net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <net/mac80211.h>
  21 #include <asm/unaligned.h>
  22
  23 #include "ieee80211_i.h"
  24 #include "rate.h"
  25 #include "led.h"
  26
  27 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
  28 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  29 #define IEEE80211_AUTH_MAX_TRIES 3
  30 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  31 #define IEEE80211_ASSOC_MAX_TRIES 3
  32 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  33 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
  34 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  35
  36 /* utils */
  37 static int ecw2cw(int ecw)
  38 {
  39         return (1 << ecw) - 1;
  40 }
  41
  42 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  43 {
  44         u8 *end, *pos;
  45
  46         pos = bss->cbss.information_elements;
  47         if (pos == NULL)
  48                 return NULL;
  49         end = pos + bss->cbss.len_information_elements;
  50
  51         while (pos + 1 < end) {
  52                 if (pos + 2 + pos[1] > end)
  53                         break;
  54                 if (pos[0] == ie)
  55                         return pos;
  56                 pos += 2 + pos[1];
  57         }
  58
  59         return NULL;
  60 }
  61
  62 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  63                                       struct ieee80211_supported_band *sband,
  64                                       u32 *rates)
  65 {
  66         int i, j, count;
  67         *rates = 0;
  68         count = 0;
  69         for (i = 0; i < bss->supp_rates_len; i++) {
  70                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  71
  72                 for (j = 0; j < sband->n_bitrates; j++)
  73                         if (sband->bitrates[j].bitrate == rate) {
  74                                 *rates |= BIT(j);
  75                                 count++;
  76                                 break;
  77                         }
  78         }
  79
  80         return count;
  81 }
  82
  83 /* frame sending functions */
  84
  85 static void add_extra_ies(struct sk_buff *skb, u8 *ies, size_t ies_len)
  86 {
  87         if (ies)
  88                 memcpy(skb_put(skb, ies_len), ies, ies_len);
  89 }
  90
  91 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
  92 {
  93         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  94         struct ieee80211_local *local = sdata->local;
  95         struct sk_buff *skb;
  96         struct ieee80211_mgmt *mgmt;
  97         u8 *pos, *ies, *ht_ie, *e_ies;
  98         int i, len, count, rates_len, supp_rates_len;
  99         u16 capab;
 100         struct ieee80211_bss *bss;
 101         int wmm = 0;
 102         struct ieee80211_supported_band *sband;
 103         u32 rates = 0;
 104         size_t e_ies_len;
 105
 106         if (ifmgd->flags & IEEE80211_IBSS_PREV_BSSID_SET) {
 107                 e_ies = sdata->u.mgd.ie_reassocreq;
 108                 e_ies_len = sdata->u.mgd.ie_reassocreq_len;
 109         } else {
 110                 e_ies = sdata->u.mgd.ie_assocreq;
 111                 e_ies_len = sdata->u.mgd.ie_assocreq_len;
 112         }
 113
 114         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 115                             sizeof(*mgmt) + 200 + ifmgd->extra_ie_len +
 116                             ifmgd->ssid_len + e_ies_len);
 117         if (!skb) {
 118                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 119                        "frame\n", sdata->dev->name);
 120                 return;
 121         }
 122         skb_reserve(skb, local->hw.extra_tx_headroom);
 123
 124         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 125
 126         capab = ifmgd->capab;
 127
 128         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 129                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 130                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 131                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 132                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 133         }
 134
 135         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 136                                    local->hw.conf.channel->center_freq,
 137                                    ifmgd->ssid, ifmgd->ssid_len);
 138         if (bss) {
 139                 if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
 140                         capab |= WLAN_CAPABILITY_PRIVACY;
 141                 if (bss->wmm_used)
 142                         wmm = 1;
 143
 144                 /* get all rates supported by the device and the AP as
 145                  * some APs don't like getting a superset of their rates
 146                  * in the association request (e.g. D-Link DAP 1353 in
 147                  * b-only mode) */
 148                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 149
 150                 if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 151                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 152                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 153
 154                 ieee80211_rx_bss_put(local, bss);
 155         } else {
 156                 rates = ~0;
 157                 rates_len = sband->n_bitrates;
 158         }
 159
 160         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 161         memset(mgmt, 0, 24);
 162         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 163         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 164         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 165
 166         if (ifmgd->flags & IEEE80211_STA_PREV_BSSID_SET) {
 167                 skb_put(skb, 10);
 168                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 169                                                   IEEE80211_STYPE_REASSOC_REQ);
 170                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 171                 mgmt->u.reassoc_req.listen_interval =
 172                                 cpu_to_le16(local->hw.conf.listen_interval);
 173                 memcpy(mgmt->u.reassoc_req.current_ap, ifmgd->prev_bssid,
 174                        ETH_ALEN);
 175         } else {
 176                 skb_put(skb, 4);
 177                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 178                                                   IEEE80211_STYPE_ASSOC_REQ);
 179                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 180                 mgmt->u.assoc_req.listen_interval =
 181                                 cpu_to_le16(local->hw.conf.listen_interval);
 182         }
 183
 184         /* SSID */
 185         ies = pos = skb_put(skb, 2 + ifmgd->ssid_len);
 186         *pos++ = WLAN_EID_SSID;
 187         *pos++ = ifmgd->ssid_len;
 188         memcpy(pos, ifmgd->ssid, ifmgd->ssid_len);
 189
 190         /* add all rates which were marked to be used above */
 191         supp_rates_len = rates_len;
 192         if (supp_rates_len > 8)
 193                 supp_rates_len = 8;
 194
 195         len = sband->n_bitrates;
 196         pos = skb_put(skb, supp_rates_len + 2);
 197         *pos++ = WLAN_EID_SUPP_RATES;
 198         *pos++ = supp_rates_len;
 199
 200         count = 0;
 201         for (i = 0; i < sband->n_bitrates; i++) {
 202                 if (BIT(i) & rates) {
 203                         int rate = sband->bitrates[i].bitrate;
 204                         *pos++ = (u8) (rate / 5);
 205                         if (++count == 8)
 206                                 break;
 207                 }
 208         }
 209
 210         if (rates_len > count) {
 211                 pos = skb_put(skb, rates_len - count + 2);
 212                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 213                 *pos++ = rates_len - count;
 214
 215                 for (i++; i < sband->n_bitrates; i++) {
 216                         if (BIT(i) & rates) {
 217                                 int rate = sband->bitrates[i].bitrate;
 218                                 *pos++ = (u8) (rate / 5);
 219                         }
 220                 }
 221         }
 222
 223         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 224                 /* 1. power capabilities */
 225                 pos = skb_put(skb, 4);
 226                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 227                 *pos++ = 2;
 228                 *pos++ = 0; /* min tx power */
 229                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 230
 231                 /* 2. supported channels */
 232                 /* TODO: get this in reg domain format */
 233                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 234                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 235                 *pos++ = 2 * sband->n_channels;
 236                 for (i = 0; i < sband->n_channels; i++) {
 237                         *pos++ = ieee80211_frequency_to_channel(
 238                                         sband->channels[i].center_freq);
 239                         *pos++ = 1; /* one channel in the subband*/
 240                 }
 241         }
 242
 243         if (ifmgd->extra_ie) {
 244                 pos = skb_put(skb, ifmgd->extra_ie_len);
 245                 memcpy(pos, ifmgd->extra_ie, ifmgd->extra_ie_len);
 246         }
 247
 248         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
 249                 pos = skb_put(skb, 9);
 250                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 251                 *pos++ = 7; /* len */
 252                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 253                 *pos++ = 0x50;
 254                 *pos++ = 0xf2;
 255                 *pos++ = 2; /* WME */
 256                 *pos++ = 0; /* WME info */
 257                 *pos++ = 1; /* WME ver */
 258                 *pos++ = 0;
 259         }
 260
 261         /* wmm support is a must to HT */
 262         /*
 263          * IEEE802.11n does not allow TKIP/WEP as pairwise
 264          * ciphers in HT mode. We still associate in non-ht
 265          * mode (11a/b/g) if any one of these ciphers is
 266          * configured as pairwise.
