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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 <rwlock.h>
  41. #include <stdio.h>
  42. #include <string.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.  
  196.     rwlock_write_lock( & arp_globals.lock );
  197.     // an existing device?
  198.     device = arp_cache_find( & arp_globals.cache, device_id );
  199.     if( device ){
  200.         if( device->service != service ){
  201.             printf( "\nDevice %d already exists", device->device_id );
  202.             rwlock_write_unlock( & arp_globals.lock );
  203.             return EEXIST;
  204.         }
  205.         proto = arp_protos_find( & device->protos, protocol );
  206.         if( proto ){
  207.             free( proto->addr );
  208.             free( proto->addr_data );
  209.             proto->addr = address;
  210.             proto->addr_data = address->value;
  211.         }else{
  212.             if( ERROR_OCCURRED( arp_proto_create( & proto, protocol, address ))){
  213.                 rwlock_write_unlock( & arp_globals.lock );
  214.                 return ERROR_CODE;
  215.             }
  216.             if( ERROR_OCCURRED( arp_protos_add( & device->protos, proto->service, proto ))){
  217.                 rwlock_write_unlock( & arp_globals.lock );
  218.                 free( proto );
  219.                 return ERROR_CODE;
  220.             }
  221.         }
  222.         printf( "\nCache of the existing device %d cleaned", device->device_id );
  223.     }else{
  224.         // create a new device
  225.         device = ( arp_device_ref ) malloc( sizeof( arp_device_t ));
  226.         if( ! device ){
  227.             rwlock_write_unlock( & arp_globals.lock );
  228.             return ENOMEM;
  229.         }
  230.         device->device_id = device_id;
  231.         if( ERROR_OCCURRED( arp_protos_initialize( & device->protos ))
  232.         || ERROR_OCCURRED( arp_proto_create( & proto, protocol, address ))){
  233.             rwlock_write_unlock( & arp_globals.lock );
  234.             free( device );
  235.             return ERROR_CODE;
  236.         }
  237.         if( ERROR_OCCURRED( arp_protos_add( & device->protos, proto->service, proto ))){
  238.             rwlock_write_unlock( & arp_globals.lock );
  239.             arp_protos_destroy( & device->protos );
  240.             free( device );
  241.             return ERROR_CODE;
  242.         }
  243.         device->service = service;
  244.         // bind the new one
  245.         device->phone = bind_service( device->service, device->device_id, SERVICE_ARP, 0, arp_receiver );
  246.         // get packet dimensions
  247.         if( ERROR_OCCURRED( async_req_1_4( device->phone, NET_NIL_PACKET_SPACE, device_id, & device->addr_len, & device->prefix, & device->content, & device->suffix ))){
  248.             rwlock_write_unlock( & arp_globals.lock );
  249.             arp_protos_destroy( & device->protos );
  250.             free( device );
  251.             return ERROR_CODE;
  252.         }
  253.         // get hardware address
  254.         message = async_send_1( device->phone, NET_NIL_ADDR, device->device_id, & answer );
  255.         if( ERROR_OCCURRED( measured_strings_return( device->phone, & device->addr, & device->addr_data, 1 ))){
  256.             rwlock_write_unlock( & arp_globals.lock );
  257.             arp_protos_destroy( & device->protos );
  258.             free( device );
  259.             async_wait_for( message, NULL );
  260.             return ERROR_CODE;
  261.         }
  262.         async_wait_for( message, & result );
  263.         if( ERROR_OCCURRED( result )){
  264.             rwlock_write_unlock( & arp_globals.lock );
  265.             free( device->addr );
  266.             free( device->addr_data );
  267.             arp_protos_destroy( & device->protos );
  268.             free( device );
  269.             return ERROR_CODE;
  270.         }
  271.         // get broadcast address
  272.         message = async_send_1( device->phone, NET_NIL_BROADCAST_ADDR, device->device_id, & answer );
  273.         if( ERROR_OCCURRED( measured_strings_return( device->phone, & device->broadcast_addr, & device->broadcast_data, 1 ))){
  274.             rwlock_write_unlock( & arp_globals.lock );
  275.             free( device->addr );
  276.             free( device->addr_data );
  277.             arp_protos_destroy( & device->protos );
  278.             free( device );
  279.             async_wait_for( message, NULL );
  280.             return ERROR_CODE;
  281.         }
  282.         async_wait_for( message, & result );
  283.         // add to the cache
  284.         if( ERROR_OCCURRED( result )
  285.         || ERROR_OCCURRED( arp_cache_add( & arp_globals.cache, device->device_id, device ))){
  286.             rwlock_write_unlock( & arp_globals.lock );
  287.             free( device->addr );
  288.             free( device->addr_data );
  289.             free( device->broadcast_addr );
  290.             free( device->broadcast_data );
  291.             arp_protos_destroy( & device->protos );
  292.             free( device );
  293.             return ERROR_CODE;
  294.         }
  295.         printf( "\nNew device registered:\n\tid\t= %d\n\ttype\t= %x\n\tservice\t= %d", device->device_id, device->hardware, device->service );
  296.     }
  297.     rwlock_write_unlock( & arp_globals.lock );
  298.     return EOK;
  299. }
  300.  
