SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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         u8 *ies;
 734         size_t ies_len;
 735
 736         ifmgd->auth_tries++;
 737         if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 738                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 739                        " timed out\n",
 740                        sdata->dev->name, ifmgd->bssid);
 741                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 742                 ieee80211_sta_send_apinfo(sdata);
 743                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 744                                 sdata->local->hw.conf.channel->center_freq,
 745                                 ifmgd->ssid, ifmgd->ssid_len);
 746
 747                 /*
 748                  * We might have a pending scan which had no chance to run yet
 749                  * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
 750                  * Hence, queue the STAs work again
 751                  */
 752                 queue_work(local->hw.workqueue, &ifmgd->work);
 753                 return;
 754         }
 755
 756         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
 757         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 758                sdata->dev->name, ifmgd->bssid);
 759
 760         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
 761                 ies = ifmgd->sme_auth_ie;
 762                 ies_len = ifmgd->sme_auth_ie_len;
 763         } else {
 764                 ies = NULL;
 765                 ies_len = 0;
 766         }
 767         ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len,
 768                             ifmgd->bssid, 0);
 769         ifmgd->auth_transaction = 2;
 770
 771         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 772 }
 773
 774 /*
 775  * The disassoc 'reason' argument can be either our own reason
 776  * if self disconnected or a reason code from the AP.
 777  */
 778 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 779                                    bool deauth, bool self_disconnected,
 780                                    u16 reason)
 781 {
 782         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 783         struct ieee80211_local *local = sdata->local;
 784         struct sta_info *sta;
 785         u32 changed = 0, config_changed = 0;
 786
 787         rcu_read_lock();
 788
 789         sta = sta_info_get(local, ifmgd->bssid);
 790         if (!sta) {
 791                 rcu_read_unlock();
 792                 return;
 793         }
 794
 795         if (deauth) {
 796                 ifmgd->direct_probe_tries = 0;
 797                 ifmgd->auth_tries = 0;
 798         }
 799         ifmgd->assoc_scan_tries = 0;
 800         ifmgd->assoc_tries = 0;
 801
 802         netif_tx_stop_all_queues(sdata->dev);
 803         netif_carrier_off(sdata->dev);
 804
 805         ieee80211_sta_tear_down_BA_sessions(sta);
 806
 807         if (self_disconnected) {
 808                 if (deauth)
 809                         ieee80211_send_deauth_disassoc(sdata,
 810                                 IEEE80211_STYPE_DEAUTH, reason);
 811                 else
 812                         ieee80211_send_deauth_disassoc(sdata,
 813                                 IEEE80211_STYPE_DISASSOC, reason);
 814         }
 815
 816         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
 817         changed |= ieee80211_reset_erp_info(sdata);
 818
 819         ieee80211_led_assoc(local, 0);
 820         changed |= BSS_CHANGED_ASSOC;
 821         sdata->vif.bss_conf.assoc = false;
 822
 823         ieee80211_sta_send_apinfo(sdata);
 824
 825         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
 826                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 827                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 828                                 sdata->local->hw.conf.channel->center_freq,
 829                                 ifmgd->ssid, ifmgd->ssid_len);
 830         }
 831
 832         rcu_read_unlock();
 833
 834         /* channel(_type) changes are handled by ieee80211_hw_config */
 835         local->oper_channel_type = NL80211_CHAN_NO_HT;
 836
 837         local->power_constr_level = 0;
 838
 839         del_timer_sync(&local->dynamic_ps_timer);
 840         cancel_work_sync(&local->dynamic_ps_enable_work);
 841
 842         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 843                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 844                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 845         }
 846
 847         ieee80211_hw_config(local, config_changed);
 848         ieee80211_bss_info_change_notify(sdata, changed);
 849
 850         rcu_read_lock();
 851
 852         sta = sta_info_get(local, ifmgd->bssid);
 853         if (!sta) {
 854                 rcu_read_unlock();
 855                 return;
 856         }
 857
 858         sta_info_unlink(&sta);
 859
 860         rcu_read_unlock();
 861
 862         sta_info_destroy(sta);
 863 }
 864
 865 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
 866 {
 867         if (!sdata || !sdata->default_key ||
 868             sdata->default_key->conf.alg != ALG_WEP)
 869                 return 0;
 870         return 1;
 871 }
 872
 873 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
 874 {
 875         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 876         struct ieee80211_local *local = sdata->local;
 877         struct ieee80211_bss *bss;
 878         int bss_privacy;
 879         int wep_privacy;
 880         int privacy_invoked;
 881
 882         if (!ifmgd || (ifmgd->flags & (IEEE80211_STA_MIXED_CELL |
 883                                        IEEE80211_STA_EXT_SME)))
 884                 return 0;
 885
 886         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 887                                    local->hw.conf.channel->center_freq,
 888                                    ifmgd->ssid, ifmgd->ssid_len);
 889         if (!bss)
 890                 return 0;
 891
 892         bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
 893         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
 894         privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
 895
 896         ieee80211_rx_bss_put(local, bss);
 897
 898         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
 899                 return 0;
 900
 901         return 1;
 902 }
 903
 904 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
 905 {
 906         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 907         struct ieee80211_local *local = sdata->local;
 908
 909         ifmgd->assoc_tries++;
 910         if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 911                 printk(KERN_DEBUG "%s: association with AP %pM"
 912                        " timed out\n",
 913                        sdata->dev->name, ifmgd->bssid);
 914                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 915                 ieee80211_sta_send_apinfo(sdata);
 916                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 917                                 sdata->local->hw.conf.channel->center_freq,
 918                                 ifmgd->ssid, ifmgd->ssid_len);
 919                 /*
 920                  * We might have a pending scan which had no chance to run yet
 921                  * due to state == IEEE80211_STA_MLME_ASSOCIATE.
