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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.     hw_type_t       hardware;
  240.  
  241.     rwlock_write_lock( & arp_globals.lock );
  242.     // an existing device?
  243.     device = arp_cache_find( & arp_globals.cache, device_id );
  244.     if( device ){
  245.         if( device->service != service ){
  246.             printf( "Device %d already exists\n", device->device_id );
  247.             rwlock_write_unlock( & arp_globals.lock );
  248.             return EEXIST;
  249.         }
  250.         proto = arp_protos_find( & device->protos, protocol );
  251.         if( proto ){
  252.             free( proto->addr );
  253.             free( proto->addr_data );
  254.             proto->addr = address;
  255.             proto->addr_data = address->value;
  256.         }else{
  257.             if( ERROR_OCCURRED( arp_proto_create( & proto, protocol, address ))){
  258.                 rwlock_write_unlock( & arp_globals.lock );
  259.                 return ERROR_CODE;
  260.             }
  261.             index = arp_protos_add( & device->protos, proto->service, proto );
  262.             if( index < 0 ){
  263.                 rwlock_write_unlock( & arp_globals.lock );
  264.                 free( proto );
  265.                 return index;
  266.             }
  267.             printf( "New protocol added:\n\tdevice id\t= %d\n\tproto\t= %d", device_id, protocol );
  268.         }
  269.     }else{
  270.         hardware = hardware_map( service );
  271.         if( ! hardware ) return ENOENT;
  272.         // create a new device
  273.         device = ( arp_device_ref ) malloc( sizeof( arp_device_t ));
  274.         if( ! device ){
  275.             rwlock_write_unlock( & arp_globals.lock );
  276.             return ENOMEM;
  277.         }
  278.         device->hardware = hardware;
  279.         device->device_id = device_id;
  280.         if( ERROR_OCCURRED( arp_protos_initialize( & device->protos ))
  281.         || ERROR_OCCURRED( arp_proto_create( & proto, protocol, address ))){
  282.             rwlock_write_unlock( & arp_globals.lock );
  283.             free( device );
  284.             return ERROR_CODE;
  285.         }
  286.         index = arp_protos_add( & device->protos, proto->service, proto );
  287.         if( index < 0 ){
  288.             rwlock_write_unlock( & arp_globals.lock );
  289.             arp_protos_destroy( & device->protos );
  290.             free( device );
  291.             return index;
  292.         }
  293.         device->service = service;
  294.         // bind the new one
  295.         device->phone = bind_service( device->service, ( ipcarg_t ) device->device_id, SERVICE_ARP, 0, arp_globals.client_connection );
  296.         if( device->phone < 0 ){
  297.             rwlock_write_unlock( & arp_globals.lock );
  298.             arp_protos_destroy( & device->protos );
  299.             free( device );
  300.             return EREFUSED;
  301.         }
  302.         // get packet dimensions
  303.         if( ERROR_OCCURRED( nil_packet_size_req( device->phone, device_id, & device->addr_len, & device->prefix, & device->content, & device->suffix ))){
  304.             rwlock_write_unlock( & arp_globals.lock );
  305.             arp_protos_destroy( & device->protos );
  306.             free( device );
  307.             return ERROR_CODE;
  308.         }
  309.         // get hardware address
  310.         if( ERROR_OCCURRED( nil_get_addr( device->phone, device_id, & device->addr, & device->addr_data ))){
  311.             rwlock_write_unlock( & arp_globals.lock );
  312.             arp_protos_destroy( & device->protos );
  313.             free( device );
  314.             return ERROR_CODE;
  315.         }
  316.         // get broadcast address
  317.         if( ERROR_OCCURRED( nil_get_broadcast_addr( device->phone, device_id, & device->broadcast_addr, & device->broadcast_data ))){
  318.             rwlock_write_unlock( & arp_globals.lock );
  319.             free( device->addr );
  320.             free( device->addr_data );
  321.             arp_protos_destroy( & device->protos );
  322.             free( device );
  323.             return ERROR_CODE;
  324.         }
  325.         if( ERROR_OCCURRED( arp_cache_add( & arp_globals.cache, device->device_id, device ))){
  326.             rwlock_write_unlock( & arp_globals.lock );
  327.             free( device->addr );
  328.             free( device->addr_data );
  329.             free( device->broadcast_addr );
  330.             free( device->broadcast_data );
  331.             arp_protos_destroy( & device->protos );
  332.             free( device );
  333.             return ERROR_CODE;
  334.         }
  335.         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 );
  336.     }
  337.     rwlock_write_unlock( & arp_globals.lock );
  338.     return EOK;
  339. }
  340.  
