Use os_calloc() instead of os_zalloc()

[thirdparty/hostap.git] / src / ap / hostapd.c

/*
 * hostapd / Initialization and configuration
 * Copyright (c) 2002-2014, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */

#include "utils/includes.h"

#include "utils/common.h"
#include "utils/eloop.h"
#include "common/ieee802_11_defs.h"
#include "common/wpa_ctrl.h"
#include "radius/radius_client.h"
#include "radius/radius_das.h"
#include "eap_server/tncs.h"
#include "hostapd.h"
#include "authsrv.h"
#include "sta_info.h"
#include "accounting.h"
#include "ap_list.h"
#include "beacon.h"
#include "iapp.h"
#include "ieee802_1x.h"
#include "ieee802_11_auth.h"
#include "vlan_init.h"
#include "wpa_auth.h"
#include "wps_hostapd.h"
#include "hw_features.h"
#include "wpa_auth_glue.h"
#include "ap_drv_ops.h"
#include "ap_config.h"
#include "p2p_hostapd.h"
#include "gas_serv.h"
#include "dfs.h"
#include "ieee802_11.h"
#include "bss_load.h"
#include "x_snoop.h"
#include "dhcp_snoop.h"
#include "ndisc_snoop.h"


static int hostapd_flush_old_stations(struct hostapd_data *hapd, u16 reason);
static int hostapd_setup_encryption(char *iface, struct hostapd_data *hapd);
static int hostapd_broadcast_wep_clear(struct hostapd_data *hapd);
static int setup_interface2(struct hostapd_iface *iface);
static void channel_list_update_timeout(void *eloop_ctx, void *timeout_ctx);


int hostapd_for_each_interface(struct hapd_interfaces *interfaces,
                               int (*cb)(struct hostapd_iface *iface,
                                         void *ctx), void *ctx)
{
        size_t i;
        int ret;

        for (i = 0; i < interfaces->count; i++) {
                ret = cb(interfaces->iface[i], ctx);
                if (ret)
                        return ret;
        }

        return 0;
}


static void hostapd_reload_bss(struct hostapd_data *hapd)
{
        struct hostapd_ssid *ssid;

#ifndef CONFIG_NO_RADIUS
        radius_client_reconfig(hapd->radius, hapd->conf->radius);
#endif /* CONFIG_NO_RADIUS */

        ssid = &hapd->conf->ssid;
        if (!ssid->wpa_psk_set && ssid->wpa_psk && !ssid->wpa_psk->next &&
            ssid->wpa_passphrase_set && ssid->wpa_passphrase) {
                /*
                 * Force PSK to be derived again since SSID or passphrase may
                 * have changed.
                 */
                os_free(ssid->wpa_psk);
                ssid->wpa_psk = NULL;
        }
        if (hostapd_setup_wpa_psk(hapd->conf)) {
                wpa_printf(MSG_ERROR, "Failed to re-configure WPA PSK "
                           "after reloading configuration");
        }

        if (hapd->conf->ieee802_1x || hapd->conf->wpa)
                hostapd_set_drv_ieee8021x(hapd, hapd->conf->iface, 1);
        else
                hostapd_set_drv_ieee8021x(hapd, hapd->conf->iface, 0);

        if ((hapd->conf->wpa || hapd->conf->osen) && hapd->wpa_auth == NULL) {
                hostapd_setup_wpa(hapd);
                if (hapd->wpa_auth)
                        wpa_init_keys(hapd->wpa_auth);
        } else if (hapd->conf->wpa) {
                const u8 *wpa_ie;
                size_t wpa_ie_len;
                hostapd_reconfig_wpa(hapd);
                wpa_ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &wpa_ie_len);
                if (hostapd_set_generic_elem(hapd, wpa_ie, wpa_ie_len))
                        wpa_printf(MSG_ERROR, "Failed to configure WPA IE for "
                                   "the kernel driver.");
        } else if (hapd->wpa_auth) {
                wpa_deinit(hapd->wpa_auth);
                hapd->wpa_auth = NULL;
                hostapd_set_privacy(hapd, 0);
                hostapd_setup_encryption(hapd->conf->iface, hapd);
                hostapd_set_generic_elem(hapd, (u8 *) "", 0);
        }

        ieee802_11_set_beacon(hapd);
        hostapd_update_wps(hapd);

        if (hapd->conf->ssid.ssid_set &&
            hostapd_set_ssid(hapd, hapd->conf->ssid.ssid,
                             hapd->conf->ssid.ssid_len)) {
                wpa_printf(MSG_ERROR, "Could not set SSID for kernel driver");
                /* try to continue */
        }
        wpa_printf(MSG_DEBUG, "Reconfigured interface %s", hapd->conf->iface);
}


static void hostapd_clear_old(struct hostapd_iface *iface)
{
        size_t j;

        /*
         * Deauthenticate all stations since the new configuration may not
         * allow them to use the BSS anymore.
         */
        for (j = 0; j < iface->num_bss; j++) {
                hostapd_flush_old_stations(iface->bss[j],
                                           WLAN_REASON_PREV_AUTH_NOT_VALID);
                hostapd_broadcast_wep_clear(iface->bss[j]);

#ifndef CONFIG_NO_RADIUS
                /* TODO: update dynamic data based on changed configuration
                 * items (e.g., open/close sockets, etc.) */
                radius_client_flush(iface->bss[j]->radius, 0);
#endif /* CONFIG_NO_RADIUS */
        }
}


int hostapd_reload_config(struct hostapd_iface *iface)
{
        struct hostapd_data *hapd = iface->bss[0];
        struct hostapd_config *newconf, *oldconf;
        size_t j;

        if (iface->config_fname == NULL) {
                /* Only in-memory config in use - assume it has been updated */
                hostapd_clear_old(iface);
                for (j = 0; j < iface->num_bss; j++)
                        hostapd_reload_bss(iface->bss[j]);
                return 0;
        }

        if (iface->interfaces == NULL ||
            iface->interfaces->config_read_cb == NULL)
                return -1;
        newconf = iface->interfaces->config_read_cb(iface->config_fname);
        if (newconf == NULL)
                return -1;

        hostapd_clear_old(iface);

        oldconf = hapd->iconf;
        iface->conf = newconf;

        for (j = 0; j < iface->num_bss; j++) {
                hapd = iface->bss[j];
                hapd->iconf = newconf;
                hapd->iconf->channel = oldconf->channel;
                hapd->iconf->secondary_channel = oldconf->secondary_channel;
                hapd->iconf->ieee80211n = oldconf->ieee80211n;
                hapd->iconf->ieee80211ac = oldconf->ieee80211ac;
                hapd->iconf->ht_capab = oldconf->ht_capab;
                hapd->iconf->vht_capab = oldconf->vht_capab;
                hapd->iconf->vht_oper_chwidth = oldconf->vht_oper_chwidth;
                hapd->iconf->vht_oper_centr_freq_seg0_idx =
                        oldconf->vht_oper_centr_freq_seg0_idx;
                hapd->iconf->vht_oper_centr_freq_seg1_idx =
                        oldconf->vht_oper_centr_freq_seg1_idx;
                hapd->conf = newconf->bss[j];
                hostapd_reload_bss(hapd);
        }

        hostapd_config_free(oldconf);


        return 0;
}


static void hostapd_broadcast_key_clear_iface(struct hostapd_data *hapd,
                                              char *ifname)
{
        int i;

        for (i = 0; i < NUM_WEP_KEYS; i++) {
                if (hostapd_drv_set_key(ifname, hapd, WPA_ALG_NONE, NULL, i,
                                        0, NULL, 0, NULL, 0)) {
                        wpa_printf(MSG_DEBUG, "Failed to clear default "
                                   "encryption keys (ifname=%s keyidx=%d)",
                                   ifname, i);
                }
        }
#ifdef CONFIG_IEEE80211W
        if (hapd->conf->ieee80211w) {
                for (i = NUM_WEP_KEYS; i < NUM_WEP_KEYS + 2; i++) {
                        if (hostapd_drv_set_key(ifname, hapd, WPA_ALG_NONE,
                                                NULL, i, 0, NULL,
                                                0, NULL, 0)) {
                                wpa_printf(MSG_DEBUG, "Failed to clear "
                                           "default mgmt encryption keys "
                                           "(ifname=%s keyidx=%d)", ifname, i);
                        }
                }
        }
#endif /* CONFIG_IEEE80211W */
}


static int hostapd_broadcast_wep_clear(struct hostapd_data *hapd)
{
        hostapd_broadcast_key_clear_iface(hapd, hapd->conf->iface);
        return 0;
}


static int hostapd_broadcast_wep_set(struct hostapd_data *hapd)
{
        int errors = 0, idx;
        struct hostapd_ssid *ssid = &hapd->conf->ssid;

        idx = ssid->wep.idx;
        if (ssid->wep.default_len &&
            hostapd_drv_set_key(hapd->conf->iface,
                                hapd, WPA_ALG_WEP, broadcast_ether_addr, idx,
                                1, NULL, 0, ssid->wep.key[idx],
                                ssid->wep.len[idx])) {
                wpa_printf(MSG_WARNING, "Could not set WEP encryption.");
                errors++;
        }

        return errors;
}


static void hostapd_free_hapd_data(struct hostapd_data *hapd)
{
        if (!hapd->started) {
                wpa_printf(MSG_ERROR, "%s: Interface %s wasn't started",
                           __func__, hapd->conf->iface);
                return;
        }
        hapd->started = 0;

        wpa_printf(MSG_DEBUG, "%s(%s)", __func__, hapd->conf->iface);
        iapp_deinit(hapd->iapp);
        hapd->iapp = NULL;
        accounting_deinit(hapd);
        hostapd_deinit_wpa(hapd);
        vlan_deinit(hapd);
        hostapd_acl_deinit(hapd);
#ifndef CONFIG_NO_RADIUS
        radius_client_deinit(hapd->radius);
        hapd->radius = NULL;
        radius_das_deinit(hapd->radius_das);
        hapd->radius_das = NULL;
#endif /* CONFIG_NO_RADIUS */

        hostapd_deinit_wps(hapd);

        authsrv_deinit(hapd);

        if (hapd->interface_added) {
                hapd->interface_added = 0;
                if (hostapd_if_remove(hapd, WPA_IF_AP_BSS, hapd->conf->iface)) {
                        wpa_printf(MSG_WARNING,
                                   "Failed to remove BSS interface %s",
                                   hapd->conf->iface);
                        hapd->interface_added = 1;
                } else {
                        /*
                         * Since this was a dynamically added interface, the
                         * driver wrapper may have removed its internal instance
                         * and hapd->drv_priv is not valid anymore.
                         */
                        hapd->drv_priv = NULL;
                }
        }

        os_free(hapd->probereq_cb);
        hapd->probereq_cb = NULL;

