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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 eth
  30.  *  @{
  31.  */
  32.  
  33. /** @file
  34.  *  Ethernet module implementation.
  35.  *  @see eth.h
  36.  */
  37.  
  38. #include <async.h>
  39. #include <malloc.h>
  40. #include <mem.h>
  41. #include <stdio.h>
  42.  
  43. #include <ipc/ipc.h>
  44. #include <ipc/services.h>
  45.  
  46. #include "../../err.h"
  47. #include "../../messages.h"
  48. #include "../../modules.h"
  49.  
  50. #include "../../include/byteorder.h"
  51. #include "../../include/crc.h"
  52. #include "../../include/ethernet_lsap.h"
  53. #include "../../include/ethernet_protocols.h"
  54. #include "../../include/protocol_map.h"
  55. #include "../../include/device.h"
  56. #include "../../include/netif_messages.h"
  57.  
  58. #include "../../structures/measured_strings.h"
  59. #include "../../structures/packet/packet.h"
  60. #include "../../structures/packet/packet_client.h"
  61.  
  62. #include "eth.h"
  63. #include "eth_header.h"
  64. //#include "eth_messages.h"
  65. #include "eth_module.h"
  66.  
  67. #define ETH_PREFIX      ( sizeof( eth_header_t ) + sizeof( eth_header_lsap_t ) + sizeof( eth_header_snap_t ))
  68. #define ETH_SUFFIX      sizeof( eth_fcs_t )
  69. #define ETH_MAX_CONTENT 1500
  70. #define ETH_MIN_CONTENT 46
  71. #define ETH_MAX_TAGGED_CONTENT  ( ETH_MAX_CONTENT - sizeof( eth_header_lsap_t ) - sizeof( eth_header_snap_t ))
  72. #define ETH_MIN_TAGGED_CONTENT  ( ETH_MIN_CONTENT - sizeof( eth_header_lsap_t ) - sizeof( eth_header_snap_t ))
  73.  
  74. /** Returns the device identifier message parameter.
  75.  */
  76. #define IPC_GET_DEVICE( call )      ( device_id_t ) IPC_GET_ARG1( * call )
  77.  
  78. /** Returns the packet identifier message parameter.
  79.  */
  80. #define IPC_GET_PACKET( call )      ( packet_id_t ) IPC_GET_ARG2( * call )
  81.  
  82. #define IPC_GET_STATE( call )       ( device_state_t ) IPC_GET_ARG2( * call )
  83.  
  84. /** Returns the protocol service message parameter.
  85.  */
  86. #define IPC_GET_PROTO( call )       ( services_t ) IPC_GET_ARG2( * call )
  87.  
  88. /** Returns the device driver service message parameter.
  89.  */
  90. #define IPC_GET_SERVICE( call )     ( services_t ) IPC_GET_ARG3( * call )
  91.  
  92. #define IPC_GET_MTU( call )         ( size_t ) IPC_GET_ARG2( * call )
  93.  
  94. #define IPC_GET_PHONE( call )       ( int ) IPC_GET_ARG5( * call )
  95.  
  96. #define IPC_SET_ADDR( answer )      (( size_t * ) & IPC_GET_ARG1( * answer ))
  97. #define IPC_SET_PREFIX( answer )    (( size_t * ) & IPC_GET_ARG2( * answer ))
  98. #define IPC_SET_CONTENT( answer )   (( size_t * ) & IPC_GET_ARG3( * answer ))
  99. #define IPC_SET_SUFFIX( answer )    (( size_t * ) & IPC_GET_ARG4( * answer ))
  100.  
  101. typedef enum eth_addr_type  eth_addr_type_t;
  102. typedef eth_addr_type_t *   eth_addr_type_ref;
  103.  
  104. enum eth_addr_type{
  105.     ETH_LOCAL_ADDR,
  106.     ETH_BROADCAST_ADDR
  107. };
  108.  
  109. /** Ethernet global data.
  110.  */
  111. eth_globals_t   eth_globals;
  112.  
  113. /** Processes IPC messages from the registered device driver modules in an infinite loop.
  114.  *  @param iid The message identifier. Input parameter.
  115.  *  @param icall The message parameters. Input/output parameter.
