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_IDLE_TIME (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 ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
  86 {
  87         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  88         struct ieee80211_local *local = sdata->local;
  89         struct sk_buff *skb;
  90         struct ieee80211_mgmt *mgmt;
  91         u8 *pos, *ies, *ht_ie;
  92         int i, len, count, rates_len, supp_rates_len;
  93         u16 capab;
  94         struct ieee80211_bss *bss;
  95         int wmm = 0;
  96         struct ieee80211_supported_band *sband;
  97         u32 rates = 0;
  98
  99         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 100                             sizeof(*mgmt) + 200 + ifmgd->extra_ie_len +
 101                             ifmgd->ssid_len);
 102         if (!skb) {
 103                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 104                        "frame\n", sdata->dev->name);
 105                 return;
 106         }
 107         skb_reserve(skb, local->hw.extra_tx_headroom);
 108
 109         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 110
 111         capab = ifmgd->capab;
 112
 113         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 114                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 115                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 116                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 117                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 118         }
 119
 120         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 121                                    local->hw.conf.channel->center_freq,
 122                                    ifmgd->ssid, ifmgd->ssid_len);
 123         if (bss) {
 124                 if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
 125                         capab |= WLAN_CAPABILITY_PRIVACY;
 126                 if (bss->wmm_used)
 127                         wmm = 1;
 128
 129                 /* get all rates supported by the device and the AP as
 130                  * some APs don't like getting a superset of their rates
 131                  * in the association request (e.g. D-Link DAP 1353 in
 132                  * b-only mode) */
 133                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 134
 135                 if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 136                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 137                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 138
 139                 ieee80211_rx_bss_put(local, bss);
 140         } else {
 141                 rates = ~0;
 142                 rates_len = sband->n_bitrates;
 143         }
 144
 145         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 146         memset(mgmt, 0, 24);
 147         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 148         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 149         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 150
 151         if (ifmgd->flags & IEEE80211_STA_PREV_BSSID_SET) {
 152                 skb_put(skb, 10);
 153                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 154                                                   IEEE80211_STYPE_REASSOC_REQ);
 155                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 156                 mgmt->u.reassoc_req.listen_interval =
 157                                 cpu_to_le16(local->hw.conf.listen_interval);
 158                 memcpy(mgmt->u.reassoc_req.current_ap, ifmgd->prev_bssid,
 159                        ETH_ALEN);
 160         } else {
 161                 skb_put(skb, 4);
 162                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 163                                                   IEEE80211_STYPE_ASSOC_REQ);
 164                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 165                 mgmt->u.assoc_req.listen_interval =
 166                                 cpu_to_le16(local->hw.conf.listen_interval);
 167         }
 168
 169         /* SSID */
 170         ies = pos = skb_put(skb, 2 + ifmgd->ssid_len);
 171         *pos++ = WLAN_EID_SSID;
 172         *pos++ = ifmgd->ssid_len;
 173         memcpy(pos, ifmgd->ssid, ifmgd->ssid_len);
 174
 175         /* add all rates which were marked to be used above */
 176         supp_rates_len = rates_len;
 177         if (supp_rates_len > 8)
 178                 supp_rates_len = 8;
 179
 180         len = sband->n_bitrates;
 181         pos = skb_put(skb, supp_rates_len + 2);
 182         *pos++ = WLAN_EID_SUPP_RATES;
 183         *pos++ = supp_rates_len;
 184
 185         count = 0;
 186         for (i = 0; i < sband->n_bitrates; i++) {
 187                 if (BIT(i) & rates) {
 188                         int rate = sband->bitrates[i].bitrate;
 189                         *pos++ = (u8) (rate / 5);
 190                         if (++count == 8)
 191                                 break;
 192                 }
 193         }
 194
 195         if (rates_len > count) {
 196                 pos = skb_put(skb, rates_len - count + 2);
 197                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 198                 *pos++ = rates_len - count;
 199
 200                 for (i++; i < sband->n_bitrates; i++) {
 201                         if (BIT(i) & rates) {
 202                                 int rate = sband->bitrates[i].bitrate;
 203                                 *pos++ = (u8) (rate / 5);
 204                         }
 205                 }
 206         }
 207
 208         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 209                 /* 1. power capabilities */
 210                 pos = skb_put(skb, 4);
 211                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 212                 *pos++ = 2;
 213                 *pos++ = 0; /* min tx power */
 214                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 215
 216                 /* 2. supported channels */
 217                 /* TODO: get this in reg domain format */
 218                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 219                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 220                 *pos++ = 2 * sband->n_channels;
 221                 for (i = 0; i < sband->n_channels; i++) {
 222                         *pos++ = ieee80211_frequency_to_channel(
 223                                         sband->channels[i].center_freq);
 224                         *pos++ = 1; /* one channel in the subband*/
 225                 }
 226         }
 227
 228         if (ifmgd->extra_ie) {
 229                 pos = skb_put(skb, ifmgd->extra_ie_len);
 230                 memcpy(pos, ifmgd->extra_ie, ifmgd->extra_ie_len);
 231         }
 232
 233         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
 234                 pos = skb_put(skb, 9);
 235                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 236                 *pos++ = 7; /* len */
 237                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 238                 *pos++ = 0x50;
 239                 *pos++ = 0xf2;
 240                 *pos++ = 2; /* WME */
 241                 *pos++ = 0; /* WME info */
 242                 *pos++ = 1; /* WME ver */
 243                 *pos++ = 0;
 244         }
 245
 246         /* wmm support is a must to HT */
 247         /*
 248          * IEEE802.11n does not allow TKIP/WEP as pairwise
 249          * ciphers in HT mode. We still associate in non-ht
 250          * mode (11a/b/g) if any one of these ciphers is
 251          * configured as pairwise.