#ifdef CONFIG_P2P
        wpabuf_free(hapd->p2p_beacon_ie);
        hapd->p2p_beacon_ie = NULL;
        wpabuf_free(hapd->p2p_probe_resp_ie);
        hapd->p2p_probe_resp_ie = NULL;
#endif /* CONFIG_P2P */

        wpabuf_free(hapd->time_adv);

#ifdef CONFIG_INTERWORKING
        gas_serv_deinit(hapd);
#endif /* CONFIG_INTERWORKING */

        bss_load_update_deinit(hapd);
        ndisc_snoop_deinit(hapd);
        dhcp_snoop_deinit(hapd);
        x_snoop_deinit(hapd);

#ifdef CONFIG_SQLITE
        bin_clear_free(hapd->tmp_eap_user.identity,
                       hapd->tmp_eap_user.identity_len);
        bin_clear_free(hapd->tmp_eap_user.password,
                       hapd->tmp_eap_user.password_len);
#endif /* CONFIG_SQLITE */
}


/**
 * hostapd_cleanup - Per-BSS cleanup (deinitialization)
 * @hapd: Pointer to BSS data
 *
 * This function is used to free all per-BSS data structures and resources.
 * Most of the modules that are initialized in hostapd_setup_bss() are
 * deinitialized here.
 */
static void hostapd_cleanup(struct hostapd_data *hapd)
{
        wpa_printf(MSG_DEBUG, "%s(hapd=%p (%s))", __func__, hapd,
                   hapd->conf->iface);
        if (hapd->iface->interfaces &&
            hapd->iface->interfaces->ctrl_iface_deinit)
                hapd->iface->interfaces->ctrl_iface_deinit(hapd);
        hostapd_free_hapd_data(hapd);
}


static void hostapd_cleanup_iface_partial(struct hostapd_iface *iface)
{
        wpa_printf(MSG_DEBUG, "%s(%p)", __func__, iface);
        hostapd_free_hw_features(iface->hw_features, iface->num_hw_features);
        iface->hw_features = NULL;
        os_free(iface->current_rates);
        iface->current_rates = NULL;
        os_free(iface->basic_rates);
        iface->basic_rates = NULL;
        ap_list_deinit(iface);
}


/**
 * hostapd_cleanup_iface - Complete per-interface cleanup
 * @iface: Pointer to interface data
 *
 * This function is called after per-BSS data structures are deinitialized
 * with hostapd_cleanup().
 */
static void hostapd_cleanup_iface(struct hostapd_iface *iface)
{
        wpa_printf(MSG_DEBUG, "%s(%p)", __func__, iface);
        eloop_cancel_timeout(channel_list_update_timeout, iface, NULL);

        hostapd_cleanup_iface_partial(iface);
        hostapd_config_free(iface->conf);
        iface->conf = NULL;

        os_free(iface->config_fname);
        os_free(iface->bss);
        wpa_printf(MSG_DEBUG, "%s: free iface=%p", __func__, iface);
        os_free(iface);
}


static void hostapd_clear_wep(struct hostapd_data *hapd)
{
        if (hapd->drv_priv && !hapd->iface->driver_ap_teardown) {
                hostapd_set_privacy(hapd, 0);
                hostapd_broadcast_wep_clear(hapd);
        }
}


static int hostapd_setup_encryption(char *iface, struct hostapd_data *hapd)
{
        int i;

        hostapd_broadcast_wep_set(hapd);

        if (hapd->conf->ssid.wep.default_len) {
                hostapd_set_privacy(hapd, 1);
                return 0;
        }

        /*
         * When IEEE 802.1X is not enabled, the driver may need to know how to
         * set authentication algorithms for static WEP.
         */
        hostapd_drv_set_authmode(hapd, hapd->conf->auth_algs);

        for (i = 0; i < 4; i++) {
                if (hapd->conf->ssid.wep.key[i] &&
                    hostapd_drv_set_key(iface, hapd, WPA_ALG_WEP, NULL, i,
                                        i == hapd->conf->ssid.wep.idx, NULL, 0,
                                        hapd->conf->ssid.wep.key[i],
                                        hapd->conf->ssid.wep.len[i])) {
                        wpa_printf(MSG_WARNING, "Could not set WEP "
                                   "encryption.");
                        return -1;
                }
                if (hapd->conf->ssid.wep.key[i] &&
                    i == hapd->conf->ssid.wep.idx)
                        hostapd_set_privacy(hapd, 1);
        }

        return 0;
}


static int hostapd_flush_old_stations(struct hostapd_data *hapd, u16 reason)
{
        int ret = 0;
        u8 addr[ETH_ALEN];

        if (hostapd_drv_none(hapd) || hapd->drv_priv == NULL)
                return 0;

        if (!hapd->iface->driver_ap_teardown) {
                wpa_dbg(hapd->msg_ctx, MSG_DEBUG,
                        "Flushing old station entries");

                if (hostapd_flush(hapd)) {
                        wpa_msg(hapd->msg_ctx, MSG_WARNING,
                                "Could not connect to kernel driver");
                        ret = -1;
                }
        }
        wpa_dbg(hapd->msg_ctx, MSG_DEBUG, "Deauthenticate all stations");
        os_memset(addr, 0xff, ETH_ALEN);
        hostapd_drv_sta_deauth(hapd, addr, reason);
        hostapd_free_stas(hapd);

        return ret;
}


static void hostapd_bss_deinit_no_free(struct hostapd_data *hapd)
{
        hostapd_free_stas(hapd);
        hostapd_flush_old_stations(hapd, WLAN_REASON_DEAUTH_LEAVING);
        hostapd_clear_wep(hapd);
}


/**
 * hostapd_validate_bssid_configuration - Validate BSSID configuration
 * @iface: Pointer to interface data
 * Returns: 0 on success, -1 on failure
 *
 * This function is used to validate that the configured BSSIDs are valid.
 */
static int hostapd_validate_bssid_configuration(struct hostapd_iface *iface)
{
        u8 mask[ETH_ALEN] = { 0 };
        struct hostapd_data *hapd = iface->bss[0];
        unsigned int i = iface->conf->num_bss, bits = 0, j;
        int auto_addr = 0;

        if (hostapd_drv_none(hapd))
                return 0;

        /* Generate BSSID mask that is large enough to cover the BSSIDs. */

        /* Determine the bits necessary to cover the number of BSSIDs. */
        for (i--; i; i >>= 1)
                bits++;

        /* Determine the bits necessary to any configured BSSIDs,
           if they are higher than the number of BSSIDs. */
        for (j = 0; j < iface->conf->num_bss; j++) {
                if (hostapd_mac_comp_empty(iface->conf->bss[j]->bssid) == 0) {
                        if (j)
                                auto_addr++;
                        continue;
                }

                for (i = 0; i < ETH_ALEN; i++) {
                        mask[i] |=
                                iface->conf->bss[j]->bssid[i] ^
                                hapd->own_addr[i];
                }
        }

        if (!auto_addr)
                goto skip_mask_ext;

        for (i = 0; i < ETH_ALEN && mask[i] == 0; i++)
                ;
        j = 0;
        if (i < ETH_ALEN) {
                j = (5 - i) * 8;

                while (mask[i] != 0) {
                        mask[i] >>= 1;
                        j++;
                }
        }

        if (bits < j)
                bits = j;

        if (bits > 40) {
                wpa_printf(MSG_ERROR, "Too many bits in the BSSID mask (%u)",
                           bits);
                return -1;
        }

        os_memset(mask, 0xff, ETH_ALEN);
        j = bits / 8;
        for (i = 5; i > 5 - j; i--)
                mask[i] = 0;
        j = bits % 8;
        while (j--)
                mask[i] <<= 1;

skip_mask_ext:
        wpa_printf(MSG_DEBUG, "BSS count %lu, BSSID mask " MACSTR " (%d bits)",
                   (unsigned long) iface->conf->num_bss, MAC2STR(mask), bits);

        if (!auto_addr)
                return 0;

        for (i = 0; i < ETH_ALEN; i++) {
                if ((hapd->own_addr[i] & mask[i]) != hapd->own_addr[i]) {
                        wpa_printf(MSG_ERROR, "Invalid BSSID mask " MACSTR
                                   " for start address " MACSTR ".",
                                   MAC2STR(mask), MAC2STR(hapd->own_addr));
                        wpa_printf(MSG_ERROR, "Start address must be the "
                                   "first address in the block (i.e., addr "
                                   "AND mask == addr).");
                        return -1;
                }
        }

        return 0;
}


static int mac_in_conf(struct hostapd_config *conf, const void *a)
{
        size_t i;

        for (i = 0; i < conf->num_bss; i++) {
                if (hostapd_mac_comp(conf->bss[i]->bssid, a) == 0) {
                        return 1;
                }
        }

        return 0;
}


#ifndef CONFIG_NO_RADIUS

static int hostapd_das_nas_mismatch(struct hostapd_data *hapd,
                                    struct radius_das_attrs *attr)
{
        if (attr->nas_identifier &&
            (!hapd->conf->nas_identifier ||
             os_strlen(hapd->conf->nas_identifier) !=
             attr->nas_identifier_len ||
             os_memcmp(hapd->conf->nas_identifier, attr->nas_identifier,
                       attr->nas_identifier_len) != 0)) {
                wpa_printf(MSG_DEBUG, "RADIUS DAS: NAS-Identifier mismatch");
                return 1;
        }

        if (attr->nas_ip_addr &&
            (hapd->conf->own_ip_addr.af != AF_INET ||
             os_memcmp(&hapd->conf->own_ip_addr.u.v4, attr->nas_ip_addr, 4) !=
             0)) {
                wpa_printf(MSG_DEBUG, "RADIUS DAS: NAS-IP-Address mismatch");
                return 1;
        }

