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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. /** @name Message processing functions
  175.  */
  176. /*@{*/
  177.  
  178. /** Processes IPC messages from the registered device driver modules in an infinite loop.
  179.  *  @param iid The message identifier. Input parameter.
  180.  *  @param icall The message parameters. Input/output parameter.
  181.  */
  182. void    eth_receiver( ipc_callid_t iid, ipc_call_t * icall );
  183.  
  184. /** Registers new device or updates the MTU of an existing one.
  185.  *  Determines the device local hardware address.
  186.  *  @param device_id The new device identifier. Input parameter.
  187.  *  @param service The device driver service. Input parameter.
  188.  *  @param mtu The device maximum transmission unit. Input parameter.
  189.  *  @returns EOK on success.
  190.  *  @returns EEXIST if the device with the different service exists.
  191.  *  @returns ENOMEM if there is not enough memory left.
  192.  *  @returns Other error codes as defined for the net_get_device_conf_req() function.
  193.  *  @returns Other error codes as defined for the netif_bind_service() function.
  194.  *  @returns Other error codes as defined for the netif_get_addr() function.
  195.  */
  196. int eth_device_message( device_id_t device_id, services_t service, size_t mtu );
  197.  
  198. /** Registers receiving module service.
  199.  *  Passes received packets for this service.
  200.  *  @param service The module service. Input parameter.
  201.  *  @param phone The service phone. Input parameter.
  202.  *  @returns EOK on success.
  203.  *  @returns ENOENT if the service is not known.
  204.  *  @returns ENOMEM if there is not enough memory left.
  205.  */
  206. int eth_register_message( services_t service, int phone );
  207.  
  208. /** Returns the device packet dimensions for sending.
  209.  *  @param device_id The device identifier. Input parameter.
  210.  *  @param addr_len The minimum reserved address length. Output parameter.
  211.  *  @param prefix The minimum reserved prefix size. Output parameter.
  212.  *  @param content The maximum content size. Output parameter.
  213.  *  @param suffix The minimum reserved suffix size. Output parameter.
  214.  *  @returns EOK on success.
  215.  *  @returns EBADMEM if either one of the parameters is NULL.
  216.  *  @returns ENOENT if there is no such device.
  217.  */
  218. int eth_packet_space_message( device_id_t device_id, size_t * addr_len, size_t * prefix, size_t * content, size_t * suffix );
  219.  
  220. /** Returns the device hardware address.
  221.  *  @param device_id The device identifier. Input parameter.
  222.  *  @param type Type of the desired address. Input parameter
  223.  *  @param address The device hardware address. Output parameter.
  224.  *  @returns EOK on success.
  225.  *  @returns EBADMEM if the address parameter is NULL.
  226.  *  @returns ENOENT if there no such device.
  227.  */
  228. int eth_addr_message( device_id_t device_id, eth_addr_type_t type, measured_string_ref * address );
  229.  
  230. /** Sends the packet queue.
  231.  *  Sends only packet successfully processed by the eth_prepare_packet() function.
  232.  *  @param device_id The device identifier. Input parameter.
  233.  *  @param packet The packet queue. Input parameter.
  234.  *  @param sender The sending module service. Input parameter.
  235.  *  @returns EOK on success.
  236.  *  @returns ENOENT if there no such device.
  237.  *  @returns EINVAL if the service parameter is not known.
  238.  */
  239. int eth_send_message( device_id_t device_id, packet_t packet, services_t sender );
  240.  
  241. /*@}*/
  242.  
  243. /** Processes the received packet and chooses the target registered module.
  244.  *  @param flags The device flags. Input parameter.
  245.  *  @param packet The packet. Input parameter.
  246.  *  @returns The target registered module.
  247.  *  @returns NULL if the packet is not long enough.
  248.  *  @returns NULL if the packet is too long.
  249.  *  @returns NULL if the raw ethernet protocol is used.
  250.  *  @returns NULL if the dummy device FCS checksum is invalid.
  251.  *  @returns NULL if the packet address length is not big enough.
