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