpu_to_le16(local->hw.conf.beacon_int);
1391                 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1392                 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1393
1394                 pos = skb_put(skb, 2 + ifsta->ssid_len);
1395                 *pos++ = WLAN_EID_SSID;
1396                 *pos++ = ifsta->ssid_len;
1397                 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1398
1399                 rates = bss->supp_rates_len;
1400                 if (rates > 8)
1401                         rates = 8;
1402                 pos = skb_put(skb, 2 + rates);
1403                 *pos++ = WLAN_EID_SUPP_RATES;
1404                 *pos++ = rates;
1405                 memcpy(pos, bss->supp_rates, rates);
1406
1407                 if (bss->band == IEEE80211_BAND_2GHZ) {
1408                         pos = skb_put(skb, 2 + 1);
1409                         *pos++ = WLAN_EID_DS_PARAMS;
1410                         *pos++ = 1;
1411                         *pos++ = ieee80211_frequency_to_channel(bss->freq);
1412                 }
1413
1414                 pos = skb_put(skb, 2 + 2);
1415                 *pos++ = WLAN_EID_IBSS_PARAMS;
1416                 *pos++ = 2;
1417                 /* FIX: set ATIM window based on scan results */
1418                 *pos++ = 0;
1419                 *pos++ = 0;
1420
1421                 if (bss->supp_rates_len > 8) {
1422                         rates = bss->supp_rates_len - 8;
1423                         pos = skb_put(skb, 2 + rates);
1424                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
1425                         *pos++ = rates;
1426                         memcpy(pos, &bss->supp_rates[8], rates);
1427                 }
1428
1429                 ifsta->probe_resp = skb;
1430
1431                 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1432         }
1433
1434         rates = 0;
1435         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1436         for (i = 0; i < bss->supp_rates_len; i++) {
1437                 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1438                 for (j = 0; j < sband->n_bitrates; j++)
1439                         if (sband->bitrates[j].bitrate == bitrate)
1440                                 rates |= BIT(j);
1441         }
1442         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1443
1444         ieee80211_sta_def_wmm_params(sdata, bss);
1445
1446         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1447         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1448
1449         memset(&wrqu, 0, sizeof(wrqu));
1450         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1451         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1452
1453         return res;
1454 }
1455
1456 static u64 ieee80211_sta_get_mandatory_rates(struct ieee80211_local *local,
1457                                         enum ieee80211_band band)
1458 {
1459         struct ieee80211_supported_band *sband;
1460         struct ieee80211_rate *bitrates;
1461         u64 mandatory_rates;
1462         enum ieee80211_rate_flags mandatory_flag;
1463         int i;
1464
1465         sband = local->hw.wiphy->bands[band];
1466         if (!sband) {
1467                 WARN_ON(1);
1468                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1469         }
1470
1471         if (band == IEEE80211_BAND_2GHZ)
1472                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
1473         else
1474                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
1475
1476         bitrates = sband->bitrates;
1477         mandatory_rates = 0;
1478         for (i = 0; i < sband->n_bitrates; i++)
1479                 if (bitrates[i].flags & mandatory_flag)
1480                         mandatory_rates |= BIT(i);
1481         return mandatory_rates;
1482 }
1483
1484 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1485                                   struct ieee80211_mgmt *mgmt,
1486                                   size_t len,
1487                                   struct ieee80211_rx_status *rx_status,
1488                                   struct ieee802_11_elems *elems,
1489                                   bool beacon)
1490 {
1491         struct ieee80211_local *local = sdata->local;
1492         int freq;
1493         struct ieee80211_bss *bss;
1494         struct sta_info *sta;
1495         struct ieee80211_channel *channel;
1496         u64 beacon_timestamp, rx_timestamp;
1497         u64 supp_rates = 0;
1498         enum ieee80211_band band = rx_status->band;
1499         DECLARE_MAC_BUF(mac);
1500         DECLARE_MAC_BUF(mac2);
1501
1502         if (elems->ds_params && elems->ds_params_len == 1)
1503                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1504         else
1505                 freq = rx_status->freq;
1506
1507         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1508
1509         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1510                 return;
1511
1512         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && elems->supp_rates &&
1513             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1514                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1515
1516                 rcu_read_lock();
1517
1518                 sta = sta_info_get(local, mgmt->sa);
1519                 if (sta) {
1520                         u64 prev_rates;
1521
1522                         prev_rates = sta->supp_rates[band];
1523                         /* make sure mandatory rates are always added */
1524                         sta->supp_rates[band] = supp_rates |
1525                                 ieee80211_sta_get_mandatory_rates(local, band);
1526
1527 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1528                         if (sta->supp_rates[band] != prev_rates)
1529                                 printk(KERN_DEBUG "%s: updated supp_rates set "
1530                                     "for %s based on beacon info (0x%llx | "
1531                                     "0x%llx -> 0x%llx)\n",
1532                                     sdata->dev->name, print_mac(mac, sta->addr),
1533                                     (unsigned long long) prev_rates,
1534                                     (unsigned long long) supp_rates,
1535                                     (unsigned long long) sta->supp_rates[band]);
1536 #endif
1537                 } else {
1538                         ieee80211_ibss_add_sta(sdata, NULL, mgmt->bssid,
1539                                                mgmt->sa, supp_rates);
1540                 }
1541
1542                 rcu_read_unlock();
1543         }
1544
1545         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1546                                         freq, beacon);
1547         if (!bss)
1548                 return;
1549
1550         /* was just updated in ieee80211_bss_info_update */
1551         beacon_timestamp = bss->timestamp;
1552
1553         /*
1554          * In STA mode, the remaining parameters should not be overridden
1555          * by beacons because they're not necessarily accurate there.