 922                  * Hence, queue the STAs work again
 923                  */
 924                 queue_work(local->hw.workqueue, &ifmgd->work);
 925                 return;
 926         }
 927
 928         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
 929         printk(KERN_DEBUG "%s: associate with AP %pM\n",
 930                sdata->dev->name, ifmgd->bssid);
 931         if (ieee80211_privacy_mismatch(sdata)) {
 932                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 933                        "mixed-cell disabled - abort association\n", sdata->dev->name);
 934                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 935                 return;
 936         }
 937
 938         ieee80211_send_assoc(sdata);
 939
 940         mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 941 }
 942
 943
 944 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
 945 {
 946         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 947         struct ieee80211_local *local = sdata->local;
 948         struct sta_info *sta;
 949         int disassoc;
 950
 951         /* TODO: start monitoring current AP signal quality and number of
 952          * missed beacons. Scan other channels every now and then and search
 953          * for better APs. */
 954         /* TODO: remove expired BSSes */
 955
 956         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
 957
 958         rcu_read_lock();
 959
 960         sta = sta_info_get(local, ifmgd->bssid);
 961         if (!sta) {
 962                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
 963                        sdata->dev->name, ifmgd->bssid);
 964                 disassoc = 1;
 965         } else {
 966                 disassoc = 0;
 967                 if (time_after(jiffies,
 968                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 969                         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
 970                                 printk(KERN_DEBUG "%s: No ProbeResp from "
 971                                        "current AP %pM - assume out of "
 972                                        "range\n",
 973                                        sdata->dev->name, ifmgd->bssid);
 974                                 disassoc = 1;
 975                         } else
 976                                 ieee80211_send_probe_req(sdata, ifmgd->bssid,
 977                                                          ifmgd->ssid,
 978                                                          ifmgd->ssid_len,
 979                                                          NULL, 0);
 980                         ifmgd->flags ^= IEEE80211_STA_PROBEREQ_POLL;
 981                 } else {
 982                         ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
 983                         if (time_after(jiffies, ifmgd->last_probe +
 984                                        IEEE80211_PROBE_INTERVAL)) {
 985                                 ifmgd->last_probe = jiffies;
 986                                 ieee80211_send_probe_req(sdata, ifmgd->bssid,
 987                                                          ifmgd->ssid,
 988                                                          ifmgd->ssid_len,
 989                                                          NULL, 0);
 990                         }
 991                 }
 992         }
 993
 994         rcu_read_unlock();
 995
 996         if (disassoc)
 997                 ieee80211_set_disassoc(sdata, true, true,
 998                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
 999         else
1000                 mod_timer(&ifmgd->timer, jiffies +
1001                                       IEEE80211_MONITORING_INTERVAL);
1002 }
1003
1004
1005 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
1006 {
1007         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1008
1009         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1010         ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
1011         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1012                 /* Wait for SME to request association */
1013                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1014         } else
1015                 ieee80211_associate(sdata);
1016 }
1017
1018
1019 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1020                                      struct ieee80211_mgmt *mgmt,
1021                                      size_t len)
1022 {
1023         u8 *pos;
1024         struct ieee802_11_elems elems;
1025
1026         pos = mgmt->u.auth.variable;
1027         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1028         if (!elems.challenge)
1029                 return;
1030         ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
1031                             elems.challenge - 2, elems.challenge_len + 2,
1032                             sdata->u.mgd.bssid, 1);
1033         sdata->u.mgd.auth_transaction = 4;
1034 }
1035
1036 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1037                                    struct ieee80211_mgmt *mgmt,
1038                                    size_t len)
1039 {
1040         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1041         u16 auth_alg, auth_transaction, status_code;
1042
1043         if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1044                 return;
1045
1046         if (len < 24 + 6)
1047                 return;
1048
1049         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1050                 return;
1051
1052         if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1053                 return;
1054
1055         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1056         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1057         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1058
1059         if (auth_alg != ifmgd->auth_alg ||
1060             auth_transaction != ifmgd->auth_transaction)
1061                 return;
1062
1063         if (status_code != WLAN_STATUS_SUCCESS) {
1064                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1065                         u8 algs[3];
1066                         const int num_algs = ARRAY_SIZE(algs);
1067                         int i, pos;
1068                         algs[0] = algs[1] = algs[2] = 0xff;
1069                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1070                                 algs[0] = WLAN_AUTH_OPEN;
1071                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1072                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1073                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1074                                 algs[2] = WLAN_AUTH_LEAP;
1075                         if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1076                                 pos = 0;
1077                         else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1078                                 pos = 1;
1079                         else
1080                                 pos = 2;
1081                         for (i = 0; i < num_algs; i++) {
1082                                 pos++;
1083                                 if (pos >= num_algs)
1084                                         pos = 0;
1085                                 if (algs[pos] == ifmgd->auth_alg ||
1086                                     algs[pos] == 0xff)
1087                                         continue;
1088                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1089                                     !ieee80211_sta_wep_configured(sdata))
1090                                         continue;
1091                                 ifmgd->auth_alg = algs[pos];
1092                                 break;
1093                         }
1094                 }
1095                 return;
1096         }
1097
1098         switch (ifmgd->auth_alg) {
1099         case WLAN_AUTH_OPEN:
1100         case WLAN_AUTH_LEAP:
1101         case WLAN_AUTH_FT:
1102                 ieee80211_auth_completed(sdata);
1103                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1104                 break;
1105         case WLAN_AUTH_SHARED_KEY:
1106                 if (ifmgd->auth_transaction == 4) {
1107                         ieee80211_auth_completed(sdata);
1108                         cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1109                 } else
1110                         ieee80211_auth_challenge(sdata, mgmt, len);
1111                 break;
1112         }
1113 }
1114
1115
1116 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1117                                      struct ieee80211_mgmt *mgmt,
1118                                      size_t len)
1119 {
1120         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1121         u16 reason_code;
1122
1123         if (len < 24 + 2)
1124                 return;
1125
1126         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1127                 return;
1128
1129         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1130
1131         if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1132                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1133                                 sdata->dev->name, reason_code);
1134
1135         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1136             (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1137              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1138              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)) {
1139                 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1140                 mod_timer(&ifmgd->timer, jiffies +
1141                                       IEEE80211_RETRY_AUTH_INTERVAL);
1142         }
1143
1144         ieee80211_set_disassoc(sdata, true, false, 0);
1145         ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1146         cfg80211_send_rx_deauth(sdata->dev, (u8 *) mgmt, len);
1147 }
1148
1149
1150 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1151                                        struct ieee80211_mgmt *mgmt,
1152                                        size_t len)
1153 {
1154         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1155         u16 reason_code;
1156
1157         if (len < 24 + 2)
1158                 return;
1159
1160         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1161                 return;
1162
1163         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1164
1165         if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1166                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1167                                 sdata->dev->name, reason_code);
1168
1169         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1170             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1171                 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1172                 mod_timer(&ifmgd->timer, jiffies +
1173                                       IEEE80211_RETRY_AUTH_INTERVAL);
1174         }
1175
1176         ieee80211_set_disassoc(sdata, false, false, reason_code);
1177         cfg80211_send_rx_disassoc(sdata->dev, (u8 *) mgmt, len);
1178 }
1179
1180
1181 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1182                                          struct ieee80211_mgmt *mgmt,
1183                                          size_t len,
1184                                          int reassoc)
1185 {
1186         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1187         struct ieee80211_local *local = sdata->local;
1188         struct ieee80211_supported_band *sband;
1189         struct sta_info *sta;
1190         u32 rates, basic_rates;
1191         u16 capab_info, status_code, aid;
1192         struct ieee802_11_elems elems;
1193         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1194         u8 *pos;
1195         u32 changed = 0;
1196         int i, j;
1197         bool have_higher_than_11mbit = false, newsta = false;
1198         u16 ap_ht_cap_flags;
1199
1200         /* AssocResp and ReassocResp have identical structure, so process both
1201          * of them in this function. */
1202
1203         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1204                 return;
1205
1206         if (len < 24 + 6)
1207                 return;
1208
1209         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1210                 return;
1211
1212         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1213         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1214         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1215
1216         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1217                "status=%d aid=%d)\n",
1218                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1219                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1220
1221         pos = mgmt->u.assoc_resp.variable;
1222         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1223
1224         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1225             elems.timeout_int && elems.timeout_int_len == 5 &&
1226             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1227                 u32 tu, ms;
1228                 tu = get_unaligned_le32(elems.timeout_int + 1);
1229                 ms = tu * 1024 / 1000;
1230                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1231                        "comeback duration %u TU (%u ms)\n",
1232                        sdata->dev->name, tu, ms);
1233                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1234                         mod_timer(&ifmgd->timer,
1235                                   jiffies + msecs_to_jiffies(ms));
1236                 return;
1237         }
1238
1239         if (status_code != WLAN_STATUS_SUCCESS) {
1240                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1241                        sdata->dev->name, status_code);
1242                 /* if this was a reassociation, ensure we try a "full"
1243                  * association next time. This works around some broken APs
1244                  * which do not correctly reject reassociation requests. */
1245                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1246                 return;
1247         }
1248
1249         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1250                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1251                        "set\n", sdata->dev->name, aid);
1252         aid &= ~(BIT(15) | BIT(14));
1253
1254         if (!elems.supp_rates) {
1255                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1256                        sdata->dev->name);
1257                 return;
1258         }
1259
1260         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1261         ifmgd->aid = aid;
1262         ifmgd->ap_capab = capab_info;
1263
1264         kfree(ifmgd->assocresp_ies);
1265         ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1266         ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1267         if (ifmgd->assocresp_ies)
1268                 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1269
1270         rcu_read_lock();
1271
1272         /* Add STA entry for the AP */
1273         sta = sta_info_get(local, ifmgd->bssid);
1274         if (!sta) {
1275                 newsta = true;
1276
1277                 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1278                 if (!sta) {
1279                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1280                                " the AP\n", sdata->dev->name);
1281                         rcu_read_unlock();
1282                         return;
1283                 }
1284
1285                 /* update new sta with its last rx activity */
1286                 sta->last_rx = jiffies;
1287         }
1288
1289         /*
1290          * FIXME: Do we really need to update the sta_info's information here?