 252          */
 253         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
 254             sband->ht_cap.ht_supported &&
 255             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
 256             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 257             (!(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))) {
 258                 struct ieee80211_ht_info *ht_info =
 259                         (struct ieee80211_ht_info *)(ht_ie + 2);
 260                 u16 cap = sband->ht_cap.cap;
 261                 __le16 tmp;
 262                 u32 flags = local->hw.conf.channel->flags;
 263
 264                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 265                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 266                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 267                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 268                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 269                         }
 270                         break;
 271                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 272                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 273                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 274                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 275                         }
 276                         break;
 277                 }
 278
 279                 tmp = cpu_to_le16(cap);
 280                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 281                 *pos++ = WLAN_EID_HT_CAPABILITY;
 282                 *pos++ = sizeof(struct ieee80211_ht_cap);
 283                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 284                 memcpy(pos, &tmp, sizeof(u16));
 285                 pos += sizeof(u16);
 286                 /* TODO: needs a define here for << 2 */
 287                 *pos++ = sband->ht_cap.ampdu_factor |
 288                          (sband->ht_cap.ampdu_density << 2);
 289                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 290         }
 291
 292         kfree(ifmgd->assocreq_ies);
 293         ifmgd->assocreq_ies_len = (skb->data + skb->len) - ies;
 294         ifmgd->assocreq_ies = kmalloc(ifmgd->assocreq_ies_len, GFP_KERNEL);
 295         if (ifmgd->assocreq_ies)
 296                 memcpy(ifmgd->assocreq_ies, ies, ifmgd->assocreq_ies_len);
 297
 298         ieee80211_tx_skb(sdata, skb, 0);
 299 }
 300
 301
 302 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 303                                            u16 stype, u16 reason)
 304 {
 305         struct ieee80211_local *local = sdata->local;
 306         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 307         struct sk_buff *skb;
 308         struct ieee80211_mgmt *mgmt;
 309
 310         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 311         if (!skb) {
 312                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 313                        "deauth/disassoc frame\n", sdata->dev->name);
 314                 return;
 315         }
 316         skb_reserve(skb, local->hw.extra_tx_headroom);
 317
 318         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 319         memset(mgmt, 0, 24);
 320         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 321         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 322         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 323         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 324         skb_put(skb, 2);
 325         /* u.deauth.reason_code == u.disassoc.reason_code */
 326         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 327
 328         ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
 329 }
 330
 331 void ieee80211_send_pspoll(struct ieee80211_local *local,
 332                            struct ieee80211_sub_if_data *sdata)
 333 {
 334         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 335         struct ieee80211_pspoll *pspoll;
 336         struct sk_buff *skb;
 337         u16 fc;
 338
 339         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 340         if (!skb) {
 341                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 342                        "pspoll frame\n", sdata->dev->name);
 343                 return;
 344         }
 345         skb_reserve(skb, local->hw.extra_tx_headroom);
 346
 347         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 348         memset(pspoll, 0, sizeof(*pspoll));
 349         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 350         pspoll->frame_control = cpu_to_le16(fc);
 351         pspoll->aid = cpu_to_le16(ifmgd->aid);
 352
 353         /* aid in PS-Poll has its two MSBs each set to 1 */
 354         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 355
 356         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
 357         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
 358
 359         ieee80211_tx_skb(sdata, skb, 0);
 360 }
 361
 362 /* MLME */
 363 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 364                                      struct ieee80211_if_managed *ifmgd,
 365                                      u8 *wmm_param, size_t wmm_param_len)
 366 {
 367         struct ieee80211_tx_queue_params params;
 368         size_t left;
 369         int count;
 370         u8 *pos;
 371
 372         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
 373                 return;
 374
 375         if (!wmm_param)
 376                 return;
 377
 378         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 379                 return;
 380         count = wmm_param[6] & 0x0f;
 381         if (count == ifmgd->wmm_last_param_set)
 382                 return;
 383         ifmgd->wmm_last_param_set = count;
 384
 385         pos = wmm_param + 8;
 386         left = wmm_param_len - 8;
 387
 388         memset(&params, 0, sizeof(params));
 389
 390         local->wmm_acm = 0;
 391         for (; left >= 4; left -= 4, pos += 4) {
 392                 int aci = (pos[0] >> 5) & 0x03;
 393                 int acm = (pos[0] >> 4) & 0x01;
 394                 int queue;
 395
 396                 switch (aci) {
 397                 case 1: /* AC_BK */
 398                         queue = 3;
 399                         if (acm)
 400                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 401                         break;
 402                 case 2: /* AC_VI */
 403                         queue = 1;
 404                         if (acm)
 405                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 406                         break;
 407                 case 3: /* AC_VO */
 408                         queue = 0;
 409                         if (acm)
 410                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 411                         break;
 412                 case 0: /* AC_BE */
 413                 default:
 414                         queue = 2;
 415                         if (acm)
 416                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 417                         break;
 418                 }
 419
 420                 params.aifs = pos[0] & 0x0f;
 421                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 422                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 423                 params.txop = get_unaligned_le16(pos + 2);
 424 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 425                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 426                        "cWmin=%d cWmax=%d txop=%d\n",
 427                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 428                        params.cw_max, params.txop);
 429 #endif
 430                 if (local->ops->conf_tx &&
 431                     local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 432                         printk(KERN_DEBUG "%s: failed to set TX queue "
 433                                "parameters for queue %d\n", local->mdev->name, queue);
 434                 }
 435         }
 436 }
 437
 438 static bool ieee80211_check_tim(struct ieee802_11_elems *elems, u16 aid)
 439 {
 440         u8 mask;
 441         u8 index, indexn1, indexn2;
 442         struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
 443
 444         aid &= 0x3fff;
 445         index = aid / 8;
 446         mask  = 1 << (aid & 7);
 447
 448         indexn1 = tim->bitmap_ctrl & 0xfe;
 449         indexn2 = elems->tim_len + indexn1 - 4;
 450
 451         if (index < indexn1 || index > indexn2)
 452                 return false;
 453
 454         index -= indexn1;
 455
 456         return !!(tim->virtual_map[index] & mask);
 457 }
 458
 459 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 460                                            u16 capab, bool erp_valid, u8 erp)
 461 {
 462         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 463 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 464         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 465 #endif
 466         u32 changed = 0;
 467         bool use_protection;
 468         bool use_short_preamble;
 469         bool use_short_slot;
 470
 471         if (erp_valid) {
 472                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 473                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 474         } else {
 475                 use_protection = false;
 476                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 477         }
 478
 479         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 480
 481         if (use_protection != bss_conf->use_cts_prot) {
 482 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 483                 if (net_ratelimit()) {
 484                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 485                                sdata->dev->name,
 486                                use_protection ? "enabled" : "disabled",
 487                                ifmgd->bssid);
 488                 }
 489 #endif
 490                 bss_conf->use_cts_prot = use_protection;
 491                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 492         }
 493
 494         if (use_short_preamble != bss_conf->use_short_preamble) {
 495 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 496                 if (net_ratelimit()) {
 497                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 498                                " (BSSID=%pM)\n",
 499                                sdata->dev->name,
 500                                use_short_preamble ? "short" : "long",
 501                                ifmgd->bssid);
 502                 }
 503 #endif
 504                 bss_conf->use_short_preamble = use_short_preamble;
 505                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 506         }
 507
 508         if (use_short_slot != bss_conf->use_short_slot) {
 509 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 510                 if (net_ratelimit()) {
 511                         printk(KERN_DEBUG "%s: switched to %s slot time"
 512                                " (BSSID=%pM)\n",
 513                                sdata->dev->name,
 514                                use_short_slot ? "short" : "long",
 515                                ifmgd->bssid);
 516                 }
 517 #endif
 518                 bss_conf->use_short_slot = use_short_slot;
 519                 changed |= BSS_CHANGED_ERP_SLOT;
 520         }
 521
 522         return changed;
 523 }
 524
 525 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata)
 526 {
 527         union iwreq_data wrqu;
 528
 529         memset(&wrqu, 0, sizeof(wrqu));
 530         if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED)
 531                 memcpy(wrqu.ap_addr.sa_data, sdata->u.mgd.bssid, ETH_ALEN);
 532         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 533         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 534 }
 535
 536 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata)
 537 {
 538         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 539         char *buf;
 540         size_t len;
 541         int i;
 542         union iwreq_data wrqu;
 543
 544         if (!ifmgd->assocreq_ies && !ifmgd->assocresp_ies)
 545                 return;
 546
 547         buf = kmalloc(50 + 2 * (ifmgd->assocreq_ies_len +
 548                                 ifmgd->assocresp_ies_len), GFP_KERNEL);
 549         if (!buf)
 550                 return;
 551
 552         len = sprintf(buf, "ASSOCINFO(");
 553         if (ifmgd->assocreq_ies) {
 554                 len += sprintf(buf + len, "ReqIEs=");
 555                 for (i = 0; i < ifmgd->assocreq_ies_len; i++) {
 556                         len += sprintf(buf + len, "%02x",
 557                                        ifmgd->assocreq_ies[i]);
 558                 }
 559         }
 560         if (ifmgd->assocresp_ies) {
 561                 if (ifmgd->assocreq_ies)
 562                         len += sprintf(buf + len, " ");
 563                 len += sprintf(buf + len, "RespIEs=");
 564                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 565                         len += sprintf(buf + len, "%02x",
 566                                        ifmgd->assocresp_ies[i]);
 567                 }
 568         }
 569         len += sprintf(buf + len, ")");
 570
 571         if (len > IW_CUSTOM_MAX) {
 572                 len = sprintf(buf, "ASSOCRESPIE=");
 573                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 574                         len += sprintf(buf + len, "%02x",
 575                                        ifmgd->assocresp_ies[i]);
 576                 }
 577         }
 578
 579         if (len <= IW_CUSTOM_MAX) {
 580                 memset(&wrqu, 0, sizeof(wrqu));
 581                 wrqu.data.length = len;
 582                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 583         }
 584
 585         kfree(buf);
 586 }
 587
 588
 589 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 590                                      u32 bss_info_changed)
 591 {
 592         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 593         struct ieee80211_local *local = sdata->local;
 594         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 595
 596         struct ieee80211_bss *bss;
 597
 598         bss_info_changed |= BSS_CHANGED_ASSOC;
 599         ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
 600
 601         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 602                                    conf->channel->center_freq,
 603                                    ifmgd->ssid, ifmgd->ssid_len);
 604         if (bss) {
 605                 /* set timing information */
 606                 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 607                 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 608                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 609
 610                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 611                         bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 612
 613                 ieee80211_rx_bss_put(local, bss);
 614         }
 615
 616         ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
 617         memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
 618         ieee80211_sta_send_associnfo(sdata);
 619
 620         ifmgd->last_probe = jiffies;
 621         ieee80211_led_assoc(local, 1);
 622
 623         sdata->vif.bss_conf.assoc = 1;
 624         /*
 625          * For now just always ask the driver to update the basic rateset
 626          * when we have associated, we aren't checking whether it actually
 627          * changed or not.