  116.  */
  117. void    eth_receiver( ipc_callid_t iid, ipc_call_t * icall );
  118.  
  119. DEVICE_MAP_IMPLEMENT( eth_devices, eth_device_t )
  120.  
  121. INT_MAP_IMPLEMENT( eth_protos, eth_proto_t )
  122.  
  123. int eth_device_message( device_id_t device_id, services_t service, size_t mtu );
  124. int eth_receive_message( device_id_t device_id, packet_t packet );
  125. int eth_packet_space_message( device_id_t device_id, size_t * addr_len, size_t * prefix, size_t * content, size_t * suffix );
  126. int eth_addr_message( device_id_t device_id, eth_addr_type_t type, measured_string_ref * address );
  127. int eth_register_message( services_t service, int phone );
  128. int eth_send_message( device_id_t device_id, packet_t packet, services_t sender );
  129. void    eth_receiver( ipc_callid_t iid, ipc_call_t * icall );
  130. eth_proto_ref   eth_process_packet( int dummy, packet_t packet );
  131. int eth_prepare_packet( int dummy, packet_t packet, uint8_t * src_addr, int ethertype );
  132.  
  133. int eth_initialize( void ){
  134.     ERROR_DECLARE;
  135.  
  136.     rwlock_initialize( & eth_globals.devices_lock );
  137.     rwlock_initialize( & eth_globals.protos_lock );
  138.     rwlock_write_lock( & eth_globals.devices_lock );
  139.     rwlock_write_lock( & eth_globals.protos_lock );
  140.     eth_globals.broadcast_addr = measured_string_create_bulk( "\xFF\xFF\xFF\xFF\xFF\xFF", CONVERT_SIZE( uint8_t, char, ETH_ADDR ));
  141.     if( ! eth_globals.broadcast_addr ) return ENOMEM;
  142.     ERROR_PROPAGATE( eth_devices_initialize( & eth_globals.devices ));
  143.     if( ERROR_OCCURRED( eth_protos_initialize( & eth_globals.protos ))){
  144.         eth_devices_destroy( & eth_globals.devices );
  145.         return ERROR_CODE;
  146.     }
  147.     rwlock_write_unlock( & eth_globals.protos_lock );
  148.     rwlock_write_unlock( & eth_globals.devices_lock );
  149.     return EOK;
  150. }
  151.  
  152. int eth_device_message( device_id_t device_id, services_t service, size_t mtu ){
  153.     ERROR_DECLARE;
  154.  
  155.     eth_device_ref  device;
  156.     int             index;
  157.  
  158.     rwlock_write_lock( & eth_globals.devices_lock );
  159.     // an existing device?
  160.     device = eth_devices_find( & eth_globals.devices, device_id );
  161.     if( device ){
  162.         if( device->service != service ){
  163.             printf( "\nDevice %d already exists", device->device_id );
  164.             rwlock_write_unlock( & eth_globals.devices_lock );
  165.             return EEXIST;
  166.         }else{
  167.             // update mtu
  168.             device->mtu = mtu;
  169.             printf( "\nDevice %d already exists:\tMTU\t= %d", device->device_id, device->mtu );
  170.         }
  171.     }else{
  172.         // create a new device
  173.         device = ( eth_device_ref ) malloc( sizeof( eth_device_t ));
  174.         if( ! device ) return ENOMEM;
  175.         device->device_id = device_id;
  176.         device->service = service;
  177.         device->mtu = (( mtu > 0 ) && ( mtu <= ETH_MAX_TAGGED_CONTENT )) ? mtu : ETH_MAX_TAGGED_CONTENT;
  178.         // TODO get dummy setting
  179.         device->dummy = 0;
  180.         // bind the device driver
  181.         device->phone = bind_service( device->service, device->device_id, SERVICE_ETHERNET, 0, eth_receiver );
  182.         if( device->phone < 0 ){
  183.             rwlock_write_unlock( & eth_globals.devices_lock );
  184.             free( device );
  185.             return device->phone;
  186.         }
  187.         // get hardware address
  188.         if( ERROR_OCCURRED( netif_get_addr( device->phone, device->device_id, & device->addr, & device->addr_data ))){
  189.             rwlock_write_unlock( & eth_globals.devices_lock );
  190.             free( device );
  191.             return ERROR_CODE;
  192.         }
  193.         // add to the cache
  194.         index = eth_devices_add( & eth_globals.devices, device->device_id, device );
  195.         if( index < 0 ){
  196.             rwlock_write_unlock( & eth_globals.devices_lock );
  197.             free( device->addr );
  198.             free( device->addr_data );
  199.             free( device );
  200.             return index;
  201.         }
  202.         printf( "\nNew device registered:\n\tid\t= %d\n\tservice\t= %d\n\tMTU\t= %d\n\taddress\t= %X:%X:%X:%X:%X:%X", device->device_id, device->service, device->mtu, device->addr_data[ 0 ], device->addr_data[ 1 ], device->addr_data[ 2 ], device->addr_data[ 3 ], device->addr_data[ 4 ], device->addr_data[ 5 ] );
  203.     }
  204.     rwlock_write_unlock( & eth_globals.devices_lock );
  205.     return EOK;
  206. }
  207.  
