WebSVN – HelenOS – Diff – /branches/network/uspace/srv/net/tl/udp/udp.c


/*
 * Copyright (c) 2008 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 udp
 *  @{
 */
 
/** @file
 *  UDP module implementation.
 *  @see udp.h
 */
 
#include <async.h>
#include <fibril_sync.h>
#include <malloc.h>
#include <stdio.h>
 
#include <ipc/ipc.h>
#include <ipc/services.h>
 
#include "../../err.h"
#include "../../messages.h"
#include "../../modules.h"
 
#include "../../structures/dynamic_fifo.h"
#include "../../structures/packet/packet_client.h"
 
#include "../../include/checksum.h"
#include "../../include/in.h"
#include "../../include/in6.h"
#include "../../include/inet.h"
#include "../../include/ip_client.h"
#include "../../include/ip_interface.h"
#include "../../include/ip_protocols.h"
#include "../../include/icmp_client.h"
#include "../../include/icmp_interface.h"
#include "../../include/net_interface.h"
#include "../../include/socket_codes.h"
#include "../../include/socket_errno.h"
 
#include "../../socket/socket_core.h"
#include "../../socket/socket_messages.h"
 
#include "../tl_common.h"
#include "../tl_messages.h"
 
#include "udp.h"
#include "udp_header.h"
#include "udp_module.h"
 
/** Default UDP checksum computing.
 */
#define NET_DEFAULT_UDP_CHECKSUM_COMPUTING  true
 
/** Default UDP autobind when sending via unbound sockets.
 */
#define NET_DEFAULT_UDP_AUTOBINDING true
 
/** Maximum UDP fragment size.
 */
#define MAX_UDP_FRAGMENT_SIZE   65535
 
/** Free ports pool start.
 */
#define UDP_FREE_PORTS_START    1025
 
/** Free ports pool end.
 */
#define UDP_FREE_PORTS_END      65535
 
/** Processes the received UDP packet queue.
 *  Is used as an entry point from the underlying IP module.
 *  Locks the global lock and calls udp_process_packet() function.
 *  @param device_id The device identifier. Ignored parameter.
 *  @param packet The received packet queue. Input/output parameter.
 *  @param receiver The target service. Ignored parameter.
 *  @param error The packet error reporting service. Prefixes the received packet. Input parameter.
 *  @returns EOK on success.
 *  @returns Other error codes as defined for the udp_process_packet() function.
 */
int udp_received_msg( device_id_t device_id, packet_t packet, services_t receiver, services_t error );
 
/** Processes the received UDP packet queue.
 *  Notifies the destination socket application.
 *  Releases the packet on error or sends an ICMP error notification..
 *  @param packet The received packet queue. Input/output parameter.
 *  @param error The packet error reporting service. Prefixes the received packet. Input parameter.
 *  @returns EOK on success.
 *  @returns EINVAL if the packet is not valid.
 *  @returns EINVAL if the stored packet address is not the an_addr_t.
 *  @returns EINVAL if the packet does not contain any data.
 *  @returns NO_DATA if the packet content is shorter than the user datagram header.
 *  @returns ENOMEM if there is not enough memory left.
 *  @returns EADDRNOTAVAIL if the destination socket does not exist.
 *  @returns Other error codes as defined for the ip_client_process_packet() function.
 */
int udp_process_packet( packet_t packet, services_t error );
 
/** Releases the packet and returns the result.
 *  @param packet The packet queue to be released. Input parameter.
 *  @param result The result to be returned. Input parameter.
 *  @return The result parameter.
 */
int udp_release_and_return( packet_t packet, int result );
 
/** @name Socket messages processing functions
 */
/*@{*/
 
/** Processes the socket client messages.
 *  Runs until the client module disconnects.
 *  @param callid The message identifier. Input parameter.
 *  @param call The message parameters. Input parameter.
 *  @returns EOK on success.
 *  @see socket.h
 */
int udp_process_client_messages( ipc_callid_t callid, ipc_call_t call );
 
