sta_info.c

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#include "includes.h"

#include "hostapd.h"
#include "sta_info.h"
#include "eloop.h"
#include "accounting.h"
#include "ieee802_1x.h"
#include "ieee802_11.h"
#include "radius/radius.h"
#include "wpa.h"
#include "preauth.h"
#include "radius/radius_client.h"
#include "driver_i.h"
#include "beacon.h"
#include "hw_features.h"
#include "mlme.h"
#include "vlan_init.h"

static int ap_sta_in_other_bss(struct hostapd_data *hapd,
                               struct sta_info *sta, u32 flags);
static void ap_handle_session_timer(void *eloop_ctx, void *timeout_ctx);
#ifdef CONFIG_IEEE80211W
static void ap_sa_query_timer(void *eloop_ctx, void *timeout_ctx);
#endif /* CONFIG_IEEE80211W */

int ap_for_each_sta(struct hostapd_data *hapd,
                    int (*cb)(struct hostapd_data *hapd, struct sta_info *sta,
                              void *ctx),
                    void *ctx)
{
        struct sta_info *sta;

        for (sta = hapd->sta_list; sta; sta = sta->next) {
                if (cb(hapd, sta, ctx))
                        return 1;
        }

        return 0;
}


struct sta_info * ap_get_sta(struct hostapd_data *hapd, const u8 *sta)
{
        struct sta_info *s;

        s = hapd->sta_hash[STA_HASH(sta)];
        while (s != NULL && os_memcmp(s->addr, sta, 6) != 0)
                s = s->hnext;
        return s;
}


static void ap_sta_list_del(struct hostapd_data *hapd, struct sta_info *sta)
{
        struct sta_info *tmp;

        if (hapd->sta_list == sta) {
                hapd->sta_list = sta->next;
                return;
        }

        tmp = hapd->sta_list;
        while (tmp != NULL && tmp->next != sta)
                tmp = tmp->next;
        if (tmp == NULL) {
                wpa_printf(MSG_DEBUG, "Could not remove STA " MACSTR " from "
                           "list.", MAC2STR(sta->addr));
        } else
                tmp->next = sta->next;
}


void ap_sta_hash_add(struct hostapd_data *hapd, struct sta_info *sta)
{
        sta->hnext = hapd->sta_hash[STA_HASH(sta->addr)];
        hapd->sta_hash[STA_HASH(sta->addr)] = sta;
}


static void ap_sta_hash_del(struct hostapd_data *hapd, struct sta_info *sta)
{
        struct sta_info *s;

        s = hapd->sta_hash[STA_HASH(sta->addr)];
        if (s == NULL) return;
        if (os_memcmp(s->addr, sta->addr, 6) == 0) {
                hapd->sta_hash[STA_HASH(sta->addr)] = s->hnext;
                return;
        }

        while (s->hnext != NULL &&
               os_memcmp(s->hnext->addr, sta->addr, ETH_ALEN) != 0)
                s = s->hnext;
        if (s->hnext != NULL)
                s->hnext = s->hnext->hnext;
        else
                wpa_printf(MSG_DEBUG, "AP: could not remove STA " MACSTR
                           " from hash table", MAC2STR(sta->addr));
}


void ap_free_sta(struct hostapd_data *hapd, struct sta_info *sta)
{
        int set_beacon = 0;

        accounting_sta_stop(hapd, sta);

        if (!ap_sta_in_other_bss(hapd, sta, WLAN_STA_ASSOC) &&
            !(sta->flags & WLAN_STA_PREAUTH))
                hostapd_sta_remove(hapd, sta->addr);

        ap_sta_hash_del(hapd, sta);
        ap_sta_list_del(hapd, sta);

        if (sta->aid > 0)
                hapd->sta_aid[(sta->aid - 1) / 32] &=
                        ~BIT((sta->aid - 1) % 32);

        hapd->num_sta--;
        if (sta->nonerp_set) {
                sta->nonerp_set = 0;
                hapd->iface->num_sta_non_erp--;
                if (hapd->iface->num_sta_non_erp == 0)
                        set_beacon++;
        }

        if (sta->no_short_slot_time_set) {
                sta->no_short_slot_time_set = 0;
                hapd->iface->num_sta_no_short_slot_time--;
                if (hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G
                    && hapd->iface->num_sta_no_short_slot_time == 0)
                        set_beacon++;
        }

        if (sta->no_short_preamble_set) {
                sta->no_short_preamble_set = 0;
                hapd->iface->num_sta_no_short_preamble--;
                if (hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G
                    && hapd->iface->num_sta_no_short_preamble == 0)
                        set_beacon++;
        }

