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/if_arp.h>
  18 #include <linux/wireless.h>
  19 #include <linux/random.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <net/iw_handler.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "rate.h"
  28 #include "led.h"
  29
  30 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
  31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  32 #define IEEE80211_AUTH_MAX_TRIES 3
  33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  34 #define IEEE80211_ASSOC_MAX_TRIES 3
  35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  36 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
  37 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  38 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  39 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
  40 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  41
  42 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  43 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  44
  45 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  46
  47
  48 /* utils */
  49 static int ecw2cw(int ecw)
  50 {
  51         return (1 << ecw) - 1;
  52 }
  53
  54 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  55 {
  56         u8 *end, *pos;
  57
  58         pos = bss->ies;
  59         if (pos == NULL)
  60                 return NULL;
  61         end = pos + bss->ies_len;
  62
  63         while (pos + 1 < end) {
  64                 if (pos + 2 + pos[1] > end)
  65                         break;
  66                 if (pos[0] == ie)
  67                         return pos;
  68                 pos += 2 + pos[1];
  69         }
  70
  71         return NULL;
  72 }
  73
  74 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  75                                       struct ieee80211_supported_band *sband,
  76                                       u64 *rates)
  77 {
  78         int i, j, count;
  79         *rates = 0;
  80         count = 0;
  81         for (i = 0; i < bss->supp_rates_len; i++) {
  82                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  83
  84                 for (j = 0; j < sband->n_bitrates; j++)
  85                         if (sband->bitrates[j].bitrate == rate) {
  86                                 *rates |= BIT(j);
  87                                 count++;
  88                                 break;
  89                         }
  90         }
  91
  92         return count;
  93 }
  94
  95 /* also used by mesh code */
  96 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
  97                             struct ieee802_11_elems *elems,
  98                             enum ieee80211_band band)
  99 {
 100         struct ieee80211_supported_band *sband;
 101         struct ieee80211_rate *bitrates;
 102         size_t num_rates;
 103         u64 supp_rates;
 104         int i, j;
 105         sband = local->hw.wiphy->bands[band];
 106
 107         if (!sband) {
 108                 WARN_ON(1);
 109                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 110         }
 111
 112         bitrates = sband->bitrates;
 113         num_rates = sband->n_bitrates;
 114         supp_rates = 0;
 115         for (i = 0; i < elems->supp_rates_len +
 116                      elems->ext_supp_rates_len; i++) {
 117                 u8 rate = 0;
 118                 int own_rate;
 119                 if (i < elems->supp_rates_len)
 120                         rate = elems->supp_rates[i];
 121                 else if (elems->ext_supp_rates)
 122                         rate = elems->ext_supp_rates
 123                                 [i - elems->supp_rates_len];
 124                 own_rate = 5 * (rate & 0x7f);
 125                 for (j = 0; j < num_rates; j++)
 126                         if (bitrates[j].bitrate == own_rate)
 127                                 supp_rates |= BIT(j);
 128         }
 129         return supp_rates;
 130 }
 131
 132 /* frame sending functions */
 133
 134 /* also used by scanning code */
 135 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 136                               u8 *ssid, size_t ssid_len)
 137 {
 138         struct ieee80211_local *local = sdata->local;
 139         struct ieee80211_supported_band *sband;
 140         struct sk_buff *skb;
 141         struct ieee80211_mgmt *mgmt;
 142         u8 *pos, *supp_rates, *esupp_rates = NULL;
 143         int i;
 144
 145         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
 146         if (!skb) {
 147                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 148                        "request\n", sdata->dev->name);
 149                 return;
 150         }
 151         skb_reserve(skb, local->hw.extra_tx_headroom);
 152
 153         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 154         memset(mgmt, 0, 24);
 155         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 156                                           IEEE80211_STYPE_PROBE_REQ);
 157         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 158         if (dst) {
 159                 memcpy(mgmt->da, dst, ETH_ALEN);
 160                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 161         } else {
 162                 memset(mgmt->da, 0xff, ETH_ALEN);
 163                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 164         }
 165         pos = skb_put(skb, 2 + ssid_len);
 166         *pos++ = WLAN_EID_SSID;
 167         *pos++ = ssid_len;
 168         memcpy(pos, ssid, ssid_len);
 169
 170         supp_rates = skb_put(skb, 2);
 171         supp_rates[0] = WLAN_EID_SUPP_RATES;
 172         supp_rates[1] = 0;
 173         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 174
 175         for (i = 0; i < sband->n_bitrates; i++) {
 176                 struct ieee80211_rate *rate = &sband->bitrates[i];
 177                 if (esupp_rates) {
 178                         pos = skb_put(skb, 1);
 179                         esupp_rates[1]++;
 180                 } else if (supp_rates[1] == 8) {
 181                         esupp_rates = skb_put(skb, 3);
 182                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 183                         esupp_rates[1] = 1;
 184                         pos = &esupp_rates[2];
 185                 } else {
 186                         pos = skb_put(skb, 1);
 187                         supp_rates[1]++;
 188                 }
 189                 *pos = rate->bitrate / 5;
 190         }
 191
 192         ieee80211_tx_skb(sdata, skb, 0);
 193 }
 194
 195 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 196                                 struct ieee80211_if_sta *ifsta,
 197                                 int transaction, u8 *extra, size_t extra_len,
 198                                 int encrypt)
 199 {
 200         struct ieee80211_local *local = sdata->local;
 201         struct sk_buff *skb;
 202         struct ieee80211_mgmt *mgmt;
 203
 204         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 205                             sizeof(*mgmt) + 6 + extra_len);
 206         if (!skb) {
 207                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 208                        "frame\n", sdata->dev->name);
 209                 return;
 210         }
 211         skb_reserve(skb, local->hw.extra_tx_headroom);
 212
 213         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 214         memset(mgmt, 0, 24 + 6);
 215         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 216                                           IEEE80211_STYPE_AUTH);
 217         if (encrypt)
 218                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 219         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 220         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 221         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 222         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
 223         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 224         ifsta->auth_transaction = transaction + 1;
 225         mgmt->u.auth.status_code = cpu_to_le16(0);
 226         if (extra)
 227                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 228
 229         ieee80211_tx_skb(sdata, skb, encrypt);
 230 }
 231
 232 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
 233                                  struct ieee80211_if_sta *ifsta)
 234 {
 235         struct ieee80211_local *local = sdata->local;
 236         struct sk_buff *skb;
 237         struct ieee80211_mgmt *mgmt;
 238         u8 *pos, *ies, *ht_ie;
 239         int i, len, count, rates_len, supp_rates_len;
 240         u16 capab;
 241         struct ieee80211_bss *bss;
 242         int wmm = 0;
 243         struct ieee80211_supported_band *sband;
 244         u64 rates = 0;
 245
 246         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 247                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
 248                             ifsta->ssid_len);
 249         if (!skb) {
 250                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 251                        "frame\n", sdata->dev->name);
 252                 return;
 253         }
 254         skb_reserve(skb, local->hw.extra_tx_headroom);
 255
 256         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 257
 258         capab = ifsta->capab;
 259
 260         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 261                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 262                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 263                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 264                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 265         }
 266
 267         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 268                                    local->hw.conf.channel->center_freq,
 269                                    ifsta->ssid, ifsta->ssid_len);
 270         if (bss) {
 271                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 272                         capab |= WLAN_CAPABILITY_PRIVACY;
 273                 if (bss->wmm_used)
 274                         wmm = 1;
 275
 276                 /* get all rates supported by the device and the AP as
 277                  * some APs don't like getting a superset of their rates
 278                  * in the association request (e.g. D-Link DAP 1353 in
 279                  * b-only mode) */
 280                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 281
 282                 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 283                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 284                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 285
 286                 ieee80211_rx_bss_put(local, bss);
 287         } else {
 288                 rates = ~0;
 289                 rates_len = sband->n_bitrates;
 290         }
 291
 292         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 293         memset(mgmt, 0, 24);
 294         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 295         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 296         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 297
 298         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 299                 skb_put(skb, 10);
 300                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 301                                                   IEEE80211_STYPE_REASSOC_REQ);
 302                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 303                 mgmt->u.reassoc_req.listen_interval =
 304                                 cpu_to_le16(local->hw.conf.listen_interval);
 305                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
 306                        ETH_ALEN);
 307         } else {
 308                 skb_put(skb, 4);
 309                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 310                                                   IEEE80211_STYPE_ASSOC_REQ);
 311                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 312                 mgmt->u.assoc_req.listen_interval =
 313                                 cpu_to_le16(local->hw.conf.listen_interval);
 314         }
 315
 316         /* SSID */
 317         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
 318         *pos++ = WLAN_EID_SSID;
 319         *pos++ = ifsta->ssid_len;
 320         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
 321
 322         /* add all rates which were marked to be used above */
 323         supp_rates_len = rates_len;
 324         if (supp_rates_len > 8)
 325                 supp_rates_len = 8;
 326
 327         len = sband->n_bitrates;
 328         pos = skb_put(skb, supp_rates_len + 2);
 329         *pos++ = WLAN_EID_SUPP_RATES;
 330         *pos++ = supp_rates_len;
 331
 332         count = 0;
 333         for (i = 0; i < sband->n_bitrates; i++) {
 334                 if (BIT(i) & rates) {
 335                         int rate = sband->bitrates[i].bitrate;
 336                         *pos++ = (u8) (rate / 5);
 337                         if (++count == 8)
 338                                 break;
 339                 }
 340         }
 341
 342         if (rates_len > count) {
 343                 pos = skb_put(skb, rates_len - count + 2);
 344                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 345                 *pos++ = rates_len - count;
 346
 347                 for (i++; i < sband->n_bitrates; i++) {
 348                         if (BIT(i) & rates) {
 349                                 int rate = sband->bitrates[i].bitrate;
 350                                 *pos++ = (u8) (rate / 5);
 351                         }
 352                 }
 353         }
 354
 355         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 356                 /* 1. power capabilities */
 357                 pos = skb_put(skb, 4);
 358                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 359                 *pos++ = 2;
 360                 *pos++ = 0; /* min tx power */
 361                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 362
 363                 /* 2. supported channels */
 364                 /* TODO: get this in reg domain format */
 365                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 366                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 367                 *pos++ = 2 * sband->n_channels;
 368                 for (i = 0; i < sband->n_channels; i++) {
 369                         *pos++ = ieee80211_frequency_to_channel(
 370                                         sband->channels[i].center_freq);
 371                         *pos++ = 1; /* one channel in the subband*/
 372                 }
 373         }
 374
 375         if (ifsta->extra_ie) {
 376                 pos = skb_put(skb, ifsta->extra_ie_len);
 377                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
 378         }
 379
 380         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
 381                 pos = skb_put(skb, 9);
 382                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 383                 *pos++ = 7; /* len */
 384                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 385                 *pos++ = 0x50;
 386                 *pos++ = 0xf2;
 387                 *pos++ = 2; /* WME */
 388                 *pos++ = 0; /* WME info */
 389                 *pos++ = 1; /* WME ver */
 390                 *pos++ = 0;
 391         }
 392
 393         /* wmm support is a must to HT */
 394         /*
 395          * IEEE802.11n does not allow TKIP/WEP as pairwise
 396          * ciphers in HT mode. We still associate in non-ht
 397          * mode (11a/b/g) if any one of these ciphers is
 398          * configured as pairwise.
