SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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_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_cap.ht_supported &&
 397             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
 398             ht_ie[1] >= sizeof(struct ieee80211_ht_info)) {
 399                 struct ieee80211_ht_info *ht_info =
 400                         (struct ieee80211_ht_info *)(ht_ie + 2);
 401                 u16 cap = sband->ht_cap.cap;
 402                 __le16 tmp;
 403                 u32 flags = local->hw.conf.channel->flags;
 404
 405                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 406                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 407                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 408                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 409                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 410                         }
 411                         break;
 412                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 413                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 414                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 415                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 416                         }
 417                         break;
 418                 }
 419
 420                 tmp = cpu_to_le16(cap);
 421                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 422                 *pos++ = WLAN_EID_HT_CAPABILITY;
 423                 *pos++ = sizeof(struct ieee80211_ht_cap);
 424                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 425                 memcpy(pos, &tmp, sizeof(u16));
 426                 pos += sizeof(u16);
 427                 /* TODO: needs a define here for << 2 */
 428                 *pos++ = sband->ht_cap.ampdu_factor |
 429                          (sband->ht_cap.ampdu_density << 2);
 430                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 431         }
 432
 433         kfree(ifsta->assocreq_ies);
 434         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
 435         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
 436         if (ifsta->assocreq_ies)
 437                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
 438
 439         ieee80211_tx_skb(sdata, skb, 0);
 440 }
 441
 442
 443 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 444                                            u16 stype, u16 reason)
 445 {
 446         struct ieee80211_local *local = sdata->local;
 447         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 448         struct sk_buff *skb;
 449         struct ieee80211_mgmt *mgmt;
 450
 451         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 452         if (!skb) {
 453                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 454                        "deauth/disassoc frame\n", sdata->dev->name);
 455                 return;
 456         }
 457         skb_reserve(skb, local->hw.extra_tx_headroom);
 458
 459         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 460         memset(mgmt, 0, 24);
 461         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 462         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 463         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 464         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 465         skb_put(skb, 2);
 466         /* u.deauth.reason_code == u.disassoc.reason_code */
 467         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 468
 469         ieee80211_tx_skb(sdata, skb, 0);
 470 }
 471
 472 /* MLME */
 473 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 474                                          struct ieee80211_bss *bss)
 475 {
 476         struct ieee80211_local *local = sdata->local;
 477         int i, have_higher_than_11mbit = 0;
 478
 479         /* cf. IEEE 802.11 9.2.12 */
 480         for (i = 0; i < bss->supp_rates_len; i++)
 481                 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
 482                         have_higher_than_11mbit = 1;
 483
 484         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 485             have_higher_than_11mbit)
 486                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 487         else
 488                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 489
 490         ieee80211_set_wmm_default(sdata);
 491 }
 492
 493 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 494                                      struct ieee80211_if_sta *ifsta,
 495                                      u8 *wmm_param, size_t wmm_param_len)
 496 {
 497         struct ieee80211_tx_queue_params params;
 498         size_t left;
 499         int count;
 500         u8 *pos;
 501
 502         if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
 503                 return;
 504
 505         if (!wmm_param)
 506                 return;
 507
 508         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 509                 return;
 510         count = wmm_param[6] & 0x0f;
 511         if (count == ifsta->wmm_last_param_set)
 512                 return;
 513         ifsta->wmm_last_param_set = count;
 514
 515         pos = wmm_param + 8;
 516         left = wmm_param_len - 8;
 517
 518         memset(&params, 0, sizeof(params));
 519
 520         if (!local->ops->conf_tx)
 521                 return;
 522
 523         local->wmm_acm = 0;
 524         for (; left >= 4; left -= 4, pos += 4) {
 525                 int aci = (pos[0] >> 5) & 0x03;
 526                 int acm = (pos[0] >> 4) & 0x01;
 527                 int queue;
 528
 529                 switch (aci) {
 530                 case 1:
 531                         queue = 3;
 532                         if (acm)
 533                                 local->wmm_acm |= BIT(0) | BIT(3);
 534                         break;
 535                 case 2:
 536                         queue = 1;
 537                         if (acm)
 538                                 local->wmm_acm |= BIT(4) | BIT(5);
 539                         break;
 540                 case 3:
 541                         queue = 0;
 542                         if (acm)
 543                                 local->wmm_acm |= BIT(6) | BIT(7);
 544                         break;
 545                 case 0:
 546                 default:
 547                         queue = 2;
 548                         if (acm)
 549                                 local->wmm_acm |= BIT(1) | BIT(2);
 550                         break;
 551                 }
 552
 553                 params.aifs = pos[0] & 0x0f;
 554                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 555                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 556                 params.txop = get_unaligned_le16(pos + 2);
 557 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 558                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 559                        "cWmin=%d cWmax=%d txop=%d\n",
 560                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 561                        params.cw_max, params.txop);
 562 #endif
 563                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
 564                  * AC for now) */
 565                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 566                         printk(KERN_DEBUG "%s: failed to set TX queue "
 567                                "parameters for queue %d\n", local->mdev->name, queue);
 568                 }
 569         }
 570 }
 571
 572 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 573                                            u16 capab, bool erp_valid, u8 erp)
 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 #endif
 579         u32 changed = 0;
 580         bool use_protection;
 581         bool use_short_preamble;
 582         bool use_short_slot;
 583
 584         if (erp_valid) {
 585                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 586                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 587         } else {
 588                 use_protection = false;
 589                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 590         }
 591
 592         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 593
 594         if (use_protection != bss_conf->use_cts_prot) {
 595 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 596                 if (net_ratelimit()) {
 597                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 598                                sdata->dev->name,
 599                                use_protection ? "enabled" : "disabled",
 600                                ifsta->bssid);
 601                 }
 602 #endif
 603                 bss_conf->use_cts_prot = use_protection;
 604                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 605         }
 606
 607         if (use_short_preamble != bss_conf->use_short_preamble) {
 608 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 609                 if (net_ratelimit()) {
 610                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 611                                " (BSSID=%pM)\n",
 612                                sdata->dev->name,
 613                                use_short_preamble ? "short" : "long",
 614                                ifsta->bssid);
 615                 }
 616 #endif
 617                 bss_conf->use_short_preamble = use_short_preamble;
 618                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 619         }
 620
 621         if (use_short_slot != bss_conf->use_short_slot) {
 622 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 623                 if (net_ratelimit()) {
 624                         printk(KERN_DEBUG "%s: switched to %s slot"
 625                                " (BSSID=%s)\n",
 626                                sdata->dev->name,
 627                                use_short_slot ? "short" : "long",
 628                                ifsta->bssid);
 629                 }
 630 #endif
 631                 bss_conf->use_short_slot = use_short_slot;
 632                 changed |= BSS_CHANGED_ERP_SLOT;
 633         }
 634
 635         return changed;
 636 }
 637
 638 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
 639                                         struct ieee80211_if_sta *ifsta)
 640 {
 641         union iwreq_data wrqu;
 642         memset(&wrqu, 0, sizeof(wrqu));
 643         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
 644                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
 645         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 646         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 647 }
 648
 649 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
 650                                          struct ieee80211_if_sta *ifsta)
 651 {
 652         char *buf;
 653         size_t len;
 654         int i;
 655         union iwreq_data wrqu;
 656
 657         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
 658                 return;
 659
 660         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
 661                                 ifsta->assocresp_ies_len), GFP_KERNEL);
 662         if (!buf)
 663                 return;
 664
 665         len = sprintf(buf, "ASSOCINFO(");
 666         if (ifsta->assocreq_ies) {
 667                 len += sprintf(buf + len, "ReqIEs=");
 668                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
 669                         len += sprintf(buf + len, "%02x",
 670                                        ifsta->assocreq_ies[i]);
 671                 }
 672         }
 673         if (ifsta->assocresp_ies) {
 674                 if (ifsta->assocreq_ies)
 675                         len += sprintf(buf + len, " ");
 676                 len += sprintf(buf + len, "RespIEs=");
 677                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 678                         len += sprintf(buf + len, "%02x",
 679                                        ifsta->assocresp_ies[i]);
 680                 }
 681         }
 682         len += sprintf(buf + len, ")");
 683
 684         if (len > IW_CUSTOM_MAX) {
 685                 len = sprintf(buf, "ASSOCRESPIE=");