#ifdef CONFIG_IEEE80211N
        if (sta->no_ht_gf_set) {
                sta->no_ht_gf_set = 0;
                hapd->iface->num_sta_ht_no_gf--;
        }

        if (sta->no_ht_set) {
                sta->no_ht_set = 0;
                hapd->iface->num_sta_no_ht--;
        }

        if (sta->ht_20mhz_set) {
                sta->ht_20mhz_set = 0;
                hapd->iface->num_sta_ht_20mhz--;
        }

#ifdef NEED_AP_MLME
        if (hostapd_ht_operation_update(hapd->iface) > 0)
                set_beacon++;
#endif /* NEED_AP_MLME */
#endif /* CONFIG_IEEE80211N */

        if (set_beacon)
                ieee802_11_set_beacons(hapd->iface);

        eloop_cancel_timeout(ap_handle_timer, hapd, sta);
        eloop_cancel_timeout(ap_handle_session_timer, hapd, sta);

        ieee802_1x_free_station(sta);
        wpa_auth_sta_deinit(sta->wpa_sm);
        rsn_preauth_free_station(hapd, sta);
        radius_client_flush_auth(hapd->radius, sta->addr);

        os_free(sta->last_assoc_req);
        os_free(sta->challenge);

#ifdef CONFIG_IEEE80211W
        os_free(sta->sa_query_trans_id);
        eloop_cancel_timeout(ap_sa_query_timer, hapd, sta);
#endif /* CONFIG_IEEE80211W */

        wpabuf_free(sta->wps_ie);

        os_free(sta);
}


void hostapd_free_stas(struct hostapd_data *hapd)
{
        struct sta_info *sta, *prev;

        sta = hapd->sta_list;

        while (sta) {
                prev = sta;
                if (sta->flags & WLAN_STA_AUTH) {
                        mlme_deauthenticate_indication(
                                hapd, sta, WLAN_REASON_UNSPECIFIED);
                }
                sta = sta->next;
                wpa_printf(MSG_DEBUG, "Removing station " MACSTR,
                           MAC2STR(prev->addr));
                ap_free_sta(hapd, prev);
        }
}


void ap_handle_timer(void *eloop_ctx, void *timeout_ctx)
{
        struct hostapd_data *hapd = eloop_ctx;
        struct sta_info *sta = timeout_ctx;
        unsigned long next_time = 0;

        if (sta->timeout_next == STA_REMOVE) {
                hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
                               HOSTAPD_LEVEL_INFO, "deauthenticated due to "
                               "local deauth request");
                ap_free_sta(hapd, sta);
                return;
        }

        if ((sta->flags & WLAN_STA_ASSOC) &&
            (sta->timeout_next == STA_NULLFUNC ||
             sta->timeout_next == STA_DISASSOC)) {
                int inactive_sec;
                wpa_printf(MSG_DEBUG, "Checking STA " MACSTR " inactivity:",
                           MAC2STR(sta->addr));
                inactive_sec = hostapd_get_inact_sec(hapd, sta->addr);
                if (inactive_sec == -1) {
                        wpa_printf(MSG_DEBUG, "Could not get station info "
                                   "from kernel driver for " MACSTR ".",
                                   MAC2STR(sta->addr));
                } else if (inactive_sec < hapd->conf->ap_max_inactivity &&
                           sta->flags & WLAN_STA_ASSOC) {
                        /* station activity detected; reset timeout state */
                        wpa_printf(MSG_DEBUG, "  Station has been active");
                        sta->timeout_next = STA_NULLFUNC;
                        next_time = hapd->conf->ap_max_inactivity -
                                inactive_sec;
                }
        }

        if ((sta->flags & WLAN_STA_ASSOC) &&
            sta->timeout_next == STA_DISASSOC &&
            !(sta->flags & WLAN_STA_PENDING_POLL)) {
                wpa_printf(MSG_DEBUG, "  Station has ACKed data poll");
                /* data nullfunc frame poll did not produce TX errors; assume
                 * station ACKed it */
                sta->timeout_next = STA_NULLFUNC;
                next_time = hapd->conf->ap_max_inactivity;
        }

        if (next_time) {
                eloop_register_timeout(next_time, 0, ap_handle_timer, hapd,
                                       sta);
                return;
        }

        if (sta->timeout_next == STA_NULLFUNC &&
            (sta->flags & WLAN_STA_ASSOC)) {
                /* send data frame to poll STA and check whether this frame
                 * is ACKed */
                struct ieee80211_hdr hdr;

                wpa_printf(MSG_DEBUG, "  Polling STA with data frame");
                sta->flags |= WLAN_STA_PENDING_POLL;

