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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.  *  @param proto Protocol specific data. Output parameter.
  77.  *  @param service Protocol module service. Input parameter.
  78.  *  @param address Actual protocol device address. Input parameter.
  79.  *  @returns EOK on success.
  80.  *  @returns ENOMEM if there is not enough memory left.
  81.  */
  82. int arp_proto_create( arp_proto_ref * proto, services_t service, measured_string_ref address );
  83.  
  84. /** Registers the device.
  85.  *  Creates new device entry in the cache or updates the protocol address if the device with the device identifier and the driver service exists.
  86.  *  @param device_id The device identifier. Input parameter.
  87.  *  @param service The device driver service. Input parameter.
  88.  *  @param protocol The protocol service. Input parameter.
  89.  *  @param address The actual device protocol address.
  90.  *  @returns EOK on success.
  91.  *  @returns EEXIST if another device with the same device identifier and different driver service exists.
  92.  *  @returns ENOMEM if there is not enough memory left.
  93.  *  @returns Other error codes as defined for the measured_strings_return() function.
  94.  */
  95. int arp_device_message( device_id_t device_id, services_t service, services_t protocol, measured_string_ref address );
  96.  
  97. /** Returns the hardware address for the given protocol address.
  98.  *  Sends the ARP request packet if the hardware address is not found in the cache.
  99.  *  @param device_id The device identifier. Input parameter.
  100.  *  @param protocol The protocol service. Input parameter.
  101.  *  @param target The target protocol address. Input parameter.
  102.  *  @returns The hardware address of the target.
  103.  *  @returns NULL if the target parameter is NULL.
  104.  *  @returns NULL if the device is not found.
  105.  *  @returns NULL if the device packet is too small to send a&nbsp;request.
  106.  *  @returns NULL if the hardware address is not found in the cache.
  107.  */
  108. measured_string_ref arp_translate_message( device_id_t device_id, services_t protocol, measured_string_ref target );
  109.  
  110. /** Processes the received ARP packet.
  111.  *  Updates the source hardware address if the source entry exists or the packet is targeted to my protocol address.
  112.  *  Responses to the ARP request if the packet is the ARP request and is targeted to my address.
  113.  *  @param device_id The source device identifier. Input parameter.
  114.  *  @param packet The received packet. Input/output parameter.
  115.  *  @returns EOK on success and the packet is no longer needed.
  116.  *  @returns 1 on success and the packet has been reused.
  117.  *  @returns EINVAL if the packet is too small to carry the ARP packet.
  118.  *  @returns EINVAL if the received address lengths differs from the registered values.
  119.  *  @returns ENOENT if the device is not found in the cache.
  120.  *  @returns ENOENT if the protocol for the device is not found in the cache.
  121.  *  @returns ENOMEM if there is not enough memory left.
  122.  */
  123. int arp_receive_message( device_id_t device_id, packet_t packet );
  124.  
  125. /** Clears the device specific data.
  126.  *  @param device The device specific data.
  127.  */
  128. void    clear_device( arp_device_ref device );
  129.  
  130. /** Updates the device content length according to the new MTU value.
  131.  *  @param device_id The device identifier. Input parameter.
  132.  *  @param mtu The new mtu value. Input parameter.
  133.  *  @returns EOK on success.
  134.  */
  135. int arp_mtu_changed_msg( device_id_t device_id, size_t mtu );
  136.  
  137. DEVICE_MAP_IMPLEMENT( arp_cache, arp_device_t )
  138.  
  139. INT_MAP_IMPLEMENT( arp_protos, arp_proto_t )
  140.  
  141. GENERIC_CHAR_MAP_IMPLEMENT( arp_addr, measured_string_t )
  142.  
  143. task_id_t arp_task_get_id( void ){
  144.     return task_get_id();
  145. }
  146.  
  147. int arp_clear_device_req( int arp_phone, device_id_t device_id ){
  148.     arp_device_ref  device;
  149.  