#ifdef CONFIG_IPV6
        if (attr->nas_ipv6_addr &&
            (hapd->conf->own_ip_addr.af != AF_INET6 ||
             os_memcmp(&hapd->conf->own_ip_addr.u.v6, attr->nas_ipv6_addr, 16)
             != 0)) {
                wpa_printf(MSG_DEBUG, "RADIUS DAS: NAS-IPv6-Address mismatch");
                return 1;
        }
#endif /* CONFIG_IPV6 */

        return 0;
}


static struct sta_info * hostapd_das_find_sta(struct hostapd_data *hapd,
                                              struct radius_das_attrs *attr)
{
        struct sta_info *sta = NULL;
        char buf[128];

        if (attr->sta_addr)
                sta = ap_get_sta(hapd, attr->sta_addr);

        if (sta == NULL && attr->acct_session_id &&
            attr->acct_session_id_len == 17) {
                for (sta = hapd->sta_list; sta; sta = sta->next) {
                        os_snprintf(buf, sizeof(buf), "%08X-%08X",
                                    sta->acct_session_id_hi,
                                    sta->acct_session_id_lo);
                        if (os_memcmp(attr->acct_session_id, buf, 17) == 0)
                                break;
                }
        }

        if (sta == NULL && attr->cui) {
                for (sta = hapd->sta_list; sta; sta = sta->next) {
                        struct wpabuf *cui;
                        cui = ieee802_1x_get_radius_cui(sta->eapol_sm);
                        if (cui && wpabuf_len(cui) == attr->cui_len &&
                            os_memcmp(wpabuf_head(cui), attr->cui,
                                      attr->cui_len) == 0)
                                break;
                }
        }

        if (sta == NULL && attr->user_name) {
                for (sta = hapd->sta_list; sta; sta = sta->next) {
                        u8 *identity;
                        size_t identity_len;
                        identity = ieee802_1x_get_identity(sta->eapol_sm,
                                                           &identity_len);
                        if (identity &&
                            identity_len == attr->user_name_len &&
                            os_memcmp(identity, attr->user_name, identity_len)
                            == 0)
                                break;
                }
        }

        return sta;
}


static enum radius_das_res
hostapd_das_disconnect(void *ctx, struct radius_das_attrs *attr)
{
        struct hostapd_data *hapd = ctx;
        struct sta_info *sta;

        if (hostapd_das_nas_mismatch(hapd, attr))
                return RADIUS_DAS_NAS_MISMATCH;

        sta = hostapd_das_find_sta(hapd, attr);
        if (sta == NULL)
                return RADIUS_DAS_SESSION_NOT_FOUND;

        wpa_auth_pmksa_remove(hapd->wpa_auth, sta->addr);

        hostapd_drv_sta_deauth(hapd, sta->addr,
                               WLAN_REASON_PREV_AUTH_NOT_VALID);
        ap_sta_deauthenticate(hapd, sta, WLAN_REASON_PREV_AUTH_NOT_VALID);

        return RADIUS_DAS_SUCCESS;
}

#endif /* CONFIG_NO_RADIUS */


/**
 * hostapd_setup_bss - Per-BSS setup (initialization)
 * @hapd: Pointer to BSS data
 * @first: Whether this BSS is the first BSS of an interface; -1 = not first,
 *      but interface may exist
 *
 * This function is used to initialize all per-BSS data structures and
 * resources. This gets called in a loop for each BSS when an interface is
 * initialized. Most of the modules that are initialized here will be
 * deinitialized in hostapd_cleanup().
 */
static int hostapd_setup_bss(struct hostapd_data *hapd, int first)
{
        struct hostapd_bss_config *conf = hapd->conf;
        u8 ssid[HOSTAPD_MAX_SSID_LEN + 1];
        int ssid_len, set_ssid;
        char force_ifname[IFNAMSIZ];
        u8 if_addr[ETH_ALEN];
        int flush_old_stations = 1;

        wpa_printf(MSG_DEBUG, "%s(hapd=%p (%s), first=%d)",
                   __func__, hapd, conf->iface, first);

#ifdef EAP_SERVER_TNC
        if (conf->tnc && tncs_global_init() < 0) {
                wpa_printf(MSG_ERROR, "Failed to initialize TNCS");
                return -1;
        }
#endif /* EAP_SERVER_TNC */

        if (hapd->started) {
                wpa_printf(MSG_ERROR, "%s: Interface %s was already started",
                           __func__, conf->iface);
                return -1;
        }
        hapd->started = 1;

        if (!first || first == -1) {
                if (hostapd_mac_comp_empty(conf->bssid) == 0) {
                        /* Allocate the next available BSSID. */
                        do {
                                inc_byte_array(hapd->own_addr, ETH_ALEN);
                        } while (mac_in_conf(hapd->iconf, hapd->own_addr));
                } else {
                        /* Allocate the configured BSSID. */
                        os_memcpy(hapd->own_addr, conf->bssid, ETH_ALEN);

                        if (hostapd_mac_comp(hapd->own_addr,
                                             hapd->iface->bss[0]->own_addr) ==
                            0) {
                                wpa_printf(MSG_ERROR, "BSS '%s' may not have "
                                           "BSSID set to the MAC address of "
                                           "the radio", conf->iface);
                                return -1;
                        }
                }

                hapd->interface_added = 1;
                if (hostapd_if_add(hapd->iface->bss[0], WPA_IF_AP_BSS,
                                   conf->iface, hapd->own_addr, hapd,
                                   &hapd->drv_priv, force_ifname, if_addr,
                                   conf->bridge[0] ? conf->bridge : NULL,
                                   first == -1)) {
                        wpa_printf(MSG_ERROR, "Failed to add BSS (BSSID="
                                   MACSTR ")", MAC2STR(hapd->own_addr));
                        hapd->interface_added = 0;
                        return -1;
                }
        }

        if (conf->wmm_enabled < 0)
                conf->wmm_enabled = hapd->iconf->ieee80211n;

#ifdef CONFIG_MESH
        if (hapd->iface->mconf == NULL)
                flush_old_stations = 0;
#endif /* CONFIG_MESH */

        if (flush_old_stations)
                hostapd_flush_old_stations(hapd,
                                           WLAN_REASON_PREV_AUTH_NOT_VALID);
        hostapd_set_privacy(hapd, 0);

        hostapd_broadcast_wep_clear(hapd);
        if (hostapd_setup_encryption(conf->iface, hapd))
                return -1;

        /*
         * Fetch the SSID from the system and use it or,
         * if one was specified in the config file, verify they
         * match.
         */
        ssid_len = hostapd_get_ssid(hapd, ssid, sizeof(ssid));
        if (ssid_len < 0) {
                wpa_printf(MSG_ERROR, "Could not read SSID from system");
                return -1;
        }
        if (conf->ssid.ssid_set) {
                /*
                 * If SSID is specified in the config file and it differs
                 * from what is being used then force installation of the
                 * new SSID.
                 */
                set_ssid = (conf->ssid.ssid_len != (size_t) ssid_len ||
                            os_memcmp(conf->ssid.ssid, ssid, ssid_len) != 0);
        } else {
                /*
                 * No SSID in the config file; just use the one we got
                 * from the system.
                 */
                set_ssid = 0;
                conf->ssid.ssid_len = ssid_len;
                os_memcpy(conf->ssid.ssid, ssid, conf->ssid.ssid_len);
        }

        if (!hostapd_drv_none(hapd)) {
                wpa_printf(MSG_ERROR, "Using interface %s with hwaddr " MACSTR
                           " and ssid \"%s\"",
                           conf->iface, MAC2STR(hapd->own_addr),
                           wpa_ssid_txt(conf->ssid.ssid, conf->ssid.ssid_len));
        }

        if (hostapd_setup_wpa_psk(conf)) {
                wpa_printf(MSG_ERROR, "WPA-PSK setup failed.");
                return -1;
        }

        /* Set SSID for the kernel driver (to be used in beacon and probe
         * response frames) */
        if (set_ssid && hostapd_set_ssid(hapd, conf->ssid.ssid,
                                         conf->ssid.ssid_len)) {
                wpa_printf(MSG_ERROR, "Could not set SSID for kernel driver");
                return -1;
        }

        if (wpa_debug_level <= MSG_MSGDUMP)
                conf->radius->msg_dumps = 1;
#ifndef CONFIG_NO_RADIUS
        hapd->radius = radius_client_init(hapd, conf->radius);
        if (hapd->radius == NULL) {
                wpa_printf(MSG_ERROR, "RADIUS client initialization failed.");
                return -1;
        }

        if (conf->radius_das_port) {
                struct radius_das_conf das_conf;
                os_memset(&das_conf, 0, sizeof(das_conf));
                das_conf.port = conf->radius_das_port;
                das_conf.shared_secret = conf->radius_das_shared_secret;
                das_conf.shared_secret_len =
                        conf->radius_das_shared_secret_len;
                das_conf.client_addr = &conf->radius_das_client_addr;
                das_conf.time_window = conf->radius_das_time_window;
                das_conf.require_event_timestamp =
                        conf->radius_das_require_event_timestamp;
                das_conf.ctx = hapd;
                das_conf.disconnect = hostapd_das_disconnect;
                hapd->radius_das = radius_das_init(&das_conf);
                if (hapd->radius_das == NULL) {
                        wpa_printf(MSG_ERROR, "RADIUS DAS initialization "
                                   "failed.");
                        return -1;
                }
        }
#endif /* CONFIG_NO_RADIUS */

        if (hostapd_acl_init(hapd)) {
                wpa_printf(MSG_ERROR, "ACL initialization failed.");
                return -1;
        }
        if (hostapd_init_wps(hapd, conf))
                return -1;

        if (authsrv_init(hapd) < 0)
                return -1;

        if (ieee802_1x_init(hapd)) {
                wpa_printf(MSG_ERROR, "IEEE 802.1X initialization failed.");
                return -1;
        }

        if ((conf->wpa || conf->osen) && hostapd_setup_wpa(hapd))
                return -1;

        if (accounting_init(hapd)) {
                wpa_printf(MSG_ERROR, "Accounting initialization failed.");
                return -1;
        }

        if (conf->ieee802_11f &&
            (hapd->iapp = iapp_init(hapd, conf->iapp_iface)) == NULL) {
                wpa_printf(MSG_ERROR, "IEEE 802.11F (IAPP) initialization "
                           "failed.");
                return -1;
        }

#ifdef CONFIG_INTERWORKING
        if (gas_serv_init(hapd)) {
                wpa_printf(MSG_ERROR, "GAS server initialization failed");
                return -1;
        }

        if (conf->qos_map_set_len &&
            hostapd_drv_set_qos_map(hapd, conf->qos_map_set,
                                    conf->qos_map_set_len)) {
                wpa_printf(MSG_ERROR, "Failed to initialize QoS Map");
                return -1;
        }
#endif /* CONFIG_INTERWORKING */

        if (conf->bss_load_update_period && bss_load_update_init(hapd)) {
                wpa_printf(MSG_ERROR, "BSS Load initialization failed");
                return -1;
        }

        if (conf->proxy_arp) {
                if (x_snoop_init(hapd)) {
                        wpa_printf(MSG_ERROR,
                                   "Generic snooping infrastructure initialization failed");
                        return -1;
                }

                if (dhcp_snoop_init(hapd)) {
                        wpa_printf(MSG_ERROR,
                                   "DHCP snooping initialization failed");
                        return -1;
                }

                if (ndisc_snoop_init(hapd)) {
                        wpa_printf(MSG_ERROR,
                                   "Neighbor Discovery snooping initialization failed");
                        return -1;
                }
        }

        if (!hostapd_drv_none(hapd) && vlan_init(hapd)) {
                wpa_printf(MSG_ERROR, "VLAN initialization failed.");
                return -1;
        }

        if (!conf->start_disabled && ieee802_11_set_beacon(hapd) < 0)
                return -1;

        if (hapd->wpa_auth && wpa_init_keys(hapd->wpa_auth) < 0)
                return -1;

        if (hapd->driver && hapd->driver->set_operstate)
                hapd->driver->set_operstate(hapd->drv_priv, 1);

        return 0;
}


static void hostapd_tx_queue_params(struct hostapd_iface *iface)
{
        struct hostapd_data *hapd = iface->bss[0];
        int i;
        struct hostapd_tx_queue_params *p;