#ifndef CONFIG_NATIVE_WINDOWS
                os_memset(&hdr, 0, sizeof(hdr));
                if (hapd->driver &&
                    os_strcmp(hapd->driver->name, "hostap") == 0) {
                        /*
                         * WLAN_FC_STYPE_NULLFUNC would be more appropriate,
                         * but it is apparently not retried so TX Exc events
                         * are not received for it.
                         */
                        hdr.frame_control =
                                IEEE80211_FC(WLAN_FC_TYPE_DATA,
                                             WLAN_FC_STYPE_DATA);
                } else {
                        hdr.frame_control =
                                IEEE80211_FC(WLAN_FC_TYPE_DATA,
                                             WLAN_FC_STYPE_NULLFUNC);
                }

                hdr.frame_control |= host_to_le16(WLAN_FC_FROMDS);
                os_memcpy(hdr.IEEE80211_DA_FROMDS, sta->addr, ETH_ALEN);
                os_memcpy(hdr.IEEE80211_BSSID_FROMDS, hapd->own_addr,
                          ETH_ALEN);
                os_memcpy(hdr.IEEE80211_SA_FROMDS, hapd->own_addr, ETH_ALEN);

                if (hostapd_send_mgmt_frame(hapd, &hdr, sizeof(hdr)) < 0)
                        perror("ap_handle_timer: send");
#endif /* CONFIG_NATIVE_WINDOWS */
        } else if (sta->timeout_next != STA_REMOVE) {
                int deauth = sta->timeout_next == STA_DEAUTH;

                wpa_printf(MSG_DEBUG, "Sending %s info to STA " MACSTR,
                           deauth ? "deauthentication" : "disassociation",
                           MAC2STR(sta->addr));

                if (deauth) {
                        hostapd_sta_deauth(hapd, sta->addr,
                                           WLAN_REASON_PREV_AUTH_NOT_VALID);
                } else {
                        hostapd_sta_disassoc(
                                hapd, sta->addr,
                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
                }
        }

        switch (sta->timeout_next) {
        case STA_NULLFUNC:
                sta->timeout_next = STA_DISASSOC;
                eloop_register_timeout(AP_DISASSOC_DELAY, 0, ap_handle_timer,
                                       hapd, sta);
                break;
        case STA_DISASSOC:
                sta->flags &= ~WLAN_STA_ASSOC;
                ieee802_1x_notify_port_enabled(sta->eapol_sm, 0);
                if (!sta->acct_terminate_cause)
                        sta->acct_terminate_cause =
                                RADIUS_ACCT_TERMINATE_CAUSE_IDLE_TIMEOUT;
                accounting_sta_stop(hapd, sta);
                ieee802_1x_free_station(sta);
                hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
                               HOSTAPD_LEVEL_INFO, "disassociated due to "
                               "inactivity");
                sta->timeout_next = STA_DEAUTH;
                eloop_register_timeout(AP_DEAUTH_DELAY, 0, ap_handle_timer,
                                       hapd, sta);
                mlme_disassociate_indication(
                        hapd, sta, WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
                break;
        case STA_DEAUTH:
        case STA_REMOVE:
                hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
                               HOSTAPD_LEVEL_INFO, "deauthenticated due to "
                               "inactivity");
                if (!sta->acct_terminate_cause)
                        sta->acct_terminate_cause =
                                RADIUS_ACCT_TERMINATE_CAUSE_IDLE_TIMEOUT;
                mlme_deauthenticate_indication(
                        hapd, sta,
                        WLAN_REASON_PREV_AUTH_NOT_VALID);
                ap_free_sta(hapd, sta);
                break;
        }
}


static void ap_handle_session_timer(void *eloop_ctx, void *timeout_ctx)
{
        struct hostapd_data *hapd = eloop_ctx;
        struct sta_info *sta = timeout_ctx;
        u8 addr[ETH_ALEN];

