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  1. /*
  2.  * Copyright (c) 2008 Lukas Mejdrech
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup udp
  30.  *  @{
  31.  */
  32.  
  33. /** @file
  34.  *  UDP module implementation.
  35.  *  @see udp.h
  36.  */
  37.  
  38. #include <async.h>
  39. #include <fibril_sync.h>
  40. #include <malloc.h>
  41.  
  42. #include <ipc/ipc.h>
  43. #include <ipc/services.h>
  44.  
  45. #include "../../err.h"
  46. #include "../../messages.h"
  47. #include "../../modules.h"
  48.  
  49. #include "../../structures/dynamic_fifo.h"
  50. #include "../../structures/packet/packet_client.h"
  51.  
  52. #include "../../include/in.h"
  53. #include "../../include/in6.h"
  54. #include "../../include/inet.h"
  55. #include "../../include/ip_client.h"
  56. #include "../../include/ip_interface.h"
  57. #include "../../include/ip_protocols.h"
  58. #include "../../include/icmp_client.h"
  59. #include "../../include/icmp_interface.h"
  60. #include "../../include/socket_codes.h"
  61. #include "../../include/socket_errno.h"
  62.  
  63. #include "../../socket/socket_core.h"
  64. #include "../../socket/socket_messages.h"
  65.  
  66. #include "../tl_messages.h"
  67.  
  68. #include "udp.h"
  69. #include "udp_header.h"
  70. #include "udp_module.h"
  71.  
  72. /** Maximum UDP fragment size.
  73.  */
  74. #define MAX_UDP_FRAGMENT_SIZE   65535
  75.  
  76. /** Free ports pool start.
  77.  */
  78. #define UDP_FREE_PORTS_START    1025
  79.  
  80. /** Free ports pool end.
  81.  */
  82. #define UDP_FREE_PORTS_END      65535
  83.  
  84. /** Processes the received UDP packet queue.
  85.  *  Is used as an entry point from the underlying IP module.
  86.  *  Notifies the destination socket application.
  87.  *  Releases the packet on error or send an ICMP error notification..
  88.  *  @param device_id The device identifier. Ignored parameter.
  89.  *  @param packet The received packet queue. Input/output parameter.
  90.  *  @param receiver The target service. Ignored parameter.
  91.  *  @param error The packet error reporting service. Prefixes the received packet. Input parameter.
  92.  *  @returns EOK on success.
  93.  *  @returns EINVAL if the packet is not valid.
  94.  *  @returns EINVAL if the stored packet address is not the an_addr_t.
  95.  *  @returns EINVAL if the packet does not contain any data.
  96.  *  @returns NO_DATA if the packet content is shorter than the user datagram header.
  97.  *  @returns ENOMEM if there is not enough memory left.
  98.  *  @returns EADDRNOTAVAIL if the destination socket does not exist.
  99.  *  @returns Other error codes as defined for the ip_client_process_packet() function.
  100.  */
  101. int udp_received_msg( device_id_t device_id, packet_t packet, services_t receiver, services_t error );
  102.  
  103. /** Releases the packet and returns the result.
  104.  *  @param packet The packet queue to be released. Input parameter.
  105.  *  @param result The result to be returned. Input parameter.
  106.  *  @return The result parameter.
  107.  */
  108. int udp_release_and_return( packet_t packet, int result );
  109.  
  110. /** Sends the port unreachable ICMP notification.
  111.  *  Sends the first packet and releases all the others.
  112.  *  Releases the packet queu on error.
  113.  *  @param packet The packet to be send. Input parameter.
  114.  *  @param error The packet error reporting service. Prefixes the received packet. Input parameter.
  115.  */
  116. void    udp_send_icmp_port_unreachable( packet_t packet, services_t error );
  117.  
  118. /** @name Socket messages processing functions
  119.  */
  120. /*@{*/
  121.  
  122. /** Processes the socket client messages.
  123.  *  Runs until the client module disconnects.
  124.  *  @param callid The message identifier. Input parameter.
  125.  *  @param call The message parameters. Input parameter.
  126.  *  @returns EOK on success.
  127.  *  @see socket.h
  128.  */
  129. int udp_process_client_messages( ipc_callid_t callid, ipc_call_t call );
  130.  
  131. /** Sends data from the socket to the remote address.