#ifdef CONFIG_MESH
        if (iface->mconf == NULL)
                return;
#endif /* CONFIG_MESH */

        for (i = 0; i < NUM_TX_QUEUES; i++) {
                p = &iface->conf->tx_queue[i];

                if (hostapd_set_tx_queue_params(hapd, i, p->aifs, p->cwmin,
                                                p->cwmax, p->burst)) {
                        wpa_printf(MSG_DEBUG, "Failed to set TX queue "
                                   "parameters for queue %d.", i);
                        /* Continue anyway */
                }
        }
}


static int hostapd_set_acl_list(struct hostapd_data *hapd,
                                struct mac_acl_entry *mac_acl,
                                int n_entries, u8 accept_acl)
{
        struct hostapd_acl_params *acl_params;
        int i, err;

        acl_params = os_zalloc(sizeof(*acl_params) +
                               (n_entries * sizeof(acl_params->mac_acl[0])));
        if (!acl_params)
                return -ENOMEM;

        for (i = 0; i < n_entries; i++)
                os_memcpy(acl_params->mac_acl[i].addr, mac_acl[i].addr,
                          ETH_ALEN);

        acl_params->acl_policy = accept_acl;
        acl_params->num_mac_acl = n_entries;

        err = hostapd_drv_set_acl(hapd, acl_params);

        os_free(acl_params);

        return err;
}


static void hostapd_set_acl(struct hostapd_data *hapd)
{
        struct hostapd_config *conf = hapd->iconf;
        int err;
        u8 accept_acl;

        if (hapd->iface->drv_max_acl_mac_addrs == 0)
                return;

        if (conf->bss[0]->macaddr_acl == DENY_UNLESS_ACCEPTED) {
                accept_acl = 1;
                err = hostapd_set_acl_list(hapd, conf->bss[0]->accept_mac,
                                           conf->bss[0]->num_accept_mac,
                                           accept_acl);
                if (err) {
                        wpa_printf(MSG_DEBUG, "Failed to set accept acl");
                        return;
                }
        } else if (conf->bss[0]->macaddr_acl == ACCEPT_UNLESS_DENIED) {
                accept_acl = 0;
                err = hostapd_set_acl_list(hapd, conf->bss[0]->deny_mac,
                                           conf->bss[0]->num_deny_mac,
                                           accept_acl);
                if (err) {
                        wpa_printf(MSG_DEBUG, "Failed to set deny acl");
                        return;
                }
        }
}


static int start_ctrl_iface_bss(struct hostapd_data *hapd)
{
        if (!hapd->iface->interfaces ||
            !hapd->iface->interfaces->ctrl_iface_init)
                return 0;

        if (hapd->iface->interfaces->ctrl_iface_init(hapd)) {
                wpa_printf(MSG_ERROR,
                           "Failed to setup control interface for %s",
                           hapd->conf->iface);
                return -1;
        }

        return 0;
}


static int start_ctrl_iface(struct hostapd_iface *iface)
{
        size_t i;

        if (!iface->interfaces || !iface->interfaces->ctrl_iface_init)
                return 0;

        for (i = 0; i < iface->num_bss; i++) {
                struct hostapd_data *hapd = iface->bss[i];
                if (iface->interfaces->ctrl_iface_init(hapd)) {
                        wpa_printf(MSG_ERROR,
                                   "Failed to setup control interface for %s",
                                   hapd->conf->iface);
                        return -1;
                }
        }

        return 0;
}


static void channel_list_update_timeout(void *eloop_ctx, void *timeout_ctx)
{
        struct hostapd_iface *iface = eloop_ctx;

        if (!iface->wait_channel_update) {
                wpa_printf(MSG_INFO, "Channel list update timeout, but interface was not waiting for it");
                return;
        }

        /*
         * It is possible that the existing channel list is acceptable, so try
         * to proceed.
         */
        wpa_printf(MSG_DEBUG, "Channel list update timeout - try to continue anyway");
        setup_interface2(iface);
}


void hostapd_channel_list_updated(struct hostapd_iface *iface, int initiator)
{
        if (!iface->wait_channel_update || initiator != REGDOM_SET_BY_USER)
                return;

        wpa_printf(MSG_DEBUG, "Channel list updated - continue setup");
        eloop_cancel_timeout(channel_list_update_timeout, iface, NULL);
        setup_interface2(iface);
}


static int setup_interface(struct hostapd_iface *iface)
{
        struct hostapd_data *hapd = iface->bss[0];
        size_t i;

        /*
         * It is possible that setup_interface() is called after the interface
         * was disabled etc., in which case driver_ap_teardown is possibly set
         * to 1. Clear it here so any other key/station deletion, which is not
         * part of a teardown flow, would also call the relevant driver
         * callbacks.
         */
        iface->driver_ap_teardown = 0;

        if (!iface->phy[0]) {
                const char *phy = hostapd_drv_get_radio_name(hapd);
                if (phy) {
                        wpa_printf(MSG_DEBUG, "phy: %s", phy);
                        os_strlcpy(iface->phy, phy, sizeof(iface->phy));
                }
        }

        /*
         * Make sure that all BSSes get configured with a pointer to the same
         * driver interface.
         */
        for (i = 1; i < iface->num_bss; i++) {
                iface->bss[i]->driver = hapd->driver;
                iface->bss[i]->drv_priv = hapd->drv_priv;
        }

        if (hostapd_validate_bssid_configuration(iface))
                return -1;

        /*
         * Initialize control interfaces early to allow external monitoring of
         * channel setup operations that may take considerable amount of time
         * especially for DFS cases.
         */
        if (start_ctrl_iface(iface))
                return -1;

        if (hapd->iconf->country[0] && hapd->iconf->country[1]) {
                char country[4], previous_country[4];

                hostapd_set_state(iface, HAPD_IFACE_COUNTRY_UPDATE);
                if (hostapd_get_country(hapd, previous_country) < 0)
                        previous_country[0] = '\0';

                os_memcpy(country, hapd->iconf->country, 3);
                country[3] = '\0';
                if (hostapd_set_country(hapd, country) < 0) {
                        wpa_printf(MSG_ERROR, "Failed to set country code");
                        return -1;
                }

                wpa_printf(MSG_DEBUG, "Previous country code %s, new country code %s",
                           previous_country, country);

                if (os_strncmp(previous_country, country, 2) != 0) {
                        wpa_printf(MSG_DEBUG, "Continue interface setup after channel list update");
                        iface->wait_channel_update = 1;
                        eloop_register_timeout(5, 0,
                                               channel_list_update_timeout,
                                               iface, NULL);
                        return 0;
                }
        }

        return setup_interface2(iface);
}


static int setup_interface2(struct hostapd_iface *iface)
{
        iface->wait_channel_update = 0;

        if (hostapd_get_hw_features(iface)) {
                /* Not all drivers support this yet, so continue without hw
                 * feature data. */
        } else {
                int ret = hostapd_select_hw_mode(iface);
                if (ret < 0) {
                        wpa_printf(MSG_ERROR, "Could not select hw_mode and "
                                   "channel. (%d)", ret);
                        goto fail;
                }
                if (ret == 1) {
                        wpa_printf(MSG_DEBUG, "Interface initialization will be completed in a callback (ACS)");
                        return 0;
                }
                ret = hostapd_check_ht_capab(iface);
                if (ret < 0)
                        goto fail;
                if (ret == 1) {
                        wpa_printf(MSG_DEBUG, "Interface initialization will "
                                   "be completed in a callback");
                        return 0;
                }

                if (iface->conf->ieee80211h)
                        wpa_printf(MSG_DEBUG, "DFS support is enabled");
        }
        return hostapd_setup_interface_complete(iface, 0);

fail:
        hostapd_set_state(iface, HAPD_IFACE_DISABLED);
        wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, AP_EVENT_DISABLED);
        if (iface->interfaces && iface->interfaces->terminate_on_error)
                eloop_terminate();
        return -1;
}


/**
 * hostapd_setup_interface_complete - Complete interface setup
 *
 * This function is called when previous steps in the interface setup has been
 * completed. This can also start operations, e.g., DFS, that will require
 * additional processing before interface is ready to be enabled. Such
 * operations will call this function from eloop callbacks when finished.
 */
int hostapd_setup_interface_complete(struct hostapd_iface *iface, int err)
{
        struct hostapd_data *hapd = iface->bss[0];
        size_t j;
        u8 *prev_addr;
        int delay_apply_cfg = 0;

        if (err)
                goto fail;

        wpa_printf(MSG_DEBUG, "Completing interface initialization");
        if (iface->conf->channel) {
#ifdef NEED_AP_MLME
                int res;
#endif /* NEED_AP_MLME */

                iface->freq = hostapd_hw_get_freq(hapd, iface->conf->channel);
                wpa_printf(MSG_DEBUG, "Mode: %s  Channel: %d  "
                           "Frequency: %d MHz",
                           hostapd_hw_mode_txt(iface->conf->hw_mode),
                           iface->conf->channel, iface->freq);

#ifdef NEED_AP_MLME
                /* Handle DFS only if it is not offloaded to the driver */
                if (!(iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD)) {
                        /* Check DFS */
                        res = hostapd_handle_dfs(iface);
                        if (res <= 0) {
                                if (res < 0)
                                        goto fail;
                                return res;
                        }
                }
#endif /* NEED_AP_MLME */

