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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. #include <string.h>
  43.  
  44. #include <ipc/ipc.h>
  45. #include <ipc/services.h>
  46.  
  47. #include "../../err.h"
  48. #include "../../messages.h"
  49. #include "../../modules.h"
  50.  
  51. #include "../../include/byteorder.h"
  52. #include "../../include/crc.h"
  53. #include "../../include/ethernet_lsap.h"
  54. #include "../../include/ethernet_protocols.h"
  55. #include "../../include/protocol_map.h"
  56. #include "../../include/device.h"
  57. #include "../../include/netif_interface.h"
  58. #include "../../include/net_interface.h"
  59. #include "../../include/nil_interface.h"
  60. #include "../../include/il_interface.h"
  61.  
  62. #include "../../structures/measured_strings.h"
  63. #include "../../structures/packet/packet_client.h"
  64.  
  65. #include "../nil_module.h"
  66.  
  67. #include "eth.h"
  68. #include "eth_header.h"
  69.  
  70. /** Reserved packet prefix length.
  71.  */
  72. #define ETH_PREFIX      ( sizeof( eth_header_t ) + sizeof( eth_header_lsap_t ) + sizeof( eth_header_snap_t ))
  73.  
  74. /** Reserved packet suffix length.
  75.  */
  76. #define ETH_SUFFIX      sizeof( eth_fcs_t )
  77.  
  78. /** Maximum packet content length.
  79.  */
  80. #define ETH_MAX_CONTENT 1500
  81.  
  82. /** Minimum packet content length.
  83.  */
  84. #define ETH_MIN_CONTENT 46u
  85.  
  86. /** Maximum tagged packet content length.
  87.  */
  88. #define ETH_MAX_TAGGED_CONTENT( flags ) ( ETH_MAX_CONTENT - (( IS_8023_2_LSAP( flags ) || IS_8023_2_SNAP( flags )) ? sizeof( eth_header_lsap_t ) : 0 ) - ( IS_8023_2_SNAP( flags ) ? sizeof( eth_header_snap_t ) : 0 ))
  89.  
  90. /** Minimum tagged packet content length.
  91.  */
  92. #define ETH_MIN_TAGGED_CONTENT( flags ) ( ETH_MIN_CONTENT - (( IS_8023_2_LSAP( flags ) || IS_8023_2_SNAP( flags )) ? sizeof( eth_header_lsap_t ) : 0 ) - ( IS_8023_2_SNAP( flags ) ? sizeof( eth_header_snap_t ) : 0 ))
  93.  
  94. /** Dummy flag shift value.
  95.  */
  96. #define ETH_DUMMY_SHIFT 0
  97.  
  98. /** Mode flag shift value.
  99.  */
  100. #define ETH_MODE_SHIFT  1
  101.  
  102. /** Dummy device flag.
  103.  *  Preamble and FCS are mandatory part of the packets.
  104.  */
  105. #define ETH_DUMMY               ( 1 << ETH_DUMMY_SHIFT )
  106.  
  107. /** Returns the dummy flag.
  108.  *  @see ETH_DUMMY
  109.  */
  110. #define IS_DUMMY( flags )       (( flags ) & ETH_DUMMY )
  111.  
  112. /** Device mode flags.
  113.  *  @see ETH_DIX
  114.  *  @see ETH_8023_2_LSAP
  115.  *  @see ETH_8023_2_SNAP
  116.  */
  117. #define ETH_MODE_MASK           ( 3 << ETH_MODE_SHIFT )
  118.  
  119. /** DIX Ethernet mode flag.
  120.  */
  121. #define ETH_DIX                 ( 1 << ETH_MODE_SHIFT )
  122.  
  123. /** Returns whether the DIX Ethernet mode flag is set.
  124.  *  @param flags The ethernet flags. Input parameter.
  125.  *  @see ETH_DIX
  126.  */
  127. #define IS_DIX( flags )         ((( flags ) & ETH_MODE_MASK ) == ETH_DIX )
  128.  
  129. /** 802.3 + 802.2 + LSAP mode flag.
  130.  */
  131. #define ETH_8023_2_LSAP         ( 2 << ETH_MODE_SHIFT )
  132.  
  133. /** Returns whether the 802.3 + 802.2 + LSAP mode flag is set.