 399          */
 400         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
 401             sband->ht_cap.ht_supported &&
 402             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
 403             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 404             (!(ifsta->flags & IEEE80211_STA_TKIP_WEP_USED))) {
 405                 struct ieee80211_ht_info *ht_info =
 406                         (struct ieee80211_ht_info *)(ht_ie + 2);
 407                 u16 cap = sband->ht_cap.cap;
 408                 __le16 tmp;
 409                 u32 flags = local->hw.conf.channel->flags;
 410
 411                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 412                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 413                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 414                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 415                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 416                         }
 417                         break;
 418                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 419                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 420                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 421                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 422                         }
 423                         break;
 424                 }
 425
 426                 tmp = cpu_to_le16(cap);
 427                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 428                 *pos++ = WLAN_EID_HT_CAPABILITY;
 429                 *pos++ = sizeof(struct ieee80211_ht_cap);
 430                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 431                 memcpy(pos, &tmp, sizeof(u16));
 432                 pos += sizeof(u16);
 433                 /* TODO: needs a define here for << 2 */
 434                 *pos++ = sband->ht_cap.ampdu_factor |
 435                          (sband->ht_cap.ampdu_density << 2);
 436                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 437         }
 438
 439         kfree(ifsta->assocreq_ies);
 440         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
 441         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
 442         if (ifsta->assocreq_ies)
 443                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
 444
 445         ieee80211_tx_skb(sdata, skb, 0);
 446 }
 447
 448
 449 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 450                                            u16 stype, u16 reason)
 451 {
 452         struct ieee80211_local *local = sdata->local;
 453         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 454         struct sk_buff *skb;
 455         struct ieee80211_mgmt *mgmt;
 456
 457         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 458         if (!skb) {
 459                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 460                        "deauth/disassoc frame\n", sdata->dev->name);
 461                 return;
 462         }
 463         skb_reserve(skb, local->hw.extra_tx_headroom);
 464
 465         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 466         memset(mgmt, 0, 24);
 467         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 468         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 469         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 470         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 471         skb_put(skb, 2);
 472         /* u.deauth.reason_code == u.disassoc.reason_code */
 473         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 474
 475         ieee80211_tx_skb(sdata, skb, 0);
 476 }
 477
 478 /* MLME */
 479 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 480                                          struct ieee80211_bss *bss)
 481 {
 482         struct ieee80211_local *local = sdata->local;
 483         int i, have_higher_than_11mbit = 0;
 484
 485         /* cf. IEEE 802.11 9.2.12 */
 486         for (i = 0; i < bss->supp_rates_len; i++)
 487                 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
 488                         have_higher_than_11mbit = 1;
 489
 490         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 491             have_higher_than_11mbit)
 492                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 493         else
 494                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 495
 496         ieee80211_set_wmm_default(sdata);
 497 }
 498
 499 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 500                                      struct ieee80211_if_sta *ifsta,
 501                                      u8 *wmm_param, size_t wmm_param_len)
 502 {
 503         struct ieee80211_tx_queue_params params;
 504         size_t left;
 505         int count;
 506         u8 *pos;
 507
 508         if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
 509                 return;
 510
 511         if (!wmm_param)
 512                 return;
 513
 514         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 515                 return;
 516         count = wmm_param[6] & 0x0f;
 517         if (count == ifsta->wmm_last_param_set)
 518                 return;
 519         ifsta->wmm_last_param_set = count;
 520
 521         pos = wmm_param + 8;
 522         left = wmm_param_len - 8;
 523
 524         memset(&params, 0, sizeof(params));
 525
 526         if (!local->ops->conf_tx)
 527                 return;
 528
 529         local->wmm_acm = 0;
 530         for (; left >= 4; left -= 4, pos += 4) {
 531                 int aci = (pos[0] >> 5) & 0x03;
 532                 int acm = (pos[0] >> 4) & 0x01;
 533                 int queue;
 534
 535                 switch (aci) {
 536                 case 1:
 537                         queue = 3;
 538                         if (acm)
 539                                 local->wmm_acm |= BIT(0) | BIT(3);
 540                         break;
 541                 case 2:
 542                         queue = 1;
 543                         if (acm)
 544                                 local->wmm_acm |= BIT(4) | BIT(5);
 545                         break;
 546                 case 3:
 547                         queue = 0;
 548                         if (acm)
 549                                 local->wmm_acm |= BIT(6) | BIT(7);
 550                         break;
 551                 case 0:
 552                 default:
 553                         queue = 2;
 554                         if (acm)
 555                                 local->wmm_acm |= BIT(1) | BIT(2);
 556                         break;
 557                 }
 558
 559                 params.aifs = pos[0] & 0x0f;
 560                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 561                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 562                 params.txop = get_unaligned_le16(pos + 2);
 563 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 564                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 565                        "cWmin=%d cWmax=%d txop=%d\n",
 566                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 567                        params.cw_max, params.txop);
 568 #endif
 569                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
 570                  * AC for now) */
 571                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 572                         printk(KERN_DEBUG "%s: failed to set TX queue "
 573                                "parameters for queue %d\n", local->mdev->name, queue);
 574                 }
 575         }
 576 }
 577
 578 static bool check_tim(struct ieee802_11_elems *elems, u16 aid, bool *is_mc)
 579 {
 580         u8 mask;
 581         u8 index, indexn1, indexn2;
 582         struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
 583
 584         aid &= 0x3fff;
 585         index = aid / 8;
 586         mask  = 1 << (aid & 7);
 587
 588         if (tim->bitmap_ctrl & 0x01)
 589                 *is_mc = true;
 590
 591         indexn1 = tim->bitmap_ctrl & 0xfe;
 592         indexn2 = elems->tim_len + indexn1 - 4;
 593
 594         if (index < indexn1 || index > indexn2)
 595                 return false;
 596
 597         index -= indexn1;
 598
 599         return !!(tim->virtual_map[index] & mask);
 600 }
 601
 602 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 603                                            u16 capab, bool erp_valid, u8 erp)
 604 {
 605         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 606 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 607         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 608 #endif
 609         u32 changed = 0;
 610         bool use_protection;
 611         bool use_short_preamble;
 612         bool use_short_slot;
 613
 614         if (erp_valid) {
 615                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 616                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 617         } else {
 618                 use_protection = false;
 619                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 620         }
 621
 622         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 623
 624         if (use_protection != bss_conf->use_cts_prot) {
 625 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 626                 if (net_ratelimit()) {
 627                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 628                                sdata->dev->name,
 629                                use_protection ? "enabled" : "disabled",
 630                                ifsta->bssid);
 631                 }
 632 #endif
 633                 bss_conf->use_cts_prot = use_protection;
 634                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 635         }
 636
 637         if (use_short_preamble != bss_conf->use_short_preamble) {
 638 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 639                 if (net_ratelimit()) {
 640                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 641                                " (BSSID=%pM)\n",
 642                                sdata->dev->name,
 643                                use_short_preamble ? "short" : "long",
 644                                ifsta->bssid);
 645                 }
 646 #endif
 647                 bss_conf->use_short_preamble = use_short_preamble;
 648                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 649         }
 650
 651         if (use_short_slot != bss_conf->use_short_slot) {
 652 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 653                 if (net_ratelimit()) {
 654                         printk(KERN_DEBUG "%s: switched to %s slot time"
 655                                " (BSSID=%pM)\n",
 656                                sdata->dev->name,
 657                                use_short_slot ? "short" : "long",
 658                                ifsta->bssid);
 659                 }
 660 #endif
 661                 bss_conf->use_short_slot = use_short_slot;
 662                 changed |= BSS_CHANGED_ERP_SLOT;
 663         }
 664
 665         return changed;
 666 }
 667
 668 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
 669                                         struct ieee80211_if_sta *ifsta)
 670 {
 671         union iwreq_data wrqu;
 672         memset(&wrqu, 0, sizeof(wrqu));
 673         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
 674                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
 675         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 676         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 677 }
 678
 679 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
 680                                          struct ieee80211_if_sta *ifsta)
 681 {
 682         char *buf;
 683         size_t len;
 684         int i;
 685         union iwreq_data wrqu;
 686
 687         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
 688                 return;
 689
 690         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
 691                                 ifsta->assocresp_ies_len), GFP_KERNEL);
 692         if (!buf)
 693                 return;
 694
 695         len = sprintf(buf, "ASSOCINFO(");
 696         if (ifsta->assocreq_ies) {
 697                 len += sprintf(buf + len, "ReqIEs=");
 698                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
 699                         len += sprintf(buf + len, "%02x",
 700                                        ifsta->assocreq_ies[i]);
 701                 }
 702         }
 703         if (ifsta->assocresp_ies) {
 704                 if (ifsta->assocreq_ies)
 705                         len += sprintf(buf + len, " ");
 706                 len += sprintf(buf + len, "RespIEs=");
 707                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 708                         len += sprintf(buf + len, "%02x",
 709                                        ifsta->assocresp_ies[i]);
 710                 }
 711         }
 712         len += sprintf(buf + len, ")");
 713
 714         if (len > IW_CUSTOM_MAX) {
 715                 len = sprintf(buf, "ASSOCRESPIE=");
 716                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 717                         len += sprintf(buf + len, "%02x",
 718                                        ifsta->assocresp_ies[i]);
 719                 }
 720         }
 721
 722         if (len <= IW_CUSTOM_MAX) {
 723                 memset(&wrqu, 0, sizeof(wrqu));
 724                 wrqu.data.length = len;
 725                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 726         }
 727
 728         kfree(buf);
 729 }
 730
 731
 732 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 733                                      struct ieee80211_if_sta *ifsta,
 734                                      u32 bss_info_changed)
 735 {
 736         struct ieee80211_local *local = sdata->local;
 737         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 738
 739         struct ieee80211_bss *bss;
 740
 741         bss_info_changed |= BSS_CHANGED_ASSOC;
 742         ifsta->flags |= IEEE80211_STA_ASSOCIATED;
 743
 744         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 745                 return;
 746
 747         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 748                                    conf->channel->center_freq,
 749                                    ifsta->ssid, ifsta->ssid_len);
 750         if (bss) {
 751                 /* set timing information */
 752                 sdata->vif.bss_conf.beacon_int = bss->beacon_int;
 753                 sdata->vif.bss_conf.timestamp = bss->timestamp;
 754                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 755
 756                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 757                         bss->capability, bss->has_erp_value, bss->erp_value);
 758
 759                 ieee80211_rx_bss_put(local, bss);
 760         }
 761
 762         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
 763         memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 764         ieee80211_sta_send_associnfo(sdata, ifsta);
 765
 766         ifsta->last_probe = jiffies;
 767         ieee80211_led_assoc(local, 1);
 768
 769         sdata->vif.bss_conf.assoc = 1;
 770         /*
 771          * For now just always ask the driver to update the basic rateset
 772          * when we have associated, we aren't checking whether it actually
 773          * changed or not.