  208. eth_proto_ref eth_process_packet( int dummy, packet_t packet ){
  209.     ERROR_DECLARE;
  210.  
  211.     eth_header_ex_ref   header;
  212.     size_t              length;
  213.     int                 type;
  214.     size_t              prefix;
  215.     size_t              suffix;
  216.     eth_fcs_ref         fcs;
  217.  
  218.     length = packet_get_data_length( packet );
  219.     if( dummy ){
  220.         packet_trim( packet, sizeof( eth_preamble_t ), 0 );
  221.     }
  222.     if( length <= sizeof( eth_header_t ) + ETH_MIN_CONTENT + ETH_SUFFIX ) return NULL;
  223.     header = ( eth_header_ex_ref ) packet_get_data( packet );
  224.     type = ntohs( header->header.ethertype );
  225.     if( type >= ETH_MIN_PROTO ){
  226.         // DIX Ethernet
  227.         prefix = sizeof( eth_header_t );
  228.         suffix = sizeof( eth_fcs_t );
  229.         fcs = (( void * ) header ) + length - suffix;
  230.     }else if( type <= ETH_MAX_CONTENT ){
  231.         // translate "LSAP" values
  232.         if(( header->lsap.dsap == ETH_LSAP_GLSAP ) && ( header->lsap.ssap == ETH_LSAP_GLSAP )){
  233.             // raw packet
  234.             // discard
  235.             return NULL;
  236.         }else if(( header->lsap.dsap == ETH_LSAP_SNAP ) && ( header->lsap.ssap == ETH_LSAP_SNAP )){
  237.             // IEEE 802.3 + 802.2 + LSAP + SNAP
  238.             // organization code not supported
  239.             type = ntohs( header->snap.ethertype );
  240.             prefix = sizeof( eth_header_t ) + sizeof( eth_header_lsap_t ) + sizeof( eth_header_snap_t );
  241.         }else{
  242.             // IEEE 802.3 + 802.2 LSAP
  243.             type = lsap_map( header->lsap.dsap );
  244.             prefix = sizeof( eth_header_t ) + sizeof( eth_header_lsap_t);
  245.         }
  246.         suffix = ( type < ETH_MIN_CONTENT ) ? ETH_MIN_CONTENT - type : 0;
  247.         fcs = (( void * ) header ) + prefix + type + suffix;
  248.         suffix += length - prefix - type;
  249.     }else{
  250.         // invalid length/type, should not occurr
  251.         return NULL;
  252.     }
  253.     if( dummy ){
  254.         if(( ~ compute_crc32( ~ 0, & header->header.dest, ((( void * ) fcs ) - (( void * ) & header->header.dest )) * 8 )) != ntohl( * fcs )){
  255.             return NULL;
  256.         }
  257.     }
  258.     if( ERROR_OCCURRED( packet_set_addr( packet, header->header.src, header->header.dest, ETH_ADDR ))
  259.     || ERROR_OCCURRED( packet_trim( packet, prefix, suffix ))){
  260.         return NULL;
  261.     }
  262.     return eth_protos_find( & eth_globals.protos, type );
  263. }
  264.  
