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_STA_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         local->wmm_acm = 0;
 421         for (; left >= 4; left -= 4, pos += 4) {
 422                 int aci = (pos[0] >> 5) & 0x03;
 423                 int acm = (pos[0] >> 4) & 0x01;
 424                 int queue;
 425
 426                 switch (aci) {
 427                 case 1: /* AC_BK */
 428                         queue = 3;
 429                         if (acm)
 430                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 431                         break;
 432                 case 2: /* AC_VI */
 433                         queue = 1;
 434                         if (acm)
 435                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 436                         break;
 437                 case 3: /* AC_VO */
 438                         queue = 0;
 439                         if (acm)
 440                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 441                         break;
 442                 case 0: /* AC_BE */
 443                 default:
 444                         queue = 2;
 445                         if (acm)
 446                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 447                         break;
 448                 }
 449
 450                 params.aifs = pos[0] & 0x0f;
 451                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 452                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 453                 params.txop = get_unaligned_le16(pos + 2);
 454 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 455                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 456                        "cWmin=%d cWmax=%d txop=%d\n",
 457                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 458                        params.cw_max, params.txop);
 459 #endif
 460                 if (local->ops->conf_tx &&
 461                     local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 462                         printk(KERN_DEBUG "%s: failed to set TX queue "
 463                                "parameters for queue %d\n", local->mdev->name, queue);
 464                 }
 465         }
 466 }
 467
 468 static bool ieee80211_check_tim(struct ieee802_11_elems *elems, u16 aid)
 469 {
 470         u8 mask;
 471         u8 index, indexn1, indexn2;
 472         struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
 473
 474         aid &= 0x3fff;
 475         index = aid / 8;
 476         mask  = 1 << (aid & 7);
 477
 478         indexn1 = tim->bitmap_ctrl & 0xfe;
 479         indexn2 = elems->tim_len + indexn1 - 4;
 480
 481         if (index < indexn1 || index > indexn2)
 482                 return false;
 483
 484         index -= indexn1;
 485
 486         return !!(tim->virtual_map[index] & mask);
 487 }
 488
 489 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 490                                            u16 capab, bool erp_valid, u8 erp)
 491 {
 492         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 493 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 494         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 495 #endif
 496         u32 changed = 0;
 497         bool use_protection;
 498         bool use_short_preamble;
 499         bool use_short_slot;
 500
 501         if (erp_valid) {
 502                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 503                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 504         } else {
 505                 use_protection = false;
 506                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 507         }
 508
 509         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 510
 511         if (use_protection != bss_conf->use_cts_prot) {
 512 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 513                 if (net_ratelimit()) {
 514                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 515                                sdata->dev->name,
 516                                use_protection ? "enabled" : "disabled",
 517                                ifmgd->bssid);
 518                 }
 519 #endif
 520                 bss_conf->use_cts_prot = use_protection;
 521                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 522         }
 523
 524         if (use_short_preamble != bss_conf->use_short_preamble) {
 525 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 526                 if (net_ratelimit()) {
 527                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 528                                " (BSSID=%pM)\n",
 529                                sdata->dev->name,
 530                                use_short_preamble ? "short" : "long",
 531                                ifmgd->bssid);
 532                 }
 533 #endif
 534                 bss_conf->use_short_preamble = use_short_preamble;
 535                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 536         }
 537
 538         if (use_short_slot != bss_conf->use_short_slot) {
 539 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 540                 if (net_ratelimit()) {
 541                         printk(KERN_DEBUG "%s: switched to %s slot time"
 542                                " (BSSID=%pM)\n",
 543                                sdata->dev->name,
 544                                use_short_slot ? "short" : "long",
 545                                ifmgd->bssid);
 546                 }
 547 #endif
 548                 bss_conf->use_short_slot = use_short_slot;
 549                 changed |= BSS_CHANGED_ERP_SLOT;
 550         }
 551
 552         return changed;
 553 }
 554
 555 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata)
 556 {
 557         union iwreq_data wrqu;
 558
 559         memset(&wrqu, 0, sizeof(wrqu));
 560         if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED)
 561                 memcpy(wrqu.ap_addr.sa_data, sdata->u.mgd.bssid, ETH_ALEN);
 562         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 563         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 564 }
 565
 566 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata)
 567 {
 568         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 569         char *buf;
 570         size_t len;
 571         int i;
 572         union iwreq_data wrqu;
 573
 574         if (!ifmgd->assocreq_ies && !ifmgd->assocresp_ies)
 575                 return;
 576
 577         buf = kmalloc(50 + 2 * (ifmgd->assocreq_ies_len +
 578                                 ifmgd->assocresp_ies_len), GFP_KERNEL);
 579         if (!buf)
 580                 return;
 581
 582         len = sprintf(buf, "ASSOCINFO(");
 583         if (ifmgd->assocreq_ies) {
 584                 len += sprintf(buf + len, "ReqIEs=");
 585                 for (i = 0; i < ifmgd->assocreq_ies_len; i++) {
 586                         len += sprintf(buf + len, "%02x",
 587                                        ifmgd->assocreq_ies[i]);
 588                 }
 589         }
 590         if (ifmgd->assocresp_ies) {
 591                 if (ifmgd->assocreq_ies)
 592                         len += sprintf(buf + len, " ");
 593                 len += sprintf(buf + len, "RespIEs=");
 594                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 595                         len += sprintf(buf + len, "%02x",
 596                                        ifmgd->assocresp_ies[i]);
 597                 }
 598         }
 599         len += sprintf(buf + len, ")");
 600
 601         if (len > IW_CUSTOM_MAX) {
 602                 len = sprintf(buf, "ASSOCRESPIE=");
 603                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 604                         len += sprintf(buf + len, "%02x",
 605                                        ifmgd->assocresp_ies[i]);
 606                 }
 607         }
 608
 609         if (len <= IW_CUSTOM_MAX) {
 610                 memset(&wrqu, 0, sizeof(wrqu));
 611                 wrqu.data.length = len;
 612                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 613         }
 614
 615         kfree(buf);
 616 }
 617
 618
 619 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 620                                      u32 bss_info_changed)
 621 {
 622         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 623         struct ieee80211_local *local = sdata->local;
 624         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 625
 626         struct ieee80211_bss *bss;
 627
 628         bss_info_changed |= BSS_CHANGED_ASSOC;
 629         ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
 630
 631         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 632                                    conf->channel->center_freq,
 633                                    ifmgd->ssid, ifmgd->ssid_len);
 634         if (bss) {
 635                 /* set timing information */
 636                 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 637                 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 638                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 639
 640                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 641                         bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 642
 643                 ieee80211_rx_bss_put(local, bss);
 644         }
 645
 646         ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
 647         memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
 648         ieee80211_sta_send_associnfo(sdata);
 649
 650         ifmgd->last_probe = jiffies;
 651         ieee80211_led_assoc(local, 1);
 652
 653         sdata->vif.bss_conf.assoc = 1;
 654         /*
 655          * For now just always ask the driver to update the basic rateset
 656          * when we have associated, we aren't checking whether it actually
 657          * changed or not.