1291          *        We already know about the AP (we found it in our list) so it
1292          *        should already be filled with the right info, no?
1293          *        As is stands, all this is racy because typically we assume
1294          *        the information that is filled in here (except flags) doesn't
1295          *        change while a STA structure is alive. As such, it should move
1296          *        to between the sta_info_alloc() and sta_info_insert() above.
1297          */
1298
1299         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1300                            WLAN_STA_AUTHORIZED);
1301
1302         rates = 0;
1303         basic_rates = 0;
1304         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1305
1306         for (i = 0; i < elems.supp_rates_len; i++) {
1307                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1308                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1309
1310                 if (rate > 110)
1311                         have_higher_than_11mbit = true;
1312
1313                 for (j = 0; j < sband->n_bitrates; j++) {
1314                         if (sband->bitrates[j].bitrate == rate) {
1315                                 rates |= BIT(j);
1316                                 if (is_basic)
1317                                         basic_rates |= BIT(j);
1318                                 break;
1319                         }
1320                 }
1321         }
1322
1323         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1324                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1325                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1326
1327                 if (rate > 110)
1328                         have_higher_than_11mbit = true;
1329
1330                 for (j = 0; j < sband->n_bitrates; j++) {
1331                         if (sband->bitrates[j].bitrate == rate) {
1332                                 rates |= BIT(j);
1333                                 if (is_basic)
1334                                         basic_rates |= BIT(j);
1335                                 break;
1336                         }
1337                 }
1338         }
1339
1340         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1341         sdata->vif.bss_conf.basic_rates = basic_rates;
1342
1343         /* cf. IEEE 802.11 9.2.12 */
1344         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1345             have_higher_than_11mbit)
1346                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1347         else
1348                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1349
1350         /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1351         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1352                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1353                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1354
1355         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1356
1357         rate_control_rate_init(sta);
1358
1359         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1360                 set_sta_flags(sta, WLAN_STA_MFP);
1361
1362         if (elems.wmm_param)
1363                 set_sta_flags(sta, WLAN_STA_WME);
1364
1365         if (newsta) {
1366                 int err = sta_info_insert(sta);
1367                 if (err) {
1368                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1369                                " the AP (error %d)\n", sdata->dev->name, err);
1370                         rcu_read_unlock();
1371                         return;
1372                 }
1373         }
1374
1375         rcu_read_unlock();
1376
1377         if (elems.wmm_param)
1378                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1379                                          elems.wmm_param_len);
1380
1381         if (elems.ht_info_elem && elems.wmm_param &&
1382             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1383             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1384                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1385                                                ap_ht_cap_flags);
1386
1387         /* set AID and assoc capability,
1388          * ieee80211_set_associated() will tell the driver */
1389         bss_conf->aid = aid;
1390         bss_conf->assoc_capability = capab_info;
1391         ieee80211_set_associated(sdata, changed);
1392
1393         ieee80211_associated(sdata);
1394         cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1395 }
1396
1397
1398 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1399                                   struct ieee80211_mgmt *mgmt,
1400                                   size_t len,
1401                                   struct ieee80211_rx_status *rx_status,
1402                                   struct ieee802_11_elems *elems,
1403                                   bool beacon)
1404 {
1405         struct ieee80211_local *local = sdata->local;
1406         int freq;
1407         struct ieee80211_bss *bss;
1408         struct ieee80211_channel *channel;
1409
1410         if (elems->ds_params && elems->ds_params_len == 1)
1411                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1412         else
1413                 freq = rx_status->freq;
1414
1415         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1416
1417         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1418                 return;
1419
1420         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1421                                         channel, beacon);
1422         if (!bss)
1423                 return;
1424
1425         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1426             (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1427                 struct ieee80211_channel_sw_ie *sw_elem =
1428                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1429                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1430         }
1431
1432         ieee80211_rx_bss_put(local, bss);
1433 }
1434
1435
1436 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1437                                          struct ieee80211_mgmt *mgmt,
1438                                          size_t len,
1439                                          struct ieee80211_rx_status *rx_status)
1440 {
1441         size_t baselen;
1442         struct ieee802_11_elems elems;
1443
1444         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1445                 return; /* ignore ProbeResp to foreign address */
1446
1447         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1448         if (baselen > len)
1449                 return;
1450
1451         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1452                                 &elems);
1453
1454         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1455