  265. int eth_receive_message( device_id_t device_id, packet_t packet ){
  266.     eth_proto_ref   proto;
  267.     packet_t        next;
  268.     eth_device_ref  device;
  269.     int             dummy;
  270.  
  271.     rwlock_read_lock( & eth_globals.devices_lock );
  272.     device = eth_devices_find( & eth_globals.devices, device_id );
  273.     if( ! device ){
  274.         rwlock_read_unlock( & eth_globals.devices_lock );
  275.         return ENOENT;
  276.     }
  277.     dummy = device->dummy;
  278.     rwlock_read_unlock( & eth_globals.devices_lock );
  279.     rwlock_read_lock( & eth_globals.protos_lock );
  280.     do{
  281.         next = pq_detach( packet );
  282.         proto = eth_process_packet( dummy, packet );
  283.         if( proto ){
  284.             async_msg_2( proto->phone, NET_IL_RECEIVED, device_id, packet_get_id( packet ));
  285.         }else{
  286.             // drop invalid/unknown
  287.             pq_release( eth_globals.networking_phone, packet_get_id( packet ));
  288.         }
  289.         packet = next;
  290.     }while( packet );
  291.     rwlock_read_unlock( & eth_globals.protos_lock );
  292.     return EOK;
  293. }
  294.  
  295. int eth_packet_space_message( device_id_t device_id, size_t * addr_len, size_t * prefix, size_t * content, size_t * suffix ){
  296.     eth_device_ref  device;
  297.  
  298.     if( !( addr_len && prefix && content && suffix )) return EINVAL;
  299.     rwlock_read_lock( & eth_globals.devices_lock );
  300.     device = eth_devices_find( & eth_globals.devices, device_id );
  301.     if( ! device ){
  302.         rwlock_read_unlock( & eth_globals.devices_lock );
  303.         return ENOENT;
  304.     }
  305.     * content = device->mtu;
  306.     rwlock_read_unlock( & eth_globals.devices_lock );
  307.     * addr_len = ETH_ADDR;
  308.     * prefix = ETH_PREFIX;
  309.     * suffix = ETH_MIN_CONTENT + ETH_SUFFIX;
  310.     return EOK;
  311. }
  312.  
  313. int eth_addr_message( device_id_t device_id, eth_addr_type_t type, measured_string_ref * address ){
  314.     eth_device_ref  device;
  315.  
  316.     if( ! address ) return EINVAL;
  317.     if( type == ETH_BROADCAST_ADDR ){
  318.         * address = eth_globals.broadcast_addr;
  319.     }else{
  320.         rwlock_read_lock( & eth_globals.devices_lock );
  321.         device = eth_devices_find( & eth_globals.devices, device_id );
  322.         if( ! device ){
  323.             rwlock_read_unlock( & eth_globals.devices_lock );
  324.             return ENOENT;
  325.         }
  326.         * address = device->addr;
  327.         rwlock_read_unlock( & eth_globals.devices_lock );
  328.     }
  329.     return ( * address ) ? EOK : ENOENT;
  330. }
  331.  
  332. int eth_register_message( services_t service, int phone ){
  333.     eth_proto_ref   proto;
  334.     int             protocol;
  335.     int             index;
  336.  
  337.     protocol = protocol_map( SERVICE_ETHERNET, service );
  338.     if( ! protocol ) return ENOENT;
  339.     rwlock_write_lock( & eth_globals.protos_lock );
  340.     proto = eth_protos_find( & eth_globals.protos, protocol );
  341.     if( proto ){
  342.         proto->phone = phone;
  343.         rwlock_write_unlock( & eth_globals.protos_lock );
  344.         return EOK;
  345.     }else{
  346.         proto = ( eth_proto_ref ) malloc( sizeof( eth_proto_t ));
  347.         if( ! proto ){
  348.             rwlock_write_unlock( & eth_globals.protos_lock );
  349.             return ENOMEM;
  350.         }
  351.         proto->service = service;
  352.         proto->protocol = protocol;
  353.         proto->phone = phone;
  354.         index = eth_protos_add( & eth_globals.protos, protocol, proto );
  355.         if( index < 0 ){
  356.             rwlock_write_unlock( & eth_globals.protos_lock );
  357.             free( proto );
  358.             return index;
  359.         }
  360.     }
  361.     printf( "\nNew protocol registered:\n\tprotocol\t= 0x%x\n\tservice\t= %d\n\tphone\t= %d", proto->protocol, proto->service, proto->phone );
  362.     rwlock_write_unlock( & eth_globals.protos_lock );
  363.     return EOK;
  364. }
  365.  