  252.  */
  253. eth_proto_ref   eth_process_packet( int flags, packet_t packet );
  254.  
  255. /** Prepares the packet for sending.
  256.  *  @param flags The device flags. Input parameter.
  257.  *  @param packet The packet. Input parameter.
  258.  *  @param src_addr The source hardware address. Input parameter.
  259.  *  @param ethertype The ethernet protocol type. Input parameter.
  260.  *  @param mtu The device maximum transmission unit. Input parameter.
  261.  *  @returns EOK on success.
  262.  *  @returns EINVAL if the packet addresses length is not long enough.
  263.  *  @returns EINVAL if the packet is bigger than the device MTU.
  264.  *  @returns ENOMEM if there is not enough memory in the packet.
  265.  */
  266. int eth_prepare_packet( int flags, packet_t packet, uint8_t * src_addr, int ethertype, size_t mtu );
  267.  
  268. DEVICE_MAP_IMPLEMENT( eth_devices, eth_device_t )
  269.  
  270. INT_MAP_IMPLEMENT( eth_protos, eth_proto_t )
  271.  
  272. int nil_device_state_msg( int nil_phone, device_id_t device_id, int state ){
  273.     int             index;
  274.     eth_proto_ref   proto;
  275.  
  276.     //TODO clear device if off?
  277.     fibril_rwlock_read_lock( & eth_globals.protos_lock );
  278.     for( index = eth_protos_count( & eth_globals.protos ) - 1; index >= 0; -- index ){
  279.         proto = eth_protos_get_index( & eth_globals.protos, index );
  280.         if( proto && proto->phone ) il_device_state_msg( proto->phone, device_id, state, proto->service );
  281.     }
  282.     fibril_rwlock_read_unlock( & eth_globals.protos_lock );
  283.     return EOK;
  284. }
  285.  
  286. int nil_initialize( int net_phone ){
  287.     ERROR_DECLARE;
  288.  
  289.     fibril_rwlock_initialize( & eth_globals.devices_lock );
  290.     fibril_rwlock_initialize( & eth_globals.protos_lock );
  291.     fibril_rwlock_write_lock( & eth_globals.devices_lock );
  292.     fibril_rwlock_write_lock( & eth_globals.protos_lock );
  293.     eth_globals.net_phone = net_phone;
  294.     eth_globals.broadcast_addr = measured_string_create_bulk( "\xFF\xFF\xFF\xFF\xFF\xFF", CONVERT_SIZE( uint8_t, char, ETH_ADDR ));
  295.     if( ! eth_globals.broadcast_addr ) return ENOMEM;
  296.     ERROR_PROPAGATE( eth_devices_initialize( & eth_globals.devices ));
  297.     if( ERROR_OCCURRED( eth_protos_initialize( & eth_globals.protos ))){
  298.         eth_devices_destroy( & eth_globals.devices );
  299.         return ERROR_CODE;
  300.     }
  301.     fibril_rwlock_write_unlock( & eth_globals.protos_lock );
  302.     fibril_rwlock_write_unlock( & eth_globals.devices_lock );
  303.     return EOK;
  304. }
  305.  
  306. int eth_device_message( device_id_t device_id, services_t service, size_t mtu ){
  307.     ERROR_DECLARE;
  308.  
  309.     eth_device_ref  device;
  310.     int             index;
  311.     measured_string_t   names[ 2 ] = {{ "ETH_MODE", 8 }, { "ETH_DUMMY", 9 }};
  312.     measured_string_ref configuration;
  313.     size_t              count = sizeof( names ) / sizeof( measured_string_t );
  314.     char *              data;
  315.     eth_proto_ref       proto;
  316.  
  317.     fibril_rwlock_write_lock( & eth_globals.devices_lock );
  318.     // an existing device?