/** Sends data from the socket to the remote address.
 *  Binds the socket to a free port if not already connected/bound.
 *  Handles the NET_SOCKET_SENDTO message.
 *  Supports AF_INET and AF_INET6 address families.
 *  @param local_sockets The application local sockets. Input/output parameter.
 *  @param socket_id Socket identifier. Input parameter.
 *  @param addr The destination address. Input parameter.
 *  @param addrlen The address length. Input parameter.
 *  @param fragments The number of data fragments. Input parameter.
 *  @param data_fragment_size The data fragment size in bytes. Input parameter.
 *  @param flags Various send flags. Input parameter.
 *  @returns EOK on success.
 *  @returns EAFNOTSUPPORT if the address family is not supported.
 *  @returns ENOTSOCK if the socket is not found.
 *  @returns EINVAL if the address is invalid.
 *  @returns ENOTCONN if the sending socket is not and cannot be bound.
 *  @returns ENOMEM if there is not enough memory left.
 *  @returns Other error codes as defined for the socket_read_packet_data() function.
 *  @returns Other error codes as defined for the ip_client_prepare_packet() function.
 *  @returns Other error codes as defined for the ip_send_msg() function.
 */
int udp_sendto_message( socket_cores_ref local_sockets, int socket_id, const struct sockaddr * addr, socklen_t addrlen, int fragments, size_t data_fragment_size, int flags );
 
/** Receives data to the socket.
 *  Handles the NET_SOCKET_RECVFROM message.
 *  Replies the source address as well.
 *  @param local_sockets The application local sockets. Input parameter.
 *  @param socket_id Socket identifier. Input parameter.
 *  @param flags Various receive flags. Input parameter.
 *  @param addrlen The source address length. Output parameter.
 *  @returns The number of bytes received.
 *  @returns ENOTSOCK if the socket is not found.
 *  @returns NO_DATA if there are no received packets or data.
 *  @returns ENOMEM if there is not enough memory left.
 *  @returns EINVAL if the received address is not an IP address.
 *  @returns Other error codes as defined for the packet_translate() function.
 *  @returns Other error codes as defined for the data_reply() function.
 */
int udp_recvfrom_message( socket_cores_ref local_sockets, int socket_id, int flags, size_t * addrlen );
 
/*@}*/
 
/** UDP global data.
 */
udp_globals_t   udp_globals;
 
int udp_initialize( async_client_conn_t client_connection ){
    ERROR_DECLARE;
 
    measured_string_t   names[] = {{ "UDP_CHECKSUM_COMPUTING", 22 }, { "UDP_AUTOBINDING", 15 }};
    measured_string_ref configuration;
    size_t              count = sizeof( names ) / sizeof( measured_string_t );
    char *              data;
 
    fibril_rwlock_initialize( & udp_globals.lock );
    fibril_rwlock_write_lock( & udp_globals.lock );
    udp_globals.icmp_phone = icmp_connect_module( SERVICE_ICMP );
    if( udp_globals.icmp_phone < 0 ){
        return udp_globals.icmp_phone;
    }
    udp_globals.ip_phone = ip_bind_service( SERVICE_IP, IPPROTO_UDP, SERVICE_UDP, client_connection, udp_received_msg );
    if( udp_globals.ip_phone < 0 ){
        return udp_globals.ip_phone;
    }
    ERROR_PROPAGATE( ip_packet_size_req( udp_globals.ip_phone, -1, & udp_globals.packet_dimension.addr_len, & udp_globals.packet_dimension.prefix, & udp_globals.packet_dimension.content, & udp_globals.packet_dimension.suffix ));
    ERROR_PROPAGATE( socket_ports_initialize( & udp_globals.sockets ));
    udp_globals.packet_dimension.prefix += sizeof( udp_header_t );
    udp_globals.packet_dimension.content -= sizeof( udp_header_t );
    udp_globals.last_used_port = UDP_FREE_PORTS_START - 1;
    // get configuration
    udp_globals.checksum_computing = NET_DEFAULT_UDP_CHECKSUM_COMPUTING;
    udp_globals.autobinding = NET_DEFAULT_UDP_AUTOBINDING;
    configuration = & names[ 0 ];
    ERROR_PROPAGATE( net_get_conf_req( udp_globals.net_phone, & configuration, count, & data ));
    if( configuration ){
        if( configuration[ 0 ].value ){
            udp_globals.checksum_computing = ( configuration[ 0 ].value[ 0 ] == 'y' );
        }
        if( configuration[ 1 ].value ){
            udp_globals.autobinding = ( configuration[ 1 ].value[ 0 ] == 'y' );
        }
        net_free_settings( configuration, data );
    }
    fibril_rwlock_write_unlock( & udp_globals.lock );
    return EOK;
}
 