  341. measured_string_ref arp_translate_message( device_id_t device_id, services_t protocol, measured_string_ref target ){
  342.     arp_device_ref      device;
  343.     arp_proto_ref       proto;
  344.     measured_string_ref addr;
  345.     size_t              length;
  346.     packet_t            packet;
  347.     arp_header_ref      header;
  348.  
  349.     if( ! target ) return NULL;
  350.     device = arp_cache_find( & arp_globals.cache, device_id );
  351.     if( ! device ) return NULL;
  352.     proto = arp_protos_find( & device->protos, protocol );
  353.     if(( ! proto ) || ( proto->addr->length != target->length )) return NULL;
  354.     addr = arp_addr_find( & proto->addresses, target->value, target->length );
  355.     if( addr ) return addr;
  356.     // ARP packet content size = header + ( address + translation ) * 2
  357.     length = 8 + ( CONVERT_SIZE( char, uint8_t, proto->addr->length ) + CONVERT_SIZE( char, uint8_t, device->addr->length )) * 2;
  358.     if( length > device->content ) return NULL;
  359.     packet = packet_get_4( arp_globals.net_phone, device->addr_len, device->prefix, length, device->suffix );
  360.     if( ! packet ) return NULL;
  361.     header = ( arp_header_ref ) packet_suffix( packet, length );
  362.     if( ! header ){
  363.         pq_release( arp_globals.net_phone, packet_get_id( packet ));
  364.         return NULL;
  365.     }
  366.     header->hardware = htons( device->hardware );
  367.     header->hardware_length = ( uint8_t ) device->addr->length;
  368.     header->protocol = htons( protocol_map( device->service, protocol ));
  369.     header->protocol_length = ( uint8_t ) proto->addr->length;
  370.     header->operation = htons( ARPOP_REQUEST );
  371.     length = sizeof( arp_header_t );
  372.     memcpy((( uint8_t * ) header ) + length, device->addr->value, device->addr->length );
  373.     length += device->addr->length;
  374.     memcpy((( uint8_t * ) header ) + length, proto->addr->value, proto->addr->length );
  375.     length += proto->addr->length;
  376.     bzero((( uint8_t * ) header ) + length, device->addr->length );
  377.     length += device->addr->length;
  378.     memcpy((( uint8_t * ) header ) + length, target->value, target->length );
  379.     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 ){
  380.         pq_release( arp_globals.net_phone, packet_get_id( packet ));
  381.         return NULL;
  382.     }
  383.     nil_send_msg( device->phone, device_id, packet, SERVICE_ARP );
  384.     return NULL;
  385. }
  386.  
  387. int arp_receive_message( device_id_t device_id, packet_t packet ){
  388.     ERROR_DECLARE;
  389.  
  390.     size_t              length;
  391.     arp_header_ref      header;
  392.     arp_device_ref      device;
  393.     arp_proto_ref       proto;
  394.     measured_string_ref hw_source;
  395.     uint8_t *           src_hw;
  396.     uint8_t *           src_proto;
  397.     uint8_t *           des_hw;
  398.     uint8_t *           des_proto;
  399.  
  400.     length = packet_get_data_length( packet );
  401.     if( length <= sizeof( arp_header_t )) return EINVAL;
  402.     device = arp_cache_find( & arp_globals.cache, device_id );
  403.     if( ! device ) return ENOENT;
  404.     header = ( arp_header_ref ) packet_get_data( packet );
  405.     if(( ntohs( header->hardware ) != device->hardware )
  406.     // TODO how remove conversion from int '2' to uint?
  407.     || ( length < sizeof( arp_header_t ) + ( header->hardware_length + header->protocol_length ) * 2u )){
  408.         return EINVAL;
  409.     }
  410.     proto = arp_protos_find( & device->protos, protocol_unmap( device->service, ntohs( header->protocol )));
  411.     if( ! proto ) return ENOENT;
  412.     src_hw = (( uint8_t * ) header ) + sizeof( arp_header_t );
  413.     src_proto = src_hw + header->hardware_length;
  414.     des_hw = src_proto + header->protocol_length;
  415.     des_proto = des_hw + header->hardware_length;
  416.     hw_source = arp_addr_find( & proto->addresses, ( char * ) src_proto, CONVERT_SIZE( uint8_t, char, header->protocol_length ));
  417.     // exists?
  418.     if( hw_source ){
  419.         if( hw_source->length != CONVERT_SIZE( uint8_t, char, header->hardware_length )){
  420.             return EINVAL;
  421.         }
  422.         memcpy( hw_source->value, src_hw, hw_source->length );
  423.     }
  424.     // is my protocol address?
