mac80211: 802.11w - Implement Association Comeback processing

[mirror_ubuntu-zesty-kernel.git] / net / mac80211 / mlme.c

/*
 * BSS client mode implementation
 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
 * Copyright 2004, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/wireless.h>
#include <linux/random.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <net/iw_handler.h>
#include <net/mac80211.h>
#include <asm/unaligned.h>

#include "ieee80211_i.h"
#include "rate.h"
#include "led.h"

#define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
#define IEEE80211_AUTH_TIMEOUT (HZ / 5)
#define IEEE80211_AUTH_MAX_TRIES 3
#define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
#define IEEE80211_ASSOC_MAX_TRIES 3
#define IEEE80211_MONITORING_INTERVAL (2 * HZ)
#define IEEE80211_PROBE_INTERVAL (60 * HZ)
#define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
#define IEEE80211_SCAN_INTERVAL (2 * HZ)
#define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)

#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)

#define IEEE80211_IBSS_MAX_STA_ENTRIES 128


/* utils */
static int ecw2cw(int ecw)
{
        return (1 << ecw) - 1;
}

static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
{
        u8 *end, *pos;

        pos = bss->ies;
        if (pos == NULL)
                return NULL;
        end = pos + bss->ies_len;

        while (pos + 1 < end) {
                if (pos + 2 + pos[1] > end)
                        break;
                if (pos[0] == ie)
                        return pos;
                pos += 2 + pos[1];
        }

        return NULL;
}

static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
                                      struct ieee80211_supported_band *sband,
                                      u64 *rates)
{
        int i, j, count;
        *rates = 0;
        count = 0;
        for (i = 0; i < bss->supp_rates_len; i++) {
                int rate = (bss->supp_rates[i] & 0x7F) * 5;

                for (j = 0; j < sband->n_bitrates; j++)
                        if (sband->bitrates[j].bitrate == rate) {
                                *rates |= BIT(j);
                                count++;
                                break;
                        }
        }

        return count;
}

/* also used by mesh code */
u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
                            struct ieee802_11_elems *elems,
                            enum ieee80211_band band)
{
        struct ieee80211_supported_band *sband;
        struct ieee80211_rate *bitrates;
        size_t num_rates;
        u64 supp_rates;
        int i, j;
        sband = local->hw.wiphy->bands[band];

        if (!sband) {
                WARN_ON(1);
                sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
        }

        bitrates = sband->bitrates;
        num_rates = sband->n_bitrates;
        supp_rates = 0;
        for (i = 0; i < elems->supp_rates_len +
                     elems->ext_supp_rates_len; i++) {
                u8 rate = 0;
                int own_rate;
                if (i < elems->supp_rates_len)
                        rate = elems->supp_rates[i];
                else if (elems->ext_supp_rates)
                        rate = elems->ext_supp_rates
                                [i - elems->supp_rates_len];
                own_rate = 5 * (rate & 0x7f);
                for (j = 0; j < num_rates; j++)
                        if (bitrates[j].bitrate == own_rate)
                                supp_rates |= BIT(j);
        }
        return supp_rates;
}

/* frame sending functions */

/* also used by scanning code */
void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
                              u8 *ssid, size_t ssid_len)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_supported_band *sband;
        struct sk_buff *skb;
        struct ieee80211_mgmt *mgmt;
        u8 *pos, *supp_rates, *esupp_rates = NULL;
        int i;

        skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
        if (!skb) {
                printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
                       "request\n", sdata->dev->name);
                return;
        }
        skb_reserve(skb, local->hw.extra_tx_headroom);

        mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
        memset(mgmt, 0, 24);
        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                          IEEE80211_STYPE_PROBE_REQ);
        memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
        if (dst) {
                memcpy(mgmt->da, dst, ETH_ALEN);
                memcpy(mgmt->bssid, dst, ETH_ALEN);
        } else {
                memset(mgmt->da, 0xff, ETH_ALEN);
                memset(mgmt->bssid, 0xff, ETH_ALEN);
        }
        pos = skb_put(skb, 2 + ssid_len);
        *pos++ = WLAN_EID_SSID;
        *pos++ = ssid_len;
        memcpy(pos, ssid, ssid_len);

        supp_rates = skb_put(skb, 2);
        supp_rates[0] = WLAN_EID_SUPP_RATES;
        supp_rates[1] = 0;
        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

        for (i = 0; i < sband->n_bitrates; i++) {
                struct ieee80211_rate *rate = &sband->bitrates[i];
                if (esupp_rates) {
                        pos = skb_put(skb, 1);
                        esupp_rates[1]++;
                } else if (supp_rates[1] == 8) {
                        esupp_rates = skb_put(skb, 3);
                        esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
                        esupp_rates[1] = 1;
                        pos = &esupp_rates[2];
                } else {
                        pos = skb_put(skb, 1);
                        supp_rates[1]++;
                }
                *pos = rate->bitrate / 5;
        }

        ieee80211_tx_skb(sdata, skb, 0);
}

static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
                                struct ieee80211_if_sta *ifsta,
                                int transaction, u8 *extra, size_t extra_len,
                                int encrypt)
{
        struct ieee80211_local *local = sdata->local;
        struct sk_buff *skb;
        struct ieee80211_mgmt *mgmt;

        skb = dev_alloc_skb(local->hw.extra_tx_headroom +
                            sizeof(*mgmt) + 6 + extra_len);
        if (!skb) {
                printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
                       "frame\n", sdata->dev->name);
                return;
        }
        skb_reserve(skb, local->hw.extra_tx_headroom);

        mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
        memset(mgmt, 0, 24 + 6);
        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                          IEEE80211_STYPE_AUTH);
        if (encrypt)
                mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
        memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
        memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
        memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
        mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
        mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
        ifsta->auth_transaction = transaction + 1;
        mgmt->u.auth.status_code = cpu_to_le16(0);
        if (extra)
                memcpy(skb_put(skb, extra_len), extra, extra_len);

        ieee80211_tx_skb(sdata, skb, encrypt);
}

static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
                                 struct ieee80211_if_sta *ifsta)
{
        struct ieee80211_local *local = sdata->local;
        struct sk_buff *skb;
        struct ieee80211_mgmt *mgmt;
        u8 *pos, *ies, *ht_ie;
        int i, len, count, rates_len, supp_rates_len;
        u16 capab;
        struct ieee80211_bss *bss;
        int wmm = 0;
        struct ieee80211_supported_band *sband;
        u64 rates = 0;

        skb = dev_alloc_skb(local->hw.extra_tx_headroom +
                            sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
                            ifsta->ssid_len);
        if (!skb) {
                printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
                       "frame\n", sdata->dev->name);
                return;
        }
        skb_reserve(skb, local->hw.extra_tx_headroom);

        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

        capab = ifsta->capab;

        if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
                if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
                        capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
                if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
                        capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
        }

        bss = ieee80211_rx_bss_get(local, ifsta->bssid,
                                   local->hw.conf.channel->center_freq,
                                   ifsta->ssid, ifsta->ssid_len);
        if (bss) {
                if (bss->capability & WLAN_CAPABILITY_PRIVACY)
                        capab |= WLAN_CAPABILITY_PRIVACY;
                if (bss->wmm_used)
                        wmm = 1;

                /* get all rates supported by the device and the AP as
                 * some APs don't like getting a superset of their rates
                 * in the association request (e.g. D-Link DAP 1353 in
                 * b-only mode) */
                rates_len = ieee80211_compatible_rates(bss, sband, &rates);

                if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
                    (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
                        capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;

                ieee80211_rx_bss_put(local, bss);
        } else {
                rates = ~0;
                rates_len = sband->n_bitrates;
        }

        mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
        memset(mgmt, 0, 24);
        memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
        memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
        memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);

        if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
                skb_put(skb, 10);
                mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                                  IEEE80211_STYPE_REASSOC_REQ);
                mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
                mgmt->u.reassoc_req.listen_interval =
                                cpu_to_le16(local->hw.conf.listen_interval);
                memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
                       ETH_ALEN);
        } else {
                skb_put(skb, 4);
                mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                                  IEEE80211_STYPE_ASSOC_REQ);
                mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
                mgmt->u.assoc_req.listen_interval =
                                cpu_to_le16(local->hw.conf.listen_interval);
        }

        /* SSID */
        ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
        *pos++ = WLAN_EID_SSID;
        *pos++ = ifsta->ssid_len;
        memcpy(pos, ifsta->ssid, ifsta->ssid_len);

        /* add all rates which were marked to be used above */
        supp_rates_len = rates_len;
        if (supp_rates_len > 8)
                supp_rates_len = 8;

        len = sband->n_bitrates;
        pos = skb_put(skb, supp_rates_len + 2);
        *pos++ = WLAN_EID_SUPP_RATES;
        *pos++ = supp_rates_len;

        count = 0;
        for (i = 0; i < sband->n_bitrates; i++) {
                if (BIT(i) & rates) {
                        int rate = sband->bitrates[i].bitrate;
                        *pos++ = (u8) (rate / 5);
                        if (++count == 8)
                                break;
                }
        }

        if (rates_len > count) {
                pos = skb_put(skb, rates_len - count + 2);
                *pos++ = WLAN_EID_EXT_SUPP_RATES;
                *pos++ = rates_len - count;

                for (i++; i < sband->n_bitrates; i++) {
                        if (BIT(i) & rates) {
                                int rate = sband->bitrates[i].bitrate;
                                *pos++ = (u8) (rate / 5);
                        }
                }
        }

        if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
                /* 1. power capabilities */
                pos = skb_put(skb, 4);
                *pos++ = WLAN_EID_PWR_CAPABILITY;
                *pos++ = 2;
                *pos++ = 0; /* min tx power */
                *pos++ = local->hw.conf.channel->max_power; /* max tx power */