int udp_received_msg( device_id_t device_id, packet_t packet, services_t receiver, services_t error ){
    int result;
 
    fibril_rwlock_write_lock( & udp_globals.lock );
    result = udp_process_packet( packet, error );
    if( result != EOK ){
        fibril_rwlock_write_unlock( & udp_globals.lock );
    }
 
    return result;
}
 
int udp_process_packet( packet_t packet, services_t error ){
    ERROR_DECLARE;
 
    size_t          length;
    size_t          offset;
    int             result;
    udp_header_ref  header;
    socket_core_ref socket;
    packet_t        next_packet;
    size_t          total_length;
    uint32_t        checksum;
    int             fragments;
    packet_t        tmp_packet;
    icmp_type_t     type;
    icmp_code_t     code;
    ip_pseudo_header_ref    ip_header;
    struct sockaddr *       src;
    struct sockaddr *       dest;
 
    if( error ){
        switch( error ){
            case SERVICE_ICMP:
                // ignore error
                // length = icmp_client_header_length( packet );
                // process error
                result = icmp_client_process_packet( packet, & type, & code, NULL, NULL );
                if( result < 0 ){
                    return udp_release_and_return( packet, result );
                }
                length = ( size_t ) result;
                if( ERROR_OCCURRED( packet_trim( packet, length, 0 ))){
                    return udp_release_and_return( packet, ERROR_CODE );
                }
                break;
            default:
                return udp_release_and_return( packet, ENOTSUP );
        }
    }
    // TODO process received ipopts?
    result = ip_client_process_packet( packet, NULL, NULL, NULL, NULL, NULL );
    if( result < 0 ){
        return udp_release_and_return( packet, result );
    }
    offset = ( size_t ) result;
 
    length = packet_get_data_length( packet );
    if( length <= 0 ){
        return udp_release_and_return( packet, EINVAL );
    }
    if( length < sizeof( udp_header_t ) + offset ){
        return udp_release_and_return( packet, NO_DATA );
    }
 
    // trim all but UDP header
    if( ERROR_OCCURRED( packet_trim( packet, offset, 0 ))){
        return udp_release_and_return( packet, ERROR_CODE );
    }
 
    // get udp header
    header = ( udp_header_ref ) packet_get_data( packet );
    if( ! header ){
        return udp_release_and_return( packet, NO_DATA );
    }
    // find the destination socket
    socket = socket_port_find( & udp_globals.sockets, ntohs( header->destination_port ), SOCKET_MAP_KEY_LISTENING, 0 );
    if( ! socket ){
        if( tl_prepare_icmp_packet( udp_globals.net_phone, udp_globals.icmp_phone, packet, error ) == EOK ){
            icmp_destination_unreachable_msg( udp_globals.icmp_phone, ICMP_PORT_UNREACH, 0, packet );
        }
        return EADDRNOTAVAIL;
    }
 