  132.  *  Binds the socket to a free port if not already connected/bound.
  133.  *  Handles the NET_SOCKET_SENDTO message.
  134.  *  Supports AF_INET and AF_INET6 address families.
  135.  *  @param local_sockets The application local sockets. Input/output parameter.
  136.  *  @param socket_id Socket identifier. Input parameter.
  137.  *  @param addr The destination address. Input parameter.
  138.  *  @param addrlen The address length. Input parameter.
  139.  *  @param fragments The number of data fragments. Input parameter.
  140.  *  @param flags Various send flags. Input parameter.
  141.  *  @returns EOK on success.
  142.  *  @returns EAFNOTSUPPORT if the address family is not supported.
  143.  *  @returns ENOTSOCK if the socket is not found.
  144.  *  @returns EINVAL if the address is invalid.
  145.  *  @returns ENOTCONN if the sending socket is not and cannot be bound.
  146.  *  @returns ENOMEM if there is not enough memory left.
  147.  *  @returns Other error codes as defined for the socket_read_packet_data() function.
  148.  *  @returns Other error codes as defined for the ip_client_prepare_packet() function.
  149.  *  @returns Other error codes as defined for the ip_send_msg() function.
  150.  */
  151. int udp_sendto_message( socket_cores_ref local_sockets, int socket_id, const struct sockaddr * addr, socklen_t addrlen, int fragments, int flags );
  152.  
  153. /** Receives data to the socket.
  154.  *  Handles the NET_SOCKET_RECVFROM message.
  155.  *  Replies the source address as well.
  156.  *  @param local_sockets The application local sockets. Input parameter.
  157.  *  @param socket_id Socket identifier. Input parameter.
  158.  *  @param flags Various receive flags. Input parameter.
  159.  *  @param addrlen The source address length. Output parameter.
  160.  *  @returns The number of bytes received.
  161.  *  @returns ENOTSOCK if the socket is not found.
  162.  *  @returns NO_DATA if there are no received packets or data.
  163.  *  @returns ENOMEM if there is not enough memory left.
  164.  *  @returns EINVAL if the received address is not an IP address.
  165.  *  @returns Other error codes as defined for the packet_translate() function.
  166.  *  @returns Other error codes as defined for the socket_write_data() function.
  167.  */
  168. int udp_recvfrom_message( socket_cores_ref local_sockets, int socket_id, int flags, size_t * addrlen );
  169.  
  170. /*@}*/
  171.  
  172. /** Receives data from the socket.
  173.  *  The received data buffer is allocated and returned.
  174.  *  @param data The data buffer to be filled. Output parameter.
  175.  *  @param length The buffer length. Output parameter.
  176.  *  @returns EOK on success.
  177.  *  @returns EBADMEM if the data or the length parameter is NULL.
  178.  *  @returns EINVAL if the client does not send data.
  179.  *  @returns ENOMEM if there is not enough memory left.
  180.  *  @returns Other error codes as defined for the ipc_data_write_finalize() function.
  181.  */
  182. int socket_read_data( void ** data, size_t * length );
  183.  
  184. /** Receives data from the socket into a packet.
  185.  *  @param packet The new created packet. Output parameter.
  186.  *  @param prefix Reserved packet data prefix length. Input parameter.
  187.  *  @param addr The destination address. Input parameter.
  188.  *  @param addrlen The address length. Input parameter.
  189.  *  @returns Number of bytes received.
  190.  *  @returns EINVAL if the client does not send data.
  191.  *  @returns ENOMEM if there is not enough memory left.
  192.  *  @returns Other error codes as defined for the ipc_data_read_finalize() function.
  193.  */
  194. int socket_read_packet_data( packet_ref packet, size_t prefix, const struct sockaddr * addr, socklen_t addrlen );
  195.  
  196. /** Replies the data to the socket.
  197.  *  @param data The data buffer to be sent. Input parameter.
  198.  *  @param data_length The buffer length. Input parameter.
  199.  *  @returns EOK on success.
  200.  *  @returns EINVAL if the client does not expect all the data.
  201.  *  @returns Other error codes as defined for the ipc_data_read_finalize() function.
  202.  */
  203. int socket_write_data( void * data, size_t data_length );
  204.  
  205. /** Sets the address port.
  206.  *  Supports AF_INET and AF_INET6 address families.