  366. int eth_prepare_packet( int dummy, packet_t packet, uint8_t * src_addr, int ethertype ){
  367.     eth_header_ex_ref   header;
  368.     eth_fcs_ref         fcs;
  369.     uint8_t *           src;
  370.     uint8_t *           dest;
  371.     int                 length;
  372.     int                 i;
  373.     void *              padding;
  374.     eth_preamble_ref    preamble;
  375.  
  376.     length = packet_get_data_length( packet );
  377.     if( length > ETH_MAX_TAGGED_CONTENT ) return EINVAL;
  378.     if( length < ETH_MIN_TAGGED_CONTENT ){
  379.         padding = packet_suffix( packet, ETH_MIN_TAGGED_CONTENT - length );
  380.         if( ! padding ) return ENOMEM;
  381.         bzero( padding, ETH_MIN_TAGGED_CONTENT - length );
  382.     }
  383.     if( dummy ){
  384.         preamble = PACKET_PREFIX( packet, eth_preamble_t );
  385.         if( ! preamble ) return ENOMEM;
  386.         for( i = 0; i < 7; ++ i ) preamble->preamble[ i ] = ETH_PREAMBLE;
  387.         preamble->sfd = ETH_SFD;
  388.     }
  389.     header = PACKET_PREFIX( packet, eth_header_ex_t );
  390.     if( ! header ) return ENOMEM;
  391.     header->header.ethertype = htons( length + sizeof( eth_header_lsap_t ) + sizeof( eth_header_snap_t ));
  392.     header->lsap.dsap = 0xAA;
  393.     header->lsap.ssap = header->lsap.dsap;
  394.     header->lsap.ctrl = 0;
  395.     for( i = 0; i < 3; ++ i ) header->snap.proto[ i ] = 0;
  396.     header->snap.ethertype = ethertype;
  397.     length = packet_get_addr( packet, & src, & dest );
  398.     if( length < 0 ) return length;
  399.     if( length < ETH_ADDR ) return EINVAL;
  400.     memcpy( header->header.src, src_addr, ETH_ADDR );
  401.     memcpy( header->header.dest, dest, ETH_ADDR );
  402.     if( dummy ){
  403.         fcs = PACKET_SUFFIX( packet, eth_fcs_t );
  404.         if( ! fcs ) return ENOMEM;
  405.         * fcs = htonl( ~ compute_crc32( ~ 0, & header->header.dest, ((( void * ) fcs ) - (( void * ) & header->header.dest )) * 8 ));
  406.     }
  407.     return EOK;
  408. }
  409.  
  410. int eth_send_message( device_id_t device_id, packet_t packet, services_t sender ){
  411.     ERROR_DECLARE;
  412.  
  413.     eth_device_ref      device;
  414.     packet_t            next;
  415.     packet_t            tmp;
  416.     int                 ethertype;
  417.  
  418.     ethertype = htons( protocol_map( SERVICE_ETHERNET, sender ));
  419.     if( ! ethertype ){
  420.         pq_release( eth_globals.networking_phone, packet_get_id( packet ));
  421.         return EINVAL;
  422.     }
  423.     rwlock_read_lock( & eth_globals.devices_lock );
  424.     device = eth_devices_find( & eth_globals.devices, device_id );
  425.     if( ! device ){
  426.         rwlock_read_unlock( & eth_globals.devices_lock );
  427.         return ENOENT;
  428.     }
  429.     // process packet queue
  430.     next = packet;
  431.     do{
  432.         if( ERROR_OCCURRED( eth_prepare_packet( device->dummy, next, ( uint8_t * ) device->addr->value, ethertype ))){
  433.             // release invalid packet
  434.             tmp = pq_detach( next );
  435.             pq_release( eth_globals.networking_phone, packet_get_id( next ));
  436.             next = tmp;
  437.         }else{
  438.             next = pq_next( next );
  439.         }
  440.     }while( next );
  441.     // send packet queue
  442.     netif_send_msg( device->phone, device_id, packet );
  443.     rwlock_read_unlock( & eth_globals.devices_lock );
  444.     return EOK;
  445. }
  446.  