    // count the received packet fragments
    next_packet = packet;
    fragments = 0;
    total_length = ntohs( header->total_length );
    // compute header checksum if set
    if( header->checksum && ( ! error )){
        result = packet_get_addr( packet, ( uint8_t ** ) & src, ( uint8_t ** ) & dest );
        if( result <= 0 ){
            return udp_release_and_return( packet, result );
        }
        if( ERROR_OCCURRED( ip_client_get_pseudo_header( IPPROTO_UDP, src, result, dest, result, total_length, & ip_header, & length ))){
            return udp_release_and_return( packet, ERROR_CODE );
        }else{
            checksum = compute_checksum( 0, ip_header, length );
            // the udp header checksum will be added with the first fragment later
            free( ip_header );
        }
    }else{
        header->checksum = 0;
        checksum = 0;
    }
 
    do{
        ++ fragments;
        length = packet_get_data_length( next_packet );
        if( length <= 0 ){
            return udp_release_and_return( packet, NO_DATA );
        }
        if( total_length < length ){
            if( ERROR_OCCURRED( packet_trim( next_packet, 0, length - total_length ))){
                return udp_release_and_return( packet, ERROR_CODE );
            }
            // add partial checksum if set
            if( header->checksum ){
                checksum = compute_checksum( checksum, packet_get_data( packet ), packet_get_data_length( packet ));
            }
            // relese the rest of the packet fragments
            tmp_packet = pq_next( next_packet );
            while( tmp_packet ){
                next_packet = pq_detach( tmp_packet );
                pq_release( udp_globals.net_phone, packet_get_id( tmp_packet ));
                tmp_packet = next_packet;
            }
            // exit the loop
            break;
        }
        total_length -= length;
        // add partial checksum if set
        if( header->checksum ){
            checksum = compute_checksum( checksum, packet_get_data( packet ), packet_get_data_length( packet ));
        }
    }while(( next_packet = pq_next( next_packet )) && ( total_length > 0 ));
 
    // check checksum
    if( header->checksum ){
        if( flip_checksum( compact_checksum( checksum ))){
            if( tl_prepare_icmp_packet( udp_globals.net_phone, udp_globals.icmp_phone, packet, error ) == EOK ){
                // checksum error ICMP
                icmp_parameter_problem_msg( udp_globals.icmp_phone, ICMP_PARAM_POINTER, (( size_t ) (( void * ) & header->checksum )) - (( size_t ) (( void * ) header )), packet );
            }
            return EINVAL;
        }
    }
 
    // queue the received packet
    if( ERROR_OCCURRED( dyn_fifo_push( & socket->received, packet_get_id( packet ), SOCKET_MAX_RECEIVED_SIZE ))){
        return udp_release_and_return( packet, ERROR_CODE );
    }
 
    // notify the destination socket
    fibril_rwlock_write_unlock( & udp_globals.lock );
    async_msg_5( socket->phone, NET_SOCKET_RECEIVED, ( ipcarg_t ) socket->socket_id, 0, 0, 0, ( ipcarg_t ) fragments );
    return EOK;
}
 
int udp_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
    ERROR_DECLARE;
 
    packet_t    packet;
 
    * answer_count = 0;
    switch( IPC_GET_METHOD( * call )){
        case NET_TL_RECEIVED:
            if( ! ERROR_OCCURRED( packet_translate( udp_globals.net_phone, & packet, IPC_GET_PACKET( call )))){
                ERROR_CODE = udp_received_msg( IPC_GET_DEVICE( call ), packet, SERVICE_UDP, IPC_GET_ERROR( call ));
            }
            return ERROR_CODE;
        case IPC_M_CONNECT_TO_ME:
            return udp_process_client_messages( callid, * call );
    }
    return ENOTSUP;
}
 
int udp_process_client_messages( ipc_callid_t callid, ipc_call_t call ){
    int                     res;
    bool                    keep_on_going = true;
    socket_cores_t          local_sockets;
    int                     app_phone = IPC_GET_PHONE( & call );
    struct sockaddr *       addr;
    size_t                  addrlen;
    fibril_rwlock_t         lock;
    ipc_call_t              answer;
    int                     answer_count;
 