 267          */
 268         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
 269             sband->ht_cap.ht_supported &&
 270             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
 271             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 272             (!(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))) {
 273                 struct ieee80211_ht_info *ht_info =
 274                         (struct ieee80211_ht_info *)(ht_ie + 2);
 275                 u16 cap = sband->ht_cap.cap;
 276                 __le16 tmp;
 277                 u32 flags = local->hw.conf.channel->flags;
 278
 279                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 280                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 281                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 282                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 283                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 284                         }
 285                         break;
 286                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 287                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 288                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 289                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 290                         }
 291                         break;
 292                 }
 293
 294                 tmp = cpu_to_le16(cap);
 295                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 296                 *pos++ = WLAN_EID_HT_CAPABILITY;
 297                 *pos++ = sizeof(struct ieee80211_ht_cap);
 298                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 299                 memcpy(pos, &tmp, sizeof(u16));
 300                 pos += sizeof(u16);
 301                 /* TODO: needs a define here for << 2 */
 302                 *pos++ = sband->ht_cap.ampdu_factor |
 303                          (sband->ht_cap.ampdu_density << 2);
 304                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 305         }
 306
 307         add_extra_ies(skb, e_ies, e_ies_len);
 308
 309         kfree(ifmgd->assocreq_ies);
 310         ifmgd->assocreq_ies_len = (skb->data + skb->len) - ies;
 311         ifmgd->assocreq_ies = kmalloc(ifmgd->assocreq_ies_len, GFP_KERNEL);
 312         if (ifmgd->assocreq_ies)
 313                 memcpy(ifmgd->assocreq_ies, ies, ifmgd->assocreq_ies_len);
 314
 315         ieee80211_tx_skb(sdata, skb, 0);
 316 }
 317
 318
 319 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 320                                            u16 stype, u16 reason)
 321 {
 322         struct ieee80211_local *local = sdata->local;
 323         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 324         struct sk_buff *skb;
 325         struct ieee80211_mgmt *mgmt;
 326         u8 *ies;
 327         size_t ies_len;
 328
 329         if (stype == IEEE80211_STYPE_DEAUTH) {
 330                 ies = sdata->u.mgd.ie_deauth;
 331                 ies_len = sdata->u.mgd.ie_deauth_len;
 332         } else {
 333                 ies = sdata->u.mgd.ie_disassoc;
 334                 ies_len = sdata->u.mgd.ie_disassoc_len;
 335         }
 336
 337         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) +
 338                             ies_len);
 339         if (!skb) {
 340                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 341                        "deauth/disassoc frame\n", sdata->dev->name);
 342                 return;
 343         }
 344         skb_reserve(skb, local->hw.extra_tx_headroom);
 345
 346         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 347         memset(mgmt, 0, 24);
 348         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 349         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 350         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 351         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 352         skb_put(skb, 2);
 353         /* u.deauth.reason_code == u.disassoc.reason_code */
 354         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 355
 356         add_extra_ies(skb, ies, ies_len);
 357
 358         ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
 359 }
 360
 361 void ieee80211_send_pspoll(struct ieee80211_local *local,
 362                            struct ieee80211_sub_if_data *sdata)
 363 {
 364         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 365         struct ieee80211_pspoll *pspoll;
 366         struct sk_buff *skb;
 367         u16 fc;
 368
 369         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 370         if (!skb) {
 371                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 372                        "pspoll frame\n", sdata->dev->name);
 373                 return;
 374         }
 375         skb_reserve(skb, local->hw.extra_tx_headroom);
 376
 377         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 378         memset(pspoll, 0, sizeof(*pspoll));
 379         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 380         pspoll->frame_control = cpu_to_le16(fc);
 381         pspoll->aid = cpu_to_le16(ifmgd->aid);
 382
 383         /* aid in PS-Poll has its two MSBs each set to 1 */
 384         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 385
 386         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
 387         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
 388
 389         ieee80211_tx_skb(sdata, skb, 0);
 390 }
 391
 392 /* MLME */
 393 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 394                                      struct ieee80211_if_managed *ifmgd,
 395                                      u8 *wmm_param, size_t wmm_param_len)
 396 {
 397         struct ieee80211_tx_queue_params params;
 398         size_t left;
 399         int count;
 400         u8 *pos;
 401
 402         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
 403                 return;
 404
 405         if (!wmm_param)
 406                 return;
 407
 408         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 409                 return;
 410         count = wmm_param[6] & 0x0f;
 411         if (count == ifmgd->wmm_last_param_set)
 412                 return;
 413         ifmgd->wmm_last_param_set = count;
 414
 415         pos = wmm_param + 8;
 416         left = wmm_param_len - 8;
 417
 418         memset(&params, 0, sizeof(params));
 419
 420         if (!local->ops->conf_tx)
 421                 return;
 422
 423         local->wmm_acm = 0;
 424         for (; left >= 4; left -= 4, pos += 4) {
 425                 int aci = (pos[0] >> 5) & 0x03;
 426                 int acm = (pos[0] >> 4) & 0x01;
 427                 int queue;
 428
 429                 switch (aci) {
 430                 case 1:
 431                         queue = 3;
 432                         if (acm)
 433                                 local->wmm_acm |= BIT(0) | BIT(3);
 434                         break;
 435                 case 2:
 436                         queue = 1;
 437                         if (acm)
 438                                 local->wmm_acm |= BIT(4) | BIT(5);
 439                         break;
 440                 case 3:
 441                         queue = 0;
 442                         if (acm)
 443                                 local->wmm_acm |= BIT(6) | BIT(7);
 444                         break;
 445                 case 0:
 446                 default:
 447                         queue = 2;
 448                         if (acm)
 449                                 local->wmm_acm |= BIT(1) | BIT(2);
 450                         break;
 451                 }
 452
 453                 params.aifs = pos[0] & 0x0f;
 454                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 455                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 456                 params.txop = get_unaligned_le16(pos + 2);
 457 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 458                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 459                        "cWmin=%d cWmax=%d txop=%d\n",
 460                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 461                        params.cw_max, params.txop);
 462 #endif
 463                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
 464                  * AC for now) */
 465                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 466                         printk(KERN_DEBUG "%s: failed to set TX queue "
 467                                "parameters for queue %d\n", local->mdev->name, queue);
 468                 }
 469         }
 470 }
 471
 472 static bool ieee80211_check_tim(struct ieee802_11_elems *elems, u16 aid)
 473 {
 474         u8 mask;
 475         u8 index, indexn1, indexn2;
 476         struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
 477
 478         aid &= 0x3fff;
 479         index = aid / 8;
 480         mask  = 1 << (aid & 7);
 481
 482         indexn1 = tim->bitmap_ctrl & 0xfe;
 483         indexn2 = elems->tim_len + indexn1 - 4;
 484
 485         if (index < indexn1 || index > indexn2)
 486                 return false;
 487
 488         index -= indexn1;
 489
 490         return !!(tim->virtual_map[index] & mask);
 491 }
 492
 493 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 494                                            u16 capab, bool erp_valid, u8 erp)
