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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. #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. DEVICE_MAP_IMPLEMENT( arp_cache, arp_device_t )
  131.  
  132. INT_MAP_IMPLEMENT( arp_protos, arp_proto_t )
  133.  
  134. GENERIC_CHAR_MAP_IMPLEMENT( arp_addr, measured_string_t )
  135.  
  136. task_id_t arp_task_get_id( void ){
  137.     return task_get_id();
  138. }
  139.  
  140. int arp_clear_device_req( int arp_phone, device_id_t device_id ){
  141.     arp_device_ref  device;
  142.  
  143.     rwlock_write_lock( & arp_globals.lock );
  144.     device = arp_cache_find( & arp_globals.cache, device_id );
  145.     if( ! device ){
  146.         rwlock_write_unlock( & arp_globals.lock );
  147.         return ENOENT;
  148.     }
  149.     clear_device( device );
  150.     printf( "Device %d cleared\n", device_id );
  151.     rwlock_write_unlock( & arp_globals.lock );
  152.     return EOK;
  153. }
  154.  
  155. int arp_clean_cache_req( int arp_phone ){
  156.     int             count;
  157.     arp_device_ref  device;
  158.  
  159.     rwlock_write_lock( & arp_globals.lock );
  160.     for( count = arp_cache_count( & arp_globals.cache ) - 1; count >= 0; -- count ){
  161.         device = arp_cache_get_index( & arp_globals.cache, count );
  162.         if( device ){
  163.             clear_device( device );
  164.             if( device->addr_data ) free( device->addr_data );
  165.             if( device->broadcast_data ) free( device->broadcast_data );
  166.         }
  167.     }
  168.     arp_cache_clear( & arp_globals.cache );
  169.     rwlock_write_unlock( & arp_globals.lock );
  170.     printf( "Cache cleaned\n" );
  171.     return EOK;
  172. }
  173.  
  174. int arp_device_req( int arp_phone, device_id_t device_id, services_t protocol, services_t netif, measured_string_ref address ){
  175.     ERROR_DECLARE;
  176.  
  177.     measured_string_ref tmp;
  178.  
  179.     tmp = measured_string_copy( address );
  180.     if( ERROR_OCCURRED( arp_device_message( device_id, netif, protocol, tmp ))){
  181.         free( tmp->value );
  182.         free( tmp );
  183.     }
  184.     return ERROR_CODE;
  185. }
  186.  
  187. 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 ){
  188.     measured_string_ref tmp;
  189.  
  190.     rwlock_read_lock( & arp_globals.lock );
  191.     tmp = arp_translate_message( device_id, protocol, address );
  192.     if( tmp ){
  193.         * translation = measured_string_copy( tmp );
  194.         rwlock_read_unlock( & arp_globals.lock );
  195.         if( * translation ){
  196.             * data = ( ** translation ).value;
  197.             return EOK;
  198.         }else{
  199.             return ENOMEM;
  200.         }
  201.     }else{
  202.         rwlock_read_unlock( & arp_globals.lock );
  203.         return ENOENT;
  204.     }
  205. }
  206.  
  207. int arp_initialize( async_client_conn_t client_connection ){
  208.     ERROR_DECLARE;
  209.  
  210.     rwlock_initialize( & arp_globals.lock );
  211.     rwlock_write_lock( & arp_globals.lock );
  212.     arp_globals.client_connection = client_connection;
  213.     ERROR_PROPAGATE( arp_cache_initialize( & arp_globals.cache ));
  214.     rwlock_write_unlock( & arp_globals.lock );
  215.     return EOK;
  216. }
  217.  
  218. int arp_proto_create( arp_proto_ref * proto, services_t service, measured_string_ref address ){
  219.     ERROR_DECLARE;
  220.  
  221.     * proto = ( arp_proto_ref ) malloc( sizeof( arp_proto_t ));
  222.     if( !( * proto )) return ENOMEM;
  223.     ( ** proto ).service = service;
  224.     ( ** proto ).addr = address;
  225.     ( ** proto ).addr_data = address->value;
  226.     if( ERROR_OCCURRED( arp_addr_initialize( &( ** proto).addresses ))){
  227.         free( * proto );
  228.         return ERROR_CODE;
  229.     }
  230.     return EOK;
  231. }
  232.  
  233. int arp_device_message( device_id_t device_id, services_t service, services_t protocol, measured_string_ref address ){
  234.     ERROR_DECLARE;
  235.  
  236.     arp_device_ref  device;
  237.     arp_proto_ref   proto;
  238.     int             index;
  239.  
  240.     rwlock_write_lock( & arp_globals.lock );
  241.     // an existing device?