                /* 2. supported channels */
                /* TODO: get this in reg domain format */
                pos = skb_put(skb, 2 * sband->n_channels + 2);
                *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
                *pos++ = 2 * sband->n_channels;
                for (i = 0; i < sband->n_channels; i++) {
                        *pos++ = ieee80211_frequency_to_channel(
                                        sband->channels[i].center_freq);
                        *pos++ = 1; /* one channel in the subband*/
                }
        }

        if (ifsta->extra_ie) {
                pos = skb_put(skb, ifsta->extra_ie_len);
                memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
        }

        if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
                pos = skb_put(skb, 9);
                *pos++ = WLAN_EID_VENDOR_SPECIFIC;
                *pos++ = 7; /* len */
                *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
                *pos++ = 0x50;
                *pos++ = 0xf2;
                *pos++ = 2; /* WME */
                *pos++ = 0; /* WME info */
                *pos++ = 1; /* WME ver */
                *pos++ = 0;
        }

        /* wmm support is a must to HT */
        /*
         * IEEE802.11n does not allow TKIP/WEP as pairwise
         * ciphers in HT mode. We still associate in non-ht
         * mode (11a/b/g) if any one of these ciphers is
         * configured as pairwise.
         */
        if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
            sband->ht_cap.ht_supported &&
            (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
            ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
            (!(ifsta->flags & IEEE80211_STA_TKIP_WEP_USED))) {
                struct ieee80211_ht_info *ht_info =
                        (struct ieee80211_ht_info *)(ht_ie + 2);
                u16 cap = sband->ht_cap.cap;
                __le16 tmp;
                u32 flags = local->hw.conf.channel->flags;

                switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
                case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
                        if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
                                cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
                                cap &= ~IEEE80211_HT_CAP_SGI_40;
                        }
                        break;
                case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
                        if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
                                cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
                                cap &= ~IEEE80211_HT_CAP_SGI_40;
                        }
                        break;
                }

                tmp = cpu_to_le16(cap);
                pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
                *pos++ = WLAN_EID_HT_CAPABILITY;
                *pos++ = sizeof(struct ieee80211_ht_cap);
                memset(pos, 0, sizeof(struct ieee80211_ht_cap));
                memcpy(pos, &tmp, sizeof(u16));
                pos += sizeof(u16);
                /* TODO: needs a define here for << 2 */
                *pos++ = sband->ht_cap.ampdu_factor |
                         (sband->ht_cap.ampdu_density << 2);
                memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
        }

        kfree(ifsta->assocreq_ies);
        ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
        ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
        if (ifsta->assocreq_ies)
                memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);

        ieee80211_tx_skb(sdata, skb, 0);
}


static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
                                           u16 stype, u16 reason)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_sta *ifsta = &sdata->u.sta;
        struct sk_buff *skb;
        struct ieee80211_mgmt *mgmt;

        skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
        if (!skb) {
                printk(KERN_DEBUG "%s: failed to allocate buffer for "
                       "deauth/disassoc frame\n", sdata->dev->name);
                return;
        }
        skb_reserve(skb, local->hw.extra_tx_headroom);

        mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
        memset(mgmt, 0, 24);
        memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
        memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
        memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
        skb_put(skb, 2);
        /* u.deauth.reason_code == u.disassoc.reason_code */
        mgmt->u.deauth.reason_code = cpu_to_le16(reason);

        ieee80211_tx_skb(sdata, skb, ifsta->flags & IEEE80211_STA_MFP_ENABLED);
}

/* MLME */
static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
                                         struct ieee80211_bss *bss)
{
        struct ieee80211_local *local = sdata->local;
        int i, have_higher_than_11mbit = 0;

        /* cf. IEEE 802.11 9.2.12 */
        for (i = 0; i < bss->supp_rates_len; i++)
                if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
                        have_higher_than_11mbit = 1;

        if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
            have_higher_than_11mbit)
                sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
        else
                sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

        ieee80211_set_wmm_default(sdata);
}

static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
                                     struct ieee80211_if_sta *ifsta,
                                     u8 *wmm_param, size_t wmm_param_len)
{
        struct ieee80211_tx_queue_params params;
        size_t left;
        int count;
        u8 *pos;

        if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
                return;

        if (!wmm_param)
                return;

        if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
                return;
        count = wmm_param[6] & 0x0f;
        if (count == ifsta->wmm_last_param_set)
                return;
        ifsta->wmm_last_param_set = count;

        pos = wmm_param + 8;
        left = wmm_param_len - 8;

        memset(&params, 0, sizeof(params));

        if (!local->ops->conf_tx)
                return;

        local->wmm_acm = 0;
        for (; left >= 4; left -= 4, pos += 4) {
                int aci = (pos[0] >> 5) & 0x03;
                int acm = (pos[0] >> 4) & 0x01;
                int queue;

                switch (aci) {
                case 1:
                        queue = 3;
                        if (acm)
                                local->wmm_acm |= BIT(0) | BIT(3);
                        break;
                case 2:
                        queue = 1;
                        if (acm)
                                local->wmm_acm |= BIT(4) | BIT(5);
                        break;
                case 3:
                        queue = 0;
                        if (acm)
                                local->wmm_acm |= BIT(6) | BIT(7);
                        break;
                case 0:
                default:
                        queue = 2;
                        if (acm)
                                local->wmm_acm |= BIT(1) | BIT(2);
                        break;
                }

                params.aifs = pos[0] & 0x0f;
                params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
                params.cw_min = ecw2cw(pos[1] & 0x0f);
                params.txop = get_unaligned_le16(pos + 2);
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
                printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
                       "cWmin=%d cWmax=%d txop=%d\n",
                       local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
                       params.cw_max, params.txop);
#endif
                /* TODO: handle ACM (block TX, fallback to next lowest allowed
                 * AC for now) */
                if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
                        printk(KERN_DEBUG "%s: failed to set TX queue "
                               "parameters for queue %d\n", local->mdev->name, queue);
                }
        }
}

static bool check_tim(struct ieee802_11_elems *elems, u16 aid, bool *is_mc)
{
        u8 mask;
        u8 index, indexn1, indexn2;
        struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;

        aid &= 0x3fff;
        index = aid / 8;
        mask  = 1 << (aid & 7);

        if (tim->bitmap_ctrl & 0x01)
                *is_mc = true;

        indexn1 = tim->bitmap_ctrl & 0xfe;
        indexn2 = elems->tim_len + indexn1 - 4;

        if (index < indexn1 || index > indexn2)
                return false;

        index -= indexn1;

        return !!(tim->virtual_map[index] & mask);
}

static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
                                           u16 capab, bool erp_valid, u8 erp)
{
        struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
        struct ieee80211_if_sta *ifsta = &sdata->u.sta;
#endif
        u32 changed = 0;
        bool use_protection;
        bool use_short_preamble;
        bool use_short_slot;

        if (erp_valid) {
                use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
                use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
        } else {
                use_protection = false;
                use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
        }

        use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);

        if (use_protection != bss_conf->use_cts_prot) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
                if (net_ratelimit()) {
                        printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
                               sdata->dev->name,
                               use_protection ? "enabled" : "disabled",
                               ifsta->bssid);
                }
#endif
                bss_conf->use_cts_prot = use_protection;
                changed |= BSS_CHANGED_ERP_CTS_PROT;
        }

        if (use_short_preamble != bss_conf->use_short_preamble) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
                if (net_ratelimit()) {
                        printk(KERN_DEBUG "%s: switched to %s barker preamble"
                               " (BSSID=%pM)\n",
                               sdata->dev->name,
                               use_short_preamble ? "short" : "long",
                               ifsta->bssid);
                }
#endif
                bss_conf->use_short_preamble = use_short_preamble;
                changed |= BSS_CHANGED_ERP_PREAMBLE;
        }

        if (use_short_slot != bss_conf->use_short_slot) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
                if (net_ratelimit()) {
                        printk(KERN_DEBUG "%s: switched to %s slot time"
                               " (BSSID=%pM)\n",
                               sdata->dev->name,
                               use_short_slot ? "short" : "long",
                               ifsta->bssid);
                }
#endif
                bss_conf->use_short_slot = use_short_slot;
                changed |= BSS_CHANGED_ERP_SLOT;
        }

        return changed;
}

static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
                                        struct ieee80211_if_sta *ifsta)
{
        union iwreq_data wrqu;
        memset(&wrqu, 0, sizeof(wrqu));
        if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
                memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
        wrqu.ap_addr.sa_family = ARPHRD_ETHER;
        wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
}