1556          */
1557         if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1558             bss->last_probe_resp && beacon) {
1559                 ieee80211_rx_bss_put(local, bss);
1560                 return;
1561         }
1562
1563         /* check if we need to merge IBSS */
1564         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && beacon &&
1565             bss->capability & WLAN_CAPABILITY_IBSS &&
1566             bss->freq == local->oper_channel->center_freq &&
1567             elems->ssid_len == sdata->u.sta.ssid_len &&
1568             memcmp(elems->ssid, sdata->u.sta.ssid,
1569                                 sdata->u.sta.ssid_len) == 0) {
1570                 if (rx_status->flag & RX_FLAG_TSFT) {
1571                         /* in order for correct IBSS merging we need mactime
1572                          *
1573                          * since mactime is defined as the time the first data
1574                          * symbol of the frame hits the PHY, and the timestamp
1575                          * of the beacon is defined as "the time that the data
1576                          * symbol containing the first bit of the timestamp is
1577                          * transmitted to the PHY plus the transmitting STA’s
1578                          * delays through its local PHY from the MAC-PHY
1579                          * interface to its interface with the WM"
1580                          * (802.11 11.1.2) - equals the time this bit arrives at
1581                          * the receiver - we have to take into account the
1582                          * offset between the two.
1583                          * e.g: at 1 MBit that means mactime is 192 usec earlier
1584                          * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1585                          */
1586                         int rate = local->hw.wiphy->bands[band]->
1587                                         bitrates[rx_status->rate_idx].bitrate;
1588                         rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1589                 } else if (local && local->ops && local->ops->get_tsf)
1590                         /* second best option: get current TSF */
1591                         rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1592                 else
1593                         /* can't merge without knowing the TSF */
1594                         rx_timestamp = -1LLU;
1595 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1596                 printk(KERN_DEBUG "RX beacon SA=%s BSSID="
1597                        "%s TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1598                        print_mac(mac, mgmt->sa),
1599                        print_mac(mac2, mgmt->bssid),
1600                        (unsigned long long)rx_timestamp,
1601                        (unsigned long long)beacon_timestamp,
1602                        (unsigned long long)(rx_timestamp - beacon_timestamp),
1603                        jiffies);
1604 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1605                 if (beacon_timestamp > rx_timestamp) {
1606 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1607                         printk(KERN_DEBUG "%s: beacon TSF higher than "
1608                                "local TSF - IBSS merge with BSSID %s\n",
1609                                sdata->dev->name, print_mac(mac, mgmt->bssid));
1610 #endif
1611                         ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1612                         ieee80211_ibss_add_sta(sdata, NULL,
1613                                                mgmt->bssid, mgmt->sa,
1614                                                supp_rates);
1615                 }
1616         }
1617
1618         ieee80211_rx_bss_put(local, bss);
1619 }
1620
1621
1622 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1623                                          struct ieee80211_mgmt *mgmt,
1624                                          size_t len,
1625                                          struct ieee80211_rx_status *rx_status)
1626 {
1627         size_t baselen;
1628         struct ieee802_11_elems elems;
1629         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1630
1631         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1632                 return; /* ignore ProbeResp to foreign address */
1633
1634         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1635         if (baselen > len)
1636                 return;
1637
1638         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1639                                 &elems);
1640
1641         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1642
1643         /* direct probe may be part of the association flow */
1644         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1645                                                         &ifsta->request)) {
1646                 printk(KERN_DEBUG "%s direct probe responded\n",
1647                        sdata->dev->name);
1648                 ieee80211_authenticate(sdata, ifsta);
1649         }
1650 }
1651
1652
1653 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1654                                      struct ieee80211_mgmt *mgmt,
1655                                      size_t len,
1656                                      struct ieee80211_rx_status *rx_status)
1657 {
1658         struct ieee80211_if_sta *ifsta;
1659         size_t baselen;
1660         struct ieee802_11_elems elems;
1661         struct ieee80211_local *local = sdata->local;
1662         struct ieee80211_conf *conf = &local->hw.conf;
1663         u32 changed = 0;
1664
1665         /* Process beacon from the current BSS */
1666         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1667         if (baselen > len)
1668                 return;
1669
1670         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1671
1672         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1673
1674         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
1675                 return;
1676         ifsta = &sdata->u.sta;