 495 {
 496         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 497 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 498         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 499 #endif
 500         u32 changed = 0;
 501         bool use_protection;
 502         bool use_short_preamble;
 503         bool use_short_slot;
 504
 505         if (erp_valid) {
 506                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 507                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 508         } else {
 509                 use_protection = false;
 510                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 511         }
 512
 513         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 514
 515         if (use_protection != bss_conf->use_cts_prot) {
 516 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 517                 if (net_ratelimit()) {
 518                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 519                                sdata->dev->name,
 520                                use_protection ? "enabled" : "disabled",
 521                                ifmgd->bssid);
 522                 }
 523 #endif
 524                 bss_conf->use_cts_prot = use_protection;
 525                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 526         }
 527
 528         if (use_short_preamble != bss_conf->use_short_preamble) {
 529 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 530                 if (net_ratelimit()) {
 531                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 532                                " (BSSID=%pM)\n",
 533                                sdata->dev->name,
 534                                use_short_preamble ? "short" : "long",
 535                                ifmgd->bssid);
 536                 }
 537 #endif
 538                 bss_conf->use_short_preamble = use_short_preamble;
 539                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 540         }
 541
 542         if (use_short_slot != bss_conf->use_short_slot) {
 543 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 544                 if (net_ratelimit()) {
 545                         printk(KERN_DEBUG "%s: switched to %s slot time"
 546                                " (BSSID=%pM)\n",
 547                                sdata->dev->name,
 548                                use_short_slot ? "short" : "long",
 549                                ifmgd->bssid);
 550                 }
 551 #endif
 552                 bss_conf->use_short_slot = use_short_slot;
 553                 changed |= BSS_CHANGED_ERP_SLOT;
 554         }
 555
 556         return changed;
 557 }
 558
 559 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata)
 560 {
 561         union iwreq_data wrqu;
 562
 563         memset(&wrqu, 0, sizeof(wrqu));
 564         if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED)
 565                 memcpy(wrqu.ap_addr.sa_data, sdata->u.mgd.bssid, ETH_ALEN);
 566         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 567         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 568 }
 569
 570 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata)
 571 {
 572         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 573         char *buf;
 574         size_t len;
 575         int i;
 576         union iwreq_data wrqu;
 577
 578         if (!ifmgd->assocreq_ies && !ifmgd->assocresp_ies)
 579                 return;
 580
 581         buf = kmalloc(50 + 2 * (ifmgd->assocreq_ies_len +
 582                                 ifmgd->assocresp_ies_len), GFP_KERNEL);
 583         if (!buf)
 584                 return;
 585
 586         len = sprintf(buf, "ASSOCINFO(");
 587         if (ifmgd->assocreq_ies) {
 588                 len += sprintf(buf + len, "ReqIEs=");
 589                 for (i = 0; i < ifmgd->assocreq_ies_len; i++) {
 590                         len += sprintf(buf + len, "%02x",
 591                                        ifmgd->assocreq_ies[i]);
 592                 }
 593         }
 594         if (ifmgd->assocresp_ies) {
 595                 if (ifmgd->assocreq_ies)
 596                         len += sprintf(buf + len, " ");
 597                 len += sprintf(buf + len, "RespIEs=");
 598                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 599                         len += sprintf(buf + len, "%02x",
 600                                        ifmgd->assocresp_ies[i]);
 601                 }
 602         }
 603         len += sprintf(buf + len, ")");
 604
 605         if (len > IW_CUSTOM_MAX) {
 606                 len = sprintf(buf, "ASSOCRESPIE=");
 607                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 608                         len += sprintf(buf + len, "%02x",
 609                                        ifmgd->assocresp_ies[i]);
 610                 }
 611         }
 612
 613         if (len <= IW_CUSTOM_MAX) {
 614                 memset(&wrqu, 0, sizeof(wrqu));
 615                 wrqu.data.length = len;
 616                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 617         }
 618
 619         kfree(buf);
 620 }
 621
 622
 623 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 624                                      u32 bss_info_changed)
 625 {
 626         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 627         struct ieee80211_local *local = sdata->local;
 628         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 629
 630         struct ieee80211_bss *bss;
 631
 632         bss_info_changed |= BSS_CHANGED_ASSOC;
 633         ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
 634
 635         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 636                                    conf->channel->center_freq,
 637                                    ifmgd->ssid, ifmgd->ssid_len);
 638         if (bss) {
 639                 /* set timing information */
 640                 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 641                 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 642                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 643
 644                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 645                         bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 646
 647                 ieee80211_rx_bss_put(local, bss);
 648         }
 649
 650         ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
 651         memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
 652         ieee80211_sta_send_associnfo(sdata);
 653
 654         ifmgd->last_probe = jiffies;
 655         ieee80211_led_assoc(local, 1);
 656
 657         sdata->vif.bss_conf.assoc = 1;
 658         /*
 659          * For now just always ask the driver to update the basic rateset
 660          * when we have associated, we aren't checking whether it actually
 661          * changed or not.
 662          */
 663         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 664         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 665
 666         if (local->powersave) {
 667                 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
 668                     local->hw.conf.dynamic_ps_timeout > 0) {
 669                         mod_timer(&local->dynamic_ps_timer, jiffies +
 670                                   msecs_to_jiffies(
 671                                         local->hw.conf.dynamic_ps_timeout));
 672                 } else {
 673                         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 674                                 ieee80211_send_nullfunc(local, sdata, 1);
 675                         conf->flags |= IEEE80211_CONF_PS;
 676                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 677                 }
 678         }
 679
 680         netif_tx_start_all_queues(sdata->dev);
 681         netif_carrier_on(sdata->dev);
 682
 683         ieee80211_sta_send_apinfo(sdata);
 684 }
 685
 686 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
 687 {
 688         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 689
 690         ifmgd->direct_probe_tries++;
 691         if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 692                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 693                        sdata->dev->name, ifmgd->bssid);
 694                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 695                 ieee80211_sta_send_apinfo(sdata);
 696
 697                 /*
 698                  * Most likely AP is not in the range so remove the
 699                  * bss information associated to the AP
 700                  */
 701                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 702                                 sdata->local->hw.conf.channel->center_freq,
 703                                 ifmgd->ssid, ifmgd->ssid_len);
 704                 return;
 705         }
 706
 707         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 708                         sdata->dev->name, ifmgd->bssid,
 709                         ifmgd->direct_probe_tries);
 710
 711         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 712
 713         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifmgd->request);
 714
 715         /* Direct probe is sent to broadcast address as some APs
 716          * will not answer to direct packet in unassociated state.