  207.  *  @param addr The address to be updated. Input/output parameter.
  208.  *  @param addrlen The address length. Input parameter.
  209.  *  @param port The port to be set. Input parameter.
  210.  *  @returns EOK on success.
  211.  *  @returns EINVAL if the address length does not match the address family.
  212.  *  @returns EAFNOSUPPORT if the address family is not supported.
  213.  */
  214. int udp_set_address_port( struct sockaddr * addr, int addrlen, uint16_t port );
  215.  
  216. /** UDP global data.
  217.  */
  218. udp_globals_t   udp_globals;
  219.  
  220. int udp_initialize( async_client_conn_t client_connection ){
  221.     ERROR_DECLARE;
  222.  
  223.     fibril_rwlock_initialize( & udp_globals.lock );
  224.     fibril_rwlock_write_lock( & udp_globals.lock );
  225.     udp_globals.icmp_phone = icmp_connect_module( SERVICE_ICMP );
  226.     if( udp_globals.icmp_phone < 0 ){
  227.         return udp_globals.icmp_phone;
  228.     }
  229.     udp_globals.ip_phone = ip_bind_service( SERVICE_IP, IPPROTO_UDP, SERVICE_UDP, client_connection, udp_received_msg );
  230.     if( udp_globals.ip_phone < 0 ){
  231.         return udp_globals.ip_phone;
  232.     }
  233.     ERROR_PROPAGATE( ip_packet_size_req( udp_globals.ip_phone, -1, & udp_globals.addr_len, & udp_globals.prefix, & udp_globals.content, & udp_globals.suffix ));
  234.     ERROR_PROPAGATE( socket_ports_initialize( & udp_globals.sockets ));
  235.     udp_globals.prefix += sizeof( udp_header_t );
  236.     udp_globals.content -= sizeof( udp_header_t );
  237.     udp_globals.last_used_port = UDP_FREE_PORTS_START - 1;
  238.     fibril_rwlock_write_unlock( & udp_globals.lock );
  239.     return EOK;
  240. }
  241.  
  242. int udp_received_msg( device_id_t device_id, packet_t packet, services_t receiver, services_t error ){
  243.     ERROR_DECLARE;
  244.  
  245.     size_t          length;
  246.     size_t          offset;
  247.     int             result;
  248.     uint8_t *       data;
  249.     udp_header_ref  header;
  250.     socket_core_ref *   socket;
  251.     packet_t        next_packet;
  252.     size_t          total_length;
  253. //  uint16_t        checksum;
  254.     int             fragments;
  255.     packet_t        tmp_packet;
  256.     icmp_type_t     type;
  257.     icmp_code_t     code;
  258.  
  259.     if( error ){
  260.         switch( error ){
  261.             case SERVICE_ICMP:
  262.                 // process error
  263.                 // TODO remove debug dump
  264.                 // length = icmp_client_header_length( packet );
  265.                 result = icmp_client_process_packet( packet, & type, & code, NULL, NULL );
  266.                 if( result < 0 ){
  267.                     return udp_release_and_return( packet, result );
  268.                 }
  269.                 printf( "ICMP error %d (%d) in packet %d\n", type, code, packet_get_id( packet ) );
  270.                 length = ( size_t ) result;
  271.                 if( ERROR_OCCURRED( packet_trim( packet, length, 0 ))){
  272.                     return udp_release_and_return( packet, ERROR_CODE );
  273.                 }
  274.                 break;
  275.             default:
  276.                 return udp_release_and_return( packet, ENOTSUP );
  277.         }
  278.     }
  279.     // TODO process received ipopts?
  280.     result = ip_client_process_packet( packet, NULL, NULL, NULL, NULL, NULL );
  281.     if( result < 0 ){
  282.         return udp_release_and_return( packet, result );
  283.     }
  284.     offset = ( size_t ) result;
  285.  
  286.     length = packet_get_data_length( packet );
  287.     if( length <= 0 ){
  288.         return udp_release_and_return( packet, EINVAL );
  289.     }
  290.     if( length < sizeof( udp_header_t ) + offset ){
  291.         return udp_release_and_return( packet, NO_DATA );
  292.     }
  293.     data = packet_get_data( packet );
  294.     if( ! data ){
  295.         return udp_release_and_return( packet, NO_DATA );
  296.     }
  297.     // get udp header
  298.     header = ( udp_header_ref )( data + offset );
  299.     // find the destination socket
  300.     socket = socket_ports_find( & udp_globals.sockets, ntohs( header->dest ));
  301.     if( ! socket ){
  302.         udp_send_icmp_port_unreachable( packet, error );
  303.         return EADDRNOTAVAIL;
  304.     }
  305.     // trim after successful processing to be able to send an ICMP error message!