 774          */
 775         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 776         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 777
 778         if (local->powersave &&
 779                         !(local->hw.flags & IEEE80211_HW_NO_STACK_DYNAMIC_PS)) {
 780                 if (local->dynamic_ps_timeout > 0)
 781                         mod_timer(&local->dynamic_ps_timer, jiffies +
 782                                   msecs_to_jiffies(local->dynamic_ps_timeout));
 783                 else {
 784                         ieee80211_send_nullfunc(local, sdata, 1);
 785                         conf->flags |= IEEE80211_CONF_PS;
 786                         ieee80211_hw_config(local,
 787                                             IEEE80211_CONF_CHANGE_PS);
 788                 }
 789         }
 790
 791         netif_tx_start_all_queues(sdata->dev);
 792         netif_carrier_on(sdata->dev);
 793
 794         ieee80211_sta_send_apinfo(sdata, ifsta);
 795 }
 796
 797 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
 798                                    struct ieee80211_if_sta *ifsta)
 799 {
 800         ifsta->direct_probe_tries++;
 801         if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 802                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 803                        sdata->dev->name, ifsta->bssid);
 804                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 805                 ieee80211_sta_send_apinfo(sdata, ifsta);
 806                 return;
 807         }
 808
 809         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 810                         sdata->dev->name, ifsta->bssid,
 811                         ifsta->direct_probe_tries);
 812
 813         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 814
 815         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
 816
 817         /* Direct probe is sent to broadcast address as some APs
 818          * will not answer to direct packet in unassociated state.
 819          */
 820         ieee80211_send_probe_req(sdata, NULL,
 821                                  ifsta->ssid, ifsta->ssid_len);
 822
 823         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 824 }
 825
 826
 827 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
 828                                    struct ieee80211_if_sta *ifsta)
 829 {
 830         ifsta->auth_tries++;
 831         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 832                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 833                        " timed out\n",
 834                        sdata->dev->name, ifsta->bssid);
 835                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 836                 ieee80211_sta_send_apinfo(sdata, ifsta);
 837                 return;
 838         }
 839
 840         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
 841         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 842                sdata->dev->name, ifsta->bssid);
 843
 844         ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
 845
 846         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 847 }
 848
 849 /*
 850  * The disassoc 'reason' argument can be either our own reason
 851  * if self disconnected or a reason code from the AP.
 852  */
 853 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 854                                    struct ieee80211_if_sta *ifsta, bool deauth,
 855                                    bool self_disconnected, u16 reason)
 856 {
 857         struct ieee80211_local *local = sdata->local;
 858         struct sta_info *sta;
 859         u32 changed = 0, config_changed = 0;
 860
 861         rcu_read_lock();
 862
 863         sta = sta_info_get(local, ifsta->bssid);
 864         if (!sta) {
 865                 rcu_read_unlock();
 866                 return;
 867         }
 868
 869         if (deauth) {
 870                 ifsta->direct_probe_tries = 0;
 871                 ifsta->auth_tries = 0;
 872         }
 873         ifsta->assoc_scan_tries = 0;
 874         ifsta->assoc_tries = 0;
 875
 876         netif_tx_stop_all_queues(sdata->dev);
 877         netif_carrier_off(sdata->dev);
 878
 879         ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
 880
 881         if (self_disconnected) {
 882                 if (deauth)
 883                         ieee80211_send_deauth_disassoc(sdata,
 884                                 IEEE80211_STYPE_DEAUTH, reason);
 885                 else
 886                         ieee80211_send_deauth_disassoc(sdata,
 887                                 IEEE80211_STYPE_DISASSOC, reason);
 888         }
 889
 890         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
 891         changed |= ieee80211_reset_erp_info(sdata);
 892
 893         ieee80211_led_assoc(local, 0);
 894         changed |= BSS_CHANGED_ASSOC;
 895         sdata->vif.bss_conf.assoc = false;
 896
 897         ieee80211_sta_send_apinfo(sdata, ifsta);
 898
 899         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT)
 900                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 901
 902         rcu_read_unlock();
 903
 904         /* channel(_type) changes are handled by ieee80211_hw_config */
 905         local->oper_channel_type = NL80211_CHAN_NO_HT;
 906
 907         del_timer_sync(&local->dynamic_ps_timer);
 908         cancel_work_sync(&local->dynamic_ps_enable_work);
 909
 910         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 911                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 912                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 913         }
 914
 915         ieee80211_hw_config(local, config_changed);
 916         ieee80211_bss_info_change_notify(sdata, changed);
 917
 918         rcu_read_lock();
 919
 920         sta = sta_info_get(local, ifsta->bssid);
 921         if (!sta) {
 922                 rcu_read_unlock();
 923                 return;
 924         }
 925
 926         sta_info_unlink(&sta);
 927
 928         rcu_read_unlock();
 929
 930         sta_info_destroy(sta);
 931 }
 932
 933 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
 934 {
 935         if (!sdata || !sdata->default_key ||
 936             sdata->default_key->conf.alg != ALG_WEP)
 937                 return 0;
 938         return 1;
 939 }
 940
 941 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
 942                                       struct ieee80211_if_sta *ifsta)
 943 {
 944         struct ieee80211_local *local = sdata->local;
 945         struct ieee80211_bss *bss;
 946         int bss_privacy;
 947         int wep_privacy;
 948         int privacy_invoked;
 949
 950         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
 951                 return 0;
 952
 953         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 954                                    local->hw.conf.channel->center_freq,
 955                                    ifsta->ssid, ifsta->ssid_len);
 956         if (!bss)
 957                 return 0;
 958
 959         bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
 960         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
 961         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
 962
 963         ieee80211_rx_bss_put(local, bss);
 964
 965         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
 966                 return 0;
 967
 968         return 1;
 969 }
 970
 971 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
 972                                 struct ieee80211_if_sta *ifsta)
 973 {
 974         ifsta->assoc_tries++;
 975         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 976                 printk(KERN_DEBUG "%s: association with AP %pM"
 977                        " timed out\n",
 978                        sdata->dev->name, ifsta->bssid);
 979                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 980                 ieee80211_sta_send_apinfo(sdata, ifsta);
 981                 return;
 982         }
 983
 984         ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
 985         printk(KERN_DEBUG "%s: associate with AP %pM\n",
 986                sdata->dev->name, ifsta->bssid);
 987         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
 988                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 989                        "mixed-cell disabled - abort association\n", sdata->dev->name);
 990                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 991                 return;
 992         }
 993
 994         ieee80211_send_assoc(sdata, ifsta);
 995
 996         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 997 }
 998
 999
1000 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1001                                  struct ieee80211_if_sta *ifsta)
1002 {
1003         struct ieee80211_local *local = sdata->local;
1004         struct sta_info *sta;
1005         int disassoc;
1006
1007         /* TODO: start monitoring current AP signal quality and number of
1008          * missed beacons. Scan other channels every now and then and search
1009          * for better APs. */
1010         /* TODO: remove expired BSSes */
1011
1012         ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1013
1014         rcu_read_lock();
1015
1016         sta = sta_info_get(local, ifsta->bssid);
1017         if (!sta) {
1018                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1019                        sdata->dev->name, ifsta->bssid);
1020                 disassoc = 1;
1021         } else {
1022                 disassoc = 0;
1023                 if (time_after(jiffies,
1024                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1025                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1026                                 printk(KERN_DEBUG "%s: No ProbeResp from "
1027                                        "current AP %pM - assume out of "
1028                                        "range\n",
1029                                        sdata->dev->name, ifsta->bssid);
1030                                 disassoc = 1;
1031                         } else
1032                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1033                                                          ifsta->ssid,
1034                                                          ifsta->ssid_len);
1035                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1036                 } else {
1037                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1038                         if (time_after(jiffies, ifsta->last_probe +
1039                                        IEEE80211_PROBE_INTERVAL)) {
1040                                 ifsta->last_probe = jiffies;
1041                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1042                                                          ifsta->ssid,
1043                                                          ifsta->ssid_len);
1044                         }
1045                 }
1046         }
1047
1048         rcu_read_unlock();
1049
1050         if (disassoc)
1051                 ieee80211_set_disassoc(sdata, ifsta, true, true,
1052                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1053         else
1054                 mod_timer(&ifsta->timer, jiffies +
1055                                       IEEE80211_MONITORING_INTERVAL);
1056 }
1057
1058
1059 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1060                                      struct ieee80211_if_sta *ifsta)
1061 {
1062         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1063         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1064         ieee80211_associate(sdata, ifsta);
1065 }
1066
1067
1068 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1069                                      struct ieee80211_if_sta *ifsta,
1070                                      struct ieee80211_mgmt *mgmt,
1071                                      size_t len)
1072 {
1073         u8 *pos;
1074         struct ieee802_11_elems elems;
1075
1076         pos = mgmt->u.auth.variable;
1077         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1078         if (!elems.challenge)
1079                 return;
1080         ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1081                             elems.challenge_len + 2, 1);
1082 }
1083
1084 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1085                                    struct ieee80211_if_sta *ifsta,
1086                                    struct ieee80211_mgmt *mgmt,
1087                                    size_t len)
1088 {
1089         u16 auth_alg, auth_transaction, status_code;
1090
1091         if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1092             sdata->vif.type != NL80211_IFTYPE_ADHOC)
1093                 return;
1094
1095         if (len < 24 + 6)
1096                 return;
1097
1098         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1099             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1100                 return;
1101
1102         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1103             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1104                 return;
1105
1106         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1107         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1108         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1109
1110         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1111                 /*
1112                  * IEEE 802.11 standard does not require authentication in IBSS
1113                  * networks and most implementations do not seem to use it.