  301. measured_string_ref arp_translate_message( device_id_t device_id, services_t protocol, measured_string_ref target ){
  302.     arp_device_ref      device;
  303.     arp_proto_ref       proto;
  304.     measured_string_ref addr;
  305.     size_t              length;
  306.     packet_t            packet;
  307.     arp_header_ref      header;
  308.  
  309.     if( ! target ) return NULL;
  310.     rwlock_read_lock( & arp_globals.lock );
  311.     device = arp_cache_find( & arp_globals.cache, device_id );
  312.     if( ! device ){
  313.         rwlock_read_unlock( & arp_globals.lock );
  314.         return NULL;
  315.     }
  316.     proto = arp_protos_find( & device->protos, protocol );
  317.     if(( ! proto ) || ( proto->addr->length != target->length )){
  318.         rwlock_read_unlock( & arp_globals.lock );
  319.         return NULL;
  320.     }
  321.     addr = arp_addr_find( & proto->addresses, target->value, target->length );
  322.     if( addr ){
  323.         rwlock_read_unlock( & arp_globals.lock );
  324.         return addr;
  325.     }
  326.     // ARP packet content size = header + ( address + translation ) * 2
  327.     length = 8 + ( CONVERT_SIZE( char, uint8_t, proto->addr->length ) + CONVERT_SIZE( char, uint8_t, device->addr->length )) * 2;
  328.     if( length > device->content ){
  329.         rwlock_read_unlock( & arp_globals.lock );
  330.         return NULL;
  331.     }
  332.     packet = packet_get_4( arp_globals.networking_phone, device->addr_len, device->prefix, length, device->suffix );
  333.     if( ! packet ){
  334.         rwlock_read_unlock( & arp_globals.lock );
  335.         return NULL;
  336.     }
  337.     header = ( arp_header_ref ) packet_suffix( packet, length );
  338.     header->hardware = device->hardware;
  339.     header->hardware_length = device->addr->length;
  340.     header->protocol = protocol_map( device->service, protocol );
  341.     header->protocol_length = proto->addr->length;
  342.     header->operation = ARPOP_REQUEST;
  343.     length = sizeof( arp_header_t );
  344.     memcpy((( uint8_t * ) header ) + length, device->addr->value, device->addr->length );
  345.     length += device->addr->length;
  346.     memcpy((( uint8_t * ) header ) + length, proto->addr->value, proto->addr->length );
  347.     length += proto->addr->length;
  348.     memset((( uint8_t * ) header ) + length, 0, device->addr->length );
  349.     length += device->addr->length;
  350.     memcpy((( uint8_t * ) header ) + length, target->value, target->length );
  351.     packet_set_addr( packet, ( uint8_t * ) device->addr->value, ( uint8_t * ) device->broadcast_addr->value, CONVERT_SIZE( char, uint8_t, device->addr->length ));
  352.     async_msg_3( device->phone, NET_NETIF_SEND, device_id, SERVICE_ARP, packet_get_id( packet ));
  353.     rwlock_read_unlock( & arp_globals.lock );
  354.     return NULL;
  355. }
  356.  