  306.     ERROR_PROPAGATE( packet_trim( packet, offset, 0 ));
  307.     // count the received packet fragments
  308.     next_packet = packet;
  309.     fragments = 0;
  310.     total_length = ntohs( header->len );
  311.     do{
  312.         ++ fragments;
  313.         length = packet_get_data_length( packet );
  314.         if( length <= 0 ){
  315.             return udp_release_and_return( packet, NO_DATA );
  316.         }
  317.         if( total_length < length ){
  318.             // cut of the suffix if too long
  319.             if( ERROR_OCCURRED( packet_trim( next_packet, 0, length - total_length ))){
  320.                 return udp_release_and_return( packet, ERROR_CODE );
  321.             }
  322.             // relese the rest of the packet fragments
  323.             tmp_packet = pq_next( next_packet );
  324.             while( tmp_packet ){
  325.                 next_packet = pq_detach( tmp_packet );
  326.                 pq_release( udp_globals.net_phone, packet_get_id( tmp_packet ));
  327.                 tmp_packet = next_packet;
  328.             }
  329.             break;
  330.         }
  331.         total_length -= length;
  332.     /*  if( header->header_checksum ){
  333.         }
  334.     */
  335.     }while(( next_packet = pq_next( next_packet )) && ( total_length > 0 ));
  336.     // queue the received packet
  337.     if( ERROR_OCCURRED( dyn_fifo_push( &( ** socket ).received, packet_get_id( packet ), SOCKET_MAX_RECEIVED_SIZE ))){
  338.         return udp_release_and_return( packet, ERROR_CODE );
  339.     }
  340.  
  341.     // notify the destination socket
  342.     async_msg_2(( ** socket ).phone, NET_SOCKET_RECEIVED, ( ipcarg_t ) ( ** socket ).socket_id, ( ipcarg_t ) fragments );
  343.     return EOK;
  344. }
  345.  
  346. int udp_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
  347.     ERROR_DECLARE;
  348.  
  349.     packet_t    packet;
  350.  
  351.     * answer_count = 0;
  352.     switch( IPC_GET_METHOD( * call )){
  353.         case NET_TL_RECEIVED:
  354.             fibril_rwlock_read_lock( & udp_globals.lock );
  355.             if( ! ERROR_OCCURRED( packet_translate( udp_globals.net_phone, & packet, IPC_GET_PACKET( call )))){
  356.                 ERROR_CODE = udp_received_msg( IPC_GET_DEVICE( call ), packet, SERVICE_UDP, IPC_GET_ERROR( call ));
  357.             }
  358.             fibril_rwlock_read_unlock( & udp_globals.lock );
  359.             return ERROR_CODE;
  360.         case IPC_M_CONNECT_TO_ME:
  361.             return udp_process_client_messages( callid, * call );
  362.     }
  363.     return ENOTSUP;
  364. }
  365.  
  366. int udp_process_client_messages( ipc_callid_t callid, ipc_call_t call ){
  367.     int                     res;
  368.     bool                    keep_on_going = true;
  369.     socket_cores_t          local_sockets;
  370.     int                     app_phone = IPC_GET_PHONE( & call );
  371.     struct sockaddr *       addr;
  372.     size_t                  addrlen;
  373.     fibril_rwlock_t         lock;
  374.     ipc_call_t              answer;
  375.     int                     answer_count;
  376.  
  377.     /*
  378.      * Accept the connection
  379.      *  - Answer the first IPC_M_CONNECT_ME_TO call.
  380.      */
  381.     ipc_answer_0( callid, EOK );
  382.  
  383.     socket_cores_initialize( & local_sockets );
  384.     fibril_rwlock_initialize( & lock );
  385.  
  386.     while( keep_on_going ){
  387.         // refresh data
  388.         refresh_answer( & answer, & answer_count );
  389.  
