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  1. /*
  2.  * Copyright (c) 2009 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 arp
  30.  *  @{
  31.  */
  32.  
  33. /** @file
  34.  *  ARP module implementation.
  35.  *  @see arp.h
  36.  */
  37.  
  38. #include <async.h>
  39. #include <malloc.h>
  40. #include <mem.h>
  41. #include <rwlock.h>
  42. #include <stdio.h>
  43.  
  44. #include <ipc/ipc.h>
  45. #include <ipc/services.h>
  46.  
  47. #include "../../err.h"
  48. #include "../../messages.h"
  49. #include "../../modules.h"
  50.  
  51. #include "../../include/protocol_map.h"
  52. #include "../../netif/device.h"
  53.  
  54. #include "../../structures/measured_strings.h"
  55. #include "../../structures/packet/packet.h"
  56. #include "../../structures/packet/packet_client.h"
  57.  
  58. #include "arp.h"
  59. #include "arp_header.h"
  60. #include "arp_oc.h"
  61. //#include "arp_messages.h"
  62. #include "arp_module.h"
  63.  
  64. /** Returns the device identifier message parameter.
  65.  */
  66. #define IPC_GET_DEVICE( call )      ( device_id_t ) IPC_GET_ARG1( * call )
  67.  
  68. /** Returns the packet identifier message parameter.
  69.  */
  70. #define IPC_GET_PACKET( call )      ( packet_id_t ) IPC_GET_ARG2( * call )
  71.  
  72. /** Returns the protocol service message parameter.
  73.  */
  74. #define IPC_GET_PROTO( call )       ( services_t ) IPC_GET_ARG2( * call )
  75.  
  76. /** Returns the device driver service message parameter.
  77.  */
  78. #define IPC_GET_SERVICE( call )     ( services_t ) IPC_GET_ARG3( * call )
  79.  
  80. /** ARP global data.
  81.  */
  82. arp_globals_t   arp_globals;
  83.  
  84. /** Creates new protocol specific data.
  85.  *  @param proto Protocol specific data. Output parameter.
  86.  *  @param service Protocol module service. Input parameter.
  87.  *  @param address Actual protocol device address. Input parameter.
  88.  *  @returns EOK on success.
  89.  *  @returns ENOMEM if there is not enough memory left.
  90.  */
  91. int arp_proto_create( arp_proto_ref * proto, services_t service, measured_string_ref address );
  92.  
  93. /** Registers the device.
  94.  *  Creates new device entry in the cache or updates the protocol address if the device with the device identifier and the driver service exists.
  95.  *  @param device_id The device identifier. Input parameter.
  96.  *  @param service The device driver service. Input parameter.
  97.  *  @param protocol The protocol service. Input parameter.
  98.  *  @param address The actual device protocol address.
  99.  *  @returns EOK on success.
  100.  *  @returns EEXIST if another device with the same device identifier and different driver service exists.
  101.  *  @returns ENOMEM if there is not enough memory left.
  102.  *  @returns Other error codes as defined for the measured_strings_return() function.
  103.  */
  104. int arp_device_message( device_id_t device_id, services_t service, services_t protocol, measured_string_ref address );
  105.  
  106. /** Returns the hardware address for the given protocol address.
  107.  *  Sends the ARP request packet if the hardware address is not found in the cache.
  108.  *  @param device_id The device identifier. Input parameter.
  109.  *  @param protocol The protocol service. Input parameter.
  110.  *  @param target The target protocol address. Input parameter.
  111.  *  @returns The hardware address of the target.
  112.  *  @returns NULL if the target parameter is NULL.
  113.  *  @returns NULL if the device is not found.
  114.  *  @returns NULL if the device packet is too small to send a&nbsp;request.
  115.  *  @returns NULL if the hardware address is not found in the cache.
  116.  */
  117. measured_string_ref arp_translate_message( device_id_t device_id, services_t protocol, measured_string_ref target );
  118.  
  119. /** Processes the received ARP packet.
  120.  *  Updates the source hardware address if the source entry exists or the packet is targeted to my protocol address.
  121.  *  Responses to the ARP request if the packet is the ARP request and is targeted to my address.