1456         /* direct probe may be part of the association flow */
1457         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1458             &sdata->u.mgd.request)) {
1459                 printk(KERN_DEBUG "%s direct probe responded\n",
1460                        sdata->dev->name);
1461                 ieee80211_authenticate(sdata);
1462         }
1463 }
1464
1465 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1466                                      struct ieee80211_mgmt *mgmt,
1467                                      size_t len,
1468                                      struct ieee80211_rx_status *rx_status)
1469 {
1470         struct ieee80211_if_managed *ifmgd;
1471         size_t baselen;
1472         struct ieee802_11_elems elems;
1473         struct ieee80211_local *local = sdata->local;
1474         u32 changed = 0;
1475         bool erp_valid, directed_tim;
1476         u8 erp_value = 0;
1477
1478         /* Process beacon from the current BSS */
1479         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1480         if (baselen > len)
1481                 return;
1482
1483         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1484
1485         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1486
1487         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1488                 return;
1489
1490         ifmgd = &sdata->u.mgd;
1491
1492         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1493             memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1494                 return;
1495
1496         if (rx_status->freq != local->hw.conf.channel->center_freq)
1497                 return;
1498
1499         ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1500                                  elems.wmm_param_len);
1501
1502         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1503                 directed_tim = ieee80211_check_tim(&elems, ifmgd->aid);
1504
1505                 if (directed_tim) {
1506                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1507                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1508                                 ieee80211_hw_config(local,
1509                                                     IEEE80211_CONF_CHANGE_PS);
1510                                 ieee80211_send_nullfunc(local, sdata, 0);
1511                         } else {
1512                                 local->pspolling = true;
1513
1514                                 /*
1515                                  * Here is assumed that the driver will be
1516                                  * able to send ps-poll frame and receive a
1517                                  * response even though power save mode is
1518                                  * enabled, but some drivers might require
1519                                  * to disable power save here. This needs
1520                                  * to be investigated.
1521                                  */
1522                                 ieee80211_send_pspoll(local, sdata);
1523                         }
1524                 }
1525         }
1526
1527         if (elems.erp_info && elems.erp_info_len >= 1) {
1528                 erp_valid = true;
1529                 erp_value = elems.erp_info[0];
1530         } else {
1531                 erp_valid = false;
1532         }
1533         changed |= ieee80211_handle_bss_capability(sdata,
1534                         le16_to_cpu(mgmt->u.beacon.capab_info),
1535                         erp_valid, erp_value);
1536
1537
1538         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1539             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
1540                 struct sta_info *sta;
1541                 struct ieee80211_supported_band *sband;
1542                 u16 ap_ht_cap_flags;
1543
1544                 rcu_read_lock();
1545
1546                 sta = sta_info_get(local, ifmgd->bssid);
1547                 if (!sta) {
1548                         rcu_read_unlock();
1549                         return;
1550                 }
1551
1552                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1553
1554                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1555                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1556
1557                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1558
1559                 rcu_read_unlock();
1560
1561                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1562                                                ap_ht_cap_flags);
1563         }
1564
1565         if (elems.country_elem) {
1566                 /* Note we are only reviewing this on beacons
1567                  * for the BSSID we are associated to */
1568                 regulatory_hint_11d(local->hw.wiphy,
1569                         elems.country_elem, elems.country_elem_len);
1570
1571                 /* TODO: IBSS also needs this */
1572                 if (elems.pwr_constr_elem)
1573                         ieee80211_handle_pwr_constr(sdata,
1574                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1575                                 elems.pwr_constr_elem,
1576                                 elems.pwr_constr_elem_len);
1577         }
1578
1579         ieee80211_bss_info_change_notify(sdata, changed);
1580 }
1581
1582 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1583                                           struct sk_buff *skb,
1584                                           struct ieee80211_rx_status *rx_status)
1585 {
1586         struct ieee80211_local *local = sdata->local;
1587         struct ieee80211_mgmt *mgmt;
1588         u16 fc;
1589
1590         if (skb->len < 24)
1591                 return RX_DROP_MONITOR;
1592
1593         mgmt = (struct ieee80211_mgmt *) skb->data;
1594         fc = le16_to_cpu(mgmt->frame_control);
1595
1596         switch (fc & IEEE80211_FCTL_STYPE) {
1597         case IEEE80211_STYPE_PROBE_REQ:
1598         case IEEE80211_STYPE_PROBE_RESP:
1599         case IEEE80211_STYPE_BEACON:
1600                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1601         case IEEE80211_STYPE_AUTH:
1602         case IEEE80211_STYPE_ASSOC_RESP:
1603         case IEEE80211_STYPE_REASSOC_RESP:
1604         case IEEE80211_STYPE_DEAUTH:
1605         case IEEE80211_STYPE_DISASSOC:
1606                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1607                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1608                 return RX_QUEUED;
1609         }
1610
1611         return RX_DROP_MONITOR;
1612 }
1613
1614 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1615                                          struct sk_buff *skb)
1616 {
1617         struct ieee80211_rx_status *rx_status;
1618         struct ieee80211_mgmt *mgmt;
1619         u16 fc;
1620
1621         rx_status = (struct ieee80211_rx_status *) skb->cb;
1622         mgmt = (struct ieee80211_mgmt *) skb->data;
