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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 <fibril_sync.h>
  42. #include <stdio.h>
  43. #include <string.h>
  44. #include <task.h>
  45.  
  46. #include <ipc/ipc.h>
  47. #include <ipc/services.h>
  48.  
  49. #include "../../err.h"
  50. #include "../../messages.h"
  51. #include "../../modules.h"
  52.  
  53. #include "../../include/byteorder.h"
  54. #include "../../include/device.h"
  55. #include "../../include/arp_interface.h"
  56. #include "../../include/nil_interface.h"
  57. #include "../../include/protocol_map.h"
  58.  
  59. #include "../../structures/measured_strings.h"
  60. #include "../../structures/packet/packet.h"
  61. #include "../../structures/packet/packet_client.h"
  62.  
  63. #include "../il_messages.h"
  64.  
  65. #include "arp.h"
  66. #include "arp_header.h"
  67. #include "arp_oc.h"
  68. #include "arp_module.h"
  69. #include "arp_messages.h"
  70.  
  71. /** ARP global data.
  72.  */
  73. arp_globals_t   arp_globals;
  74.  
  75. /** Creates new protocol specific data.
  76.  *  Allocates and returns the needed memory block as the proto parameter.
  77.  *  @param[out] proto The allocated protocol specific data.
  78.  *  @param[in] service The protocol module service.
  79.  *  @param[in] address The actual protocol device address.
  80.  *  @returns EOK on success.
  81.  *  @returns ENOMEM if there is not enough memory left.
  82.  */
  83. int arp_proto_create( arp_proto_ref * proto, services_t service, measured_string_ref address );
  84.  
  85. /** Clears the device specific data.
  86.  *  @param[in] device The device specific data.
  87.  */
  88. void    arp_clear_device( arp_device_ref device );
  89.  
  90. /** @name Message processing functions
  91.  */
  92. /*@{*/
  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[in] device_id The device identifier.
  97.  *  @param[in] service The device driver service.
  98.  *  @param[in] protocol The protocol service.
  99.  *  @param[in] 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[in] device_id The device identifier.
  110.  *  @param[in] protocol The protocol service.
  111.  *  @param[in] target The target protocol address.
  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[in] device_id The source device identifier.
  124.  *  @param[in,out] packet The received packet.
  125.  *  @returns EOK on success and the packet is no longer needed.
  126.  *  @returns 1 on success and the packet has been reused.
  127.  *  @returns EINVAL if the packet is too small to carry an ARP packet.
  128.  *  @returns EINVAL if the received address lengths differs from the registered values.
  129.  *  @returns ENOENT if the device is not found in the cache.
  130.  *  @returns ENOENT if the protocol for the device is not found in the cache.
  131.  *  @returns ENOMEM if there is not enough memory left.
  132.  */
  133. int arp_receive_message( device_id_t device_id, packet_t packet );
  134.  
  135. /** Updates the device content length according to the new MTU value.
  136.  *  @param[in] device_id The device identifier.
  137.  *  @param[in] mtu The new mtu value.
  138.  *  @returns ENOENT if device is not found.
  139.  *  @returns EOK on success.
  140.  */
  141. int arp_mtu_changed_message( device_id_t device_id, size_t mtu );
  142.  
  143. /*@}*/
  144.  
  145. DEVICE_MAP_IMPLEMENT( arp_cache, arp_device_t )
  146.  
  147. INT_MAP_IMPLEMENT( arp_protos, arp_proto_t )
  148.  
  149. GENERIC_CHAR_MAP_IMPLEMENT( arp_addr, measured_string_t )
  150.  
  151. task_id_t arp_task_get_id( void ){
  152.     return task_get_id();
  153. }
  154.  
  155. int arp_clear_device_req( int arp_phone, device_id_t device_id ){
  156.     arp_device_ref  device;
  157.  
  158.     fibril_rwlock_write_lock( & arp_globals.lock );
  159.     device = arp_cache_find( & arp_globals.cache, device_id );
  160.     if( ! device ){
  161.         fibril_rwlock_write_unlock( & arp_globals.lock );
  162.         return ENOENT;
  163.     }
  164.     arp_clear_device( device );
  165.     printf( "Device %d cleared\n", device_id );
  166.     fibril_rwlock_write_unlock( & arp_globals.lock );
  167.     return EOK;
  168. }
  169.  