  122.  *  @param device_id The source device identifier. Input parameter.
  123.  *  @param packet The received packet. Input/output parameter.
  124.  *  @returns EOK on success.
  125.  *  @returns EINVAL if the packet is too small to carry the ARP packet.
  126.  *  @returns EINVAL if the received address lengths differs from the registered values.
  127.  *  @returns ENOENT if the device is not found in the cache.
  128.  *  @returns ENOENT if the protocol for the device is not found in the cache.
  129.  *  @returns ENOMEM if there is not enough memory left.
  130.  */
  131. int arp_receive_message( device_id_t device_id, packet_t packet );
  132.  
  133. /** Clears the device specific data from the cache.
  134.  *  @param device_id The device identifier. Input parameter.
  135.  *  @returns EOK on success.
  136.  *  @returns ENOENT  if the device is not found in the cache.
  137.  */
  138. int arp_clear_device_message( device_id_t device_id );
  139.  
  140. /** Clears the device specific data.
  141.  *  @param device The device specific data.
  142.  */
  143. void    clear_device( arp_device_ref device );
  144.  
  145. /** Clears the whole cache.
  146.  *  @returns EOK on success.
  147.  */
  148. int arp_clean_cache_message( void );
  149.  
  150. /** Processes IPC messages from the registered device driver modules in an infinite loop.
  151.  *  @param iid The message identifier. Input parameter.
  152.  *  @param icall The message parameters. Input/output parameter.
  153.  */
  154. void    arp_receiver( ipc_callid_t iid, ipc_call_t * icall );
  155.  
  156. DEVICE_MAP_IMPLEMENT( arp_cache, arp_device_t )
  157.  
  158. INT_MAP_IMPLEMENT( arp_protos, arp_proto_t )
  159.  
  160. GENERIC_CHAR_MAP_IMPLEMENT( arp_addr, measured_string_t )
  161.  
  162. int arp_initialize( void ){
  163.     ERROR_DECLARE;
  164.  
  165.     rwlock_initialize( & arp_globals.lock );
  166.     rwlock_write_lock( & arp_globals.lock );
  167.     ERROR_PROPAGATE( arp_cache_initialize( & arp_globals.cache ));
  168.     rwlock_write_unlock( & arp_globals.lock );
  169.     return EOK;
  170. }
  171.  
  172. int arp_proto_create( arp_proto_ref * proto, services_t service, measured_string_ref address ){
  173.     ERROR_DECLARE;
  174.  
  175.     * proto = ( arp_proto_ref ) malloc( sizeof( arp_proto_t ));
  176.     if( !( * proto )) return ENOMEM;
  177.     ( ** proto ).service = service;
  178.     ( ** proto ).addr = address;
  179.     ( ** proto ).addr_data = address->value;
  180.     if( ERROR_OCCURRED( arp_addr_initialize( &( ** proto).addresses ))){
  181.         free( * proto );
  182.         return ERROR_CODE;
  183.     }
  184.     return EOK;
  185. }
  186.  
  187. int arp_device_message( device_id_t device_id, services_t service, services_t protocol, measured_string_ref address ){
  188.     ERROR_DECLARE;
  189.  
  190.     arp_device_ref  device;
  191.     aid_t           message;
  192.     ipc_call_t      answer;
  193.     ipcarg_t        result;
  194.     arp_proto_ref   proto;
  195.     int             index;
  196.  
  197.     rwlock_write_lock( & arp_globals.lock );
  198.     // an existing device?