  390.         callid = async_get_call( & call );
  391. //      printf( "message %d\n", IPC_GET_METHOD( * call ));
  392.  
  393.         switch( IPC_GET_METHOD( call )){
  394.             case IPC_M_PHONE_HUNGUP:
  395.                 keep_on_going = false;
  396.                 res = EOK;
  397.                 break;
  398.             case NET_SOCKET:
  399.                 fibril_rwlock_write_lock( & lock );
  400.                 res = socket_create( & local_sockets, app_phone, SOCKET_SET_SOCKET_ID( answer ));
  401.                 fibril_rwlock_write_unlock( & lock );
  402.                 * SOCKET_SET_HEADER_SIZE( answer ) = sizeof( udp_header_t );
  403.                 * SOCKET_SET_DATA_FRAGMENT_SIZE( answer ) = MAX_UDP_FRAGMENT_SIZE;
  404.                 answer_count = 3;
  405.                 break;
  406.             case NET_SOCKET_BIND:
  407.                 res = socket_read_data(( void ** ) & addr, & addrlen );
  408.                 if( res == EOK ){
  409.                     fibril_rwlock_write_lock( & lock );
  410.                     fibril_rwlock_write_lock( & udp_globals.lock );
  411.                     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 );
  412.                     fibril_rwlock_write_unlock( & udp_globals.lock );
  413.                     fibril_rwlock_write_unlock( & lock );
  414.                     free( addr );
  415.                 }
  416.                 break;
  417.             case NET_SOCKET_SENDTO:
  418.                 res = socket_read_data(( void ** ) & addr, & addrlen );
  419.                 if( res == EOK ){
  420.                     fibril_rwlock_read_lock( & lock );
  421.                     fibril_rwlock_read_lock( & udp_globals.lock );
  422.                     res = udp_sendto_message( & local_sockets, SOCKET_GET_SOCKET_ID( call ), addr, addrlen, SOCKET_GET_DATA_FRAGMENTS( call ), SOCKET_GET_FLAGS( call ));
  423.                     fibril_rwlock_read_unlock( & udp_globals.lock );
  424.                     fibril_rwlock_read_unlock( & lock );
  425.                     free( addr );
  426.                 }
  427.                 break;
  428.             case NET_SOCKET_RECVFROM:
  429.                 fibril_rwlock_read_lock( & lock );
  430.                 fibril_rwlock_read_lock( & udp_globals.lock );
  431.                 res = udp_recvfrom_message( & local_sockets, SOCKET_GET_SOCKET_ID( call ), SOCKET_GET_FLAGS( call ), & addrlen );
  432.                 fibril_rwlock_read_unlock( & udp_globals.lock );
  433.                 fibril_rwlock_read_unlock( & lock );
  434.                 if( res > 0 ){
  435.                     * SOCKET_SET_READ_DATA_LENGTH( answer ) = res;
  436.                     * SOCKET_SET_ADDRESS_LENGTH( answer ) = addrlen;
  437.                     answer_count = 2;
  438.                     res = EOK;
  439.                 }
  440.                 break;
  441.             case NET_SOCKET_CLOSE:
  442.                 fibril_rwlock_write_lock( & lock );
  443.                 fibril_rwlock_write_lock( & udp_globals.lock );
  444.                 res = socket_destroy( udp_globals.net_phone, SOCKET_GET_SOCKET_ID( call ), & local_sockets, & udp_globals.sockets );
  445.                 fibril_rwlock_write_unlock( & udp_globals.lock );
  446.                 fibril_rwlock_write_unlock( & lock );
  447.                 break;
  448.             case NET_SOCKET_GETSOCKOPT:
  449.             case NET_SOCKET_SETSOCKOPT:
  450.             default:
  451.                 res = ENOTSUP;
  452.                 break;
  453.         }
  454.  
  455. //      printf( "res = %d\n", res );
  456.  
  457.         answer_call( callid, res, & answer, answer_count );
  458.     }
  459.  
  460.     socket_cores_destroy( & local_sockets );
  461.  
  462.     return EOK;
  463. }
  464.  
  465. int udp_sendto_message( socket_cores_ref local_sockets, int socket_id, const struct sockaddr * addr, socklen_t addrlen, int fragments, int flags ){
  466.     ERROR_DECLARE;
  467.  