 658          */
 659         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 660         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 661
 662         if (local->powersave) {
 663                 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
 664                     local->hw.conf.dynamic_ps_timeout > 0) {
 665                         mod_timer(&local->dynamic_ps_timer, jiffies +
 666                                   msecs_to_jiffies(
 667                                         local->hw.conf.dynamic_ps_timeout));
 668                 } else {
 669                         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 670                                 ieee80211_send_nullfunc(local, sdata, 1);
 671                         conf->flags |= IEEE80211_CONF_PS;
 672                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 673                 }
 674         }
 675
 676         netif_tx_start_all_queues(sdata->dev);
 677         netif_carrier_on(sdata->dev);
 678
 679         ieee80211_sta_send_apinfo(sdata);
 680 }
 681
 682 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
 683 {
 684         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 685         struct ieee80211_local *local = sdata->local;
 686
 687         ifmgd->direct_probe_tries++;
 688         if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 689                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 690                        sdata->dev->name, ifmgd->bssid);
 691                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 692                 ieee80211_sta_send_apinfo(sdata);
 693
 694                 /*
 695                  * Most likely AP is not in the range so remove the
 696                  * bss information associated to the AP
 697                  */
 698                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 699                                 sdata->local->hw.conf.channel->center_freq,
 700                                 ifmgd->ssid, ifmgd->ssid_len);
 701
 702                 /*
 703                  * We might have a pending scan which had no chance to run yet
 704                  * due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
 705                  * Hence, queue the STAs work again
 706                  */
 707                 queue_work(local->hw.workqueue, &ifmgd->work);
 708                 return;
 709         }
 710
 711         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 712                         sdata->dev->name, ifmgd->bssid,
 713                         ifmgd->direct_probe_tries);
 714
 715         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 716
 717         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifmgd->request);
 718
 719         /* Direct probe is sent to broadcast address as some APs
 720          * will not answer to direct packet in unassociated state.
 721          */
 722         ieee80211_send_probe_req(sdata, NULL,
 723                                  ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
 724
 725         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 726 }
 727
 728
 729 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
 730 {
 731         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 732         struct ieee80211_local *local = sdata->local;
 733
 734         ifmgd->auth_tries++;
 735         if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 736                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 737                        " timed out\n",
 738                        sdata->dev->name, ifmgd->bssid);
 739                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 740                 ieee80211_sta_send_apinfo(sdata);
 741                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 742                                 sdata->local->hw.conf.channel->center_freq,
 743                                 ifmgd->ssid, ifmgd->ssid_len);
 744
 745                 /*
 746                  * We might have a pending scan which had no chance to run yet
 747                  * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
 748                  * Hence, queue the STAs work again
 749                  */
 750                 queue_work(local->hw.workqueue, &ifmgd->work);
 751                 return;
 752         }
 753
 754         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
 755         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 756                sdata->dev->name, ifmgd->bssid);
 757
 758         ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, NULL, 0,
 759                             ifmgd->bssid, 0);
 760         ifmgd->auth_transaction = 2;
 761
 762         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 763 }
 764
 765 /*
 766  * The disassoc 'reason' argument can be either our own reason
 767  * if self disconnected or a reason code from the AP.