 686                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 687                         len += sprintf(buf + len, "%02x",
 688                                        ifsta->assocresp_ies[i]);
 689                 }
 690         }
 691
 692         if (len <= IW_CUSTOM_MAX) {
 693                 memset(&wrqu, 0, sizeof(wrqu));
 694                 wrqu.data.length = len;
 695                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 696         }
 697
 698         kfree(buf);
 699 }
 700
 701
 702 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 703                                      struct ieee80211_if_sta *ifsta)
 704 {
 705         struct ieee80211_local *local = sdata->local;
 706         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 707         u32 changed = BSS_CHANGED_ASSOC;
 708
 709         struct ieee80211_bss *bss;
 710
 711         ifsta->flags |= IEEE80211_STA_ASSOCIATED;
 712
 713         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 714                 return;
 715
 716         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 717                                    conf->channel->center_freq,
 718                                    ifsta->ssid, ifsta->ssid_len);
 719         if (bss) {
 720                 /* set timing information */
 721                 sdata->bss_conf.beacon_int = bss->beacon_int;
 722                 sdata->bss_conf.timestamp = bss->timestamp;
 723                 sdata->bss_conf.dtim_period = bss->dtim_period;
 724
 725                 changed |= ieee80211_handle_bss_capability(sdata,
 726                         bss->capability, bss->has_erp_value, bss->erp_value);
 727
 728                 ieee80211_rx_bss_put(local, bss);
 729         }
 730
 731         if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
 732                 changed |= BSS_CHANGED_HT;
 733                 sdata->bss_conf.assoc_ht = 1;
 734                 sdata->bss_conf.ht_cap = &conf->ht_cap;
 735                 sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf;
 736         }
 737
 738         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
 739         memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 740         ieee80211_sta_send_associnfo(sdata, ifsta);
 741
 742         ifsta->last_probe = jiffies;
 743         ieee80211_led_assoc(local, 1);
 744
 745         sdata->bss_conf.assoc = 1;
 746         /*
 747          * For now just always ask the driver to update the basic rateset
 748          * when we have associated, we aren't checking whether it actually
 749          * changed or not.
 750          */
 751         changed |= BSS_CHANGED_BASIC_RATES;
 752         ieee80211_bss_info_change_notify(sdata, changed);
 753
 754         netif_tx_start_all_queues(sdata->dev);
 755         netif_carrier_on(sdata->dev);
 756
 757         ieee80211_sta_send_apinfo(sdata, ifsta);
 758 }
 759
 760 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
 761                                    struct ieee80211_if_sta *ifsta)
 762 {
 763         ifsta->direct_probe_tries++;
 764         if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 765                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 766                        sdata->dev->name, ifsta->bssid);
 767                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 768                 return;
 769         }
 770
 771         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 772                         sdata->dev->name, ifsta->bssid,
 773                         ifsta->direct_probe_tries);
 774
 775         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 776
 777         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
 778
 779         /* Direct probe is sent to broadcast address as some APs
 780          * will not answer to direct packet in unassociated state.
 781          */
 782         ieee80211_send_probe_req(sdata, NULL,
 783                                  ifsta->ssid, ifsta->ssid_len);
 784
 785         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 786 }
 787
 788
 789 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
 790                                    struct ieee80211_if_sta *ifsta)
 791 {
 792         ifsta->auth_tries++;
 793         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 794                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 795                        " timed out\n",
 796                        sdata->dev->name, ifsta->bssid);
 797                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 798                 return;
 799         }
 800
 801         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
 802         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 803                sdata->dev->name, ifsta->bssid);
 804
 805         ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
 806
 807         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 808 }
 809
 810 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 811                                    struct ieee80211_if_sta *ifsta, bool deauth,
 812                                    bool self_disconnected, u16 reason)
 813 {
 814         struct ieee80211_local *local = sdata->local;
 815         struct sta_info *sta;
 816         u32 changed = BSS_CHANGED_ASSOC;
 817
 818         rcu_read_lock();
 819
 820         sta = sta_info_get(local, ifsta->bssid);
 821         if (!sta) {
 822                 rcu_read_unlock();
 823                 return;
 824         }
 825
 826         if (deauth) {
 827                 ifsta->direct_probe_tries = 0;
 828                 ifsta->auth_tries = 0;
 829         }
 830         ifsta->assoc_scan_tries = 0;
 831         ifsta->assoc_tries = 0;
 832
 833         netif_tx_stop_all_queues(sdata->dev);
 834         netif_carrier_off(sdata->dev);
 835
 836         ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
 837
 838         if (self_disconnected) {
 839                 if (deauth)
 840                         ieee80211_send_deauth_disassoc(sdata,
 841                                 IEEE80211_STYPE_DEAUTH, reason);
 842                 else
 843                         ieee80211_send_deauth_disassoc(sdata,
 844                                 IEEE80211_STYPE_DISASSOC, reason);
 845         }
 846
 847         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
 848         changed |= ieee80211_reset_erp_info(sdata);
 849
 850         if (sdata->bss_conf.assoc_ht)
 851                 changed |= BSS_CHANGED_HT;
 852
 853         sdata->bss_conf.assoc_ht = 0;
 854         sdata->bss_conf.ht_cap = NULL;
 855         sdata->bss_conf.ht_bss_conf = NULL;
 856
 857         ieee80211_led_assoc(local, 0);
 858         sdata->bss_conf.assoc = 0;
 859
 860         ieee80211_sta_send_apinfo(sdata, ifsta);
 861
 862         if (self_disconnected)
 863                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 864
 865         sta_info_unlink(&sta);
 866
 867         rcu_read_unlock();
 868
 869         sta_info_destroy(sta);
 870 }
 871
 872 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
 873 {
 874         if (!sdata || !sdata->default_key ||
 875             sdata->default_key->conf.alg != ALG_WEP)
 876                 return 0;
 877         return 1;
 878 }
 879
 880 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
 881                                       struct ieee80211_if_sta *ifsta)
 882 {
 883         struct ieee80211_local *local = sdata->local;
 884         struct ieee80211_bss *bss;
 885         int bss_privacy;
 886         int wep_privacy;
 887         int privacy_invoked;
 888
 889         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
 890                 return 0;
 891
 892         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 893                                    local->hw.conf.channel->center_freq,
 894                                    ifsta->ssid, ifsta->ssid_len);
 895         if (!bss)
 896                 return 0;
 897
 898         bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
 899         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
 900         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
 901
 902         ieee80211_rx_bss_put(local, bss);
 903
 904         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
 905                 return 0;
 906
 907         return 1;
 908 }
 909
 910 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
 911                                 struct ieee80211_if_sta *ifsta)
 912 {
 913         ifsta->assoc_tries++;
 914         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 915                 printk(KERN_DEBUG "%s: association with AP %pM"
 916                        " timed out\n",
 917                        sdata->dev->name, ifsta->bssid);
 918                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 919                 return;
 920         }
 921
 922         ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
 923         printk(KERN_DEBUG "%s: associate with AP %pM\n",
 924                sdata->dev->name, ifsta->bssid);
 925         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
 926                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 927                        "mixed-cell disabled - abort association\n", sdata->dev->name);
 928                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 929                 return;
 930         }
 931
 932         ieee80211_send_assoc(sdata, ifsta);
 933
 934         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 935 }
 936
 937
 938 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
 939                                  struct ieee80211_if_sta *ifsta)
 940 {
 941         struct ieee80211_local *local = sdata->local;
 942         struct sta_info *sta;
 943         int disassoc;
 944
 945         /* TODO: start monitoring current AP signal quality and number of
 946          * missed beacons. Scan other channels every now and then and search
 947          * for better APs. */
 948         /* TODO: remove expired BSSes */
 949
 950         ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
 951
 952         rcu_read_lock();
 953
 954         sta = sta_info_get(local, ifsta->bssid);
 955         if (!sta) {
 956                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
 957                        sdata->dev->name, ifsta->bssid);
 958                 disassoc = 1;
 959         } else {
 960                 disassoc = 0;
 961                 if (time_after(jiffies,
 962                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 963                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
 964                                 printk(KERN_DEBUG "%s: No ProbeResp from "
 965                                        "current AP %pM - assume out of "
 966                                        "range\n",
 967                                        sdata->dev->name, ifsta->bssid);
 968                                 disassoc = 1;
 969                         } else
 970                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
 971                                                          ifsta->ssid,
 972                                                          ifsta->ssid_len);
 973                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
 974                 } else {
 975                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
 976                         if (time_after(jiffies, ifsta->last_probe +
 977                                        IEEE80211_PROBE_INTERVAL)) {
 978                                 ifsta->last_probe = jiffies;
 979                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
 980                                                          ifsta->ssid,
 981                                                          ifsta->ssid_len);
 982                         }
 983                 }
 984         }
 985
 986         rcu_read_unlock();
 987
 988         if (disassoc)
 989                 ieee80211_set_disassoc(sdata, ifsta, true, true,
 990                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
 991         else
 992                 mod_timer(&ifsta->timer, jiffies +
 993                                       IEEE80211_MONITORING_INTERVAL);
 994 }
 995
 996