  134.  *  @param flags The ethernet flags. Input parameter.
  135.  *  @see ETH_8023_2_LSAP
  136.  */
  137. #define IS_8023_2_LSAP( flags ) ((( flags ) & ETH_MODE_MASK ) == ETH_8023_2_LSAP )
  138.  
  139. /** 802.3 + 802.2 + LSAP + SNAP mode flag.
  140.  */
  141. #define ETH_8023_2_SNAP         ( 3 << ETH_MODE_SHIFT )
  142.  
  143. /** Returns whether the 802.3 + 802.2 + LSAP + SNAP mode flag is set.
  144.  *  @param flags The ethernet flags. Input parameter.
  145.  *  @see ETH_8023_2_SNAP
  146.  */
  147. #define IS_8023_2_SNAP( flags ) ((( flags ) & ETH_MODE_MASK ) == ETH_8023_2_SNAP )
  148.  
  149. /** Type definition of the ethernet address type.
  150.  *  @see eth_addr_type
  151.  */
  152. typedef enum eth_addr_type  eth_addr_type_t;
  153.  
  154. /** Type definition of the ethernet address type pointer.
  155.  *  @see eth_addr_type
  156.  */
  157. typedef eth_addr_type_t *   eth_addr_type_ref;
  158.  
  159. /** Ethernet address type.
  160.  */
  161. enum eth_addr_type{
  162.     /** Local address.
  163.      */
  164.     ETH_LOCAL_ADDR,
  165.     /** Broadcast address.
  166.      */
  167.     ETH_BROADCAST_ADDR
  168. };
  169.  
  170. /** Ethernet module global data.
  171.  */
  172. eth_globals_t   eth_globals;
  173.  
  174. /** Processes IPC messages from the registered device driver modules in an infinite loop.
  175.  *  @param iid The message identifier. Input parameter.
  176.  *  @param icall The message parameters. Input/output parameter.
  177.  */
  178. void    eth_receiver( ipc_callid_t iid, ipc_call_t * icall );
  179.  
  180. /** Registers new device or updates the MTU of an existing one.
  181.  *  Determines the device local hardware address.
  182.  *  @param device_id The new device identifier. Input parameter.
  183.  *  @param service The device driver service. Input parameter.
  184.  *  @param mtu The device maximum transmission unit. Input parameter.
  185.  *  @returns EOK on success.
  186.  *  @returns EEXIST if the device with the different service exists.
  187.  *  @returns ENOMEM if there is not enough memory left.
  188.  *  @returns Other error codes as defined for the net_get_device_conf_req() function.
  189.  *  @returns Other error codes as defined for the netif_bind_service() function.
  190.  *  @returns Other error codes as defined for the netif_get_addr() function.
  191.  */
  192. int eth_device_message( device_id_t device_id, services_t service, size_t mtu );
  193.  
  194. /** Registers receiving module service.
  195.  *  Passes received packets for this service.
  196.  *  @param service The module service. Input parameter.
  197.  *  @param phone The service phone. Input parameter.
  198.  *  @returns EOK on success.
  199.  *  @returns ENOENT if the service is not known.
  200.  *  @returns ENOMEM if there is not enough memory left.
  201.  */
  202. int eth_register_message( services_t service, int phone );
  203.  
  204. /** Returns the device packet dimensions for sending.
  205.  *  @param device_id The device identifier. Input parameter.
  206.  *  @param addr_len The minimum reserved address length. Output parameter.
  207.  *  @param prefix The minimum reserved prefix size. Output parameter.
  208.  *  @param content The maximum content size. Output parameter.
  209.  *  @param suffix The minimum reserved suffix size. Output parameter.
  210.  *  @returns EOK on success.
  211.  *  @returns EBADMEM if either one of the parameters is NULL.
  212.  *  @returns ENOENT if there is no such device.
  213.  */
  214. int eth_packet_space_message( device_id_t device_id, size_t * addr_len, size_t * prefix, size_t * content, size_t * suffix );
  215.  
  216. /** Returns the device hardware address.
  217.  *  @param device_id The device identifier. Input parameter.
  218.  *  @param type Type of the desired address. Input parameter
  219.  *  @param address The device hardware address. Output parameter.
  220.  *  @returns EOK on success.
  221.  *  @returns EBADMEM if the address parameter is NULL.