1114                  * However, try to reply to authentication attempts if someone
1115                  * has actually implemented this.
1116                  */
1117                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1118                         return;
1119                 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1120         }
1121
1122         if (auth_alg != ifsta->auth_alg ||
1123             auth_transaction != ifsta->auth_transaction)
1124                 return;
1125
1126         if (status_code != WLAN_STATUS_SUCCESS) {
1127                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1128                         u8 algs[3];
1129                         const int num_algs = ARRAY_SIZE(algs);
1130                         int i, pos;
1131                         algs[0] = algs[1] = algs[2] = 0xff;
1132                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1133                                 algs[0] = WLAN_AUTH_OPEN;
1134                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1135                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1136                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1137                                 algs[2] = WLAN_AUTH_LEAP;
1138                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1139                                 pos = 0;
1140                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1141                                 pos = 1;
1142                         else
1143                                 pos = 2;
1144                         for (i = 0; i < num_algs; i++) {
1145                                 pos++;
1146                                 if (pos >= num_algs)
1147                                         pos = 0;
1148                                 if (algs[pos] == ifsta->auth_alg ||
1149                                     algs[pos] == 0xff)
1150                                         continue;
1151                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1152                                     !ieee80211_sta_wep_configured(sdata))
1153                                         continue;
1154                                 ifsta->auth_alg = algs[pos];
1155                                 break;
1156                         }
1157                 }
1158                 return;
1159         }
1160
1161         switch (ifsta->auth_alg) {
1162         case WLAN_AUTH_OPEN:
1163         case WLAN_AUTH_LEAP:
1164                 ieee80211_auth_completed(sdata, ifsta);
1165                 break;
1166         case WLAN_AUTH_SHARED_KEY:
1167                 if (ifsta->auth_transaction == 4)
1168                         ieee80211_auth_completed(sdata, ifsta);
1169                 else
1170                         ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1171                 break;
1172         }
1173 }
1174
1175
1176 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1177                                      struct ieee80211_if_sta *ifsta,
1178                                      struct ieee80211_mgmt *mgmt,
1179                                      size_t len)
1180 {
1181         u16 reason_code;
1182
1183         if (len < 24 + 2)
1184                 return;
1185
1186         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1187                 return;
1188
1189         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1190
1191         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1192                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1193                                 sdata->dev->name, reason_code);
1194
1195         if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1196             ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1197             ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1198                 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1199                 mod_timer(&ifsta->timer, jiffies +
1200                                       IEEE80211_RETRY_AUTH_INTERVAL);
1201         }
1202
1203         ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1204         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1205 }
1206
1207
1208 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1209                                        struct ieee80211_if_sta *ifsta,
1210                                        struct ieee80211_mgmt *mgmt,
1211                                        size_t len)
1212 {
1213         u16 reason_code;
1214
1215         if (len < 24 + 2)
1216                 return;
1217
1218         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1219                 return;
1220
1221         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1222
1223         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1224                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1225                                 sdata->dev->name, reason_code);
1226
1227         if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1228                 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1229                 mod_timer(&ifsta->timer, jiffies +
1230                                       IEEE80211_RETRY_AUTH_INTERVAL);
1231         }
1232
1233         ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1234 }
1235
1236
1237 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1238                                          struct ieee80211_if_sta *ifsta,
1239                                          struct ieee80211_mgmt *mgmt,
1240                                          size_t len,
1241                                          int reassoc)
1242 {
1243         struct ieee80211_local *local = sdata->local;
1244         struct ieee80211_supported_band *sband;
1245         struct sta_info *sta;
1246         u64 rates, basic_rates;
1247         u16 capab_info, status_code, aid;
1248         struct ieee802_11_elems elems;
1249         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1250         u8 *pos;
1251         u32 changed = 0;
1252         int i, j;
1253         bool have_higher_than_11mbit = false, newsta = false;
1254         u16 ap_ht_cap_flags;
1255
1256         /* AssocResp and ReassocResp have identical structure, so process both
1257          * of them in this function. */
1258
1259         if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1260                 return;
1261
1262         if (len < 24 + 6)
1263                 return;
1264
1265         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1266                 return;
1267
1268         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1269         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1270         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1271
1272         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1273                "status=%d aid=%d)\n",
1274                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1275                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1276
1277         if (status_code != WLAN_STATUS_SUCCESS) {
1278                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1279                        sdata->dev->name, status_code);
1280                 /* if this was a reassociation, ensure we try a "full"
1281                  * association next time. This works around some broken APs
1282                  * which do not correctly reject reassociation requests. */
1283                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1284                 return;
1285         }
1286
1287         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1288                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1289                        "set\n", sdata->dev->name, aid);
1290         aid &= ~(BIT(15) | BIT(14));
1291
1292         pos = mgmt->u.assoc_resp.variable;
1293         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1294
1295         if (!elems.supp_rates) {
1296                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1297                        sdata->dev->name);
1298                 return;
1299         }
1300
1301         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1302         ifsta->aid = aid;
1303         ifsta->ap_capab = capab_info;
1304
1305         kfree(ifsta->assocresp_ies);
1306         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1307         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1308         if (ifsta->assocresp_ies)
1309                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1310
1311         rcu_read_lock();
1312
1313         /* Add STA entry for the AP */
1314         sta = sta_info_get(local, ifsta->bssid);
1315         if (!sta) {
1316                 struct ieee80211_bss *bss;
1317
1318                 newsta = true;
1319
1320                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1321                 if (!sta) {
1322                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1323                                " the AP\n", sdata->dev->name);
1324                         rcu_read_unlock();
1325                         return;
1326                 }
1327                 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1328                                            local->hw.conf.channel->center_freq,
1329                                            ifsta->ssid, ifsta->ssid_len);
1330                 if (bss) {
1331                         sta->last_signal = bss->signal;
1332                         sta->last_qual = bss->qual;
1333                         sta->last_noise = bss->noise;
1334                         ieee80211_rx_bss_put(local, bss);
1335                 }
1336
1337                 /* update new sta with its last rx activity */
1338                 sta->last_rx = jiffies;
1339         }
1340
1341         /*
1342          * FIXME: Do we really need to update the sta_info's information here?
1343          *        We already know about the AP (we found it in our list) so it
1344          *        should already be filled with the right info, no?
1345          *        As is stands, all this is racy because typically we assume
1346          *        the information that is filled in here (except flags) doesn't
1347          *        change while a STA structure is alive. As such, it should move
1348          *        to between the sta_info_alloc() and sta_info_insert() above.