static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
                                         struct ieee80211_if_sta *ifsta)
{
        char *buf;
        size_t len;
        int i;
        union iwreq_data wrqu;

        if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
                return;

        buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
                                ifsta->assocresp_ies_len), GFP_KERNEL);
        if (!buf)
                return;

        len = sprintf(buf, "ASSOCINFO(");
        if (ifsta->assocreq_ies) {
                len += sprintf(buf + len, "ReqIEs=");
                for (i = 0; i < ifsta->assocreq_ies_len; i++) {
                        len += sprintf(buf + len, "%02x",
                                       ifsta->assocreq_ies[i]);
                }
        }
        if (ifsta->assocresp_ies) {
                if (ifsta->assocreq_ies)
                        len += sprintf(buf + len, " ");
                len += sprintf(buf + len, "RespIEs=");
                for (i = 0; i < ifsta->assocresp_ies_len; i++) {
                        len += sprintf(buf + len, "%02x",
                                       ifsta->assocresp_ies[i]);
                }
        }
        len += sprintf(buf + len, ")");

        if (len > IW_CUSTOM_MAX) {
                len = sprintf(buf, "ASSOCRESPIE=");
                for (i = 0; i < ifsta->assocresp_ies_len; i++) {
                        len += sprintf(buf + len, "%02x",
                                       ifsta->assocresp_ies[i]);
                }
        }

        if (len <= IW_CUSTOM_MAX) {
                memset(&wrqu, 0, sizeof(wrqu));
                wrqu.data.length = len;
                wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
        }

        kfree(buf);
}


static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_if_sta *ifsta,
                                     u32 bss_info_changed)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_conf *conf = &local_to_hw(local)->conf;

        struct ieee80211_bss *bss;

        bss_info_changed |= BSS_CHANGED_ASSOC;
        ifsta->flags |= IEEE80211_STA_ASSOCIATED;

        if (sdata->vif.type != NL80211_IFTYPE_STATION)
                return;

        bss = ieee80211_rx_bss_get(local, ifsta->bssid,
                                   conf->channel->center_freq,
                                   ifsta->ssid, ifsta->ssid_len);
        if (bss) {
                /* set timing information */
                sdata->vif.bss_conf.beacon_int = bss->beacon_int;
                sdata->vif.bss_conf.timestamp = bss->timestamp;
                sdata->vif.bss_conf.dtim_period = bss->dtim_period;

                bss_info_changed |= ieee80211_handle_bss_capability(sdata,
                        bss->capability, bss->has_erp_value, bss->erp_value);

                ieee80211_rx_bss_put(local, bss);
        }

        ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
        memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
        ieee80211_sta_send_associnfo(sdata, ifsta);

        ifsta->last_probe = jiffies;
        ieee80211_led_assoc(local, 1);

        sdata->vif.bss_conf.assoc = 1;
        /*
         * For now just always ask the driver to update the basic rateset
         * when we have associated, we aren't checking whether it actually
         * changed or not.
         */
        bss_info_changed |= BSS_CHANGED_BASIC_RATES;
        ieee80211_bss_info_change_notify(sdata, bss_info_changed);

        if (local->powersave) {
                if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
                    local->hw.conf.dynamic_ps_timeout > 0) {
                        mod_timer(&local->dynamic_ps_timer, jiffies +
                                  msecs_to_jiffies(
                                        local->hw.conf.dynamic_ps_timeout));
                } else {
                        if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
                                ieee80211_send_nullfunc(local, sdata, 1);
                        conf->flags |= IEEE80211_CONF_PS;
                        ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
                }
        }

        netif_tx_start_all_queues(sdata->dev);
        netif_carrier_on(sdata->dev);

        ieee80211_sta_send_apinfo(sdata, ifsta);
}

static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
                                   struct ieee80211_if_sta *ifsta)
{
        ifsta->direct_probe_tries++;
        if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
                printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
                       sdata->dev->name, ifsta->bssid);
                ifsta->state = IEEE80211_STA_MLME_DISABLED;
                ieee80211_sta_send_apinfo(sdata, ifsta);
                return;
        }

        printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
                        sdata->dev->name, ifsta->bssid,
                        ifsta->direct_probe_tries);

        ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;

        set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);

        /* Direct probe is sent to broadcast address as some APs
         * will not answer to direct packet in unassociated state.
         */
        ieee80211_send_probe_req(sdata, NULL,
                                 ifsta->ssid, ifsta->ssid_len);

        mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
}


static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
                                   struct ieee80211_if_sta *ifsta)
{
        ifsta->auth_tries++;
        if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
                printk(KERN_DEBUG "%s: authentication with AP %pM"
                       " timed out\n",
                       sdata->dev->name, ifsta->bssid);
                ifsta->state = IEEE80211_STA_MLME_DISABLED;
                ieee80211_sta_send_apinfo(sdata, ifsta);
                return;
        }

        ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
        printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
               sdata->dev->name, ifsta->bssid);

        ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);

        mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
}

/*
 * The disassoc 'reason' argument can be either our own reason
 * if self disconnected or a reason code from the AP.
 */
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
                                   struct ieee80211_if_sta *ifsta, bool deauth,
                                   bool self_disconnected, u16 reason)
{
        struct ieee80211_local *local = sdata->local;
        struct sta_info *sta;
        u32 changed = 0, config_changed = 0;

        rcu_read_lock();

        sta = sta_info_get(local, ifsta->bssid);
        if (!sta) {
                rcu_read_unlock();
                return;
        }

        if (deauth) {
                ifsta->direct_probe_tries = 0;
                ifsta->auth_tries = 0;
        }
        ifsta->assoc_scan_tries = 0;
        ifsta->assoc_tries = 0;

        netif_tx_stop_all_queues(sdata->dev);
        netif_carrier_off(sdata->dev);

        ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);

        if (self_disconnected) {
                if (deauth)
                        ieee80211_send_deauth_disassoc(sdata,
                                IEEE80211_STYPE_DEAUTH, reason);
                else
                        ieee80211_send_deauth_disassoc(sdata,
                                IEEE80211_STYPE_DISASSOC, reason);
        }

        ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
        changed |= ieee80211_reset_erp_info(sdata);

        ieee80211_led_assoc(local, 0);
        changed |= BSS_CHANGED_ASSOC;
        sdata->vif.bss_conf.assoc = false;

        ieee80211_sta_send_apinfo(sdata, ifsta);

        if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT)
                ifsta->state = IEEE80211_STA_MLME_DISABLED;

        rcu_read_unlock();

        /* channel(_type) changes are handled by ieee80211_hw_config */
        local->oper_channel_type = NL80211_CHAN_NO_HT;

        del_timer_sync(&local->dynamic_ps_timer);
        cancel_work_sync(&local->dynamic_ps_enable_work);

        if (local->hw.conf.flags & IEEE80211_CONF_PS) {
                local->hw.conf.flags &= ~IEEE80211_CONF_PS;
                config_changed |= IEEE80211_CONF_CHANGE_PS;
        }

        ieee80211_hw_config(local, config_changed);
        ieee80211_bss_info_change_notify(sdata, changed);

        rcu_read_lock();

        sta = sta_info_get(local, ifsta->bssid);
        if (!sta) {
                rcu_read_unlock();
                return;
        }

        sta_info_unlink(&sta);

        rcu_read_unlock();

        sta_info_destroy(sta);
}

static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
{
        if (!sdata || !sdata->default_key ||
            sdata->default_key->conf.alg != ALG_WEP)
                return 0;
        return 1;
}

static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
                                      struct ieee80211_if_sta *ifsta)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_bss *bss;
        int bss_privacy;
        int wep_privacy;
        int privacy_invoked;

        if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
                return 0;

        bss = ieee80211_rx_bss_get(local, ifsta->bssid,
                                   local->hw.conf.channel->center_freq,
                                   ifsta->ssid, ifsta->ssid_len);
        if (!bss)
                return 0;

        bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
        wep_privacy = !!ieee80211_sta_wep_configured(sdata);
        privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);

        ieee80211_rx_bss_put(local, bss);

        if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
                return 0;

        return 1;
}

static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
                                struct ieee80211_if_sta *ifsta)
{
        ifsta->assoc_tries++;
        if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
                printk(KERN_DEBUG "%s: association with AP %pM"
                       " timed out\n",
                       sdata->dev->name, ifsta->bssid);
                ifsta->state = IEEE80211_STA_MLME_DISABLED;
                ieee80211_sta_send_apinfo(sdata, ifsta);
                return;
        }

        ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
        printk(KERN_DEBUG "%s: associate with AP %pM\n",
               sdata->dev->name, ifsta->bssid);
        if (ieee80211_privacy_mismatch(sdata, ifsta)) {
                printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
                       "mixed-cell disabled - abort association\n", sdata->dev->name);
                ifsta->state = IEEE80211_STA_MLME_DISABLED;
                return;
        }

        ieee80211_send_assoc(sdata, ifsta);

        mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
}


static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
                                 struct ieee80211_if_sta *ifsta)
{
        struct ieee80211_local *local = sdata->local;
        struct sta_info *sta;
        int disassoc;

        /* TODO: start monitoring current AP signal quality and number of
         * missed beacons. Scan other channels every now and then and search
         * for better APs. */
        /* TODO: remove expired BSSes */

        ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;

        rcu_read_lock();

        sta = sta_info_get(local, ifsta->bssid);
        if (!sta) {
                printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
                       sdata->dev->name, ifsta->bssid);
                disassoc = 1;
        } else {
                disassoc = 0;
                if (time_after(jiffies,
                               sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
                        if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
                                printk(KERN_DEBUG "%s: No ProbeResp from "
                                       "current AP %pM - assume out of "
                                       "range\n",
                                       sdata->dev->name, ifsta->bssid);
                                disassoc = 1;
                        } else
                                ieee80211_send_probe_req(sdata, ifsta->bssid,
                                                         ifsta->ssid,
                                                         ifsta->ssid_len);
                        ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
                } else {
                        ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
                        if (time_after(jiffies, ifsta->last_probe +
                                       IEEE80211_PROBE_INTERVAL)) {
                                ifsta->last_probe = jiffies;
                                ieee80211_send_probe_req(sdata, ifsta->bssid,
                                                         ifsta->ssid,
                                                         ifsta->ssid_len);
                        }
                }
        }

        rcu_read_unlock();

        if (disassoc)
                ieee80211_set_disassoc(sdata, ifsta, true, true,
                                        WLAN_REASON_PREV_AUTH_NOT_VALID);
        else
                mod_timer(&ifsta->timer, jiffies +
                                      IEEE80211_MONITORING_INTERVAL);
}


static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_if_sta *ifsta)
{
        printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
        ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
        ieee80211_associate(sdata, ifsta);
}


static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_if_sta *ifsta,
                                     struct ieee80211_mgmt *mgmt,
                                     size_t len)
{
        u8 *pos;
        struct ieee802_11_elems elems;

        pos = mgmt->u.auth.variable;
        ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
        if (!elems.challenge)
                return;
        ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
                            elems.challenge_len + 2, 1);
}

static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
                                   struct ieee80211_if_sta *ifsta,
                                   struct ieee80211_mgmt *mgmt,
                                   size_t len)
{
        u16 auth_alg, auth_transaction, status_code;

        if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
            sdata->vif.type != NL80211_IFTYPE_ADHOC)
                return;

        if (len < 24 + 6)
                return;

        if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
            memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
                return;

        if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
            memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
                return;

        auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
        auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
        status_code = le16_to_cpu(mgmt->u.auth.status_code);

        if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
                /*
                 * IEEE 802.11 standard does not require authentication in IBSS
                 * networks and most implementations do not seem to use it.
                 * However, try to reply to authentication attempts if someone
                 * has actually implemented this.
                 */
                if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
                        return;
                ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
        }

        if (auth_alg != ifsta->auth_alg ||
            auth_transaction != ifsta->auth_transaction)
                return;

        if (status_code != WLAN_STATUS_SUCCESS) {
                if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
                        u8 algs[3];
                        const int num_algs = ARRAY_SIZE(algs);
                        int i, pos;
                        algs[0] = algs[1] = algs[2] = 0xff;
                        if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
                                algs[0] = WLAN_AUTH_OPEN;
                        if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
                                algs[1] = WLAN_AUTH_SHARED_KEY;
                        if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
                                algs[2] = WLAN_AUTH_LEAP;
                        if (ifsta->auth_alg == WLAN_AUTH_OPEN)
                                pos = 0;
                        else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
                                pos = 1;
                        else
                                pos = 2;
                        for (i = 0; i < num_algs; i++) {
                                pos++;
                                if (pos >= num_algs)
                                        pos = 0;
                                if (algs[pos] == ifsta->auth_alg ||
                                    algs[pos] == 0xff)
                                        continue;
                                if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
                                    !ieee80211_sta_wep_configured(sdata))
                                        continue;
                                ifsta->auth_alg = algs[pos];
                                break;
                        }
                }
                return;
        }

        switch (ifsta->auth_alg) {
        case WLAN_AUTH_OPEN:
        case WLAN_AUTH_LEAP:
                ieee80211_auth_completed(sdata, ifsta);
                break;
        case WLAN_AUTH_SHARED_KEY:
                if (ifsta->auth_transaction == 4)
                        ieee80211_auth_completed(sdata, ifsta);
                else
                        ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
                break;
        }
}


static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_if_sta *ifsta,
                                     struct ieee80211_mgmt *mgmt,
                                     size_t len)
{
        u16 reason_code;

        if (len < 24 + 2)
                return;

        if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
                return;

        reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);

        if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
                printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
                                sdata->dev->name, reason_code);

        if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
            ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
            ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
                ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
                mod_timer(&ifsta->timer, jiffies +
                                      IEEE80211_RETRY_AUTH_INTERVAL);
        }

        ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
        ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
}


static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
                                       struct ieee80211_if_sta *ifsta,
                                       struct ieee80211_mgmt *mgmt,
                                       size_t len)
{
        u16 reason_code;

        if (len < 24 + 2)
                return;

        if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
                return;

        reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);

        if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
                printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
                                sdata->dev->name, reason_code);

        if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
                ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
                mod_timer(&ifsta->timer, jiffies +
                                      IEEE80211_RETRY_AUTH_INTERVAL);
        }

        ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
}


static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
                                         struct ieee80211_if_sta *ifsta,
                                         struct ieee80211_mgmt *mgmt,
                                         size_t len,
                                         int reassoc)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_supported_band *sband;
        struct sta_info *sta;
        u64 rates, basic_rates;
        u16 capab_info, status_code, aid;
        struct ieee802_11_elems elems;
        struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
        u8 *pos;
        u32 changed = 0;
        int i, j;
        bool have_higher_than_11mbit = false, newsta = false;
        u16 ap_ht_cap_flags;

        /* AssocResp and ReassocResp have identical structure, so process both
         * of them in this function. */

        if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
                return;

        if (len < 24 + 6)
                return;

        if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
                return;

        capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
        status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
        aid = le16_to_cpu(mgmt->u.assoc_resp.aid);

        printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
               "status=%d aid=%d)\n",
               sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
               capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));

        pos = mgmt->u.assoc_resp.variable;
        ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);

        if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
            elems.assoc_comeback && elems.assoc_comeback_len == 4) {
                u32 tu, ms;
                tu = get_unaligned_le32(elems.assoc_comeback);
                ms = tu * 1024 / 1000;
                printk(KERN_DEBUG "%s: AP rejected association temporarily; "
                       "comeback duration %u TU (%u ms)\n",
                       sdata->dev->name, tu, ms);
                if (ms > IEEE80211_ASSOC_TIMEOUT)
                        mod_timer(&ifsta->timer,
                                  jiffies + msecs_to_jiffies(ms));
                return;
        }

        if (status_code != WLAN_STATUS_SUCCESS) {
                printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
                       sdata->dev->name, status_code);
                /* if this was a reassociation, ensure we try a "full"
                 * association next time. This works around some broken APs
                 * which do not correctly reject reassociation requests. */
                ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
                return;
        }

        if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
                printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
                       "set\n", sdata->dev->name, aid);
        aid &= ~(BIT(15) | BIT(14));

        if (!elems.supp_rates) {
                printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
                       sdata->dev->name);
                return;
        }

        printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
        ifsta->aid = aid;
        ifsta->ap_capab = capab_info;

        kfree(ifsta->assocresp_ies);
        ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
        ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
        if (ifsta->assocresp_ies)
                memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);

        rcu_read_lock();

        /* Add STA entry for the AP */
        sta = sta_info_get(local, ifsta->bssid);
        if (!sta) {
                struct ieee80211_bss *bss;

                newsta = true;

                sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
                if (!sta) {
                        printk(KERN_DEBUG "%s: failed to alloc STA entry for"
                               " the AP\n", sdata->dev->name);
                        rcu_read_unlock();
                        return;
                }
                bss = ieee80211_rx_bss_get(local, ifsta->bssid,
                                           local->hw.conf.channel->center_freq,
                                           ifsta->ssid, ifsta->ssid_len);
                if (bss) {
                        sta->last_signal = bss->signal;
                        sta->last_qual = bss->qual;
                        sta->last_noise = bss->noise;
                        ieee80211_rx_bss_put(local, bss);
                }

                /* update new sta with its last rx activity */
                sta->last_rx = jiffies;
        }

        /*
         * FIXME: Do we really need to update the sta_info's information here?
         *        We already know about the AP (we found it in our list) so it
         *        should already be filled with the right info, no?
         *        As is stands, all this is racy because typically we assume
         *        the information that is filled in here (except flags) doesn't
         *        change while a STA structure is alive. As such, it should move
         *        to between the sta_info_alloc() and sta_info_insert() above.
         */

        set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
                           WLAN_STA_AUTHORIZED);

        rates = 0;
        basic_rates = 0;
        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

        for (i = 0; i < elems.supp_rates_len; i++) {
                int rate = (elems.supp_rates[i] & 0x7f) * 5;
                bool is_basic = !!(elems.supp_rates[i] & 0x80);

                if (rate > 110)
                        have_higher_than_11mbit = true;

                for (j = 0; j < sband->n_bitrates; j++) {
                        if (sband->bitrates[j].bitrate == rate) {
                                rates |= BIT(j);
                                if (is_basic)
                                        basic_rates |= BIT(j);
                                break;
                        }
                }
        }

        for (i = 0; i < elems.ext_supp_rates_len; i++) {
                int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
                bool is_basic = !!(elems.supp_rates[i] & 0x80);

                if (rate > 110)
                        have_higher_than_11mbit = true;

                for (j = 0; j < sband->n_bitrates; j++) {
                        if (sband->bitrates[j].bitrate == rate) {
                                rates |= BIT(j);
                                if (is_basic)
                                        basic_rates |= BIT(j);
                                break;
                        }
                }
        }

        sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
        sdata->vif.bss_conf.basic_rates = basic_rates;