 628          */
 629         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 630         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 631
 632         if (local->powersave) {
 633                 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
 634                     local->hw.conf.dynamic_ps_timeout > 0) {
 635                         mod_timer(&local->dynamic_ps_timer, jiffies +
 636                                   msecs_to_jiffies(
 637                                         local->hw.conf.dynamic_ps_timeout));
 638                 } else {
 639                         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 640                                 ieee80211_send_nullfunc(local, sdata, 1);
 641                         conf->flags |= IEEE80211_CONF_PS;
 642                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 643                 }
 644         }
 645
 646         netif_tx_start_all_queues(sdata->dev);
 647         netif_carrier_on(sdata->dev);
 648
 649         ieee80211_sta_send_apinfo(sdata);
 650 }
 651
 652 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
 653 {
 654         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 655         struct ieee80211_local *local = sdata->local;
 656
 657         ifmgd->direct_probe_tries++;
 658         if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 659                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 660                        sdata->dev->name, ifmgd->bssid);
 661                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 662                 ieee80211_sta_send_apinfo(sdata);
 663
 664                 /*
 665                  * Most likely AP is not in the range so remove the
 666                  * bss information associated to the AP
 667                  */
 668                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 669                                 sdata->local->hw.conf.channel->center_freq,
 670                                 ifmgd->ssid, ifmgd->ssid_len);
 671
 672                 /*
 673                  * We might have a pending scan which had no chance to run yet
 674                  * due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
 675                  * Hence, queue the STAs work again
 676                  */
 677                 queue_work(local->hw.workqueue, &ifmgd->work);
 678                 return;
 679         }
 680
 681         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 682                         sdata->dev->name, ifmgd->bssid,
 683                         ifmgd->direct_probe_tries);
 684
 685         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 686
 687         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifmgd->request);
 688
 689         /* Direct probe is sent to broadcast address as some APs
 690          * will not answer to direct packet in unassociated state.
 691          */
 692         ieee80211_send_probe_req(sdata, NULL,
 693                                  ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
 694
 695         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 696 }
 697
 698
 699 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
 700 {
 701         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 702         struct ieee80211_local *local = sdata->local;
 703         u8 *ies;
 704         size_t ies_len;
 705
 706         ifmgd->auth_tries++;
 707         if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 708                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 709                        " timed out\n",
 710                        sdata->dev->name, ifmgd->bssid);
 711                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 712                 ieee80211_sta_send_apinfo(sdata);
 713                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 714                                 sdata->local->hw.conf.channel->center_freq,
 715                                 ifmgd->ssid, ifmgd->ssid_len);
 716
 717                 /*
 718                  * We might have a pending scan which had no chance to run yet
 719                  * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
 720                  * Hence, queue the STAs work again
 721                  */
 722                 queue_work(local->hw.workqueue, &ifmgd->work);
 723                 return;
 724         }
 725
 726         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
 727         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 728                sdata->dev->name, ifmgd->bssid);
 729
 730         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
 731                 ies = ifmgd->sme_auth_ie;
 732                 ies_len = ifmgd->sme_auth_ie_len;
 733         } else {
 734                 ies = NULL;
 735                 ies_len = 0;
 736         }
 737         ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len,
 738                             ifmgd->bssid, 0);
 739         ifmgd->auth_transaction = 2;
 740
 741         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 742 }
 743
 744 /*
 745  * The disassoc 'reason' argument can be either our own reason
 746  * if self disconnected or a reason code from the AP.