#ifdef CONFIG_MESH
                if (iface->mconf != NULL) {
                        wpa_printf(MSG_DEBUG,
                                   "%s: Mesh configuration will be applied while joining the mesh network",
                                   iface->bss[0]->conf->iface);
                        delay_apply_cfg = 1;
                }
#endif /* CONFIG_MESH */

                if (!delay_apply_cfg &&
                    hostapd_set_freq(hapd, hapd->iconf->hw_mode, iface->freq,
                                     hapd->iconf->channel,
                                     hapd->iconf->ieee80211n,
                                     hapd->iconf->ieee80211ac,
                                     hapd->iconf->secondary_channel,
                                     hapd->iconf->vht_oper_chwidth,
                                     hapd->iconf->vht_oper_centr_freq_seg0_idx,
                                     hapd->iconf->vht_oper_centr_freq_seg1_idx)) {
                        wpa_printf(MSG_ERROR, "Could not set channel for "
                                   "kernel driver");
                        goto fail;
                }
        }

        if (iface->current_mode) {
                if (hostapd_prepare_rates(iface, iface->current_mode)) {
                        wpa_printf(MSG_ERROR, "Failed to prepare rates "
                                   "table.");
                        hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
                                       HOSTAPD_LEVEL_WARNING,
                                       "Failed to prepare rates table.");
                        goto fail;
                }
        }

        if (hapd->iconf->rts_threshold > -1 &&
            hostapd_set_rts(hapd, hapd->iconf->rts_threshold)) {
                wpa_printf(MSG_ERROR, "Could not set RTS threshold for "
                           "kernel driver");
                goto fail;
        }

        if (hapd->iconf->fragm_threshold > -1 &&
            hostapd_set_frag(hapd, hapd->iconf->fragm_threshold)) {
                wpa_printf(MSG_ERROR, "Could not set fragmentation threshold "
                           "for kernel driver");
                goto fail;
        }

        prev_addr = hapd->own_addr;

        for (j = 0; j < iface->num_bss; j++) {
                hapd = iface->bss[j];
                if (j)
                        os_memcpy(hapd->own_addr, prev_addr, ETH_ALEN);
                if (hostapd_setup_bss(hapd, j == 0)) {
                        do {
                                hapd = iface->bss[j];
                                hostapd_bss_deinit_no_free(hapd);
                                hostapd_free_hapd_data(hapd);
                        } while (j-- > 0);
                        goto fail;
                }
                if (hostapd_mac_comp_empty(hapd->conf->bssid) == 0)
                        prev_addr = hapd->own_addr;
        }
        hapd = iface->bss[0];

        hostapd_tx_queue_params(iface);

        ap_list_init(iface);

        hostapd_set_acl(hapd);

        if (hostapd_driver_commit(hapd) < 0) {
                wpa_printf(MSG_ERROR, "%s: Failed to commit driver "
                           "configuration", __func__);
                goto fail;
        }

        /*
         * WPS UPnP module can be initialized only when the "upnp_iface" is up.
         * If "interface" and "upnp_iface" are the same (e.g., non-bridge
         * mode), the interface is up only after driver_commit, so initialize
         * WPS after driver_commit.
         */
        for (j = 0; j < iface->num_bss; j++) {
                if (hostapd_init_wps_complete(iface->bss[j]))
                        goto fail;
        }

        hostapd_set_state(iface, HAPD_IFACE_ENABLED);
        wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, AP_EVENT_ENABLED);
        if (hapd->setup_complete_cb)
                hapd->setup_complete_cb(hapd->setup_complete_cb_ctx);

        wpa_printf(MSG_DEBUG, "%s: Setup of interface done.",
                   iface->bss[0]->conf->iface);
        if (iface->interfaces && iface->interfaces->terminate_on_error > 0)
                iface->interfaces->terminate_on_error--;

        return 0;

fail:
        wpa_printf(MSG_ERROR, "Interface initialization failed");
        hostapd_set_state(iface, HAPD_IFACE_DISABLED);
        wpa_msg(hapd->msg_ctx, MSG_INFO, AP_EVENT_DISABLED);
        if (iface->interfaces && iface->interfaces->terminate_on_error)
                eloop_terminate();
        return -1;
}


/**
 * hostapd_setup_interface - Setup of an interface
 * @iface: Pointer to interface data.
 * Returns: 0 on success, -1 on failure
 *
 * Initializes the driver interface, validates the configuration,
 * and sets driver parameters based on the configuration.
 * Flushes old stations, sets the channel, encryption,
 * beacons, and WDS links based on the configuration.
 *
 * If interface setup requires more time, e.g., to perform HT co-ex scans, ACS,
 * or DFS operations, this function returns 0 before such operations have been
 * completed. The pending operations are registered into eloop and will be
 * completed from eloop callbacks. Those callbacks end up calling
 * hostapd_setup_interface_complete() once setup has been completed.
 */
int hostapd_setup_interface(struct hostapd_iface *iface)
{
        int ret;

        ret = setup_interface(iface);
        if (ret) {
                wpa_printf(MSG_ERROR, "%s: Unable to setup interface.",
                           iface->bss[0]->conf->iface);
                return -1;
        }

        return 0;
}


/**
 * hostapd_alloc_bss_data - Allocate and initialize per-BSS data
 * @hapd_iface: Pointer to interface data
 * @conf: Pointer to per-interface configuration
 * @bss: Pointer to per-BSS configuration for this BSS
 * Returns: Pointer to allocated BSS data
 *
 * This function is used to allocate per-BSS data structure. This data will be
 * freed after hostapd_cleanup() is called for it during interface
 * deinitialization.
 */
struct hostapd_data *
hostapd_alloc_bss_data(struct hostapd_iface *hapd_iface,
                       struct hostapd_config *conf,
                       struct hostapd_bss_config *bss)
{
        struct hostapd_data *hapd;

        hapd = os_zalloc(sizeof(*hapd));
        if (hapd == NULL)
                return NULL;

        hapd->new_assoc_sta_cb = hostapd_new_assoc_sta;
        hapd->iconf = conf;
        hapd->conf = bss;
        hapd->iface = hapd_iface;
        hapd->driver = hapd->iconf->driver;
        hapd->ctrl_sock = -1;

        return hapd;
}


static void hostapd_bss_deinit(struct hostapd_data *hapd)
{
        wpa_printf(MSG_DEBUG, "%s: deinit bss %s", __func__,
                   hapd->conf->iface);
        hostapd_bss_deinit_no_free(hapd);
        hostapd_cleanup(hapd);
}


void hostapd_interface_deinit(struct hostapd_iface *iface)
{
        int j;

        wpa_printf(MSG_DEBUG, "%s(%p)", __func__, iface);
        if (iface == NULL)
                return;

#ifdef CONFIG_IEEE80211N
#ifdef NEED_AP_MLME
        hostapd_stop_setup_timers(iface);
        eloop_cancel_timeout(ap_ht2040_timeout, iface, NULL);
#endif /* NEED_AP_MLME */
#endif /* CONFIG_IEEE80211N */
        eloop_cancel_timeout(channel_list_update_timeout, iface, NULL);
        iface->wait_channel_update = 0;

        for (j = iface->num_bss - 1; j >= 0; j--)
                hostapd_bss_deinit(iface->bss[j]);
}


void hostapd_interface_free(struct hostapd_iface *iface)
{
        size_t j;
        wpa_printf(MSG_DEBUG, "%s(%p)", __func__, iface);
        for (j = 0; j < iface->num_bss; j++) {
                wpa_printf(MSG_DEBUG, "%s: free hapd %p",
                           __func__, iface->bss[j]);
                os_free(iface->bss[j]);
        }
        hostapd_cleanup_iface(iface);
}


/**
 * hostapd_init - Allocate and initialize per-interface data
 * @config_file: Path to the configuration file
 * Returns: Pointer to the allocated interface data or %NULL on failure
 *
 * This function is used to allocate main data structures for per-interface
 * data. The allocated data buffer will be freed by calling
 * hostapd_cleanup_iface().
 */
struct hostapd_iface * hostapd_init(struct hapd_interfaces *interfaces,
                                    const char *config_file)
{
        struct hostapd_iface *hapd_iface = NULL;
        struct hostapd_config *conf = NULL;
        struct hostapd_data *hapd;
        size_t i;

        hapd_iface = os_zalloc(sizeof(*hapd_iface));
        if (hapd_iface == NULL)
                goto fail;

        hapd_iface->config_fname = os_strdup(config_file);
        if (hapd_iface->config_fname == NULL)
                goto fail;

        conf = interfaces->config_read_cb(hapd_iface->config_fname);
        if (conf == NULL)
                goto fail;
        hapd_iface->conf = conf;

        hapd_iface->num_bss = conf->num_bss;
        hapd_iface->bss = os_calloc(conf->num_bss,
                                    sizeof(struct hostapd_data *));
        if (hapd_iface->bss == NULL)
                goto fail;

        for (i = 0; i < conf->num_bss; i++) {
                hapd = hapd_iface->bss[i] =
                        hostapd_alloc_bss_data(hapd_iface, conf,
                                               conf->bss[i]);
                if (hapd == NULL)
                        goto fail;
                hapd->msg_ctx = hapd;
        }

        return hapd_iface;

fail:
        wpa_printf(MSG_ERROR, "Failed to set up interface with %s",
                   config_file);
        if (conf)
                hostapd_config_free(conf);
        if (hapd_iface) {
                os_free(hapd_iface->config_fname);
                os_free(hapd_iface->bss);
                wpa_printf(MSG_DEBUG, "%s: free iface %p",
                           __func__, hapd_iface);
                os_free(hapd_iface);
        }
        return NULL;
}


static int ifname_in_use(struct hapd_interfaces *interfaces, const char *ifname)
{
        size_t i, j;

        for (i = 0; i < interfaces->count; i++) {
                struct hostapd_iface *iface = interfaces->iface[i];
                for (j = 0; j < iface->num_bss; j++) {
                        struct hostapd_data *hapd = iface->bss[j];
                        if (os_strcmp(ifname, hapd->conf->iface) == 0)
                                return 1;
                }
        }

        return 0;
}


/**
 * hostapd_interface_init_bss - Read configuration file and init BSS data
 *
 * This function is used to parse configuration file for a BSS. This BSS is
 * added to an existing interface sharing the same radio (if any) or a new
 * interface is created if this is the first interface on a radio. This
 * allocate memory for the BSS. No actual driver operations are started.
 *
 * This is similar to hostapd_interface_init(), but for a case where the
 * configuration is used to add a single BSS instead of all BSSes for a radio.
 */
struct hostapd_iface *
hostapd_interface_init_bss(struct hapd_interfaces *interfaces, const char *phy,
                           const char *config_fname, int debug)
{
        struct hostapd_iface *new_iface = NULL, *iface = NULL;
        struct hostapd_data *hapd;
        int k;
        size_t i, bss_idx;

        if (!phy || !*phy)
                return NULL;

        for (i = 0; i < interfaces->count; i++) {
                if (os_strcmp(interfaces->iface[i]->phy, phy) == 0) {
                        iface = interfaces->iface[i];
                        break;
                }
        }

        wpa_printf(MSG_INFO, "Configuration file: %s (phy %s)%s",
                   config_fname, phy, iface ? "" : " --> new PHY");
        if (iface) {
                struct hostapd_config *conf;
                struct hostapd_bss_config **tmp_conf;
                struct hostapd_data **tmp_bss;
                struct hostapd_bss_config *bss;
                const char *ifname;