  150.     fibril_rwlock_write_lock( & arp_globals.lock );
  151.     device = arp_cache_find( & arp_globals.cache, device_id );
  152.     if( ! device ){
  153.         fibril_rwlock_write_unlock( & arp_globals.lock );
  154.         return ENOENT;
  155.     }
  156.     clear_device( device );
  157.     printf( "Device %d cleared\n", device_id );
  158.     fibril_rwlock_write_unlock( & arp_globals.lock );
  159.     return EOK;
  160. }
  161.  
  162. int arp_clear_address_req( int arp_phone, device_id_t device_id, services_t protocol, measured_string_ref address ){
  163.     arp_device_ref  device;
  164.     arp_proto_ref   proto;
  165.  
  166.     fibril_rwlock_write_lock( & arp_globals.lock );
  167.     device = arp_cache_find( & arp_globals.cache, device_id );
  168.     if( ! device ){
  169.         fibril_rwlock_write_unlock( & arp_globals.lock );
  170.         return ENOENT;
  171.     }
  172.     proto = arp_protos_find( & device->protos, protocol );
  173.     if( ! proto ){
  174.         fibril_rwlock_write_unlock( & arp_globals.lock );
  175.         return ENOENT;
  176.     }
  177.     arp_addr_exclude( & proto->addresses, address->value, address->length );
  178.     fibril_rwlock_write_unlock( & arp_globals.lock );
  179.     return EOK;
  180. }
  181.  
  182. int arp_clean_cache_req( int arp_phone ){
  183.     int             count;
  184.     arp_device_ref  device;
  185.  
  186.     fibril_rwlock_write_lock( & arp_globals.lock );
  187.     for( count = arp_cache_count( & arp_globals.cache ) - 1; count >= 0; -- count ){
  188.         device = arp_cache_get_index( & arp_globals.cache, count );
  189.         if( device ){
  190.             clear_device( device );
  191.             if( device->addr_data ) free( device->addr_data );
  192.             if( device->broadcast_data ) free( device->broadcast_data );
  193.         }
  194.     }
  195.     arp_cache_clear( & arp_globals.cache );
  196.     fibril_rwlock_write_unlock( & arp_globals.lock );
  197.     printf( "Cache cleaned\n" );
  198.     return EOK;
  199. }
  200.  
  201. int arp_device_req( int arp_phone, device_id_t device_id, services_t protocol, services_t netif, measured_string_ref address ){
  202.     ERROR_DECLARE;
  203.  
  204.     measured_string_ref tmp;
  205.  
  206.     tmp = measured_string_copy( address );
  207.     if( ERROR_OCCURRED( arp_device_message( device_id, netif, protocol, tmp ))){
  208.         free( tmp->value );
  209.         free( tmp );
  210.     }
  211.     return ERROR_CODE;
  212. }
  213.  
  214. 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 ){
  215.     measured_string_ref tmp;
  216.  
  217.     fibril_rwlock_read_lock( & arp_globals.lock );
  218.     tmp = arp_translate_message( device_id, protocol, address );
  219.     if( tmp ){
  220.         * translation = measured_string_copy( tmp );
  221.         fibril_rwlock_read_unlock( & arp_globals.lock );
  222.         if( * translation ){
  223.             * data = ( ** translation ).value;
  224.             return EOK;
  225.         }else{
  226.             return ENOMEM;
  227.         }
  228.     }else{
  229.         fibril_rwlock_read_unlock( & arp_globals.lock );
  230.         return ENOENT;
  231.     }
  232. }
  233.  
  234. int arp_initialize( async_client_conn_t client_connection ){
  235.     ERROR_DECLARE;
  236.  
  237.     fibril_rwlock_initialize( & arp_globals.lock );
  238.     fibril_rwlock_write_lock( & arp_globals.lock );
  239.     arp_globals.client_connection = client_connection;
  240.     ERROR_PROPAGATE( arp_cache_initialize( & arp_globals.cache ));
  241.     fibril_rwlock_write_unlock( & arp_globals.lock );
  242.     return EOK;
  243. }
  244.  
  245. int arp_proto_create( arp_proto_ref * proto, services_t service, measured_string_ref address ){
  246.     ERROR_DECLARE;
  247.  