 768  */
 769 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 770                                    bool deauth, bool self_disconnected,
 771                                    u16 reason)
 772 {
 773         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 774         struct ieee80211_local *local = sdata->local;
 775         struct sta_info *sta;
 776         u32 changed = 0, config_changed = 0;
 777
 778         rcu_read_lock();
 779
 780         sta = sta_info_get(local, ifmgd->bssid);
 781         if (!sta) {
 782                 rcu_read_unlock();
 783                 return;
 784         }
 785
 786         if (deauth) {
 787                 ifmgd->direct_probe_tries = 0;
 788                 ifmgd->auth_tries = 0;
 789         }
 790         ifmgd->assoc_scan_tries = 0;
 791         ifmgd->assoc_tries = 0;
 792
 793         netif_tx_stop_all_queues(sdata->dev);
 794         netif_carrier_off(sdata->dev);
 795
 796         ieee80211_sta_tear_down_BA_sessions(sta);
 797
 798         if (self_disconnected) {
 799                 if (deauth)
 800                         ieee80211_send_deauth_disassoc(sdata,
 801                                 IEEE80211_STYPE_DEAUTH, reason);
 802                 else
 803                         ieee80211_send_deauth_disassoc(sdata,
 804                                 IEEE80211_STYPE_DISASSOC, reason);
 805         }
 806
 807         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
 808         changed |= ieee80211_reset_erp_info(sdata);
 809
 810         ieee80211_led_assoc(local, 0);
 811         changed |= BSS_CHANGED_ASSOC;
 812         sdata->vif.bss_conf.assoc = false;
 813
 814         ieee80211_sta_send_apinfo(sdata);
 815
 816         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
 817                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 818                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 819                                 sdata->local->hw.conf.channel->center_freq,
 820                                 ifmgd->ssid, ifmgd->ssid_len);
 821         }
 822
 823         rcu_read_unlock();
 824
 825         /* channel(_type) changes are handled by ieee80211_hw_config */
 826         local->oper_channel_type = NL80211_CHAN_NO_HT;
 827
 828         local->power_constr_level = 0;
 829
 830         del_timer_sync(&local->dynamic_ps_timer);
 831         cancel_work_sync(&local->dynamic_ps_enable_work);
 832
 833         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 834                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 835                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 836         }
 837
 838         ieee80211_hw_config(local, config_changed);
 839         ieee80211_bss_info_change_notify(sdata, changed);
 840
 841         rcu_read_lock();
 842
 843         sta = sta_info_get(local, ifmgd->bssid);
 844         if (!sta) {
 845                 rcu_read_unlock();
 846                 return;
 847         }
 848
 849         sta_info_unlink(&sta);
 850
 851         rcu_read_unlock();
 852
 853         sta_info_destroy(sta);
 854 }
 855
 856 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
 857 {
 858         if (!sdata || !sdata->default_key ||
 859             sdata->default_key->conf.alg != ALG_WEP)
 860                 return 0;
 861         return 1;
 862 }
 863
 864 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
 865 {
 866         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 867         struct ieee80211_local *local = sdata->local;
 868         struct ieee80211_bss *bss;
 869         int bss_privacy;
 870         int wep_privacy;
 871         int privacy_invoked;
 872
 873         if (!ifmgd || (ifmgd->flags & IEEE80211_STA_MIXED_CELL))
 874                 return 0;
 875
 876         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 877                                    local->hw.conf.channel->center_freq,
 878                                    ifmgd->ssid, ifmgd->ssid_len);
 879         if (!bss)
 880                 return 0;
 881
 882         bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
 883         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
 884         privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
 885
 886         ieee80211_rx_bss_put(local, bss);
 887
 888         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
 889                 return 0;
 890
 891         return 1;
 892 }
 893
 894 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
 895 {
 896         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 897         struct ieee80211_local *local = sdata->local;
 898
 899         ifmgd->assoc_tries++;
 900         if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 901                 printk(KERN_DEBUG "%s: association with AP %pM"
 902                        " timed out\n",
 903                        sdata->dev->name, ifmgd->bssid);
 904                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 905                 ieee80211_sta_send_apinfo(sdata);
 906                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 907                                 sdata->local->hw.conf.channel->center_freq,
 908                                 ifmgd->ssid, ifmgd->ssid_len);
 909                 /*
 910                  * We might have a pending scan which had no chance to run yet
 911                  * due to state == IEEE80211_STA_MLME_ASSOCIATE.
 912                  * Hence, queue the STAs work again
 913                  */
 914                 queue_work(local->hw.workqueue, &ifmgd->work);
 915                 return;
 916         }
 917
 918         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
 919         printk(KERN_DEBUG "%s: associate with AP %pM\n",
 920                sdata->dev->name, ifmgd->bssid);
 921         if (ieee80211_privacy_mismatch(sdata)) {
 922                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 923                        "mixed-cell disabled - abort association\n", sdata->dev->name);
 924                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 925                 return;
 926         }
 927
 928         ieee80211_send_assoc(sdata);
 929
 930         mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 931 }
 932
 933
 934 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
 935 {
 936         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 937         struct ieee80211_local *local = sdata->local;
 938         struct sta_info *sta;
 939         int disassoc;
 940
 941         /* TODO: start monitoring current AP signal quality and number of
 942          * missed beacons. Scan other channels every now and then and search
 943          * for better APs. */
 944         /* TODO: remove expired BSSes */
 945
 946         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
 947
 948         rcu_read_lock();
 949
 950         sta = sta_info_get(local, ifmgd->bssid);
 951         if (!sta) {
 952                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
 953                        sdata->dev->name, ifmgd->bssid);
 954                 disassoc = 1;
 955         } else {
 956                 disassoc = 0;
 957                 if (time_after(jiffies,
 958                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 959                         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
 960                                 printk(KERN_DEBUG "%s: No ProbeResp from "
 961                                        "current AP %pM - assume out of "
 962                                        "range\n",
 963                                        sdata->dev->name, ifmgd->bssid);
 964                                 disassoc = 1;
 965                         } else
 966                                 ieee80211_send_probe_req(sdata, ifmgd->bssid,
 967                                                          ifmgd->ssid,
 968                                                          ifmgd->ssid_len,
 969                                                          NULL, 0);
 970                         ifmgd->flags ^= IEEE80211_STA_PROBEREQ_POLL;
 971                 } else {
 972                         ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
 973                         if (time_after(jiffies, ifmgd->last_probe +
 974                                        IEEE80211_PROBE_INTERVAL)) {
 975                                 ifmgd->last_probe = jiffies;
 976                                 ieee80211_send_probe_req(sdata, ifmgd->bssid,
 977                                                          ifmgd->ssid,
 978                                                          ifmgd->ssid_len,
 979                                                          NULL, 0);
 980                         }
 981                 }
 982         }
 983
 984         rcu_read_unlock();
 985
 986         if (disassoc)
 987                 ieee80211_set_disassoc(sdata, true, true,
 988                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
 989         else
 990                 mod_timer(&ifmgd->timer, jiffies +
 991                                       IEEE80211_MONITORING_INTERVAL);
 992 }
 993
 994
 995 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
 996 {
 997         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 998
 999         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1000         ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
1001         ieee80211_associate(sdata);
1002 }
1003
1004
1005 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1006                                      struct ieee80211_mgmt *mgmt,
1007                                      size_t len)
1008 {
1009         u8 *pos;
1010         struct ieee802_11_elems elems;
1011
1012         pos = mgmt->u.auth.variable;
1013         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1014         if (!elems.challenge)
1015                 return;
1016         ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
1017                             elems.challenge - 2, elems.challenge_len + 2,
1018                             sdata->u.mgd.bssid, 1);
1019         sdata->u.mgd.auth_transaction = 4;
1020 }
1021
1022 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1023                                    struct ieee80211_mgmt *mgmt,
1024                                    size_t len)
1025 {