                /* Add new BSS to existing iface */
                conf = interfaces->config_read_cb(config_fname);
                if (conf == NULL)
                        return NULL;
                if (conf->num_bss > 1) {
                        wpa_printf(MSG_ERROR, "Multiple BSSes specified in BSS-config");
                        hostapd_config_free(conf);
                        return NULL;
                }

                ifname = conf->bss[0]->iface;
                if (ifname[0] != '\0' && ifname_in_use(interfaces, ifname)) {
                        wpa_printf(MSG_ERROR,
                                   "Interface name %s already in use", ifname);
                        hostapd_config_free(conf);
                        return NULL;
                }

                tmp_conf = os_realloc_array(
                        iface->conf->bss, iface->conf->num_bss + 1,
                        sizeof(struct hostapd_bss_config *));
                tmp_bss = os_realloc_array(iface->bss, iface->num_bss + 1,
                                           sizeof(struct hostapd_data *));
                if (tmp_bss)
                        iface->bss = tmp_bss;
                if (tmp_conf) {
                        iface->conf->bss = tmp_conf;
                        iface->conf->last_bss = tmp_conf[0];
                }
                if (tmp_bss == NULL || tmp_conf == NULL) {
                        hostapd_config_free(conf);
                        return NULL;
                }
                bss = iface->conf->bss[iface->conf->num_bss] = conf->bss[0];
                iface->conf->num_bss++;

                hapd = hostapd_alloc_bss_data(iface, iface->conf, bss);
                if (hapd == NULL) {
                        iface->conf->num_bss--;
                        hostapd_config_free(conf);
                        return NULL;
                }
                iface->conf->last_bss = bss;
                iface->bss[iface->num_bss] = hapd;
                hapd->msg_ctx = hapd;

                bss_idx = iface->num_bss++;
                conf->num_bss--;
                conf->bss[0] = NULL;
                hostapd_config_free(conf);
        } else {
                /* Add a new iface with the first BSS */
                new_iface = iface = hostapd_init(interfaces, config_fname);
                if (!iface)
                        return NULL;
                os_strlcpy(iface->phy, phy, sizeof(iface->phy));
                iface->interfaces = interfaces;
                bss_idx = 0;
        }

        for (k = 0; k < debug; k++) {
                if (iface->bss[bss_idx]->conf->logger_stdout_level > 0)
                        iface->bss[bss_idx]->conf->logger_stdout_level--;
        }

        if (iface->conf->bss[bss_idx]->iface[0] == '\0' &&
            !hostapd_drv_none(iface->bss[bss_idx])) {
                wpa_printf(MSG_ERROR, "Interface name not specified in %s",
                           config_fname);
                if (new_iface)
                        hostapd_interface_deinit_free(new_iface);
                return NULL;
        }

        return iface;
}


void hostapd_interface_deinit_free(struct hostapd_iface *iface)
{
        const struct wpa_driver_ops *driver;
        void *drv_priv;

        wpa_printf(MSG_DEBUG, "%s(%p)", __func__, iface);
        if (iface == NULL)
                return;
        wpa_printf(MSG_DEBUG, "%s: num_bss=%u conf->num_bss=%u",
                   __func__, (unsigned int) iface->num_bss,
                   (unsigned int) iface->conf->num_bss);
        driver = iface->bss[0]->driver;
        drv_priv = iface->bss[0]->drv_priv;
        hostapd_interface_deinit(iface);
        wpa_printf(MSG_DEBUG, "%s: driver=%p drv_priv=%p -> hapd_deinit",
                   __func__, driver, drv_priv);
        if (driver && driver->hapd_deinit && drv_priv) {
                driver->hapd_deinit(drv_priv);
                iface->bss[0]->drv_priv = NULL;
        }
        hostapd_interface_free(iface);
}


static void hostapd_deinit_driver(const struct wpa_driver_ops *driver,
                                  void *drv_priv,
                                  struct hostapd_iface *hapd_iface)
{
        size_t j;

        wpa_printf(MSG_DEBUG, "%s: driver=%p drv_priv=%p -> hapd_deinit",
                   __func__, driver, drv_priv);
        if (driver && driver->hapd_deinit && drv_priv) {
                driver->hapd_deinit(drv_priv);
                for (j = 0; j < hapd_iface->num_bss; j++) {
                        wpa_printf(MSG_DEBUG, "%s:bss[%d]->drv_priv=%p",
                                   __func__, (int) j,
                                   hapd_iface->bss[j]->drv_priv);
                        if (hapd_iface->bss[j]->drv_priv == drv_priv)
                                hapd_iface->bss[j]->drv_priv = NULL;
                }
        }
}


int hostapd_enable_iface(struct hostapd_iface *hapd_iface)
{
        size_t j;

        if (hapd_iface->bss[0]->drv_priv != NULL) {
                wpa_printf(MSG_ERROR, "Interface %s already enabled",
                           hapd_iface->conf->bss[0]->iface);
                return -1;
        }

        wpa_printf(MSG_DEBUG, "Enable interface %s",
                   hapd_iface->conf->bss[0]->iface);

        for (j = 0; j < hapd_iface->num_bss; j++)
                hostapd_set_security_params(hapd_iface->conf->bss[j], 1);
        if (hostapd_config_check(hapd_iface->conf, 1) < 0) {
                wpa_printf(MSG_INFO, "Invalid configuration - cannot enable");
                return -1;
        }

        if (hapd_iface->interfaces == NULL ||
            hapd_iface->interfaces->driver_init == NULL ||
            hapd_iface->interfaces->driver_init(hapd_iface))
                return -1;

        if (hostapd_setup_interface(hapd_iface)) {
                hostapd_deinit_driver(hapd_iface->bss[0]->driver,
                                      hapd_iface->bss[0]->drv_priv,
                                      hapd_iface);
                return -1;
        }

        return 0;
}


int hostapd_reload_iface(struct hostapd_iface *hapd_iface)
{
        size_t j;

        wpa_printf(MSG_DEBUG, "Reload interface %s",
                   hapd_iface->conf->bss[0]->iface);
        for (j = 0; j < hapd_iface->num_bss; j++)
                hostapd_set_security_params(hapd_iface->conf->bss[j], 1);
        if (hostapd_config_check(hapd_iface->conf, 1) < 0) {
                wpa_printf(MSG_ERROR, "Updated configuration is invalid");
                return -1;
        }
        hostapd_clear_old(hapd_iface);
        for (j = 0; j < hapd_iface->num_bss; j++)
                hostapd_reload_bss(hapd_iface->bss[j]);

        return 0;
}


int hostapd_disable_iface(struct hostapd_iface *hapd_iface)
{
        size_t j;
        const struct wpa_driver_ops *driver;
        void *drv_priv;

        if (hapd_iface == NULL)
                return -1;

        if (hapd_iface->bss[0]->drv_priv == NULL) {
                wpa_printf(MSG_INFO, "Interface %s already disabled",
                           hapd_iface->conf->bss[0]->iface);
                return -1;
        }

        wpa_msg(hapd_iface->bss[0]->msg_ctx, MSG_INFO, AP_EVENT_DISABLED);
        driver = hapd_iface->bss[0]->driver;
        drv_priv = hapd_iface->bss[0]->drv_priv;

        hapd_iface->driver_ap_teardown =
                !!(hapd_iface->drv_flags &
                   WPA_DRIVER_FLAGS_AP_TEARDOWN_SUPPORT);

        /* same as hostapd_interface_deinit without deinitializing ctrl-iface */
        for (j = 0; j < hapd_iface->num_bss; j++) {
                struct hostapd_data *hapd = hapd_iface->bss[j];
                hostapd_bss_deinit_no_free(hapd);
                hostapd_free_hapd_data(hapd);
        }

        hostapd_deinit_driver(driver, drv_priv, hapd_iface);

        /* From hostapd_cleanup_iface: These were initialized in
         * hostapd_setup_interface and hostapd_setup_interface_complete
         */
        hostapd_cleanup_iface_partial(hapd_iface);

        wpa_printf(MSG_DEBUG, "Interface %s disabled",
                   hapd_iface->bss[0]->conf->iface);
        hostapd_set_state(hapd_iface, HAPD_IFACE_DISABLED);
        return 0;
}


static struct hostapd_iface *
hostapd_iface_alloc(struct hapd_interfaces *interfaces)
{
        struct hostapd_iface **iface, *hapd_iface;

        iface = os_realloc_array(interfaces->iface, interfaces->count + 1,
                                 sizeof(struct hostapd_iface *));
        if (iface == NULL)
                return NULL;
        interfaces->iface = iface;
        hapd_iface = interfaces->iface[interfaces->count] =
                os_zalloc(sizeof(*hapd_iface));
        if (hapd_iface == NULL) {
                wpa_printf(MSG_ERROR, "%s: Failed to allocate memory for "
                           "the interface", __func__);
                return NULL;
        }
        interfaces->count++;
        hapd_iface->interfaces = interfaces;

        return hapd_iface;
}


static struct hostapd_config *
hostapd_config_alloc(struct hapd_interfaces *interfaces, const char *ifname,
                     const char *ctrl_iface)
{
        struct hostapd_bss_config *bss;
        struct hostapd_config *conf;

        /* Allocates memory for bss and conf */
        conf = hostapd_config_defaults();
        if (conf == NULL) {
                 wpa_printf(MSG_ERROR, "%s: Failed to allocate memory for "
                                "configuration", __func__);
                return NULL;
        }

        conf->driver = wpa_drivers[0];
        if (conf->driver == NULL) {
                wpa_printf(MSG_ERROR, "No driver wrappers registered!");
                hostapd_config_free(conf);
                return NULL;
        }

        bss = conf->last_bss = conf->bss[0];

        os_strlcpy(bss->iface, ifname, sizeof(bss->iface));
        bss->ctrl_interface = os_strdup(ctrl_iface);
        if (bss->ctrl_interface == NULL) {
                hostapd_config_free(conf);
                return NULL;
        }