  319.     device = eth_devices_find( & eth_globals.devices, device_id );
  320.     if( device ){
  321.         if( device->service != service ){
  322.             printf( "Device %d already exists\n", device->device_id );
  323.             fibril_rwlock_write_unlock( & eth_globals.devices_lock );
  324.             return EEXIST;
  325.         }else{
  326.             // update mtu
  327.             device->mtu = mtu;
  328.             printf( "Device %d already exists:\tMTU\t= %d\n", device->device_id, device->mtu );
  329.             fibril_rwlock_write_unlock( & eth_globals.devices_lock );
  330.             // notify all upper layer modules
  331.             fibril_rwlock_read_lock( & eth_globals.protos_lock );
  332.             for( index = 0; index < eth_protos_count( & eth_globals.protos ); ++ index ){
  333.                 proto = eth_protos_get_index( & eth_globals.protos, index );
  334.                 if ( proto->phone ){
  335.                     il_mtu_changed_msg( proto->phone, device->device_id, device->mtu, proto->service );
  336.                 }
  337.             }
  338.             fibril_rwlock_read_unlock( & eth_globals.protos_lock );
  339.             return EOK;
  340.         }
  341.     }else{
  342.         // create a new device
  343.         device = ( eth_device_ref ) malloc( sizeof( eth_device_t ));
  344.         if( ! device ) return ENOMEM;
  345.         device->device_id = device_id;
  346.         device->service = service;
  347.         device->flags = 0;
  348.         device->mtu = (( mtu > 0 ) && ( mtu <= ETH_MAX_TAGGED_CONTENT( device->flags ))) ? mtu : ETH_MAX_TAGGED_CONTENT( device->flags );
  349.         configuration = & names[ 0 ];
  350.         if( ERROR_OCCURRED( net_get_device_conf_req( eth_globals.net_phone, device->device_id, & configuration, count, & data ))){
  351.             fibril_rwlock_write_unlock( & eth_globals.devices_lock );
  352.             free( device );
  353.             return ERROR_CODE;
  354.         }
  355.         if( configuration ){
  356.             if( ! str_lcmp( configuration[ 0 ].value, "DIX", configuration[ 0 ].length )){
  357.                 device->flags |= ETH_DIX;
  358.             }else if( ! str_lcmp( configuration[ 0 ].value, "8023_2_LSAP", configuration[ 0 ].length )){
  359.                 // TODO 8023_2_LSAP
  360.                 printf( "8023_2_LSAP is not supported (yet?), DIX used instead\n" );
  361.                 device->flags |= ETH_DIX;
  362.             }else device->flags |= ETH_8023_2_SNAP;
  363.             if(( configuration[ 1 ].value ) && ( configuration[ 1 ].value[ 0 ] == 'y' )){
  364.                 device->flags |= ETH_DUMMY;
  365.             }
  366.             net_free_settings( configuration, data );
  367.         }else{
  368.             device->flags |= ETH_8023_2_SNAP;
  369.         }
  370.         // bind the device driver
  371.         device->phone = netif_bind_service( device->service, device->device_id, SERVICE_ETHERNET, eth_receiver );
  372.         if( device->phone < 0 ){
  373.             fibril_rwlock_write_unlock( & eth_globals.devices_lock );
  374.             free( device );
  375.             return device->phone;
  376.         }
  377.         // get hardware address
  378.         if( ERROR_OCCURRED( netif_get_addr( device->phone, device->device_id, & device->addr, & device->addr_data ))){
  379.             fibril_rwlock_write_unlock( & eth_globals.devices_lock );
  380.             free( device );
  381.             return ERROR_CODE;
  382.         }
  383.         // add to the cache
  384.         index = eth_devices_add( & eth_globals.devices, device->device_id, device );
  385.         if( index < 0 ){
  386.             fibril_rwlock_write_unlock( & eth_globals.devices_lock );
  387.             free( device->addr );
  388.             free( device->addr_data );
  389.             free( device );
  390.             return index;
  391.         }
  392.         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 );
  393.     }
  394.     fibril_rwlock_write_unlock( & eth_globals.devices_lock );
  395.     return EOK;
  396. }
  397.  
  398. eth_proto_ref eth_process_packet( int flags, packet_t packet ){
  399.     ERROR_DECLARE;
  400.  