 747  */
 748 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 749                                    bool deauth, bool self_disconnected,
 750                                    u16 reason)
 751 {
 752         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 753         struct ieee80211_local *local = sdata->local;
 754         struct sta_info *sta;
 755         u32 changed = 0, config_changed = 0;
 756
 757         rcu_read_lock();
 758
 759         sta = sta_info_get(local, ifmgd->bssid);
 760         if (!sta) {
 761                 rcu_read_unlock();
 762                 return;
 763         }
 764
 765         if (deauth) {
 766                 ifmgd->direct_probe_tries = 0;
 767                 ifmgd->auth_tries = 0;
 768         }
 769         ifmgd->assoc_scan_tries = 0;
 770         ifmgd->assoc_tries = 0;
 771
 772         netif_tx_stop_all_queues(sdata->dev);
 773         netif_carrier_off(sdata->dev);
 774
 775         ieee80211_sta_tear_down_BA_sessions(sta);
 776
 777         if (self_disconnected) {
 778                 if (deauth)
 779                         ieee80211_send_deauth_disassoc(sdata,
 780                                 IEEE80211_STYPE_DEAUTH, reason);
 781                 else
 782                         ieee80211_send_deauth_disassoc(sdata,
 783                                 IEEE80211_STYPE_DISASSOC, reason);
 784         }
 785
 786         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
 787         changed |= ieee80211_reset_erp_info(sdata);
 788
 789         ieee80211_led_assoc(local, 0);
 790         changed |= BSS_CHANGED_ASSOC;
 791         sdata->vif.bss_conf.assoc = false;
 792
 793         ieee80211_sta_send_apinfo(sdata);
 794
 795         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
 796                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 797                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 798                                 sdata->local->hw.conf.channel->center_freq,
 799                                 ifmgd->ssid, ifmgd->ssid_len);
 800         }
 801
 802         rcu_read_unlock();
 803
 804         /* channel(_type) changes are handled by ieee80211_hw_config */
 805         local->oper_channel_type = NL80211_CHAN_NO_HT;
 806
 807         local->power_constr_level = 0;
 808
 809         del_timer_sync(&local->dynamic_ps_timer);
 810         cancel_work_sync(&local->dynamic_ps_enable_work);
 811
 812         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 813                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 814                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 815         }
 816
 817         ieee80211_hw_config(local, config_changed);
 818         ieee80211_bss_info_change_notify(sdata, changed);
 819
 820         rcu_read_lock();
 821
 822         sta = sta_info_get(local, ifmgd->bssid);
 823         if (!sta) {
 824                 rcu_read_unlock();
 825                 return;
 826         }
 827
 828         sta_info_unlink(&sta);
 829
 830         rcu_read_unlock();
 831
 832         sta_info_destroy(sta);
 833 }
 834
 835 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
 836 {
 837         if (!sdata || !sdata->default_key ||
 838             sdata->default_key->conf.alg != ALG_WEP)
 839                 return 0;
 840         return 1;
 841 }
 842
 843 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
 844 {
 845         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 846         struct ieee80211_local *local = sdata->local;
 847         struct ieee80211_bss *bss;
 848         int bss_privacy;
 849         int wep_privacy;
 850         int privacy_invoked;
 851
 852         if (!ifmgd || (ifmgd->flags & IEEE80211_STA_EXT_SME))
 853                 return 0;
 854
 855         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 856                                    local->hw.conf.channel->center_freq,
 857                                    ifmgd->ssid, ifmgd->ssid_len);
 858         if (!bss)
 859                 return 0;
 860
 861         bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
 862         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
 863         privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
 864
 865         ieee80211_rx_bss_put(local, bss);
 866
 867         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
 868                 return 0;
 869
 870         return 1;
 871 }
 872
 873 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
 874 {
 875         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 876         struct ieee80211_local *local = sdata->local;
 877
 878         ifmgd->assoc_tries++;
 879         if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 880                 printk(KERN_DEBUG "%s: association with AP %pM"
 881                        " timed out\n",
 882                        sdata->dev->name, ifmgd->bssid);
 883                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 884                 ieee80211_sta_send_apinfo(sdata);
 885                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 886                                 sdata->local->hw.conf.channel->center_freq,
 887                                 ifmgd->ssid, ifmgd->ssid_len);
 888                 /*
 889                  * We might have a pending scan which had no chance to run yet
 890                  * due to state == IEEE80211_STA_MLME_ASSOCIATE.
 891                  * Hence, queue the STAs work again
 892                  */
 893                 queue_work(local->hw.workqueue, &ifmgd->work);
 894                 return;
 895         }
 896
 897         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
 898         printk(KERN_DEBUG "%s: associate with AP %pM\n",
 899                sdata->dev->name, ifmgd->bssid);
 900         if (ieee80211_privacy_mismatch(sdata)) {
 901                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 902                        "mixed-cell disabled - abort association\n", sdata->dev->name);
 903                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 904                 return;
 905         }
 906
 907         ieee80211_send_assoc(sdata);
 908
 909         mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 910 }
 911
 912 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 913                              struct ieee80211_hdr *hdr)
 914 {
 915         /*
 916          * We can postpone the mgd.timer whenever receiving unicast frames
 917          * from AP because we know that the connection is working both ways
 918          * at that time. But multicast frames (and hence also beacons) must
 919          * be ignored here, because we need to trigger the timer during
 920          * data idle periods for sending the periodical probe request to
 921          * the AP.
 922          */
 923         if (!is_multicast_ether_addr(hdr->addr1))
 924                 mod_timer(&sdata->u.mgd.timer,
 925                           jiffies + IEEE80211_MONITORING_INTERVAL);
 926 }
 927
 928 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
 929 {
 930         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 931         struct ieee80211_local *local = sdata->local;
 932         struct sta_info *sta;
 933         bool disassoc = false;
 934
 935         /* TODO: start monitoring current AP signal quality and number of
 936          * missed beacons. Scan other channels every now and then and search
 937          * for better APs. */
 938         /* TODO: remove expired BSSes */
 939
 940         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
 941
 942         rcu_read_lock();
 943
 944         sta = sta_info_get(local, ifmgd->bssid);
 945         if (!sta) {
 946                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
 947                        sdata->dev->name, ifmgd->bssid);
 948                 disassoc = true;
 949                 goto unlock;
 950         }
 951
 952         if ((ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) &&
 953             time_after(jiffies, sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 954                 printk(KERN_DEBUG "%s: no probe response from AP %pM "
 955                        "- disassociating\n",
 956                        sdata->dev->name, ifmgd->bssid);
 957                 disassoc = true;
 958                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
 959                 goto unlock;
 960         }
 961
 962         if (time_after(jiffies,
 963                        ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) {
 964                 printk(KERN_DEBUG "%s: beacon loss from AP %pM "
 965                        "- sending probe request\n",
 966                        sdata->dev->name, ifmgd->bssid);
 967                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
 968                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
 969                                          ifmgd->ssid_len, NULL, 0);
 970                 goto unlock;
 971
 972         }
 973
 974         if (time_after(jiffies, sta->last_rx + IEEE80211_PROBE_IDLE_TIME)) {
 975                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
 976                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
 977                                          ifmgd->ssid_len, NULL, 0);
 978         }
 979
 980  unlock:
 981         rcu_read_unlock();
 982
 983         if (disassoc)
 984                 ieee80211_set_disassoc(sdata, true, true,
 985                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
 986         else
 987                 mod_timer(&ifmgd->timer, jiffies +
 988                                       IEEE80211_MONITORING_INTERVAL);
 989 }
 990
 991
 992 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
 993 {
 994         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 995
 996         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
 997         ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
 998         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
 999                 /* Wait for SME to request association */
1000                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1001         } else
1002                 ieee80211_associate(sdata);
1003 }
1004
1005
1006 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1007                                      struct ieee80211_mgmt *mgmt,
1008                                      size_t len)
1009 {
1010         u8 *pos;
1011         struct ieee802_11_elems elems;
1012
1013         pos = mgmt->u.auth.variable;
1014         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1015         if (!elems.challenge)
1016                 return;
1017         ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
1018                             elems.challenge - 2, elems.challenge_len + 2,
1019                             sdata->u.mgd.bssid, 1);
1020         sdata->u.mgd.auth_transaction = 4;
1021 }
1022
1023 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1024                                    struct ieee80211_mgmt *mgmt,
1025                                    size_t len)
1026 {
1027         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1028         u16 auth_alg, auth_transaction, status_code;
1029