        /* Reading configuration file skipped, will be done in SET!
         * From reading the configuration till the end has to be done in
         * SET
         */
        return conf;
}


static struct hostapd_iface * hostapd_data_alloc(
        struct hapd_interfaces *interfaces, struct hostapd_config *conf)
{
        size_t i;
        struct hostapd_iface *hapd_iface =
                interfaces->iface[interfaces->count - 1];
        struct hostapd_data *hapd;

        hapd_iface->conf = conf;
        hapd_iface->num_bss = conf->num_bss;

        hapd_iface->bss = os_calloc(conf->num_bss,
                                    sizeof(struct hostapd_data *));
        if (hapd_iface->bss == NULL)
                return NULL;

        for (i = 0; i < conf->num_bss; i++) {
                hapd = hapd_iface->bss[i] =
                        hostapd_alloc_bss_data(hapd_iface, conf, conf->bss[i]);
                if (hapd == NULL)
                        return NULL;
                hapd->msg_ctx = hapd;
        }

        hapd_iface->interfaces = interfaces;

        return hapd_iface;
}


int hostapd_add_iface(struct hapd_interfaces *interfaces, char *buf)
{
        struct hostapd_config *conf = NULL;
        struct hostapd_iface *hapd_iface = NULL, *new_iface = NULL;
        struct hostapd_data *hapd;
        char *ptr;
        size_t i, j;
        const char *conf_file = NULL, *phy_name = NULL;

        if (os_strncmp(buf, "bss_config=", 11) == 0) {
                char *pos;
                phy_name = buf + 11;
                pos = os_strchr(phy_name, ':');
                if (!pos)
                        return -1;
                *pos++ = '\0';
                conf_file = pos;
                if (!os_strlen(conf_file))
                        return -1;

                hapd_iface = hostapd_interface_init_bss(interfaces, phy_name,
                                                        conf_file, 0);
                if (!hapd_iface)
                        return -1;
                for (j = 0; j < interfaces->count; j++) {
                        if (interfaces->iface[j] == hapd_iface)
                                break;
                }
                if (j == interfaces->count) {
                        struct hostapd_iface **tmp;
                        tmp = os_realloc_array(interfaces->iface,
                                               interfaces->count + 1,
                                               sizeof(struct hostapd_iface *));
                        if (!tmp) {
                                hostapd_interface_deinit_free(hapd_iface);
                                return -1;
                        }
                        interfaces->iface = tmp;
                        interfaces->iface[interfaces->count++] = hapd_iface;
                        new_iface = hapd_iface;
                }

                if (new_iface) {
                        if (interfaces->driver_init(hapd_iface)) {
                                interfaces->count--;
                                goto fail;
                        }

                        if (hostapd_setup_interface(hapd_iface)) {
                                interfaces->count--;
                                hostapd_deinit_driver(
                                        hapd_iface->bss[0]->driver,
                                        hapd_iface->bss[0]->drv_priv,
                                        hapd_iface);
                                goto fail;
                        }
                } else {
                        /* Assign new BSS with bss[0]'s driver info */
                        hapd = hapd_iface->bss[hapd_iface->num_bss - 1];
                        hapd->driver = hapd_iface->bss[0]->driver;
                        hapd->drv_priv = hapd_iface->bss[0]->drv_priv;
                        os_memcpy(hapd->own_addr, hapd_iface->bss[0]->own_addr,
                                  ETH_ALEN);

                        if (start_ctrl_iface_bss(hapd) < 0 ||
                            (hapd_iface->state == HAPD_IFACE_ENABLED &&
                             hostapd_setup_bss(hapd, -1))) {
                                hostapd_cleanup(hapd);
                                hapd_iface->bss[hapd_iface->num_bss - 1] = NULL;
                                hapd_iface->conf->num_bss--;
                                hapd_iface->num_bss--;
                                wpa_printf(MSG_DEBUG, "%s: free hapd %p %s",
                                           __func__, hapd, hapd->conf->iface);
                                os_free(hapd);
                                return -1;
                        }
                }
                return 0;
        }

        ptr = os_strchr(buf, ' ');
        if (ptr == NULL)
                return -1;
        *ptr++ = '\0';

        if (os_strncmp(ptr, "config=", 7) == 0)
                conf_file = ptr + 7;

        for (i = 0; i < interfaces->count; i++) {
                if (!os_strcmp(interfaces->iface[i]->conf->bss[0]->iface,
                               buf)) {
                        wpa_printf(MSG_INFO, "Cannot add interface - it "
                                   "already exists");
                        return -1;
                }
        }

        hapd_iface = hostapd_iface_alloc(interfaces);
        if (hapd_iface == NULL) {
                wpa_printf(MSG_ERROR, "%s: Failed to allocate memory "
                           "for interface", __func__);
                goto fail;
        }

        if (conf_file && interfaces->config_read_cb) {
                conf = interfaces->config_read_cb(conf_file);
                if (conf && conf->bss)
                        os_strlcpy(conf->bss[0]->iface, buf,
                                   sizeof(conf->bss[0]->iface));
        } else
                conf = hostapd_config_alloc(interfaces, buf, ptr);
        if (conf == NULL || conf->bss == NULL) {
                wpa_printf(MSG_ERROR, "%s: Failed to allocate memory "
                           "for configuration", __func__);
                goto fail;
        }

        hapd_iface = hostapd_data_alloc(interfaces, conf);
        if (hapd_iface == NULL) {
                wpa_printf(MSG_ERROR, "%s: Failed to allocate memory "
                           "for hostapd", __func__);
                goto fail;
        }

        if (start_ctrl_iface(hapd_iface) < 0)
                goto fail;

        wpa_printf(MSG_INFO, "Add interface '%s'", conf->bss[0]->iface);

        return 0;

fail:
        if (conf)
                hostapd_config_free(conf);
        if (hapd_iface) {
                if (hapd_iface->bss) {
                        for (i = 0; i < hapd_iface->num_bss; i++) {
                                hapd = hapd_iface->bss[i];
                                if (!hapd)
                                        continue;
                                if (hapd_iface->interfaces &&
                                    hapd_iface->interfaces->ctrl_iface_deinit)
                                        hapd_iface->interfaces->
                                                ctrl_iface_deinit(hapd);
                                wpa_printf(MSG_DEBUG, "%s: free hapd %p (%s)",
                                           __func__, hapd_iface->bss[i],
                                           hapd->conf->iface);
                                hostapd_cleanup(hapd);
                                os_free(hapd);
                                hapd_iface->bss[i] = NULL;
                        }
                        os_free(hapd_iface->bss);
                        hapd_iface->bss = NULL;
                }
                hostapd_cleanup_iface(hapd_iface);
        }
        return -1;
}


static int hostapd_remove_bss(struct hostapd_iface *iface, unsigned int idx)
{
        size_t i;

        wpa_printf(MSG_INFO, "Remove BSS '%s'", iface->conf->bss[idx]->iface);

        /* Remove hostapd_data only if it has already been initialized */
        if (idx < iface->num_bss) {
                struct hostapd_data *hapd = iface->bss[idx];

                hostapd_bss_deinit(hapd);
                wpa_printf(MSG_DEBUG, "%s: free hapd %p (%s)",
                           __func__, hapd, hapd->conf->iface);
                hostapd_config_free_bss(hapd->conf);
                os_free(hapd);

                iface->num_bss--;

                for (i = idx; i < iface->num_bss; i++)
                        iface->bss[i] = iface->bss[i + 1];
        } else {
                hostapd_config_free_bss(iface->conf->bss[idx]);
                iface->conf->bss[idx] = NULL;
        }

        iface->conf->num_bss--;
        for (i = idx; i < iface->conf->num_bss; i++)
                iface->conf->bss[i] = iface->conf->bss[i + 1];

        return 0;
}


int hostapd_remove_iface(struct hapd_interfaces *interfaces, char *buf)
{
        struct hostapd_iface *hapd_iface;
        size_t i, j, k = 0;

        for (i = 0; i < interfaces->count; i++) {
                hapd_iface = interfaces->iface[i];
                if (hapd_iface == NULL)
                        return -1;
                if (!os_strcmp(hapd_iface->conf->bss[0]->iface, buf)) {
                        wpa_printf(MSG_INFO, "Remove interface '%s'", buf);
                        hapd_iface->driver_ap_teardown =
                                !!(hapd_iface->drv_flags &
                                   WPA_DRIVER_FLAGS_AP_TEARDOWN_SUPPORT);

                        hostapd_interface_deinit_free(hapd_iface);
                        k = i;
                        while (k < (interfaces->count - 1)) {
                                interfaces->iface[k] =
                                        interfaces->iface[k + 1];
                                k++;
                        }
                        interfaces->count--;
                        return 0;
                }

                for (j = 0; j < hapd_iface->conf->num_bss; j++) {
                        if (!os_strcmp(hapd_iface->conf->bss[j]->iface, buf)) {
                                hapd_iface->driver_ap_teardown =
                                        !(hapd_iface->drv_flags &
                                          WPA_DRIVER_FLAGS_AP_TEARDOWN_SUPPORT);
                                return hostapd_remove_bss(hapd_iface, j);
                        }
                }
        }
        return -1;
}


/**
 * hostapd_new_assoc_sta - Notify that a new station associated with the AP
 * @hapd: Pointer to BSS data
 * @sta: Pointer to the associated STA data
 * @reassoc: 1 to indicate this was a re-association; 0 = first association
 *
 * This function will be called whenever a station associates with the AP. It
 * can be called from ieee802_11.c for drivers that export MLME to hostapd and
 * from drv_callbacks.c based on driver events for drivers that take care of
 * management frames (IEEE 802.11 authentication and association) internally.
 */
void hostapd_new_assoc_sta(struct hostapd_data *hapd, struct sta_info *sta,
                           int reassoc)
{
        if (hapd->tkip_countermeasures) {
                hostapd_drv_sta_deauth(hapd, sta->addr,
                                       WLAN_REASON_MICHAEL_MIC_FAILURE);
                return;
        }

        hostapd_prune_associations(hapd, sta->addr);

        /* IEEE 802.11F (IAPP) */
        if (hapd->conf->ieee802_11f)
                iapp_new_station(hapd->iapp, sta);

#ifdef CONFIG_P2P
        if (sta->p2p_ie == NULL && !sta->no_p2p_set) {
                sta->no_p2p_set = 1;
                hapd->num_sta_no_p2p++;
                if (hapd->num_sta_no_p2p == 1)
                        hostapd_p2p_non_p2p_sta_connected(hapd);
        }
#endif /* CONFIG_P2P */

        /* Start accounting here, if IEEE 802.1X and WPA are not used.
         * IEEE 802.1X/WPA code will start accounting after the station has
         * been authorized. */
        if (!hapd->conf->ieee802_1x && !hapd->conf->wpa && !hapd->conf->osen) {
                ap_sta_set_authorized(hapd, sta, 1);
                os_get_reltime(&sta->connected_time);
                accounting_sta_start(hapd, sta);
        }