  222.  *  @returns ENOENT if there no such device.
  223.  */
  224. int eth_addr_message( device_id_t device_id, eth_addr_type_t type, measured_string_ref * address );
  225.  
  226. /** Sends the packet queue.
  227.  *  Sends only packet successfully processed by the eth_prepare_packet() function.
  228.  *  @param device_id The device identifier. Input parameter.
  229.  *  @param packet The packet queue. Input parameter.
  230.  *  @param sender The sending module service. Input parameter.
  231.  *  @returns EOK on success.
  232.  *  @returns ENOENT if there no such device.
  233.  *  @returns EINVAL if the service parameter is not known.
  234.  */
  235. int eth_send_message( device_id_t device_id, packet_t packet, services_t sender );
  236.  
  237. /** Processes the received packet and chooses the target registered module.
  238.  *  @param flags The device flags. Input parameter.
  239.  *  @param packet The packet. Input parameter.
  240.  *  @returns The target registered module.
  241.  *  @returns NULL if the packet is not long enough.
  242.  *  @returns NULL if the packet is too long.
  243.  *  @returns NULL if the raw ethernet protocol is used.
  244.  *  @returns NULL if the dummy device FCS checksum is invalid.
  245.  *  @returns NULL if the packet address length is not big enough.
  246.  */
  247. eth_proto_ref   eth_process_packet( int flags, packet_t packet );
  248.  
  249. /** Prepares the packet for sending.
  250.  *  @param flags The device flags. Input parameter.
  251.  *  @param packet The packet. Input parameter.
  252.  *  @param src_addr The source hardware address. Input parameter.
  253.  *  @param ethertype The ethernet protocol type. Input parameter.
  254.  *  @param mtu The device maximum transmission unit. Input parameter.
  255.  *  @returns EOK on success.
  256.  *  @returns EINVAL if the packet addresses length is not long enough.
  257.  *  @returns EINVAL if the packet is bigger than the device MTU.
  258.  *  @returns ENOMEM if there is not enough memory in the packet.
  259.  */
  260. int eth_prepare_packet( int flags, packet_t packet, uint8_t * src_addr, int ethertype, size_t mtu );
  261.  
  262. DEVICE_MAP_IMPLEMENT( eth_devices, eth_device_t )
  263.  
  264. INT_MAP_IMPLEMENT( eth_protos, eth_proto_t )
  265.  
  266. int nil_device_state_msg( int nil_phone, device_id_t device_id, int state ){
  267.     int             index;
  268.     eth_proto_ref   proto;
  269.  
  270.     //TODO clear device if off?
  271.     fibril_rwlock_read_lock( & eth_globals.protos_lock );
  272.     for( index = eth_protos_count( & eth_globals.protos ) - 1; index >= 0; -- index ){
  273.         proto = eth_protos_get_index( & eth_globals.protos, index );
  274.         if( proto && proto->phone ) il_device_state_msg( proto->phone, device_id, state, proto->service );
  275.     }
  276.     fibril_rwlock_read_unlock( & eth_globals.protos_lock );
  277.     return EOK;
  278. }
  279.  
  280. int nil_initialize( int net_phone ){
  281.     ERROR_DECLARE;
  282.  
  283.     fibril_rwlock_initialize( & eth_globals.devices_lock );
  284.     fibril_rwlock_initialize( & eth_globals.protos_lock );
  285.     fibril_rwlock_write_lock( & eth_globals.devices_lock );
  286.     fibril_rwlock_write_lock( & eth_globals.protos_lock );
  287.     eth_globals.net_phone = net_phone;
  288.     eth_globals.broadcast_addr = measured_string_create_bulk( "\xFF\xFF\xFF\xFF\xFF\xFF", CONVERT_SIZE( uint8_t, char, ETH_ADDR ));
  289.     if( ! eth_globals.broadcast_addr ) return ENOMEM;
  290.     ERROR_PROPAGATE( eth_devices_initialize( & eth_globals.devices ));
  291.     if( ERROR_OCCURRED( eth_protos_initialize( & eth_globals.protos ))){
  292.         eth_devices_destroy( & eth_globals.devices );
  293.         return ERROR_CODE;
  294.     }
  295.     fibril_rwlock_write_unlock( & eth_globals.protos_lock );
  296.     fibril_rwlock_write_unlock( & eth_globals.devices_lock );
  297.     return EOK;
  298. }
  299.  