1677
1678         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1679             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1680                 return;
1681
1682         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1683                                  elems.wmm_param_len);
1684
1685         if (elems.erp_info && elems.erp_info_len >= 1)
1686                 changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]);
1687         else {
1688                 u16 capab = le16_to_cpu(mgmt->u.beacon.capab_info);
1689                 changed |= ieee80211_handle_protect_preamb(sdata, false,
1690                                 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
1691         }
1692
1693         if (elems.ht_cap_elem && elems.ht_info_elem &&
1694             elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
1695                 struct ieee80211_ht_bss_info bss_info;
1696
1697                 ieee80211_ht_addt_info_ie_to_ht_bss_info(
1698                                 (struct ieee80211_ht_addt_info *)
1699                                 elems.ht_info_elem, &bss_info);
1700                 changed |= ieee80211_handle_ht(local, 1, &conf->ht_conf,
1701                                                &bss_info);
1702         }
1703
1704         ieee80211_bss_info_change_notify(sdata, changed);
1705 }
1706
1707
1708 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1709                                         struct ieee80211_if_sta *ifsta,
1710                                         struct ieee80211_mgmt *mgmt,
1711                                         size_t len,
1712                                         struct ieee80211_rx_status *rx_status)
1713 {
1714         struct ieee80211_local *local = sdata->local;
1715         int tx_last_beacon;
1716         struct sk_buff *skb;
1717         struct ieee80211_mgmt *resp;
1718         u8 *pos, *end;
1719         DECLARE_MAC_BUF(mac);
1720 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1721         DECLARE_MAC_BUF(mac2);
1722         DECLARE_MAC_BUF(mac3);
1723 #endif
1724
1725         if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS ||
1726             ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1727             len < 24 + 2 || !ifsta->probe_resp)
1728                 return;
1729
1730         if (local->ops->tx_last_beacon)
1731                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1732         else
1733                 tx_last_beacon = 1;
1734
1735 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1736         printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID="
1737                "%s (tx_last_beacon=%d)\n",
1738                sdata->dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da),
1739                print_mac(mac3, mgmt->bssid), tx_last_beacon);
1740 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1741
1742         if (!tx_last_beacon)
1743                 return;
1744
1745         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1746             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1747                 return;
1748
1749         end = ((u8 *) mgmt) + len;
1750         pos = mgmt->u.probe_req.variable;
1751         if (pos[0] != WLAN_EID_SSID ||
1752             pos + 2 + pos[1] > end) {
1753 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1754                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1755                        "from %s\n",
1756                        sdata->dev->name, print_mac(mac, mgmt->sa));
1757 #endif
1758                 return;
1759         }
1760         if (pos[1] != 0 &&
1761             (pos[1] != ifsta->ssid_len ||
1762              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1763                 /* Ignore ProbeReq for foreign SSID */
1764                 return;
1765         }
1766
1767         /* Reply with ProbeResp */
1768         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1769         if (!skb)
1770                 return;
1771
1772         resp = (struct ieee80211_mgmt *) skb->data;
1773         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1774 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1775         printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n",
1776                sdata->dev->name, print_mac(mac, resp->da));
1777 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1778         ieee80211_tx_skb(sdata, skb, 0);
1779 }
1780
1781 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1782                            struct ieee80211_rx_status *rx_status)
1783 {
1784         struct ieee80211_local *local = sdata->local;
1785         struct ieee80211_if_sta *ifsta;
1786         struct ieee80211_mgmt *mgmt;
1787         u16 fc;
1788
1789         if (skb->len < 24)
1790                 goto fail;
1791
1792         ifsta = &sdata->u.sta;
1793
1794         mgmt = (struct ieee80211_mgmt *) skb->data;
1795         fc = le16_to_cpu(mgmt->frame_control);
1796
1797         switch (fc & IEEE80211_FCTL_STYPE) {
1798         case IEEE80211_STYPE_PROBE_REQ:
1799         case IEEE80211_STYPE_PROBE_RESP:
1800         case IEEE80211_STYPE_BEACON:
1801                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1802         case IEEE80211_STYPE_AUTH:
1803         case IEEE80211_STYPE_ASSOC_RESP:
1804         case IEEE80211_STYPE_REASSOC_RESP:
1805         case IEEE80211_STYPE_DEAUTH:
1806         case IEEE80211_STYPE_DISASSOC:
1807                 skb_queue_tail(&ifsta->skb_queue, skb);
1808                 queue_work(local->hw.workqueue, &ifsta->work);
1809                 return;
1810         }
1811
1812  fail:
1813         kfree_skb(skb);
1814 }
1815
1816 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1817                                          struct sk_buff *skb)
1818 {
1819         struct ieee80211_rx_status *rx_status;
1820         struct ieee80211_if_sta *ifsta;
1821         struct ieee80211_mgmt *mgmt;
1822         u16 fc;
1823
1824         ifsta = &sdata->u.sta;
1825
1826         rx_status = (struct ieee80211_rx_status *) skb->cb;