 997 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
 998                                      struct ieee80211_if_sta *ifsta)
 999 {
1000         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1001         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1002         ieee80211_associate(sdata, ifsta);
1003 }
1004
1005
1006 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1007                                      struct ieee80211_if_sta *ifsta,
1008                                      struct ieee80211_mgmt *mgmt,
1009                                      size_t len)
1010 {
1011         u8 *pos;
1012         struct ieee802_11_elems elems;
1013
1014         pos = mgmt->u.auth.variable;
1015         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1016         if (!elems.challenge)
1017                 return;
1018         ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1019                             elems.challenge_len + 2, 1);
1020 }
1021
1022 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1023                                    struct ieee80211_if_sta *ifsta,
1024                                    struct ieee80211_mgmt *mgmt,
1025                                    size_t len)
1026 {
1027         u16 auth_alg, auth_transaction, status_code;
1028
1029         if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1030             sdata->vif.type != NL80211_IFTYPE_ADHOC)
1031                 return;
1032
1033         if (len < 24 + 6)
1034                 return;
1035
1036         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1037             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1038                 return;
1039
1040         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1041             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1042                 return;
1043
1044         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1045         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1046         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1047
1048         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1049                 /*
1050                  * IEEE 802.11 standard does not require authentication in IBSS
1051                  * networks and most implementations do not seem to use it.
1052                  * However, try to reply to authentication attempts if someone
1053                  * has actually implemented this.
1054                  */
1055                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1056                         return;
1057                 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1058         }
1059
1060         if (auth_alg != ifsta->auth_alg ||
1061             auth_transaction != ifsta->auth_transaction)
1062                 return;
1063
1064         if (status_code != WLAN_STATUS_SUCCESS) {
1065                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1066                         u8 algs[3];
1067                         const int num_algs = ARRAY_SIZE(algs);
1068                         int i, pos;
1069                         algs[0] = algs[1] = algs[2] = 0xff;
1070                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1071                                 algs[0] = WLAN_AUTH_OPEN;
1072                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1073                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1074                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1075                                 algs[2] = WLAN_AUTH_LEAP;
1076                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1077                                 pos = 0;
1078                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1079                                 pos = 1;
1080                         else
1081                                 pos = 2;
1082                         for (i = 0; i < num_algs; i++) {
1083                                 pos++;
1084                                 if (pos >= num_algs)
1085                                         pos = 0;
1086                                 if (algs[pos] == ifsta->auth_alg ||
1087                                     algs[pos] == 0xff)
1088                                         continue;
1089                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1090                                     !ieee80211_sta_wep_configured(sdata))
1091                                         continue;
1092                                 ifsta->auth_alg = algs[pos];
1093                                 break;
1094                         }
1095                 }
1096                 return;
1097         }
1098
1099         switch (ifsta->auth_alg) {
1100         case WLAN_AUTH_OPEN:
1101         case WLAN_AUTH_LEAP:
1102                 ieee80211_auth_completed(sdata, ifsta);
1103                 break;
1104         case WLAN_AUTH_SHARED_KEY:
1105                 if (ifsta->auth_transaction == 4)
1106                         ieee80211_auth_completed(sdata, ifsta);
1107                 else
1108                         ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1109                 break;
1110         }
1111 }
1112
1113
1114 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1115                                      struct ieee80211_if_sta *ifsta,
1116                                      struct ieee80211_mgmt *mgmt,
1117                                      size_t len)
1118 {
1119         u16 reason_code;
1120
1121         if (len < 24 + 2)
1122                 return;
1123
1124         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1125                 return;
1126
1127         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1128
1129         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1130                 printk(KERN_DEBUG "%s: deauthenticated\n", sdata->dev->name);
1131
1132         if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1133             ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1134             ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1135                 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1136                 mod_timer(&ifsta->timer, jiffies +
1137                                       IEEE80211_RETRY_AUTH_INTERVAL);
1138         }
1139
1140         ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1141         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1142 }
1143
1144
1145 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1146                                        struct ieee80211_if_sta *ifsta,
1147                                        struct ieee80211_mgmt *mgmt,
1148                                        size_t len)
1149 {
1150         u16 reason_code;
1151
1152         if (len < 24 + 2)
1153                 return;
1154
1155         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1156                 return;
1157
1158         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1159
1160         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1161                 printk(KERN_DEBUG "%s: disassociated\n", sdata->dev->name);
1162
1163         if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1164                 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1165                 mod_timer(&ifsta->timer, jiffies +
1166                                       IEEE80211_RETRY_AUTH_INTERVAL);
1167         }
1168
1169         ieee80211_set_disassoc(sdata, ifsta, false, false, 0);
1170 }
1171
1172
1173 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1174                                          struct ieee80211_if_sta *ifsta,
1175                                          struct ieee80211_mgmt *mgmt,
1176                                          size_t len,
1177                                          int reassoc)
1178 {
1179         struct ieee80211_local *local = sdata->local;
1180         struct ieee80211_supported_band *sband;
1181         struct sta_info *sta;
1182         u64 rates, basic_rates;
1183         u16 capab_info, status_code, aid;
1184         struct ieee802_11_elems elems;
1185         struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
1186         u8 *pos;
1187         int i, j;
1188         bool have_higher_than_11mbit = false;
1189
1190         /* AssocResp and ReassocResp have identical structure, so process both
1191          * of them in this function. */
1192
1193         if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1194                 return;
1195
1196         if (len < 24 + 6)
1197                 return;
1198
1199         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1200                 return;
1201
1202         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1203         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1204         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1205
1206         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1207                "status=%d aid=%d)\n",
1208                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1209                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1210
1211         if (status_code != WLAN_STATUS_SUCCESS) {
1212                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1213                        sdata->dev->name, status_code);
1214                 /* if this was a reassociation, ensure we try a "full"
1215                  * association next time. This works around some broken APs
1216                  * which do not correctly reject reassociation requests. */
1217                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1218                 return;
1219         }
1220
1221         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1222                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1223                        "set\n", sdata->dev->name, aid);
1224         aid &= ~(BIT(15) | BIT(14));
1225
1226         pos = mgmt->u.assoc_resp.variable;
1227         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1228
1229         if (!elems.supp_rates) {
1230                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1231                        sdata->dev->name);
1232                 return;
1233         }
1234
1235         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1236         ifsta->aid = aid;
1237         ifsta->ap_capab = capab_info;
1238
1239         kfree(ifsta->assocresp_ies);
1240         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1241         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1242         if (ifsta->assocresp_ies)
1243                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1244
1245         rcu_read_lock();
1246
1247         /* Add STA entry for the AP */
1248         sta = sta_info_get(local, ifsta->bssid);
1249         if (!sta) {
1250                 struct ieee80211_bss *bss;
1251                 int err;
1252
1253                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1254                 if (!sta) {
1255                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1256                                " the AP\n", sdata->dev->name);
1257                         rcu_read_unlock();
1258                         return;
1259                 }
1260                 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1261                                            local->hw.conf.channel->center_freq,
1262                                            ifsta->ssid, ifsta->ssid_len);
1263                 if (bss) {
1264                         sta->last_signal = bss->signal;
1265                         sta->last_qual = bss->qual;
1266                         sta->last_noise = bss->noise;
1267                         ieee80211_rx_bss_put(local, bss);
1268                 }
1269
1270                 err = sta_info_insert(sta);
1271                 if (err) {
1272                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1273                                " the AP (error %d)\n", sdata->dev->name, err);
1274                         rcu_read_unlock();
1275                         return;
1276                 }
1277                 /* update new sta with its last rx activity */
1278                 sta->last_rx = jiffies;
1279         }
1280
1281         /*
1282          * FIXME: Do we really need to update the sta_info's information here?