  199.     device = arp_cache_find( & arp_globals.cache, device_id );
  200.     if( device ){
  201.         if( device->service != service ){
  202.             printf( "\nDevice %d already exists", device->device_id );
  203.             rwlock_write_unlock( & arp_globals.lock );
  204.             return EEXIST;
  205.         }
  206.         proto = arp_protos_find( & device->protos, protocol );
  207.         if( proto ){
  208.             free( proto->addr );
  209.             free( proto->addr_data );
  210.             proto->addr = address;
  211.             proto->addr_data = address->value;
  212.         }else{
  213.             if( ERROR_OCCURRED( arp_proto_create( & proto, protocol, address ))){
  214.                 rwlock_write_unlock( & arp_globals.lock );
  215.                 return ERROR_CODE;
  216.             }
  217.             index = arp_protos_add( & device->protos, proto->service, proto );
  218.             if( index < 0 ){
  219.                 rwlock_write_unlock( & arp_globals.lock );
  220.                 free( proto );
  221.                 return result;
  222.             }
  223.         }
  224.         printf( "\nCache of the existing device %d cleaned", device->device_id );
  225.     }else{
  226.         index = protocol_map( service, protocol );
  227.         if( ! index ) return ENOENT;
  228.         // create a new device
  229.         device = ( arp_device_ref ) malloc( sizeof( arp_device_t ));
  230.         if( ! device ){
  231.             rwlock_write_unlock( & arp_globals.lock );
  232.             return ENOMEM;
  233.         }
  234.         device->hardware = index;
  235.         device->device_id = device_id;
  236.         if( ERROR_OCCURRED( arp_protos_initialize( & device->protos ))
  237.         || ERROR_OCCURRED( arp_proto_create( & proto, protocol, address ))){
  238.             rwlock_write_unlock( & arp_globals.lock );
  239.             free( device );
  240.             return ERROR_CODE;
  241.         }
  242.         index = arp_protos_add( & device->protos, proto->service, proto );
  243.         if( index < 0 ){
  244.             rwlock_write_unlock( & arp_globals.lock );
  245.             arp_protos_destroy( & device->protos );
  246.             free( device );
  247.             return index;
  248.         }
  249.         device->service = service;
  250.         // bind the new one
  251.         device->phone = bind_service( device->service, device->device_id, SERVICE_ARP, 0, arp_receiver );
  252.         if( device->phone < 0 ){
  253.             rwlock_write_unlock( & arp_globals.lock );
  254.             arp_protos_destroy( & device->protos );
  255.             free( device );
  256.             return EREFUSED;
  257.         }
  258.         // get packet dimensions
  259.         if( ERROR_OCCURRED( async_req_1_4( device->phone, NET_NIL_PACKET_SPACE, device_id, & device->addr_len, & device->prefix, & device->content, & device->suffix ))){
  260.             rwlock_write_unlock( & arp_globals.lock );
  261.             arp_protos_destroy( & device->protos );
  262.             free( device );
  263.             return ERROR_CODE;
  264.         }
  265.         // get hardware address
  266.         message = async_send_1( device->phone, NET_NIL_ADDR, device->device_id, & answer );
  267.         if( ERROR_OCCURRED( measured_strings_return( device->phone, & device->addr, & device->addr_data, 1 ))){
  268.             rwlock_write_unlock( & arp_globals.lock );
  269.             arp_protos_destroy( & device->protos );
  270.             free( device );
  271.             async_wait_for( message, NULL );
  272.             return ERROR_CODE;
  273.         }
  274.         async_wait_for( message, & result );
  275.         if( ERROR_OCCURRED( result )){
  276.             rwlock_write_unlock( & arp_globals.lock );
  277.             free( device->addr );
  278.             free( device->addr_data );
  279.             arp_protos_destroy( & device->protos );
  280.             free( device );
  281.             return ERROR_CODE;
  282.         }
  283.         // get broadcast address
  284.         message = async_send_1( device->phone, NET_NIL_BROADCAST_ADDR, device->device_id, & answer );
  285.         if( ERROR_OCCURRED( measured_strings_return( device->phone, & device->broadcast_addr, & device->broadcast_data, 1 ))){
  286.             rwlock_write_unlock( & arp_globals.lock );
  287.             free( device->addr );
  288.             free( device->addr_data );
  289.             arp_protos_destroy( & device->protos );
  290.             free( device );
  291.             async_wait_for( message, NULL );
  292.             return ERROR_CODE;
  293.         }
  294.         async_wait_for( message, & result );
  295.         // add to the cache
  296.         if( ERROR_OCCURRED( result )
  297.         || ERROR_OCCURRED( arp_cache_add( & arp_globals.cache, device->device_id, device ))){
  298.             rwlock_write_unlock( & arp_globals.lock );
  299.             free( device->addr );
  300.             free( device->addr_data );
  301.             free( device->broadcast_addr );
  302.             free( device->broadcast_data );
  303.             arp_protos_destroy( & device->protos );
  304.             free( device );
  305.             return ERROR_CODE;
  306.         }
  307.         printf( "\nNew device registered:\n\tid\t= %d\n\ttype\t= 0x%x\n\tservice\t= %d", device->device_id, device->hardware, device->service );
  308.     }
  309.     rwlock_write_unlock( & arp_globals.lock );
  310.     return EOK;
  311. }
  312.  