  401.     eth_header_ex_ref   header;
  402.     size_t              length;
  403.     eth_type_t          type;
  404.     size_t              prefix;
  405.     size_t              suffix;
  406.     eth_fcs_ref         fcs;
  407.     uint8_t *           data;
  408.  
  409.     length = packet_get_data_length( packet );
  410.     if( IS_DUMMY( flags )){
  411.         packet_trim( packet, sizeof( eth_preamble_t ), 0 );
  412.     }
  413.     if( length < sizeof( eth_header_t ) + ETH_MIN_CONTENT + ( IS_DUMMY( flags ) ? ETH_SUFFIX : 0 )) return NULL;
  414.     data = packet_get_data( packet );
  415.     header = ( eth_header_ex_ref ) data;
  416.     type = ntohs( header->header.ethertype );
  417.     if( type >= ETH_MIN_PROTO ){
  418.         // DIX Ethernet
  419.         prefix = sizeof( eth_header_t );
  420.         suffix = 0;
  421.         fcs = ( eth_fcs_ref ) data + length - sizeof( eth_fcs_t );
  422.         length -= sizeof( eth_fcs_t );
  423.     }else if( type <= ETH_MAX_CONTENT ){
  424.         // translate "LSAP" values
  425.         if(( header->lsap.dsap == ETH_LSAP_GLSAP ) && ( header->lsap.ssap == ETH_LSAP_GLSAP )){
  426.             // raw packet
  427.             // discard
  428.             return NULL;
  429.         }else if(( header->lsap.dsap == ETH_LSAP_SNAP ) && ( header->lsap.ssap == ETH_LSAP_SNAP )){
  430.             // IEEE 802.3 + 802.2 + LSAP + SNAP
  431.             // organization code not supported
  432.             type = ntohs( header->snap.ethertype );
  433.             prefix = sizeof( eth_header_t ) + sizeof( eth_header_lsap_t ) + sizeof( eth_header_snap_t );
  434.         }else{
  435.             // IEEE 802.3 + 802.2 LSAP
  436.             type = lsap_map( header->lsap.dsap );
  437.             prefix = sizeof( eth_header_t ) + sizeof( eth_header_lsap_t);
  438.         }
  439.         suffix = ( type < ETH_MIN_CONTENT ) ? ETH_MIN_CONTENT - type : 0u;
  440.         fcs = ( eth_fcs_ref ) data + prefix + type + suffix;
  441.         suffix += length - prefix - type;
  442.         length = prefix + type + suffix;
  443.     }else{
  444.         // invalid length/type, should not occurr
  445.         return NULL;
  446.     }
  447.     if( IS_DUMMY( flags )){
  448.         if(( ~ compute_crc32( ~ 0u, data, length * 8 )) != ntohl( * fcs )){
  449.             return NULL;
  450.         }
  451.         suffix += sizeof( eth_fcs_t );
  452.     }
  453.     if( ERROR_OCCURRED( packet_set_addr( packet, header->header.src, header->header.dest, ETH_ADDR ))
  454.     || ERROR_OCCURRED( packet_trim( packet, prefix, suffix ))){
  455.         return NULL;
  456.     }
  457.     return eth_protos_find( & eth_globals.protos, type );
  458. }
  459.  
  460. int nil_received_msg( int nil_phone, device_id_t device_id, packet_t packet, services_t target ){
  461.     eth_proto_ref   proto;
  462.     packet_t        next;
  463.     eth_device_ref  device;
  464.     int             flags;
  465.  
  466.     fibril_rwlock_read_lock( & eth_globals.devices_lock );
  467.     device = eth_devices_find( & eth_globals.devices, device_id );
  468.     if( ! device ){
  469.         fibril_rwlock_read_unlock( & eth_globals.devices_lock );
  470.         return ENOENT;
  471.     }
  472.     flags = device->flags;
  473.     fibril_rwlock_read_unlock( & eth_globals.devices_lock );
  474.     fibril_rwlock_read_lock( & eth_globals.protos_lock );
  475.     do{
  476.         next = pq_detach( packet );
  477.         proto = eth_process_packet( flags, packet );
  478.         if( proto ){
  479.             il_received_msg( proto->phone, device_id, packet, proto->service );
  480.         }else{
  481.             // drop invalid/unknown
  482.             pq_release( eth_globals.net_phone, packet_get_id( packet ));
  483.         }
  484.         packet = next;
  485.     }while( packet );
  486.     fibril_rwlock_read_unlock( & eth_globals.protos_lock );
  487.     return EOK;
  488. }
  489.  