  468.     socket_core_ref         socket;
  469.     struct sockaddr_in *    address_in;
  470.     struct sockaddr_in6 *   address_in6;
  471.     packet_t                packet;
  472.     packet_t                next_packet;
  473.     udp_header_ref          header;
  474.     int                     index;
  475.     size_t                  total_length;
  476.     int                     result;
  477.     uint16_t                dest_port;
  478.  
  479.     if( addrlen < sizeof( struct sockaddr )) return EINVAL;
  480.     switch( addr->sa_family ){
  481.         case AF_INET:
  482.             if( addrlen != sizeof( struct sockaddr_in )) return EINVAL;
  483.             address_in = ( struct sockaddr_in * ) addr;
  484.             dest_port = address_in->sin_port;
  485.             break;
  486.         case AF_INET6:
  487.             if( addrlen != sizeof( struct sockaddr_in6 )) return EINVAL;
  488.             address_in6 = ( struct sockaddr_in6 * ) addr;
  489.             dest_port = address_in6->sin6_port;
  490.             break;
  491.         default:
  492.             return EAFNOSUPPORT;
  493.     }
  494.  
  495.     socket = socket_cores_find( local_sockets, socket_id );
  496.     if( ! socket ) return ENOTSOCK;
  497.  
  498.     // bind the socket to a random free port if not bound
  499.     while( socket->port <= 0 ){
  500.         // try to find a free port
  501.         fibril_rwlock_read_unlock( & udp_globals.lock );
  502.         fibril_rwlock_write_lock( & udp_globals.lock );
  503.         if( socket->port <= 0 ){
  504.             ERROR_PROPAGATE( socket_bind_free_port( & udp_globals.sockets, socket, UDP_FREE_PORTS_START, UDP_FREE_PORTS_END, udp_globals.last_used_port ));
  505.             // set the next port as the search starting port number
  506.             udp_globals.last_used_port = socket->port;
  507.         }
  508.         fibril_rwlock_write_unlock( & udp_globals.lock );
  509.         fibril_rwlock_read_lock( & udp_globals.lock );
  510.     }
  511.  
  512.     // TODO do not ask all the time
  513.     ERROR_PROPAGATE( ip_packet_size_req( udp_globals.ip_phone, -1, & udp_globals.addr_len, & udp_globals.prefix, & udp_globals.content, & udp_globals.suffix ));
  514.  
  515.     // read the first packet fragment
  516.     result = socket_read_packet_data( & packet, sizeof( udp_header_t ), addr, addrlen );
  517.     if( result < 0 ) return result;
  518.     total_length = ( size_t ) result;
  519.     // prefix the udp header
  520.     header = PACKET_PREFIX( packet, udp_header_t );
  521.     if( ! header ){
  522.         pq_release( udp_globals.net_phone, packet_get_id( packet ));
  523.         return ENOMEM;
  524.     }
  525.     // read the rest of the packet fragments
  526.     for( index = 1; index < fragments; ++ index ){
  527.         result = socket_read_packet_data( & next_packet, 0, addr, addrlen );
  528.         if( result < 0 ){
  529.             return udp_release_and_return( packet, result );
  530.         }
  531.         packet = pq_add( packet, next_packet, index, 0 );
  532.         total_length += ( size_t ) result;
  533.     }
  534.     // set the udp header
  535.     header->source = htons( socket->port );
  536.     header->dest = htons( dest_port );
  537.     header->len = htons( total_length + sizeof( udp_header_t ));
  538.     // TODO my ip address for the pseudo header checksum
  539.     header->check = 0;
  540.     // prepare the first packet fragment
  541.     if( ERROR_OCCURRED( ip_client_prepare_packet( packet, IPPROTO_UDP, 0, 0, 0, 0 ))){
  542.         pq_release( udp_globals.net_phone, packet_get_id( packet ));
  543.         return ERROR_CODE;
  544.     }
  545.     // send the packet
  546.     return ip_send_msg( udp_globals.ip_phone, socket->device_id, packet, SERVICE_UDP, 0 );
  547. }
  548.  
  549. int udp_recvfrom_message( socket_cores_ref local_sockets, int socket_id, int flags, size_t * addrlen ){
  550.     ERROR_DECLARE;
  551.  