1283          *        We already know about the AP (we found it in our list) so it
1284          *        should already be filled with the right info, no?
1285          *        As is stands, all this is racy because typically we assume
1286          *        the information that is filled in here (except flags) doesn't
1287          *        change while a STA structure is alive. As such, it should move
1288          *        to between the sta_info_alloc() and sta_info_insert() above.
1289          */
1290
1291         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1292                            WLAN_STA_AUTHORIZED);
1293
1294         rates = 0;
1295         basic_rates = 0;
1296         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1297
1298         for (i = 0; i < elems.supp_rates_len; i++) {
1299                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1300
1301                 if (rate > 110)
1302                         have_higher_than_11mbit = true;
1303
1304                 for (j = 0; j < sband->n_bitrates; j++) {
1305                         if (sband->bitrates[j].bitrate == rate)
1306                                 rates |= BIT(j);
1307                         if (elems.supp_rates[i] & 0x80)
1308                                 basic_rates |= BIT(j);
1309                 }
1310         }
1311
1312         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1313                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1314
1315                 if (rate > 110)
1316                         have_higher_than_11mbit = true;
1317
1318                 for (j = 0; j < sband->n_bitrates; j++) {
1319                         if (sband->bitrates[j].bitrate == rate)
1320                                 rates |= BIT(j);
1321                         if (elems.ext_supp_rates[i] & 0x80)
1322                                 basic_rates |= BIT(j);
1323                 }
1324         }
1325
1326         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1327         sdata->bss_conf.basic_rates = basic_rates;
1328
1329         /* cf. IEEE 802.11 9.2.12 */
1330         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1331             have_higher_than_11mbit)
1332                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1333         else
1334                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1335
1336         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1337             (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
1338                 struct ieee80211_ht_bss_info bss_info;
1339                 ieee80211_ht_cap_ie_to_sta_ht_cap(
1340                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1341                 ieee80211_ht_info_ie_to_ht_bss_info(
1342                                 elems.ht_info_elem, &bss_info);
1343                 ieee80211_handle_ht(local, &sta->sta.ht_cap, &bss_info);
1344         }
1345
1346         rate_control_rate_init(sta);
1347
1348         if (elems.wmm_param) {
1349                 set_sta_flags(sta, WLAN_STA_WME);
1350                 rcu_read_unlock();
1351                 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1352                                          elems.wmm_param_len);
1353         } else
1354                 rcu_read_unlock();
1355
1356         /* set AID and assoc capability,
1357          * ieee80211_set_associated() will tell the driver */
1358         bss_conf->aid = aid;
1359         bss_conf->assoc_capability = capab_info;
1360         ieee80211_set_associated(sdata, ifsta);
1361
1362         ieee80211_associated(sdata, ifsta);
1363 }
1364
1365
1366 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1367                                    struct ieee80211_if_sta *ifsta,
1368                                    struct ieee80211_bss *bss)
1369 {
1370         struct ieee80211_local *local = sdata->local;
1371         int res, rates, i, j;
1372         struct sk_buff *skb;
1373         struct ieee80211_mgmt *mgmt;
1374         u8 *pos;
1375         struct ieee80211_supported_band *sband;
1376         union iwreq_data wrqu;
1377
1378         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1379
1380         /* Remove possible STA entries from other IBSS networks. */
1381         sta_info_flush_delayed(sdata);
1382
1383         if (local->ops->reset_tsf) {
1384                 /* Reset own TSF to allow time synchronization work. */
1385                 local->ops->reset_tsf(local_to_hw(local));
1386         }
1387         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1388         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1389         if (res)
1390                 return res;
1391
1392         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1393
1394         sdata->drop_unencrypted = bss->capability &
1395                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1396
1397         res = ieee80211_set_freq(sdata, bss->freq);
1398
1399         if (res)
1400                 return res;
1401
1402         /* Build IBSS probe response */
1403         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
1404         if (skb) {
1405                 skb_reserve(skb, local->hw.extra_tx_headroom);
1406
1407                 mgmt = (struct ieee80211_mgmt *)
1408                         skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1409                 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1410                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1411                                                   IEEE80211_STYPE_PROBE_RESP);
1412                 memset(mgmt->da, 0xff, ETH_ALEN);
1413                 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1414                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1415                 mgmt->u.beacon.beacon_int =
1416                         cpu_to_le16(local->hw.conf.beacon_int);
1417                 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1418                 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1419
1420                 pos = skb_put(skb, 2 + ifsta->ssid_len);
1421                 *pos++ = WLAN_EID_SSID;
1422                 *pos++ = ifsta->ssid_len;
1423                 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1424
1425                 rates = bss->supp_rates_len;
1426                 if (rates > 8)
1427                         rates = 8;
1428                 pos = skb_put(skb, 2 + rates);
1429                 *pos++ = WLAN_EID_SUPP_RATES;
1430                 *pos++ = rates;
1431                 memcpy(pos, bss->supp_rates, rates);
1432
1433                 if (bss->band == IEEE80211_BAND_2GHZ) {
1434                         pos = skb_put(skb, 2 + 1);
1435                         *pos++ = WLAN_EID_DS_PARAMS;
1436                         *pos++ = 1;
1437                         *pos++ = ieee80211_frequency_to_channel(bss->freq);
1438                 }
1439
1440                 pos = skb_put(skb, 2 + 2);
1441                 *pos++ = WLAN_EID_IBSS_PARAMS;
1442                 *pos++ = 2;
1443                 /* FIX: set ATIM window based on scan results */
1444                 *pos++ = 0;
1445                 *pos++ = 0;
1446
1447                 if (bss->supp_rates_len > 8) {
1448                         rates = bss->supp_rates_len - 8;
1449                         pos = skb_put(skb, 2 + rates);
1450                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
1451                         *pos++ = rates;
1452                         memcpy(pos, &bss->supp_rates[8], rates);
1453                 }
1454
1455                 ifsta->probe_resp = skb;
1456
1457                 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1458         }
1459
1460         rates = 0;
1461         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1462         for (i = 0; i < bss->supp_rates_len; i++) {
1463                 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1464                 for (j = 0; j < sband->n_bitrates; j++)
1465                         if (sband->bitrates[j].bitrate == bitrate)
1466                                 rates |= BIT(j);
1467         }
1468         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1469
1470         ieee80211_sta_def_wmm_params(sdata, bss);
1471
1472         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1473         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1474
1475         ieee80211_led_assoc(local, true);
1476
1477         memset(&wrqu, 0, sizeof(wrqu));
1478         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1479         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1480
1481         return res;
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
1500         if (elems->ds_params && elems->ds_params_len == 1)
1501                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1502         else
1503                 freq = rx_status->freq;
1504
1505         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1506
1507         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1508                 return;
1509
1510         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1511             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1512                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1513
1514                 rcu_read_lock();
1515
1516                 sta = sta_info_get(local, mgmt->sa);
1517                 if (sta) {
1518                         u64 prev_rates;
1519
1520                         prev_rates = sta->sta.supp_rates[band];
1521                         /* make sure mandatory rates are always added */
1522                         sta->sta.supp_rates[band] = supp_rates |
1523                                 ieee80211_mandatory_rates(local, band);
1524
1525 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1526                         if (sta->sta.supp_rates[band] != prev_rates)
1527                                 printk(KERN_DEBUG "%s: updated supp_rates set "
1528                                     "for %pM based on beacon info (0x%llx | "
1529                                     "0x%llx -> 0x%llx)\n",
1530                                     sdata->dev->name,
1531                                     sta->sta.addr,
1532                                     (unsigned long long) prev_rates,
1533                                     (unsigned long long) supp_rates,
1534                                     (unsigned long long) sta->sta.supp_rates[band]);
1535 #endif
1536                 } else {
1537                         ieee80211_ibss_add_sta(sdata, NULL, mgmt->bssid,
1538                                                mgmt->sa, supp_rates);
1539                 }
1540
1541                 rcu_read_unlock();
1542         }
1543
1544         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1545                                         freq, beacon);
1546         if (!bss)
1547                 return;
1548
1549         /* was just updated in ieee80211_bss_info_update */
1550         beacon_timestamp = bss->timestamp;
1551
1552         /*
1553          * In STA mode, the remaining parameters should not be overridden
1554          * by beacons because they're not necessarily accurate there.