1349          */
1350
1351         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1352                            WLAN_STA_AUTHORIZED);
1353
1354         rates = 0;
1355         basic_rates = 0;
1356         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1357
1358         for (i = 0; i < elems.supp_rates_len; i++) {
1359                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1360                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1361
1362                 if (rate > 110)
1363                         have_higher_than_11mbit = true;
1364
1365                 for (j = 0; j < sband->n_bitrates; j++) {
1366                         if (sband->bitrates[j].bitrate == rate) {
1367                                 rates |= BIT(j);
1368                                 if (is_basic)
1369                                         basic_rates |= BIT(j);
1370                                 break;
1371                         }
1372                 }
1373         }
1374
1375         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1376                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1377                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1378
1379                 if (rate > 110)
1380                         have_higher_than_11mbit = true;
1381
1382                 for (j = 0; j < sband->n_bitrates; j++) {
1383                         if (sband->bitrates[j].bitrate == rate) {
1384                                 rates |= BIT(j);
1385                                 if (is_basic)
1386                                         basic_rates |= BIT(j);
1387                                 break;
1388                         }
1389                 }
1390         }
1391
1392         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1393         sdata->vif.bss_conf.basic_rates = basic_rates;
1394
1395         /* cf. IEEE 802.11 9.2.12 */
1396         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1397             have_higher_than_11mbit)
1398                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1399         else
1400                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1401
1402         if (elems.ht_cap_elem)
1403                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1404                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1405
1406         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1407
1408         rate_control_rate_init(sta);
1409
1410         if (elems.wmm_param)
1411                 set_sta_flags(sta, WLAN_STA_WME);
1412
1413         if (newsta) {
1414                 int err = sta_info_insert(sta);
1415                 if (err) {
1416                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1417                                " the AP (error %d)\n", sdata->dev->name, err);
1418                         rcu_read_unlock();
1419                         return;
1420                 }
1421         }
1422
1423         rcu_read_unlock();
1424
1425         if (elems.wmm_param)
1426                 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1427                                          elems.wmm_param_len);
1428
1429         if (elems.ht_info_elem && elems.wmm_param &&
1430             (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1431                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1432                                                ap_ht_cap_flags);
1433
1434         /* set AID and assoc capability,
1435          * ieee80211_set_associated() will tell the driver */
1436         bss_conf->aid = aid;
1437         bss_conf->assoc_capability = capab_info;
1438         ieee80211_set_associated(sdata, ifsta, changed);
1439
1440         ieee80211_associated(sdata, ifsta);
1441 }
1442
1443
1444 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1445                                    struct ieee80211_if_sta *ifsta,
1446                                    struct ieee80211_bss *bss)
1447 {
1448         struct ieee80211_local *local = sdata->local;
1449         int res, rates, i, j;
1450         struct sk_buff *skb;
1451         struct ieee80211_mgmt *mgmt;
1452         u8 *pos;
1453         struct ieee80211_supported_band *sband;
1454         union iwreq_data wrqu;
1455
1456         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
1457         if (!skb) {
1458                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1459                        "response\n", sdata->dev->name);
1460                 return -ENOMEM;
1461         }
1462
1463         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1464
1465         /* Remove possible STA entries from other IBSS networks. */
1466         sta_info_flush_delayed(sdata);
1467
1468         if (local->ops->reset_tsf) {
1469                 /* Reset own TSF to allow time synchronization work. */
1470                 local->ops->reset_tsf(local_to_hw(local));
1471         }
1472         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1473         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1474         if (res)
1475                 return res;
1476
1477         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1478
1479         sdata->drop_unencrypted = bss->capability &
1480                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1481
1482         res = ieee80211_set_freq(sdata, bss->freq);
1483
1484         if (res)
1485                 return res;
1486
1487         /* Build IBSS probe response */
1488
1489         skb_reserve(skb, local->hw.extra_tx_headroom);
1490
1491         mgmt = (struct ieee80211_mgmt *)
1492                 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1493         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1494         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1495                                                 IEEE80211_STYPE_PROBE_RESP);
1496         memset(mgmt->da, 0xff, ETH_ALEN);
1497         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1498         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1499         mgmt->u.beacon.beacon_int =
1500                 cpu_to_le16(local->hw.conf.beacon_int);
1501         mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1502         mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1503
1504         pos = skb_put(skb, 2 + ifsta->ssid_len);
1505         *pos++ = WLAN_EID_SSID;
1506         *pos++ = ifsta->ssid_len;
1507         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1508
1509         rates = bss->supp_rates_len;
1510         if (rates > 8)
1511                 rates = 8;
1512         pos = skb_put(skb, 2 + rates);
1513         *pos++ = WLAN_EID_SUPP_RATES;
1514         *pos++ = rates;
1515         memcpy(pos, bss->supp_rates, rates);
1516
1517         if (bss->band == IEEE80211_BAND_2GHZ) {
1518                 pos = skb_put(skb, 2 + 1);
1519                 *pos++ = WLAN_EID_DS_PARAMS;
1520                 *pos++ = 1;
1521                 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1522         }
1523
1524         pos = skb_put(skb, 2 + 2);
1525         *pos++ = WLAN_EID_IBSS_PARAMS;
1526         *pos++ = 2;
1527         /* FIX: set ATIM window based on scan results */
1528         *pos++ = 0;
1529         *pos++ = 0;
1530
1531         if (bss->supp_rates_len > 8) {
1532                 rates = bss->supp_rates_len - 8;
1533                 pos = skb_put(skb, 2 + rates);
1534                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1535                 *pos++ = rates;
1536                 memcpy(pos, &bss->supp_rates[8], rates);
1537         }
1538
1539         ifsta->probe_resp = skb;
1540
1541         ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1542
1543
1544         rates = 0;
1545         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1546         for (i = 0; i < bss->supp_rates_len; i++) {
1547                 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1548                 for (j = 0; j < sband->n_bitrates; j++)
1549                         if (sband->bitrates[j].bitrate == bitrate)
1550                                 rates |= BIT(j);
1551         }
1552         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1553
1554         ieee80211_sta_def_wmm_params(sdata, bss);
1555
1556         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1557         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1558
1559         ieee80211_led_assoc(local, true);
1560
1561         memset(&wrqu, 0, sizeof(wrqu));
1562         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1563         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1564
1565         return res;
1566 }
1567
1568 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1569                                   struct ieee80211_mgmt *mgmt,
1570                                   size_t len,
1571                                   struct ieee80211_rx_status *rx_status,
1572                                   struct ieee802_11_elems *elems,
1573                                   bool beacon)
1574 {
1575         struct ieee80211_local *local = sdata->local;
1576         int freq;
1577         struct ieee80211_bss *bss;
1578         struct sta_info *sta;
1579         struct ieee80211_channel *channel;
1580         u64 beacon_timestamp, rx_timestamp;
1581         u64 supp_rates = 0;
1582         enum ieee80211_band band = rx_status->band;
1583
1584         if (elems->ds_params && elems->ds_params_len == 1)
1585                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1586         else
1587                 freq = rx_status->freq;
1588
1589         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1590
1591         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1592                 return;
1593
1594         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1595             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1596                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1597
1598                 rcu_read_lock();
1599
1600                 sta = sta_info_get(local, mgmt->sa);
1601                 if (sta) {
1602                         u64 prev_rates;
1603
1604                         prev_rates = sta->sta.supp_rates[band];
1605                         /* make sure mandatory rates are always added */
1606                         sta->sta.supp_rates[band] = supp_rates |
1607                                 ieee80211_mandatory_rates(local, band);
1608
1609 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1610                         if (sta->sta.supp_rates[band] != prev_rates)
1611                                 printk(KERN_DEBUG "%s: updated supp_rates set "
1612                                     "for %pM based on beacon info (0x%llx | "
1613                                     "0x%llx -> 0x%llx)\n",
1614                                     sdata->dev->name,
1615                                     sta->sta.addr,
1616                                     (unsigned long long) prev_rates,
1617                                     (unsigned long long) supp_rates,
1618                                     (unsigned long long) sta->sta.supp_rates[band]);
1619 #endif
1620                 } else {
1621                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1622                 }
1623
1624                 rcu_read_unlock();
1625         }
1626
1627         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1628                                         freq, beacon);
1629         if (!bss)
1630                 return;
1631
1632         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1633             (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
1634                 struct ieee80211_channel_sw_ie *sw_elem =
1635                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1636                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1637         }
1638
1639         /* was just updated in ieee80211_bss_info_update */
1640         beacon_timestamp = bss->timestamp;
1641
1642         /*
1643          * In STA mode, the remaining parameters should not be overridden
1644          * by beacons because they're not necessarily accurate there.
1645          */
1646         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1647             bss->last_probe_resp && beacon) {
1648                 ieee80211_rx_bss_put(local, bss);
1649                 return;
1650         }
1651
1652         /* check if we need to merge IBSS */
1653         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1654             (!(sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)) &&
1655             bss->capability & WLAN_CAPABILITY_IBSS &&
1656             bss->freq == local->oper_channel->center_freq &&
1657             elems->ssid_len == sdata->u.sta.ssid_len &&
1658             memcmp(elems->ssid, sdata->u.sta.ssid,
1659                                 sdata->u.sta.ssid_len) == 0) {
1660                 if (rx_status->flag & RX_FLAG_TSFT) {
1661                         /* in order for correct IBSS merging we need mactime
1662                          *
1663                          * since mactime is defined as the time the first data
1664                          * symbol of the frame hits the PHY, and the timestamp
1665                          * of the beacon is defined as "the time that the data
1666                          * symbol containing the first bit of the timestamp is
1667                          * transmitted to the PHY plus the transmitting STA’s
1668                          * delays through its local PHY from the MAC-PHY
1669                          * interface to its interface with the WM"
1670                          * (802.11 11.1.2) - equals the time this bit arrives at
1671                          * the receiver - we have to take into account the
1672                          * offset between the two.