 717          */
 718         ieee80211_send_probe_req(sdata, NULL,
 719                                  ifmgd->ssid, ifmgd->ssid_len);
 720
 721         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 722 }
 723
 724
 725 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
 726 {
 727         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 728
 729         ifmgd->auth_tries++;
 730         if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 731                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 732                        " timed out\n",
 733                        sdata->dev->name, ifmgd->bssid);
 734                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 735                 ieee80211_sta_send_apinfo(sdata);
 736                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 737                                 sdata->local->hw.conf.channel->center_freq,
 738                                 ifmgd->ssid, ifmgd->ssid_len);
 739                 return;
 740         }
 741
 742         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
 743         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 744                sdata->dev->name, ifmgd->bssid);
 745
 746         ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, NULL, 0,
 747                             ifmgd->bssid, 0);
 748         ifmgd->auth_transaction = 2;
 749
 750         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 751 }
 752
 753 /*
 754  * The disassoc 'reason' argument can be either our own reason
 755  * if self disconnected or a reason code from the AP.
 756  */
 757 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 758                                    bool deauth, bool self_disconnected,
 759                                    u16 reason)
 760 {
 761         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 762         struct ieee80211_local *local = sdata->local;
 763         struct sta_info *sta;
 764         u32 changed = 0, config_changed = 0;
 765
 766         rcu_read_lock();
 767
 768         sta = sta_info_get(local, ifmgd->bssid);
 769         if (!sta) {
 770                 rcu_read_unlock();
 771                 return;
 772         }
 773
 774         if (deauth) {
 775                 ifmgd->direct_probe_tries = 0;
 776                 ifmgd->auth_tries = 0;
 777         }
 778         ifmgd->assoc_scan_tries = 0;
 779         ifmgd->assoc_tries = 0;
 780
 781         netif_tx_stop_all_queues(sdata->dev);
 782         netif_carrier_off(sdata->dev);
 783
 784         ieee80211_sta_tear_down_BA_sessions(sta);
 785
 786         if (self_disconnected) {
 787                 if (deauth)
 788                         ieee80211_send_deauth_disassoc(sdata,
 789                                 IEEE80211_STYPE_DEAUTH, reason);
 790                 else
 791                         ieee80211_send_deauth_disassoc(sdata,
 792                                 IEEE80211_STYPE_DISASSOC, reason);
 793         }
 794
 795         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
 796         changed |= ieee80211_reset_erp_info(sdata);
 797
 798         ieee80211_led_assoc(local, 0);
 799         changed |= BSS_CHANGED_ASSOC;
 800         sdata->vif.bss_conf.assoc = false;
 801
 802         ieee80211_sta_send_apinfo(sdata);
 803
 804         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
 805                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 806                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 807                                 sdata->local->hw.conf.channel->center_freq,
 808                                 ifmgd->ssid, ifmgd->ssid_len);
 809         }
 810
 811         rcu_read_unlock();
 812
 813         /* channel(_type) changes are handled by ieee80211_hw_config */
 814         local->oper_channel_type = NL80211_CHAN_NO_HT;
 815
 816         local->power_constr_level = 0;
 817
 818         del_timer_sync(&local->dynamic_ps_timer);
 819         cancel_work_sync(&local->dynamic_ps_enable_work);
 820
 821         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 822                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 823                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 824         }
 825
 826         ieee80211_hw_config(local, config_changed);
 827         ieee80211_bss_info_change_notify(sdata, changed);
 828
 829         rcu_read_lock();
 830
 831         sta = sta_info_get(local, ifmgd->bssid);
 832         if (!sta) {
 833                 rcu_read_unlock();
 834                 return;
 835         }
 836
 837         sta_info_unlink(&sta);
 838
 839         rcu_read_unlock();
 840
 841         sta_info_destroy(sta);
 842 }
 843
 844 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
 845 {
 846         if (!sdata || !sdata->default_key ||
 847             sdata->default_key->conf.alg != ALG_WEP)
 848                 return 0;
 849         return 1;
 850 }
 851
 852 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
 853 {
 854         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 855         struct ieee80211_local *local = sdata->local;
 856         struct ieee80211_bss *bss;
 857         int bss_privacy;
 858         int wep_privacy;
 859         int privacy_invoked;
 860
 861         if (!ifmgd || (ifmgd->flags & IEEE80211_STA_MIXED_CELL))
 862                 return 0;
 863
 864         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 865                                    local->hw.conf.channel->center_freq,
 866                                    ifmgd->ssid, ifmgd->ssid_len);
 867         if (!bss)
 868                 return 0;
 869
 870         bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
 871         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
 872         privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
 873
 874         ieee80211_rx_bss_put(local, bss);
 875
 876         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
 877                 return 0;
 878
 879         return 1;
 880 }
 881
 882 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
 883 {
 884         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 885
 886         ifmgd->assoc_tries++;
 887         if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 888                 printk(KERN_DEBUG "%s: association with AP %pM"
 889                        " timed out\n",
 890                        sdata->dev->name, ifmgd->bssid);
 891                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 892                 ieee80211_sta_send_apinfo(sdata);
 893                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 894                                 sdata->local->hw.conf.channel->center_freq,
 895                                 ifmgd->ssid, ifmgd->ssid_len);
 896                 return;
 897         }
 898
 899         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
 900         printk(KERN_DEBUG "%s: associate with AP %pM\n",
 901                sdata->dev->name, ifmgd->bssid);
 902         if (ieee80211_privacy_mismatch(sdata)) {
 903                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 904                        "mixed-cell disabled - abort association\n", sdata->dev->name);
 905                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 906                 return;
 907         }
 908
 909         ieee80211_send_assoc(sdata);
 910
 911         mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 912 }
 913
 914
 915 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
 916 {
 917         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 918         struct ieee80211_local *local = sdata->local;
 919         struct sta_info *sta;
 920         int disassoc;
 921
 922         /* TODO: start monitoring current AP signal quality and number of
 923          * missed beacons. Scan other channels every now and then and search
 924          * for better APs. */
 925         /* TODO: remove expired BSSes */
 926
 927         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
 928
 929         rcu_read_lock();
 930
 931         sta = sta_info_get(local, ifmgd->bssid);
 932         if (!sta) {
 933                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
 934                        sdata->dev->name, ifmgd->bssid);
 935                 disassoc = 1;
 936         } else {
 937                 disassoc = 0;
 938                 if (time_after(jiffies,
 939                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 940                         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
 941                                 printk(KERN_DEBUG "%s: No ProbeResp from "
 942                                        "current AP %pM - assume out of "
 943                                        "range\n",
 944                                        sdata->dev->name, ifmgd->bssid);
 945                                 disassoc = 1;
 946                         } else
 947                                 ieee80211_send_probe_req(sdata, ifmgd->bssid,
 948                                                          ifmgd->ssid,
 949                                                          ifmgd->ssid_len);
 950                         ifmgd->flags ^= IEEE80211_STA_PROBEREQ_POLL;
 951                 } else {
 952                         ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
 953                         if (time_after(jiffies, ifmgd->last_probe +
 954                                        IEEE80211_PROBE_INTERVAL)) {
 955                                 ifmgd->last_probe = jiffies;
 956                                 ieee80211_send_probe_req(sdata, ifmgd->bssid,
 957                                                          ifmgd->ssid,
 958                                                          ifmgd->ssid_len);
 959                         }
 960                 }
 961         }
 962
 963         rcu_read_unlock();
 964
 965         if (disassoc)
 966                 ieee80211_set_disassoc(sdata, true, true,
 967                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
 968         else
 969                 mod_timer(&ifmgd->timer, jiffies +
 970                                       IEEE80211_MONITORING_INTERVAL);
 971 }
 972
 973
 974 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
 975 {
 976         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 977
 978         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
 979         ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
 980         ieee80211_associate(sdata);
 981 }
 982
 983
 984 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
 985                                      struct ieee80211_mgmt *mgmt,
 986                                      size_t len)
 987 {
 988         u8 *pos;
 989         struct ieee802_11_elems elems;
 990
 991         pos = mgmt->u.auth.variable;
 992         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
 993         if (!elems.challenge)
 994                 return;
 995         ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
 996                             elems.challenge - 2, elems.challenge_len + 2,
 997                             sdata->u.mgd.bssid, 1);