1827         mgmt = (struct ieee80211_mgmt *) skb->data;
1828         fc = le16_to_cpu(mgmt->frame_control);
1829
1830         switch (fc & IEEE80211_FCTL_STYPE) {
1831         case IEEE80211_STYPE_PROBE_REQ:
1832                 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
1833                                             rx_status);
1834                 break;
1835         case IEEE80211_STYPE_PROBE_RESP:
1836                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1837                 break;
1838         case IEEE80211_STYPE_BEACON:
1839                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1840                 break;
1841         case IEEE80211_STYPE_AUTH:
1842                 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1843                 break;
1844         case IEEE80211_STYPE_ASSOC_RESP:
1845                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1846                 break;
1847         case IEEE80211_STYPE_REASSOC_RESP:
1848                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
1849                 break;
1850         case IEEE80211_STYPE_DEAUTH:
1851                 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
1852                 break;
1853         case IEEE80211_STYPE_DISASSOC:
1854                 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
1855                 break;
1856         }
1857
1858         kfree_skb(skb);
1859 }
1860
1861
1862 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
1863 {
1864         struct ieee80211_local *local = sdata->local;
1865         int active = 0;
1866         struct sta_info *sta;
1867
1868         rcu_read_lock();
1869
1870         list_for_each_entry_rcu(sta, &local->sta_list, list) {
1871                 if (sta->sdata == sdata &&
1872                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1873                                jiffies)) {
1874                         active++;
1875                         break;
1876                 }
1877         }
1878
1879         rcu_read_unlock();
1880
1881         return active;
1882 }
1883
1884
1885 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
1886                                      struct ieee80211_if_sta *ifsta)
1887 {
1888         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1889
1890         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
1891         if (ieee80211_sta_active_ibss(sdata))
1892                 return;
1893
1894         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1895                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
1896         ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
1897 }
1898
1899
1900 static void ieee80211_sta_timer(unsigned long data)
1901 {
1902         struct ieee80211_sub_if_data *sdata =
1903                 (struct ieee80211_sub_if_data *) data;
1904         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1905         struct ieee80211_local *local = sdata->local;
1906
1907         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1908         queue_work(local->hw.workqueue, &ifsta->work);
1909 }
1910
1911 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
1912                                      struct ieee80211_if_sta *ifsta)
1913 {
1914         struct ieee80211_local *local = sdata->local;
1915
1916         if (local->ops->reset_tsf) {
1917                 /* Reset own TSF to allow time synchronization work. */
1918                 local->ops->reset_tsf(local_to_hw(local));
1919         }
1920
1921         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
1922
1923
1924         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1925                 ifsta->auth_alg = WLAN_AUTH_OPEN;
1926         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1927                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
1928         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1929                 ifsta->auth_alg = WLAN_AUTH_LEAP;
1930         else
1931                 ifsta->auth_alg = WLAN_AUTH_OPEN;
1932         ifsta->auth_transaction = -1;
1933         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
1934         ifsta->assoc_scan_tries = 0;
1935         ifsta->direct_probe_tries = 0;
1936         ifsta->auth_tries = 0;
1937         ifsta->assoc_tries = 0;
1938         netif_tx_stop_all_queues(sdata->dev);
1939         netif_carrier_off(sdata->dev);
1940 }
1941
1942
1943 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
1944                                     const char *ssid, int ssid_len)
1945 {
1946         int tmp, hidden_ssid;
1947
1948         if (ssid_len == ifsta->ssid_len &&
1949             !memcmp(ifsta->ssid, ssid, ssid_len))
1950                 return 1;
1951
1952         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1953                 return 0;
1954
1955         hidden_ssid = 1;
1956         tmp = ssid_len;
1957         while (tmp--) {
1958                 if (ssid[tmp] != '\0') {
1959                         hidden_ssid = 0;
1960                         break;
1961                 }
1962         }
1963
1964         if (hidden_ssid && ifsta->ssid_len == ssid_len)
1965                 return 1;
1966
1967         if (ssid_len == 1 && ssid[0] == ' ')
1968                 return 1;
1969
1970         return 0;
1971 }
1972
1973 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
1974                                      struct ieee80211_if_sta *ifsta)
1975 {
1976         struct ieee80211_local *local = sdata->local;
1977         struct ieee80211_bss *bss;
1978         struct ieee80211_supported_band *sband;
1979         u8 bssid[ETH_ALEN], *pos;
1980         int i;
1981         int ret;
1982         DECLARE_MAC_BUF(mac);
1983
1984 #if 0
1985         /* Easier testing, use fixed BSSID. */
1986         memset(bssid, 0xfe, ETH_ALEN);
1987 #else
1988         /* Generate random, not broadcast, locally administered BSSID. Mix in
1989          * own MAC address to make sure that devices that do not have proper
1990          * random number generator get different BSSID. */
1991         get_random_bytes(bssid, ETH_ALEN);