  170. int arp_clear_address_req( int arp_phone, device_id_t device_id, services_t protocol, measured_string_ref address ){
  171.     arp_device_ref  device;
  172.     arp_proto_ref   proto;
  173.  
  174.     fibril_rwlock_write_lock( & arp_globals.lock );
  175.     device = arp_cache_find( & arp_globals.cache, device_id );
  176.     if( ! device ){
  177.         fibril_rwlock_write_unlock( & arp_globals.lock );
  178.         return ENOENT;
  179.     }
  180.     proto = arp_protos_find( & device->protos, protocol );
  181.     if( ! proto ){
  182.         fibril_rwlock_write_unlock( & arp_globals.lock );
  183.         return ENOENT;
  184.     }
  185.     arp_addr_exclude( & proto->addresses, address->value, address->length );
  186.     fibril_rwlock_write_unlock( & arp_globals.lock );
  187.     return EOK;
  188. }
  189.  
  190. int arp_clean_cache_req( int arp_phone ){
  191.     int             count;
  192.     arp_device_ref  device;
  193.  
  194.     fibril_rwlock_write_lock( & arp_globals.lock );
  195.     for( count = arp_cache_count( & arp_globals.cache ) - 1; count >= 0; -- count ){
  196.         device = arp_cache_get_index( & arp_globals.cache, count );
  197.         if( device ){
  198.             arp_clear_device( device );
  199.             if( device->addr_data ) free( device->addr_data );
  200.             if( device->broadcast_data ) free( device->broadcast_data );
  201.         }
  202.     }
  203.     arp_cache_clear( & arp_globals.cache );
  204.     fibril_rwlock_write_unlock( & arp_globals.lock );
  205.     printf( "Cache cleaned\n" );
  206.     return EOK;
  207. }
  208.  
  209. int arp_device_req( int arp_phone, device_id_t device_id, services_t protocol, services_t netif, measured_string_ref address ){
  210.     ERROR_DECLARE;
  211.  
  212.     measured_string_ref tmp;
  213.  
  214.     // copy the given address for exclusive use
  215.     tmp = measured_string_copy( address );
  216.     if( ERROR_OCCURRED( arp_device_message( device_id, netif, protocol, tmp ))){
  217.         free( tmp->value );
  218.         free( tmp );
  219.     }
  220.     return ERROR_CODE;
  221. }
  222.  
  223. 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 ){
  224.     measured_string_ref tmp;
  225.  
  226.     fibril_rwlock_read_lock( & arp_globals.lock );
  227.     tmp = arp_translate_message( device_id, protocol, address );
  228.     if( tmp ){
  229.         * translation = measured_string_copy( tmp );
  230.         fibril_rwlock_read_unlock( & arp_globals.lock );
  231.         if( * translation ){
  232.             * data = ( ** translation ).value;
  233.             return EOK;
  234.         }else{
  235.             return ENOMEM;
  236.         }
  237.     }else{
  238.         fibril_rwlock_read_unlock( & arp_globals.lock );
  239.         return ENOENT;
  240.     }
  241. }
  242.  
  243. int arp_initialize( async_client_conn_t client_connection ){
  244.     ERROR_DECLARE;
  245.  
  246.     fibril_rwlock_initialize( & arp_globals.lock );
  247.     fibril_rwlock_write_lock( & arp_globals.lock );
  248.     arp_globals.client_connection = client_connection;
  249.     ERROR_PROPAGATE( arp_cache_initialize( & arp_globals.cache ));
  250.     fibril_rwlock_write_unlock( & arp_globals.lock );
  251.     return EOK;
  252. }
  253.  
  254. int arp_proto_create( arp_proto_ref * proto, services_t service, measured_string_ref address ){
  255.     ERROR_DECLARE;
  256.  