  300. int eth_device_message( device_id_t device_id, services_t service, size_t mtu ){
  301.     ERROR_DECLARE;
  302.  
  303.     eth_device_ref  device;
  304.     int             index;
  305.     measured_string_t   names[ 2 ] = {{ "ETH_MODE", 8 }, { "ETH_DUMMY", 9 }};
  306.     measured_string_ref configuration;
  307.     size_t              count = sizeof( names ) / sizeof( measured_string_t );
  308.     char *              data;
  309.     eth_proto_ref       proto;
  310.  
  311.     fibril_rwlock_write_lock( & eth_globals.devices_lock );
  312.     // an existing device?
  313.     device = eth_devices_find( & eth_globals.devices, device_id );
  314.     if( device ){
  315.         if( device->service != service ){
  316.             printf( "Device %d already exists\n", device->device_id );
  317.             fibril_rwlock_write_unlock( & eth_globals.devices_lock );
  318.             return EEXIST;
  319.         }else{
  320.             // update mtu
  321.             device->mtu = mtu;
  322.             printf( "Device %d already exists:\tMTU\t= %d\n", device->device_id, device->mtu );
  323.             fibril_rwlock_write_unlock( & eth_globals.devices_lock );
  324.             // notify all upper layer modules
  325.             fibril_rwlock_read_lock( & eth_globals.protos_lock );
  326.             for( index = 0; index < eth_protos_count( & eth_globals.protos ); ++ index ){
  327.                 proto = eth_protos_get_index( & eth_globals.protos, index );
  328.                 if ( proto->phone ){
  329.                     il_mtu_changed_msg( proto->phone, device->device_id, device->mtu, proto->service );
  330.                 }
  331.             }
  332.             fibril_rwlock_read_unlock( & eth_globals.protos_lock );
  333.             return EOK;
  334.         }
  335.     }else{
  336.         // create a new device
  337.         device = ( eth_device_ref ) malloc( sizeof( eth_device_t ));
  338.         if( ! device ) return ENOMEM;
  339.         device->device_id = device_id;
  340.         device->service = service;
  341.         device->flags = 0;
  342.         device->mtu = (( mtu > 0 ) && ( mtu <= ETH_MAX_TAGGED_CONTENT( device->flags ))) ? mtu : ETH_MAX_TAGGED_CONTENT( device->flags );
  343.         configuration = & names[ 0 ];
  344.         if( ERROR_OCCURRED( net_get_device_conf_req( eth_globals.net_phone, device->device_id, & configuration, count, & data ))){
  345.             fibril_rwlock_write_unlock( & eth_globals.devices_lock );
  346.             free( device );
  347.             return ERROR_CODE;
  348.         }
  349.         if( configuration ){
  350.             if( ! str_lcmp( configuration[ 0 ].value, "DIX", configuration[ 0 ].length )){
  351.                 device->flags |= ETH_DIX;
  352.             }else if( ! str_lcmp( configuration[ 0 ].value, "8023_2_LSAP", configuration[ 0 ].length )){
  353.                 // TODO 8023_2_LSAP
  354.                 printf( "8023_2_LSAP is not supported (yet?), DIX used instead\n" );
  355.                 device->flags |= ETH_DIX;
  356.             }else device->flags |= ETH_8023_2_SNAP;
  357.             if(( configuration[ 1 ].value ) && ( configuration[ 1 ].value[ 0 ] == 'y' )){
  358.                 device->flags |= ETH_DUMMY;
  359.             }
  360.             net_free_settings( configuration, data );
  361.         }else{
  362.             device->flags |= ETH_8023_2_SNAP;
  363.         }
  364.         // bind the device driver
  365.         device->phone = netif_bind_service( device->service, device->device_id, SERVICE_ETHERNET, eth_receiver );
  366.         if( device->phone < 0 ){
  367.             fibril_rwlock_write_unlock( & eth_globals.devices_lock );
  368.             free( device );
  369.             return device->phone;
  370.         }
  371.         // get hardware address
  372.         if( ERROR_OCCURRED( netif_get_addr( device->phone, device->device_id, & device->addr, & device->addr_data ))){
  373.             fibril_rwlock_write_unlock( & eth_globals.devices_lock );
  374.             free( device );
  375.             return ERROR_CODE;
  376.         }
  377.         // add to the cache
  378.         index = eth_devices_add( & eth_globals.devices, device->device_id, device );
  379.         if( index < 0 ){
  380.             fibril_rwlock_write_unlock( & eth_globals.devices_lock );
  381.             free( device->addr );
  382.             free( device->addr_data );
  383.             free( device );
  384.             return index;
  385.         }
  386.         printf( "New device registered:\n\tid\t= %d\n\tservice\t= %d\n\tMTU\t= %d\n\taddress\t= %X:%X:%X:%X:%X:%X\n\tflags\t= 0x%x\n", 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 ], device->flags );
  387.     }
  388.     fibril_rwlock_write_unlock( & eth_globals.devices_lock );
  389.     return EOK;
  390. }
  391.  