1992         for (i = 0; i < ETH_ALEN; i++)
1993                 bssid[i] ^= sdata->dev->dev_addr[i];
1994         bssid[0] &= ~0x01;
1995         bssid[0] |= 0x02;
1996 #endif
1997
1998         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
1999                sdata->dev->name, print_mac(mac, bssid));
2000
2001         bss = ieee80211_rx_bss_add(local, bssid,
2002                                    local->hw.conf.channel->center_freq,
2003                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2004         if (!bss)
2005                 return -ENOMEM;
2006
2007         bss->band = local->hw.conf.channel->band;
2008         sband = local->hw.wiphy->bands[bss->band];
2009
2010         if (local->hw.conf.beacon_int == 0)
2011                 local->hw.conf.beacon_int = 100;
2012         bss->beacon_int = local->hw.conf.beacon_int;
2013         bss->last_update = jiffies;
2014         bss->capability = WLAN_CAPABILITY_IBSS;
2015
2016         if (sdata->default_key)
2017                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2018         else
2019                 sdata->drop_unencrypted = 0;
2020
2021         bss->supp_rates_len = sband->n_bitrates;
2022         pos = bss->supp_rates;
2023         for (i = 0; i < sband->n_bitrates; i++) {
2024                 int rate = sband->bitrates[i].bitrate;
2025                 *pos++ = (u8) (rate / 5);
2026         }
2027
2028         ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2029         ieee80211_rx_bss_put(local, bss);
2030         return ret;
2031 }
2032
2033
2034 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2035                                    struct ieee80211_if_sta *ifsta)
2036 {
2037         struct ieee80211_local *local = sdata->local;
2038         struct ieee80211_bss *bss;
2039         int found = 0;
2040         u8 bssid[ETH_ALEN];
2041         int active_ibss;
2042         DECLARE_MAC_BUF(mac);
2043         DECLARE_MAC_BUF(mac2);
2044
2045         if (ifsta->ssid_len == 0)
2046                 return -EINVAL;
2047
2048         active_ibss = ieee80211_sta_active_ibss(sdata);
2049 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2050         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2051                sdata->dev->name, active_ibss);
2052 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2053         spin_lock_bh(&local->bss_lock);
2054         list_for_each_entry(bss, &local->bss_list, list) {
2055                 if (ifsta->ssid_len != bss->ssid_len ||
2056                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2057                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2058                         continue;
2059 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2060                 printk(KERN_DEBUG "   bssid=%s found\n",
2061                        print_mac(mac, bss->bssid));
2062 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2063                 memcpy(bssid, bss->bssid, ETH_ALEN);
2064                 found = 1;
2065                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2066                         break;
2067         }
2068         spin_unlock_bh(&local->bss_lock);
2069
2070 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2071         if (found)
2072                 printk(KERN_DEBUG "   sta_find_ibss: selected %s current "
2073                        "%s\n", print_mac(mac, bssid),
2074                        print_mac(mac2, ifsta->bssid));
2075 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2076
2077         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2078                 int ret;
2079                 int search_freq;
2080
2081                 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2082                         search_freq = bss->freq;
2083                 else
2084                         search_freq = local->hw.conf.channel->center_freq;
2085
2086                 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2087                                            ifsta->ssid, ifsta->ssid_len);
2088                 if (!bss)
2089                         goto dont_join;
2090
2091                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
2092                        " based on configured SSID\n",
2093                        sdata->dev->name, print_mac(mac, bssid));
2094                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2095                 ieee80211_rx_bss_put(local, bss);
2096                 return ret;
2097         }
2098
2099 dont_join:
2100 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2101         printk(KERN_DEBUG "   did not try to join ibss\n");
2102 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2103
2104         /* Selected IBSS not found in current scan results - try to scan */
2105         if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2106             !ieee80211_sta_active_ibss(sdata)) {
2107                 mod_timer(&ifsta->timer, jiffies +
2108                                       IEEE80211_IBSS_MERGE_INTERVAL);
2109         } else if (time_after(jiffies, local->last_scan_completed +
2110                               IEEE80211_SCAN_INTERVAL)) {
2111                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2112                        "join\n", sdata->dev->name);
2113                 return ieee80211_request_scan(sdata, ifsta->ssid,
2114                                               ifsta->ssid_len);
2115         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2116                 int interval = IEEE80211_SCAN_INTERVAL;
2117
2118                 if (time_after(jiffies, ifsta->ibss_join_req +
2119                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2120                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2121                             (!(local->oper_channel->flags &
2122                                         IEEE80211_CHAN_NO_IBSS)))
2123                                 return ieee80211_sta_create_ibss(sdata, ifsta);
2124                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2125                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