1030         if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1031                 return;
1032
1033         if (len < 24 + 6)
1034                 return;
1035
1036         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1037                 return;
1038
1039         if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1040                 return;
1041
1042         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1043         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1044         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1045
1046         if (auth_alg != ifmgd->auth_alg ||
1047             auth_transaction != ifmgd->auth_transaction)
1048                 return;
1049
1050         if (status_code != WLAN_STATUS_SUCCESS) {
1051                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1052                         u8 algs[3];
1053                         const int num_algs = ARRAY_SIZE(algs);
1054                         int i, pos;
1055                         algs[0] = algs[1] = algs[2] = 0xff;
1056                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1057                                 algs[0] = WLAN_AUTH_OPEN;
1058                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1059                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1060                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1061                                 algs[2] = WLAN_AUTH_LEAP;
1062                         if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1063                                 pos = 0;
1064                         else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1065                                 pos = 1;
1066                         else
1067                                 pos = 2;
1068                         for (i = 0; i < num_algs; i++) {
1069                                 pos++;
1070                                 if (pos >= num_algs)
1071                                         pos = 0;
1072                                 if (algs[pos] == ifmgd->auth_alg ||
1073                                     algs[pos] == 0xff)
1074                                         continue;
1075                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1076                                     !ieee80211_sta_wep_configured(sdata))
1077                                         continue;
1078                                 ifmgd->auth_alg = algs[pos];
1079                                 break;
1080                         }
1081                 }
1082                 return;
1083         }
1084
1085         switch (ifmgd->auth_alg) {
1086         case WLAN_AUTH_OPEN:
1087         case WLAN_AUTH_LEAP:
1088         case WLAN_AUTH_FT:
1089                 ieee80211_auth_completed(sdata);
1090                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1091                 break;
1092         case WLAN_AUTH_SHARED_KEY:
1093                 if (ifmgd->auth_transaction == 4) {
1094                         ieee80211_auth_completed(sdata);
1095                         cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1096                 } else
1097                         ieee80211_auth_challenge(sdata, mgmt, len);
1098                 break;
1099         }
1100 }
1101
1102
1103 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1104                                      struct ieee80211_mgmt *mgmt,
1105                                      size_t len)
1106 {
1107         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1108         u16 reason_code;
1109
1110         if (len < 24 + 2)
1111                 return;
1112
1113         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1114                 return;
1115
1116         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1117
1118         if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1119                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1120                                 sdata->dev->name, reason_code);
1121
1122         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1123             (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1124              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1125              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)) {
1126                 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1127                 mod_timer(&ifmgd->timer, jiffies +
1128                                       IEEE80211_RETRY_AUTH_INTERVAL);
1129         }
1130
1131         ieee80211_set_disassoc(sdata, true, false, 0);
1132         ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1133         cfg80211_send_rx_deauth(sdata->dev, (u8 *) mgmt, len);
1134 }
1135
1136
1137 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1138                                        struct ieee80211_mgmt *mgmt,
1139                                        size_t len)
1140 {
1141         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1142         u16 reason_code;
1143
1144         if (len < 24 + 2)
1145                 return;
1146
1147         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1148                 return;
1149
1150         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1151
1152         if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1153                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1154                                 sdata->dev->name, reason_code);
1155
1156         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1157             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1158                 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1159                 mod_timer(&ifmgd->timer, jiffies +
1160                                       IEEE80211_RETRY_AUTH_INTERVAL);
1161         }
1162
1163         ieee80211_set_disassoc(sdata, false, false, reason_code);
1164         cfg80211_send_rx_disassoc(sdata->dev, (u8 *) mgmt, len);
1165 }
1166
1167
1168 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1169                                          struct ieee80211_mgmt *mgmt,
1170                                          size_t len,
1171                                          int reassoc)
1172 {
1173         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1174         struct ieee80211_local *local = sdata->local;
1175         struct ieee80211_supported_band *sband;
1176         struct sta_info *sta;
1177         u32 rates, basic_rates;
1178         u16 capab_info, status_code, aid;
1179         struct ieee802_11_elems elems;
1180         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1181         u8 *pos;
1182         u32 changed = 0;
1183         int i, j;
1184         bool have_higher_than_11mbit = false, newsta = false;
1185         u16 ap_ht_cap_flags;
1186
1187         /* AssocResp and ReassocResp have identical structure, so process both
1188          * of them in this function. */
1189
1190         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1191                 return;
1192
1193         if (len < 24 + 6)
1194                 return;
1195
1196         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1197                 return;
1198
1199         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1200         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1201         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1202
1203         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1204                "status=%d aid=%d)\n",
1205                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1206                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1207
1208         pos = mgmt->u.assoc_resp.variable;
1209         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1210
1211         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1212             elems.timeout_int && elems.timeout_int_len == 5 &&
1213             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1214                 u32 tu, ms;
1215                 tu = get_unaligned_le32(elems.timeout_int + 1);
1216                 ms = tu * 1024 / 1000;
1217                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1218                        "comeback duration %u TU (%u ms)\n",
1219                        sdata->dev->name, tu, ms);
1220                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1221                         mod_timer(&ifmgd->timer,
1222                                   jiffies + msecs_to_jiffies(ms));
1223                 return;
1224         }
1225
1226         if (status_code != WLAN_STATUS_SUCCESS) {
1227                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1228                        sdata->dev->name, status_code);
1229                 /* if this was a reassociation, ensure we try a "full"
1230                  * association next time. This works around some broken APs
1231                  * which do not correctly reject reassociation requests. */
1232                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1233                 return;
1234         }
1235
1236         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1237                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1238                        "set\n", sdata->dev->name, aid);
1239         aid &= ~(BIT(15) | BIT(14));
1240
1241         if (!elems.supp_rates) {
1242                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1243                        sdata->dev->name);
1244                 return;
1245         }
1246
1247         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1248         ifmgd->aid = aid;
1249         ifmgd->ap_capab = capab_info;
1250
1251         kfree(ifmgd->assocresp_ies);
1252         ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1253         ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1254         if (ifmgd->assocresp_ies)
1255                 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1256
1257         rcu_read_lock();
1258
1259         /* Add STA entry for the AP */
1260         sta = sta_info_get(local, ifmgd->bssid);
1261         if (!sta) {
1262                 newsta = true;
1263
1264                 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1265                 if (!sta) {
1266                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1267                                " the AP\n", sdata->dev->name);
1268                         rcu_read_unlock();
1269                         return;
1270                 }
1271
1272                 /* update new sta with its last rx activity */
1273                 sta->last_rx = jiffies;
1274         }
1275
1276         /*
1277          * FIXME: Do we really need to update the sta_info's information here?
1278          *        We already know about the AP (we found it in our list) so it
1279          *        should already be filled with the right info, no?
1280          *        As is stands, all this is racy because typically we assume
1281          *        the information that is filled in here (except flags) doesn't
1282          *        change while a STA structure is alive. As such, it should move
1283          *        to between the sta_info_alloc() and sta_info_insert() above.