  357. int arp_receive_message( device_id_t device_id, packet_t packet ){
  358.     ERROR_DECLARE;
  359.  
  360.     size_t              length;
  361.     arp_header_ref      header;
  362.     arp_device_ref      device;
  363.     arp_proto_ref       proto;
  364.     measured_string_ref hw_source;
  365.     uint8_t *           src_hw;
  366.     uint8_t *           src_proto;
  367.     uint8_t *           des_hw;
  368.     uint8_t *           des_proto;
  369.  
  370.     length = packet_get_data_length( packet );
  371.     if( length <= sizeof( arp_header_t )) return EINVAL;
  372.     rwlock_read_lock( & arp_globals.lock );
  373.     device = arp_cache_find( & arp_globals.cache, device_id );
  374.     if( ! device ){
  375.         rwlock_read_unlock( & arp_globals.lock );
  376.         return ENOENT;
  377.     }
  378.     header = ( arp_header_ref ) packet_get_data( packet );
  379.     if(( header->hardware != device->hardware )
  380.     || ( length < sizeof( arp_header_t ) + ( header->hardware_length + header->protocol_length ) * 2 )){
  381.         rwlock_read_unlock( & arp_globals.lock );
  382.         return EINVAL;
  383.     }
  384.     proto = arp_protos_find( & device->protos, protocol_unmap( device->service, header->protocol ));
  385.     if( ! proto ){
  386.         rwlock_read_unlock( & arp_globals.lock );
  387.         return ENOENT;
  388.     }
  389.     src_hw = (( uint8_t * ) header ) + sizeof( arp_header_t );
  390.     src_proto = src_hw + header->hardware_length;
  391.     des_hw = src_proto + header->protocol_length;
  392.     des_proto = des_hw + header->hardware_length;
  393.     hw_source = arp_addr_find( & proto->addresses, ( char * ) src_proto, CONVERT_SIZE( uint8_t, char, header->protocol_length ));
  394.     // exists?
  395.     if( hw_source ){
  396.         if( hw_source->length != CONVERT_SIZE( uint8_t, char, header->hardware_length )){
  397.             rwlock_read_unlock( & arp_globals.lock );
  398.             return EINVAL;
  399.         }
  400.         memcpy( hw_source->value, src_hw, hw_source->length );
  401.     }
  402.     // is my protocol address?
  403.     if( proto->addr->length != CONVERT_SIZE( uint8_t, char, header->hardware_length )){
  404.         rwlock_read_unlock( & arp_globals.lock );
  405.         return EINVAL;
  406.     }
  407.     if( ! strncmp( proto->addr->value, ( char * ) des_proto, proto->addr->length )){
  408.         // not already upadted?
  409.         if( ! hw_source ){
  410.             hw_source = measured_string_create_bulk(( char * ) src_hw, CONVERT_SIZE( uint8_t, char, header->hardware_length ));
  411.             if( ! hw_source ){
  412.                 rwlock_read_unlock( & arp_globals.lock );
  413.                 return ENOMEM;
  414.             }
  415.             if( ERROR_OCCURRED( arp_addr_add( & proto->addresses, ( char * ) src_proto, CONVERT_SIZE( uint8_t, char, header->protocol_length ), hw_source ))){
  416.                 rwlock_read_unlock( & arp_globals.lock );
  417.                 return ERROR_CODE;
  418.             }
  419.         }
  420.         if( header->operation == ARPOP_REQUEST ){
  421.             header->operation = ARPOP_REPLY;
  422.             memcpy( des_proto, src_proto, header->protocol_length );
  423.             memcpy( src_proto, proto->addr->value, header->protocol_length );
  424.             memcpy( src_hw, des_hw, header->hardware_length );
  425.             memcpy( des_hw, hw_source->value, header->hardware_length );
  426.             packet_set_addr( packet, src_hw, des_hw, header->hardware_length );
  427.             async_msg_3( device->phone, NET_NETIF_SEND, device_id, SERVICE_ARP, packet_get_id( packet ));
  428.             rwlock_read_unlock( & arp_globals.lock );
  429.         }else{
  430.             rwlock_read_unlock( & arp_globals.lock );
  431.             packet_release( arp_globals.networking_phone, packet_get_id( packet ));
  432.         }
  433.     }
  434.     return EOK;
  435. }
  436.  