1673                          * e.g: at 1 MBit that means mactime is 192 usec earlier
1674                          * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1675                          */
1676                         int rate;
1677                         if (rx_status->flag & RX_FLAG_HT) {
1678                                 rate = 65; /* TODO: HT rates */
1679                         } else {
1680                                 rate = local->hw.wiphy->bands[band]->
1681                                         bitrates[rx_status->rate_idx].bitrate;
1682                         }
1683                         rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1684                 } else if (local && local->ops && local->ops->get_tsf)
1685                         /* second best option: get current TSF */
1686                         rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1687                 else
1688                         /* can't merge without knowing the TSF */
1689                         rx_timestamp = -1LLU;
1690 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1691                 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1692                        "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1693                        mgmt->sa, mgmt->bssid,
1694                        (unsigned long long)rx_timestamp,
1695                        (unsigned long long)beacon_timestamp,
1696                        (unsigned long long)(rx_timestamp - beacon_timestamp),
1697                        jiffies);
1698 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1699                 if (beacon_timestamp > rx_timestamp) {
1700 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1701                         printk(KERN_DEBUG "%s: beacon TSF higher than "
1702                                "local TSF - IBSS merge with BSSID %pM\n",
1703                                sdata->dev->name, mgmt->bssid);
1704 #endif
1705                         ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1706                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1707                 }
1708         }
1709
1710         ieee80211_rx_bss_put(local, bss);
1711 }
1712
1713
1714 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1715                                          struct ieee80211_mgmt *mgmt,
1716                                          size_t len,
1717                                          struct ieee80211_rx_status *rx_status)
1718 {
1719         size_t baselen;
1720         struct ieee802_11_elems elems;
1721         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1722
1723         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1724                 return; /* ignore ProbeResp to foreign address */
1725
1726         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1727         if (baselen > len)
1728                 return;
1729
1730         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1731                                 &elems);
1732
1733         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1734
1735         /* direct probe may be part of the association flow */
1736         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1737                                                         &ifsta->request)) {
1738                 printk(KERN_DEBUG "%s direct probe responded\n",
1739                        sdata->dev->name);
1740                 ieee80211_authenticate(sdata, ifsta);
1741         }
1742 }
1743
1744
1745 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1746                                      struct ieee80211_mgmt *mgmt,
1747                                      size_t len,
1748                                      struct ieee80211_rx_status *rx_status)
1749 {
1750         struct ieee80211_if_sta *ifsta;
1751         size_t baselen;
1752         struct ieee802_11_elems elems;
1753         struct ieee80211_local *local = sdata->local;
1754         u32 changed = 0;
1755         bool erp_valid, directed_tim, is_mc = false;
1756         u8 erp_value = 0;
1757
1758         /* Process beacon from the current BSS */
1759         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1760         if (baselen > len)
1761                 return;
1762
1763         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1764
1765         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1766
1767         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1768                 return;
1769         ifsta = &sdata->u.sta;
1770
1771         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1772             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1773                 return;
1774
1775         if (rx_status->freq != local->hw.conf.channel->center_freq)
1776                 return;
1777
1778         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1779                                  elems.wmm_param_len);
1780
1781         if (!(local->hw.flags & IEEE80211_HW_NO_STACK_DYNAMIC_PS)) {
1782                 directed_tim = check_tim(&elems, ifsta->aid, &is_mc);
1783
1784                 if (directed_tim || is_mc) {
1785                         if (local->hw.conf.flags && IEEE80211_CONF_PS) {
1786                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1787                                 ieee80211_hw_config(local,
1788                                                 IEEE80211_CONF_CHANGE_PS);
1789                                 ieee80211_send_nullfunc(local, sdata, 0);
1790                         }
1791                 }
1792         }
1793
1794         if (elems.erp_info && elems.erp_info_len >= 1) {
1795                 erp_valid = true;
1796                 erp_value = elems.erp_info[0];
1797         } else {
1798                 erp_valid = false;
1799         }
1800         changed |= ieee80211_handle_bss_capability(sdata,
1801                         le16_to_cpu(mgmt->u.beacon.capab_info),
1802                         erp_valid, erp_value);
1803
1804
1805         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1806                 struct sta_info *sta;
1807                 struct ieee80211_supported_band *sband;
1808                 u16 ap_ht_cap_flags;
1809
1810                 rcu_read_lock();
1811
1812                 sta = sta_info_get(local, ifsta->bssid);
1813                 if (!sta) {
1814                         rcu_read_unlock();
1815                         return;
1816                 }
1817
1818                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1819
1820                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1821                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1822
1823                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1824
1825                 rcu_read_unlock();
1826
1827                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1828                                                ap_ht_cap_flags);
1829         }
1830
1831         if (elems.country_elem) {
1832                 /* Note we are only reviewing this on beacons
1833                  * for the BSSID we are associated to */
1834                 regulatory_hint_11d(local->hw.wiphy,
1835                         elems.country_elem, elems.country_elem_len);
1836         }
1837
1838         ieee80211_bss_info_change_notify(sdata, changed);
1839 }
1840
1841
1842 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1843                                         struct ieee80211_if_sta *ifsta,
1844                                         struct ieee80211_mgmt *mgmt,
1845                                         size_t len)
1846 {
1847         struct ieee80211_local *local = sdata->local;
1848         int tx_last_beacon;
1849         struct sk_buff *skb;
1850         struct ieee80211_mgmt *resp;
1851         u8 *pos, *end;
1852
1853         if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1854             ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1855             len < 24 + 2 || !ifsta->probe_resp)
1856                 return;
1857
1858         if (local->ops->tx_last_beacon)
1859                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1860         else
1861                 tx_last_beacon = 1;
1862
1863 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1864         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1865                " (tx_last_beacon=%d)\n",
1866                sdata->dev->name, mgmt->sa, mgmt->da,
1867                mgmt->bssid, tx_last_beacon);
1868 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1869
1870         if (!tx_last_beacon)
1871                 return;
1872
1873         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1874             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1875                 return;
1876
1877         end = ((u8 *) mgmt) + len;
1878         pos = mgmt->u.probe_req.variable;
1879         if (pos[0] != WLAN_EID_SSID ||
1880             pos + 2 + pos[1] > end) {
1881 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1882                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1883                        "from %pM\n",
1884                        sdata->dev->name, mgmt->sa);
1885 #endif
1886                 return;
1887         }
1888         if (pos[1] != 0 &&
1889             (pos[1] != ifsta->ssid_len ||
1890              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1891                 /* Ignore ProbeReq for foreign SSID */
1892                 return;
1893         }
1894
1895         /* Reply with ProbeResp */
1896         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1897         if (!skb)
1898                 return;
1899
1900         resp = (struct ieee80211_mgmt *) skb->data;
1901         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1902 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1903         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1904                sdata->dev->name, resp->da);
1905 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1906         ieee80211_tx_skb(sdata, skb, 0);
1907 }
1908
1909 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1910                            struct ieee80211_rx_status *rx_status)
1911 {
1912         struct ieee80211_local *local = sdata->local;
1913         struct ieee80211_if_sta *ifsta;
1914         struct ieee80211_mgmt *mgmt;
1915         u16 fc;
1916
1917         if (skb->len < 24)
1918                 goto fail;
1919
1920         ifsta = &sdata->u.sta;
1921
1922         mgmt = (struct ieee80211_mgmt *) skb->data;
1923         fc = le16_to_cpu(mgmt->frame_control);
1924
1925         switch (fc & IEEE80211_FCTL_STYPE) {
1926         case IEEE80211_STYPE_PROBE_REQ:
1927         case IEEE80211_STYPE_PROBE_RESP:
1928         case IEEE80211_STYPE_BEACON:
1929                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1930         case IEEE80211_STYPE_AUTH:
1931         case IEEE80211_STYPE_ASSOC_RESP:
1932         case IEEE80211_STYPE_REASSOC_RESP:
1933         case IEEE80211_STYPE_DEAUTH:
1934         case IEEE80211_STYPE_DISASSOC:
1935                 skb_queue_tail(&ifsta->skb_queue, skb);
1936                 queue_work(local->hw.workqueue, &ifsta->work);
1937                 return;
1938         }
1939
1940  fail:
1941         kfree_skb(skb);
1942 }
1943
1944 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1945                                          struct sk_buff *skb)
1946 {
1947         struct ieee80211_rx_status *rx_status;
1948         struct ieee80211_if_sta *ifsta;
1949         struct ieee80211_mgmt *mgmt;
1950         u16 fc;
1951
1952         ifsta = &sdata->u.sta;
1953
1954         rx_status = (struct ieee80211_rx_status *) skb->cb;
1955         mgmt = (struct ieee80211_mgmt *) skb->data;
1956         fc = le16_to_cpu(mgmt->frame_control);
1957
1958         switch (fc & IEEE80211_FCTL_STYPE) {
1959         case IEEE80211_STYPE_PROBE_REQ:
1960                 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len);
1961                 break;
1962         case IEEE80211_STYPE_PROBE_RESP:
1963                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1964                 break;
1965         case IEEE80211_STYPE_BEACON:
1966                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1967                 break;
1968         case IEEE80211_STYPE_AUTH:
1969                 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1970                 break;
1971         case IEEE80211_STYPE_ASSOC_RESP:
1972                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1973                 break;
1974         case IEEE80211_STYPE_REASSOC_RESP:
1975                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
1976                 break;
1977         case IEEE80211_STYPE_DEAUTH:
1978                 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
1979                 break;
1980         case IEEE80211_STYPE_DISASSOC:
1981                 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
1982                 break;
1983         }
1984
1985         kfree_skb(skb);
1986 }
1987
1988
1989 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
1990 {
1991         struct ieee80211_local *local = sdata->local;
1992         int active = 0;
1993         struct sta_info *sta;
1994
1995         rcu_read_lock();
1996
1997         list_for_each_entry_rcu(sta, &local->sta_list, list) {
1998                 if (sta->sdata == sdata &&
1999                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
2000                                jiffies)) {
2001                         active++;
2002                         break;
2003                 }
2004         }
2005
2006         rcu_read_unlock();
2007
2008         return active;
2009 }
2010
2011
2012 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
2013                                      struct ieee80211_if_sta *ifsta)
2014 {
2015         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2016
2017         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