  313. measured_string_ref arp_translate_message( device_id_t device_id, services_t protocol, measured_string_ref target ){
  314.     arp_device_ref      device;
  315.     arp_proto_ref       proto;
  316.     measured_string_ref addr;
  317.     size_t              length;
  318.     packet_t            packet;
  319.     arp_header_ref      header;
  320.  
  321.     if( ! target ) return NULL;
  322.     rwlock_read_lock( & arp_globals.lock );
  323.     device = arp_cache_find( & arp_globals.cache, device_id );
  324.     if( ! device ){
  325.         rwlock_read_unlock( & arp_globals.lock );
  326.         return NULL;
  327.     }
  328.     proto = arp_protos_find( & device->protos, protocol );
  329.     if(( ! proto ) || ( proto->addr->length != target->length )){
  330.         rwlock_read_unlock( & arp_globals.lock );
  331.         return NULL;
  332.     }
  333.     addr = arp_addr_find( & proto->addresses, target->value, target->length );
  334.     if( addr ){
  335.         rwlock_read_unlock( & arp_globals.lock );
  336.         return addr;
  337.     }
  338.     // ARP packet content size = header + ( address + translation ) * 2
  339.     length = 8 + ( CONVERT_SIZE( char, uint8_t, proto->addr->length ) + CONVERT_SIZE( char, uint8_t, device->addr->length )) * 2;
  340.     if( length > device->content ){
  341.         rwlock_read_unlock( & arp_globals.lock );
  342.         return NULL;
  343.     }
  344.     packet = packet_get_4( arp_globals.networking_phone, device->addr_len, device->prefix, length, device->suffix );
  345.     if( ! packet ){
  346.         rwlock_read_unlock( & arp_globals.lock );
  347.         return NULL;
  348.     }
  349.     header = ( arp_header_ref ) packet_suffix( packet, length );
  350.     header->hardware = device->hardware;
  351.     header->hardware_length = device->addr->length;
  352.     header->protocol = protocol_map( device->service, protocol );
  353.     header->protocol_length = proto->addr->length;
  354.     header->operation = ARPOP_REQUEST;
  355.     length = sizeof( arp_header_t );
  356.     memcpy((( uint8_t * ) header ) + length, device->addr->value, device->addr->length );
  357.     length += device->addr->length;
  358.     memcpy((( uint8_t * ) header ) + length, proto->addr->value, proto->addr->length );
  359.     length += proto->addr->length;
  360.     bzero((( uint8_t * ) header ) + length, device->addr->length );
  361.     length += device->addr->length;
  362.     memcpy((( uint8_t * ) header ) + length, target->value, target->length );
  363.     packet_set_addr( packet, ( uint8_t * ) device->addr->value, ( uint8_t * ) device->broadcast_addr->value, CONVERT_SIZE( char, uint8_t, device->addr->length ));
  364.     async_msg_3( device->phone, NET_NETIF_SEND, device_id, SERVICE_ARP, packet_get_id( packet ));
  365.     rwlock_read_unlock( & arp_globals.lock );
  366.     return NULL;
  367. }
  368.  
  369. int arp_receive_message( device_id_t device_id, packet_t packet ){
  370.     ERROR_DECLARE;
  371.  
  372.     size_t              length;
  373.     arp_header_ref      header;
  374.     arp_device_ref      device;
  375.     arp_proto_ref       proto;
  376.     measured_string_ref hw_source;
  377.     uint8_t *           src_hw;
  378.     uint8_t *           src_proto;
  379.     uint8_t *           des_hw;
  380.     uint8_t *           des_proto;
  381.  