  437. int arp_clear_device_message( device_id_t device_id ){
  438.     arp_device_ref  device;
  439.  
  440.     rwlock_write_lock( & arp_globals.lock );
  441.     device = arp_cache_find( & arp_globals.cache, device_id );
  442.     if( ! device ){
  443.         rwlock_write_unlock( & arp_globals.lock );
  444.         return ENOENT;
  445.     }
  446.     clear_device( device );
  447.     printf( "\nDevice %d cleared", device_id );
  448.     rwlock_write_unlock( & arp_globals.lock );
  449.     return EOK;
  450. }
  451.  
  452. void clear_device( arp_device_ref device ){
  453.     int             count;
  454.     arp_proto_ref   proto;
  455.  
  456.     count = arp_protos_count( & device->protos );
  457.     while( count > 0 ){
  458.         proto = arp_protos_get_index( & device->protos, count );
  459.         if( proto->addr ) free( proto->addr );
  460.         if( proto->addr_data ) free( proto->addr_data );
  461.         arp_addr_destroy( & proto->addresses );
  462.         -- count;
  463.     }
  464.     arp_protos_clear( & device->protos );
  465. }
  466.  
  467. int arp_clean_cache_message( void ){
  468.     int             count;
  469.     arp_device_ref  device;
  470.  
  471.     rwlock_write_lock( & arp_globals.lock );
  472.     count = arp_cache_count( & arp_globals.cache );
  473.     while( count > 0 ){
  474.         device = arp_cache_get_index( & arp_globals.cache, count );
  475.         if( device ){
  476.             clear_device( device );
  477.             if( device->addr_data ) free( device->addr_data );
  478.             if( device->broadcast_data ) free( device->broadcast_data );
  479.         }
  480.     }
  481.     arp_cache_clear( & arp_globals.cache );
  482.     rwlock_write_unlock( & arp_globals.lock );
  483.     printf( "\nCache cleaned" );
  484.     return EOK;
  485. }
  486.  
  487. int arp_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
  488.     ERROR_DECLARE;
  489.  
  490.     measured_string_ref address;
  491.     measured_string_ref translation;
  492.     char *              data;
  493.  
  494.     * answer_count = 0;
  495.     switch( IPC_GET_METHOD( * call )){
  496.         case IPC_M_PHONE_HUNGUP:
  497.             return EOK;
  498.         case NET_ARP_DEVICE:
  499.             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
  500.             if( ERROR_OCCURRED( arp_device_message( IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), IPC_GET_PROTO( call ), address ))){
  501.                 free( address );
  502.                 free( data );
  503.             }
  504.             return ERROR_CODE;
  505.         case NET_ARP_TRANSLATE:
  506.             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
  507.             translation = arp_translate_message( IPC_GET_DEVICE( call ), IPC_GET_PROTO( call ), address );
  508.             free( address );
  509.             free( data );
  510.             if( ! translation ) return ENOENT;
  511.             return measured_strings_reply( translation, 1 );
  512.         case NET_ARP_CLEAR_DEVICE:
  513.             return arp_clear_device_message( IPC_GET_DEVICE( call ));
  514.         case NET_ARP_CLEAN_CACHE:
  515.             return arp_clean_cache_message();
  516.     }
  517.     return ENOTSUP;
  518. }
  519.  
  520. void arp_receiver( ipc_callid_t iid, ipc_call_t * icall ){
  521.     ERROR_DECLARE;
  522.  
  523.     packet_t        packet;
  524.  
  525.     while( true ){
  526.         switch( IPC_GET_METHOD( * icall )){
  527.             case NET_IL_DEVICE_STATE:
  528.                 // do nothing - keep the cache
  529.                 ipc_answer_0( iid, EOK );
  530.                 break;
  531.             case NET_IL_RECEIVED:
  532.                 if( ! ERROR_OCCURRED( packet_translate( arp_globals.networking_phone, & packet, IPC_GET_PACKET( icall )))){
  533.                     ERROR_CODE = arp_receive_message( IPC_GET_DEVICE( icall ), packet );
  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.