    /*
     * Accept the connection
     *  - Answer the first IPC_M_CONNECT_TO_ME call.
     */
    ipc_answer_0( callid, EOK );
 
    // The client connection is only in one fibril and therefore no additional locks are needed.
 
    socket_cores_initialize( & local_sockets );
    fibril_rwlock_initialize( & lock );
 
    while( keep_on_going ){
        // refresh data
        refresh_answer( & answer, & answer_count );
 
        callid = async_get_call( & call );
//      printf( "message %d\n", IPC_GET_METHOD( * call ));
 
        switch( IPC_GET_METHOD( call )){
            case IPC_M_PHONE_HUNGUP:
                keep_on_going = false;
                res = EOK;
                break;
            case NET_SOCKET:
                fibril_rwlock_write_lock( & lock );
                res = socket_create( & local_sockets, app_phone, NULL, SOCKET_SET_SOCKET_ID( answer ));
                fibril_rwlock_write_unlock( & lock );
                // TODO max fragment size
                * SOCKET_SET_DATA_FRAGMENT_SIZE( answer ) = MAX_UDP_FRAGMENT_SIZE;
                * SOCKET_SET_HEADER_SIZE( answer ) = sizeof( udp_header_t );
                answer_count = 3;
                break;
            case NET_SOCKET_BIND:
                res = data_receive(( void ** ) & addr, & addrlen );
                if( res == EOK ){
                    fibril_rwlock_read_lock( & lock );
                    fibril_rwlock_write_lock( & udp_globals.lock );
                    res = socket_bind( & local_sockets, & udp_globals.sockets, SOCKET_GET_SOCKET_ID( call ), addr, addrlen, UDP_FREE_PORTS_START, UDP_FREE_PORTS_END, udp_globals.last_used_port );
                    fibril_rwlock_write_unlock( & udp_globals.lock );
                    fibril_rwlock_read_unlock( & lock );
                    free( addr );
                }
                break;
            case NET_SOCKET_SENDTO:
                res = data_receive(( void ** ) & addr, & addrlen );
                if( res == EOK ){
                    fibril_rwlock_read_lock( & lock );
                    fibril_rwlock_write_lock( & udp_globals.lock );
                    res = udp_sendto_message( & local_sockets, SOCKET_GET_SOCKET_ID( call ), addr, addrlen, SOCKET_GET_DATA_FRAGMENTS( call ), SOCKET_GET_DATA_FRAGMENT_SIZE( call ), SOCKET_GET_FLAGS( call ));
                    if( res != EOK ){
                        fibril_rwlock_write_unlock( & udp_globals.lock );
                    }
                    fibril_rwlock_read_unlock( & lock );
                    free( addr );
                }
                break;
            case NET_SOCKET_RECVFROM:
                fibril_rwlock_read_lock( & lock );
                fibril_rwlock_write_lock( & udp_globals.lock );
                res = udp_recvfrom_message( & local_sockets, SOCKET_GET_SOCKET_ID( call ), SOCKET_GET_FLAGS( call ), & addrlen );
                fibril_rwlock_write_unlock( & udp_globals.lock );
                fibril_rwlock_read_unlock( & lock );
                if( res > 0 ){
                    * SOCKET_SET_READ_DATA_LENGTH( answer ) = res;
                    * SOCKET_SET_ADDRESS_LENGTH( answer ) = addrlen;
                    answer_count = 2;
                    res = EOK;
                }
                break;
            case NET_SOCKET_CLOSE:
                fibril_rwlock_write_lock( & lock );
                fibril_rwlock_write_lock( & udp_globals.lock );
                res = socket_destroy( udp_globals.net_phone, SOCKET_GET_SOCKET_ID( call ), & local_sockets, & udp_globals.sockets, NULL );
                fibril_rwlock_write_unlock( & udp_globals.lock );
                fibril_rwlock_write_unlock( & lock );
                break;
            case NET_SOCKET_GETSOCKOPT:
            case NET_SOCKET_SETSOCKOPT:
            default:
                res = ENOTSUP;
                break;
        }
 
