netif_skel.c

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/*
 * 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.
 */

#include <async.h>
#include <mem.h>
#include <fibril_synch.h>
#include <stdio.h>
#include <ipc/services.h>
#include <ipc/netif.h>
#include <errno.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 <netif_skel.h>
#include <nil_remote.h>

DEVICE_MAP_IMPLEMENT(netif_device_map, netif_device_t);

netif_globals_t netif_globals;

static int netif_probe_req_local(int netif_phone, device_id_t device_id,
    int irq, void *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;
}

static 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;
}

static int netif_start_req_local(int netif_phone, device_id_t device_id)
{
        fibril_rwlock_write_lock(&netif_globals.lock);
        
        netif_device_t *device;
        int rc = find_device(device_id, &device);
        if (rc != EOK) {
                fibril_rwlock_write_unlock(&netif_globals.lock);
                return rc;
        }
        
        int result = netif_start_message(device);
        if (result > NETIF_NULL) {
                int phone = device->nil_phone;
                nil_device_state_msg(phone, device_id, result);
                fibril_rwlock_write_unlock(&netif_globals.lock);
                return EOK;
        }
        
        fibril_rwlock_write_unlock(&netif_globals.lock);
        
        return result;
}

static int netif_stop_req_local(int netif_phone, device_id_t device_id)
{
        fibril_rwlock_write_lock(&netif_globals.lock);
        
        netif_device_t *device;
        int rc = find_device(device_id, &device);
        if (rc != EOK) {
                fibril_rwlock_write_unlock(&netif_globals.lock);
                return rc;
        }
        
        int result = netif_stop_message(device);
        if (result > NETIF_NULL) {
                int phone = device->nil_phone;
                nil_device_state_msg(phone, device_id, result);
                fibril_rwlock_write_unlock(&netif_globals.lock);
                return EOK;
        }
        
        fibril_rwlock_write_unlock(&netif_globals.lock);
        
        return result;
}

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;
}

void null_device_stats(device_stats_t *stats)
{
        bzero(stats, sizeof(device_stats_t));
}

void netif_pq_release(packet_id_t packet_id)
{
        pq_release_remote(netif_globals.net_phone, packet_id);
}

packet_t *netif_packet_get_1(size_t content)
{
        return packet_get_1_remote(netif_globals.net_phone, content);
}

static int register_message(device_id_t device_id, int phone)
{
        netif_device_t *device;
        int rc = find_device(device_id, &device);
        if (rc != EOK)
                return rc;
        
        if (device->nil_phone >= 0)
                return ELIMIT;
        
        device->nil_phone = phone;
        return EOK;
}

static int netif_module_message(ipc_callid_t callid, ipc_call_t *call,
    ipc_call_t *answer, size_t *count)
{
        size_t length;
        device_stats_t stats;
        packet_t *packet;
        measured_string_t address;
        int rc;
        
        *count = 0;
        
        switch (IPC_GET_IMETHOD(*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);
                
                rc = register_message(IPC_GET_DEVICE(*call), IPC_GET_PHONE(*call));
                
                fibril_rwlock_write_unlock(&netif_globals.lock);
                return rc;
        
        case NET_NETIF_SEND:
                rc = packet_translate_remote(netif_globals.net_phone, &packet,
                    IPC_GET_PACKET(*call));
                if (rc != EOK)
                        return rc;
                
                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);
                
                rc = async_data_read_receive(&callid, &length);
                if (rc != EOK) {
                        fibril_rwlock_read_unlock(&netif_globals.lock);
                        return rc;
                }
                
                if (length < sizeof(device_stats_t)) {
                        fibril_rwlock_read_unlock(&netif_globals.lock);
                        return EOVERFLOW;
                }
                
                rc = netif_get_device_stats(IPC_GET_DEVICE(*call), &stats);
                if (rc == EOK) {
                        rc = async_data_read_finalize(callid, &stats,
                            sizeof(device_stats_t));
                }
                
                fibril_rwlock_read_unlock(&netif_globals.lock);
                return rc;
        
        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);
                
                rc = netif_get_addr_message(IPC_GET_DEVICE(*call), &address);
                if (rc == EOK)
                        rc = measured_strings_reply(&address, 1);
                
                fibril_rwlock_read_unlock(&netif_globals.lock);
                return rc;
        }
        
        return netif_specific_message(callid, call, answer, count);
}

static void netif_client_connection(ipc_callid_t iid, ipc_call_t *icall)
{
        /*
         * Accept the connection by answering
         * the initial IPC_M_CONNECT_ME_TO call.
         */
        async_answer_0(iid, EOK);
        
        while (true) {
                ipc_call_t answer;
                size_t count;
                
                /* Clear the answer structure */
                refresh_answer(&answer, &count);
                
                /* Fetch the next message */
                ipc_call_t call;
                ipc_callid_t callid = async_get_call(&call);
                
                /* Process the message */
                int res = netif_module_message(callid, &call, &answer, &count);
                
                /* End if said to either by the message or the processing result */
                if ((IPC_GET_IMETHOD(call) == IPC_M_PHONE_HUNGUP) ||
                    (res == EHANGUP))
                        return;
                
                /* Answer the message */
                answer_call(callid, res, &answer, count);
        }
}

int netif_module_start(void)
{
        async_set_client_connection(netif_client_connection);
        
        netif_globals.net_phone = connect_to_service(SERVICE_NETWORKING);
        netif_device_map_initialize(&netif_globals.device_map);
        
        int rc = pm_init();
        if (rc != EOK)
                return rc;
        
        fibril_rwlock_initialize(&netif_globals.lock);
        
        rc = netif_initialize();
        if (rc != EOK) {
                pm_destroy();
                return rc;
        }
        
        async_manager();
        
        pm_destroy();
        return EOK;
}

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