2126                                        " %d MHz\n", sdata->dev->name,
2127                                        local->hw.conf.channel->center_freq);
2128                         }
2129
2130                         /* No IBSS found - decrease scan interval and continue
2131                          * scanning. */
2132                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2133                 }
2134
2135                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2136                 mod_timer(&ifsta->timer, jiffies + interval);
2137                 return 0;
2138         }
2139
2140         return 0;
2141 }
2142
2143
2144 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2145                                      struct ieee80211_if_sta *ifsta)
2146 {
2147         struct ieee80211_local *local = sdata->local;
2148         struct ieee80211_bss *bss, *selected = NULL;
2149         int top_rssi = 0, freq;
2150
2151         spin_lock_bh(&local->bss_lock);
2152         freq = local->oper_channel->center_freq;
2153         list_for_each_entry(bss, &local->bss_list, list) {
2154                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2155                         continue;
2156
2157                 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2158                         IEEE80211_STA_AUTO_BSSID_SEL |
2159                         IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2160                     (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2161                      !!sdata->default_key))
2162                         continue;
2163
2164                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2165                     bss->freq != freq)
2166                         continue;
2167
2168                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2169                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2170                         continue;
2171
2172                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2173                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2174                         continue;
2175
2176                 if (!selected || top_rssi < bss->signal) {
2177                         selected = bss;
2178                         top_rssi = bss->signal;
2179                 }
2180         }
2181         if (selected)
2182                 atomic_inc(&selected->users);
2183         spin_unlock_bh(&local->bss_lock);
2184
2185         if (selected) {
2186                 ieee80211_set_freq(sdata, selected->freq);
2187                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2188                         ieee80211_sta_set_ssid(sdata, selected->ssid,
2189                                                selected->ssid_len);
2190                 ieee80211_sta_set_bssid(sdata, selected->bssid);
2191                 ieee80211_sta_def_wmm_params(sdata, selected);
2192
2193                 /* Send out direct probe if no probe resp was received or
2194                  * the one we have is outdated
2195                  */
2196                 if (!selected->last_probe_resp ||
2197                     time_after(jiffies, selected->last_probe_resp
2198                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2199                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2200                 else
2201                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2202
2203                 ieee80211_rx_bss_put(local, selected);
2204                 ieee80211_sta_reset_auth(sdata, ifsta);
2205                 return 0;
2206         } else {
2207                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2208                         ifsta->assoc_scan_tries++;
2209                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2210                                 ieee80211_start_scan(sdata, NULL, 0);
2211                         else
2212                                 ieee80211_start_scan(sdata, ifsta->ssid,
2213                                                          ifsta->ssid_len);
2214                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2215                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2216                 } else
2217                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
2218         }
2219         return -1;
2220 }
2221
2222
2223 static void ieee80211_sta_work(struct work_struct *work)
2224 {
2225         struct ieee80211_sub_if_data *sdata =
2226                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2227         struct ieee80211_local *local = sdata->local;
2228         struct ieee80211_if_sta *ifsta;
2229         struct sk_buff *skb;
2230
2231         if (!netif_running(sdata->dev))
2232                 return;
2233
2234         if (local->sw_scanning || local->hw_scanning)
2235                 return;
2236
2237         if (WARN_ON(sdata->vif.type != IEEE80211_IF_TYPE_STA &&
2238                     sdata->vif.type != IEEE80211_IF_TYPE_IBSS))
2239                 return;
2240         ifsta = &sdata->u.sta;
2241
2242         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2243                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2244
2245         if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2246             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2247             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2248             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2249                 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2250                                      ifsta->scan_ssid_len);
2251                 return;
2252         }
2253
2254         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2255                 if (ieee80211_sta_config_auth(sdata, ifsta))
2256                         return;
2257                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2258         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2259                 return;