//      printf( "res = %d\n", res );
 
        answer_call( callid, res, & answer, answer_count );
    }
 
    // release all local sockets
    socket_cores_release( udp_globals.net_phone, & local_sockets, & udp_globals.sockets, NULL );
 
    return EOK;
}
 
int udp_sendto_message( socket_cores_ref local_sockets, int socket_id, const struct sockaddr * addr, socklen_t addrlen, int fragments, size_t data_fragment_size, int flags ){
    ERROR_DECLARE;
 
    socket_core_ref         socket;
    packet_t                packet;
    packet_t                next_packet;
    udp_header_ref          header;
    int                     index;
    size_t                  total_length;
    int                     result;
    uint16_t                dest_port;
    uint32_t                checksum;
    ip_pseudo_header_ref    ip_header;
    size_t                  headerlen;
    device_id_t             device_id;
 
    ERROR_PROPAGATE( tl_get_address_port( addr, addrlen, & dest_port ));
 
    socket = socket_cores_find( local_sockets, socket_id );
    if( ! socket ) return ENOTSOCK;
 
    if(( socket->port <= 0 ) && udp_globals.autobinding ){
        // bind the socket to a random free port if not bound
//      do{
            // try to find a free port
//          fibril_rwlock_read_unlock( & udp_globals.lock );
//          fibril_rwlock_write_lock( & udp_globals.lock );
            // might be changed in the meantime
//          if( socket->port <= 0 ){
                if( ERROR_OCCURRED( socket_bind_free_port( & udp_globals.sockets, socket, UDP_FREE_PORTS_START, UDP_FREE_PORTS_END, udp_globals.last_used_port ))){
//                  fibril_rwlock_write_unlock( & udp_globals.lock );
//                  fibril_rwlock_read_lock( & udp_globals.lock );
                    return ERROR_CODE;
                }
                // set the next port as the search starting port number
                udp_globals.last_used_port = socket->port;
//          }
//          fibril_rwlock_write_unlock( & udp_globals.lock );
//          fibril_rwlock_read_lock( & udp_globals.lock );
            // might be changed in the meantime
//      }while( socket->port <= 0 );
    }
 
    // TODO do not ask all the time
    ERROR_PROPAGATE( ip_packet_size_req( udp_globals.ip_phone, -1, & udp_globals.packet_dimension.addr_len, & udp_globals.packet_dimension.prefix, & udp_globals.packet_dimension.content, & udp_globals.packet_dimension.suffix ));
 