        /* cf. IEEE 802.11 9.2.12 */
        if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
            have_higher_than_11mbit)
                sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
        else
                sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

        if (elems.ht_cap_elem)
                ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
                                elems.ht_cap_elem, &sta->sta.ht_cap);

        ap_ht_cap_flags = sta->sta.ht_cap.cap;

        rate_control_rate_init(sta);

        if (ifsta->flags & IEEE80211_STA_MFP_ENABLED)
                set_sta_flags(sta, WLAN_STA_MFP);

        if (elems.wmm_param)
                set_sta_flags(sta, WLAN_STA_WME);

        if (newsta) {
                int err = sta_info_insert(sta);
                if (err) {
                        printk(KERN_DEBUG "%s: failed to insert STA entry for"
                               " the AP (error %d)\n", sdata->dev->name, err);
                        rcu_read_unlock();
                        return;
                }
        }

        rcu_read_unlock();

        if (elems.wmm_param)
                ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
                                         elems.wmm_param_len);

        if (elems.ht_info_elem && elems.wmm_param &&
            (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
                changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
                                               ap_ht_cap_flags);

        /* set AID and assoc capability,
         * ieee80211_set_associated() will tell the driver */
        bss_conf->aid = aid;
        bss_conf->assoc_capability = capab_info;
        ieee80211_set_associated(sdata, ifsta, changed);

        ieee80211_associated(sdata, ifsta);
}


static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
                                   struct ieee80211_if_sta *ifsta,
                                   struct ieee80211_bss *bss)
{
        struct ieee80211_local *local = sdata->local;
        int res, rates, i, j;
        struct sk_buff *skb;
        struct ieee80211_mgmt *mgmt;
        u8 *pos;
        struct ieee80211_supported_band *sband;
        union iwreq_data wrqu;

        skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
        if (!skb) {
                printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
                       "response\n", sdata->dev->name);
                return -ENOMEM;
        }

        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

        /* Remove possible STA entries from other IBSS networks. */
        sta_info_flush_delayed(sdata);

        if (local->ops->reset_tsf) {
                /* Reset own TSF to allow time synchronization work. */
                local->ops->reset_tsf(local_to_hw(local));
        }
        memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
        res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
        if (res)
                return res;

        local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;

        sdata->drop_unencrypted = bss->capability &
                WLAN_CAPABILITY_PRIVACY ? 1 : 0;

        res = ieee80211_set_freq(sdata, bss->freq);

        if (res)
                return res;

        /* Build IBSS probe response */

        skb_reserve(skb, local->hw.extra_tx_headroom);

        mgmt = (struct ieee80211_mgmt *)
                skb_put(skb, 24 + sizeof(mgmt->u.beacon));
        memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                                IEEE80211_STYPE_PROBE_RESP);
        memset(mgmt->da, 0xff, ETH_ALEN);
        memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
        memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
        mgmt->u.beacon.beacon_int =
                cpu_to_le16(local->hw.conf.beacon_int);
        mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
        mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);

        pos = skb_put(skb, 2 + ifsta->ssid_len);
        *pos++ = WLAN_EID_SSID;
        *pos++ = ifsta->ssid_len;
        memcpy(pos, ifsta->ssid, ifsta->ssid_len);

        rates = bss->supp_rates_len;
        if (rates > 8)
                rates = 8;
        pos = skb_put(skb, 2 + rates);
        *pos++ = WLAN_EID_SUPP_RATES;
        *pos++ = rates;
        memcpy(pos, bss->supp_rates, rates);

        if (bss->band == IEEE80211_BAND_2GHZ) {
                pos = skb_put(skb, 2 + 1);
                *pos++ = WLAN_EID_DS_PARAMS;
                *pos++ = 1;
                *pos++ = ieee80211_frequency_to_channel(bss->freq);
        }

        pos = skb_put(skb, 2 + 2);
        *pos++ = WLAN_EID_IBSS_PARAMS;
        *pos++ = 2;
        /* FIX: set ATIM window based on scan results */
        *pos++ = 0;
        *pos++ = 0;

        if (bss->supp_rates_len > 8) {
                rates = bss->supp_rates_len - 8;
                pos = skb_put(skb, 2 + rates);
                *pos++ = WLAN_EID_EXT_SUPP_RATES;
                *pos++ = rates;
                memcpy(pos, &bss->supp_rates[8], rates);
        }

        ifsta->probe_resp = skb;

        ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);


        rates = 0;
        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
        for (i = 0; i < bss->supp_rates_len; i++) {
                int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
                for (j = 0; j < sband->n_bitrates; j++)
                        if (sband->bitrates[j].bitrate == bitrate)
                                rates |= BIT(j);
        }
        ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;

        ieee80211_sta_def_wmm_params(sdata, bss);

        ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
        mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);

        ieee80211_led_assoc(local, true);

        memset(&wrqu, 0, sizeof(wrqu));
        memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
        wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);

        return res;
}

static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
                                  struct ieee80211_mgmt *mgmt,
                                  size_t len,
                                  struct ieee80211_rx_status *rx_status,
                                  struct ieee802_11_elems *elems,
                                  bool beacon)
{
        struct ieee80211_local *local = sdata->local;
        int freq;
        struct ieee80211_bss *bss;
        struct sta_info *sta;
        struct ieee80211_channel *channel;
        u64 beacon_timestamp, rx_timestamp;
        u64 supp_rates = 0;
        enum ieee80211_band band = rx_status->band;

        if (elems->ds_params && elems->ds_params_len == 1)
                freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
        else
                freq = rx_status->freq;

        channel = ieee80211_get_channel(local->hw.wiphy, freq);

        if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
                return;

        if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
            memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
                supp_rates = ieee80211_sta_get_rates(local, elems, band);

                rcu_read_lock();

                sta = sta_info_get(local, mgmt->sa);
                if (sta) {
                        u64 prev_rates;

                        prev_rates = sta->sta.supp_rates[band];
                        /* make sure mandatory rates are always added */
                        sta->sta.supp_rates[band] = supp_rates |
                                ieee80211_mandatory_rates(local, band);

#ifdef CONFIG_MAC80211_IBSS_DEBUG
                        if (sta->sta.supp_rates[band] != prev_rates)
                                printk(KERN_DEBUG "%s: updated supp_rates set "
                                    "for %pM based on beacon info (0x%llx | "
                                    "0x%llx -> 0x%llx)\n",
                                    sdata->dev->name,
                                    sta->sta.addr,
                                    (unsigned long long) prev_rates,
                                    (unsigned long long) supp_rates,
                                    (unsigned long long) sta->sta.supp_rates[band]);
#endif
                } else {
                        ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
                }

                rcu_read_unlock();
        }

        bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
                                        freq, beacon);
        if (!bss)
                return;

        if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
            (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
                struct ieee80211_channel_sw_ie *sw_elem =
                        (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
                ieee80211_process_chanswitch(sdata, sw_elem, bss);
        }

        /* was just updated in ieee80211_bss_info_update */
        beacon_timestamp = bss->timestamp;

        /*
         * In STA mode, the remaining parameters should not be overridden
         * by beacons because they're not necessarily accurate there.
         */
        if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
            bss->last_probe_resp && beacon) {
                ieee80211_rx_bss_put(local, bss);
                return;
        }