1555          */
1556         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1557             bss->last_probe_resp && beacon) {
1558                 ieee80211_rx_bss_put(local, bss);
1559                 return;
1560         }
1561
1562         /* check if we need to merge IBSS */
1563         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1564             bss->capability & WLAN_CAPABILITY_IBSS &&
1565             bss->freq == local->oper_channel->center_freq &&
1566             elems->ssid_len == sdata->u.sta.ssid_len &&
1567             memcmp(elems->ssid, sdata->u.sta.ssid,
1568                                 sdata->u.sta.ssid_len) == 0) {
1569                 if (rx_status->flag & RX_FLAG_TSFT) {
1570                         /* in order for correct IBSS merging we need mactime
1571                          *
1572                          * since mactime is defined as the time the first data
1573                          * symbol of the frame hits the PHY, and the timestamp
1574                          * of the beacon is defined as "the time that the data
1575                          * symbol containing the first bit of the timestamp is
1576                          * transmitted to the PHY plus the transmitting STA’s
1577                          * delays through its local PHY from the MAC-PHY
1578                          * interface to its interface with the WM"
1579                          * (802.11 11.1.2) - equals the time this bit arrives at
1580                          * the receiver - we have to take into account the
1581                          * offset between the two.
1582                          * e.g: at 1 MBit that means mactime is 192 usec earlier
1583                          * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1584                          */
1585                         int rate = local->hw.wiphy->bands[band]->
1586                                         bitrates[rx_status->rate_idx].bitrate;
1587                         rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1588                 } else if (local && local->ops && local->ops->get_tsf)
1589                         /* second best option: get current TSF */
1590                         rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1591                 else
1592                         /* can't merge without knowing the TSF */
1593                         rx_timestamp = -1LLU;
1594 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1595                 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1596                        "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1597                        mgmt->sa, mgmt->bssid,
1598                        (unsigned long long)rx_timestamp,
1599                        (unsigned long long)beacon_timestamp,
1600                        (unsigned long long)(rx_timestamp - beacon_timestamp),
1601                        jiffies);
1602 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1603                 if (beacon_timestamp > rx_timestamp) {
1604 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1605                         printk(KERN_DEBUG "%s: beacon TSF higher than "
1606                                "local TSF - IBSS merge with BSSID %pM\n",
1607                                sdata->dev->name, mgmt->bssid);
1608 #endif
1609                         ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1610                         ieee80211_ibss_add_sta(sdata, NULL,
1611                                                mgmt->bssid, mgmt->sa,
1612                                                supp_rates);
1613                 }
1614         }
1615
1616         ieee80211_rx_bss_put(local, bss);
1617 }
1618
1619
1620 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1621                                          struct ieee80211_mgmt *mgmt,
1622                                          size_t len,
1623                                          struct ieee80211_rx_status *rx_status)
1624 {
1625         size_t baselen;
1626         struct ieee802_11_elems elems;
1627         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1628
1629         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1630                 return; /* ignore ProbeResp to foreign address */
1631
1632         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1633         if (baselen > len)
1634                 return;
1635
1636         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1637                                 &elems);
1638
1639         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1640
1641         /* direct probe may be part of the association flow */
1642         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1643                                                         &ifsta->request)) {
1644                 printk(KERN_DEBUG "%s direct probe responded\n",
1645                        sdata->dev->name);
1646                 ieee80211_authenticate(sdata, ifsta);
1647         }
1648 }
1649
1650
1651 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1652                                      struct ieee80211_mgmt *mgmt,
1653                                      size_t len,
1654                                      struct ieee80211_rx_status *rx_status)
1655 {
1656         struct ieee80211_if_sta *ifsta;
1657         size_t baselen;
1658         struct ieee802_11_elems elems;
1659         struct ieee80211_local *local = sdata->local;
1660         struct ieee80211_conf *conf = &local->hw.conf;
1661         u32 changed = 0;
1662         bool erp_valid;
1663         u8 erp_value = 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 != NL80211_IFTYPE_STATION)
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
1686         if (elems.erp_info && elems.erp_info_len >= 1) {
1687                 erp_valid = true;
1688                 erp_value = elems.erp_info[0];
1689         } else {
1690                 erp_valid = false;
1691         }
1692         changed |= ieee80211_handle_bss_capability(sdata,
1693                         le16_to_cpu(mgmt->u.beacon.capab_info),
1694                         erp_valid, erp_value);
1695
1696         if (elems.ht_cap_elem && elems.ht_info_elem &&
1697             elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
1698                 struct ieee80211_ht_bss_info bss_info;
1699
1700                 ieee80211_ht_info_ie_to_ht_bss_info(
1701                                 elems.ht_info_elem, &bss_info);
1702                 changed |= ieee80211_handle_ht(local, &conf->ht_cap,
1703                                                &bss_info);
1704         }
1705
1706         ieee80211_bss_info_change_notify(sdata, changed);
1707 }
1708
1709
1710 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1711                                         struct ieee80211_if_sta *ifsta,
1712                                         struct ieee80211_mgmt *mgmt,
1713                                         size_t len,
1714                                         struct ieee80211_rx_status *rx_status)
1715 {
1716         struct ieee80211_local *local = sdata->local;
1717         int tx_last_beacon;
1718         struct sk_buff *skb;
1719         struct ieee80211_mgmt *resp;
1720         u8 *pos, *end;
1721
1722         if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1723             ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1724             len < 24 + 2 || !ifsta->probe_resp)
1725                 return;
1726
1727         if (local->ops->tx_last_beacon)
1728                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1729         else
1730                 tx_last_beacon = 1;
1731
1732 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1733         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1734                " (tx_last_beacon=%d)\n",
1735                sdata->dev->name, mgmt->sa, mgmt->da,
1736                mgmt->bssid, tx_last_beacon);
1737 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1738
1739         if (!tx_last_beacon)
1740                 return;
1741
1742         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1743             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1744                 return;
1745
1746         end = ((u8 *) mgmt) + len;
1747         pos = mgmt->u.probe_req.variable;
1748         if (pos[0] != WLAN_EID_SSID ||
1749             pos + 2 + pos[1] > end) {
1750 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1751                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1752                        "from %pM\n",
1753                        sdata->dev->name, mgmt->sa);
1754 #endif
1755                 return;
1756         }
1757         if (pos[1] != 0 &&
1758             (pos[1] != ifsta->ssid_len ||
1759              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1760                 /* Ignore ProbeReq for foreign SSID */
1761                 return;
1762         }
1763
1764         /* Reply with ProbeResp */
1765         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1766         if (!skb)
1767                 return;
1768
1769         resp = (struct ieee80211_mgmt *) skb->data;
1770         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1771 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1772         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1773                sdata->dev->name, resp->da);
1774 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1775         ieee80211_tx_skb(sdata, skb, 0);
1776 }
1777
1778 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1779                            struct ieee80211_rx_status *rx_status)
1780 {
1781         struct ieee80211_local *local = sdata->local;
1782         struct ieee80211_if_sta *ifsta;
1783         struct ieee80211_mgmt *mgmt;
1784         u16 fc;
1785
1786         if (skb->len < 24)
1787                 goto fail;
1788
1789         ifsta = &sdata->u.sta;
1790
1791         mgmt = (struct ieee80211_mgmt *) skb->data;
1792         fc = le16_to_cpu(mgmt->frame_control);
1793
1794         switch (fc & IEEE80211_FCTL_STYPE) {
1795         case IEEE80211_STYPE_PROBE_REQ:
1796         case IEEE80211_STYPE_PROBE_RESP:
1797         case IEEE80211_STYPE_BEACON:
1798                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1799         case IEEE80211_STYPE_AUTH:
1800         case IEEE80211_STYPE_ASSOC_RESP:
1801         case IEEE80211_STYPE_REASSOC_RESP:
1802         case IEEE80211_STYPE_DEAUTH:
1803         case IEEE80211_STYPE_DISASSOC:
1804                 skb_queue_tail(&ifsta->skb_queue, skb);
1805                 queue_work(local->hw.workqueue, &ifsta->work);