 998         sdata->u.mgd.auth_transaction = 4;
 999 }
1000
1001 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1002                                    struct ieee80211_mgmt *mgmt,
1003                                    size_t len)
1004 {
1005         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1006         u16 auth_alg, auth_transaction, status_code;
1007
1008         if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1009                 return;
1010
1011         if (len < 24 + 6)
1012                 return;
1013
1014         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1015                 return;
1016
1017         if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1018                 return;
1019
1020         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1021         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1022         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1023
1024         if (auth_alg != ifmgd->auth_alg ||
1025             auth_transaction != ifmgd->auth_transaction)
1026                 return;
1027
1028         if (status_code != WLAN_STATUS_SUCCESS) {
1029                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1030                         u8 algs[3];
1031                         const int num_algs = ARRAY_SIZE(algs);
1032                         int i, pos;
1033                         algs[0] = algs[1] = algs[2] = 0xff;
1034                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1035                                 algs[0] = WLAN_AUTH_OPEN;
1036                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1037                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1038                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1039                                 algs[2] = WLAN_AUTH_LEAP;
1040                         if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1041                                 pos = 0;
1042                         else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1043                                 pos = 1;
1044                         else
1045                                 pos = 2;
1046                         for (i = 0; i < num_algs; i++) {
1047                                 pos++;
1048                                 if (pos >= num_algs)
1049                                         pos = 0;
1050                                 if (algs[pos] == ifmgd->auth_alg ||
1051                                     algs[pos] == 0xff)
1052                                         continue;
1053                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1054                                     !ieee80211_sta_wep_configured(sdata))
1055                                         continue;
1056                                 ifmgd->auth_alg = algs[pos];
1057                                 break;
1058                         }
1059                 }
1060                 return;
1061         }
1062
1063         switch (ifmgd->auth_alg) {
1064         case WLAN_AUTH_OPEN:
1065         case WLAN_AUTH_LEAP:
1066                 ieee80211_auth_completed(sdata);
1067                 break;
1068         case WLAN_AUTH_SHARED_KEY:
1069                 if (ifmgd->auth_transaction == 4)
1070                         ieee80211_auth_completed(sdata);
1071                 else
1072                         ieee80211_auth_challenge(sdata, mgmt, len);
1073                 break;
1074         }
1075 }
1076
1077
1078 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1079                                      struct ieee80211_mgmt *mgmt,
1080                                      size_t len)
1081 {
1082         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1083         u16 reason_code;
1084
1085         if (len < 24 + 2)
1086                 return;
1087
1088         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1089                 return;
1090
1091         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1092
1093         if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1094                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1095                                 sdata->dev->name, reason_code);
1096
1097         if (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1098             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1099             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1100                 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1101                 mod_timer(&ifmgd->timer, jiffies +
1102                                       IEEE80211_RETRY_AUTH_INTERVAL);
1103         }
1104
1105         ieee80211_set_disassoc(sdata, true, false, 0);
1106         ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1107 }
1108
1109
1110 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1111                                        struct ieee80211_mgmt *mgmt,
1112                                        size_t len)
1113 {
1114         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1115         u16 reason_code;
1116
1117         if (len < 24 + 2)
1118                 return;
1119
1120         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1121                 return;
1122
1123         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1124
1125         if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1126                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1127                                 sdata->dev->name, reason_code);
1128
1129         if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1130                 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1131                 mod_timer(&ifmgd->timer, jiffies +
1132                                       IEEE80211_RETRY_AUTH_INTERVAL);
1133         }
1134
1135         ieee80211_set_disassoc(sdata, false, false, reason_code);
1136 }
1137
1138
1139 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1140                                          struct ieee80211_mgmt *mgmt,
1141                                          size_t len,
1142                                          int reassoc)
1143 {
1144         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1145         struct ieee80211_local *local = sdata->local;
1146         struct ieee80211_supported_band *sband;
1147         struct sta_info *sta;
1148         u32 rates, basic_rates;
1149         u16 capab_info, status_code, aid;
1150         struct ieee802_11_elems elems;
1151         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1152         u8 *pos;
1153         u32 changed = 0;
1154         int i, j;
1155         bool have_higher_than_11mbit = false, newsta = false;
1156         u16 ap_ht_cap_flags;
1157
1158         /* AssocResp and ReassocResp have identical structure, so process both
1159          * of them in this function. */
1160
1161         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1162                 return;
1163
1164         if (len < 24 + 6)
1165                 return;
1166
1167         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1168                 return;
1169
1170         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1171         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1172         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1173
1174         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1175                "status=%d aid=%d)\n",
1176                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1177                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1178
1179         pos = mgmt->u.assoc_resp.variable;
1180         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1181
1182         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1183             elems.timeout_int && elems.timeout_int_len == 5 &&
1184             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1185                 u32 tu, ms;
1186                 tu = get_unaligned_le32(elems.timeout_int + 1);
1187                 ms = tu * 1024 / 1000;
1188                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1189                        "comeback duration %u TU (%u ms)\n",
1190                        sdata->dev->name, tu, ms);
1191                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1192                         mod_timer(&ifmgd->timer,
1193                                   jiffies + msecs_to_jiffies(ms));
1194                 return;
1195         }
1196
1197         if (status_code != WLAN_STATUS_SUCCESS) {
1198                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1199                        sdata->dev->name, status_code);
1200                 /* if this was a reassociation, ensure we try a "full"
1201                  * association next time. This works around some broken APs
1202                  * which do not correctly reject reassociation requests. */
1203                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1204                 return;
1205         }
1206
1207         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1208                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1209                        "set\n", sdata->dev->name, aid);
1210         aid &= ~(BIT(15) | BIT(14));
1211
1212         if (!elems.supp_rates) {
1213                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1214                        sdata->dev->name);
1215                 return;
1216         }
1217
1218         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1219         ifmgd->aid = aid;
1220         ifmgd->ap_capab = capab_info;
1221
1222         kfree(ifmgd->assocresp_ies);
1223         ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1224         ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1225         if (ifmgd->assocresp_ies)
1226                 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1227
1228         rcu_read_lock();
1229
1230         /* Add STA entry for the AP */
1231         sta = sta_info_get(local, ifmgd->bssid);
1232         if (!sta) {
1233                 newsta = true;
1234
1235                 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1236                 if (!sta) {
1237                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1238                                " the AP\n", sdata->dev->name);
1239                         rcu_read_unlock();
1240                         return;
1241                 }
1242
1243                 /* update new sta with its last rx activity */
1244                 sta->last_rx = jiffies;
1245         }
1246
1247         /*
1248          * FIXME: Do we really need to update the sta_info's information here?
1249          *        We already know about the AP (we found it in our list) so it
1250          *        should already be filled with the right info, no?
1251          *        As is stands, all this is racy because typically we assume
1252          *        the information that is filled in here (except flags) doesn't
1253          *        change while a STA structure is alive. As such, it should move
1254          *        to between the sta_info_alloc() and sta_info_insert() above.