  257.     * proto = ( arp_proto_ref ) malloc( sizeof( arp_proto_t ));
  258.     if( !( * proto )) return ENOMEM;
  259.     ( ** proto ).service = service;
  260.     ( ** proto ).addr = address;
  261.     ( ** proto ).addr_data = address->value;
  262.     if( ERROR_OCCURRED( arp_addr_initialize( &( ** proto).addresses ))){
  263.         free( * proto );
  264.         return ERROR_CODE;
  265.     }
  266.     return EOK;
  267. }
  268.  
  269. int arp_device_message( device_id_t device_id, services_t service, services_t protocol, measured_string_ref address ){
  270.     ERROR_DECLARE;
  271.  
  272.     arp_device_ref  device;
  273.     arp_proto_ref   proto;
  274.     int             index;
  275.     hw_type_t       hardware;
  276.  
  277.     fibril_rwlock_write_lock( & arp_globals.lock );
  278.     // an existing device?
  279.     device = arp_cache_find( & arp_globals.cache, device_id );
  280.     if( device ){
  281.         if( device->service != service ){
  282.             printf( "Device %d already exists\n", device->device_id );
  283.             fibril_rwlock_write_unlock( & arp_globals.lock );
  284.             return EEXIST;
  285.         }
  286.         proto = arp_protos_find( & device->protos, protocol );
  287.         if( proto ){
  288.             free( proto->addr );
  289.             free( proto->addr_data );
  290.             proto->addr = address;
  291.             proto->addr_data = address->value;
  292.         }else{
  293.             if( ERROR_OCCURRED( arp_proto_create( & proto, protocol, address ))){
  294.                 fibril_rwlock_write_unlock( & arp_globals.lock );
  295.                 return ERROR_CODE;
  296.             }
  297.             index = arp_protos_add( & device->protos, proto->service, proto );
  298.             if( index < 0 ){
  299.                 fibril_rwlock_write_unlock( & arp_globals.lock );
  300.                 free( proto );
  301.                 return index;
  302.             }
  303.             printf( "New protocol added:\n\tdevice id\t= %d\n\tproto\t= %d", device_id, protocol );
  304.         }
  305.     }else{
  306.         hardware = hardware_map( service );
  307.         if( ! hardware ) return ENOENT;
  308.         // create a new device
  309.         device = ( arp_device_ref ) malloc( sizeof( arp_device_t ));
  310.         if( ! device ){
  311.             fibril_rwlock_write_unlock( & arp_globals.lock );
  312.             return ENOMEM;
  313.         }
  314.         device->hardware = hardware;
  315.         device->device_id = device_id;
  316.         if( ERROR_OCCURRED( arp_protos_initialize( & device->protos ))
  317.         || ERROR_OCCURRED( arp_proto_create( & proto, protocol, address ))){
  318.             fibril_rwlock_write_unlock( & arp_globals.lock );
  319.             free( device );
  320.             return ERROR_CODE;
  321.         }
  322.         index = arp_protos_add( & device->protos, proto->service, proto );
  323.         if( index < 0 ){
  324.             fibril_rwlock_write_unlock( & arp_globals.lock );
  325.             arp_protos_destroy( & device->protos );
  326.             free( device );
  327.             return index;
  328.         }
  329.         device->service = service;
  330.         // bind the new one
  331.         device->phone = nil_bind_service( device->service, ( ipcarg_t ) device->device_id, SERVICE_ARP, arp_globals.client_connection );
  332.         if( device->phone < 0 ){
  333.             fibril_rwlock_write_unlock( & arp_globals.lock );
  334.             arp_protos_destroy( & device->protos );
  335.             free( device );
  336.             return EREFUSED;
  337.         }
  338.         // get packet dimensions
  339.         if( ERROR_OCCURRED( nil_packet_size_req( device->phone, device_id, & device->addr_len, & device->prefix, & device->content, & device->suffix ))){
  340.             fibril_rwlock_write_unlock( & arp_globals.lock );
  341.             arp_protos_destroy( & device->protos );
  342.             free( device );
  343.             return ERROR_CODE;
  344.         }
  345.         // get hardware address
  346.         if( ERROR_OCCURRED( nil_get_addr_req( device->phone, device_id, & device->addr, & device->addr_data ))){