  392. eth_proto_ref eth_process_packet( int flags, packet_t packet ){
  393.     ERROR_DECLARE;
  394.  
  395.     eth_header_ex_ref   header;
  396.     size_t              length;
  397.     eth_type_t          type;
  398.     size_t              prefix;
  399.     size_t              suffix;
  400.     eth_fcs_ref         fcs;
  401.     uint8_t *           data;
  402.  
  403.     length = packet_get_data_length( packet );
  404.     if( IS_DUMMY( flags )){
  405.         packet_trim( packet, sizeof( eth_preamble_t ), 0 );
  406.     }
  407.     if( length < sizeof( eth_header_t ) + ETH_MIN_CONTENT + ( IS_DUMMY( flags ) ? ETH_SUFFIX : 0 )) return NULL;
  408.     data = packet_get_data( packet );
  409.     header = ( eth_header_ex_ref ) data;
  410.     type = ntohs( header->header.ethertype );
  411.     if( type >= ETH_MIN_PROTO ){
  412.         // DIX Ethernet
  413.         prefix = sizeof( eth_header_t );
  414.         suffix = 0;
  415.         fcs = ( eth_fcs_ref ) data + length - sizeof( eth_fcs_t );
  416.         length -= sizeof( eth_fcs_t );
  417.     }else if( type <= ETH_MAX_CONTENT ){
  418.         // translate "LSAP" values
  419.         if(( header->lsap.dsap == ETH_LSAP_GLSAP ) && ( header->lsap.ssap == ETH_LSAP_GLSAP )){
  420.             // raw packet
  421.             // discard
  422.             return NULL;
  423.         }else if(( header->lsap.dsap == ETH_LSAP_SNAP ) && ( header->lsap.ssap == ETH_LSAP_SNAP )){
  424.             // IEEE 802.3 + 802.2 + LSAP + SNAP
  425.             // organization code not supported
  426.             type = ntohs( header->snap.ethertype );
  427.             prefix = sizeof( eth_header_t ) + sizeof( eth_header_lsap_t ) + sizeof( eth_header_snap_t );
  428.         }else{
  429.             // IEEE 802.3 + 802.2 LSAP
  430.             type = lsap_map( header->lsap.dsap );
  431.             prefix = sizeof( eth_header_t ) + sizeof( eth_header_lsap_t);
  432.         }
  433.         suffix = ( type < ETH_MIN_CONTENT ) ? ETH_MIN_CONTENT - type : 0u;
  434.         fcs = ( eth_fcs_ref ) data + prefix + type + suffix;
  435.         suffix += length - prefix - type;
  436.         length = prefix + type + suffix;
  437.     }else{
  438.         // invalid length/type, should not occurr
  439.         return NULL;
  440.     }
  441.     if( IS_DUMMY( flags )){
  442.         if(( ~ compute_crc32( ~ 0u, data, length * 8 )) != ntohl( * fcs )){
  443.             return NULL;
  444.         }
  445.         suffix += sizeof( eth_fcs_t );
  446.     }
  447.     if( ERROR_OCCURRED( packet_set_addr( packet, header->header.src, header->header.dest, ETH_ADDR ))
  448.     || ERROR_OCCURRED( packet_trim( packet, prefix, suffix ))){
  449.         return NULL;
  450.     }
  451.     return eth_protos_find( & eth_globals.protos, type );
  452. }
  453.  
