source: mainline/uspace/lib/net/netif/netif_local.c@ fb9ffb0

/*
 * Copyright (c) 2009 Lukas Mejdrech
 * 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.
 */

/** @addtogroup libnet 
 * @{
 */

/** @file
 * Network interface module skeleton implementation.
 * @see netif.h
 */

#include <async.h>
#include <mem.h>
#include <fibril_synch.h>
#include <stdio.h>
#include <ipc/ipc.h>
#include <ipc/services.h>
#include <ipc/netif.h>
#include <err.h>

#include <generic.h>
#include <net/modules.h>
#include <net/packet.h>
#include <packet_client.h>
#include <packet_remote.h>
#include <adt/measured_strings.h>
#include <net/device.h>
#include <nil_interface.h>
#include <netif_local.h>
#include <netif_interface.h>

DEVICE_MAP_IMPLEMENT(netif_device_map, netif_device_t);

/** Network interface global data. */
netif_globals_t netif_globals;

/** Probe the existence of the device.
 *
 * @param[in] netif_phone The network interface phone.
 * @param[in] device_id The device identifier.
 * @param[in] irq       The device interrupt number.
 * @param[in] io        The device input/output address.
 * @return              EOK on success.
 * @return              Other error codes as defined for the
 *                      netif_probe_message().
 */
int
netif_probe_req_local(int netif_phone, device_id_t device_id, int irq, int io)
{
        fibril_rwlock_write_lock(&netif_globals.lock);
        int result = netif_probe_message(device_id, irq, io);
        fibril_rwlock_write_unlock(&netif_globals.lock);
        
        return result;
}

/** Send the packet queue.
 *
 * @param[in] netif_phone The network interface phone.
 * @param[in] device_id The device identifier.
 * @param[in] packet    The packet queue.
 * @param[in] sender    The sending module service.
 * @return              EOK on success.
 * @return              Other error codes as defined for the generic_send_msg()
 *                      function.
 */
int netif_send_msg_local(int netif_phone, device_id_t device_id,
    packet_t packet, services_t sender)
{
        fibril_rwlock_write_lock(&netif_globals.lock);
        int result = netif_send_message(device_id, packet, sender);
        fibril_rwlock_write_unlock(&netif_globals.lock);
        
        return result;
}

/** Start the device.
 *
 * @param[in] netif_phone The network interface phone.
 * @param[in] device_id The device identifier.
 * @return              EOK on success.
 * @return              Other error codes as defined for the find_device()
 *                      function.
 * @return              Other error codes as defined for the
 *                      netif_start_message() function.
 */
int netif_start_req_local(int netif_phone, device_id_t device_id)
{
        ERROR_DECLARE;
        
        fibril_rwlock_write_lock(&netif_globals.lock);
        
        netif_device_t *device;
        if (ERROR_OCCURRED(find_device(device_id, &device))) {
                fibril_rwlock_write_unlock(&netif_globals.lock);
                return ERROR_CODE;
        }
        
        int result = netif_start_message(device);
        if (result > NETIF_NULL) {
                int phone = device->nil_phone;
                fibril_rwlock_write_unlock(&netif_globals.lock);
                nil_device_state_msg(phone, device_id, result);
                return EOK;
        }
        
        fibril_rwlock_write_unlock(&netif_globals.lock);
        
        return result;
}

/** Stop the device.
 *
 * @param[in] netif_phone The network interface phone.
 * @param[in] device_id The device identifier.
 * @return              EOK on success.
 * @return              Other error codes as defined for the find_device()
 *                      function.
 * @return              Other error codes as defined for the
 *                      netif_stop_message() function.
 */
int netif_stop_req_local(int netif_phone, device_id_t device_id)
{
        ERROR_DECLARE;
        
        fibril_rwlock_write_lock(&netif_globals.lock);
        
        netif_device_t *device;
        if (ERROR_OCCURRED(find_device(device_id, &device))) {
                fibril_rwlock_write_unlock(&netif_globals.lock);
                return ERROR_CODE;
        }
        
        int result = netif_stop_message(device);
        if (result > NETIF_NULL) {
                int phone = device->nil_phone;
                fibril_rwlock_write_unlock(&netif_globals.lock);
                nil_device_state_msg(phone, device_id, result);
                return EOK;
        }
        