  347.             fibril_rwlock_write_unlock( & arp_globals.lock );
  348.             arp_protos_destroy( & device->protos );
  349.             free( device );
  350.             return ERROR_CODE;
  351.         }
  352.         // get broadcast address
  353.         if( ERROR_OCCURRED( nil_get_broadcast_addr_req( device->phone, device_id, & device->broadcast_addr, & device->broadcast_data ))){
  354.             fibril_rwlock_write_unlock( & arp_globals.lock );
  355.             free( device->addr );
  356.             free( device->addr_data );
  357.             arp_protos_destroy( & device->protos );
  358.             free( device );
  359.             return ERROR_CODE;
  360.         }
  361.         if( ERROR_OCCURRED( arp_cache_add( & arp_globals.cache, device->device_id, device ))){
  362.             fibril_rwlock_write_unlock( & arp_globals.lock );
  363.             free( device->addr );
  364.             free( device->addr_data );
  365.             free( device->broadcast_addr );
  366.             free( device->broadcast_data );
  367.             arp_protos_destroy( & device->protos );
  368.             free( device );
  369.             return ERROR_CODE;
  370.         }
  371.         printf( "New device registered:\n\tid\t= %d\n\ttype\t= 0x%x\n\tservice\t= %d\n\tproto\t= %d\n", device->device_id, device->hardware, device->service, protocol );
  372.     }
  373.     fibril_rwlock_write_unlock( & arp_globals.lock );
  374.     return EOK;
  375. }
  376.  
  377. measured_string_ref arp_translate_message( device_id_t device_id, services_t protocol, measured_string_ref target ){
  378.     arp_device_ref      device;
  379.     arp_proto_ref       proto;
  380.     measured_string_ref addr;
  381.     size_t              length;
  382.     packet_t            packet;
  383.     arp_header_ref      header;
  384.  
  385.     if( ! target ) return NULL;
  386.     device = arp_cache_find( & arp_globals.cache, device_id );
  387.     if( ! device ) return NULL;
  388.     proto = arp_protos_find( & device->protos, protocol );
  389.     if(( ! proto ) || ( proto->addr->length != target->length )) return NULL;
  390.     addr = arp_addr_find( & proto->addresses, target->value, target->length );
  391.     if( addr ) return addr;
  392.     // ARP packet content size = header + ( address + translation ) * 2
  393.     length = 8 + ( CONVERT_SIZE( char, uint8_t, proto->addr->length ) + CONVERT_SIZE( char, uint8_t, device->addr->length )) * 2;
  394.     if( length > device->content ) return NULL;
  395.     packet = packet_get_4( arp_globals.net_phone, device->addr_len, device->prefix, length, device->suffix );
  396.     if( ! packet ) return NULL;
  397.     header = ( arp_header_ref ) packet_suffix( packet, length );
  398.     if( ! header ){
  399.         pq_release( arp_globals.net_phone, packet_get_id( packet ));
  400.         return NULL;
  401.     }
  402.     header->hardware = htons( device->hardware );
  403.     header->hardware_length = ( uint8_t ) device->addr->length;
  404.     header->protocol = htons( protocol_map( device->service, protocol ));
  405.     header->protocol_length = ( uint8_t ) proto->addr->length;
  406.     header->operation = htons( ARPOP_REQUEST );
  407.     length = sizeof( arp_header_t );
  408.     memcpy((( uint8_t * ) header ) + length, device->addr->value, device->addr->length );
  409.     length += device->addr->length;
  410.     memcpy((( uint8_t * ) header ) + length, proto->addr->value, proto->addr->length );
  411.     length += proto->addr->length;
  412.     bzero((( uint8_t * ) header ) + length, device->addr->length );
  413.     length += device->addr->length;
  414.     memcpy((( uint8_t * ) header ) + length, target->value, target->length );
  415.     if( packet_set_addr( packet, ( uint8_t * ) device->addr->value, ( uint8_t * ) device->broadcast_addr->value, CONVERT_SIZE( char, uint8_t, device->addr->length )) != EOK ){
  416.         pq_release( arp_globals.net_phone, packet_get_id( packet ));
  417.         return NULL;
  418.     }
  419.     nil_send_msg( device->phone, device_id, packet, SERVICE_ARP );
  420.     return NULL;
  421. }
  422.  
