source: mainline/uspace/lib/ieee80211/src/ieee80211_iface_impl.c@ d7dadcb4

/*
 * Copyright (c) 2015 Jan Kolarik
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <str.h>
#include <errno.h>

#include <ieee80211_private.h>
#include <ieee80211_iface_impl.h>

/** @addtogroup libieee80211
 * @{
 */

/** @file ieee80211_iface_impl.c
 * 
 * IEEE 802.11 default interface functions implementation.
 */

/**
 * Implementation of fetching scan results.
 * 
 * @param fun Device function.
 * @param results Structure where should be stored scan results.
 * 
 * @return EOK. 
 */
int ieee80211_get_scan_results_impl(ddf_fun_t *fun, 
        ieee80211_scan_results_t *results, bool now)
{
        nic_t *nic_data = nic_get_from_ddf_fun(fun);
        ieee80211_dev_t *ieee80211_dev = nic_get_specific(nic_data);
        
        if(!ieee80211_is_ready(ieee80211_dev))
                return EREFUSED;
        
        fibril_mutex_lock(&ieee80211_dev->ap_list.scan_mutex);
        time_t scan_span = time(NULL) - ieee80211_dev->ap_list.last_scan;
        fibril_mutex_unlock(&ieee80211_dev->ap_list.scan_mutex);
        
        if(now || scan_span > MAX_SCAN_SPAN_SEC) {
                ieee80211_dev->ops->scan(ieee80211_dev);
        }
        
        fibril_mutex_lock(&ieee80211_dev->ap_list.scan_mutex);
        if(results) {
                ieee80211_scan_result_list_t *result_list =
                        &ieee80211_dev->ap_list;
                
                int i = 0;
                ieee80211_scan_result_list_foreach(*result_list, result) {
                        memcpy(&results->results[i], 
                                &result->scan_result, 
                                sizeof(ieee80211_scan_result_t));
                        i++;
                }
                
                results->length = i;
        }
        fibril_mutex_unlock(&ieee80211_dev->ap_list.scan_mutex);
        
        return EOK;
}

static uint16_t ieee80211_channel_to_freq(uint8_t channel)
{
        return IEEE80211_CHANNEL_GAP * (channel - 1) + IEEE80211_FIRST_FREQ;
}

/**
 * Working procedure of connect function.
 * 
 * @param ieee80211_dev Pointer to IEEE 802.11 device.
 * @param auth_data Selected AP data we want to connect to.
 * 
 * @return EOK if everything OK, ETIMEOUT when timeout during authenticating.
 */
static int ieee80211_connect_proc(ieee80211_dev_t *ieee80211_dev,
        ieee80211_scan_result_link_t *auth_data, char *password)
{
        int rc;
        
        ieee80211_dev->bssid_info.res_link = auth_data;
        
        /* Set channel. */
        rc = ieee80211_dev->ops->set_freq(ieee80211_dev, 
                ieee80211_channel_to_freq(auth_data->scan_result.channel));
        if(rc != EOK)
                return rc;
        
        /* Try to authenticate. */
        ieee80211_authenticate(ieee80211_dev);
        fibril_mutex_lock(&ieee80211_dev->gen_mutex);
        rc = fibril_condvar_wait_timeout(&ieee80211_dev->gen_cond,
                        &ieee80211_dev->gen_mutex,
                        AUTH_TIMEOUT);
        fibril_mutex_unlock(&ieee80211_dev->gen_mutex);
        if(rc != EOK)
                return rc;
        if(ieee80211_dev->current_auth_phase != IEEE80211_AUTH_AUTHENTICATED)
                return EINVAL;
        
        /* Try to associate. */
        ieee80211_associate(ieee80211_dev, password);
        fibril_mutex_lock(&ieee80211_dev->gen_mutex);
        rc = fibril_condvar_wait_timeout(&ieee80211_dev->gen_cond,
                        &ieee80211_dev->gen_mutex,
                        AUTH_TIMEOUT);
        fibril_mutex_unlock(&ieee80211_dev->gen_mutex);
        if(rc != EOK)
                return rc;
        if(ieee80211_dev->current_auth_phase != IEEE80211_AUTH_ASSOCIATED)
                return EINVAL;
        
        /* On open network, we are finished. */
        if(auth_data->scan_result.security.type == IEEE80211_SECURITY_OPEN)
                return EOK;
        
        /* Otherwise wait for 4-way handshake to complete. */
        fibril_mutex_lock(&ieee80211_dev->gen_mutex);
        rc = fibril_condvar_wait_timeout(&ieee80211_dev->gen_cond,
                        &ieee80211_dev->gen_mutex,
                        HANDSHAKE_TIMEOUT);
        fibril_mutex_unlock(&ieee80211_dev->gen_mutex);
        if(rc != EOK)
                return rc;
        if(ieee80211_dev->current_auth_phase != IEEE80211_AUTH_ASSOCIATED)
                return EINVAL;
        
        return EOK;
}

/**
 * Implementation of connecting to specified SSID.
 * 
 * @param fun Device function.
 * @param ssid_start SSID prefix of access point we want to connect to.
 * 
 * @return EOK if everything OK, ETIMEOUT when timeout during authenticating,
 * EINVAL when SSID not in scan results list, EPERM when incorrect password
 * passed.
 */
int ieee80211_connect_impl(ddf_fun_t *fun, char *ssid_start, char *password)
{
        assert(ssid_start);
        assert(password);
        
        nic_t *nic_data = nic_get_from_ddf_fun(fun);
        ieee80211_dev_t *ieee80211_dev = nic_get_specific(nic_data);
        
        if(!ieee80211_is_ready(ieee80211_dev))
                return EREFUSED;
        
        if(ieee80211_is_connected(ieee80211_dev)) {
                int rc = ieee80211_dev->iface->disconnect(fun);
                if(rc != EOK)
                        return rc;
        }
        
        fibril_mutex_lock(&ieee80211_dev->ap_list.scan_mutex);

        ieee80211_scan_result_list_foreach(ieee80211_dev->ap_list, result) {
                if(!str_lcmp(ssid_start, 
                        result->scan_result.ssid, 
                        str_size(ssid_start))) {
                        fibril_mutex_unlock(&ieee80211_dev->ap_list.scan_mutex);
                        return ieee80211_connect_proc(ieee80211_dev, result,
                                password);
                }
        }
        
        fibril_mutex_unlock(&ieee80211_dev->ap_list.scan_mutex);
        
        return EINVAL;
}

/**
 * Implementation of disconnecting device from network.
 * 
 * @param fun Device function.
 * 
 * @return EOK if everything OK, EINVAL when not connected to any network.
 */
int ieee80211_disconnect_impl(ddf_fun_t *fun)
{
        nic_t *nic_data = nic_get_from_ddf_fun(fun);
        ieee80211_dev_t *ieee80211_dev = nic_get_specific(nic_data);
        
        if(!ieee80211_is_ready(ieee80211_dev))
                return EREFUSED;
        
        if(!ieee80211_is_connected(ieee80211_dev)) {
                return EINVAL;
        } else {
                return ieee80211_deauthenticate(ieee80211_dev);
        }
}

/** @}
 */