1255          */
1256
1257         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1258                            WLAN_STA_AUTHORIZED);
1259
1260         rates = 0;
1261         basic_rates = 0;
1262         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1263
1264         for (i = 0; i < elems.supp_rates_len; i++) {
1265                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1266                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1267
1268                 if (rate > 110)
1269                         have_higher_than_11mbit = true;
1270
1271                 for (j = 0; j < sband->n_bitrates; j++) {
1272                         if (sband->bitrates[j].bitrate == rate) {
1273                                 rates |= BIT(j);
1274                                 if (is_basic)
1275                                         basic_rates |= BIT(j);
1276                                 break;
1277                         }
1278                 }
1279         }
1280
1281         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1282                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1283                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1284
1285                 if (rate > 110)
1286                         have_higher_than_11mbit = true;
1287
1288                 for (j = 0; j < sband->n_bitrates; j++) {
1289                         if (sband->bitrates[j].bitrate == rate) {
1290                                 rates |= BIT(j);
1291                                 if (is_basic)
1292                                         basic_rates |= BIT(j);
1293                                 break;
1294                         }
1295                 }
1296         }
1297
1298         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1299         sdata->vif.bss_conf.basic_rates = basic_rates;
1300
1301         /* cf. IEEE 802.11 9.2.12 */
1302         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1303             have_higher_than_11mbit)
1304                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1305         else
1306                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1307
1308         if (elems.ht_cap_elem)
1309                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1310                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1311
1312         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1313
1314         rate_control_rate_init(sta);
1315
1316         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1317                 set_sta_flags(sta, WLAN_STA_MFP);
1318
1319         if (elems.wmm_param)
1320                 set_sta_flags(sta, WLAN_STA_WME);
1321
1322         if (newsta) {
1323                 int err = sta_info_insert(sta);
1324                 if (err) {
1325                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1326                                " the AP (error %d)\n", sdata->dev->name, err);
1327                         rcu_read_unlock();
1328                         return;
1329                 }
1330         }
1331
1332         rcu_read_unlock();
1333
1334         if (elems.wmm_param)
1335                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1336                                          elems.wmm_param_len);
1337
1338         if (elems.ht_info_elem && elems.wmm_param &&
1339             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1340             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1341                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1342                                                ap_ht_cap_flags);
1343
1344         /* set AID and assoc capability,
1345          * ieee80211_set_associated() will tell the driver */
1346         bss_conf->aid = aid;
1347         bss_conf->assoc_capability = capab_info;
1348         ieee80211_set_associated(sdata, changed);
1349
1350         ieee80211_associated(sdata);
1351 }
1352
1353
1354 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1355                                   struct ieee80211_mgmt *mgmt,
1356                                   size_t len,
1357                                   struct ieee80211_rx_status *rx_status,
1358                                   struct ieee802_11_elems *elems,
1359                                   bool beacon)
1360 {
1361         struct ieee80211_local *local = sdata->local;
1362         int freq;
1363         struct ieee80211_bss *bss;
1364         struct ieee80211_channel *channel;
1365
1366         if (elems->ds_params && elems->ds_params_len == 1)
1367                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1368         else
1369                 freq = rx_status->freq;
1370
1371         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1372
1373         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1374                 return;
1375
1376         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1377                                         channel, beacon);
1378         if (!bss)
1379                 return;
1380
1381         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1382             (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1383                 struct ieee80211_channel_sw_ie *sw_elem =
1384                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1385                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1386         }
1387
1388         ieee80211_rx_bss_put(local, bss);
1389 }
1390
1391
1392 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1393                                          struct ieee80211_mgmt *mgmt,
1394                                          size_t len,
1395                                          struct ieee80211_rx_status *rx_status)
1396 {
1397         size_t baselen;
1398         struct ieee802_11_elems elems;
1399
1400         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1401                 return; /* ignore ProbeResp to foreign address */
1402
1403         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1404         if (baselen > len)
1405                 return;
1406
1407         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1408                                 &elems);
1409
1410         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1411
1412         /* direct probe may be part of the association flow */
1413         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1414             &sdata->u.mgd.request)) {
1415                 printk(KERN_DEBUG "%s direct probe responded\n",
1416                        sdata->dev->name);
1417                 ieee80211_authenticate(sdata);
1418         }
1419 }
1420
1421 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1422                                      struct ieee80211_mgmt *mgmt,
1423                                      size_t len,
1424                                      struct ieee80211_rx_status *rx_status)
1425 {
1426         struct ieee80211_if_managed *ifmgd;
1427         size_t baselen;
1428         struct ieee802_11_elems elems;
1429         struct ieee80211_local *local = sdata->local;
1430         u32 changed = 0;
1431         bool erp_valid, directed_tim;
1432         u8 erp_value = 0;
1433
1434         /* Process beacon from the current BSS */
1435         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1436         if (baselen > len)
1437                 return;
1438
1439         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1440
1441         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1442
1443         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1444                 return;
1445
1446         ifmgd = &sdata->u.mgd;
1447
1448         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1449             memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1450                 return;
1451
1452         if (rx_status->freq != local->hw.conf.channel->center_freq)
1453                 return;
1454
1455         ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1456                                  elems.wmm_param_len);
1457
1458         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK &&
1459             local->hw.conf.flags & IEEE80211_CONF_PS) {
1460                 directed_tim = ieee80211_check_tim(&elems, ifmgd->aid);
1461
1462                 if (directed_tim) {
1463                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1464                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1465                                 ieee80211_hw_config(local,
1466                                                     IEEE80211_CONF_CHANGE_PS);
1467                                 ieee80211_send_nullfunc(local, sdata, 0);
1468                         } else {
1469                                 local->pspolling = true;
1470
1471                                 /*
1472                                  * Here is assumed that the driver will be
1473                                  * able to send ps-poll frame and receive a
1474                                  * response even though power save mode is
1475                                  * enabled, but some drivers might require
1476                                  * to disable power save here. This needs
1477                                  * to be investigated.