1806                 return;
1807         }
1808
1809  fail:
1810         kfree_skb(skb);
1811 }
1812
1813 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1814                                          struct sk_buff *skb)
1815 {
1816         struct ieee80211_rx_status *rx_status;
1817         struct ieee80211_if_sta *ifsta;
1818         struct ieee80211_mgmt *mgmt;
1819         u16 fc;
1820
1821         ifsta = &sdata->u.sta;
1822
1823         rx_status = (struct ieee80211_rx_status *) skb->cb;
1824         mgmt = (struct ieee80211_mgmt *) skb->data;
1825         fc = le16_to_cpu(mgmt->frame_control);
1826
1827         switch (fc & IEEE80211_FCTL_STYPE) {
1828         case IEEE80211_STYPE_PROBE_REQ:
1829                 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
1830                                             rx_status);
1831                 break;
1832         case IEEE80211_STYPE_PROBE_RESP:
1833                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1834                 break;
1835         case IEEE80211_STYPE_BEACON:
1836                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1837                 break;
1838         case IEEE80211_STYPE_AUTH:
1839                 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1840                 break;
1841         case IEEE80211_STYPE_ASSOC_RESP:
1842                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1843                 break;
1844         case IEEE80211_STYPE_REASSOC_RESP:
1845                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
1846                 break;
1847         case IEEE80211_STYPE_DEAUTH:
1848                 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
1849                 break;
1850         case IEEE80211_STYPE_DISASSOC:
1851                 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
1852                 break;
1853         }
1854
1855         kfree_skb(skb);
1856 }
1857
1858
1859 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
1860 {
1861         struct ieee80211_local *local = sdata->local;
1862         int active = 0;
1863         struct sta_info *sta;
1864
1865         rcu_read_lock();
1866
1867         list_for_each_entry_rcu(sta, &local->sta_list, list) {
1868                 if (sta->sdata == sdata &&
1869                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1870                                jiffies)) {
1871                         active++;
1872                         break;
1873                 }
1874         }
1875
1876         rcu_read_unlock();
1877
1878         return active;
1879 }
1880
1881
1882 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
1883                                      struct ieee80211_if_sta *ifsta)
1884 {
1885         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1886
1887         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
1888         if (ieee80211_sta_active_ibss(sdata))
1889                 return;
1890
1891         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1892                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
1893         ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
1894 }
1895
1896
1897 static void ieee80211_sta_timer(unsigned long data)
1898 {
1899         struct ieee80211_sub_if_data *sdata =
1900                 (struct ieee80211_sub_if_data *) data;
1901         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1902         struct ieee80211_local *local = sdata->local;
1903
1904         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1905         queue_work(local->hw.workqueue, &ifsta->work);
1906 }
1907
1908 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
1909                                      struct ieee80211_if_sta *ifsta)
1910 {
1911         struct ieee80211_local *local = sdata->local;
1912
1913         if (local->ops->reset_tsf) {
1914                 /* Reset own TSF to allow time synchronization work. */
1915                 local->ops->reset_tsf(local_to_hw(local));
1916         }
1917
1918         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
1919
1920
1921         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1922                 ifsta->auth_alg = WLAN_AUTH_OPEN;
1923         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1924                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
1925         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1926                 ifsta->auth_alg = WLAN_AUTH_LEAP;
1927         else
1928                 ifsta->auth_alg = WLAN_AUTH_OPEN;
1929         ifsta->auth_transaction = -1;
1930         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
1931         ifsta->assoc_scan_tries = 0;
1932         ifsta->direct_probe_tries = 0;
1933         ifsta->auth_tries = 0;
1934         ifsta->assoc_tries = 0;
1935         netif_tx_stop_all_queues(sdata->dev);
1936         netif_carrier_off(sdata->dev);
1937 }
1938
1939
1940 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
1941                                     const char *ssid, int ssid_len)
1942 {
1943         int tmp, hidden_ssid;
1944
1945         if (ssid_len == ifsta->ssid_len &&
1946             !memcmp(ifsta->ssid, ssid, ssid_len))
1947                 return 1;
1948
1949         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1950                 return 0;
1951
1952         hidden_ssid = 1;
1953         tmp = ssid_len;
1954         while (tmp--) {
1955                 if (ssid[tmp] != '\0') {
1956                         hidden_ssid = 0;
1957                         break;
1958                 }
1959         }
1960
1961         if (hidden_ssid && ifsta->ssid_len == ssid_len)
1962                 return 1;
1963
1964         if (ssid_len == 1 && ssid[0] == ' ')
1965                 return 1;
1966
1967         return 0;
1968 }
1969
1970 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
1971                                      struct ieee80211_if_sta *ifsta)
1972 {
1973         struct ieee80211_local *local = sdata->local;
1974         struct ieee80211_bss *bss;
1975         struct ieee80211_supported_band *sband;
1976         u8 bssid[ETH_ALEN], *pos;
1977         int i;
1978         int ret;
1979
1980 #if 0
1981         /* Easier testing, use fixed BSSID. */
1982         memset(bssid, 0xfe, ETH_ALEN);
1983 #else
1984         /* Generate random, not broadcast, locally administered BSSID. Mix in
1985          * own MAC address to make sure that devices that do not have proper
1986          * random number generator get different BSSID. */
1987         get_random_bytes(bssid, ETH_ALEN);
1988         for (i = 0; i < ETH_ALEN; i++)
1989                 bssid[i] ^= sdata->dev->dev_addr[i];
1990         bssid[0] &= ~0x01;
1991         bssid[0] |= 0x02;
1992 #endif
1993
1994         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
1995                sdata->dev->name, bssid);
1996
1997         bss = ieee80211_rx_bss_add(local, bssid,
1998                                    local->hw.conf.channel->center_freq,
1999                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2000         if (!bss)
2001                 return -ENOMEM;
2002
2003         bss->band = local->hw.conf.channel->band;
2004         sband = local->hw.wiphy->bands[bss->band];
2005
2006         if (local->hw.conf.beacon_int == 0)
2007                 local->hw.conf.beacon_int = 100;
2008         bss->beacon_int = local->hw.conf.beacon_int;
2009         bss->last_update = jiffies;
2010         bss->capability = WLAN_CAPABILITY_IBSS;
2011
2012         if (sdata->default_key)
2013                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2014         else
2015                 sdata->drop_unencrypted = 0;
2016
2017         bss->supp_rates_len = sband->n_bitrates;
2018         pos = bss->supp_rates;
2019         for (i = 0; i < sband->n_bitrates; i++) {
2020                 int rate = sband->bitrates[i].bitrate;
2021                 *pos++ = (u8) (rate / 5);
2022         }
2023
2024         ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2025         ieee80211_rx_bss_put(local, bss);
2026         return ret;
2027 }
2028
2029
2030 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2031                                    struct ieee80211_if_sta *ifsta)
2032 {
2033         struct ieee80211_local *local = sdata->local;
2034         struct ieee80211_bss *bss;
2035         int found = 0;
2036         u8 bssid[ETH_ALEN];
2037         int active_ibss;
2038
2039         if (ifsta->ssid_len == 0)
2040                 return -EINVAL;
2041
2042         active_ibss = ieee80211_sta_active_ibss(sdata);
2043 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2044         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2045                sdata->dev->name, active_ibss);
2046 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2047         spin_lock_bh(&local->bss_lock);
2048         list_for_each_entry(bss, &local->bss_list, list) {
2049                 if (ifsta->ssid_len != bss->ssid_len ||
2050                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2051                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2052                         continue;
2053 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2054                 printk(KERN_DEBUG "   bssid=%pM found\n", bss->bssid);
2055 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2056                 memcpy(bssid, bss->bssid, ETH_ALEN);
2057                 found = 1;
2058                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2059                         break;
2060         }
2061         spin_unlock_bh(&local->bss_lock);
2062
2063 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2064         if (found)
2065                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
2066                        "%pM\n", bssid, ifsta->bssid);
2067 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2068
2069         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2070                 int ret;
2071                 int search_freq;
2072
2073                 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2074                         search_freq = bss->freq;
2075                 else
2076                         search_freq = local->hw.conf.channel->center_freq;
2077
2078                 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2079                                            ifsta->ssid, ifsta->ssid_len);
2080                 if (!bss)
2081                         goto dont_join;
2082
2083                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2084                        " based on configured SSID\n",