  454. int nil_received_msg( int nil_phone, device_id_t device_id, packet_t packet, services_t target ){
  455.     eth_proto_ref   proto;
  456.     packet_t        next;
  457.     eth_device_ref  device;
  458.     int             flags;
  459.  
  460.     fibril_rwlock_read_lock( & eth_globals.devices_lock );
  461.     device = eth_devices_find( & eth_globals.devices, device_id );
  462.     if( ! device ){
  463.         fibril_rwlock_read_unlock( & eth_globals.devices_lock );
  464.         return ENOENT;
  465.     }
  466.     flags = device->flags;
  467.     fibril_rwlock_read_unlock( & eth_globals.devices_lock );
  468.     fibril_rwlock_read_lock( & eth_globals.protos_lock );
  469.     do{
  470.         next = pq_detach( packet );
  471.         proto = eth_process_packet( flags, packet );
  472.         if( proto ){
  473.             il_received_msg( proto->phone, device_id, packet, proto->service );
  474.         }else{
  475.             // drop invalid/unknown
  476.             pq_release( eth_globals.net_phone, packet_get_id( packet ));
  477.         }
  478.         packet = next;
  479.     }while( packet );
  480.     fibril_rwlock_read_unlock( & eth_globals.protos_lock );
  481.     return EOK;
  482. }
  483.  
  484. int eth_packet_space_message( device_id_t device_id, size_t * addr_len, size_t * prefix, size_t * content, size_t * suffix ){
  485.     eth_device_ref  device;
  486.  
  487.     if( !( addr_len && prefix && content && suffix )) return EBADMEM;
  488.     fibril_rwlock_read_lock( & eth_globals.devices_lock );
  489.     device = eth_devices_find( & eth_globals.devices, device_id );
  490.     if( ! device ){
  491.         fibril_rwlock_read_unlock( & eth_globals.devices_lock );
  492.         return ENOENT;
  493.     }
  494.     * content = device->mtu;
  495.     fibril_rwlock_read_unlock( & eth_globals.devices_lock );
  496.     * addr_len = ETH_ADDR;
  497.     * prefix = ETH_PREFIX;
  498.     * suffix = ETH_MIN_CONTENT + ETH_SUFFIX;
  499.     return EOK;
  500. }
  501.  
  502. int eth_addr_message( device_id_t device_id, eth_addr_type_t type, measured_string_ref * address ){
  503.     eth_device_ref  device;
  504.  
  505.     if( ! address ) return EBADMEM;
  506.     if( type == ETH_BROADCAST_ADDR ){
  507.         * address = eth_globals.broadcast_addr;
  508.     }else{
  509.         fibril_rwlock_read_lock( & eth_globals.devices_lock );
  510.         device = eth_devices_find( & eth_globals.devices, device_id );
  511.         if( ! device ){
  512.             fibril_rwlock_read_unlock( & eth_globals.devices_lock );
  513.             return ENOENT;
  514.         }
  515.         * address = device->addr;
  516.         fibril_rwlock_read_unlock( & eth_globals.devices_lock );
  517.     }
  518.     return ( * address ) ? EOK : ENOENT;
  519. }
  520.  
  521. int eth_register_message( services_t service, int phone ){
  522.     eth_proto_ref   proto;
  523.     int             protocol;
  524.     int             index;
  525.  
  526.     protocol = protocol_map( SERVICE_ETHERNET, service );
  527.     if( ! protocol ) return ENOENT;
  528.     fibril_rwlock_write_lock( & eth_globals.protos_lock );
  529.     proto = eth_protos_find( & eth_globals.protos, protocol );
  530.     if( proto ){
  531.         proto->phone = phone;
  532.         fibril_rwlock_write_unlock( & eth_globals.protos_lock );
  533.         return EOK;
  534.     }else{
  535.         proto = ( eth_proto_ref ) malloc( sizeof( eth_proto_t ));
  536.         if( ! proto ){
  537.             fibril_rwlock_write_unlock( & eth_globals.protos_lock );
  538.             return ENOMEM;
  539.         }
  540.         proto->service = service;
  541.         proto->protocol = protocol;
  542.         proto->phone = phone;
  543.         index = eth_protos_add( & eth_globals.protos, protocol, proto );
  544.         if( index < 0 ){
  545.             fibril_rwlock_write_unlock( & eth_globals.protos_lock );
  546.             free( proto );
  547.             return index;
  548.         }
  549.     }
  550.     printf( "New protocol registered:\n\tprotocol\t= 0x%x\n\tservice\t= %d\n\tphone\t= %d\n", proto->protocol, proto->service, proto->phone );
  551.     fibril_rwlock_write_unlock( & eth_globals.protos_lock );
  552.     return EOK;
  553. }
  554.  