1478                                  */
1479                                 ieee80211_send_pspoll(local, sdata);
1480                         }
1481                 }
1482         }
1483
1484         if (elems.erp_info && elems.erp_info_len >= 1) {
1485                 erp_valid = true;
1486                 erp_value = elems.erp_info[0];
1487         } else {
1488                 erp_valid = false;
1489         }
1490         changed |= ieee80211_handle_bss_capability(sdata,
1491                         le16_to_cpu(mgmt->u.beacon.capab_info),
1492                         erp_valid, erp_value);
1493
1494
1495         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1496             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
1497                 struct sta_info *sta;
1498                 struct ieee80211_supported_band *sband;
1499                 u16 ap_ht_cap_flags;
1500
1501                 rcu_read_lock();
1502
1503                 sta = sta_info_get(local, ifmgd->bssid);
1504                 if (!sta) {
1505                         rcu_read_unlock();
1506                         return;
1507                 }
1508
1509                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1510
1511                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1512                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1513
1514                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1515
1516                 rcu_read_unlock();
1517
1518                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1519                                                ap_ht_cap_flags);
1520         }
1521
1522         if (elems.country_elem) {
1523                 /* Note we are only reviewing this on beacons
1524                  * for the BSSID we are associated to */
1525                 regulatory_hint_11d(local->hw.wiphy,
1526                         elems.country_elem, elems.country_elem_len);
1527
1528                 /* TODO: IBSS also needs this */
1529                 if (elems.pwr_constr_elem)
1530                         ieee80211_handle_pwr_constr(sdata,
1531                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1532                                 elems.pwr_constr_elem,
1533                                 elems.pwr_constr_elem_len);
1534         }
1535
1536         ieee80211_bss_info_change_notify(sdata, changed);
1537 }
1538
1539 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1540                                           struct sk_buff *skb,
1541                                           struct ieee80211_rx_status *rx_status)
1542 {
1543         struct ieee80211_local *local = sdata->local;
1544         struct ieee80211_mgmt *mgmt;
1545         u16 fc;
1546
1547         if (skb->len < 24)
1548                 return RX_DROP_MONITOR;
1549
1550         mgmt = (struct ieee80211_mgmt *) skb->data;
1551         fc = le16_to_cpu(mgmt->frame_control);
1552
1553         switch (fc & IEEE80211_FCTL_STYPE) {
1554         case IEEE80211_STYPE_PROBE_REQ:
1555         case IEEE80211_STYPE_PROBE_RESP:
1556         case IEEE80211_STYPE_BEACON:
1557                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1558         case IEEE80211_STYPE_AUTH:
1559         case IEEE80211_STYPE_ASSOC_RESP:
1560         case IEEE80211_STYPE_REASSOC_RESP:
1561         case IEEE80211_STYPE_DEAUTH:
1562         case IEEE80211_STYPE_DISASSOC:
1563                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1564                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1565                 return RX_QUEUED;
1566         }
1567
1568         return RX_DROP_MONITOR;
1569 }
1570
1571 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1572                                          struct sk_buff *skb)
1573 {
1574         struct ieee80211_rx_status *rx_status;
1575         struct ieee80211_mgmt *mgmt;
1576         u16 fc;
1577
1578         rx_status = (struct ieee80211_rx_status *) skb->cb;
1579         mgmt = (struct ieee80211_mgmt *) skb->data;
1580         fc = le16_to_cpu(mgmt->frame_control);
1581
1582         switch (fc & IEEE80211_FCTL_STYPE) {
1583         case IEEE80211_STYPE_PROBE_RESP:
1584                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
1585                                              rx_status);
1586                 break;
1587         case IEEE80211_STYPE_BEACON:
1588                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1589                                          rx_status);
1590                 break;
1591         case IEEE80211_STYPE_AUTH:
1592                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
1593                 break;
1594         case IEEE80211_STYPE_ASSOC_RESP:
1595                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
1596                 break;
1597         case IEEE80211_STYPE_REASSOC_RESP:
1598                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
1599                 break;
1600         case IEEE80211_STYPE_DEAUTH:
1601                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1602                 break;
1603         case IEEE80211_STYPE_DISASSOC:
1604                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1605                 break;
1606         }
1607
1608         kfree_skb(skb);
1609 }
1610
1611 static void ieee80211_sta_timer(unsigned long data)
1612 {
1613         struct ieee80211_sub_if_data *sdata =
1614                 (struct ieee80211_sub_if_data *) data;
1615         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1616         struct ieee80211_local *local = sdata->local;
1617
1618         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1619         queue_work(local->hw.workqueue, &ifmgd->work);
1620 }
1621
1622 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
1623 {
1624         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1625         struct ieee80211_local *local = sdata->local;
1626
1627         if (local->ops->reset_tsf) {
1628                 /* Reset own TSF to allow time synchronization work. */
1629                 local->ops->reset_tsf(local_to_hw(local));
1630         }
1631
1632         ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
1633
1634
1635         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1636                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1637         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1638                 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
1639         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1640                 ifmgd->auth_alg = WLAN_AUTH_LEAP;
1641         else
1642                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1643         ifmgd->auth_transaction = -1;
1644         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1645         ifmgd->assoc_scan_tries = 0;
1646         ifmgd->direct_probe_tries = 0;
1647         ifmgd->auth_tries = 0;
1648         ifmgd->assoc_tries = 0;
1649         netif_tx_stop_all_queues(sdata->dev);
1650         netif_carrier_off(sdata->dev);
1651 }
1652
1653 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
1654 {
1655         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1656         struct ieee80211_local *local = sdata->local;
1657         struct ieee80211_bss *bss;
1658         u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
1659         u8 ssid_len = ifmgd->ssid_len;
1660         u16 capa_mask = WLAN_CAPABILITY_ESS;
1661         u16 capa_val = WLAN_CAPABILITY_ESS;
1662         struct ieee80211_channel *chan = local->oper_channel;
1663
1664         if (ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
1665                             IEEE80211_STA_AUTO_BSSID_SEL |
1666                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
1667                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
1668                 if (sdata->default_key)
1669                         capa_val |= WLAN_CAPABILITY_PRIVACY;
1670         }
1671
1672         if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
1673                 chan = NULL;
1674
1675         if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1676                 bssid = NULL;
1677
1678         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
1679                 ssid = NULL;
1680                 ssid_len = 0;
1681         }
1682
1683         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
1684                                        bssid, ssid, ssid_len,
1685                                        capa_mask, capa_val);
1686
1687         if (bss) {
1688                 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
1689                 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
1690                         ieee80211_sta_set_ssid(sdata, bss->ssid,
1691                                                bss->ssid_len);
1692                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
1693                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
1694                                                     bss->supp_rates);
1695                 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
1696                         sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
1697                 else
1698                         sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
1699
1700                 /* Send out direct probe if no probe resp was received or
1701                  * the one we have is outdated
1702                  */
1703                 if (!bss->last_probe_resp ||
1704                     time_after(jiffies, bss->last_probe_resp
1705                                         + IEEE80211_SCAN_RESULT_EXPIRE))
1706                         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1707                 else
1708                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1709
1710                 ieee80211_rx_bss_put(local, bss);
1711                 ieee80211_sta_reset_auth(sdata);
1712                 return 0;
1713         } else {
1714                 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
1715                         ifmgd->assoc_scan_tries++;
1716                         /* XXX maybe racy? */
1717                         if (local->scan_req)
1718                                 return -1;
1719                         memcpy(local->int_scan_req.ssids[0].ssid,
1720                                ifmgd->ssid, IEEE80211_MAX_SSID_LEN);
1721                         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL)
1722                                 local->int_scan_req.ssids[0].ssid_len = 0;
1723                         else
1724                                 local->int_scan_req.ssids[0].ssid_len = ifmgd->ssid_len;
1725                         ieee80211_start_scan(sdata, &local->int_scan_req);
1726                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1727                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
1728                 } else {
1729                         ifmgd->assoc_scan_tries = 0;
1730                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1731                 }
1732         }
1733         return -1;
1734 }
1735
1736
1737 static void ieee80211_sta_work(struct work_struct *work)
1738 {
1739         struct ieee80211_sub_if_data *sdata =
1740                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1741         struct ieee80211_local *local = sdata->local;