2085                        sdata->dev->name, bssid);
2086                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2087                 ieee80211_rx_bss_put(local, bss);
2088                 return ret;
2089         }
2090
2091 dont_join:
2092 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2093         printk(KERN_DEBUG "   did not try to join ibss\n");
2094 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2095
2096         /* Selected IBSS not found in current scan results - try to scan */
2097         if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2098             !ieee80211_sta_active_ibss(sdata)) {
2099                 mod_timer(&ifsta->timer, jiffies +
2100                                       IEEE80211_IBSS_MERGE_INTERVAL);
2101         } else if (time_after(jiffies, local->last_scan_completed +
2102                               IEEE80211_SCAN_INTERVAL)) {
2103                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2104                        "join\n", sdata->dev->name);
2105                 return ieee80211_request_scan(sdata, ifsta->ssid,
2106                                               ifsta->ssid_len);
2107         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2108                 int interval = IEEE80211_SCAN_INTERVAL;
2109
2110                 if (time_after(jiffies, ifsta->ibss_join_req +
2111                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2112                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2113                             (!(local->oper_channel->flags &
2114                                         IEEE80211_CHAN_NO_IBSS)))
2115                                 return ieee80211_sta_create_ibss(sdata, ifsta);
2116                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2117                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
2118                                        " %d MHz\n", sdata->dev->name,
2119                                        local->hw.conf.channel->center_freq);
2120                         }
2121
2122                         /* No IBSS found - decrease scan interval and continue
2123                          * scanning. */
2124                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2125                 }
2126
2127                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2128                 mod_timer(&ifsta->timer, jiffies + interval);
2129                 return 0;
2130         }
2131
2132         return 0;
2133 }
2134
2135
2136 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2137                                      struct ieee80211_if_sta *ifsta)
2138 {
2139         struct ieee80211_local *local = sdata->local;
2140         struct ieee80211_bss *bss, *selected = NULL;
2141         int top_rssi = 0, freq;
2142
2143         spin_lock_bh(&local->bss_lock);
2144         freq = local->oper_channel->center_freq;
2145         list_for_each_entry(bss, &local->bss_list, list) {
2146                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2147                         continue;
2148
2149                 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2150                         IEEE80211_STA_AUTO_BSSID_SEL |
2151                         IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2152                     (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2153                      !!sdata->default_key))
2154                         continue;
2155
2156                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2157                     bss->freq != freq)
2158                         continue;
2159
2160                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2161                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2162                         continue;
2163
2164                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2165                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2166                         continue;
2167
2168                 if (!selected || top_rssi < bss->signal) {
2169                         selected = bss;
2170                         top_rssi = bss->signal;
2171                 }
2172         }
2173         if (selected)
2174                 atomic_inc(&selected->users);
2175         spin_unlock_bh(&local->bss_lock);
2176
2177         if (selected) {
2178                 ieee80211_set_freq(sdata, selected->freq);
2179                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2180                         ieee80211_sta_set_ssid(sdata, selected->ssid,
2181                                                selected->ssid_len);
2182                 ieee80211_sta_set_bssid(sdata, selected->bssid);
2183                 ieee80211_sta_def_wmm_params(sdata, selected);
2184
2185                 /* Send out direct probe if no probe resp was received or
2186                  * the one we have is outdated
2187                  */
2188                 if (!selected->last_probe_resp ||
2189                     time_after(jiffies, selected->last_probe_resp
2190                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2191                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2192                 else
2193                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2194
2195                 ieee80211_rx_bss_put(local, selected);
2196                 ieee80211_sta_reset_auth(sdata, ifsta);
2197                 return 0;
2198         } else {
2199                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2200                         ifsta->assoc_scan_tries++;
2201                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2202                                 ieee80211_start_scan(sdata, NULL, 0);
2203                         else
2204                                 ieee80211_start_scan(sdata, ifsta->ssid,
2205                                                          ifsta->ssid_len);
2206                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2207                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2208                 } else
2209                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
2210         }
2211         return -1;
2212 }
2213
2214
2215 static void ieee80211_sta_work(struct work_struct *work)
2216 {
2217         struct ieee80211_sub_if_data *sdata =
2218                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2219         struct ieee80211_local *local = sdata->local;
2220         struct ieee80211_if_sta *ifsta;
2221         struct sk_buff *skb;
2222
2223         if (!netif_running(sdata->dev))
2224                 return;
2225
2226         if (local->sw_scanning || local->hw_scanning)
2227                 return;
2228
2229         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2230                     sdata->vif.type != NL80211_IFTYPE_ADHOC))
2231                 return;
2232         ifsta = &sdata->u.sta;
2233
2234         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2235                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2236
2237         if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2238             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2239             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2240             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2241                 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2242                                      ifsta->scan_ssid_len);
2243                 return;
2244         }
2245
2246         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2247                 if (ieee80211_sta_config_auth(sdata, ifsta))
2248                         return;
2249                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2250         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2251                 return;
2252
2253         switch (ifsta->state) {
2254         case IEEE80211_STA_MLME_DISABLED:
2255                 break;
2256         case IEEE80211_STA_MLME_DIRECT_PROBE:
2257                 ieee80211_direct_probe(sdata, ifsta);
2258                 break;
2259         case IEEE80211_STA_MLME_AUTHENTICATE:
2260                 ieee80211_authenticate(sdata, ifsta);
2261                 break;
2262         case IEEE80211_STA_MLME_ASSOCIATE:
2263                 ieee80211_associate(sdata, ifsta);
2264                 break;
2265         case IEEE80211_STA_MLME_ASSOCIATED:
2266                 ieee80211_associated(sdata, ifsta);
2267                 break;
2268         case IEEE80211_STA_MLME_IBSS_SEARCH:
2269                 ieee80211_sta_find_ibss(sdata, ifsta);
2270                 break;
2271         case IEEE80211_STA_MLME_IBSS_JOINED:
2272                 ieee80211_sta_merge_ibss(sdata, ifsta);
2273                 break;
2274         default:
2275                 WARN_ON(1);
2276                 break;
2277         }
2278
2279         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2280                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2281                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2282
2283                 ieee80211_set_disassoc(sdata, ifsta, false, true,
2284                                         WLAN_REASON_UNSPECIFIED);
2285         }
2286 }
2287
2288 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2289 {
2290         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2291                 queue_work(sdata->local->hw.workqueue,
2292                            &sdata->u.sta.work);
2293 }
2294
2295 /* interface setup */
2296 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2297 {
2298         struct ieee80211_if_sta *ifsta;
2299
2300         ifsta = &sdata->u.sta;
2301         INIT_WORK(&ifsta->work, ieee80211_sta_work);
2302         setup_timer(&ifsta->timer, ieee80211_sta_timer,
2303                     (unsigned long) sdata);
2304         skb_queue_head_init(&ifsta->skb_queue);
2305
2306         ifsta->capab = WLAN_CAPABILITY_ESS;
2307         ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2308                 IEEE80211_AUTH_ALG_SHARED_KEY;
2309         ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2310                 IEEE80211_STA_AUTO_BSSID_SEL |
2311                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2312         if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2313                 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2314 }
2315
2316 /*
2317  * Add a new IBSS station, will also be called by the RX code when,
2318  * in IBSS mode, receiving a frame from a yet-unknown station, hence
2319  * must be callable in atomic context.