  382.     length = packet_get_data_length( packet );
  383.     if( length <= sizeof( arp_header_t )) return EINVAL;
  384.     rwlock_read_lock( & arp_globals.lock );
  385.     device = arp_cache_find( & arp_globals.cache, device_id );
  386.     if( ! device ){
  387.         rwlock_read_unlock( & arp_globals.lock );
  388.         return ENOENT;
  389.     }
  390.     header = ( arp_header_ref ) packet_get_data( packet );
  391.     if(( header->hardware != device->hardware )
  392.     || ( length < sizeof( arp_header_t ) + ( header->hardware_length + header->protocol_length ) * 2 )){
  393.         rwlock_read_unlock( & arp_globals.lock );
  394.         return EINVAL;
  395.     }
  396.     proto = arp_protos_find( & device->protos, protocol_unmap( device->service, header->protocol ));
  397.     if( ! proto ){
  398.         rwlock_read_unlock( & arp_globals.lock );
  399.         return ENOENT;
  400.     }
  401.     src_hw = (( uint8_t * ) header ) + sizeof( arp_header_t );
  402.     src_proto = src_hw + header->hardware_length;
  403.     des_hw = src_proto + header->protocol_length;
  404.     des_proto = des_hw + header->hardware_length;
  405.     hw_source = arp_addr_find( & proto->addresses, ( char * ) src_proto, CONVERT_SIZE( uint8_t, char, header->protocol_length ));
  406.     // exists?
  407.     if( hw_source ){
  408.         if( hw_source->length != CONVERT_SIZE( uint8_t, char, header->hardware_length )){
  409.             rwlock_read_unlock( & arp_globals.lock );
  410.             return EINVAL;
  411.         }
  412.         memcpy( hw_source->value, src_hw, hw_source->length );
  413.     }
  414.     // is my protocol address?
  415.     if( proto->addr->length != CONVERT_SIZE( uint8_t, char, header->hardware_length )){
  416.         rwlock_read_unlock( & arp_globals.lock );
  417.         return EINVAL;
  418.     }
  419.     if( ! strncmp( proto->addr->value, ( char * ) des_proto, proto->addr->length )){
  420.         // not already upadted?
  421.         if( ! hw_source ){
  422.             hw_source = measured_string_create_bulk(( char * ) src_hw, CONVERT_SIZE( uint8_t, char, header->hardware_length ));
  423.             if( ! hw_source ){
  424.                 rwlock_read_unlock( & arp_globals.lock );
  425.                 return ENOMEM;
  426.             }
  427.             if( ERROR_OCCURRED( arp_addr_add( & proto->addresses, ( char * ) src_proto, CONVERT_SIZE( uint8_t, char, header->protocol_length ), hw_source ))){
  428.                 rwlock_read_unlock( & arp_globals.lock );
  429.                 return ERROR_CODE;
  430.             }
  431.         }
  432.         if( header->operation == ARPOP_REQUEST ){
  433.             header->operation = ARPOP_REPLY;
  434.             memcpy( des_proto, src_proto, header->protocol_length );
  435.             memcpy( src_proto, proto->addr->value, header->protocol_length );
  436.             memcpy( src_hw, des_hw, header->hardware_length );
  437.             memcpy( des_hw, hw_source->value, header->hardware_length );
  438.             packet_set_addr( packet, src_hw, des_hw, header->hardware_length );
  439.             async_msg_3( device->phone, NET_NETIF_SEND, device_id, SERVICE_ARP, packet_get_id( packet ));
  440.             rwlock_read_unlock( & arp_globals.lock );
  441.         }else{
  442.             rwlock_read_unlock( & arp_globals.lock );
  443.             pq_release( arp_globals.networking_phone, packet_get_id( packet ));
  444.         }
  445.     }
  446.     return EOK;
  447. }
  448.  
  449. int arp_clear_device_message( device_id_t device_id ){
  450.     arp_device_ref  device;
  451.  