  248.     * proto = ( arp_proto_ref ) malloc( sizeof( arp_proto_t ));
  249.     if( !( * proto )) return ENOMEM;
  250.     ( ** proto ).service = service;
  251.     ( ** proto ).addr = address;
  252.     ( ** proto ).addr_data = address->value;
  253.     if( ERROR_OCCURRED( arp_addr_initialize( &( ** proto).addresses ))){
  254.         free( * proto );
  255.         return ERROR_CODE;
  256.     }
  257.     return EOK;
  258. }
  259.  
  260. int arp_device_message( device_id_t device_id, services_t service, services_t protocol, measured_string_ref address ){
  261.     ERROR_DECLARE;
  262.  
  263.     arp_device_ref  device;
  264.     arp_proto_ref   proto;
  265.     int             index;
  266.     hw_type_t       hardware;
  267.  
  268.     fibril_rwlock_write_lock( & arp_globals.lock );
  269.     // an existing device?
  270.     device = arp_cache_find( & arp_globals.cache, device_id );
  271.     if( device ){
  272.         if( device->service != service ){
  273.             printf( "Device %d already exists\n", device->device_id );
  274.             fibril_rwlock_write_unlock( & arp_globals.lock );
  275.             return EEXIST;
  276.         }
  277.         proto = arp_protos_find( & device->protos, protocol );
  278.         if( proto ){
  279.             free( proto->addr );
  280.             free( proto->addr_data );
  281.             proto->addr = address;
  282.             proto->addr_data = address->value;
  283.         }else{
  284.             if( ERROR_OCCURRED( arp_proto_create( & proto, protocol, address ))){
  285.                 fibril_rwlock_write_unlock( & arp_globals.lock );
  286.                 return ERROR_CODE;
  287.             }
  288.             index = arp_protos_add( & device->protos, proto->service, proto );
  289.             if( index < 0 ){
  290.                 fibril_rwlock_write_unlock( & arp_globals.lock );
  291.                 free( proto );
  292.                 return index;
  293.             }
  294.             printf( "New protocol added:\n\tdevice id\t= %d\n\tproto\t= %d", device_id, protocol );
  295.         }
  296.     }else{
  297.         hardware = hardware_map( service );
  298.         if( ! hardware ) return ENOENT;
  299.         // create a new device
  300.         device = ( arp_device_ref ) malloc( sizeof( arp_device_t ));
  301.         if( ! device ){
  302.             fibril_rwlock_write_unlock( & arp_globals.lock );
  303.             return ENOMEM;
  304.         }
  305.         device->hardware = hardware;
  306.         device->device_id = device_id;
  307.         if( ERROR_OCCURRED( arp_protos_initialize( & device->protos ))
  308.         || ERROR_OCCURRED( arp_proto_create( & proto, protocol, address ))){
  309.             fibril_rwlock_write_unlock( & arp_globals.lock );
  310.             free( device );
  311.             return ERROR_CODE;
  312.         }
  313.         index = arp_protos_add( & device->protos, proto->service, proto );
  314.         if( index < 0 ){
  315.             fibril_rwlock_write_unlock( & arp_globals.lock );
  316.             arp_protos_destroy( & device->protos );
  317.             free( device );
  318.             return index;
  319.         }
  320.         device->service = service;
  321.         // bind the new one
  322.         device->phone = bind_service( device->service, ( ipcarg_t ) device->device_id, SERVICE_ARP, 0, arp_globals.client_connection );
  323.         if( device->phone < 0 ){
  324.             fibril_rwlock_write_unlock( & arp_globals.lock );
  325.             arp_protos_destroy( & device->protos );
  326.             free( device );
  327.             return EREFUSED;
  328.         }
  329.         // get packet dimensions
  330.         if( ERROR_OCCURRED( nil_packet_size_req( device->phone, device_id, & device->addr_len, & device->prefix, & device->content, & device->suffix ))){
  331.             fibril_rwlock_write_unlock( & arp_globals.lock );
  332.             arp_protos_destroy( & device->protos );
  333.             free( device );
  334.             return ERROR_CODE;
  335.         }
