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