  447. int eth_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
  448.     ERROR_DECLARE;
  449.  
  450.     measured_string_ref address;
  451.     packet_t            packet;
  452.  
  453. //  printf( "\nmessage %d - %d", IPC_GET_METHOD( * call ), NET_NIL_FIRST );
  454.     * answer_count = 0;
  455.     switch( IPC_GET_METHOD( * call )){
  456.         case IPC_M_PHONE_HUNGUP:
  457.             return EOK;
  458.         case NET_NIL_DEVICE:
  459.             return eth_device_message( IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), IPC_GET_MTU( call ));
  460.         case NET_NIL_SEND:
  461.             ERROR_PROPAGATE( packet_translate( eth_globals.networking_phone, & packet, IPC_GET_PACKET( call )));
  462.             return eth_send_message( IPC_GET_DEVICE( call ), packet, IPC_GET_SERVICE( call ));
  463.         case NET_NIL_PACKET_SPACE:
  464.             ERROR_PROPAGATE( eth_packet_space_message( IPC_GET_DEVICE( call ), IPC_SET_ADDR( answer ), IPC_SET_PREFIX( answer ), IPC_SET_CONTENT( answer ), IPC_SET_SUFFIX( answer )));
  465.             * answer_count = 3;
  466.             return EOK;
  467.         case NET_NIL_ADDR:
  468.             ERROR_PROPAGATE( eth_addr_message( IPC_GET_DEVICE( call ), ETH_LOCAL_ADDR, & address ));
  469.             return measured_strings_reply( address, 1 );
  470.         case NET_NIL_BROADCAST_ADDR:
  471.             ERROR_PROPAGATE( eth_addr_message( IPC_GET_DEVICE( call ), ETH_BROADCAST_ADDR, & address ));
  472.             return measured_strings_reply( address, 1 );
  473.         case IPC_M_CONNECT_TO_ME:
  474.             return eth_register_message( IPC_GET_PROTO( call ), IPC_GET_PHONE( call ));
  475.     }
  476.     return ENOTSUP;
  477. }
  478.  
  479. void eth_receiver( ipc_callid_t iid, ipc_call_t * icall ){
  480.     ERROR_DECLARE;
  481.  
  482.     packet_t        packet;
  483.     int             index;
  484.     eth_proto_ref   proto;
  485.  
  486.     while( true ){
  487.         switch( IPC_GET_METHOD( * icall )){
  488.             case NET_NIL_DEVICE_STATE:
  489.                 //TODO clear device if off?
  490.                 rwlock_read_lock( & eth_globals.protos_lock );
  491.                 for( index = eth_protos_count( & eth_globals.protos ) - 1; index >= 0; -- index ){
  492.                     proto = eth_protos_get_index( & eth_globals.protos, index );
  493.                     if( proto && proto->phone ) async_msg_2( proto->phone, NET_IL_DEVICE_STATE, IPC_GET_DEVICE( icall ), IPC_GET_STATE( icall ));
  494.                 }
  495.                 rwlock_read_unlock( & eth_globals.protos_lock );
  496.                 ipc_answer_0( iid, EOK );
  497.                 break;
  498.             case NET_NIL_RECEIVED:
  499.                 if( ! ERROR_OCCURRED( packet_translate( eth_globals.networking_phone, & packet, IPC_GET_PACKET( icall )))){
  500.                     ERROR_CODE = eth_receive_message( IPC_GET_DEVICE( icall ), packet );
  501.                 }
  502.                 ipc_answer_0( iid, ERROR_CODE );
  503.                 break;
  504.             default:
  505.                 ipc_answer_0( iid, ENOTSUP );
  506.         }
  507.         iid = async_get_call( icall );
  508.     }
  509. }
  510.  
  511. /** @}
  512.  */
  513.