  336.         // get hardware address
  337.         if( ERROR_OCCURRED( nil_get_addr( device->phone, device_id, & device->addr, & device->addr_data ))){
  338.             fibril_rwlock_write_unlock( & arp_globals.lock );
  339.             arp_protos_destroy( & device->protos );
  340.             free( device );
  341.             return ERROR_CODE;
  342.         }
  343.         // get broadcast address
  344.         if( ERROR_OCCURRED( nil_get_broadcast_addr( device->phone, device_id, & device->broadcast_addr, & device->broadcast_data ))){
  345.             fibril_rwlock_write_unlock( & arp_globals.lock );
  346.             free( device->addr );
  347.             free( device->addr_data );
  348.             arp_protos_destroy( & device->protos );
  349.             free( device );
  350.             return ERROR_CODE;
  351.         }
  352.         if( ERROR_OCCURRED( arp_cache_add( & arp_globals.cache, device->device_id, device ))){
  353.             fibril_rwlock_write_unlock( & arp_globals.lock );
  354.             free( device->addr );
  355.             free( device->addr_data );
  356.             free( device->broadcast_addr );
  357.             free( device->broadcast_data );
  358.             arp_protos_destroy( & device->protos );
  359.             free( device );
  360.             return ERROR_CODE;
  361.         }
  362.         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 );
  363.     }
  364.     fibril_rwlock_write_unlock( & arp_globals.lock );
  365.     return EOK;
  366. }
  367.  
  368. measured_string_ref arp_translate_message( device_id_t device_id, services_t protocol, measured_string_ref target ){
  369.     arp_device_ref      device;
  370.     arp_proto_ref       proto;
  371.     measured_string_ref addr;
  372.     size_t              length;
  373.     packet_t            packet;
  374.     arp_header_ref      header;
  375.  
  376.     if( ! target ) return NULL;
  377.     device = arp_cache_find( & arp_globals.cache, device_id );
  378.     if( ! device ) return NULL;
  379.     proto = arp_protos_find( & device->protos, protocol );
  380.     if(( ! proto ) || ( proto->addr->length != target->length )) return NULL;
  381.     addr = arp_addr_find( & proto->addresses, target->value, target->length );
  382.     if( addr ) return addr;
  383.     // ARP packet content size = header + ( address + translation ) * 2
  384.     length = 8 + ( CONVERT_SIZE( char, uint8_t, proto->addr->length ) + CONVERT_SIZE( char, uint8_t, device->addr->length )) * 2;
  385.     if( length > device->content ) return NULL;
  386.     packet = packet_get_4( arp_globals.net_phone, device->addr_len, device->prefix, length, device->suffix );
  387.     if( ! packet ) return NULL;
  388.     header = ( arp_header_ref ) packet_suffix( packet, length );
  389.     if( ! header ){
  390.         pq_release( arp_globals.net_phone, packet_get_id( packet ));
  391.         return NULL;
  392.     }
  393.     header->hardware = htons( device->hardware );
  394.     header->hardware_length = ( uint8_t ) device->addr->length;
  395.     header->protocol = htons( protocol_map( device->service, protocol ));
  396.     header->protocol_length = ( uint8_t ) proto->addr->length;
  397.     header->operation = htons( ARPOP_REQUEST );
  398.     length = sizeof( arp_header_t );
  399.     memcpy((( uint8_t * ) header ) + length, device->addr->value, device->addr->length );
  400.     length += device->addr->length;
  401.     memcpy((( uint8_t * ) header ) + length, proto->addr->value, proto->addr->length );
  402.     length += proto->addr->length;
  403.     bzero((( uint8_t * ) header ) + length, device->addr->length );
  404.     length += device->addr->length;
  405.     memcpy((( uint8_t * ) header ) + length, target->value, target->length );
  406.     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 ){
  407.         pq_release( arp_globals.net_phone, packet_get_id( packet ));
  408.         return NULL;
  409.     }
  410.     nil_send_msg( device->phone, device_id, packet, SERVICE_ARP );
  411.     return NULL;
  412. }
  413.  