1623         fc = le16_to_cpu(mgmt->frame_control);
1624
1625         switch (fc & IEEE80211_FCTL_STYPE) {
1626         case IEEE80211_STYPE_PROBE_RESP:
1627                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
1628                                              rx_status);
1629                 break;
1630         case IEEE80211_STYPE_BEACON:
1631                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1632                                          rx_status);
1633                 break;
1634         case IEEE80211_STYPE_AUTH:
1635                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
1636                 break;
1637         case IEEE80211_STYPE_ASSOC_RESP:
1638                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
1639                 break;
1640         case IEEE80211_STYPE_REASSOC_RESP:
1641                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
1642                 break;
1643         case IEEE80211_STYPE_DEAUTH:
1644                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1645                 break;
1646         case IEEE80211_STYPE_DISASSOC:
1647                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1648                 break;
1649         }
1650
1651         kfree_skb(skb);
1652 }
1653
1654 static void ieee80211_sta_timer(unsigned long data)
1655 {
1656         struct ieee80211_sub_if_data *sdata =
1657                 (struct ieee80211_sub_if_data *) data;
1658         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1659         struct ieee80211_local *local = sdata->local;
1660
1661         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1662         queue_work(local->hw.workqueue, &ifmgd->work);
1663 }
1664
1665 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
1666 {
1667         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1668         struct ieee80211_local *local = sdata->local;
1669
1670         if (local->ops->reset_tsf) {
1671                 /* Reset own TSF to allow time synchronization work. */
1672                 local->ops->reset_tsf(local_to_hw(local));
1673         }
1674
1675         ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
1676
1677
1678         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1679                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1680         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1681                 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
1682         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1683                 ifmgd->auth_alg = WLAN_AUTH_LEAP;
1684         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT)
1685                 ifmgd->auth_alg = WLAN_AUTH_FT;
1686         else
1687                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1688         ifmgd->auth_transaction = -1;
1689         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1690         ifmgd->assoc_scan_tries = 0;
1691         ifmgd->direct_probe_tries = 0;
1692         ifmgd->auth_tries = 0;
1693         ifmgd->assoc_tries = 0;
1694         netif_tx_stop_all_queues(sdata->dev);
1695         netif_carrier_off(sdata->dev);
1696 }
1697
1698 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
1699 {
1700         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1701         struct ieee80211_local *local = sdata->local;
1702         struct ieee80211_bss *bss;
1703         u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
1704         u8 ssid_len = ifmgd->ssid_len;
1705         u16 capa_mask = WLAN_CAPABILITY_ESS;
1706         u16 capa_val = WLAN_CAPABILITY_ESS;
1707         struct ieee80211_channel *chan = local->oper_channel;
1708
1709         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1710             ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
1711                             IEEE80211_STA_AUTO_BSSID_SEL |
1712                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
1713                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
1714                 if (sdata->default_key)
1715                         capa_val |= WLAN_CAPABILITY_PRIVACY;
1716         }
1717
1718         if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
1719                 chan = NULL;
1720
1721         if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1722                 bssid = NULL;
1723
1724         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
1725                 ssid = NULL;
1726                 ssid_len = 0;
1727         }
1728
1729         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
1730                                        bssid, ssid, ssid_len,
1731                                        capa_mask, capa_val);
1732
1733         if (bss) {
1734                 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
1735                 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
1736                         ieee80211_sta_set_ssid(sdata, bss->ssid,
1737                                                bss->ssid_len);
1738                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
1739                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
1740                                                     bss->supp_rates);
1741                 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
1742                         sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
1743                 else
1744                         sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
1745
1746                 /* Send out direct probe if no probe resp was received or
1747                  * the one we have is outdated
1748                  */
1749                 if (!bss->last_probe_resp ||
1750                     time_after(jiffies, bss->last_probe_resp
1751                                         + IEEE80211_SCAN_RESULT_EXPIRE))
1752                         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1753                 else
1754                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1755
1756                 ieee80211_rx_bss_put(local, bss);
1757                 ieee80211_sta_reset_auth(sdata);
1758                 return 0;
1759         } else {
1760                 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
1761                         ifmgd->assoc_scan_tries++;
1762                         /* XXX maybe racy? */
1763                         if (local->scan_req)
1764                                 return -1;
1765                         memcpy(local->int_scan_req.ssids[0].ssid,
1766                                ifmgd->ssid, IEEE80211_MAX_SSID_LEN);
1767                         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL)
1768                                 local->int_scan_req.ssids[0].ssid_len = 0;
1769                         else
1770                                 local->int_scan_req.ssids[0].ssid_len = ifmgd->ssid_len;
1771