2320  */
2321 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2322                                         struct sk_buff *skb, u8 *bssid,
2323                                         u8 *addr, u64 supp_rates)
2324 {
2325         struct ieee80211_local *local = sdata->local;
2326         struct sta_info *sta;
2327         int band = local->hw.conf.channel->band;
2328
2329         /* TODO: Could consider removing the least recently used entry and
2330          * allow new one to be added. */
2331         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2332                 if (net_ratelimit()) {
2333                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2334                                "entry %pM\n", sdata->dev->name, addr);
2335                 }
2336                 return NULL;
2337         }
2338
2339         if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2340                 return NULL;
2341
2342 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2343         printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2344                wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2345 #endif
2346
2347         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2348         if (!sta)
2349                 return NULL;
2350
2351         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2352
2353         /* make sure mandatory rates are always added */
2354         sta->sta.supp_rates[band] = supp_rates |
2355                         ieee80211_mandatory_rates(local, band);
2356
2357         rate_control_rate_init(sta);
2358
2359         if (sta_info_insert(sta))
2360                 return NULL;
2361
2362         return sta;
2363 }
2364
2365 /* configuration hooks */
2366 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2367                             struct ieee80211_if_sta *ifsta)
2368 {
2369         struct ieee80211_local *local = sdata->local;
2370
2371         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2372                 return;
2373
2374         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2375                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2376             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2377                              IEEE80211_STA_AUTO_SSID_SEL))) {
2378
2379                 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2380                         ieee80211_set_disassoc(sdata, ifsta, true, true,
2381                                                WLAN_REASON_DEAUTH_LEAVING);
2382
2383                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2384                 queue_work(local->hw.workqueue, &ifsta->work);
2385         }
2386 }
2387
2388 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2389 {
2390         struct ieee80211_if_sta *ifsta;
2391         int res;
2392
2393         if (len > IEEE80211_MAX_SSID_LEN)
2394                 return -EINVAL;
2395
2396         ifsta = &sdata->u.sta;
2397
2398         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2399                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2400                 memcpy(ifsta->ssid, ssid, len);
2401                 ifsta->ssid_len = len;
2402                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2403
2404                 res = 0;
2405                 /*
2406                  * Hack! MLME code needs to be cleaned up to have different
2407                  * entry points for configuration and internal selection change
2408                  */
2409                 if (netif_running(sdata->dev))
2410                         res = ieee80211_if_config(sdata, IEEE80211_IFCC_SSID);
2411                 if (res) {
2412                         printk(KERN_DEBUG "%s: Failed to config new SSID to "
2413                                "the low-level driver\n", sdata->dev->name);
2414                         return res;
2415                 }
2416         }
2417
2418         if (len)
2419                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2420         else
2421                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2422
2423         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2424             !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2425                 ifsta->ibss_join_req = jiffies;
2426                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2427                 return ieee80211_sta_find_ibss(sdata, ifsta);
2428         }
2429
2430         return 0;
2431 }
2432
2433 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2434 {
2435         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2436         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2437         *len = ifsta->ssid_len;
2438         return 0;
2439 }
2440
2441 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2442 {
2443         struct ieee80211_if_sta *ifsta;
2444         int res;
2445
2446         ifsta = &sdata->u.sta;
2447
2448         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2449                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2450                 res = 0;
2451                 /*
2452                  * Hack! See also ieee80211_sta_set_ssid.
2453                  */
2454                 if (netif_running(sdata->dev))
2455                         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2456                 if (res) {
2457                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2458                                "the low-level driver\n", sdata->dev->name);
2459                         return res;
2460                 }
2461         }
2462
2463         if (is_valid_ether_addr(bssid))
2464                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2465         else
2466                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2467
2468         return 0;
2469 }
2470
2471 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2472 {
2473         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2474
2475         kfree(ifsta->extra_ie);
2476         if (len == 0) {
2477                 ifsta->extra_ie = NULL;
2478                 ifsta->extra_ie_len = 0;
2479                 return 0;
2480         }
2481         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2482         if (!ifsta->extra_ie) {
2483                 ifsta->extra_ie_len = 0;
2484                 return -ENOMEM;
2485         }
2486         memcpy(ifsta->extra_ie, ie, len);
2487         ifsta->extra_ie_len = len;
2488         return 0;
2489 }
2490
2491 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2492 {
2493         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2494
2495         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2496                sdata->dev->name, reason);
2497
2498         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2499             sdata->vif.type != NL80211_IFTYPE_ADHOC)
2500                 return -EINVAL;
2501
2502         ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2503         return 0;
2504 }
2505
2506 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2507 {
2508         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2509
2510         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2511                sdata->dev->name, reason);
2512
2513         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2514                 return -EINVAL;
2515
2516         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2517                 return -1;
2518
2519         ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2520         return 0;
2521 }
2522
2523 /* scan finished notification */
2524 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2525 {
2526         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2527         struct ieee80211_if_sta *ifsta;
2528
2529         if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2530                 ifsta = &sdata->u.sta;
2531                 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2532                     (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2533                     !ieee80211_sta_active_ibss(sdata)))
2534                         ieee80211_sta_find_ibss(sdata, ifsta);
2535         }
2536
2537         /* Restart STA timers */
2538         rcu_read_lock();
2539         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2540                 ieee80211_restart_sta_timer(sdata);
2541         rcu_read_unlock();
2542 }
2543
2544 /* driver notification call */
2545 void ieee80211_notify_mac(struct ieee80211_hw *hw,
2546                           enum ieee80211_notification_types  notif_type)
2547 {
2548         struct ieee80211_local *local = hw_to_local(hw);
2549         struct ieee80211_sub_if_data *sdata;
2550
2551         switch (notif_type) {
2552         case IEEE80211_NOTIFY_RE_ASSOC:
2553                 rcu_read_lock();
2554                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2555                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2556                                 continue;
2557
2558                         ieee80211_sta_req_auth(sdata, &sdata->u.sta);
2559                 }
2560                 rcu_read_unlock();
2561                 break;
2562         }
2563 }
2564 EXPORT_SYMBOL(ieee80211_notify_mac);