  242.     device = arp_cache_find( & arp_globals.cache, device_id );
  243.     if( device ){
  244.         if( device->service != service ){
  245.             printf( "Device %d already exists\n", device->device_id );
  246.             rwlock_write_unlock( & arp_globals.lock );
  247.             return EEXIST;
  248.         }
  249.         proto = arp_protos_find( & device->protos, protocol );
  250.         if( proto ){
  251.             free( proto->addr );
  252.             free( proto->addr_data );
  253.             proto->addr = address;
  254.             proto->addr_data = address->value;
  255.         }else{
  256.             if( ERROR_OCCURRED( arp_proto_create( & proto, protocol, address ))){
  257.                 rwlock_write_unlock( & arp_globals.lock );
  258.                 return ERROR_CODE;
  259.             }
  260.             index = arp_protos_add( & device->protos, proto->service, proto );
  261.             if( index < 0 ){
  262.                 rwlock_write_unlock( & arp_globals.lock );
  263.                 free( proto );
  264.                 return index;
  265.             }
  266.             printf( "New protocol added:\n\tdevice id\t= %d\n\tproto\t= %d", device_id, protocol );
  267.         }
  268.     }else{
  269.         index = hardware_map( service );
  270.         if( ! index ) return ENOENT;
  271.         // create a new device
  272.         device = ( arp_device_ref ) malloc( sizeof( arp_device_t ));
  273.         if( ! device ){
  274.             rwlock_write_unlock( & arp_globals.lock );
  275.             return ENOMEM;
  276.         }
  277.         device->hardware = index;
  278.         device->device_id = device_id;
  279.         if( ERROR_OCCURRED( arp_protos_initialize( & device->protos ))
  280.         || ERROR_OCCURRED( arp_proto_create( & proto, protocol, address ))){
  281.             rwlock_write_unlock( & arp_globals.lock );
  282.             free( device );
  283.             return ERROR_CODE;
  284.         }
  285.         index = arp_protos_add( & device->protos, proto->service, proto );
  286.         if( index < 0 ){
  287.             rwlock_write_unlock( & arp_globals.lock );
  288.             arp_protos_destroy( & device->protos );
  289.             free( device );
  290.             return index;
  291.         }
  292.         device->service = service;
  293.         // bind the new one
  294.         device->phone = bind_service( device->service, device->device_id, SERVICE_ARP, 0, arp_globals.client_connection );
  295.         if( device->phone < 0 ){
  296.             rwlock_write_unlock( & arp_globals.lock );
  297.             arp_protos_destroy( & device->protos );
  298.             free( device );
  299.             return EREFUSED;
  300.         }
  301.         // get packet dimensions
  302.         if( ERROR_OCCURRED( nil_packet_size_req( device->phone, device_id, & device->addr_len, & device->prefix, & device->content, & device->suffix ))){
  303.             rwlock_write_unlock( & arp_globals.lock );
  304.             arp_protos_destroy( & device->protos );
  305.             free( device );
  306.             return ERROR_CODE;
  307.         }
  308.         // get hardware address
  309.         if( ERROR_OCCURRED( nil_get_addr( device->phone, device_id, & device->addr, & device->addr_data ))){
  310.             rwlock_write_unlock( & arp_globals.lock );
  311.             arp_protos_destroy( & device->protos );
  312.             free( device );
  313.             return ERROR_CODE;
  314.         }
  315.         // get broadcast address
  316.         if( ERROR_OCCURRED( nil_get_broadcast_addr( device->phone, device_id, & device->broadcast_addr, & device->broadcast_data ))){
  317.             rwlock_write_unlock( & arp_globals.lock );
  318.             free( device->addr );
  319.             free( device->addr_data );
  320.             arp_protos_destroy( & device->protos );
  321.             free( device );
  322.             return ERROR_CODE;
  323.         }
  324.         if( ERROR_OCCURRED( arp_cache_add( & arp_globals.cache, device->device_id, device ))){
  325.             rwlock_write_unlock( & arp_globals.lock );
  326.             free( device->addr );
  327.             free( device->addr_data );
  328.             free( device->broadcast_addr );
  329.             free( device->broadcast_data );
  330.             arp_protos_destroy( & device->protos );
  331.             free( device );
  332.             return ERROR_CODE;
  333.         }
  334.         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 );
  335.     }
  336.     rwlock_write_unlock( & arp_globals.lock );
  337.     return EOK;
  338. }
  339.  