        /* Start IEEE 802.1X authentication process for new stations */
        ieee802_1x_new_station(hapd, sta);
        if (reassoc) {
                if (sta->auth_alg != WLAN_AUTH_FT &&
                    !(sta->flags & (WLAN_STA_WPS | WLAN_STA_MAYBE_WPS)))
                        wpa_auth_sm_event(sta->wpa_sm, WPA_REAUTH);
        } else
                wpa_auth_sta_associated(hapd->wpa_auth, sta->wpa_sm);

        if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_INACTIVITY_TIMER)) {
                wpa_printf(MSG_DEBUG, "%s: reschedule ap_handle_timer timeout "
                           "for " MACSTR " (%d seconds - ap_max_inactivity)",
                           __func__, MAC2STR(sta->addr),
                           hapd->conf->ap_max_inactivity);
                eloop_cancel_timeout(ap_handle_timer, hapd, sta);
                eloop_register_timeout(hapd->conf->ap_max_inactivity, 0,
                                       ap_handle_timer, hapd, sta);
        }
}


const char * hostapd_state_text(enum hostapd_iface_state s)
{
        switch (s) {
        case HAPD_IFACE_UNINITIALIZED:
                return "UNINITIALIZED";
        case HAPD_IFACE_DISABLED:
                return "DISABLED";
        case HAPD_IFACE_COUNTRY_UPDATE:
                return "COUNTRY_UPDATE";
        case HAPD_IFACE_ACS:
                return "ACS";
        case HAPD_IFACE_HT_SCAN:
                return "HT_SCAN";
        case HAPD_IFACE_DFS:
                return "DFS";
        case HAPD_IFACE_ENABLED:
                return "ENABLED";
        }

        return "UNKNOWN";
}


void hostapd_set_state(struct hostapd_iface *iface, enum hostapd_iface_state s)
{
        wpa_printf(MSG_INFO, "%s: interface state %s->%s",
                   iface->conf->bss[0]->iface, hostapd_state_text(iface->state),
                   hostapd_state_text(s));
        iface->state = s;
}


#ifdef NEED_AP_MLME

static void free_beacon_data(struct beacon_data *beacon)
{
        os_free(beacon->head);
        beacon->head = NULL;
        os_free(beacon->tail);
        beacon->tail = NULL;
        os_free(beacon->probe_resp);
        beacon->probe_resp = NULL;
        os_free(beacon->beacon_ies);
        beacon->beacon_ies = NULL;
        os_free(beacon->proberesp_ies);
        beacon->proberesp_ies = NULL;
        os_free(beacon->assocresp_ies);
        beacon->assocresp_ies = NULL;
}


static int hostapd_build_beacon_data(struct hostapd_data *hapd,
                                     struct beacon_data *beacon)
{
        struct wpabuf *beacon_extra, *proberesp_extra, *assocresp_extra;
        struct wpa_driver_ap_params params;
        int ret;

        os_memset(beacon, 0, sizeof(*beacon));
        ret = ieee802_11_build_ap_params(hapd, &params);
        if (ret < 0)
                return ret;

        ret = hostapd_build_ap_extra_ies(hapd, &beacon_extra,
                                         &proberesp_extra,
                                         &assocresp_extra);
        if (ret)
                goto free_ap_params;

        ret = -1;
        beacon->head = os_malloc(params.head_len);
        if (!beacon->head)
                goto free_ap_extra_ies;

        os_memcpy(beacon->head, params.head, params.head_len);
        beacon->head_len = params.head_len;

        beacon->tail = os_malloc(params.tail_len);
        if (!beacon->tail)
                goto free_beacon;

        os_memcpy(beacon->tail, params.tail, params.tail_len);
        beacon->tail_len = params.tail_len;

        if (params.proberesp != NULL) {
                beacon->probe_resp = os_malloc(params.proberesp_len);
                if (!beacon->probe_resp)
                        goto free_beacon;

                os_memcpy(beacon->probe_resp, params.proberesp,
                          params.proberesp_len);
                beacon->probe_resp_len = params.proberesp_len;
        }

        /* copy the extra ies */
        if (beacon_extra) {
                beacon->beacon_ies = os_malloc(wpabuf_len(beacon_extra));
                if (!beacon->beacon_ies)
                        goto free_beacon;

                os_memcpy(beacon->beacon_ies,
                          beacon_extra->buf, wpabuf_len(beacon_extra));
                beacon->beacon_ies_len = wpabuf_len(beacon_extra);
        }

        if (proberesp_extra) {
                beacon->proberesp_ies =
                        os_malloc(wpabuf_len(proberesp_extra));
                if (!beacon->proberesp_ies)
                        goto free_beacon;

                os_memcpy(beacon->proberesp_ies, proberesp_extra->buf,
                          wpabuf_len(proberesp_extra));
                beacon->proberesp_ies_len = wpabuf_len(proberesp_extra);
        }

        if (assocresp_extra) {
                beacon->assocresp_ies =
                        os_malloc(wpabuf_len(assocresp_extra));
                if (!beacon->assocresp_ies)
                        goto free_beacon;

                os_memcpy(beacon->assocresp_ies, assocresp_extra->buf,
                          wpabuf_len(assocresp_extra));
                beacon->assocresp_ies_len = wpabuf_len(assocresp_extra);
        }

        ret = 0;
free_beacon:
        /* if the function fails, the caller should not free beacon data */
        if (ret)
                free_beacon_data(beacon);

free_ap_extra_ies:
        hostapd_free_ap_extra_ies(hapd, beacon_extra, proberesp_extra,
                                  assocresp_extra);
free_ap_params:
        ieee802_11_free_ap_params(&params);
        return ret;
}


/*
 * TODO: This flow currently supports only changing frequency within the
 * same hw_mode. Any other changes to MAC parameters or provided settings (even
 * width) are not supported.
 */
static int hostapd_change_config_freq(struct hostapd_data *hapd,
                                      struct hostapd_config *conf,
                                      struct hostapd_freq_params *params,
                                      struct hostapd_freq_params *old_params)
{
        int channel;

        if (!params->channel) {
                /* check if the new channel is supported by hw */
                params->channel = hostapd_hw_get_channel(hapd, params->freq);
        }

        channel = params->channel;
        if (!channel)
                return -1;

        /* if a pointer to old_params is provided we save previous state */
        if (old_params) {
                old_params->channel = conf->channel;
                old_params->ht_enabled = conf->ieee80211n;
                old_params->sec_channel_offset = conf->secondary_channel;
        }

        conf->channel = channel;
        conf->ieee80211n = params->ht_enabled;
        conf->secondary_channel = params->sec_channel_offset;

        /* TODO: maybe call here hostapd_config_check here? */

        return 0;
}


static int hostapd_fill_csa_settings(struct hostapd_data *hapd,
                                     struct csa_settings *settings)
{
        struct hostapd_iface *iface = hapd->iface;
        struct hostapd_freq_params old_freq;
        int ret;

        os_memset(&old_freq, 0, sizeof(old_freq));
        if (!iface || !iface->freq || hapd->csa_in_progress)
                return -1;

        ret = hostapd_change_config_freq(iface->bss[0], iface->conf,
                                         &settings->freq_params,
                                         &old_freq);
        if (ret)
                return ret;

        ret = hostapd_build_beacon_data(hapd, &settings->beacon_after);

        /* change back the configuration */
        hostapd_change_config_freq(iface->bss[0], iface->conf,
                                   &old_freq, NULL);

        if (ret)
                return ret;

        /* set channel switch parameters for csa ie */
        hapd->cs_freq_params = settings->freq_params;
        hapd->cs_count = settings->cs_count;
        hapd->cs_block_tx = settings->block_tx;

        ret = hostapd_build_beacon_data(hapd, &settings->beacon_csa);
        if (ret) {
                free_beacon_data(&settings->beacon_after);
                return ret;
        }

        settings->counter_offset_beacon = hapd->cs_c_off_beacon;
        settings->counter_offset_presp = hapd->cs_c_off_proberesp;

        return 0;
}


void hostapd_cleanup_cs_params(struct hostapd_data *hapd)
{
        os_memset(&hapd->cs_freq_params, 0, sizeof(hapd->cs_freq_params));
        hapd->cs_count = 0;
        hapd->cs_block_tx = 0;
        hapd->cs_c_off_beacon = 0;
        hapd->cs_c_off_proberesp = 0;
        hapd->csa_in_progress = 0;
}


int hostapd_switch_channel(struct hostapd_data *hapd,
                           struct csa_settings *settings)
{
        int ret;

        if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_AP_CSA)) {
                wpa_printf(MSG_INFO, "CSA is not supported");
                return -1;
        }

        ret = hostapd_fill_csa_settings(hapd, settings);
        if (ret)
                return ret;

        ret = hostapd_drv_switch_channel(hapd, settings);
        free_beacon_data(&settings->beacon_csa);
        free_beacon_data(&settings->beacon_after);

        if (ret) {
                /* if we failed, clean cs parameters */
                hostapd_cleanup_cs_params(hapd);
                return ret;
        }

        hapd->csa_in_progress = 1;
        return 0;
}


void
hostapd_switch_channel_fallback(struct hostapd_iface *iface,
                                const struct hostapd_freq_params *freq_params)
{
        int vht_seg0_idx = 0, vht_seg1_idx = 0, vht_bw = VHT_CHANWIDTH_USE_HT;
        unsigned int i;

        wpa_printf(MSG_DEBUG, "Restarting all CSA-related BSSes");

        if (freq_params->center_freq1)
                vht_seg0_idx = 36 + (freq_params->center_freq1 - 5180) / 5;
        if (freq_params->center_freq2)
                vht_seg1_idx = 36 + (freq_params->center_freq2 - 5180) / 5;

        switch (freq_params->bandwidth) {
        case 0:
        case 20:
        case 40:
                vht_bw = VHT_CHANWIDTH_USE_HT;
                break;
        case 80:
                if (freq_params->center_freq2)
                        vht_bw = VHT_CHANWIDTH_80P80MHZ;
                else
                        vht_bw = VHT_CHANWIDTH_80MHZ;
                break;
        case 160:
                vht_bw = VHT_CHANWIDTH_160MHZ;
                break;
        default:
                wpa_printf(MSG_WARNING, "Unknown CSA bandwidth: %d",
                           freq_params->bandwidth);
                break;
        }

        iface->freq = freq_params->freq;
        iface->conf->channel = freq_params->channel;
        iface->conf->secondary_channel = freq_params->sec_channel_offset;
        iface->conf->vht_oper_centr_freq_seg0_idx = vht_seg0_idx;
        iface->conf->vht_oper_centr_freq_seg1_idx = vht_seg1_idx;
        iface->conf->vht_oper_chwidth = vht_bw;
        iface->conf->ieee80211n = freq_params->ht_enabled;
        iface->conf->ieee80211ac = freq_params->vht_enabled;

        /*
         * cs_params must not be cleared earlier because the freq_params
         * argument may actually point to one of these.
         */
        for (i = 0; i < iface->num_bss; i++)
                hostapd_cleanup_cs_params(iface->bss[i]);

        hostapd_disable_iface(iface);
        hostapd_enable_iface(iface);
}

#endif /* NEED_AP_MLME */