1772                         if (ieee80211_start_scan(sdata, &local->int_scan_req))
1773                                 ieee80211_scan_failed(local);
1774
1775                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1776                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
1777                 } else {
1778                         ifmgd->assoc_scan_tries = 0;
1779                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1780                 }
1781         }
1782         return -1;
1783 }
1784
1785
1786 static void ieee80211_sta_work(struct work_struct *work)
1787 {
1788         struct ieee80211_sub_if_data *sdata =
1789                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1790         struct ieee80211_local *local = sdata->local;
1791         struct ieee80211_if_managed *ifmgd;
1792         struct sk_buff *skb;
1793
1794         if (!netif_running(sdata->dev))
1795                 return;
1796
1797         if (local->sw_scanning || local->hw_scanning)
1798                 return;
1799
1800         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1801                 return;
1802         ifmgd = &sdata->u.mgd;
1803
1804         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1805                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1806
1807         if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
1808             ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1809             ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
1810             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
1811                 /*
1812                  * The call to ieee80211_start_scan can fail but ieee80211_request_scan
1813                  * (which queued ieee80211_sta_work) did not return an error. Thus, call
1814                  * ieee80211_scan_failed here if ieee80211_start_scan fails in order to
1815                  * notify the scan requester.
1816                  */
1817                 if (ieee80211_start_scan(sdata, local->scan_req))
1818                         ieee80211_scan_failed(local);
1819                 return;
1820         }
1821
1822         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
1823                 if (ieee80211_sta_config_auth(sdata))
1824                         return;
1825                 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1826         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
1827                 return;
1828
1829         switch (ifmgd->state) {
1830         case IEEE80211_STA_MLME_DISABLED:
1831                 break;
1832         case IEEE80211_STA_MLME_DIRECT_PROBE:
1833                 ieee80211_direct_probe(sdata);
1834                 break;
1835         case IEEE80211_STA_MLME_AUTHENTICATE:
1836                 ieee80211_authenticate(sdata);
1837                 break;
1838         case IEEE80211_STA_MLME_ASSOCIATE:
1839                 ieee80211_associate(sdata);
1840                 break;
1841         case IEEE80211_STA_MLME_ASSOCIATED:
1842                 ieee80211_associated(sdata);
1843                 break;
1844         default:
1845                 WARN_ON(1);
1846                 break;
1847         }
1848
1849         if (ieee80211_privacy_mismatch(sdata)) {
1850                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
1851                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
1852
1853                 ieee80211_set_disassoc(sdata, false, true,
1854                                         WLAN_REASON_UNSPECIFIED);
1855         }
1856 }
1857
1858 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1859 {
1860         if (sdata->vif.type == NL80211_IFTYPE_STATION)
1861                 queue_work(sdata->local->hw.workqueue,
1862                            &sdata->u.mgd.work);
1863 }
1864
1865 /* interface setup */
1866 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1867 {
1868         struct ieee80211_if_managed *ifmgd;
1869
1870         ifmgd = &sdata->u.mgd;
1871         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1872         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1873         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1874                     (unsigned long) sdata);
1875         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1876                     (unsigned long) sdata);
1877         skb_queue_head_init(&ifmgd->skb_queue);
1878
1879         ifmgd->capab = WLAN_CAPABILITY_ESS;
1880         ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
1881                 IEEE80211_AUTH_ALG_SHARED_KEY;
1882         ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
1883                 IEEE80211_STA_AUTO_BSSID_SEL |
1884                 IEEE80211_STA_AUTO_CHANNEL_SEL;
1885         if (sdata->local->hw.queues >= 4)
1886                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
1887 }
1888
1889 /* configuration hooks */
1890 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
1891 {
1892         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1893         struct ieee80211_local *local = sdata->local;
1894
1895         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1896                 return;
1897
1898         if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
1899                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
1900             (ifmgd->flags & (IEEE80211_STA_SSID_SET |
1901                              IEEE80211_STA_AUTO_SSID_SEL))) {
1902
1903                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
1904                         ieee80211_set_disassoc(sdata, true, true,
1905                                                WLAN_REASON_DEAUTH_LEAVING);
1906
1907                 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) ||
1908                     ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1909                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
1910                 else if (ifmgd->flags & IEEE80211_STA_EXT_SME)
1911                         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1912                 queue_work(local->hw.workqueue, &ifmgd->work);
1913         }
1914 }
1915
1916 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
1917 {
1918         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1919
1920         if (ifmgd->ssid_len)
1921                 ifmgd->flags |= IEEE80211_STA_SSID_SET;
1922         else
1923                 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
1924
1925         return 0;
1926 }
1927
1928 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
1929 {
1930         struct ieee80211_if_managed *ifmgd;
1931
1932         if (len > IEEE80211_MAX_SSID_LEN)
1933                 return -EINVAL;
1934
1935         ifmgd = &sdata->u.mgd;
1936
1937         if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
1938                 /*
1939                  * Do not use reassociation if SSID is changed (different ESS).