  490. int eth_packet_space_message( device_id_t device_id, size_t * addr_len, size_t * prefix, size_t * content, size_t * suffix ){
  491.     eth_device_ref  device;
  492.  
  493.     if( !( addr_len && prefix && content && suffix )) return EBADMEM;
  494.     fibril_rwlock_read_lock( & eth_globals.devices_lock );
  495.     device = eth_devices_find( & eth_globals.devices, device_id );
  496.     if( ! device ){
  497.         fibril_rwlock_read_unlock( & eth_globals.devices_lock );
  498.         return ENOENT;
  499.     }
  500.     * content = device->mtu;
  501.     fibril_rwlock_read_unlock( & eth_globals.devices_lock );
  502.     * addr_len = ETH_ADDR;
  503.     * prefix = ETH_PREFIX;
  504.     * suffix = ETH_MIN_CONTENT + ETH_SUFFIX;
  505.     return EOK;
  506. }
  507.  
  508. int eth_addr_message( device_id_t device_id, eth_addr_type_t type, measured_string_ref * address ){
  509.     eth_device_ref  device;
  510.  
  511.     if( ! address ) return EBADMEM;
  512.     if( type == ETH_BROADCAST_ADDR ){
  513.         * address = eth_globals.broadcast_addr;
  514.     }else{
  515.         fibril_rwlock_read_lock( & eth_globals.devices_lock );
  516.         device = eth_devices_find( & eth_globals.devices, device_id );
  517.         if( ! device ){
  518.             fibril_rwlock_read_unlock( & eth_globals.devices_lock );
  519.             return ENOENT;
  520.         }
  521.         * address = device->addr;
  522.         fibril_rwlock_read_unlock( & eth_globals.devices_lock );
  523.     }
  524.     return ( * address ) ? EOK : ENOENT;
  525. }
  526.  
  527. int eth_register_message( services_t service, int phone ){
  528.     eth_proto_ref   proto;
  529.     int             protocol;
  530.     int             index;
  531.  
  532.     protocol = protocol_map( SERVICE_ETHERNET, service );
  533.     if( ! protocol ) return ENOENT;
  534.     fibril_rwlock_write_lock( & eth_globals.protos_lock );
  535.     proto = eth_protos_find( & eth_globals.protos, protocol );
  536.     if( proto ){
  537.         proto->phone = phone;
  538.         fibril_rwlock_write_unlock( & eth_globals.protos_lock );
  539.         return EOK;
  540.     }else{
  541.         proto = ( eth_proto_ref ) malloc( sizeof( eth_proto_t ));
  542.         if( ! proto ){
  543.             fibril_rwlock_write_unlock( & eth_globals.protos_lock );
  544.             return ENOMEM;
  545.         }
  546.         proto->service = service;
  547.         proto->protocol = protocol;
  548.         proto->phone = phone;
  549.         index = eth_protos_add( & eth_globals.protos, protocol, proto );
  550.         if( index < 0 ){
  551.             fibril_rwlock_write_unlock( & eth_globals.protos_lock );
  552.             free( proto );
  553.             return index;
  554.         }
  555.     }
  556.     printf( "New protocol registered:\n\tprotocol\t= 0x%x\n\tservice\t= %d\n\tphone\t= %d\n", proto->protocol, proto->service, proto->phone );
  557.     fibril_rwlock_write_unlock( & eth_globals.protos_lock );
  558.     return EOK;
  559. }
  560.  