        fibril_rwlock_write_unlock(&netif_globals.lock);
        
        return result;
}

/** Return the device usage statistics.
 *
 * @param[in] netif_phone The network interface phone.
 * @param[in] device_id The device identifier.
 * @param[out] stats    The device usage statistics.
 * @return EOK on success.
 */
int netif_stats_req_local(int netif_phone, device_id_t device_id,
    device_stats_ref stats)
{
        fibril_rwlock_read_lock(&netif_globals.lock);
        int res = netif_get_device_stats(device_id, stats);
        fibril_rwlock_read_unlock(&netif_globals.lock);
        
        return res;
}

/** Return the device local hardware address.
 *
 * @param[in] netif_phone The network interface phone.
 * @param[in] device_id The device identifier.
 * @param[out] address  The device local hardware address.
 * @param[out] data     The address data.
 * @return              EOK on success.
 * @return              EBADMEM if the address parameter is NULL.
 * @return              ENOENT if there no such device.
 * @return              Other error codes as defined for the
 *                      netif_get_addr_message() function.
 */
int netif_get_addr_req_local(int netif_phone, device_id_t device_id,
    measured_string_ref *address, char **data)
{
        ERROR_DECLARE;
        
        if (!address || !data)
                return EBADMEM;
        
        fibril_rwlock_read_lock(&netif_globals.lock);
        
        measured_string_t translation;
        if (!ERROR_OCCURRED(netif_get_addr_message(device_id, &translation))) {
                *address = measured_string_copy(&translation);
                ERROR_CODE = (*address) ? EOK : ENOMEM;
        }
        
        fibril_rwlock_read_unlock(&netif_globals.lock);
        
        *data = (**address).value;
        
        return ERROR_CODE;
}

/** Find the device specific data.
 *
 * @param[in] device_id The device identifier.
 * @param[out] device   The device specific data.
 * @return              EOK on success.
 * @return              ENOENT if device is not found.
 * @return              EPERM if the device is not initialized.
 */
int find_device(device_id_t device_id, netif_device_t **device)
{
        if (!device)
                return EBADMEM;
        
        *device = netif_device_map_find(&netif_globals.device_map, device_id);
        if (*device == NULL)
                return ENOENT;
        
        if ((*device)->state == NETIF_NULL)
                return EPERM;
        
        return EOK;
}

/** Clear the usage statistics.
 *
 * @param[in] stats     The usage statistics.
 */
void null_device_stats(device_stats_ref stats)
{
        bzero(stats, sizeof(device_stats_t));
}

/** Initialize the netif module.
 *
 * @param[in] client_connection The client connection functio to be registered.
 * @return              EOK on success.
 * @return              Other error codes as defined for each specific module
 *                      message function.
 */
int netif_init_module(async_client_conn_t client_connection)
{
        ERROR_DECLARE;
        
        async_set_client_connection(client_connection);
        
        netif_globals.net_phone = connect_to_service(SERVICE_NETWORKING);
        netif_device_map_initialize(&netif_globals.device_map);
        
        ERROR_PROPAGATE(pm_init());
        
        fibril_rwlock_initialize(&netif_globals.lock);
        if (ERROR_OCCURRED(netif_initialize())) {
                pm_destroy();
                return ERROR_CODE;
        }
        
        return EOK;
}

/** Release the given packet.
 *
 * Prepared for future optimization.
 *
 * @param[in] packet_id The packet identifier.
 */
void netif_pq_release(packet_id_t packet_id)
{
        pq_release_remote(netif_globals.net_phone, packet_id);
}

/** Allocate new packet to handle the given content size.
 *
 * @param[in] content   The minimum content size.
 * @return              The allocated packet.
 * @return              NULL if there is an error.
 *
 */
packet_t netif_packet_get_1(size_t content)
{
        return packet_get_1_remote(netif_globals.net_phone, content);
}

/** Register the device notification receiver, the network interface layer
 * module.
 *
 * @param[in] name      Module name.
 * @param[in] device_id The device identifier.
 * @param[in] phone     The network interface layer module phone.
 * @return              EOK on success.
 * @return              ENOENT if there is no such device.
 * @return              ELIMIT if there is another module registered.
 */
static int register_message(const char *name, device_id_t device_id, int phone)
{
        ERROR_DECLARE;
        
        netif_device_t *device;
        ERROR_PROPAGATE(find_device(device_id, &device));
        if(device->nil_phone > 0)
                return ELIMIT;
        
        device->nil_phone = phone;
        printf("%s: Receiver of device %d registered (phone: %d)\n",
            name, device->device_id, device->nil_phone);
        return EOK;
}