  425.     if( proto->addr->length != CONVERT_SIZE( uint8_t, char, header->protocol_length )){
  426.         return EINVAL;
  427.     }
  428.     if( ! str_lcmp( proto->addr->value, ( char * ) des_proto, proto->addr->length )){
  429.         // not already upadted?
  430.         if( ! hw_source ){
  431.             hw_source = measured_string_create_bulk(( char * ) src_hw, CONVERT_SIZE( uint8_t, char, header->hardware_length ));
  432.             if( ! hw_source ) return ENOMEM;
  433.             ERROR_PROPAGATE( arp_addr_add( & proto->addresses, ( char * ) src_proto, CONVERT_SIZE( uint8_t, char, header->protocol_length ), hw_source ));
  434.         }
  435.         if( ntohs( header->operation ) == ARPOP_REQUEST ){
  436.             header->operation = htons( ARPOP_REPLY );
  437.             memcpy( des_proto, src_proto, header->protocol_length );
  438.             memcpy( src_proto, proto->addr->value, header->protocol_length );
  439.             memcpy( src_hw, device->addr->value, device->addr_len );
  440.             memcpy( des_hw, hw_source->value, header->hardware_length );
  441.             ERROR_PROPAGATE( packet_set_addr( packet, src_hw, des_hw, header->hardware_length ));
  442.             nil_send_msg( device->phone, device_id, packet, SERVICE_ARP );
  443.             return 1;
  444.         }
  445.     }
  446.     return EOK;
  447. }
  448.  
  449. void clear_device( arp_device_ref device ){
  450.     int             count;
  451.     arp_proto_ref   proto;
  452.  
  453.     for( count = arp_protos_count( & device->protos ) - 1; count >= 0; -- count ){
  454.         proto = arp_protos_get_index( & device->protos, count );
  455.         if( proto ){
  456.             if( proto->addr ) free( proto->addr );
  457.             if( proto->addr_data ) free( proto->addr_data );
  458.             arp_addr_destroy( & proto->addresses );
  459.         }
  460.     }
  461.     arp_protos_clear( & device->protos );
  462. }
  463.  
  464. int arp_connect_module( services_t service ){
  465.     return EOK;
  466. }
  467.  
  468. int arp_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
  469.     ERROR_DECLARE;
  470.  
  471.     measured_string_ref address;
  472.     measured_string_ref translation;
  473.     char *              data;
  474.     packet_t            packet;
  475.     packet_t            next;
  476.  
  477. //  printf( "message %d - %d\n", IPC_GET_METHOD( * call ), NET_ARP_FIRST );
  478.     * answer_count = 0;
  479.     switch( IPC_GET_METHOD( * call )){
  480.         case IPC_M_PHONE_HUNGUP:
  481.             return EOK;
  482.         case NET_ARP_DEVICE:
  483.             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
  484.             if( ERROR_OCCURRED( arp_device_message( IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), ARP_GET_NETIF( call ), address ))){
  485.                 free( address );
  486.                 free( data );
  487.             }
  488.             return ERROR_CODE;
  489.         case NET_ARP_TRANSLATE:
  490.             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
  491.             rwlock_read_lock( & arp_globals.lock );
  492.             translation = arp_translate_message( IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), address );
  493.             free( address );
  494.             free( data );
  495.             if( ! translation ){
  496.                 rwlock_read_unlock( & arp_globals.lock );
  497.                 return ENOENT;
  498.             }
  499.             ERROR_CODE = measured_strings_reply( translation, 1 );
  500.             rwlock_read_unlock( & arp_globals.lock );
  501.             return ERROR_CODE;
  502.         case NET_ARP_CLEAR_DEVICE:
  503.             return arp_clear_device_req( 0, IPC_GET_DEVICE( call ));
  504.         case NET_ARP_CLEAN_CACHE:
  505.             return arp_clean_cache_req( 0 );
  506.         case NET_IL_DEVICE_STATE:
  507.             // do nothing - keep the cache
  508.             return EOK;
  509.         case NET_IL_RECEIVED:
  510.             if( ! ERROR_OCCURRED( packet_translate( arp_globals.net_phone, & packet, IPC_GET_PACKET( call )))){
  511.                 rwlock_read_lock( & arp_globals.lock );
  512.                 do{
  513.                     next = pq_detach( packet );
  514.                     ERROR_CODE = arp_receive_message( IPC_GET_DEVICE( call ), packet );
  515.                     if( ERROR_CODE != 1 ) pq_release( arp_globals.net_phone, packet_get_id( packet ));
  516.                     packet = next;
  517.                 }while( packet );
  518.                 rwlock_read_unlock( & arp_globals.lock );
  519.             }
  520.             return ERROR_CODE;
  521.     }
  522.     return ENOTSUP;
  523. }
  524.  
  525. /** @}
  526.  */
  527.