    // read the first packet fragment
    result = tl_socket_read_packet_data( udp_globals.net_phone, & packet, sizeof( udp_header_t ), & udp_globals.packet_dimension, addr, addrlen );
    if( result < 0 ) return result;
    total_length = ( size_t ) result;
    if( udp_globals.checksum_computing ){
        checksum = compute_checksum( 0, packet_get_data( packet ), packet_get_data_length( packet ));
    }else{
        checksum = 0;
    }
    // prefix the udp header
    header = PACKET_PREFIX( packet, udp_header_t );
    if( ! header ){
        return udp_release_and_return( packet, ENOMEM );
    }
    bzero( header, sizeof( * header ));
    // read the rest of the packet fragments
    for( index = 1; index < fragments; ++ index ){
        result = tl_socket_read_packet_data( udp_globals.net_phone, & next_packet, 0, & udp_globals.packet_dimension, addr, addrlen );
        if( result < 0 ){
            return udp_release_and_return( packet, result );
        }
        packet = pq_add( packet, next_packet, index, 0 );
        total_length += ( size_t ) result;
        if( udp_globals.checksum_computing ){
            checksum = compute_checksum( checksum, packet_get_data( next_packet ), packet_get_data_length( next_packet ));
        }
    }
    // set the udp header
    header->source_port = htons(( socket->port > 0 ) ? socket->port : 0 );
    header->destination_port = htons( dest_port );
    header->total_length = htons( total_length + sizeof( * header ));
    header->checksum = 0;
    if( udp_globals.checksum_computing ){
        if( ERROR_OCCURRED( ip_get_route_req( udp_globals.ip_phone, IPPROTO_UDP, addr, addrlen, & device_id, & ip_header, & headerlen ))){
            return udp_release_and_return( packet, ERROR_CODE );
        }
        if( ERROR_OCCURRED( ip_client_set_pseudo_header_data_length( ip_header, headerlen, total_length + sizeof( udp_header_t )))){
            free( ip_header );
            return udp_release_and_return( packet, ERROR_CODE );
        }
        checksum = compute_checksum( checksum, ip_header, headerlen );
        checksum = compute_checksum( checksum, ( uint8_t * ) header, sizeof( * header ));
        header->checksum = htons( flip_checksum( compact_checksum( checksum )));
        free( ip_header );
    }else{
        device_id = -1;
    }
    // prepare the first packet fragment
    if( ERROR_OCCURRED( ip_client_prepare_packet( packet, IPPROTO_UDP, 0, 0, 0, 0 ))){
        return udp_release_and_return( packet, ERROR_CODE );
    }
    // send the packet
    fibril_rwlock_write_unlock( & udp_globals.lock );
    ip_send_msg( udp_globals.ip_phone, device_id, packet, SERVICE_UDP, 0 );
    return EOK;
}
 
int udp_recvfrom_message( socket_cores_ref local_sockets, int socket_id, int flags, size_t * addrlen ){
    ERROR_DECLARE;
 
    socket_core_ref socket;
    int             packet_id;
    packet_t        packet;
    udp_header_ref  header;
    struct sockaddr *   addr;
    size_t          length;
    uint8_t *       data;
    int             result;
 
    // find the socket
    socket = socket_cores_find( local_sockets, socket_id );
    if( ! socket ) return ENOTSOCK;
    // get the next received packet
    packet_id = dyn_fifo_value( & socket->received );
    if( packet_id < 0 ) return NO_DATA;
    ERROR_PROPAGATE( packet_translate( udp_globals.net_phone, & packet, packet_id ));
    // get udp header
    data = packet_get_data( packet );
    if( ! data ){
        pq_release( udp_globals.net_phone, packet_id );
        return NO_DATA;
    }
    header = ( udp_header_ref ) data;
 
    // set the source address port
    result = packet_get_addr( packet, ( uint8_t ** ) & addr, NULL );
    if( ERROR_OCCURRED( tl_set_address_port( addr, result, ntohs( header->source_port )))){
        pq_release( udp_globals.net_phone, packet_id );
        return ERROR_CODE;
    }
    * addrlen = ( size_t ) result;
    // send the source address
    ERROR_PROPAGATE( data_reply( addr, * addrlen ));
 
    // trim the header
    ERROR_PROPAGATE( packet_trim( packet, sizeof( udp_header_t ), 0 ));
 
    // reply the packets
    ERROR_PROPAGATE( socket_reply_packets( packet, & length ));
 
    // release the packet
    dyn_fifo_pop( & socket->received );
    pq_release( udp_globals.net_phone, packet_get_id( packet ));
    // return the total length
    return ( int ) length;
}
 
int udp_release_and_return( packet_t packet, int result ){
    pq_release( udp_globals.net_phone, packet_get_id( packet ));
    return result;
}
 
/** @}
 */
 
Subversion Repositories HelenOS

(root)/branches/network/uspace/srv/net/tl/udp/udp.c – Rev 4738 → 4743