        if (!(sta->flags & WLAN_STA_AUTH))
                return;

        mlme_deauthenticate_indication(hapd, sta,
                                       WLAN_REASON_PREV_AUTH_NOT_VALID);
        hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
                       HOSTAPD_LEVEL_INFO, "deauthenticated due to "
                       "session timeout");
        sta->acct_terminate_cause =
                RADIUS_ACCT_TERMINATE_CAUSE_SESSION_TIMEOUT;
        os_memcpy(addr, sta->addr, ETH_ALEN);
        ap_free_sta(hapd, sta);
        hostapd_sta_deauth(hapd, addr, WLAN_REASON_PREV_AUTH_NOT_VALID);
}


void ap_sta_session_timeout(struct hostapd_data *hapd, struct sta_info *sta,
                            u32 session_timeout)
{
        hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
                       HOSTAPD_LEVEL_DEBUG, "setting session timeout to %d "
                       "seconds", session_timeout);
        eloop_cancel_timeout(ap_handle_session_timer, hapd, sta);
        eloop_register_timeout(session_timeout, 0, ap_handle_session_timer,
                               hapd, sta);
}


void ap_sta_no_session_timeout(struct hostapd_data *hapd, struct sta_info *sta)
{
        eloop_cancel_timeout(ap_handle_session_timer, hapd, sta);
}


struct sta_info * ap_sta_add(struct hostapd_data *hapd, const u8 *addr)
{
        struct sta_info *sta;

        sta = ap_get_sta(hapd, addr);
        if (sta)
                return sta;

        wpa_printf(MSG_DEBUG, "  New STA");
        if (hapd->num_sta >= hapd->conf->max_num_sta) {
                /* FIX: might try to remove some old STAs first? */
                wpa_printf(MSG_DEBUG, "no more room for new STAs (%d/%d)",
                           hapd->num_sta, hapd->conf->max_num_sta);
                return NULL;
        }

        sta = os_zalloc(sizeof(struct sta_info));
        if (sta == NULL) {
                wpa_printf(MSG_ERROR, "malloc failed");
                return NULL;
        }
        sta->acct_interim_interval = hapd->conf->radius->acct_interim_interval;

        /* initialize STA info data */
        eloop_register_timeout(hapd->conf->ap_max_inactivity, 0,
                               ap_handle_timer, hapd, sta);
        os_memcpy(sta->addr, addr, ETH_ALEN);
        sta->next = hapd->sta_list;
        hapd->sta_list = sta;
        hapd->num_sta++;
        ap_sta_hash_add(hapd, sta);
        sta->ssid = &hapd->conf->ssid;

        return sta;
}


static int ap_sta_remove(struct hostapd_data *hapd, struct sta_info *sta)
{
        ieee802_1x_notify_port_enabled(sta->eapol_sm, 0);

        wpa_printf(MSG_DEBUG, "Removing STA " MACSTR " from kernel driver",
                   MAC2STR(sta->addr));
        if (hostapd_sta_remove(hapd, sta->addr) &&
            sta->flags & WLAN_STA_ASSOC) {
                wpa_printf(MSG_DEBUG, "Could not remove station " MACSTR
                           " from kernel driver.", MAC2STR(sta->addr));
                return -1;
        }
        return 0;
}


static int ap_sta_in_other_bss(struct hostapd_data *hapd,
                               struct sta_info *sta, u32 flags)
{
        struct hostapd_iface *iface = hapd->iface;
        size_t i;

        for (i = 0; i < iface->num_bss; i++) {
                struct hostapd_data *bss = iface->bss[i];
                struct sta_info *sta2;
                /* bss should always be set during operation, but it may be
                 * NULL during reconfiguration. Assume the STA is not
                 * associated to another BSS in that case to avoid NULL pointer
                 * dereferences. */
                if (bss == hapd || bss == NULL)
                        continue;
                sta2 = ap_get_sta(bss, sta->addr);
                if (sta2 && ((sta2->flags & flags) == flags))
                        return 1;
        }