1940                  */
1941                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1942                 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
1943                 memcpy(ifmgd->ssid, ssid, len);
1944                 ifmgd->ssid_len = len;
1945         }
1946
1947         return ieee80211_sta_commit(sdata);
1948 }
1949
1950 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
1951 {
1952         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1953         memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
1954         *len = ifmgd->ssid_len;
1955         return 0;
1956 }
1957
1958 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
1959 {
1960         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1961
1962         if (is_valid_ether_addr(bssid)) {
1963                 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
1964                 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
1965         } else {
1966                 memset(ifmgd->bssid, 0, ETH_ALEN);
1967                 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
1968         }
1969
1970         if (netif_running(sdata->dev)) {
1971                 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
1972                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
1973                                "the low-level driver\n", sdata->dev->name);
1974                 }
1975         }
1976
1977         return ieee80211_sta_commit(sdata);
1978 }
1979
1980 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
1981                                const char *ie, size_t len)
1982 {
1983         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1984
1985         kfree(ifmgd->extra_ie);
1986         if (len == 0) {
1987                 ifmgd->extra_ie = NULL;
1988                 ifmgd->extra_ie_len = 0;
1989                 return 0;
1990         }
1991         ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
1992         if (!ifmgd->extra_ie) {
1993                 ifmgd->extra_ie_len = 0;
1994                 return -ENOMEM;
1995         }
1996         memcpy(ifmgd->extra_ie, ie, len);
1997         ifmgd->extra_ie_len = len;
1998         return 0;
1999 }
2000
2001 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2002 {
2003         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2004                sdata->dev->name, reason);
2005
2006         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2007                 return -EINVAL;
2008
2009         ieee80211_set_disassoc(sdata, true, true, reason);
2010         return 0;
2011 }
2012
2013 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2014 {
2015         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2016
2017         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2018                sdata->dev->name, reason);
2019
2020         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2021                 return -EINVAL;
2022
2023         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
2024                 return -ENOLINK;
2025
2026         ieee80211_set_disassoc(sdata, false, true, reason);
2027         return 0;
2028 }
2029
2030 /* scan finished notification */
2031 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2032 {
2033         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2034
2035         /* Restart STA timers */
2036         rcu_read_lock();
2037         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2038                 ieee80211_restart_sta_timer(sdata);
2039         rcu_read_unlock();
2040 }
2041
2042 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2043 {
2044         struct ieee80211_local *local =
2045                 container_of(work, struct ieee80211_local,
2046                              dynamic_ps_disable_work);
2047
2048         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2049                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2050                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2051         }
2052
2053         ieee80211_wake_queues_by_reason(&local->hw,
2054                                         IEEE80211_QUEUE_STOP_REASON_PS);
2055 }
2056
2057 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2058 {
2059         struct ieee80211_local *local =
2060                 container_of(work, struct ieee80211_local,
2061                              dynamic_ps_enable_work);
2062         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2063
2064         if (local->hw.conf.flags & IEEE80211_CONF_PS)
2065                 return;
2066
2067         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2068                 ieee80211_send_nullfunc(local, sdata, 1);
2069
2070         local->hw.conf.flags |= IEEE80211_CONF_PS;
2071         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2072 }
2073
2074 void ieee80211_dynamic_ps_timer(unsigned long data)
2075 {
2076         struct ieee80211_local *local = (void *) data;
2077
2078         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2079 }
2080
2081 void ieee80211_send_nullfunc(struct ieee80211_local *local,
2082                              struct ieee80211_sub_if_data *sdata,
2083                              int powersave)
2084 {
2085         struct sk_buff *skb;
2086         struct ieee80211_hdr *nullfunc;
2087         __le16 fc;
2088
2089         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2090                 return;
2091
2092         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
2093         if (!skb) {
2094                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2095                        "frame\n", sdata->dev->name);
2096                 return;
2097         }
2098         skb_reserve(skb, local->hw.extra_tx_headroom);
2099
2100         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
2101         memset(nullfunc, 0, 24);
2102         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
2103                          IEEE80211_FCTL_TODS);
2104         if (powersave)
2105                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
2106         nullfunc->frame_control = fc;
2107         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2108         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
2109         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2110
2111         ieee80211_tx_skb(sdata, skb, 0);
2112 }