  555. int eth_prepare_packet( int flags, packet_t packet, uint8_t * src_addr, int ethertype, size_t mtu ){
  556.     eth_header_ex_ref   header;
  557.     eth_header_ref      header_dix;
  558.     eth_fcs_ref         fcs;
  559.     uint8_t *           src;
  560.     uint8_t *           dest;
  561.     size_t              length;
  562.     int                 i;
  563.     void *              padding;
  564.     eth_preamble_ref    preamble;
  565.  
  566.     i = packet_get_addr( packet, & src, & dest );
  567.     if( i < 0 ) return i;
  568.     if( i != ETH_ADDR ) return EINVAL;
  569.     length = packet_get_data_length( packet );
  570.     if( length > mtu ) return EINVAL;
  571.     if( length < ETH_MIN_TAGGED_CONTENT( flags )){
  572.         padding = packet_suffix( packet, ETH_MIN_TAGGED_CONTENT( flags ) - length );
  573.         if( ! padding ) return ENOMEM;
  574.         bzero( padding, ETH_MIN_TAGGED_CONTENT( flags ) - length );
  575.     }
  576.     if( IS_DUMMY( flags )){
  577.         preamble = PACKET_PREFIX( packet, eth_preamble_t );
  578.         if( ! preamble ) return ENOMEM;
  579.         for( i = 0; i < 7; ++ i ) preamble->preamble[ i ] = ETH_PREAMBLE;
  580.         preamble->sfd = ETH_SFD;
  581.     }
  582.     // TODO LSAP only device
  583.     if( IS_DIX( flags ) || IS_8023_2_LSAP( flags )){
  584.         header_dix = PACKET_PREFIX( packet, eth_header_t );
  585.         if( ! header_dix ) return ENOMEM;
  586.         header_dix->ethertype = ( uint16_t ) ethertype;
  587.         memcpy( header_dix->src, src_addr, ETH_ADDR );
  588.         memcpy( header_dix->dest, dest, ETH_ADDR );
  589.         src = & header_dix->dest[ 0 ];
  590.     }else if( IS_8023_2_SNAP( flags )){
  591.         header = PACKET_PREFIX( packet, eth_header_ex_t );
  592.         if( ! header ) return ENOMEM;
  593.         header->header.ethertype = htons( length + sizeof( eth_header_lsap_t ) + sizeof( eth_header_snap_t ));
  594.         header->lsap.dsap = ( uint16_t ) ETH_LSAP_SNAP;
  595.         header->lsap.ssap = header->lsap.dsap;
  596.         header->lsap.ctrl = 0;
  597.         for( i = 0; i < 3; ++ i ) header->snap.proto[ i ] = 0;
  598.         header->snap.ethertype = ( uint16_t ) ethertype;
  599.         memcpy( header->header.src, src_addr, ETH_ADDR );
  600.         memcpy( header->header.dest, dest, ETH_ADDR );
  601.         src = & header->header.dest[ 0 ];
  602.     }
  603.     if( IS_DUMMY( flags )){
  604.         fcs = PACKET_SUFFIX( packet, eth_fcs_t );
  605.         if( ! fcs ) return ENOMEM;
  606.         * fcs = htonl( ~ compute_crc32( ~ 0u, src, length * 8 ));
  607.     }
  608.     return EOK;
  609. }
  610.  
  611. int eth_send_message( device_id_t device_id, packet_t packet, services_t sender ){
  612.     ERROR_DECLARE;
  613.  
  614.     eth_device_ref      device;
  615.     packet_t            next;
  616.     packet_t            tmp;
  617.     int                 ethertype;
  618.  