1284          */
1285
1286         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1287                            WLAN_STA_AUTHORIZED);
1288
1289         rates = 0;
1290         basic_rates = 0;
1291         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1292
1293         for (i = 0; i < elems.supp_rates_len; i++) {
1294                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1295                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1296
1297                 if (rate > 110)
1298                         have_higher_than_11mbit = true;
1299
1300                 for (j = 0; j < sband->n_bitrates; j++) {
1301                         if (sband->bitrates[j].bitrate == rate) {
1302                                 rates |= BIT(j);
1303                                 if (is_basic)
1304                                         basic_rates |= BIT(j);
1305                                 break;
1306                         }
1307                 }
1308         }
1309
1310         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1311                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1312                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1313
1314                 if (rate > 110)
1315                         have_higher_than_11mbit = true;
1316
1317                 for (j = 0; j < sband->n_bitrates; j++) {
1318                         if (sband->bitrates[j].bitrate == rate) {
1319                                 rates |= BIT(j);
1320                                 if (is_basic)
1321                                         basic_rates |= BIT(j);
1322                                 break;
1323                         }
1324                 }
1325         }
1326
1327         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1328         sdata->vif.bss_conf.basic_rates = basic_rates;
1329
1330         /* cf. IEEE 802.11 9.2.12 */
1331         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1332             have_higher_than_11mbit)
1333                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1334         else
1335                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1336
1337         /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1338         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1339                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1340                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1341
1342         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1343
1344         rate_control_rate_init(sta);
1345
1346         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1347                 set_sta_flags(sta, WLAN_STA_MFP);
1348
1349         if (elems.wmm_param)
1350                 set_sta_flags(sta, WLAN_STA_WME);
1351
1352         if (newsta) {
1353                 int err = sta_info_insert(sta);
1354                 if (err) {
1355                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1356                                " the AP (error %d)\n", sdata->dev->name, err);
1357                         rcu_read_unlock();
1358                         return;
1359                 }
1360         }
1361
1362         rcu_read_unlock();
1363
1364         if (elems.wmm_param)
1365                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1366                                          elems.wmm_param_len);
1367
1368         if (elems.ht_info_elem && elems.wmm_param &&
1369             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1370             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1371                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1372                                                ap_ht_cap_flags);
1373
1374         /* set AID and assoc capability,
1375          * ieee80211_set_associated() will tell the driver */
1376         bss_conf->aid = aid;
1377         bss_conf->assoc_capability = capab_info;
1378         ieee80211_set_associated(sdata, changed);
1379
1380         /*
1381          * initialise the time of last beacon to be the association time,
1382          * otherwise beacon loss check will trigger immediately
1383          */
1384         ifmgd->last_beacon = jiffies;
1385
1386         ieee80211_associated(sdata);
1387         cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1388 }
1389
1390
1391 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1392                                   struct ieee80211_mgmt *mgmt,
1393                                   size_t len,
1394                                   struct ieee80211_rx_status *rx_status,
1395                                   struct ieee802_11_elems *elems,
1396                                   bool beacon)
1397 {
1398         struct ieee80211_local *local = sdata->local;
1399         int freq;
1400         struct ieee80211_bss *bss;
1401         struct ieee80211_channel *channel;
1402
1403         if (elems->ds_params && elems->ds_params_len == 1)
1404                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1405         else
1406                 freq = rx_status->freq;
1407
1408         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1409
1410         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1411                 return;
1412
1413         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1414                                         channel, beacon);
1415         if (!bss)
1416                 return;
1417
1418         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1419             (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1420                 struct ieee80211_channel_sw_ie *sw_elem =
1421                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1422                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1423         }
1424
1425         ieee80211_rx_bss_put(local, bss);
1426 }
1427
1428
1429 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1430                                          struct ieee80211_mgmt *mgmt,
1431                                          size_t len,
1432                                          struct ieee80211_rx_status *rx_status)
1433 {
1434         struct ieee80211_if_managed *ifmgd;
1435         size_t baselen;
1436         struct ieee802_11_elems elems;
1437
1438         ifmgd = &sdata->u.mgd;
1439
1440         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1441                 return; /* ignore ProbeResp to foreign address */
1442
1443         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1444         if (baselen > len)
1445                 return;
1446
1447         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1448                                 &elems);
1449
1450         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1451
1452         /* direct probe may be part of the association flow */
1453         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1454                                &ifmgd->request)) {
1455                 printk(KERN_DEBUG "%s direct probe responded\n",
1456                        sdata->dev->name);
1457                 ieee80211_authenticate(sdata);
1458         }
1459
1460         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1461                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1462 }
1463
1464 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1465                                      struct ieee80211_mgmt *mgmt,
1466                                      size_t len,
1467                                      struct ieee80211_rx_status *rx_status)
1468 {
1469         struct ieee80211_if_managed *ifmgd;
1470         size_t baselen;
1471         struct ieee802_11_elems elems;
1472         struct ieee80211_local *local = sdata->local;
1473         u32 changed = 0;
1474         bool erp_valid, directed_tim;
1475         u8 erp_value = 0;
1476
1477         /* Process beacon from the current BSS */
1478         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1479         if (baselen > len)
1480                 return;
1481
1482         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1483
1484         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1485
1486         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1487                 return;
1488
1489         ifmgd = &sdata->u.mgd;
1490
1491         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1492             memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1493                 return;
1494
1495         if (rx_status->freq != local->hw.conf.channel->center_freq)
1496                 return;
1497
1498         ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1499                                  elems.wmm_param_len);
1500
1501         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1502                 directed_tim = ieee80211_check_tim(&elems, ifmgd->aid);
1503
1504                 if (directed_tim) {
1505                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1506                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1507                                 ieee80211_hw_config(local,
1508                                                     IEEE80211_CONF_CHANGE_PS);
1509                                 ieee80211_send_nullfunc(local, sdata, 0);
1510                         } else {
1511                                 local->pspolling = true;
1512
1513                                 /*
1514                                  * Here is assumed that the driver will be
1515                                  * able to send ps-poll frame and receive a
1516                                  * response even though power save mode is
1517                                  * enabled, but some drivers might require
1518                                  * to disable power save here. This needs
1519                                  * to be investigated.
1520                                  */
1521                                 ieee80211_send_pspoll(local, sdata);
1522                         }
1523                 }
1524         }
1525
1526         if (elems.erp_info && elems.erp_info_len >= 1) {
1527                 erp_valid = true;
1528                 erp_value = elems.erp_info[0];
1529         } else {
1530                 erp_valid = false;
1531         }
1532         changed |= ieee80211_handle_bss_capability(sdata,
1533                         le16_to_cpu(mgmt->u.beacon.capab_info),
1534                         erp_valid, erp_value);
1535
1536
1537         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1538             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
1539                 struct sta_info *sta;
1540                 struct ieee80211_supported_band *sband;
1541                 u16 ap_ht_cap_flags;
1542
1543                 rcu_read_lock();
1544
1545                 sta = sta_info_get(local, ifmgd->bssid);
1546                 if (!sta) {
1547                         rcu_read_unlock();
1548                         return;
1549                 }
1550
1551                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1552
1553                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1554                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1555
1556                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1557
1558                 rcu_read_unlock();
1559