        return 0;
}


void ap_sta_disassociate(struct hostapd_data *hapd, struct sta_info *sta,
                         u16 reason)
{
        wpa_printf(MSG_DEBUG, "%s: disassociate STA " MACSTR,
                   hapd->conf->iface, MAC2STR(sta->addr));
        sta->flags &= ~WLAN_STA_ASSOC;
        if (!ap_sta_in_other_bss(hapd, sta, WLAN_STA_ASSOC))
                ap_sta_remove(hapd, sta);
        sta->timeout_next = STA_DEAUTH;
        eloop_cancel_timeout(ap_handle_timer, hapd, sta);
        eloop_register_timeout(AP_MAX_INACTIVITY_AFTER_DISASSOC, 0,
                               ap_handle_timer, hapd, sta);
        accounting_sta_stop(hapd, sta);
        ieee802_1x_free_station(sta);

        mlme_disassociate_indication(hapd, sta, reason);
}


void ap_sta_deauthenticate(struct hostapd_data *hapd, struct sta_info *sta,
                           u16 reason)
{
        wpa_printf(MSG_DEBUG, "%s: deauthenticate STA " MACSTR,
                   hapd->conf->iface, MAC2STR(sta->addr));
        sta->flags &= ~(WLAN_STA_AUTH | WLAN_STA_ASSOC);
        if (!ap_sta_in_other_bss(hapd, sta, WLAN_STA_ASSOC))
                ap_sta_remove(hapd, sta);
        sta->timeout_next = STA_REMOVE;
        eloop_cancel_timeout(ap_handle_timer, hapd, sta);
        eloop_register_timeout(AP_MAX_INACTIVITY_AFTER_DEAUTH, 0,
                               ap_handle_timer, hapd, sta);
        accounting_sta_stop(hapd, sta);
        ieee802_1x_free_station(sta);

        mlme_deauthenticate_indication(hapd, sta, reason);
}


int ap_sta_bind_vlan(struct hostapd_data *hapd, struct sta_info *sta,
                     int old_vlanid)
{
#ifndef CONFIG_NO_VLAN
        const char *iface;
        struct hostapd_vlan *vlan = NULL;

        /*
         * Do not proceed furthur if the vlan id remains same. We do not want
         * duplicate dynamic vlan entries.
         */
        if (sta->vlan_id == old_vlanid)
                return 0;

        /*
         * During 1x reauth, if the vlan id changes, then remove the old id and
         * proceed furthur to add the new one.
         */
        if (old_vlanid > 0)
                vlan_remove_dynamic(hapd, old_vlanid);

        iface = hapd->conf->iface;
        if (sta->ssid->vlan[0])
                iface = sta->ssid->vlan;

        if (sta->ssid->dynamic_vlan == DYNAMIC_VLAN_DISABLED)
                sta->vlan_id = 0;
        else if (sta->vlan_id > 0) {
                vlan = hapd->conf->vlan;
                while (vlan) {
                        if (vlan->vlan_id == sta->vlan_id ||
                            vlan->vlan_id == VLAN_ID_WILDCARD) {
                                iface = vlan->ifname;
                                break;
                        }
                        vlan = vlan->next;
                }
        }

        if (sta->vlan_id > 0 && vlan == NULL) {
                hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
                               HOSTAPD_LEVEL_DEBUG, "could not find VLAN for "
                               "binding station to (vlan_id=%d)",
                               sta->vlan_id);
                return -1;
        } else if (sta->vlan_id > 0 && vlan->vlan_id == VLAN_ID_WILDCARD) {
                vlan = vlan_add_dynamic(hapd, vlan, sta->vlan_id);
                if (vlan == NULL) {
                        hostapd_logger(hapd, sta->addr,
                                       HOSTAPD_MODULE_IEEE80211,
                                       HOSTAPD_LEVEL_DEBUG, "could not add "
                                       "dynamic VLAN interface for vlan_id=%d",
                                       sta->vlan_id);
                        return -1;
                }

                iface = vlan->ifname;
                if (vlan_setup_encryption_dyn(hapd, sta->ssid, iface) != 0) {
                        hostapd_logger(hapd, sta->addr,
                                       HOSTAPD_MODULE_IEEE80211,
                                       HOSTAPD_LEVEL_DEBUG, "could not "
                                       "configure encryption for dynamic VLAN "
                                       "interface for vlan_id=%d",
                                       sta->vlan_id);
                }

                hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
                               HOSTAPD_LEVEL_DEBUG, "added new dynamic VLAN "
                               "interface '%s'", iface);
        } else if (vlan && vlan->vlan_id == sta->vlan_id) {
                if (sta->vlan_id > 0) {
                        vlan->dynamic_vlan++;
                        hostapd_logger(hapd, sta->addr,
                                       HOSTAPD_MODULE_IEEE80211,
                                       HOSTAPD_LEVEL_DEBUG, "updated existing "
                                       "dynamic VLAN interface '%s'", iface);
                }