2260
2261         switch (ifsta->state) {
2262         case IEEE80211_STA_MLME_DISABLED:
2263                 break;
2264         case IEEE80211_STA_MLME_DIRECT_PROBE:
2265                 ieee80211_direct_probe(sdata, ifsta);
2266                 break;
2267         case IEEE80211_STA_MLME_AUTHENTICATE:
2268                 ieee80211_authenticate(sdata, ifsta);
2269                 break;
2270         case IEEE80211_STA_MLME_ASSOCIATE:
2271                 ieee80211_associate(sdata, ifsta);
2272                 break;
2273         case IEEE80211_STA_MLME_ASSOCIATED:
2274                 ieee80211_associated(sdata, ifsta);
2275                 break;
2276         case IEEE80211_STA_MLME_IBSS_SEARCH:
2277                 ieee80211_sta_find_ibss(sdata, ifsta);
2278                 break;
2279         case IEEE80211_STA_MLME_IBSS_JOINED:
2280                 ieee80211_sta_merge_ibss(sdata, ifsta);
2281                 break;
2282         default:
2283                 WARN_ON(1);
2284                 break;
2285         }
2286
2287         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2288                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2289                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2290
2291                 ieee80211_set_disassoc(sdata, ifsta, false, true,
2292                                         WLAN_REASON_UNSPECIFIED);
2293         }
2294 }
2295
2296 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2297 {
2298         if (sdata->vif.type == IEEE80211_IF_TYPE_STA)
2299                 queue_work(sdata->local->hw.workqueue,
2300                            &sdata->u.sta.work);
2301 }
2302
2303 /* interface setup */
2304 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2305 {
2306         struct ieee80211_if_sta *ifsta;
2307
2308         ifsta = &sdata->u.sta;
2309         INIT_WORK(&ifsta->work, ieee80211_sta_work);
2310         setup_timer(&ifsta->timer, ieee80211_sta_timer,
2311                     (unsigned long) sdata);
2312         skb_queue_head_init(&ifsta->skb_queue);
2313
2314         ifsta->capab = WLAN_CAPABILITY_ESS;
2315         ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2316                 IEEE80211_AUTH_ALG_SHARED_KEY;
2317         ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2318                 IEEE80211_STA_AUTO_BSSID_SEL |
2319                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2320         if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2321                 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2322 }
2323
2324 /*
2325  * Add a new IBSS station, will also be called by the RX code when,
2326  * in IBSS mode, receiving a frame from a yet-unknown station, hence
2327  * must be callable in atomic context.
2328  */
2329 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2330                                         struct sk_buff *skb, u8 *bssid,
2331                                         u8 *addr, u64 supp_rates)
2332 {
2333         struct ieee80211_local *local = sdata->local;
2334         struct sta_info *sta;
2335         DECLARE_MAC_BUF(mac);
2336         int band = local->hw.conf.channel->band;
2337
2338         /* TODO: Could consider removing the least recently used entry and
2339          * allow new one to be added. */
2340         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2341                 if (net_ratelimit()) {
2342                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2343                                "entry %s\n", sdata->dev->name, print_mac(mac, addr));
2344                 }
2345                 return NULL;
2346         }
2347
2348         if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2349                 return NULL;
2350
2351 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2352         printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n",
2353                wiphy_name(local->hw.wiphy), print_mac(mac, addr), sdata->dev->name);
2354 #endif
2355
2356         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2357         if (!sta)
2358                 return NULL;
2359
2360         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2361
2362         /* make sure mandatory rates are always added */
2363         sta->supp_rates[band] = supp_rates |
2364                         ieee80211_sta_get_mandatory_rates(local, band);
2365
2366         rate_control_rate_init(sta, local);
2367
2368         if (sta_info_insert(sta))
2369                 return NULL;
2370
2371         return sta;
2372 }
2373
2374 /* configuration hooks */
2375 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2376                             struct ieee80211_if_sta *ifsta)
2377 {
2378         struct ieee80211_local *local = sdata->local;
2379
2380         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
2381                 return;
2382
2383         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2384                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2385             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2386                              IEEE80211_STA_AUTO_SSID_SEL))) {
2387
2388                 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2389                         ieee80211_set_disassoc(sdata, ifsta, true, true,
2390                                                WLAN_REASON_DEAUTH_LEAVING);
2391
2392                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2393                 queue_work(local->hw.workqueue, &ifsta->work);
2394         }
2395 }
2396
2397 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2398 {
2399         struct ieee80211_if_sta *ifsta;
2400         int res;
2401
2402         if (len > IEEE80211_MAX_SSID_LEN)
2403                 return -EINVAL;
2404
2405         ifsta = &sdata->u.sta;
2406
2407         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2408                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2409                 memcpy(ifsta->ssid, ssid, len);
2410                 ifsta->ssid_len = len;
2411                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2412