1560                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1561                                                ap_ht_cap_flags);
1562         }
1563
1564         if (elems.country_elem) {
1565                 /* Note we are only reviewing this on beacons
1566                  * for the BSSID we are associated to */
1567                 regulatory_hint_11d(local->hw.wiphy,
1568                         elems.country_elem, elems.country_elem_len);
1569
1570                 /* TODO: IBSS also needs this */
1571                 if (elems.pwr_constr_elem)
1572                         ieee80211_handle_pwr_constr(sdata,
1573                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1574                                 elems.pwr_constr_elem,
1575                                 elems.pwr_constr_elem_len);
1576         }
1577
1578         ieee80211_bss_info_change_notify(sdata, changed);
1579 }
1580
1581 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1582                                           struct sk_buff *skb,
1583                                           struct ieee80211_rx_status *rx_status)
1584 {
1585         struct ieee80211_local *local = sdata->local;
1586         struct ieee80211_mgmt *mgmt;
1587         u16 fc;
1588
1589         if (skb->len < 24)
1590                 return RX_DROP_MONITOR;
1591
1592         mgmt = (struct ieee80211_mgmt *) skb->data;
1593         fc = le16_to_cpu(mgmt->frame_control);
1594
1595         switch (fc & IEEE80211_FCTL_STYPE) {
1596         case IEEE80211_STYPE_PROBE_REQ:
1597         case IEEE80211_STYPE_PROBE_RESP:
1598         case IEEE80211_STYPE_BEACON:
1599                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1600         case IEEE80211_STYPE_AUTH:
1601         case IEEE80211_STYPE_ASSOC_RESP:
1602         case IEEE80211_STYPE_REASSOC_RESP:
1603         case IEEE80211_STYPE_DEAUTH:
1604         case IEEE80211_STYPE_DISASSOC:
1605                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1606                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1607                 return RX_QUEUED;
1608         }
1609
1610         return RX_DROP_MONITOR;
1611 }
1612
1613 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1614                                          struct sk_buff *skb)
1615 {
1616         struct ieee80211_rx_status *rx_status;
1617         struct ieee80211_mgmt *mgmt;
1618         u16 fc;
1619
1620         rx_status = (struct ieee80211_rx_status *) skb->cb;
1621         mgmt = (struct ieee80211_mgmt *) skb->data;
1622         fc = le16_to_cpu(mgmt->frame_control);
1623
1624         switch (fc & IEEE80211_FCTL_STYPE) {
1625         case IEEE80211_STYPE_PROBE_RESP:
1626                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
1627                                              rx_status);
1628                 break;
1629         case IEEE80211_STYPE_BEACON:
1630                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1631                                          rx_status);
1632                 break;
1633         case IEEE80211_STYPE_AUTH:
1634                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
1635                 break;
1636         case IEEE80211_STYPE_ASSOC_RESP:
1637                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
1638                 break;
1639         case IEEE80211_STYPE_REASSOC_RESP:
1640                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
1641                 break;
1642         case IEEE80211_STYPE_DEAUTH:
1643                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1644                 break;
1645         case IEEE80211_STYPE_DISASSOC:
1646                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1647                 break;
1648         }
1649
1650         kfree_skb(skb);
1651 }
1652
1653 static void ieee80211_sta_timer(unsigned long data)
1654 {
1655         struct ieee80211_sub_if_data *sdata =
1656                 (struct ieee80211_sub_if_data *) data;
1657         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1658         struct ieee80211_local *local = sdata->local;
1659
1660         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1661         queue_work(local->hw.workqueue, &ifmgd->work);
1662 }
1663
1664 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
1665 {
1666         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1667         struct ieee80211_local *local = sdata->local;
1668
1669         if (local->ops->reset_tsf) {
1670                 /* Reset own TSF to allow time synchronization work. */
1671                 local->ops->reset_tsf(local_to_hw(local));
1672         }
1673
1674         ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
1675
1676
1677         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1678                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1679         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1680                 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
1681         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1682                 ifmgd->auth_alg = WLAN_AUTH_LEAP;
1683         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT)
1684                 ifmgd->auth_alg = WLAN_AUTH_FT;
1685         else
1686                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1687         ifmgd->auth_transaction = -1;
1688         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1689         ifmgd->assoc_scan_tries = 0;
1690         ifmgd->direct_probe_tries = 0;
1691         ifmgd->auth_tries = 0;
1692         ifmgd->assoc_tries = 0;
1693         netif_tx_stop_all_queues(sdata->dev);
1694         netif_carrier_off(sdata->dev);
1695 }
1696
1697 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
1698 {
1699         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1700         struct ieee80211_local *local = sdata->local;
1701         struct ieee80211_bss *bss;
1702         u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
1703         u8 ssid_len = ifmgd->ssid_len;
1704         u16 capa_mask = WLAN_CAPABILITY_ESS;
1705         u16 capa_val = WLAN_CAPABILITY_ESS;
1706         struct ieee80211_channel *chan = local->oper_channel;
1707
1708         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1709             ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
1710                             IEEE80211_STA_AUTO_BSSID_SEL |
1711                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
1712                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
1713                 if (sdata->default_key)
1714                         capa_val |= WLAN_CAPABILITY_PRIVACY;
1715         }
1716
1717         if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
1718                 chan = NULL;
1719
1720         if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1721                 bssid = NULL;
1722
1723         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
1724                 ssid = NULL;
1725                 ssid_len = 0;
1726         }
1727
1728         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
1729                                        bssid, ssid, ssid_len,
1730                                        capa_mask, capa_val);
1731
1732         if (bss) {
1733                 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
1734                 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
1735                         ieee80211_sta_set_ssid(sdata, bss->ssid,
1736                                                bss->ssid_len);
1737                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
1738                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
1739                                                     bss->supp_rates);
1740                 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
1741                         sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
1742                 else
1743                         sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
1744
1745                 /* Send out direct probe if no probe resp was received or
1746                  * the one we have is outdated
1747                  */
1748                 if (!bss->last_probe_resp ||
1749                     time_after(jiffies, bss->last_probe_resp
1750                                         + IEEE80211_SCAN_RESULT_EXPIRE))
1751                         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1752                 else
1753                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1754
1755                 ieee80211_rx_bss_put(local, bss);
1756                 ieee80211_sta_reset_auth(sdata);
1757                 return 0;
1758         } else {
1759                 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
1760                         ifmgd->assoc_scan_tries++;
1761                         /* XXX maybe racy? */
1762                         if (local->scan_req)
1763                                 return -1;
1764                         memcpy(local->int_scan_req.ssids[0].ssid,
1765                                ifmgd->ssid, IEEE80211_MAX_SSID_LEN);
1766                         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL)
1767                                 local->int_scan_req.ssids[0].ssid_len = 0;
1768                         else
1769                                 local->int_scan_req.ssids[0].ssid_len = ifmgd->ssid_len;
1770
1771                         if (ieee80211_start_scan(sdata, &local->int_scan_req))
1772                                 ieee80211_scan_failed(local);
1773
1774                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1775                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
1776                 } else {
1777                         ifmgd->assoc_scan_tries = 0;
1778                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1779                 }
1780         }
1781         return -1;
1782 }
1783
1784
1785 static void ieee80211_sta_work(struct work_struct *work)
1786 {
1787         struct ieee80211_sub_if_data *sdata =
1788                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1789         struct ieee80211_local *local = sdata->local;
1790         struct ieee80211_if_managed *ifmgd;
1791         struct sk_buff *skb;
1792
1793         if (!netif_running(sdata->dev))
1794                 return;
1795
1796         if (local->sw_scanning || local->hw_scanning)
1797                 return;
1798
1799         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1800                 return;
1801         ifmgd = &sdata->u.mgd;
1802
1803         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1804                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1805
1806         if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
1807             ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1808             ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
1809             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
1810                 /*
1811                  * The call to ieee80211_start_scan can fail but ieee80211_request_scan
1812                  * (which queued ieee80211_sta_work) did not return an error. Thus, call
1813                  * ieee80211_scan_failed here if ieee80211_start_scan fails in order to
1814                  * notify the scan requester.