  561. int eth_prepare_packet( int flags, packet_t packet, uint8_t * src_addr, int ethertype, size_t mtu ){
  562.     eth_header_ex_ref   header;
  563.     eth_header_ref      header_dix;
  564.     eth_fcs_ref         fcs;
  565.     uint8_t *           src;
  566.     uint8_t *           dest;
  567.     size_t              length;
  568.     int                 i;
  569.     void *              padding;
  570.     eth_preamble_ref    preamble;
  571.  
  572.     i = packet_get_addr( packet, & src, & dest );
  573.     if( i < 0 ) return i;
  574.     if( i != ETH_ADDR ) return EINVAL;
  575.     length = packet_get_data_length( packet );
  576.     if( length > mtu ) return EINVAL;
  577.     if( length < ETH_MIN_TAGGED_CONTENT( flags )){
  578.         padding = packet_suffix( packet, ETH_MIN_TAGGED_CONTENT( flags ) - length );
  579.         if( ! padding ) return ENOMEM;
  580.         bzero( padding, ETH_MIN_TAGGED_CONTENT( flags ) - length );
  581.     }
  582.     if( IS_DUMMY( flags )){
  583.         preamble = PACKET_PREFIX( packet, eth_preamble_t );
  584.         if( ! preamble ) return ENOMEM;
  585.         for( i = 0; i < 7; ++ i ) preamble->preamble[ i ] = ETH_PREAMBLE;
  586.         preamble->sfd = ETH_SFD;
  587.     }
  588.     // TODO LSAP only device
  589.     if( IS_DIX( flags ) || IS_8023_2_LSAP( flags )){
  590.         header_dix = PACKET_PREFIX( packet, eth_header_t );
  591.         if( ! header_dix ) return ENOMEM;
  592.         header_dix->ethertype = ( uint16_t ) ethertype;
  593.         memcpy( header_dix->src, src_addr, ETH_ADDR );
  594.         memcpy( header_dix->dest, dest, ETH_ADDR );
  595.         src = & header_dix->dest[ 0 ];
  596.     }else if( IS_8023_2_SNAP( flags )){
  597.         header = PACKET_PREFIX( packet, eth_header_ex_t );
  598.         if( ! header ) return ENOMEM;
  599.         header->header.ethertype = htons( length + sizeof( eth_header_lsap_t ) + sizeof( eth_header_snap_t ));
  600.         header->lsap.dsap = ( uint16_t ) ETH_LSAP_SNAP;
  601.         header->lsap.ssap = header->lsap.dsap;
  602.         header->lsap.ctrl = 0;
  603.         for( i = 0; i < 3; ++ i ) header->snap.proto[ i ] = 0;
  604.         header->snap.ethertype = ( uint16_t ) ethertype;
  605.         memcpy( header->header.src, src_addr, ETH_ADDR );
  606.         memcpy( header->header.dest, dest, ETH_ADDR );
  607.         src = & header->header.dest[ 0 ];
  608.     }
  609.     if( IS_DUMMY( flags )){
  610.         fcs = PACKET_SUFFIX( packet, eth_fcs_t );
  611.         if( ! fcs ) return ENOMEM;
  612.         * fcs = htonl( ~ compute_crc32( ~ 0u, src, length * 8 ));
  613.     }
  614.     return EOK;
  615. }
  616.  
  617. int eth_send_message( device_id_t device_id, packet_t packet, services_t sender ){
  618.     ERROR_DECLARE;
  619.  
  620.     eth_device_ref      device;
  621.     packet_t            next;
  622.     packet_t            tmp;
  623.     int                 ethertype;
  624.  