  340. measured_string_ref arp_translate_message( device_id_t device_id, services_t protocol, measured_string_ref target ){
  341.     arp_device_ref      device;
  342.     arp_proto_ref       proto;
  343.     measured_string_ref addr;
  344.     size_t              length;
  345.     packet_t            packet;
  346.     arp_header_ref      header;
  347.  
  348.     if( ! target ) return NULL;
  349.     device = arp_cache_find( & arp_globals.cache, device_id );
  350.     if( ! device ) return NULL;
  351.     proto = arp_protos_find( & device->protos, protocol );
  352.     if(( ! proto ) || ( proto->addr->length != target->length )) return NULL;
  353.     addr = arp_addr_find( & proto->addresses, target->value, target->length );
  354.     if( addr ) return addr;
  355.     // ARP packet content size = header + ( address + translation ) * 2
  356.     length = 8 + ( CONVERT_SIZE( char, uint8_t, proto->addr->length ) + CONVERT_SIZE( char, uint8_t, device->addr->length )) * 2;
  357.     if( length > device->content ) return NULL;
  358.     packet = packet_get_4( arp_globals.net_phone, device->addr_len, device->prefix, length, device->suffix );
  359.     if( ! packet ) return NULL;
  360.     header = ( arp_header_ref ) packet_suffix( packet, length );
  361.     if( ! header ){
  362.         pq_release( arp_globals.net_phone, packet_get_id( packet ));
  363.         return NULL;
  364.     }
  365.     header->hardware = htons( device->hardware );
  366.     header->hardware_length = device->addr->length;
  367.     header->protocol = htons( protocol_map( device->service, protocol ));
  368.     header->protocol_length = proto->addr->length;
  369.     header->operation = htons( ARPOP_REQUEST );
  370.     length = sizeof( arp_header_t );
  371.     memcpy((( uint8_t * ) header ) + length, device->addr->value, device->addr->length );
  372.     length += device->addr->length;
  373.     memcpy((( uint8_t * ) header ) + length, proto->addr->value, proto->addr->length );
  374.     length += proto->addr->length;
  375.     bzero((( uint8_t * ) header ) + length, device->addr->length );
  376.     length += device->addr->length;
  377.     memcpy((( uint8_t * ) header ) + length, target->value, target->length );
  378.     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 ){
  379.         pq_release( arp_globals.net_phone, packet_get_id( packet ));
  380.         return NULL;
  381.     }
  382.     nil_send_msg( device->phone, device_id, packet, SERVICE_ARP );
  383.     return NULL;
  384. }
  385.  
  386. int arp_receive_message( device_id_t device_id, packet_t packet ){
  387.     ERROR_DECLARE;
  388.  
  389.     size_t              length;
  390.     arp_header_ref      header;
  391.     arp_device_ref      device;
  392.     arp_proto_ref       proto;
  393.     measured_string_ref hw_source;
  394.     uint8_t *           src_hw;
  395.     uint8_t *           src_proto;
  396.     uint8_t *           des_hw;
  397.     uint8_t *           des_proto;
  398.  
  399.     length = packet_get_data_length( packet );
  400.     if( length <= sizeof( arp_header_t )) return EINVAL;
  401.     device = arp_cache_find( & arp_globals.cache, device_id );
  402.     if( ! device ) return ENOENT;
  403.     header = ( arp_header_ref ) packet_get_data( packet );
  404.     if(( ntohs( header->hardware ) != device->hardware )
  405.     || ( length < sizeof( arp_header_t ) + ( header->hardware_length + header->protocol_length ) * 2 )){
  406.         return EINVAL;
  407.     }
  408.     proto = arp_protos_find( & device->protos, protocol_unmap( device->service, ntohs( header->protocol )));
  409.     if( ! proto ) return ENOENT;
  410.     src_hw = (( uint8_t * ) header ) + sizeof( arp_header_t );
  411.     src_proto = src_hw + header->hardware_length;
  412.     des_hw = src_proto + header->protocol_length;
  413.     des_proto = des_hw + header->hardware_length;
  414.     hw_source = arp_addr_find( & proto->addresses, ( char * ) src_proto, CONVERT_SIZE( uint8_t, char, header->protocol_length ));
  415.     // exists?
  416.     if( hw_source ){
  417.         if( hw_source->length != CONVERT_SIZE( uint8_t, char, header->hardware_length )){
  418.             return EINVAL;
  419.         }
  420.         memcpy( hw_source->value, src_hw, hw_source->length );
  421.     }
  422.     // is my protocol address?
  423.     if( proto->addr->length != CONVERT_SIZE( uint8_t, char, header->protocol_length )){
  424.         return EINVAL;
  425.     }
  426.     if( ! str_lcmp( proto->addr->value, ( char * ) des_proto, proto->addr->length )){
  427.         // not already upadted?