/** Process the netif module messages.
 *
 * @param[in] name      Module name.
 * @param[in] callid    The message identifier.
 * @param[in] call      The message parameters.
 * @param[out] answer   The message answer parameters.
 * @param[out] answer_count The last parameter for the actual answer in the
 *                      answer parameter.
 * @return              EOK on success.
 * @return              ENOTSUP if the message is not known.
 * @return              Other error codes as defined for each specific module
 *                      message function.
 *
 * @see IS_NET_NETIF_MESSAGE()
 *
 */
int netif_module_message_standalone(const char *name, ipc_callid_t callid,
    ipc_call_t *call, ipc_call_t *answer, int *answer_count)
{
        ERROR_DECLARE;
        
        size_t length;
        device_stats_t stats;
        packet_t packet;
        measured_string_t address;
        
        *answer_count = 0;
        switch (IPC_GET_METHOD(*call)) {
        case IPC_M_PHONE_HUNGUP:
                return EOK;
        
        case NET_NETIF_PROBE:
                return netif_probe_req_local(0, IPC_GET_DEVICE(call),
                    NETIF_GET_IRQ(call), NETIF_GET_IO(call));
                    
        case IPC_M_CONNECT_TO_ME:
                fibril_rwlock_write_lock(&netif_globals.lock);
                ERROR_CODE = register_message(name, IPC_GET_DEVICE(call),
                    IPC_GET_PHONE(call));
                fibril_rwlock_write_unlock(&netif_globals.lock);
                return ERROR_CODE;
                
        case NET_NETIF_SEND:
                ERROR_PROPAGATE(packet_translate_remote(netif_globals.net_phone,
                    &packet, IPC_GET_PACKET(call)));
                return netif_send_msg_local(0, IPC_GET_DEVICE(call), packet,
                    IPC_GET_SENDER(call));
                    
        case NET_NETIF_START:
                return netif_start_req_local(0, IPC_GET_DEVICE(call));
                
        case NET_NETIF_STATS:
                fibril_rwlock_read_lock(&netif_globals.lock);

                if (ERROR_OCCURRED(async_data_read_receive(&callid, &length))) {
                        fibril_rwlock_read_unlock(&netif_globals.lock);
                        return ERROR_CODE;
                }
                if (length < sizeof(device_stats_t)) {
                        fibril_rwlock_read_unlock(&netif_globals.lock);
                        return EOVERFLOW;
                }

                if (ERROR_NONE(netif_get_device_stats(IPC_GET_DEVICE(call),
                    &stats))) {
                        ERROR_CODE = async_data_read_finalize(callid, &stats,
                            sizeof(device_stats_t));
                }

                fibril_rwlock_read_unlock(&netif_globals.lock);
                return ERROR_CODE;

        case NET_NETIF_STOP:
                return netif_stop_req_local(0, IPC_GET_DEVICE(call));
                
        case NET_NETIF_GET_ADDR:
                fibril_rwlock_read_lock(&netif_globals.lock);
                if (ERROR_NONE(netif_get_addr_message(IPC_GET_DEVICE(call),
                    &address)))
                        ERROR_CODE = measured_strings_reply(&address, 1);
                fibril_rwlock_read_unlock(&netif_globals.lock);
                return ERROR_CODE;
        }
        
        return netif_specific_message(callid, call, answer, answer_count);
}

/** Start the network interface module.
 *
 * Initialize the client connection serving function, initialize the module,
 * registers the module service and start the async manager, processing IPC
 * messages in an infinite loop.
 *
 * @param[in] client_connection The client connection processing function.
 *                      The module skeleton propagates its own one.
 * @return              EOK on success.
 * @return              Other error codes as defined for each specific module
 *                      message function.
 */
int netif_module_start_standalone(async_client_conn_t client_connection)
{
        ERROR_DECLARE;
        
        ERROR_PROPAGATE(netif_init_module(client_connection));
        
        async_manager();
        
        pm_destroy();
        return EOK;
}

/** @}
 */