1026         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1027         u16 auth_alg, auth_transaction, status_code;
1028
1029         if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1030                 return;
1031
1032         if (len < 24 + 6)
1033                 return;
1034
1035         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1036                 return;
1037
1038         if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1039                 return;
1040
1041         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1042         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1043         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1044
1045         if (auth_alg != ifmgd->auth_alg ||
1046             auth_transaction != ifmgd->auth_transaction)
1047                 return;
1048
1049         if (status_code != WLAN_STATUS_SUCCESS) {
1050                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1051                         u8 algs[3];
1052                         const int num_algs = ARRAY_SIZE(algs);
1053                         int i, pos;
1054                         algs[0] = algs[1] = algs[2] = 0xff;
1055                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1056                                 algs[0] = WLAN_AUTH_OPEN;
1057                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1058                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1059                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1060                                 algs[2] = WLAN_AUTH_LEAP;
1061                         if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1062                                 pos = 0;
1063                         else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1064                                 pos = 1;
1065                         else
1066                                 pos = 2;
1067                         for (i = 0; i < num_algs; i++) {
1068                                 pos++;
1069                                 if (pos >= num_algs)
1070                                         pos = 0;
1071                                 if (algs[pos] == ifmgd->auth_alg ||
1072                                     algs[pos] == 0xff)
1073                                         continue;
1074                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1075                                     !ieee80211_sta_wep_configured(sdata))
1076                                         continue;
1077                                 ifmgd->auth_alg = algs[pos];
1078                                 break;
1079                         }
1080                 }
1081                 return;
1082         }
1083
1084         switch (ifmgd->auth_alg) {
1085         case WLAN_AUTH_OPEN:
1086         case WLAN_AUTH_LEAP:
1087                 ieee80211_auth_completed(sdata);
1088                 break;
1089         case WLAN_AUTH_SHARED_KEY:
1090                 if (ifmgd->auth_transaction == 4)
1091                         ieee80211_auth_completed(sdata);
1092                 else
1093                         ieee80211_auth_challenge(sdata, mgmt, len);
1094                 break;
1095         }
1096 }
1097
1098
1099 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1100                                      struct ieee80211_mgmt *mgmt,
1101                                      size_t len)
1102 {
1103         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1104         u16 reason_code;
1105
1106         if (len < 24 + 2)
1107                 return;
1108
1109         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1110                 return;
1111
1112         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1113
1114         if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1115                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1116                                 sdata->dev->name, reason_code);
1117
1118         if (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1119             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1120             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1121                 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1122                 mod_timer(&ifmgd->timer, jiffies +
1123                                       IEEE80211_RETRY_AUTH_INTERVAL);
1124         }
1125
1126         ieee80211_set_disassoc(sdata, true, false, 0);
1127         ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1128 }
1129
1130
1131 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1132                                        struct ieee80211_mgmt *mgmt,
1133                                        size_t len)
1134 {
1135         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1136         u16 reason_code;
1137
1138         if (len < 24 + 2)
1139                 return;
1140
1141         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1142                 return;
1143
1144         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1145
1146         if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1147                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1148                                 sdata->dev->name, reason_code);
1149
1150         if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1151                 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1152                 mod_timer(&ifmgd->timer, jiffies +
1153                                       IEEE80211_RETRY_AUTH_INTERVAL);
1154         }
1155
1156         ieee80211_set_disassoc(sdata, false, false, reason_code);
1157 }
1158
1159
1160 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1161                                          struct ieee80211_mgmt *mgmt,
1162                                          size_t len,
1163                                          int reassoc)
1164 {
1165         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1166         struct ieee80211_local *local = sdata->local;
1167         struct ieee80211_supported_band *sband;
1168         struct sta_info *sta;
1169         u32 rates, basic_rates;
1170         u16 capab_info, status_code, aid;
1171         struct ieee802_11_elems elems;
1172         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1173         u8 *pos;
1174         u32 changed = 0;
1175         int i, j;
1176         bool have_higher_than_11mbit = false, newsta = false;
1177         u16 ap_ht_cap_flags;
1178
1179         /* AssocResp and ReassocResp have identical structure, so process both
1180          * of them in this function. */
1181
1182         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1183                 return;
1184
1185         if (len < 24 + 6)
1186                 return;
1187
1188         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1189                 return;
1190
1191         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1192         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1193         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1194
1195         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1196                "status=%d aid=%d)\n",
1197                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1198                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1199
1200         pos = mgmt->u.assoc_resp.variable;
1201         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1202
1203         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1204             elems.timeout_int && elems.timeout_int_len == 5 &&
1205             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1206                 u32 tu, ms;
1207                 tu = get_unaligned_le32(elems.timeout_int + 1);
1208                 ms = tu * 1024 / 1000;
1209                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1210                        "comeback duration %u TU (%u ms)\n",
1211                        sdata->dev->name, tu, ms);
1212                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1213                         mod_timer(&ifmgd->timer,
1214                                   jiffies + msecs_to_jiffies(ms));
1215                 return;
1216         }
1217
1218         if (status_code != WLAN_STATUS_SUCCESS) {
1219                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1220                        sdata->dev->name, status_code);
1221                 /* if this was a reassociation, ensure we try a "full"
1222                  * association next time. This works around some broken APs
1223                  * which do not correctly reject reassociation requests. */
1224                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1225                 return;
1226         }
1227
1228         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1229                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1230                        "set\n", sdata->dev->name, aid);
1231         aid &= ~(BIT(15) | BIT(14));
1232
1233         if (!elems.supp_rates) {
1234                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1235                        sdata->dev->name);
1236                 return;
1237         }
1238
1239         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1240         ifmgd->aid = aid;
1241         ifmgd->ap_capab = capab_info;
1242
1243         kfree(ifmgd->assocresp_ies);
1244         ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1245         ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1246         if (ifmgd->assocresp_ies)
1247                 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1248
1249         rcu_read_lock();
1250
1251         /* Add STA entry for the AP */
1252         sta = sta_info_get(local, ifmgd->bssid);
1253         if (!sta) {
1254                 newsta = true;
1255
1256                 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1257                 if (!sta) {
1258                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1259                                " the AP\n", sdata->dev->name);
1260                         rcu_read_unlock();
1261                         return;
1262                 }
1263
1264                 /* update new sta with its last rx activity */
1265                 sta->last_rx = jiffies;
1266         }
1267
1268         /*
1269          * FIXME: Do we really need to update the sta_info's information here?