                /*
                 * Update encryption configuration for statically generated
                 * VLAN interface. This is only used for static WEP
                 * configuration for the case where hostapd did not yet know
                 * which keys are to be used when the interface was added.
                 */
                if (vlan_setup_encryption_dyn(hapd, sta->ssid, iface) != 0) {
                        hostapd_logger(hapd, sta->addr,
                                       HOSTAPD_MODULE_IEEE80211,
                                       HOSTAPD_LEVEL_DEBUG, "could not "
                                       "configure encryption for VLAN "
                                       "interface for vlan_id=%d",
                                       sta->vlan_id);
                }
        }

        hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
                       HOSTAPD_LEVEL_DEBUG, "binding station to interface "
                       "'%s'", iface);

        if (wpa_auth_sta_set_vlan(sta->wpa_sm, sta->vlan_id) < 0)
                wpa_printf(MSG_INFO, "Failed to update VLAN-ID for WPA");

        return hostapd_set_sta_vlan(iface, hapd, sta->addr, sta->vlan_id);
#else /* CONFIG_NO_VLAN */
        return 0;
#endif /* CONFIG_NO_VLAN */
}


#ifdef CONFIG_IEEE80211W

int ap_check_sa_query_timeout(struct hostapd_data *hapd, struct sta_info *sta)
{
        u32 tu;
        struct os_time now, passed;
        os_get_time(&now);
        os_time_sub(&now, &sta->sa_query_start, &passed);
        tu = (passed.sec * 1000000 + passed.usec) / 1024;
        if (hapd->conf->assoc_sa_query_max_timeout < tu) {
                hostapd_logger(hapd, sta->addr,
                               HOSTAPD_MODULE_IEEE80211,
                               HOSTAPD_LEVEL_DEBUG,
                               "association SA Query timed out");
                sta->sa_query_timed_out = 1;
                os_free(sta->sa_query_trans_id);
                sta->sa_query_trans_id = NULL;
                sta->sa_query_count = 0;
                eloop_cancel_timeout(ap_sa_query_timer, hapd, sta);
                return 1;
        }

        return 0;
}


static void ap_sa_query_timer(void *eloop_ctx, void *timeout_ctx)
{
        struct hostapd_data *hapd = eloop_ctx;
        struct sta_info *sta = timeout_ctx;
        unsigned int timeout, sec, usec;
        u8 *trans_id, *nbuf;

        if (sta->sa_query_count > 0 &&
            ap_check_sa_query_timeout(hapd, sta))
                return;

        nbuf = os_realloc(sta->sa_query_trans_id,
                          (sta->sa_query_count + 1) * WLAN_SA_QUERY_TR_ID_LEN);
        if (nbuf == NULL)
                return;
        if (sta->sa_query_count == 0) {
                /* Starting a new SA Query procedure */
                os_get_time(&sta->sa_query_start);
        }
        trans_id = nbuf + sta->sa_query_count * WLAN_SA_QUERY_TR_ID_LEN;
        sta->sa_query_trans_id = nbuf;
        sta->sa_query_count++;

        os_get_random(trans_id, WLAN_SA_QUERY_TR_ID_LEN);

        timeout = hapd->conf->assoc_sa_query_retry_timeout;
        sec = ((timeout / 1000) * 1024) / 1000;
        usec = (timeout % 1000) * 1024;
        eloop_register_timeout(sec, usec, ap_sa_query_timer, hapd, sta);

        hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
                       HOSTAPD_LEVEL_DEBUG,
                       "association SA Query attempt %d", sta->sa_query_count);

#ifdef NEED_AP_MLME
        ieee802_11_send_sa_query_req(hapd, sta->addr, trans_id);
#endif /* NEED_AP_MLME */
}


void ap_sta_start_sa_query(struct hostapd_data *hapd, struct sta_info *sta)
{
        ap_sa_query_timer(hapd, sta);
}


void ap_sta_stop_sa_query(struct hostapd_data *hapd, struct sta_info *sta)
{
        eloop_cancel_timeout(ap_sa_query_timer, hapd, sta);
        os_free(sta->sa_query_trans_id);
        sta->sa_query_trans_id = NULL;
        sta->sa_query_count = 0;
}

#endif /* CONFIG_IEEE80211W */