2018         if (ieee80211_sta_active_ibss(sdata))
2019                 return;
2020
2021         if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
2022             (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
2023                 return;
2024
2025         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2026                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
2027         ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
2028 }
2029
2030
2031 static void ieee80211_sta_timer(unsigned long data)
2032 {
2033         struct ieee80211_sub_if_data *sdata =
2034                 (struct ieee80211_sub_if_data *) data;
2035         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2036         struct ieee80211_local *local = sdata->local;
2037
2038         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2039         queue_work(local->hw.workqueue, &ifsta->work);
2040 }
2041
2042 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
2043                                      struct ieee80211_if_sta *ifsta)
2044 {
2045         struct ieee80211_local *local = sdata->local;
2046
2047         if (local->ops->reset_tsf) {
2048                 /* Reset own TSF to allow time synchronization work. */
2049                 local->ops->reset_tsf(local_to_hw(local));
2050         }
2051
2052         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2053
2054
2055         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2056                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2057         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2058                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2059         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2060                 ifsta->auth_alg = WLAN_AUTH_LEAP;
2061         else
2062                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2063         ifsta->auth_transaction = -1;
2064         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2065         ifsta->assoc_scan_tries = 0;
2066         ifsta->direct_probe_tries = 0;
2067         ifsta->auth_tries = 0;
2068         ifsta->assoc_tries = 0;
2069         netif_tx_stop_all_queues(sdata->dev);
2070         netif_carrier_off(sdata->dev);
2071 }
2072
2073
2074 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2075                                     const char *ssid, int ssid_len)
2076 {
2077         int tmp, hidden_ssid;
2078
2079         if (ssid_len == ifsta->ssid_len &&
2080             !memcmp(ifsta->ssid, ssid, ssid_len))
2081                 return 1;
2082
2083         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2084                 return 0;
2085
2086         hidden_ssid = 1;
2087         tmp = ssid_len;
2088         while (tmp--) {
2089                 if (ssid[tmp] != '\0') {
2090                         hidden_ssid = 0;
2091                         break;
2092                 }
2093         }
2094
2095         if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
2096                 return 1;
2097
2098         if (ssid_len == 1 && ssid[0] == ' ')
2099                 return 1;
2100
2101         return 0;
2102 }
2103
2104 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2105                                      struct ieee80211_if_sta *ifsta)
2106 {
2107         struct ieee80211_local *local = sdata->local;
2108         struct ieee80211_bss *bss;
2109         struct ieee80211_supported_band *sband;
2110         u8 bssid[ETH_ALEN], *pos;
2111         int i;
2112         int ret;
2113
2114 #if 0
2115         /* Easier testing, use fixed BSSID. */
2116         memset(bssid, 0xfe, ETH_ALEN);
2117 #else
2118         /* Generate random, not broadcast, locally administered BSSID. Mix in
2119          * own MAC address to make sure that devices that do not have proper
2120          * random number generator get different BSSID. */
2121         get_random_bytes(bssid, ETH_ALEN);
2122         for (i = 0; i < ETH_ALEN; i++)
2123                 bssid[i] ^= sdata->dev->dev_addr[i];
2124         bssid[0] &= ~0x01;
2125         bssid[0] |= 0x02;
2126 #endif
2127
2128         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2129                sdata->dev->name, bssid);
2130
2131         bss = ieee80211_rx_bss_add(local, bssid,
2132                                    local->hw.conf.channel->center_freq,
2133                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2134         if (!bss)
2135                 return -ENOMEM;
2136
2137         bss->band = local->hw.conf.channel->band;
2138         sband = local->hw.wiphy->bands[bss->band];
2139
2140         if (local->hw.conf.beacon_int == 0)
2141                 local->hw.conf.beacon_int = 100;
2142         bss->beacon_int = local->hw.conf.beacon_int;
2143         bss->last_update = jiffies;
2144         bss->capability = WLAN_CAPABILITY_IBSS;
2145
2146         if (sdata->default_key)
2147                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2148         else
2149                 sdata->drop_unencrypted = 0;
2150
2151         bss->supp_rates_len = sband->n_bitrates;
2152         pos = bss->supp_rates;
2153         for (i = 0; i < sband->n_bitrates; i++) {
2154                 int rate = sband->bitrates[i].bitrate;
2155                 *pos++ = (u8) (rate / 5);
2156         }
2157
2158         ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2159         ieee80211_rx_bss_put(local, bss);
2160         return ret;
2161 }
2162
2163
2164 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2165                                    struct ieee80211_if_sta *ifsta)
2166 {
2167         struct ieee80211_local *local = sdata->local;
2168         struct ieee80211_bss *bss;
2169         int found = 0;
2170         u8 bssid[ETH_ALEN];
2171         int active_ibss;
2172
2173         if (ifsta->ssid_len == 0)
2174                 return -EINVAL;
2175
2176         active_ibss = ieee80211_sta_active_ibss(sdata);
2177 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2178         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2179                sdata->dev->name, active_ibss);
2180 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2181         spin_lock_bh(&local->bss_lock);
2182         list_for_each_entry(bss, &local->bss_list, list) {
2183                 if (ifsta->ssid_len != bss->ssid_len ||
2184                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2185                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2186                         continue;
2187 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2188                 printk(KERN_DEBUG "   bssid=%pM found\n", bss->bssid);
2189 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2190                 memcpy(bssid, bss->bssid, ETH_ALEN);
2191                 found = 1;
2192                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2193                         break;
2194         }
2195         spin_unlock_bh(&local->bss_lock);
2196
2197 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2198         if (found)
2199                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
2200                        "%pM\n", bssid, ifsta->bssid);
2201 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2202
2203         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2204                 int ret;
2205                 int search_freq;
2206
2207                 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2208                         search_freq = bss->freq;
2209                 else
2210                         search_freq = local->hw.conf.channel->center_freq;
2211
2212                 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2213                                            ifsta->ssid, ifsta->ssid_len);
2214                 if (!bss)
2215                         goto dont_join;
2216
2217                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2218                        " based on configured SSID\n",
2219                        sdata->dev->name, bssid);
2220                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2221                 ieee80211_rx_bss_put(local, bss);
2222                 return ret;
2223         }
2224
2225 dont_join:
2226 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2227         printk(KERN_DEBUG "   did not try to join ibss\n");
2228 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2229
2230         /* Selected IBSS not found in current scan results - try to scan */
2231         if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2232             !ieee80211_sta_active_ibss(sdata)) {
2233                 mod_timer(&ifsta->timer, jiffies +
2234                                       IEEE80211_IBSS_MERGE_INTERVAL);
2235         } else if (time_after(jiffies, local->last_scan_completed +
2236                               IEEE80211_SCAN_INTERVAL)) {
2237                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2238                        "join\n", sdata->dev->name);
2239                 return ieee80211_request_scan(sdata, ifsta->ssid,
2240                                               ifsta->ssid_len);
2241         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2242                 int interval = IEEE80211_SCAN_INTERVAL;
2243
2244                 if (time_after(jiffies, ifsta->ibss_join_req +
2245                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2246                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2247                             (!(local->oper_channel->flags &
2248                                         IEEE80211_CHAN_NO_IBSS)))
2249                                 return ieee80211_sta_create_ibss(sdata, ifsta);
2250                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2251                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
2252                                        " %d MHz\n", sdata->dev->name,
2253                                        local->hw.conf.channel->center_freq);
2254                         }
2255
2256                         /* No IBSS found - decrease scan interval and continue
2257                          * scanning. */
2258                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2259                 }
2260
2261                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2262                 mod_timer(&ifsta->timer, jiffies + interval);
2263                 return 0;
2264         }
2265
2266         return 0;
2267 }
2268
2269
2270 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2271                                      struct ieee80211_if_sta *ifsta)
2272 {
2273         struct ieee80211_local *local = sdata->local;
2274         struct ieee80211_bss *bss, *selected = NULL;
2275         int top_rssi = 0, freq;
2276
2277         spin_lock_bh(&local->bss_lock);
2278         freq = local->oper_channel->center_freq;
2279         list_for_each_entry(bss, &local->bss_list, list) {
2280                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2281                         continue;
2282
2283                 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2284                         IEEE80211_STA_AUTO_BSSID_SEL |
2285                         IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2286                     (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2287                      !!sdata->default_key))
2288                         continue;
2289
2290                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2291                     bss->freq != freq)
2292                         continue;
2293
2294                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2295                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2296                         continue;
2297
2298                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2299                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2300                         continue;
2301
2302                 if (!selected || top_rssi < bss->signal) {
2303                         selected = bss;
2304                         top_rssi = bss->signal;
2305                 }
2306         }
2307         if (selected)
2308                 atomic_inc(&selected->users);
2309         spin_unlock_bh(&local->bss_lock);
2310
2311         if (selected) {
2312                 ieee80211_set_freq(sdata, selected->freq);
2313                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2314                         ieee80211_sta_set_ssid(sdata, selected->ssid,
2315                                                selected->ssid_len);
2316                 ieee80211_sta_set_bssid(sdata, selected->bssid);
2317                 ieee80211_sta_def_wmm_params(sdata, selected);
2318
2319                 /* Send out direct probe if no probe resp was received or
2320                  * the one we have is outdated
2321                  */
2322                 if (!selected->last_probe_resp ||
2323                     time_after(jiffies, selected->last_probe_resp
2324                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2325                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2326                 else
2327                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2328
2329                 ieee80211_rx_bss_put(local, selected);
2330                 ieee80211_sta_reset_auth(sdata, ifsta);
2331                 return 0;
2332         } else {
2333                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2334                         ifsta->assoc_scan_tries++;
2335                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2336                                 ieee80211_start_scan(sdata, NULL, 0);
2337                         else
2338                                 ieee80211_start_scan(sdata, ifsta->ssid,
2339                                                          ifsta->ssid_len);
2340                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2341                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2342                 } else