  619.     ethertype = htons( protocol_map( SERVICE_ETHERNET, sender ));
  620.     if( ! ethertype ){
  621.         pq_release( eth_globals.net_phone, packet_get_id( packet ));
  622.         return EINVAL;
  623.     }
  624.     fibril_rwlock_read_lock( & eth_globals.devices_lock );
  625.     device = eth_devices_find( & eth_globals.devices, device_id );
  626.     if( ! device ){
  627.         fibril_rwlock_read_unlock( & eth_globals.devices_lock );
  628.         return ENOENT;
  629.     }
  630.     // process packet queue
  631.     next = packet;
  632.     do{
  633.         if( ERROR_OCCURRED( eth_prepare_packet( device->flags, next, ( uint8_t * ) device->addr->value, ethertype, device->mtu ))){
  634.             // release invalid packet
  635.             tmp = pq_detach( next );
  636.             if( next == packet ) packet = tmp;
  637.             pq_release( eth_globals.net_phone, packet_get_id( next ));
  638.             next = tmp;
  639.         }else{
  640.             next = pq_next( next );
  641.         }
  642.     }while( next );
  643.     // send packet queue
  644.     if( packet ){
  645.         netif_send_msg( device->phone, device_id, packet, SERVICE_ETHERNET );
  646.     }
  647.     fibril_rwlock_read_unlock( & eth_globals.devices_lock );
  648.     return EOK;
  649. }
  650.  
  651. int nil_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
  652.     ERROR_DECLARE;
  653.  
  654.     measured_string_ref address;
  655.     packet_t            packet;
  656.  
  657. //  printf( "message %d - %d\n", IPC_GET_METHOD( * call ), NET_NIL_FIRST );
  658.     * answer_count = 0;
  659.     switch( IPC_GET_METHOD( * call )){
  660.         case IPC_M_PHONE_HUNGUP:
  661.             return EOK;
  662.         case NET_NIL_DEVICE:
  663.             return eth_device_message( IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), IPC_GET_MTU( call ));
  664.         case NET_NIL_SEND:
  665.             ERROR_PROPAGATE( packet_translate( eth_globals.net_phone, & packet, IPC_GET_PACKET( call )));
  666.             return eth_send_message( IPC_GET_DEVICE( call ), packet, IPC_GET_SERVICE( call ));
  667.         case NET_NIL_PACKET_SPACE:
  668.             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 )));
  669.             * answer_count = 4;
  670.             return EOK;
  671.         case NET_NIL_ADDR:
  672.             ERROR_PROPAGATE( eth_addr_message( IPC_GET_DEVICE( call ), ETH_LOCAL_ADDR, & address ));
  673.             return measured_strings_reply( address, 1 );
  674.         case NET_NIL_BROADCAST_ADDR:
  675.             ERROR_PROPAGATE( eth_addr_message( IPC_GET_DEVICE( call ), ETH_BROADCAST_ADDR, & address ));
  676.             return measured_strings_reply( address, 1 );
  677.         case IPC_M_CONNECT_TO_ME:
  678.             return eth_register_message( NIL_GET_PROTO( call ), IPC_GET_PHONE( call ));
  679.     }
  680.     return ENOTSUP;
  681. }
  682.  
  683. void eth_receiver( ipc_callid_t iid, ipc_call_t * icall ){
  684.     ERROR_DECLARE;
  685.  
  686.     packet_t        packet;
  687.  
  688.     while( true ){
  689. //      printf( "message %d - %d\n", IPC_GET_METHOD( * icall ), NET_NIL_FIRST );
  690.         switch( IPC_GET_METHOD( * icall )){
  691.             case NET_NIL_DEVICE_STATE:
  692.                 nil_device_state_msg( 0, IPC_GET_DEVICE( icall ), IPC_GET_STATE( icall ));
  693.                 ipc_answer_0( iid, EOK );
  694.                 break;
  695.             case NET_NIL_RECEIVED:
  696.                 if( ! ERROR_OCCURRED( packet_translate( eth_globals.net_phone, & packet, IPC_GET_PACKET( icall )))){
  697.                     ERROR_CODE = nil_received_msg( 0, IPC_GET_DEVICE( icall ), packet, 0 );
  698.                 }
  699.                 ipc_answer_0( iid, ( ipcarg_t ) ERROR_CODE );
  700.                 break;
  701.             default:
  702.                 ipc_answer_0( iid, ( ipcarg_t ) ENOTSUP );
  703.         }
  704.         iid = async_get_call( icall );
  705.     }
  706. }
  707.  
  708. /** @}
  709.  */
  710.