2413                 res = 0;
2414                 /*
2415                  * Hack! MLME code needs to be cleaned up to have different
2416                  * entry points for configuration and internal selection change
2417                  */
2418                 if (netif_running(sdata->dev))
2419                         res = ieee80211_if_config(sdata, IEEE80211_IFCC_SSID);
2420                 if (res) {
2421                         printk(KERN_DEBUG "%s: Failed to config new SSID to "
2422                                "the low-level driver\n", sdata->dev->name);
2423                         return res;
2424                 }
2425         }
2426
2427         if (len)
2428                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2429         else
2430                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2431
2432         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
2433             !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2434                 ifsta->ibss_join_req = jiffies;
2435                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2436                 return ieee80211_sta_find_ibss(sdata, ifsta);
2437         }
2438
2439         return 0;
2440 }
2441
2442 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2443 {
2444         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2445         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2446         *len = ifsta->ssid_len;
2447         return 0;
2448 }
2449
2450 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2451 {
2452         struct ieee80211_if_sta *ifsta;
2453         int res;
2454
2455         ifsta = &sdata->u.sta;
2456
2457         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2458                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2459                 res = 0;
2460                 /*
2461                  * Hack! See also ieee80211_sta_set_ssid.
2462                  */
2463                 if (netif_running(sdata->dev))
2464                         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2465                 if (res) {
2466                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2467                                "the low-level driver\n", sdata->dev->name);
2468                         return res;
2469                 }
2470         }
2471
2472         if (is_valid_ether_addr(bssid))
2473                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2474         else
2475                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2476
2477         return 0;
2478 }
2479
2480 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2481 {
2482         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2483
2484         kfree(ifsta->extra_ie);
2485         if (len == 0) {
2486                 ifsta->extra_ie = NULL;
2487                 ifsta->extra_ie_len = 0;
2488                 return 0;
2489         }
2490         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2491         if (!ifsta->extra_ie) {
2492                 ifsta->extra_ie_len = 0;
2493                 return -ENOMEM;
2494         }
2495         memcpy(ifsta->extra_ie, ie, len);
2496         ifsta->extra_ie_len = len;
2497         return 0;
2498 }
2499
2500 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2501 {
2502         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2503
2504         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2505                sdata->dev->name, reason);
2506
2507         if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
2508             sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
2509                 return -EINVAL;
2510
2511         ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2512         return 0;
2513 }
2514
2515 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2516 {
2517         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2518
2519         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2520                sdata->dev->name, reason);
2521
2522         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
2523                 return -EINVAL;
2524
2525         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2526                 return -1;
2527
2528         ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2529         return 0;
2530 }
2531
2532 /* scan finished notification */
2533 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2534 {
2535         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2536         struct ieee80211_if_sta *ifsta;
2537
2538         if (sdata && sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
2539                 ifsta = &sdata->u.sta;
2540                 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2541                     (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2542                     !ieee80211_sta_active_ibss(sdata)))
2543                         ieee80211_sta_find_ibss(sdata, ifsta);
2544         }
2545
2546         /* Restart STA timers */
2547         rcu_read_lock();
2548         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2549                 ieee80211_restart_sta_timer(sdata);
2550         rcu_read_unlock();
2551 }
2552
2553 /* driver notification call */
2554 void ieee80211_notify_mac(struct ieee80211_hw *hw,
2555                           enum ieee80211_notification_types  notif_type)
2556 {
2557         struct ieee80211_local *local = hw_to_local(hw);
2558         struct ieee80211_sub_if_data *sdata;
2559
2560         switch (notif_type) {
2561         case IEEE80211_NOTIFY_RE_ASSOC:
2562                 rcu_read_lock();
2563                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2564                         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
2565                                 continue;
2566
2567                         ieee80211_sta_req_auth(sdata, &sdata->u.sta);
2568                 }
2569                 rcu_read_unlock();
2570                 break;
2571         }
2572 }
2573 EXPORT_SYMBOL(ieee80211_notify_mac);