  414. int arp_receive_message( device_id_t device_id, packet_t packet ){
  415.     ERROR_DECLARE;
  416.  
  417.     size_t              length;
  418.     arp_header_ref      header;
  419.     arp_device_ref      device;
  420.     arp_proto_ref       proto;
  421.     measured_string_ref hw_source;
  422.     uint8_t *           src_hw;
  423.     uint8_t *           src_proto;
  424.     uint8_t *           des_hw;
  425.     uint8_t *           des_proto;
  426.  
  427.     length = packet_get_data_length( packet );
  428.     if( length <= sizeof( arp_header_t )) return EINVAL;
  429.     device = arp_cache_find( & arp_globals.cache, device_id );
  430.     if( ! device ) return ENOENT;
  431.     header = ( arp_header_ref ) packet_get_data( packet );
  432.     if(( ntohs( header->hardware ) != device->hardware )
  433.     // TODO how remove conversion from int '2' to uint?
  434.     || ( length < sizeof( arp_header_t ) + ( header->hardware_length + header->protocol_length ) * 2u )){
  435.         return EINVAL;
  436.     }
  437.     proto = arp_protos_find( & device->protos, protocol_unmap( device->service, ntohs( header->protocol )));
  438.     if( ! proto ) return ENOENT;
  439.     src_hw = (( uint8_t * ) header ) + sizeof( arp_header_t );
  440.     src_proto = src_hw + header->hardware_length;
  441.     des_hw = src_proto + header->protocol_length;
  442.     des_proto = des_hw + header->hardware_length;
  443.     hw_source = arp_addr_find( & proto->addresses, ( char * ) src_proto, CONVERT_SIZE( uint8_t, char, header->protocol_length ));
  444.     // exists?
  445.     if( hw_source ){
  446.         if( hw_source->length != CONVERT_SIZE( uint8_t, char, header->hardware_length )){
  447.             return EINVAL;
  448.         }
  449.         memcpy( hw_source->value, src_hw, hw_source->length );
  450.     }
  451.     // is my protocol address?
  452.     if( proto->addr->length != CONVERT_SIZE( uint8_t, char, header->protocol_length )){
  453.         return EINVAL;
  454.     }
  455.     if( ! str_lcmp( proto->addr->value, ( char * ) des_proto, proto->addr->length )){
  456.         // not already upadted?
  457.         if( ! hw_source ){
  458.             hw_source = measured_string_create_bulk(( char * ) src_hw, CONVERT_SIZE( uint8_t, char, header->hardware_length ));
  459.             if( ! hw_source ) return ENOMEM;
  460.             ERROR_PROPAGATE( arp_addr_add( & proto->addresses, ( char * ) src_proto, CONVERT_SIZE( uint8_t, char, header->protocol_length ), hw_source ));
  461.         }
  462.         if( ntohs( header->operation ) == ARPOP_REQUEST ){
  463.             header->operation = htons( ARPOP_REPLY );
  464.             memcpy( des_proto, src_proto, header->protocol_length );
  465.             memcpy( src_proto, proto->addr->value, header->protocol_length );
  466.             memcpy( src_hw, device->addr->value, device->addr_len );
  467.             memcpy( des_hw, hw_source->value, header->hardware_length );
  468.             ERROR_PROPAGATE( packet_set_addr( packet, src_hw, des_hw, header->hardware_length ));
  469.             nil_send_msg( device->phone, device_id, packet, SERVICE_ARP );
  470.             return 1;
  471.         }
  472.     }
  473.     return EOK;
  474. }
  475.  
  476. void clear_device( arp_device_ref device ){
  477.     int             count;
  478.     arp_proto_ref   proto;
  479.  
  480.     for( count = arp_protos_count( & device->protos ) - 1; count >= 0; -- count ){
  481.         proto = arp_protos_get_index( & device->protos, count );
  482.         if( proto ){
  483.             if( proto->addr ) free( proto->addr );
  484.             if( proto->addr_data ) free( proto->addr_data );
  485.             arp_addr_destroy( & proto->addresses );
  486.         }
  487.     }
  488.     arp_protos_clear( & device->protos );
  489. }
  490.  