  423. int arp_receive_message( device_id_t device_id, packet_t packet ){
  424.     ERROR_DECLARE;
  425.  
  426.     size_t              length;
  427.     arp_header_ref      header;
  428.     arp_device_ref      device;
  429.     arp_proto_ref       proto;
  430.     measured_string_ref hw_source;
  431.     uint8_t *           src_hw;
  432.     uint8_t *           src_proto;
  433.     uint8_t *           des_hw;
  434.     uint8_t *           des_proto;
  435.  
  436.     length = packet_get_data_length( packet );
  437.     if( length <= sizeof( arp_header_t )) return EINVAL;
  438.     device = arp_cache_find( & arp_globals.cache, device_id );
  439.     if( ! device ) return ENOENT;
  440.     header = ( arp_header_ref ) packet_get_data( packet );
  441.     if(( ntohs( header->hardware ) != device->hardware )
  442.     || ( length < sizeof( arp_header_t ) + header->hardware_length * 2u + header->protocol_length * 2u )){
  443.         return EINVAL;
  444.     }
  445.     proto = arp_protos_find( & device->protos, protocol_unmap( device->service, ntohs( header->protocol )));
  446.     if( ! proto ) return ENOENT;
  447.     src_hw = (( uint8_t * ) header ) + sizeof( arp_header_t );
  448.     src_proto = src_hw + header->hardware_length;
  449.     des_hw = src_proto + header->protocol_length;
  450.     des_proto = des_hw + header->hardware_length;
  451.     hw_source = arp_addr_find( & proto->addresses, ( char * ) src_proto, CONVERT_SIZE( uint8_t, char, header->protocol_length ));
  452.     // exists?
  453.     if( hw_source ){
  454.         if( hw_source->length != CONVERT_SIZE( uint8_t, char, header->hardware_length )){
  455.             return EINVAL;
  456.         }
  457.         memcpy( hw_source->value, src_hw, hw_source->length );
  458.     }
  459.     // is my protocol address?
  460.     if( proto->addr->length != CONVERT_SIZE( uint8_t, char, header->protocol_length )){
  461.         return EINVAL;
  462.     }
  463.     if( ! str_lcmp( proto->addr->value, ( char * ) des_proto, proto->addr->length )){
  464.         // not already upadted?
  465.         if( ! hw_source ){
  466.             hw_source = measured_string_create_bulk(( char * ) src_hw, CONVERT_SIZE( uint8_t, char, header->hardware_length ));
  467.             if( ! hw_source ) return ENOMEM;
  468.             ERROR_PROPAGATE( arp_addr_add( & proto->addresses, ( char * ) src_proto, CONVERT_SIZE( uint8_t, char, header->protocol_length ), hw_source ));
  469.         }
  470.         if( ntohs( header->operation ) == ARPOP_REQUEST ){
  471.             header->operation = htons( ARPOP_REPLY );
  472.             memcpy( des_proto, src_proto, header->protocol_length );
  473.             memcpy( src_proto, proto->addr->value, header->protocol_length );
  474.             memcpy( src_hw, device->addr->value, device->addr_len );
  475.             memcpy( des_hw, hw_source->value, header->hardware_length );
  476.             ERROR_PROPAGATE( packet_set_addr( packet, src_hw, des_hw, header->hardware_length ));
  477.             nil_send_msg( device->phone, device_id, packet, SERVICE_ARP );
  478.             return 1;
  479.         }
  480.     }
  481.     return EOK;
  482. }
  483.  
  484. void arp_clear_device( arp_device_ref device ){
  485.     int             count;
  486.     arp_proto_ref   proto;
  487.  
  488.     for( count = arp_protos_count( & device->protos ) - 1; count >= 0; -- count ){
  489.         proto = arp_protos_get_index( & device->protos, count );
  490.         if( proto ){
  491.             if( proto->addr ) free( proto->addr );
  492.             if( proto->addr_data ) free( proto->addr_data );
  493.             arp_addr_destroy( & proto->addresses );
  494.         }
  495.     }
  496.     arp_protos_clear( & device->protos );
  497. }
  498.  