  552.     socket_core_ref socket;
  553.     int             packet_id;
  554.     packet_t        packet;
  555.     udp_header_ref  header;
  556.     struct sockaddr *   addr;
  557.     size_t          length;
  558.     packet_t        next_packet;
  559.     uint8_t *       data;
  560.     size_t          fragments;
  561.     size_t *        lengths;
  562.     size_t          index;
  563.     int             result;
  564.  
  565.     // find the socket
  566.     socket = socket_cores_find( local_sockets, socket_id );
  567.     if( ! socket ) return ENOTSOCK;
  568.     // get the next received packet
  569.     packet_id = dyn_fifo_value( & socket->received );
  570.     if( packet_id < 0 ) return NO_DATA;
  571.     ERROR_PROPAGATE( packet_translate( udp_globals.net_phone, & packet, packet_id ));
  572.     // get udp header
  573.     data = packet_get_data( packet );
  574.     if( ! data ){
  575.         pq_release( udp_globals.net_phone, packet_id );
  576.         return NO_DATA;
  577.     }
  578.     header = ( udp_header_ref ) data;
  579.  
  580.     // set the source address port
  581.     result = packet_get_addr( packet, ( uint8_t ** ) & addr, NULL );
  582.     if( ERROR_OCCURRED( udp_set_address_port( addr, result, ntohs( header->source )))){
  583.         pq_release( udp_globals.net_phone, packet_id );
  584.         return ERROR_CODE;
  585.     }
  586.     * addrlen = ( size_t ) result;
  587.     // send the source address
  588.     ERROR_PROPAGATE( socket_write_data( addr, * addrlen ));
  589.  
  590.     next_packet = pq_next( packet );
  591.     if( ! next_packet ){
  592.         // write all if only one fragment
  593.         ERROR_PROPAGATE( socket_write_data( data + sizeof( udp_header_t ), packet_get_data_length( packet ) - sizeof( udp_header_t )));
  594.         // store the total length
  595.         length = packet_get_data_length( packet ) - sizeof( udp_header_t );
  596.     }else{
  597.         // count the packet fragments
  598.         fragments = 1;
  599.         next_packet = pq_next( packet );
  600.         while(( next_packet = pq_next( next_packet ))){
  601.             ++ fragments;
  602.         }
  603.         // compute and store the fragment lengths
  604.         lengths = ( size_t * ) malloc( sizeof( size_t ) * fragments + sizeof( size_t ));
  605.         if( ! lengths ) return ENOMEM;
  606.         lengths[ 0 ] = packet_get_data_length( packet ) - sizeof( udp_header_t );
  607.         lengths[ fragments ] = lengths[ 0 ];
  608.         next_packet = pq_next( packet );
  609.         for( index = 1; index < fragments; ++ index ){
  610.             lengths[ index ] = packet_get_data_length( next_packet );
  611.             lengths[ fragments ] += lengths[ index ];
  612.             next_packet = pq_next( packet );
  613.         }while( next_packet );
  614.         // write the fragment lengths
  615.         ERROR_PROPAGATE( socket_write_data( lengths, sizeof( int ) * ( fragments + 1 )));
  616.         // write the first fragment
  617.         ERROR_PROPAGATE( socket_write_data( data + sizeof( udp_header_t ), lengths[ 0 ] ));
  618.         next_packet = pq_next( packet );
  619.         // write the rest of the fragments
  620.         for( index = 1; index < fragments; ++ index ){
  621.             ERROR_PROPAGATE( socket_write_data( packet_get_data( next_packet ), lengths[ index ] ));
  622.             next_packet = pq_next( packet );
  623.         }while( next_packet );
  624.         // store the total length
  625.         length = lengths[ fragments ];
  626.         free( lengths );
  627.     }
  628.     // release the packet
  629.     dyn_fifo_pop( & socket->received );
  630.     pq_release( udp_globals.net_phone, packet_get_id( packet ));
  631.     // return the total length
  632.     return ( int ) length;
  633. }
  634.  
  635. int socket_write_data( void * data, size_t data_length ){
  636.     size_t          length;
  637.     ipc_callid_t    callid;
  638.  
  639.     if(( ! ipc_data_read_receive( & callid, & length ))
  640.     || ( length < data_length )){
  641.         return EINVAL;
  642.     }
  643.     return ipc_data_read_finalize( callid, data, data_length );
  644. }
  645.  