  625.     ethertype = htons( protocol_map( SERVICE_ETHERNET, sender ));
  626.     if( ! ethertype ){
  627.         pq_release( eth_globals.net_phone, packet_get_id( packet ));
  628.         return EINVAL;
  629.     }
  630.     fibril_rwlock_read_lock( & eth_globals.devices_lock );
  631.     device = eth_devices_find( & eth_globals.devices, device_id );
  632.     if( ! device ){
  633.         fibril_rwlock_read_unlock( & eth_globals.devices_lock );
  634.         return ENOENT;
  635.     }
  636.     // process packet queue
  637.     next = packet;
  638.     do{
  639.         if( ERROR_OCCURRED( eth_prepare_packet( device->flags, next, ( uint8_t * ) device->addr->value, ethertype, device->mtu ))){
  640.             // release invalid packet
  641.             tmp = pq_detach( next );
  642.             if( next == packet ) packet = tmp;
  643.             pq_release( eth_globals.net_phone, packet_get_id( next ));
  644.             next = tmp;
  645.         }else{
  646.             next = pq_next( next );
  647.         }
  648.     }while( next );
  649.     // send packet queue
  650.     if( packet ){
  651.         netif_send_msg( device->phone, device_id, packet, SERVICE_ETHERNET );
  652.     }
  653.     fibril_rwlock_read_unlock( & eth_globals.devices_lock );
  654.     return EOK;
  655. }
  656.  
  657. int nil_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
  658.     ERROR_DECLARE;
  659.  
  660.     measured_string_ref address;
  661.     packet_t            packet;
  662.  
  663. //  printf( "message %d - %d\n", IPC_GET_METHOD( * call ), NET_NIL_FIRST );
  664.     * answer_count = 0;
  665.     switch( IPC_GET_METHOD( * call )){
  666.         case IPC_M_PHONE_HUNGUP:
  667.             return EOK;
  668.         case NET_NIL_DEVICE:
  669.             return eth_device_message( IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), IPC_GET_MTU( call ));
  670.         case NET_NIL_SEND:
  671.             ERROR_PROPAGATE( packet_translate( eth_globals.net_phone, & packet, IPC_GET_PACKET( call )));
  672.             return eth_send_message( IPC_GET_DEVICE( call ), packet, IPC_GET_SERVICE( call ));
  673.         case NET_NIL_PACKET_SPACE:
  674.             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 )));
  675.             * answer_count = 4;
  676.             return EOK;
  677.         case NET_NIL_ADDR:
  678.             ERROR_PROPAGATE( eth_addr_message( IPC_GET_DEVICE( call ), ETH_LOCAL_ADDR, & address ));
  679.             return measured_strings_reply( address, 1 );
  680.         case NET_NIL_BROADCAST_ADDR:
  681.             ERROR_PROPAGATE( eth_addr_message( IPC_GET_DEVICE( call ), ETH_BROADCAST_ADDR, & address ));
  682.             return measured_strings_reply( address, 1 );
  683.         case IPC_M_CONNECT_TO_ME:
  684.             return eth_register_message( NIL_GET_PROTO( call ), IPC_GET_PHONE( call ));
  685.     }
  686.     return ENOTSUP;
  687. }
  688.  
  689. void eth_receiver( ipc_callid_t iid, ipc_call_t * icall ){
  690.     ERROR_DECLARE;
  691.  
  692.     packet_t        packet;
  693.  
  694.     while( true ){
  695. //      printf( "message %d - %d\n", IPC_GET_METHOD( * icall ), NET_NIL_FIRST );
  696.         switch( IPC_GET_METHOD( * icall )){
  697.             case NET_NIL_DEVICE_STATE:
  698.                 nil_device_state_msg( 0, IPC_GET_DEVICE( icall ), IPC_GET_STATE( icall ));
  699.                 ipc_answer_0( iid, EOK );
  700.                 break;
  701.             case NET_NIL_RECEIVED:
  702.                 if( ! ERROR_OCCURRED( packet_translate( eth_globals.net_phone, & packet, IPC_GET_PACKET( icall )))){
  703.                     ERROR_CODE = nil_received_msg( 0, IPC_GET_DEVICE( icall ), packet, 0 );
  704.                 }
  705.                 ipc_answer_0( iid, ( ipcarg_t ) ERROR_CODE );
  706.                 break;
  707.             default:
  708.                 ipc_answer_0( iid, ( ipcarg_t ) ENOTSUP );
  709.         }
  710.         iid = async_get_call( icall );
  711.     }
  712. }
  713.  
  714. /** @}
  715.  */
  716.