  452.     rwlock_write_lock( & arp_globals.lock );
  453.     device = arp_cache_find( & arp_globals.cache, device_id );
  454.     if( ! device ){
  455.         rwlock_write_unlock( & arp_globals.lock );
  456.         return ENOENT;
  457.     }
  458.     clear_device( device );
  459.     printf( "\nDevice %d cleared", device_id );
  460.     rwlock_write_unlock( & arp_globals.lock );
  461.     return EOK;
  462. }
  463.  
  464. void clear_device( arp_device_ref device ){
  465.     int             count;
  466.     arp_proto_ref   proto;
  467.  
  468.     for( count = arp_protos_count( & device->protos ) - 1; count >= 0; -- count ){
  469.         proto = arp_protos_get_index( & device->protos, count );
  470.         if( proto ){
  471.             if( proto->addr ) free( proto->addr );
  472.             if( proto->addr_data ) free( proto->addr_data );
  473.             arp_addr_destroy( & proto->addresses );
  474.         }
  475.     }
  476.     arp_protos_clear( & device->protos );
  477. }
  478.  
  479. int arp_clean_cache_message( void ){
  480.     int             count;
  481.     arp_device_ref  device;
  482.  
  483.     rwlock_write_lock( & arp_globals.lock );
  484.     for( count = arp_cache_count( & arp_globals.cache ) - 1; count >= 0; -- count ){
  485.         device = arp_cache_get_index( & arp_globals.cache, count );
  486.         if( device ){
  487.             clear_device( device );
  488.             if( device->addr_data ) free( device->addr_data );
  489.             if( device->broadcast_data ) free( device->broadcast_data );
  490.         }
  491.     }
  492.     arp_cache_clear( & arp_globals.cache );
  493.     rwlock_write_unlock( & arp_globals.lock );
  494.     printf( "\nCache cleaned" );
  495.     return EOK;
  496. }
  497.  
  498. int arp_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
  499.     ERROR_DECLARE;
  500.  
  501.     measured_string_ref address;
  502.     measured_string_ref translation;
  503.     char *              data;
  504.  
  505.     * answer_count = 0;
  506.     switch( IPC_GET_METHOD( * call )){
  507.         case IPC_M_PHONE_HUNGUP:
  508.             return EOK;
  509.         case NET_ARP_DEVICE:
  510.             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
  511.             if( ERROR_OCCURRED( arp_device_message( IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), IPC_GET_PROTO( call ), address ))){
  512.                 free( address );
  513.                 free( data );
  514.             }
  515.             return ERROR_CODE;
  516.         case NET_ARP_TRANSLATE:
  517.             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
  518.             translation = arp_translate_message( IPC_GET_DEVICE( call ), IPC_GET_PROTO( call ), address );
  519.             free( address );
  520.             free( data );
  521.             if( ! translation ) return ENOENT;
  522.             return measured_strings_reply( translation, 1 );
  523.         case NET_ARP_CLEAR_DEVICE:
  524.             return arp_clear_device_message( IPC_GET_DEVICE( call ));
  525.         case NET_ARP_CLEAN_CACHE:
  526.             return arp_clean_cache_message();
  527.     }
  528.     return ENOTSUP;
  529. }
  530.  
  531. void arp_receiver( ipc_callid_t iid, ipc_call_t * icall ){
  532.     ERROR_DECLARE;
  533.  
  534.     packet_t        packet;
  535.  
  536.     while( true ){
  537.         switch( IPC_GET_METHOD( * icall )){
  538.             case NET_IL_DEVICE_STATE:
  539.                 // do nothing - keep the cache
  540.                 ipc_answer_0( iid, EOK );
  541.                 break;
  542.             case NET_IL_RECEIVED:
  543.                 if( ! ERROR_OCCURRED( packet_translate( arp_globals.networking_phone, & packet, IPC_GET_PACKET( icall )))){
  544.                     ERROR_CODE = arp_receive_message( IPC_GET_DEVICE( icall ), packet );
  545.                 }
  546.                 ipc_answer_0( iid, ERROR_CODE );
  547.                 break;
  548.             default:
  549.                 ipc_answer_0( iid, ENOTSUP );
  550.         }
  551.         iid = async_get_call( icall );
  552.     }
  553. }
  554.  
  555. /** @}
  556.  */
  557.