  491. int arp_connect_module( services_t service ){
  492.     return EOK;
  493. }
  494.  
  495. int arp_mtu_changed_msg( device_id_t device_id, size_t mtu ){
  496.     arp_device_ref  device;
  497.  
  498.     fibril_rwlock_write_lock( & arp_globals.lock );
  499.     device = arp_cache_find( & arp_globals.cache, device_id );
  500.     if( ! device ){
  501.         fibril_rwlock_write_unlock( & arp_globals.lock );
  502.         return ENOENT;
  503.     }
  504.     device->content = mtu;
  505.     printf( "arp - device %d changed mtu to %d\n\n", device_id, mtu );
  506.     fibril_rwlock_write_unlock( & arp_globals.lock );
  507.     return EOK;
  508. }
  509.  
  510. int arp_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
  511.     ERROR_DECLARE;
  512.  
  513.     measured_string_ref address;
  514.     measured_string_ref translation;
  515.     char *              data;
  516.     packet_t            packet;
  517.     packet_t            next;
  518.  
  519. //  printf( "message %d - %d\n", IPC_GET_METHOD( * call ), NET_ARP_FIRST );
  520.     * answer_count = 0;
  521.     switch( IPC_GET_METHOD( * call )){
  522.         case IPC_M_PHONE_HUNGUP:
  523.             return EOK;
  524.         case NET_ARP_DEVICE:
  525.             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
  526.             if( ERROR_OCCURRED( arp_device_message( IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), ARP_GET_NETIF( call ), address ))){
  527.                 free( address );
  528.                 free( data );
  529.             }
  530.             return ERROR_CODE;
  531.         case NET_ARP_TRANSLATE:
  532.             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
  533.             fibril_rwlock_read_lock( & arp_globals.lock );
  534.             translation = arp_translate_message( IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), address );
  535.             free( address );
  536.             free( data );
  537.             if( ! translation ){
  538.                 fibril_rwlock_read_unlock( & arp_globals.lock );
  539.                 return ENOENT;
  540.             }
  541.             ERROR_CODE = measured_strings_reply( translation, 1 );
  542.             fibril_rwlock_read_unlock( & arp_globals.lock );
  543.             return ERROR_CODE;
  544.         case NET_ARP_CLEAR_DEVICE:
  545.             return arp_clear_device_req( 0, IPC_GET_DEVICE( call ));
  546.         case NET_ARP_CLEAR_ADDRESS:
  547.             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
  548.             arp_clear_address_req( 0, IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), address );
  549.             free( address );
  550.             free( data );
  551.             return EOK;
  552.         case NET_ARP_CLEAN_CACHE:
  553.             return arp_clean_cache_req( 0 );
  554.         case NET_IL_DEVICE_STATE:
  555.             // do nothing - keep the cache
  556.             return EOK;
  557.         case NET_IL_RECEIVED:
  558.             if( ! ERROR_OCCURRED( packet_translate( arp_globals.net_phone, & packet, IPC_GET_PACKET( call )))){
  559.                 fibril_rwlock_read_lock( & arp_globals.lock );
  560.                 do{
  561.                     next = pq_detach( packet );
  562.                     ERROR_CODE = arp_receive_message( IPC_GET_DEVICE( call ), packet );
  563.                     if( ERROR_CODE != 1 ) pq_release( arp_globals.net_phone, packet_get_id( packet ));
  564.                     packet = next;
  565.                 }while( packet );
  566.                 fibril_rwlock_read_unlock( & arp_globals.lock );
  567.             }
  568.             return ERROR_CODE;
  569.         case NET_IL_MTU_CHANGED:
  570.             return arp_mtu_changed_msg( IPC_GET_DEVICE( call ), IPC_GET_MTU( call ));
  571.     }
  572.     return ENOTSUP;
  573. }
  574.  
  575. /** @}
  576.  */
  577.