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