1270          *        We already know about the AP (we found it in our list) so it
1271          *        should already be filled with the right info, no?
1272          *        As is stands, all this is racy because typically we assume
1273          *        the information that is filled in here (except flags) doesn't
1274          *        change while a STA structure is alive. As such, it should move
1275          *        to between the sta_info_alloc() and sta_info_insert() above.
1276          */
1277
1278         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1279                            WLAN_STA_AUTHORIZED);
1280
1281         rates = 0;
1282         basic_rates = 0;
1283         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1284
1285         for (i = 0; i < elems.supp_rates_len; i++) {
1286                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1287                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1288
1289                 if (rate > 110)
1290                         have_higher_than_11mbit = true;
1291
1292                 for (j = 0; j < sband->n_bitrates; j++) {
1293                         if (sband->bitrates[j].bitrate == rate) {
1294                                 rates |= BIT(j);
1295                                 if (is_basic)
1296                                         basic_rates |= BIT(j);
1297                                 break;
1298                         }
1299                 }
1300         }
1301
1302         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1303                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1304                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1305
1306                 if (rate > 110)
1307                         have_higher_than_11mbit = true;
1308
1309                 for (j = 0; j < sband->n_bitrates; j++) {
1310                         if (sband->bitrates[j].bitrate == rate) {
1311                                 rates |= BIT(j);
1312                                 if (is_basic)
1313                                         basic_rates |= BIT(j);
1314                                 break;
1315                         }
1316                 }
1317         }
1318
1319         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1320         sdata->vif.bss_conf.basic_rates = basic_rates;
1321
1322         /* cf. IEEE 802.11 9.2.12 */
1323         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1324             have_higher_than_11mbit)
1325                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1326         else
1327                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1328
1329         /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1330         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1331                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1332                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1333
1334         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1335
1336         rate_control_rate_init(sta);
1337
1338         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1339                 set_sta_flags(sta, WLAN_STA_MFP);
1340
1341         if (elems.wmm_param)
1342                 set_sta_flags(sta, WLAN_STA_WME);
1343
1344         if (newsta) {
1345                 int err = sta_info_insert(sta);
1346                 if (err) {
1347                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1348                                " the AP (error %d)\n", sdata->dev->name, err);
1349                         rcu_read_unlock();
1350                         return;
1351                 }
1352         }
1353
1354         rcu_read_unlock();
1355
1356         if (elems.wmm_param)
1357                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1358                                          elems.wmm_param_len);
1359
1360         if (elems.ht_info_elem && elems.wmm_param &&
1361             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1362             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1363                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1364                                                ap_ht_cap_flags);
1365
1366         /* set AID and assoc capability,
1367          * ieee80211_set_associated() will tell the driver */
1368         bss_conf->aid = aid;
1369         bss_conf->assoc_capability = capab_info;
1370         ieee80211_set_associated(sdata, changed);
1371
1372         ieee80211_associated(sdata);
1373 }
1374
1375
1376 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1377                                   struct ieee80211_mgmt *mgmt,
1378                                   size_t len,
1379                                   struct ieee80211_rx_status *rx_status,
1380                                   struct ieee802_11_elems *elems,
1381                                   bool beacon)
1382 {
1383         struct ieee80211_local *local = sdata->local;
1384         int freq;
1385         struct ieee80211_bss *bss;
1386         struct ieee80211_channel *channel;
1387
1388         if (elems->ds_params && elems->ds_params_len == 1)
1389                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1390         else
1391                 freq = rx_status->freq;
1392
1393         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1394
1395         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1396                 return;
1397
1398         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1399                                         channel, beacon);
1400         if (!bss)
1401                 return;
1402
1403         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1404             (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1405                 struct ieee80211_channel_sw_ie *sw_elem =
1406                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1407                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1408         }
1409
1410         ieee80211_rx_bss_put(local, bss);
1411 }
1412
1413
1414 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1415                                          struct ieee80211_mgmt *mgmt,
1416                                          size_t len,
1417                                          struct ieee80211_rx_status *rx_status)
1418 {
1419         size_t baselen;
1420         struct ieee802_11_elems elems;
1421
1422         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1423                 return; /* ignore ProbeResp to foreign address */
1424
1425         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1426         if (baselen > len)
1427                 return;
1428
1429         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1430                                 &elems);
1431
1432         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1433
1434         /* direct probe may be part of the association flow */
1435         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1436             &sdata->u.mgd.request)) {
1437                 printk(KERN_DEBUG "%s direct probe responded\n",
1438                        sdata->dev->name);
1439                 ieee80211_authenticate(sdata);
1440         }
1441 }
1442
1443 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1444                                      struct ieee80211_mgmt *mgmt,
1445                                      size_t len,
1446                                      struct ieee80211_rx_status *rx_status)
1447 {
1448         struct ieee80211_if_managed *ifmgd;
1449         size_t baselen;
1450         struct ieee802_11_elems elems;
1451         struct ieee80211_local *local = sdata->local;
1452         u32 changed = 0;
1453         bool erp_valid, directed_tim;
1454         u8 erp_value = 0;
1455
1456         /* Process beacon from the current BSS */
1457         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1458         if (baselen > len)
1459                 return;
1460
1461         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1462
1463         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1464
1465         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1466                 return;
1467
1468         ifmgd = &sdata->u.mgd;
1469
1470         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1471             memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1472                 return;
1473
1474         if (rx_status->freq != local->hw.conf.channel->center_freq)
1475                 return;
1476
1477         ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1478                                  elems.wmm_param_len);
1479
1480         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1481                 directed_tim = ieee80211_check_tim(&elems, ifmgd->aid);
1482
1483                 if (directed_tim) {
1484                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1485                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1486                                 ieee80211_hw_config(local,
1487                                                     IEEE80211_CONF_CHANGE_PS);
1488                                 ieee80211_send_nullfunc(local, sdata, 0);
1489                         } else {
1490                                 local->pspolling = true;
1491
1492                                 /*
1493                                  * Here is assumed that the driver will be
1494                                  * able to send ps-poll frame and receive a
1495                                  * response even though power save mode is
1496                                  * enabled, but some drivers might require
1497                                  * to disable power save here. This needs
1498                                  * to be investigated.