        /* check if we need to merge IBSS */
        if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
            (!(sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)) &&
            bss->capability & WLAN_CAPABILITY_IBSS &&
            bss->freq == local->oper_channel->center_freq &&
            elems->ssid_len == sdata->u.sta.ssid_len &&
            memcmp(elems->ssid, sdata->u.sta.ssid,
                                sdata->u.sta.ssid_len) == 0) {
                if (rx_status->flag & RX_FLAG_TSFT) {
                        /* in order for correct IBSS merging we need mactime
                         *
                         * since mactime is defined as the time the first data
                         * symbol of the frame hits the PHY, and the timestamp
                         * of the beacon is defined as "the time that the data
                         * symbol containing the first bit of the timestamp is
                         * transmitted to the PHY plus the transmitting STA’s
                         * delays through its local PHY from the MAC-PHY
                         * interface to its interface with the WM"
                         * (802.11 11.1.2) - equals the time this bit arrives at
                         * the receiver - we have to take into account the
                         * offset between the two.
                         * e.g: at 1 MBit that means mactime is 192 usec earlier
                         * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
                         */
                        int rate;
                        if (rx_status->flag & RX_FLAG_HT) {
                                rate = 65; /* TODO: HT rates */
                        } else {
                                rate = local->hw.wiphy->bands[band]->
                                        bitrates[rx_status->rate_idx].bitrate;
                        }
                        rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
                } else if (local && local->ops && local->ops->get_tsf)
                        /* second best option: get current TSF */
                        rx_timestamp = local->ops->get_tsf(local_to_hw(local));
                else
                        /* can't merge without knowing the TSF */
                        rx_timestamp = -1LLU;
#ifdef CONFIG_MAC80211_IBSS_DEBUG
                printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
                       "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
                       mgmt->sa, mgmt->bssid,
                       (unsigned long long)rx_timestamp,
                       (unsigned long long)beacon_timestamp,
                       (unsigned long long)(rx_timestamp - beacon_timestamp),
                       jiffies);
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
                if (beacon_timestamp > rx_timestamp) {
#ifdef CONFIG_MAC80211_IBSS_DEBUG
                        printk(KERN_DEBUG "%s: beacon TSF higher than "
                               "local TSF - IBSS merge with BSSID %pM\n",
                               sdata->dev->name, mgmt->bssid);
#endif
                        ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
                        ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
                }
        }

        ieee80211_rx_bss_put(local, bss);
}


static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
                                         struct ieee80211_mgmt *mgmt,
                                         size_t len,
                                         struct ieee80211_rx_status *rx_status)
{
        size_t baselen;
        struct ieee802_11_elems elems;
        struct ieee80211_if_sta *ifsta = &sdata->u.sta;

        if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
                return; /* ignore ProbeResp to foreign address */

        baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
        if (baselen > len)
                return;

        ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
                                &elems);

        ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);

        /* direct probe may be part of the association flow */
        if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
                                                        &ifsta->request)) {
                printk(KERN_DEBUG "%s direct probe responded\n",
                       sdata->dev->name);
                ieee80211_authenticate(sdata, ifsta);
        }
}


static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_mgmt *mgmt,
                                     size_t len,
                                     struct ieee80211_rx_status *rx_status)
{
        struct ieee80211_if_sta *ifsta;
        size_t baselen;
        struct ieee802_11_elems elems;
        struct ieee80211_local *local = sdata->local;
        u32 changed = 0;
        bool erp_valid, directed_tim, is_mc = false;
        u8 erp_value = 0;

        /* Process beacon from the current BSS */
        baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
        if (baselen > len)
                return;

        ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);

        ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);

        if (sdata->vif.type != NL80211_IFTYPE_STATION)
                return;
        ifsta = &sdata->u.sta;

        if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
            memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
                return;

        if (rx_status->freq != local->hw.conf.channel->center_freq)
                return;

        ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
                                 elems.wmm_param_len);

        if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK &&
            local->hw.conf.flags & IEEE80211_CONF_PS) {
                directed_tim = check_tim(&elems, ifsta->aid, &is_mc);

                if (directed_tim || is_mc) {
                        local->hw.conf.flags &= ~IEEE80211_CONF_PS;
                        ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
                        ieee80211_send_nullfunc(local, sdata, 0);
                }
        }

        if (elems.erp_info && elems.erp_info_len >= 1) {
                erp_valid = true;
                erp_value = elems.erp_info[0];
        } else {
                erp_valid = false;
        }
        changed |= ieee80211_handle_bss_capability(sdata,
                        le16_to_cpu(mgmt->u.beacon.capab_info),
                        erp_valid, erp_value);


        if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
                struct sta_info *sta;
                struct ieee80211_supported_band *sband;
                u16 ap_ht_cap_flags;

                rcu_read_lock();

                sta = sta_info_get(local, ifsta->bssid);
                if (!sta) {
                        rcu_read_unlock();
                        return;
                }

                sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

                ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
                                elems.ht_cap_elem, &sta->sta.ht_cap);

                ap_ht_cap_flags = sta->sta.ht_cap.cap;

                rcu_read_unlock();

                changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
                                               ap_ht_cap_flags);
        }

        if (elems.country_elem) {
                /* Note we are only reviewing this on beacons
                 * for the BSSID we are associated to */
                regulatory_hint_11d(local->hw.wiphy,
                        elems.country_elem, elems.country_elem_len);
        }

        ieee80211_bss_info_change_notify(sdata, changed);
}


static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
                                        struct ieee80211_if_sta *ifsta,
                                        struct ieee80211_mgmt *mgmt,
                                        size_t len)
{
        struct ieee80211_local *local = sdata->local;
        int tx_last_beacon;
        struct sk_buff *skb;
        struct ieee80211_mgmt *resp;
        u8 *pos, *end;

        if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
            ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
            len < 24 + 2 || !ifsta->probe_resp)
                return;

        if (local->ops->tx_last_beacon)
                tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
        else
                tx_last_beacon = 1;

#ifdef CONFIG_MAC80211_IBSS_DEBUG
        printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
               " (tx_last_beacon=%d)\n",
               sdata->dev->name, mgmt->sa, mgmt->da,
               mgmt->bssid, tx_last_beacon);
#endif /* CONFIG_MAC80211_IBSS_DEBUG */

        if (!tx_last_beacon)
                return;

        if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
            memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
                return;

        end = ((u8 *) mgmt) + len;
        pos = mgmt->u.probe_req.variable;
        if (pos[0] != WLAN_EID_SSID ||
            pos + 2 + pos[1] > end) {
#ifdef CONFIG_MAC80211_IBSS_DEBUG
                printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
                       "from %pM\n",
                       sdata->dev->name, mgmt->sa);
#endif
                return;
        }
        if (pos[1] != 0 &&
            (pos[1] != ifsta->ssid_len ||
             memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
                /* Ignore ProbeReq for foreign SSID */
                return;
        }

        /* Reply with ProbeResp */
        skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
        if (!skb)
                return;

        resp = (struct ieee80211_mgmt *) skb->data;
        memcpy(resp->da, mgmt->sa, ETH_ALEN);
#ifdef CONFIG_MAC80211_IBSS_DEBUG
        printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
               sdata->dev->name, resp->da);
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
        ieee80211_tx_skb(sdata, skb, 0);
}

void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
                           struct ieee80211_rx_status *rx_status)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_sta *ifsta;
        struct ieee80211_mgmt *mgmt;
        u16 fc;

        if (skb->len < 24)
                goto fail;

        ifsta = &sdata->u.sta;

        mgmt = (struct ieee80211_mgmt *) skb->data;
        fc = le16_to_cpu(mgmt->frame_control);

        switch (fc & IEEE80211_FCTL_STYPE) {
        case IEEE80211_STYPE_PROBE_REQ:
        case IEEE80211_STYPE_PROBE_RESP:
        case IEEE80211_STYPE_BEACON:
                memcpy(skb->cb, rx_status, sizeof(*rx_status));
        case IEEE80211_STYPE_AUTH:
        case IEEE80211_STYPE_ASSOC_RESP:
        case IEEE80211_STYPE_REASSOC_RESP:
        case IEEE80211_STYPE_DEAUTH:
        case IEEE80211_STYPE_DISASSOC:
                skb_queue_tail(&ifsta->skb_queue, skb);
                queue_work(local->hw.workqueue, &ifsta->work);
                return;
        }

 fail:
        kfree_skb(skb);
}

static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
                                         struct sk_buff *skb)
{
        struct ieee80211_rx_status *rx_status;
        struct ieee80211_if_sta *ifsta;
        struct ieee80211_mgmt *mgmt;
        u16 fc;

        ifsta = &sdata->u.sta;

        rx_status = (struct ieee80211_rx_status *) skb->cb;
        mgmt = (struct ieee80211_mgmt *) skb->data;
        fc = le16_to_cpu(mgmt->frame_control);

        switch (fc & IEEE80211_FCTL_STYPE) {
        case IEEE80211_STYPE_PROBE_REQ:
                ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len);
                break;
        case IEEE80211_STYPE_PROBE_RESP:
                ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
                break;
        case IEEE80211_STYPE_BEACON:
                ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
                break;
        case IEEE80211_STYPE_AUTH:
                ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
                break;
        case IEEE80211_STYPE_ASSOC_RESP:
                ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
                break;
        case IEEE80211_STYPE_REASSOC_RESP:
                ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
                break;
        case IEEE80211_STYPE_DEAUTH:
                ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
                break;
        case IEEE80211_STYPE_DISASSOC:
                ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
                break;
        }

        kfree_skb(skb);
}


static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_local *local = sdata->local;
        int active = 0;
        struct sta_info *sta;

        rcu_read_lock();

        list_for_each_entry_rcu(sta, &local->sta_list, list) {
                if (sta->sdata == sdata &&
                    time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
                               jiffies)) {
                        active++;
                        break;
                }
        }

        rcu_read_unlock();

        return active;
}


static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_if_sta *ifsta)
{
        mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);

        ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
        if (ieee80211_sta_active_ibss(sdata))
                return;

        if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
            (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
                return;

        printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
               "IBSS networks with same SSID (merge)\n", sdata->dev->name);
        ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
}


static void ieee80211_sta_timer(unsigned long data)
{
        struct ieee80211_sub_if_data *sdata =
                (struct ieee80211_sub_if_data *) data;
        struct ieee80211_if_sta *ifsta = &sdata->u.sta;
        struct ieee80211_local *local = sdata->local;

        set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
        queue_work(local->hw.workqueue, &ifsta->work);
}

static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_if_sta *ifsta)
{
        struct ieee80211_local *local = sdata->local;

        if (local->ops->reset_tsf) {
                /* Reset own TSF to allow time synchronization work. */
                local->ops->reset_tsf(local_to_hw(local));
        }

        ifsta->wmm_last_param_set = -1; /* allow any WMM update */


        if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
                ifsta->auth_alg = WLAN_AUTH_OPEN;
        else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
                ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
        else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
                ifsta->auth_alg = WLAN_AUTH_LEAP;
        else
                ifsta->auth_alg = WLAN_AUTH_OPEN;
        ifsta->auth_transaction = -1;
        ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
        ifsta->assoc_scan_tries = 0;
        ifsta->direct_probe_tries = 0;
        ifsta->auth_tries = 0;
        ifsta->assoc_tries = 0;
        netif_tx_stop_all_queues(sdata->dev);
        netif_carrier_off(sdata->dev);
}


static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
                                    const char *ssid, int ssid_len)
{
        int tmp, hidden_ssid;

        if (ssid_len == ifsta->ssid_len &&
            !memcmp(ifsta->ssid, ssid, ssid_len))
                return 1;

        if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
                return 0;

        hidden_ssid = 1;
        tmp = ssid_len;
        while (tmp--) {
                if (ssid[tmp] != '\0') {
                        hidden_ssid = 0;
                        break;
                }
        }

        if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
                return 1;

        if (ssid_len == 1 && ssid[0] == ' ')
                return 1;

        return 0;
}

static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_if_sta *ifsta)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_bss *bss;
        struct ieee80211_supported_band *sband;
        u8 bssid[ETH_ALEN], *pos;
        int i;
        int ret;

#if 0
        /* Easier testing, use fixed BSSID. */
        memset(bssid, 0xfe, ETH_ALEN);
#else
        /* Generate random, not broadcast, locally administered BSSID. Mix in
         * own MAC address to make sure that devices that do not have proper
         * random number generator get different BSSID. */
        get_random_bytes(bssid, ETH_ALEN);
        for (i = 0; i < ETH_ALEN; i++)
                bssid[i] ^= sdata->dev->dev_addr[i];
        bssid[0] &= ~0x01;
        bssid[0] |= 0x02;
#endif

        printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
               sdata->dev->name, bssid);

        bss = ieee80211_rx_bss_add(local, bssid,
                                   local->hw.conf.channel->center_freq,
                                   sdata->u.sta.ssid, sdata->u.sta.ssid_len);
        if (!bss)
                return -ENOMEM;

        bss->band = local->hw.conf.channel->band;
        sband = local->hw.wiphy->bands[bss->band];

        if (local->hw.conf.beacon_int == 0)
                local->hw.conf.beacon_int = 100;
        bss->beacon_int = local->hw.conf.beacon_int;
        bss->last_update = jiffies;
        bss->capability = WLAN_CAPABILITY_IBSS;

        if (sdata->default_key)
                bss->capability |= WLAN_CAPABILITY_PRIVACY;
        else
                sdata->drop_unencrypted = 0;

        bss->supp_rates_len = sband->n_bitrates;
        pos = bss->supp_rates;
        for (i = 0; i < sband->n_bitrates; i++) {
                int rate = sband->bitrates[i].bitrate;
                *pos++ = (u8) (rate / 5);
        }

        ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
        ieee80211_rx_bss_put(local, bss);
        return ret;
}


static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
                                   struct ieee80211_if_sta *ifsta)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_bss *bss;
        int found = 0;
        u8 bssid[ETH_ALEN];
        int active_ibss;

        if (ifsta->ssid_len == 0)
                return -EINVAL;

        active_ibss = ieee80211_sta_active_ibss(sdata);
#ifdef CONFIG_MAC80211_IBSS_DEBUG
        printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
               sdata->dev->name, active_ibss);
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
        spin_lock_bh(&local->bss_lock);
        list_for_each_entry(bss, &local->bss_list, list) {
                if (ifsta->ssid_len != bss->ssid_len ||
                    memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
                    || !(bss->capability & WLAN_CAPABILITY_IBSS))
                        continue;
#ifdef CONFIG_MAC80211_IBSS_DEBUG
                printk(KERN_DEBUG "   bssid=%pM found\n", bss->bssid);
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
                memcpy(bssid, bss->bssid, ETH_ALEN);
                found = 1;
                if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
                        break;
        }
        spin_unlock_bh(&local->bss_lock);

#ifdef CONFIG_MAC80211_IBSS_DEBUG
        if (found)
                printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
                       "%pM\n", bssid, ifsta->bssid);
#endif /* CONFIG_MAC80211_IBSS_DEBUG */

        if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
                int ret;
                int search_freq;

                if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
                        search_freq = bss->freq;
                else
                        search_freq = local->hw.conf.channel->center_freq;

                bss = ieee80211_rx_bss_get(local, bssid, search_freq,
                                           ifsta->ssid, ifsta->ssid_len);
                if (!bss)
                        goto dont_join;

                printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
                       " based on configured SSID\n",
                       sdata->dev->name, bssid);
                ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
                ieee80211_rx_bss_put(local, bss);
                return ret;
        }

dont_join:
#ifdef CONFIG_MAC80211_IBSS_DEBUG
        printk(KERN_DEBUG "   did not try to join ibss\n");
#endif /* CONFIG_MAC80211_IBSS_DEBUG */

        /* Selected IBSS not found in current scan results - try to scan */
        if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
            !ieee80211_sta_active_ibss(sdata)) {
                mod_timer(&ifsta->timer, jiffies +
                                      IEEE80211_IBSS_MERGE_INTERVAL);
        } else if (time_after(jiffies, local->last_scan_completed +
                              IEEE80211_SCAN_INTERVAL)) {
                printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
                       "join\n", sdata->dev->name);
                return ieee80211_request_scan(sdata, ifsta->ssid,
                                              ifsta->ssid_len);
        } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
                int interval = IEEE80211_SCAN_INTERVAL;

                if (time_after(jiffies, ifsta->ibss_join_req +
                               IEEE80211_IBSS_JOIN_TIMEOUT)) {
                        if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
                            (!(local->oper_channel->flags &
                                        IEEE80211_CHAN_NO_IBSS)))
                                return ieee80211_sta_create_ibss(sdata, ifsta);
                        if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
                                printk(KERN_DEBUG "%s: IBSS not allowed on"
                                       " %d MHz\n", sdata->dev->name,
                                       local->hw.conf.channel->center_freq);
                        }

                        /* No IBSS found - decrease scan interval and continue
                         * scanning. */
                        interval = IEEE80211_SCAN_INTERVAL_SLOW;
                }

                ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
                mod_timer(&ifsta->timer, jiffies + interval);
                return 0;
        }

        return 0;
}


static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_if_sta *ifsta)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_bss *bss, *selected = NULL;
        int top_rssi = 0, freq;

        spin_lock_bh(&local->bss_lock);
        freq = local->oper_channel->center_freq;
        list_for_each_entry(bss, &local->bss_list, list) {
                if (!(bss->capability & WLAN_CAPABILITY_ESS))
                        continue;

                if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
                        IEEE80211_STA_AUTO_BSSID_SEL |
                        IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
                    (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
                     !!sdata->default_key))
                        continue;

                if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
                    bss->freq != freq)
                        continue;

                if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
                    memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
                        continue;

                if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
                    !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
                        continue;

                if (!selected || top_rssi < bss->signal) {
                        selected = bss;
                        top_rssi = bss->signal;
                }
        }
        if (selected)
                atomic_inc(&selected->users);
        spin_unlock_bh(&local->bss_lock);

        if (selected) {
                ieee80211_set_freq(sdata, selected->freq);
                if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
                        ieee80211_sta_set_ssid(sdata, selected->ssid,
                                               selected->ssid_len);
                ieee80211_sta_set_bssid(sdata, selected->bssid);
                ieee80211_sta_def_wmm_params(sdata, selected);
                if (sdata->u.sta.mfp == IEEE80211_MFP_REQUIRED)
                        sdata->u.sta.flags |= IEEE80211_STA_MFP_ENABLED;
                else
                        sdata->u.sta.flags &= ~IEEE80211_STA_MFP_ENABLED;