1742         struct ieee80211_if_managed *ifmgd;
1743         struct sk_buff *skb;
1744
1745         if (!netif_running(sdata->dev))
1746                 return;
1747
1748         if (local->sw_scanning || local->hw_scanning)
1749                 return;
1750
1751         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1752                 return;
1753         ifmgd = &sdata->u.mgd;
1754
1755         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1756                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1757
1758         if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
1759             ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1760             ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
1761             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
1762                 ieee80211_start_scan(sdata, local->scan_req);
1763                 return;
1764         }
1765
1766         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
1767                 if (ieee80211_sta_config_auth(sdata))
1768                         return;
1769                 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1770         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
1771                 return;
1772
1773         switch (ifmgd->state) {
1774         case IEEE80211_STA_MLME_DISABLED:
1775                 break;
1776         case IEEE80211_STA_MLME_DIRECT_PROBE:
1777                 ieee80211_direct_probe(sdata);
1778                 break;
1779         case IEEE80211_STA_MLME_AUTHENTICATE:
1780                 ieee80211_authenticate(sdata);
1781                 break;
1782         case IEEE80211_STA_MLME_ASSOCIATE:
1783                 ieee80211_associate(sdata);
1784                 break;
1785         case IEEE80211_STA_MLME_ASSOCIATED:
1786                 ieee80211_associated(sdata);
1787                 break;
1788         default:
1789                 WARN_ON(1);
1790                 break;
1791         }
1792
1793         if (ieee80211_privacy_mismatch(sdata)) {
1794                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
1795                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
1796
1797                 ieee80211_set_disassoc(sdata, false, true,
1798                                         WLAN_REASON_UNSPECIFIED);
1799         }
1800 }
1801
1802 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1803 {
1804         if (sdata->vif.type == NL80211_IFTYPE_STATION)
1805                 queue_work(sdata->local->hw.workqueue,
1806                            &sdata->u.mgd.work);
1807 }
1808
1809 /* interface setup */
1810 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1811 {
1812         struct ieee80211_if_managed *ifmgd;
1813
1814         ifmgd = &sdata->u.mgd;
1815         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1816         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1817         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1818                     (unsigned long) sdata);
1819         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1820                     (unsigned long) sdata);
1821         skb_queue_head_init(&ifmgd->skb_queue);
1822
1823         ifmgd->capab = WLAN_CAPABILITY_ESS;
1824         ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
1825                 IEEE80211_AUTH_ALG_SHARED_KEY;
1826         ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
1827                 IEEE80211_STA_AUTO_BSSID_SEL |
1828                 IEEE80211_STA_AUTO_CHANNEL_SEL;
1829         if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
1830                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
1831 }
1832
1833 /* configuration hooks */
1834 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
1835 {
1836         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1837         struct ieee80211_local *local = sdata->local;
1838
1839         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1840                 return;
1841
1842         if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
1843                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
1844             (ifmgd->flags & (IEEE80211_STA_SSID_SET |
1845                              IEEE80211_STA_AUTO_SSID_SEL))) {
1846
1847                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
1848                         ieee80211_set_disassoc(sdata, true, true,
1849                                                WLAN_REASON_DEAUTH_LEAVING);
1850
1851                 set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
1852                 queue_work(local->hw.workqueue, &ifmgd->work);
1853         }
1854 }
1855
1856 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
1857 {
1858         struct ieee80211_if_managed *ifmgd;
1859
1860         if (len > IEEE80211_MAX_SSID_LEN)
1861                 return -EINVAL;
1862
1863         ifmgd = &sdata->u.mgd;
1864
1865         if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
1866                 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
1867                 memcpy(ifmgd->ssid, ssid, len);
1868                 ifmgd->ssid_len = len;
1869         }
1870
1871         ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1872
1873         if (len)
1874                 ifmgd->flags |= IEEE80211_STA_SSID_SET;
1875         else
1876                 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
1877
1878         return 0;
1879 }
1880
1881 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
1882 {
1883         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1884         memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
1885         *len = ifmgd->ssid_len;
1886         return 0;
1887 }
1888
1889 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
1890 {
1891         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1892
1893         if (is_valid_ether_addr(bssid)) {
1894                 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
1895                 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
1896         } else {
1897                 memset(ifmgd->bssid, 0, ETH_ALEN);
1898                 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
1899         }
1900
1901         if (netif_running(sdata->dev)) {
1902                 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
1903                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
1904                                "the low-level driver\n", sdata->dev->name);
1905                 }
1906         }
1907
1908         return ieee80211_sta_set_ssid(sdata, ifmgd->ssid, ifmgd->ssid_len);
1909 }
1910
1911 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
1912 {
1913         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1914
1915         kfree(ifmgd->extra_ie);
1916         if (len == 0) {
1917                 ifmgd->extra_ie = NULL;
1918                 ifmgd->extra_ie_len = 0;
1919                 return 0;
1920         }
1921         ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
1922         if (!ifmgd->extra_ie) {
1923                 ifmgd->extra_ie_len = 0;
1924                 return -ENOMEM;
1925         }
1926         memcpy(ifmgd->extra_ie, ie, len);
1927         ifmgd->extra_ie_len = len;
1928         return 0;
1929 }
1930
1931 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
1932 {
1933         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
1934                sdata->dev->name, reason);
1935
1936         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1937                 return -EINVAL;
1938
1939         ieee80211_set_disassoc(sdata, true, true, reason);
1940         return 0;
1941 }
1942
1943 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
1944 {
1945         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1946
1947         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
1948                sdata->dev->name, reason);
1949
1950         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1951                 return -EINVAL;
1952
1953         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
1954                 return -ENOLINK;
1955
1956         ieee80211_set_disassoc(sdata, false, true, reason);
1957         return 0;
1958 }
1959
1960 /* scan finished notification */
1961 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1962 {
1963         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1964
1965         /* Restart STA timers */
1966         rcu_read_lock();
1967         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1968                 ieee80211_restart_sta_timer(sdata);
1969         rcu_read_unlock();
1970 }
1971
1972 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1973 {
1974         struct ieee80211_local *local =
1975                 container_of(work, struct ieee80211_local,
1976                              dynamic_ps_disable_work);
1977
1978         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1979                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1980                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1981         }
1982
1983         ieee80211_wake_queues_by_reason(&local->hw,
1984                                         IEEE80211_QUEUE_STOP_REASON_PS);
1985 }
1986
1987 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1988 {
1989         struct ieee80211_local *local =
1990                 container_of(work, struct ieee80211_local,
1991                              dynamic_ps_enable_work);
1992         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1993
1994         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1995                 return;
1996
1997         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1998                 ieee80211_send_nullfunc(local, sdata, 1);
1999
2000         local->hw.conf.flags |= IEEE80211_CONF_PS;
2001         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2002 }
2003
2004 void ieee80211_dynamic_ps_timer(unsigned long data)
2005 {
2006         struct ieee80211_local *local = (void *) data;
2007
2008         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2009 }
2010
2011 void ieee80211_send_nullfunc(struct ieee80211_local *local,
2012                              struct ieee80211_sub_if_data *sdata,
2013                              int powersave)
2014 {
2015         struct sk_buff *skb;
2016         struct ieee80211_hdr *nullfunc;
2017         __le16 fc;
2018
2019         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2020                 return;
2021
2022         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
2023         if (!skb) {
2024                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2025                        "frame\n", sdata->dev->name);
2026                 return;
2027         }
2028         skb_reserve(skb, local->hw.extra_tx_headroom);
2029
2030         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
2031         memset(nullfunc, 0, 24);
2032         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
2033                          IEEE80211_FCTL_TODS);
2034         if (powersave)
2035                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
2036         nullfunc->frame_control = fc;
2037         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2038         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
2039         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2040
2041         ieee80211_tx_skb(sdata, skb, 0);
2042 }