1499                                  */
1500                                 ieee80211_send_pspoll(local, sdata);
1501                         }
1502                 }
1503         }
1504
1505         if (elems.erp_info && elems.erp_info_len >= 1) {
1506                 erp_valid = true;
1507                 erp_value = elems.erp_info[0];
1508         } else {
1509                 erp_valid = false;
1510         }
1511         changed |= ieee80211_handle_bss_capability(sdata,
1512                         le16_to_cpu(mgmt->u.beacon.capab_info),
1513                         erp_valid, erp_value);
1514
1515
1516         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1517             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
1518                 struct sta_info *sta;
1519                 struct ieee80211_supported_band *sband;
1520                 u16 ap_ht_cap_flags;
1521
1522                 rcu_read_lock();
1523
1524                 sta = sta_info_get(local, ifmgd->bssid);
1525                 if (!sta) {
1526                         rcu_read_unlock();
1527                         return;
1528                 }
1529
1530                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1531
1532                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1533                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1534
1535                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1536
1537                 rcu_read_unlock();
1538
1539                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1540                                                ap_ht_cap_flags);
1541         }
1542
1543         if (elems.country_elem) {
1544                 /* Note we are only reviewing this on beacons
1545                  * for the BSSID we are associated to */
1546                 regulatory_hint_11d(local->hw.wiphy,
1547                         elems.country_elem, elems.country_elem_len);
1548
1549                 /* TODO: IBSS also needs this */
1550                 if (elems.pwr_constr_elem)
1551                         ieee80211_handle_pwr_constr(sdata,
1552                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1553                                 elems.pwr_constr_elem,
1554                                 elems.pwr_constr_elem_len);
1555         }
1556
1557         ieee80211_bss_info_change_notify(sdata, changed);
1558 }
1559
1560 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1561                                           struct sk_buff *skb,
1562                                           struct ieee80211_rx_status *rx_status)
1563 {
1564         struct ieee80211_local *local = sdata->local;
1565         struct ieee80211_mgmt *mgmt;
1566         u16 fc;
1567
1568         if (skb->len < 24)
1569                 return RX_DROP_MONITOR;
1570
1571         mgmt = (struct ieee80211_mgmt *) skb->data;
1572         fc = le16_to_cpu(mgmt->frame_control);
1573
1574         switch (fc & IEEE80211_FCTL_STYPE) {
1575         case IEEE80211_STYPE_PROBE_REQ:
1576         case IEEE80211_STYPE_PROBE_RESP:
1577         case IEEE80211_STYPE_BEACON:
1578                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1579         case IEEE80211_STYPE_AUTH:
1580         case IEEE80211_STYPE_ASSOC_RESP:
1581         case IEEE80211_STYPE_REASSOC_RESP:
1582         case IEEE80211_STYPE_DEAUTH:
1583         case IEEE80211_STYPE_DISASSOC:
1584                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1585                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1586                 return RX_QUEUED;
1587         }
1588
1589         return RX_DROP_MONITOR;
1590 }
1591
1592 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1593                                          struct sk_buff *skb)
1594 {
1595         struct ieee80211_rx_status *rx_status;
1596         struct ieee80211_mgmt *mgmt;
1597         u16 fc;
1598
1599         rx_status = (struct ieee80211_rx_status *) skb->cb;
1600         mgmt = (struct ieee80211_mgmt *) skb->data;
1601         fc = le16_to_cpu(mgmt->frame_control);
1602
1603         switch (fc & IEEE80211_FCTL_STYPE) {
1604         case IEEE80211_STYPE_PROBE_RESP:
1605                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
1606                                              rx_status);
1607                 break;
1608         case IEEE80211_STYPE_BEACON:
1609                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1610                                          rx_status);
1611                 break;
1612         case IEEE80211_STYPE_AUTH:
1613                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
1614                 break;
1615         case IEEE80211_STYPE_ASSOC_RESP:
1616                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
1617                 break;
1618         case IEEE80211_STYPE_REASSOC_RESP:
1619                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
1620                 break;
1621         case IEEE80211_STYPE_DEAUTH:
1622                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1623                 break;
1624         case IEEE80211_STYPE_DISASSOC:
1625                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1626                 break;
1627         }
1628
1629         kfree_skb(skb);
1630 }
1631
1632 static void ieee80211_sta_timer(unsigned long data)
1633 {
1634         struct ieee80211_sub_if_data *sdata =
1635                 (struct ieee80211_sub_if_data *) data;
1636         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1637         struct ieee80211_local *local = sdata->local;
1638
1639         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1640         queue_work(local->hw.workqueue, &ifmgd->work);
1641 }
1642
1643 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
1644 {
1645         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1646         struct ieee80211_local *local = sdata->local;
1647
1648         if (local->ops->reset_tsf) {
1649                 /* Reset own TSF to allow time synchronization work. */
1650                 local->ops->reset_tsf(local_to_hw(local));
1651         }
1652
1653         ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
1654
1655
1656         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1657                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1658         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1659                 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
1660         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1661                 ifmgd->auth_alg = WLAN_AUTH_LEAP;
1662         else
1663                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1664         ifmgd->auth_transaction = -1;
1665         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1666         ifmgd->assoc_scan_tries = 0;
1667         ifmgd->direct_probe_tries = 0;
1668         ifmgd->auth_tries = 0;
1669         ifmgd->assoc_tries = 0;
1670         netif_tx_stop_all_queues(sdata->dev);
1671         netif_carrier_off(sdata->dev);
1672 }
1673
1674 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
1675 {
1676         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1677         struct ieee80211_local *local = sdata->local;
1678         struct ieee80211_bss *bss;
1679         u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
1680         u8 ssid_len = ifmgd->ssid_len;
1681         u16 capa_mask = WLAN_CAPABILITY_ESS;
1682         u16 capa_val = WLAN_CAPABILITY_ESS;
1683         struct ieee80211_channel *chan = local->oper_channel;
1684
1685         if (ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
1686                             IEEE80211_STA_AUTO_BSSID_SEL |
1687                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
1688                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
1689                 if (sdata->default_key)
1690                         capa_val |= WLAN_CAPABILITY_PRIVACY;
1691         }
1692
1693         if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
1694                 chan = NULL;
1695
1696         if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1697                 bssid = NULL;
1698
1699         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
1700                 ssid = NULL;
1701                 ssid_len = 0;
1702         }
1703
1704         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
1705                                        bssid, ssid, ssid_len,
1706                                        capa_mask, capa_val);
1707
1708         if (bss) {
1709                 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
1710                 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