  499. int arp_connect_module( services_t service ){
  500.     if( service != SERVICE_ARP ) return EINVAL;
  501.     return EOK;
  502. }
  503.  
  504. int arp_mtu_changed_message( device_id_t device_id, size_t mtu ){
  505.     arp_device_ref  device;
  506.  
  507.     fibril_rwlock_write_lock( & arp_globals.lock );
  508.     device = arp_cache_find( & arp_globals.cache, device_id );
  509.     if( ! device ){
  510.         fibril_rwlock_write_unlock( & arp_globals.lock );
  511.         return ENOENT;
  512.     }
  513.     device->content = mtu;
  514.     printf( "arp - device %d changed mtu to %d\n\n", device_id, mtu );
  515.     fibril_rwlock_write_unlock( & arp_globals.lock );
  516.     return EOK;
  517. }
  518.  
  519. int arp_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
  520.     ERROR_DECLARE;
  521.  
  522.     measured_string_ref address;
  523.     measured_string_ref translation;
  524.     char *              data;
  525.     packet_t            packet;
  526.     packet_t            next;
  527.  
  528. //  printf( "message %d - %d\n", IPC_GET_METHOD( * call ), NET_ARP_FIRST );
  529.     * answer_count = 0;
  530.     switch( IPC_GET_METHOD( * call )){
  531.         case IPC_M_PHONE_HUNGUP:
  532.             return EOK;
  533.         case NET_ARP_DEVICE:
  534.             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
  535.             if( ERROR_OCCURRED( arp_device_message( IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), ARP_GET_NETIF( call ), address ))){
  536.                 free( address );
  537.                 free( data );
  538.             }
  539.             return ERROR_CODE;
  540.         case NET_ARP_TRANSLATE:
  541.             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
  542.             fibril_rwlock_read_lock( & arp_globals.lock );
  543.             translation = arp_translate_message( IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), address );
  544.             free( address );
  545.             free( data );
  546.             if( ! translation ){
  547.                 fibril_rwlock_read_unlock( & arp_globals.lock );
  548.                 return ENOENT;
  549.             }
  550.             ERROR_CODE = measured_strings_reply( translation, 1 );
  551.             fibril_rwlock_read_unlock( & arp_globals.lock );
  552.             return ERROR_CODE;
  553.         case NET_ARP_CLEAR_DEVICE:
  554.             return arp_clear_device_req( 0, IPC_GET_DEVICE( call ));
  555.         case NET_ARP_CLEAR_ADDRESS:
  556.             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
  557.             arp_clear_address_req( 0, IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), address );
  558.             free( address );
  559.             free( data );
  560.             return EOK;
  561.         case NET_ARP_CLEAN_CACHE:
  562.             return arp_clean_cache_req( 0 );
  563.         case NET_IL_DEVICE_STATE:
  564.             // do nothing - keep the cache
  565.             return EOK;
  566.         case NET_IL_RECEIVED:
  567.             if( ! ERROR_OCCURRED( packet_translate( arp_globals.net_phone, & packet, IPC_GET_PACKET( call )))){
  568.                 fibril_rwlock_read_lock( & arp_globals.lock );
  569.                 do{
  570.                     next = pq_detach( packet );
  571.                     ERROR_CODE = arp_receive_message( IPC_GET_DEVICE( call ), packet );
  572.                     if( ERROR_CODE != 1 ) pq_release( arp_globals.net_phone, packet_get_id( packet ));
  573.                     packet = next;
  574.                 }while( packet );
  575.                 fibril_rwlock_read_unlock( & arp_globals.lock );
  576.             }
  577.             return ERROR_CODE;
  578.         case NET_IL_MTU_CHANGED:
  579.             return arp_mtu_changed_message( IPC_GET_DEVICE( call ), IPC_GET_MTU( call ));
  580.     }
  581.     return ENOTSUP;
  582. }
  583.  
  584. /** @}
  585.  */
  586.