1815                  */
1816                 if (ieee80211_start_scan(sdata, local->scan_req))
1817                         ieee80211_scan_failed(local);
1818                 return;
1819         }
1820
1821         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
1822                 if (ieee80211_sta_config_auth(sdata))
1823                         return;
1824                 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1825         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
1826                 return;
1827
1828         switch (ifmgd->state) {
1829         case IEEE80211_STA_MLME_DISABLED:
1830                 break;
1831         case IEEE80211_STA_MLME_DIRECT_PROBE:
1832                 ieee80211_direct_probe(sdata);
1833                 break;
1834         case IEEE80211_STA_MLME_AUTHENTICATE:
1835                 ieee80211_authenticate(sdata);
1836                 break;
1837         case IEEE80211_STA_MLME_ASSOCIATE:
1838                 ieee80211_associate(sdata);
1839                 break;
1840         case IEEE80211_STA_MLME_ASSOCIATED:
1841                 ieee80211_associated(sdata);
1842                 break;
1843         default:
1844                 WARN_ON(1);
1845                 break;
1846         }
1847
1848         if (ieee80211_privacy_mismatch(sdata)) {
1849                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
1850                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
1851
1852                 ieee80211_set_disassoc(sdata, false, true,
1853                                         WLAN_REASON_UNSPECIFIED);
1854         }
1855 }
1856
1857 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1858 {
1859         if (sdata->vif.type == NL80211_IFTYPE_STATION)
1860                 queue_work(sdata->local->hw.workqueue,
1861                            &sdata->u.mgd.work);
1862 }
1863
1864 /* interface setup */
1865 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1866 {
1867         struct ieee80211_if_managed *ifmgd;
1868
1869         ifmgd = &sdata->u.mgd;
1870         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1871         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1872         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1873                     (unsigned long) sdata);
1874         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1875                     (unsigned long) sdata);
1876         skb_queue_head_init(&ifmgd->skb_queue);
1877
1878         ifmgd->capab = WLAN_CAPABILITY_ESS;
1879         ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
1880                 IEEE80211_AUTH_ALG_SHARED_KEY;
1881         ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
1882                 IEEE80211_STA_AUTO_BSSID_SEL |
1883                 IEEE80211_STA_AUTO_CHANNEL_SEL;
1884         if (sdata->local->hw.queues >= 4)
1885                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
1886 }
1887
1888 /* configuration hooks */
1889 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
1890 {
1891         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1892         struct ieee80211_local *local = sdata->local;
1893
1894         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1895                 return;
1896
1897         if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
1898                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
1899             (ifmgd->flags & (IEEE80211_STA_SSID_SET |
1900                              IEEE80211_STA_AUTO_SSID_SEL))) {
1901
1902                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
1903                         ieee80211_set_disassoc(sdata, true, true,
1904                                                WLAN_REASON_DEAUTH_LEAVING);
1905
1906                 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) ||
1907                     ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1908                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
1909                 else if (ifmgd->flags & IEEE80211_STA_EXT_SME)
1910                         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1911                 queue_work(local->hw.workqueue, &ifmgd->work);
1912         }
1913 }
1914
1915 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
1916 {
1917         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1918
1919         if (ifmgd->ssid_len)
1920                 ifmgd->flags |= IEEE80211_STA_SSID_SET;
1921         else
1922                 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
1923
1924         return 0;
1925 }
1926
1927 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
1928 {
1929         struct ieee80211_if_managed *ifmgd;
1930
1931         if (len > IEEE80211_MAX_SSID_LEN)
1932                 return -EINVAL;
1933
1934         ifmgd = &sdata->u.mgd;
1935
1936         if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
1937                 /*
1938                  * Do not use reassociation if SSID is changed (different ESS).
1939                  */
1940                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1941                 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
1942                 memcpy(ifmgd->ssid, ssid, len);
1943                 ifmgd->ssid_len = len;
1944         }
1945
1946         return ieee80211_sta_commit(sdata);
1947 }
1948
1949 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
1950 {
1951         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1952         memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
1953         *len = ifmgd->ssid_len;
1954         return 0;
1955 }
1956
1957 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
1958 {
1959         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1960
1961         if (is_valid_ether_addr(bssid)) {
1962                 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
1963                 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
1964         } else {
1965                 memset(ifmgd->bssid, 0, ETH_ALEN);
1966                 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
1967         }
1968
1969         if (netif_running(sdata->dev)) {
1970                 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
1971                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
1972                                "the low-level driver\n", sdata->dev->name);
1973                 }
1974         }
1975
1976         return ieee80211_sta_commit(sdata);
1977 }
1978
1979 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
1980                                const char *ie, size_t len)
1981 {
1982         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1983
1984         kfree(ifmgd->extra_ie);
1985         if (len == 0) {
1986                 ifmgd->extra_ie = NULL;
1987                 ifmgd->extra_ie_len = 0;
1988                 return 0;
1989         }
1990         ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
1991         if (!ifmgd->extra_ie) {
1992                 ifmgd->extra_ie_len = 0;
1993                 return -ENOMEM;
1994         }
1995         memcpy(ifmgd->extra_ie, ie, len);
1996         ifmgd->extra_ie_len = len;
1997         return 0;
1998 }
1999
2000 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2001 {
2002         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2003                sdata->dev->name, reason);
2004
2005         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2006                 return -EINVAL;
2007
2008         ieee80211_set_disassoc(sdata, true, true, reason);
2009         return 0;
2010 }
2011
2012 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2013 {
2014         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2015
2016         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2017                sdata->dev->name, reason);
2018
2019         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2020                 return -EINVAL;
2021
2022         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
2023                 return -ENOLINK;
2024
2025         ieee80211_set_disassoc(sdata, false, true, reason);
2026         return 0;
2027 }
2028
2029 /* scan finished notification */
2030 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2031 {
2032         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2033
2034         /* Restart STA timers */
2035         rcu_read_lock();
2036         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2037                 ieee80211_restart_sta_timer(sdata);
2038         rcu_read_unlock();
2039 }
2040
2041 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2042 {
2043         struct ieee80211_local *local =
2044                 container_of(work, struct ieee80211_local,
2045                              dynamic_ps_disable_work);
2046
2047         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2048                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2049                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2050         }
2051
2052         ieee80211_wake_queues_by_reason(&local->hw,
2053                                         IEEE80211_QUEUE_STOP_REASON_PS);
2054 }
2055
2056 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2057 {
2058         struct ieee80211_local *local =
2059                 container_of(work, struct ieee80211_local,
2060                              dynamic_ps_enable_work);
2061         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2062
2063         if (local->hw.conf.flags & IEEE80211_CONF_PS)
2064                 return;
2065
2066         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2067                 ieee80211_send_nullfunc(local, sdata, 1);
2068
2069         local->hw.conf.flags |= IEEE80211_CONF_PS;
2070         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2071 }
2072
2073 void ieee80211_dynamic_ps_timer(unsigned long data)
2074 {
2075         struct ieee80211_local *local = (void *) data;
2076
2077         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2078 }
2079
2080 void ieee80211_send_nullfunc(struct ieee80211_local *local,
2081                              struct ieee80211_sub_if_data *sdata,
2082                              int powersave)
2083 {
2084         struct sk_buff *skb;
2085         struct ieee80211_hdr *nullfunc;
2086         __le16 fc;
2087
2088         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2089                 return;
2090
2091         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
2092         if (!skb) {
2093                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2094                        "frame\n", sdata->dev->name);
2095                 return;
2096         }
2097         skb_reserve(skb, local->hw.extra_tx_headroom);
2098
2099         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
2100         memset(nullfunc, 0, 24);
2101         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
2102                          IEEE80211_FCTL_TODS);
2103         if (powersave)
2104                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
2105         nullfunc->frame_control = fc;
2106         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2107         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
2108         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2109
2110         ieee80211_tx_skb(sdata, skb, 0);
2111 }