1711                         ieee80211_sta_set_ssid(sdata, bss->ssid,
1712                                                bss->ssid_len);
1713                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
1714                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
1715                                                     bss->supp_rates);
1716                 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
1717                         sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
1718                 else
1719                         sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
1720
1721                 /* Send out direct probe if no probe resp was received or
1722                  * the one we have is outdated
1723                  */
1724                 if (!bss->last_probe_resp ||
1725                     time_after(jiffies, bss->last_probe_resp
1726                                         + IEEE80211_SCAN_RESULT_EXPIRE))
1727                         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1728                 else
1729                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1730
1731                 ieee80211_rx_bss_put(local, bss);
1732                 ieee80211_sta_reset_auth(sdata);
1733                 return 0;
1734         } else {
1735                 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
1736                         ifmgd->assoc_scan_tries++;
1737                         /* XXX maybe racy? */
1738                         if (local->scan_req)
1739                                 return -1;
1740                         memcpy(local->int_scan_req.ssids[0].ssid,
1741                                ifmgd->ssid, IEEE80211_MAX_SSID_LEN);
1742                         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL)
1743                                 local->int_scan_req.ssids[0].ssid_len = 0;
1744                         else
1745                                 local->int_scan_req.ssids[0].ssid_len = ifmgd->ssid_len;
1746
1747                         if (ieee80211_start_scan(sdata, &local->int_scan_req))
1748                                 ieee80211_scan_failed(local);
1749
1750                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1751                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
1752                 } else {
1753                         ifmgd->assoc_scan_tries = 0;
1754                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1755                 }
1756         }
1757         return -1;
1758 }
1759
1760
1761 static void ieee80211_sta_work(struct work_struct *work)
1762 {
1763         struct ieee80211_sub_if_data *sdata =
1764                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1765         struct ieee80211_local *local = sdata->local;
1766         struct ieee80211_if_managed *ifmgd;
1767         struct sk_buff *skb;
1768
1769         if (!netif_running(sdata->dev))
1770                 return;
1771
1772         if (local->sw_scanning || local->hw_scanning)
1773                 return;
1774
1775         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1776                 return;
1777         ifmgd = &sdata->u.mgd;
1778
1779         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1780                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1781
1782         if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
1783             ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1784             ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
1785             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
1786                 /*
1787                  * The call to ieee80211_start_scan can fail but ieee80211_request_scan
1788                  * (which queued ieee80211_sta_work) did not return an error. Thus, call
1789                  * ieee80211_scan_failed here if ieee80211_start_scan fails in order to
1790                  * notify the scan requester.
1791                  */
1792                 if (ieee80211_start_scan(sdata, local->scan_req))
1793                         ieee80211_scan_failed(local);
1794                 return;
1795         }
1796
1797         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
1798                 if (ieee80211_sta_config_auth(sdata))
1799                         return;
1800                 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1801         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
1802                 return;
1803
1804         switch (ifmgd->state) {
1805         case IEEE80211_STA_MLME_DISABLED:
1806                 break;
1807         case IEEE80211_STA_MLME_DIRECT_PROBE:
1808                 ieee80211_direct_probe(sdata);
1809                 break;
1810         case IEEE80211_STA_MLME_AUTHENTICATE:
1811                 ieee80211_authenticate(sdata);
1812                 break;
1813         case IEEE80211_STA_MLME_ASSOCIATE:
1814                 ieee80211_associate(sdata);
1815                 break;
1816         case IEEE80211_STA_MLME_ASSOCIATED:
1817                 ieee80211_associated(sdata);
1818                 break;
1819         default:
1820                 WARN_ON(1);
1821                 break;
1822         }
1823
1824         if (ieee80211_privacy_mismatch(sdata)) {
1825                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
1826                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
1827
1828                 ieee80211_set_disassoc(sdata, false, true,
1829                                         WLAN_REASON_UNSPECIFIED);
1830         }
1831 }
1832
1833 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1834 {
1835         if (sdata->vif.type == NL80211_IFTYPE_STATION)
1836                 queue_work(sdata->local->hw.workqueue,
1837                            &sdata->u.mgd.work);
1838 }
1839
1840 /* interface setup */
1841 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1842 {
1843         struct ieee80211_if_managed *ifmgd;
1844
1845         ifmgd = &sdata->u.mgd;
1846         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1847         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1848         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1849                     (unsigned long) sdata);
1850         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1851                     (unsigned long) sdata);
1852         skb_queue_head_init(&ifmgd->skb_queue);
1853
1854         ifmgd->capab = WLAN_CAPABILITY_ESS;
1855         ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
1856                 IEEE80211_AUTH_ALG_SHARED_KEY;
1857         ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
1858                 IEEE80211_STA_AUTO_BSSID_SEL |
1859                 IEEE80211_STA_AUTO_CHANNEL_SEL;
1860         if (sdata->local->hw.queues >= 4)
1861                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
1862 }
1863
1864 /* configuration hooks */
1865 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
1866 {
1867         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1868         struct ieee80211_local *local = sdata->local;
1869
1870         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1871                 return;
1872
1873         if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
1874                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
1875             (ifmgd->flags & (IEEE80211_STA_SSID_SET |
1876                              IEEE80211_STA_AUTO_SSID_SEL))) {
1877
1878                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
1879                         ieee80211_set_disassoc(sdata, true, true,
1880                                                WLAN_REASON_DEAUTH_LEAVING);
1881
1882                 set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
1883                 queue_work(local->hw.workqueue, &ifmgd->work);
1884         }
1885 }
1886
1887 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
1888 {
1889         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1890
1891         if (ifmgd->ssid_len)
1892                 ifmgd->flags |= IEEE80211_STA_SSID_SET;
1893         else
1894                 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
1895
1896         return 0;
1897 }
1898
1899 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
1900 {
1901         struct ieee80211_if_managed *ifmgd;
1902
1903         if (len > IEEE80211_MAX_SSID_LEN)
1904                 return -EINVAL;
1905
1906         ifmgd = &sdata->u.mgd;
1907
1908         if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
1909                 /*
1910                  * Do not use reassociation if SSID is changed (different ESS).