  646. int socket_read_data( void ** data, size_t * length ){
  647.     ERROR_DECLARE;
  648.  
  649.     ipc_callid_t    callid;
  650.  
  651.     if( !( data && length )) return EBADMEM;
  652.     if( ! ipc_data_write_receive( & callid, length )) return EINVAL;
  653.     * data = malloc( * length );
  654.     if( !( * data )) return ENOMEM;
  655.     if( ERROR_OCCURRED( ipc_data_write_finalize( callid, * data, * length ))){
  656.         free( data );
  657.         return ERROR_CODE;
  658.     }
  659.     return EOK;
  660. }
  661.  
  662. int socket_read_packet_data( packet_ref packet, size_t prefix, const struct sockaddr * addr, socklen_t addrlen ){
  663.     ERROR_DECLARE;
  664.  
  665.     ipc_callid_t    callid;
  666.     size_t          length;
  667.     void *          data;
  668.  
  669.     // get the data length
  670.     if( ! ipc_data_write_receive( & callid, & length )) return EINVAL;
  671.     // get a new packet
  672.     * packet = packet_get_4( udp_globals.net_phone, length, udp_globals.addr_len, prefix + udp_globals.prefix, udp_globals.suffix );
  673.     if( ! packet ) return ENOMEM;
  674.     // allocate space in the packet
  675.     data = packet_suffix( * packet, length );
  676.     if( ! data ){
  677.         pq_release( udp_globals.net_phone, packet_get_id( * packet ));
  678.         return ENOMEM;
  679.     }
  680.     // read the data into the packet
  681.     if( ERROR_OCCURRED( ipc_data_write_finalize( callid, data, length ))
  682.     // set the packet destination address
  683.     || ERROR_OCCURRED( packet_set_addr( * packet, NULL, ( uint8_t * ) addr, addrlen ))){
  684.         pq_release( udp_globals.net_phone, packet_get_id( * packet ));
  685.         return ERROR_CODE;
  686.     }
  687.     return ( int ) length;
  688. }
  689.  
  690. int udp_release_and_return( packet_t packet, int result ){
  691.     pq_release( udp_globals.net_phone, packet_get_id( packet ));
  692.     return result;
  693. }
  694.  
  695. void udp_send_icmp_port_unreachable( packet_t packet, services_t error ){
  696.     packet_t    next;
  697.     uint8_t *   src;
  698.     int         length;
  699.  
  700.     // detach the first packet and release the others
  701.     next = pq_detach( packet );
  702.     if( next ){
  703.         pq_release( udp_globals.net_phone, packet_get_id( next ));
  704.     }
  705.     length = packet_get_addr( packet, & src, NULL );
  706.     if(( length > 0 )
  707.     && ( ! error )
  708.     && ( udp_globals.icmp_phone >= 0 )
  709.     // set both addresses to the source one (avoids the source address deletion before setting the destination one)
  710.     && ( packet_set_addr( packet, src, src, ( size_t ) length ) == EOK )){
  711.         icmp_destination_unreachable_msg( udp_globals.icmp_phone, ICMP_PORT_UNREACH, 0, packet );
  712.     }else{
  713.         udp_release_and_return( packet, EINVAL );
  714.     }
  715. }
  716.  
  717. int udp_set_address_port( struct sockaddr * addr, int addrlen, uint16_t port ){
  718.     struct sockaddr_in *    address_in;
  719.     struct sockaddr_in6 *   address_in6;
  720.     size_t                  length;
  721.  
  722.     if( addrlen < 0 ) return EINVAL;
  723.     length = ( size_t ) addrlen;
  724.     if( length < sizeof( struct sockaddr )) return EINVAL;
  725.     switch( addr->sa_family ){
  726.         case AF_INET:
  727.             if( length != sizeof( struct sockaddr_in )) return EINVAL;
  728.             address_in = ( struct sockaddr_in * ) addr;
  729.             address_in->sin_port = port;
  730.             return EOK;
  731.         case AF_INET6:
  732.             if( length != sizeof( struct sockaddr_in6 )) return EINVAL;
  733.             address_in6 = ( struct sockaddr_in6 * ) addr;
  734.             address_in6->sin6_port = port;
  735.             return EOK;
  736.         default:
  737.             return EAFNOSUPPORT;
  738.     }
  739. }
  740.  
  741. /** @}
  742.  */
  743.