  428.         if( ! hw_source ){
  429.             hw_source = measured_string_create_bulk(( char * ) src_hw, CONVERT_SIZE( uint8_t, char, header->hardware_length ));
  430.             if( ! hw_source ) return ENOMEM;
  431.             ERROR_PROPAGATE( arp_addr_add( & proto->addresses, ( char * ) src_proto, CONVERT_SIZE( uint8_t, char, header->protocol_length ), hw_source ));
  432.         }
  433.         if( ntohs( header->operation ) == ARPOP_REQUEST ){
  434.             header->operation = htons( ARPOP_REPLY );
  435.             memcpy( des_proto, src_proto, header->protocol_length );
  436.             memcpy( src_proto, proto->addr->value, header->protocol_length );
  437.             memcpy( src_hw, device->addr->value, device->addr_len );
  438.             memcpy( des_hw, hw_source->value, header->hardware_length );
  439.             ERROR_PROPAGATE( packet_set_addr( packet, src_hw, des_hw, header->hardware_length ));
  440.             nil_send_msg( device->phone, device_id, packet, SERVICE_ARP );
  441.             return 1;
  442.         }
  443.     }
  444.     return EOK;
  445. }
  446.  
  447. void clear_device( arp_device_ref device ){
  448.     int             count;
  449.     arp_proto_ref   proto;
  450.  
  451.     for( count = arp_protos_count( & device->protos ) - 1; count >= 0; -- count ){
  452.         proto = arp_protos_get_index( & device->protos, count );
  453.         if( proto ){
  454.             if( proto->addr ) free( proto->addr );
  455.             if( proto->addr_data ) free( proto->addr_data );
  456.             arp_addr_destroy( & proto->addresses );
  457.         }
  458.     }
  459.     arp_protos_clear( & device->protos );
  460. }
  461.  
  462. int arp_connect_module( services_t service ){
  463.     return EOK;
  464. }
  465.  
  466. int arp_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
  467.     ERROR_DECLARE;
  468.  
  469.     measured_string_ref address;
  470.     measured_string_ref translation;
  471.     char *              data;
  472.     packet_t            packet;
  473.     packet_t            next;
  474.  
  475. //  printf( "message %d - %d\n", IPC_GET_METHOD( * call ), NET_ARP_FIRST );
  476.     * answer_count = 0;
  477.     switch( IPC_GET_METHOD( * call )){
  478.         case IPC_M_PHONE_HUNGUP:
  479.             return EOK;
  480.         case NET_ARP_DEVICE:
  481.             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
  482.             if( ERROR_OCCURRED( arp_device_message( IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), ARP_GET_NETIF( call ), address ))){
  483.                 free( address );
  484.                 free( data );
  485.             }
  486.             return ERROR_CODE;
  487.         case NET_ARP_TRANSLATE:
  488.             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
  489.             rwlock_read_lock( & arp_globals.lock );
  490.             translation = arp_translate_message( IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), address );
  491.             free( address );
  492.             free( data );
  493.             if( ! translation ){
  494.                 rwlock_read_unlock( & arp_globals.lock );
  495.                 return ENOENT;
  496.             }
  497.             ERROR_CODE = measured_strings_reply( translation, 1 );
  498.             rwlock_read_unlock( & arp_globals.lock );
  499.             return ERROR_CODE;
  500.         case NET_ARP_CLEAR_DEVICE:
  501.             return arp_clear_device_req( 0, IPC_GET_DEVICE( call ));
  502.         case NET_ARP_CLEAN_CACHE:
  503.             return arp_clean_cache_req( 0 );
  504.         case NET_IL_DEVICE_STATE:
  505.             // do nothing - keep the cache
  506.             return EOK;
  507.         case NET_IL_RECEIVED:
  508.             if( ! ERROR_OCCURRED( packet_translate( arp_globals.net_phone, & packet, IPC_GET_PACKET( call )))){
  509.                 rwlock_read_lock( & arp_globals.lock );
  510.                 do{
  511.                     next = pq_detach( packet );
  512.                     ERROR_CODE = arp_receive_message( IPC_GET_DEVICE( call ), packet );
  513.                     if( ERROR_CODE != 1 ) pq_release( arp_globals.net_phone, packet_get_id( packet ));
  514.                     packet = next;
  515.                 }while( packet );
  516.                 rwlock_read_unlock( & arp_globals.lock );
  517.             }
  518.             return ERROR_CODE;
  519.     }
  520.     return ENOTSUP;
  521. }
  522.  
  523. /** @}
  524.  */
  525.