                /* Send out direct probe if no probe resp was received or
                 * the one we have is outdated
                 */
                if (!selected->last_probe_resp ||
                    time_after(jiffies, selected->last_probe_resp
                                        + IEEE80211_SCAN_RESULT_EXPIRE))
                        ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
                else
                        ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;

                ieee80211_rx_bss_put(local, selected);
                ieee80211_sta_reset_auth(sdata, ifsta);
                return 0;
        } else {
                if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
                        ifsta->assoc_scan_tries++;
                        if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
                                ieee80211_start_scan(sdata, NULL, 0);
                        else
                                ieee80211_start_scan(sdata, ifsta->ssid,
                                                         ifsta->ssid_len);
                        ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
                        set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
                } else
                        ifsta->state = IEEE80211_STA_MLME_DISABLED;
        }
        return -1;
}


static void ieee80211_sta_work(struct work_struct *work)
{
        struct ieee80211_sub_if_data *sdata =
                container_of(work, struct ieee80211_sub_if_data, u.sta.work);
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_sta *ifsta;
        struct sk_buff *skb;

        if (!netif_running(sdata->dev))
                return;

        if (local->sw_scanning || local->hw_scanning)
                return;

        if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
                    sdata->vif.type != NL80211_IFTYPE_ADHOC))
                return;
        ifsta = &sdata->u.sta;

        while ((skb = skb_dequeue(&ifsta->skb_queue)))
                ieee80211_sta_rx_queued_mgmt(sdata, skb);

        if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
            ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
            ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
            test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
                ieee80211_start_scan(sdata, ifsta->scan_ssid,
                                     ifsta->scan_ssid_len);
                return;
        }

        if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
                if (ieee80211_sta_config_auth(sdata, ifsta))
                        return;
                clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
        } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
                return;

        switch (ifsta->state) {
        case IEEE80211_STA_MLME_DISABLED:
                break;
        case IEEE80211_STA_MLME_DIRECT_PROBE:
                ieee80211_direct_probe(sdata, ifsta);
                break;
        case IEEE80211_STA_MLME_AUTHENTICATE:
                ieee80211_authenticate(sdata, ifsta);
                break;
        case IEEE80211_STA_MLME_ASSOCIATE:
                ieee80211_associate(sdata, ifsta);
                break;
        case IEEE80211_STA_MLME_ASSOCIATED:
                ieee80211_associated(sdata, ifsta);
                break;
        case IEEE80211_STA_MLME_IBSS_SEARCH:
                ieee80211_sta_find_ibss(sdata, ifsta);
                break;
        case IEEE80211_STA_MLME_IBSS_JOINED:
                ieee80211_sta_merge_ibss(sdata, ifsta);
                break;
        default:
                WARN_ON(1);
                break;
        }

        if (ieee80211_privacy_mismatch(sdata, ifsta)) {
                printk(KERN_DEBUG "%s: privacy configuration mismatch and "
                       "mixed-cell disabled - disassociate\n", sdata->dev->name);

                ieee80211_set_disassoc(sdata, ifsta, false, true,
                                        WLAN_REASON_UNSPECIFIED);
        }
}

static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
        if (sdata->vif.type == NL80211_IFTYPE_STATION)
                queue_work(sdata->local->hw.workqueue,
                           &sdata->u.sta.work);
}

/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_if_sta *ifsta;

        ifsta = &sdata->u.sta;
        INIT_WORK(&ifsta->work, ieee80211_sta_work);
        INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
        setup_timer(&ifsta->timer, ieee80211_sta_timer,
                    (unsigned long) sdata);
        setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
                    (unsigned long) sdata);
        skb_queue_head_init(&ifsta->skb_queue);

        ifsta->capab = WLAN_CAPABILITY_ESS;
        ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
                IEEE80211_AUTH_ALG_SHARED_KEY;
        ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
                IEEE80211_STA_AUTO_BSSID_SEL |
                IEEE80211_STA_AUTO_CHANNEL_SEL;
        if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
                ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
}

/*
 * Add a new IBSS station, will also be called by the RX code when,
 * in IBSS mode, receiving a frame from a yet-unknown station, hence
 * must be callable in atomic context.
 */
struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
                                        u8 *bssid,u8 *addr, u64 supp_rates)
{
        struct ieee80211_local *local = sdata->local;
        struct sta_info *sta;
        int band = local->hw.conf.channel->band;

        /* TODO: Could consider removing the least recently used entry and
         * allow new one to be added. */
        if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
                if (net_ratelimit()) {
                        printk(KERN_DEBUG "%s: No room for a new IBSS STA "
                               "entry %pM\n", sdata->dev->name, addr);
                }
                return NULL;
        }

        if (compare_ether_addr(bssid, sdata->u.sta.bssid))
                return NULL;

#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
        printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
               wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
#endif

        sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
        if (!sta)
                return NULL;

        set_sta_flags(sta, WLAN_STA_AUTHORIZED);

        /* make sure mandatory rates are always added */
        sta->sta.supp_rates[band] = supp_rates |
                        ieee80211_mandatory_rates(local, band);

        rate_control_rate_init(sta);

        if (sta_info_insert(sta))
                return NULL;

        return sta;
}

/* configuration hooks */
void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
                            struct ieee80211_if_sta *ifsta)
{
        struct ieee80211_local *local = sdata->local;

        if (sdata->vif.type != NL80211_IFTYPE_STATION)
                return;

        if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
                             IEEE80211_STA_AUTO_BSSID_SEL)) &&
            (ifsta->flags & (IEEE80211_STA_SSID_SET |
                             IEEE80211_STA_AUTO_SSID_SEL))) {

                if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
                        ieee80211_set_disassoc(sdata, ifsta, true, true,
                                               WLAN_REASON_DEAUTH_LEAVING);

                set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
                queue_work(local->hw.workqueue, &ifsta->work);
        }
}

int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
{
        struct ieee80211_if_sta *ifsta;

        if (len > IEEE80211_MAX_SSID_LEN)
                return -EINVAL;

        ifsta = &sdata->u.sta;

        if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
                memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
                memcpy(ifsta->ssid, ssid, len);
                ifsta->ssid_len = len;
                ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
        }

        if (len)
                ifsta->flags |= IEEE80211_STA_SSID_SET;
        else
                ifsta->flags &= ~IEEE80211_STA_SSID_SET;

        if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
            !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
                ifsta->ibss_join_req = jiffies;
                ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
                return ieee80211_sta_find_ibss(sdata, ifsta);
        }

        return 0;
}

int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
{
        struct ieee80211_if_sta *ifsta = &sdata->u.sta;
        memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
        *len = ifsta->ssid_len;
        return 0;
}

int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
{
        struct ieee80211_if_sta *ifsta;
        int res;
        bool valid;

        ifsta = &sdata->u.sta;
        valid = is_valid_ether_addr(bssid);

        if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
                if(valid)
                        memcpy(ifsta->bssid, bssid, ETH_ALEN);
                else
                        memset(ifsta->bssid, 0, ETH_ALEN);
                res = 0;
                /*
                 * Hack! See also ieee80211_sta_set_ssid.
                 */
                if (netif_running(sdata->dev))
                        res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
                if (res) {
                        printk(KERN_DEBUG "%s: Failed to config new BSSID to "
                               "the low-level driver\n", sdata->dev->name);
                        return res;
                }
        }

        if (valid)
                ifsta->flags |= IEEE80211_STA_BSSID_SET;
        else
                ifsta->flags &= ~IEEE80211_STA_BSSID_SET;

        return 0;
}

int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
{
        struct ieee80211_if_sta *ifsta = &sdata->u.sta;

        kfree(ifsta->extra_ie);
        if (len == 0) {
                ifsta->extra_ie = NULL;
                ifsta->extra_ie_len = 0;
                return 0;
        }
        ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
        if (!ifsta->extra_ie) {
                ifsta->extra_ie_len = 0;
                return -ENOMEM;
        }
        memcpy(ifsta->extra_ie, ie, len);
        ifsta->extra_ie_len = len;
        return 0;
}

int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
{
        struct ieee80211_if_sta *ifsta = &sdata->u.sta;

        printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
               sdata->dev->name, reason);

        if (sdata->vif.type != NL80211_IFTYPE_STATION &&
            sdata->vif.type != NL80211_IFTYPE_ADHOC)
                return -EINVAL;

        ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
        return 0;
}

int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
{
        struct ieee80211_if_sta *ifsta = &sdata->u.sta;

        printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
               sdata->dev->name, reason);

        if (sdata->vif.type != NL80211_IFTYPE_STATION)
                return -EINVAL;

        if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
                return -1;

        ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
        return 0;
}

/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
{
        struct ieee80211_sub_if_data *sdata = local->scan_sdata;
        struct ieee80211_if_sta *ifsta;

        if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
                ifsta = &sdata->u.sta;
                if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
                    (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
                    !ieee80211_sta_active_ibss(sdata)))
                        ieee80211_sta_find_ibss(sdata, ifsta);
        }

        /* Restart STA timers */
        rcu_read_lock();
        list_for_each_entry_rcu(sdata, &local->interfaces, list)
                ieee80211_restart_sta_timer(sdata);
        rcu_read_unlock();
}

void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
{
        struct ieee80211_local *local =
                container_of(work, struct ieee80211_local,
                             dynamic_ps_disable_work);

        if (local->hw.conf.flags & IEEE80211_CONF_PS) {
                local->hw.conf.flags &= ~IEEE80211_CONF_PS;
                ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
        }

        ieee80211_wake_queues_by_reason(&local->hw,
                                        IEEE80211_QUEUE_STOP_REASON_PS);
}

void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
{
        struct ieee80211_local *local =
                container_of(work, struct ieee80211_local,
                             dynamic_ps_enable_work);
        struct ieee80211_sub_if_data *sdata = local->scan_sdata;

        if (local->hw.conf.flags & IEEE80211_CONF_PS)
                return;

        if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
                ieee80211_send_nullfunc(local, sdata, 1);

        local->hw.conf.flags |= IEEE80211_CONF_PS;
        ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
}

void ieee80211_dynamic_ps_timer(unsigned long data)
{
        struct ieee80211_local *local = (void *) data;

        queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
}