2343                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
2344         }
2345         return -1;
2346 }
2347
2348
2349 static void ieee80211_sta_work(struct work_struct *work)
2350 {
2351         struct ieee80211_sub_if_data *sdata =
2352                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2353         struct ieee80211_local *local = sdata->local;
2354         struct ieee80211_if_sta *ifsta;
2355         struct sk_buff *skb;
2356
2357         if (!netif_running(sdata->dev))
2358                 return;
2359
2360         if (local->sw_scanning || local->hw_scanning)
2361                 return;
2362
2363         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2364                     sdata->vif.type != NL80211_IFTYPE_ADHOC))
2365                 return;
2366         ifsta = &sdata->u.sta;
2367
2368         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2369                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2370
2371         if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2372             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2373             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2374             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2375                 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2376                                      ifsta->scan_ssid_len);
2377                 return;
2378         }
2379
2380         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2381                 if (ieee80211_sta_config_auth(sdata, ifsta))
2382                         return;
2383                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2384         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2385                 return;
2386
2387         switch (ifsta->state) {
2388         case IEEE80211_STA_MLME_DISABLED:
2389                 break;
2390         case IEEE80211_STA_MLME_DIRECT_PROBE:
2391                 ieee80211_direct_probe(sdata, ifsta);
2392                 break;
2393         case IEEE80211_STA_MLME_AUTHENTICATE:
2394                 ieee80211_authenticate(sdata, ifsta);
2395                 break;
2396         case IEEE80211_STA_MLME_ASSOCIATE:
2397                 ieee80211_associate(sdata, ifsta);
2398                 break;
2399         case IEEE80211_STA_MLME_ASSOCIATED:
2400                 ieee80211_associated(sdata, ifsta);
2401                 break;
2402         case IEEE80211_STA_MLME_IBSS_SEARCH:
2403                 ieee80211_sta_find_ibss(sdata, ifsta);
2404                 break;
2405         case IEEE80211_STA_MLME_IBSS_JOINED:
2406                 ieee80211_sta_merge_ibss(sdata, ifsta);
2407                 break;
2408         default:
2409                 WARN_ON(1);
2410                 break;
2411         }
2412
2413         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2414                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2415                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2416
2417                 ieee80211_set_disassoc(sdata, ifsta, false, true,
2418                                         WLAN_REASON_UNSPECIFIED);
2419         }
2420 }
2421
2422 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2423 {
2424         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2425                 queue_work(sdata->local->hw.workqueue,
2426                            &sdata->u.sta.work);
2427 }
2428
2429 /* interface setup */
2430 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2431 {
2432         struct ieee80211_if_sta *ifsta;
2433
2434         ifsta = &sdata->u.sta;
2435         INIT_WORK(&ifsta->work, ieee80211_sta_work);
2436         INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
2437         setup_timer(&ifsta->timer, ieee80211_sta_timer,
2438                     (unsigned long) sdata);
2439         setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
2440                     (unsigned long) sdata);
2441         skb_queue_head_init(&ifsta->skb_queue);
2442
2443         ifsta->capab = WLAN_CAPABILITY_ESS;
2444         ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2445                 IEEE80211_AUTH_ALG_SHARED_KEY;
2446         ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2447                 IEEE80211_STA_AUTO_BSSID_SEL |
2448                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2449         if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2450                 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2451 }
2452
2453 /*
2454  * Add a new IBSS station, will also be called by the RX code when,
2455  * in IBSS mode, receiving a frame from a yet-unknown station, hence
2456  * must be callable in atomic context.
2457  */
2458 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2459                                         u8 *bssid,u8 *addr, u64 supp_rates)
2460 {
2461         struct ieee80211_local *local = sdata->local;
2462         struct sta_info *sta;
2463         int band = local->hw.conf.channel->band;
2464
2465         /* TODO: Could consider removing the least recently used entry and
2466          * allow new one to be added. */
2467         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2468                 if (net_ratelimit()) {
2469                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2470                                "entry %pM\n", sdata->dev->name, addr);
2471                 }
2472                 return NULL;
2473         }
2474
2475         if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2476                 return NULL;
2477
2478 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2479         printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2480                wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2481 #endif
2482
2483         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2484         if (!sta)
2485                 return NULL;
2486
2487         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2488
2489         /* make sure mandatory rates are always added */
2490         sta->sta.supp_rates[band] = supp_rates |
2491                         ieee80211_mandatory_rates(local, band);
2492
2493         rate_control_rate_init(sta);
2494
2495         if (sta_info_insert(sta))
2496                 return NULL;
2497
2498         return sta;
2499 }
2500
2501 /* configuration hooks */
2502 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2503                             struct ieee80211_if_sta *ifsta)
2504 {
2505         struct ieee80211_local *local = sdata->local;
2506
2507         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2508                 return;
2509
2510         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2511                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2512             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2513                              IEEE80211_STA_AUTO_SSID_SEL))) {
2514
2515                 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2516                         ieee80211_set_disassoc(sdata, ifsta, true, true,
2517                                                WLAN_REASON_DEAUTH_LEAVING);
2518
2519                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2520                 queue_work(local->hw.workqueue, &ifsta->work);
2521         }
2522 }
2523
2524 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2525 {
2526         struct ieee80211_if_sta *ifsta;
2527
2528         if (len > IEEE80211_MAX_SSID_LEN)
2529                 return -EINVAL;
2530
2531         ifsta = &sdata->u.sta;
2532
2533         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2534                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2535                 memcpy(ifsta->ssid, ssid, len);
2536                 ifsta->ssid_len = len;
2537                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2538         }
2539
2540         if (len)
2541                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2542         else
2543                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2544
2545         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2546             !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2547                 ifsta->ibss_join_req = jiffies;
2548                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2549                 return ieee80211_sta_find_ibss(sdata, ifsta);
2550         }
2551
2552         return 0;
2553 }
2554
2555 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2556 {
2557         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2558         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2559         *len = ifsta->ssid_len;
2560         return 0;
2561 }
2562
2563 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2564 {
2565         struct ieee80211_if_sta *ifsta;
2566         int res;
2567         bool valid;
2568
2569         ifsta = &sdata->u.sta;
2570         valid = is_valid_ether_addr(bssid);
2571
2572         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2573                 if(valid)
2574                         memcpy(ifsta->bssid, bssid, ETH_ALEN);
2575                 else
2576                         memset(ifsta->bssid, 0, ETH_ALEN);
2577                 res = 0;
2578                 /*
2579                  * Hack! See also ieee80211_sta_set_ssid.
2580                  */
2581                 if (netif_running(sdata->dev))
2582                         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2583                 if (res) {
2584                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2585                                "the low-level driver\n", sdata->dev->name);
2586                         return res;
2587                 }
2588         }
2589
2590         if (valid)
2591                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2592         else
2593                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2594
2595         return 0;
2596 }
2597
2598 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2599 {
2600         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2601
2602         kfree(ifsta->extra_ie);
2603         if (len == 0) {
2604                 ifsta->extra_ie = NULL;
2605                 ifsta->extra_ie_len = 0;
2606                 return 0;
2607         }
2608         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2609         if (!ifsta->extra_ie) {
2610                 ifsta->extra_ie_len = 0;
2611                 return -ENOMEM;
2612         }
2613         memcpy(ifsta->extra_ie, ie, len);
2614         ifsta->extra_ie_len = len;
2615         return 0;
2616 }
2617
2618 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2619 {
2620         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2621
2622         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2623                sdata->dev->name, reason);
2624
2625         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2626             sdata->vif.type != NL80211_IFTYPE_ADHOC)
2627                 return -EINVAL;
2628
2629         ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2630         return 0;
2631 }
2632
2633 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2634 {
2635         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2636
2637         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2638                sdata->dev->name, reason);
2639
2640         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2641                 return -EINVAL;
2642
2643         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2644                 return -1;
2645
2646         ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2647         return 0;
2648 }
2649
2650 /* scan finished notification */
2651 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2652 {
2653         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2654         struct ieee80211_if_sta *ifsta;
2655
2656         if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2657                 ifsta = &sdata->u.sta;
2658                 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2659                     (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2660                     !ieee80211_sta_active_ibss(sdata)))
2661                         ieee80211_sta_find_ibss(sdata, ifsta);
2662         }
2663
2664         /* Restart STA timers */
2665         rcu_read_lock();
2666         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2667                 ieee80211_restart_sta_timer(sdata);
2668         rcu_read_unlock();
2669 }
2670
2671 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2672 {
2673         struct ieee80211_local *local =
2674                 container_of(work, struct ieee80211_local,
2675                              dynamic_ps_disable_work);
2676
2677         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2678                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2679                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2680         }
2681
2682         ieee80211_wake_queues_by_reason(&local->hw,
2683                                         IEEE80211_QUEUE_STOP_REASON_PS);
2684 }
2685
2686 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2687 {
2688         struct ieee80211_local *local =
2689                 container_of(work, struct ieee80211_local,
2690                              dynamic_ps_enable_work);
2691         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2692
2693         if (local->hw.conf.flags & IEEE80211_CONF_PS)
2694                 return;
2695
2696         ieee80211_send_nullfunc(local, sdata, 1);
2697         local->hw.conf.flags |= IEEE80211_CONF_PS;
2698
2699         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2700 }
2701
2702 void ieee80211_dynamic_ps_timer(unsigned long data)
2703 {
2704         struct ieee80211_local *local = (void *) data;
2705
2706         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2707 }