1911                  */
1912                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1913                 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
1914                 memcpy(ifmgd->ssid, ssid, len);
1915                 ifmgd->ssid_len = len;
1916         }
1917
1918         return ieee80211_sta_commit(sdata);
1919 }
1920
1921 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
1922 {
1923         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1924         memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
1925         *len = ifmgd->ssid_len;
1926         return 0;
1927 }
1928
1929 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
1930 {
1931         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1932
1933         if (is_valid_ether_addr(bssid)) {
1934                 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
1935                 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
1936         } else {
1937                 memset(ifmgd->bssid, 0, ETH_ALEN);
1938                 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
1939         }
1940
1941         if (netif_running(sdata->dev)) {
1942                 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
1943                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
1944                                "the low-level driver\n", sdata->dev->name);
1945                 }
1946         }
1947
1948         return ieee80211_sta_commit(sdata);
1949 }
1950
1951 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
1952 {
1953         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1954
1955         kfree(ifmgd->extra_ie);
1956         if (len == 0) {
1957                 ifmgd->extra_ie = NULL;
1958                 ifmgd->extra_ie_len = 0;
1959                 return 0;
1960         }
1961         ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
1962         if (!ifmgd->extra_ie) {
1963                 ifmgd->extra_ie_len = 0;
1964                 return -ENOMEM;
1965         }
1966         memcpy(ifmgd->extra_ie, ie, len);
1967         ifmgd->extra_ie_len = len;
1968         return 0;
1969 }
1970
1971 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
1972 {
1973         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
1974                sdata->dev->name, reason);
1975
1976         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1977                 return -EINVAL;
1978
1979         ieee80211_set_disassoc(sdata, true, true, reason);
1980         return 0;
1981 }
1982
1983 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
1984 {
1985         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1986
1987         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
1988                sdata->dev->name, reason);
1989
1990         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1991                 return -EINVAL;
1992
1993         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
1994                 return -ENOLINK;
1995
1996         ieee80211_set_disassoc(sdata, false, true, reason);
1997         return 0;
1998 }
1999
2000 /* scan finished notification */
2001 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2002 {
2003         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2004
2005         /* Restart STA timers */
2006         rcu_read_lock();
2007         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2008                 ieee80211_restart_sta_timer(sdata);
2009         rcu_read_unlock();
2010 }
2011
2012 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2013 {
2014         struct ieee80211_local *local =
2015                 container_of(work, struct ieee80211_local,
2016                              dynamic_ps_disable_work);
2017
2018         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2019                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2020                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2021         }
2022
2023         ieee80211_wake_queues_by_reason(&local->hw,
2024                                         IEEE80211_QUEUE_STOP_REASON_PS);
2025 }
2026
2027 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2028 {
2029         struct ieee80211_local *local =
2030                 container_of(work, struct ieee80211_local,
2031                              dynamic_ps_enable_work);
2032         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2033
2034         if (local->hw.conf.flags & IEEE80211_CONF_PS)
2035                 return;
2036
2037         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2038                 ieee80211_send_nullfunc(local, sdata, 1);
2039
2040         local->hw.conf.flags |= IEEE80211_CONF_PS;
2041         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2042 }
2043
2044 void ieee80211_dynamic_ps_timer(unsigned long data)
2045 {
2046         struct ieee80211_local *local = (void *) data;
2047
2048         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2049 }
2050
2051 void ieee80211_send_nullfunc(struct ieee80211_local *local,
2052                              struct ieee80211_sub_if_data *sdata,
2053                              int powersave)
2054 {
2055         struct sk_buff *skb;
2056         struct ieee80211_hdr *nullfunc;
2057         __le16 fc;
2058
2059         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2060                 return;
2061
2062         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
2063         if (!skb) {
2064                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2065                        "frame\n", sdata->dev->name);
2066                 return;
2067         }
2068         skb_reserve(skb, local->hw.extra_tx_headroom);
2069
2070         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
2071         memset(nullfunc, 0, 24);
2072         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
2073                          IEEE80211_FCTL_TODS);
2074         if (powersave)
2075                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
2076         nullfunc->frame_control = fc;
2077         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2078         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
2079         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2080
2081         ieee80211_tx_skb(sdata, skb, 0);
2082 }