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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 lo
  30.  *  @{
  31.  */
  32.  
  33. /** @file
  34.  *  Loopback network interface implementation.
  35.  */
  36.  
  37. #include <async.h>
  38. #include <errno.h>
  39. #include <stdio.h>
  40.  
  41. #include <ipc/ipc.h>
  42. #include <ipc/services.h>
  43.  
  44. #include "../../err.h"
  45. #include "../../messages.h"
  46. #include "../../modules.h"
  47.  
  48. #include "../../structures/measured_strings.h"
  49. #include "../../structures/packet/packet_client.h"
  50.  
  51. #include "../../include/device.h"
  52. #include "../../include/nil_interface.h"
  53. #include "../../include/net_interface.h"
  54.  
  55. #include "../netif.h"
  56. #include "../netif_module.h"
  57.  
  58. /** Default maximum transmission unit.
  59.  */
  60. #define DEFAULT_MTU 1500
  61.  
  62. /** Default hardware address.
  63.  */
  64. #define DEFAULT_ADDR        "\0\0\0\0\0\0"
  65.  
  66. /** Default address length.
  67.  */
  68. #define DEFAULT_ADDR_LEN    ( sizeof( DEFAULT_ADDR ) / sizeof( char ))
  69.  
  70. /** Loopback module name.
  71.  */
  72. #define NAME    "lo - loopback interface"
  73.  
  74. /** Network interface global data.
  75.  */
  76. netif_globals_t netif_globals;
  77.  
  78. /** Loopback module global data.
  79.  */
  80. static struct lo_globals{
  81.     unsigned int mtu;
  82. } lo_globals;
  83.  
  84. /** Changes the loopback state.
  85.  *  @param device The device structure. Input parameter.
  86.  *  @param state The new device state. Input parameter.
  87.  *  @returns The new state if changed.
  88.  *  @returns EOK otherwise.
  89.  */
  90. int change_state_message( device_ref device, device_state_t state );
  91.  
  92. /** Creates and returns the loopback network interface structure.
  93.  *  @param device_id The new devce identifier. Input parameter.
  94.  *  @param device The device structure. Output parameter.
  95.  *  @returns EOK on success.
  96.  *  @returns EXDEV if one loopback network interface already exists.
  97.  *  @returns ENOMEM if there is not enough memory left.
  98.  */
  99. int create( device_id_t device_id, device_ref * device );
  100.  
  101. /** Prints the module name.
  102.  *  @see NAME
  103.  */
  104. void    module_print_name( void );
  105.  
  106. int netif_specific_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
  107.     return ENOTSUP;
  108. }
  109.  
  110. int netif_get_addr_message( device_id_t device_id, measured_string_ref address ){
  111.     if( ! address ) return EBADMEM;
  112.     address->value = DEFAULT_ADDR;
  113.     address->length = DEFAULT_ADDR_LEN;
  114.     return EOK;
  115. }
  116.  
  117. int netif_get_device_stats( device_id_t device_id, device_stats_ref stats ){
  118.     ERROR_DECLARE;
  119.  
  120.     device_ref  device;
  121.  
  122.     if( ! stats ) return EBADMEM;
  123.     ERROR_PROPAGATE( find_device( device_id, & device ));
  124.     memcpy( stats, ( device_stats_ref ) device->specific, sizeof( device_stats_t ));
  125.     return EOK;
  126. }
  127.  
  128. int change_state_message( device_ref device, device_state_t state ){
  129.     if( device->state != state ){
  130.         device->state = state;
  131.         printf( "State changed to %s\n", ( state == NETIF_ACTIVE ) ? "ACTIVE" : "STOPPED" );
  132.         return state;
  133.     }
  134.     return EOK;
  135. }
  136.  
  137. int create( device_id_t device_id, device_ref * device ){
  138.     int index;
  139.  
  140.     if( device_map_count( & netif_globals.device_map ) > 0 ){
  141.         return EXDEV;
  142.     }else{
  143.         * device = ( device_ref ) malloc( sizeof( device_t ));
  144.         if( !( * device )) return ENOMEM;
  145.         ( ** device ).specific = malloc( sizeof( device_stats_t ));
  146.         if( ! ( ** device ).specific ){
  147.             free( * device );
  148.             return ENOMEM;
  149.         }
  150.         null_device_stats(( device_stats_ref )( ** device ).specific );
  151.         ( ** device ).device_id = device_id;
  152.         ( ** device ).nil_phone = -1;
  153.         ( ** device ).state = NETIF_STOPPED;
  154.         index = device_map_add( & netif_globals.device_map, ( ** device ).device_id, * device );
  155.         if( index < 0 ){
  156.             free( * device );
  157.             free(( ** device ).specific );
  158.             * device = NULL;
  159.             return index;
  160.         }
  161.     }
  162.     return EOK;
  163. }
  164.  
  165. int netif_initialize( void ){
  166.     ipcarg_t    phonehash;
  167.  
  168.     return REGISTER_ME( SERVICE_LO, & phonehash );
  169. }
  170.  
  171. void module_print_name( void ){
  172.     printf( "%s", NAME );
  173. }
  174.  
  175. int netif_probe_auto_message( void ){
  176. /*  ERROR_DECLARE;
  177.  
  178.     device_ref  device;
  179.  
  180.     ERROR_PROPAGATE( create( arg1, & device ));
  181.     ipc_call_sync_3_3( netif_globals.net_phone, NET_NET_DEVICE, device->device_id, NULL, NULL, NULL, NULL, NULL );
  182. */  return ENOTSUP;
  183. }
  184.  
  185. int netif_probe_message( device_id_t device_id, int irq, int io ){
  186.     ERROR_DECLARE;
  187.  
  188.     device_ref          device;
  189.     measured_string_t   names[ 1 ] = {{ "MTU", 3 }};
  190.     measured_string_ref configuration;
  191.     int                 count = 1;
  192.     char *              data;
  193.  
  194.     configuration = & names[ 0 ];
  195.     // create a new device
  196.     ERROR_PROPAGATE( create( device_id, & device ));
  197.     // get configuration
  198.     ERROR_PROPAGATE( net_get_device_conf_req( netif_globals.net_phone, device->device_id, & configuration, count, & data ));
  199.     // MTU is the first one
  200.     if( configuration && configuration[ 0 ].value ){
  201.         lo_globals.mtu = strtoul( configuration[ 0 ].value, NULL, 0 );
  202.         net_free_settings( configuration, data );
  203.     }else{
  204.         lo_globals.mtu = DEFAULT_MTU;
  205.     }
  206.     // print the settings
  207.     printf("New device registered:\n\tid\t= %d\n\tMTU\t= %d\n", device->device_id, lo_globals.mtu );
  208.     return EOK;
  209. }
  210.  
  211. int netif_send_message( device_id_t device_id, packet_t packet, services_t sender ){
  212.     ERROR_DECLARE;
  213.  
  214.     device_ref  device;
  215.     size_t      length;
  216.     packet_t    next;
  217.     int         phone;
  218.  
  219.     ERROR_PROPAGATE( find_device( device_id, & device ));
  220.     if( device->state != NETIF_ACTIVE ) return EPERM;
  221.     next = packet;
  222.     do{
  223.         ++ (( device_stats_ref ) device->specific )->tx_packets;
  224.         ++ (( device_stats_ref ) device->specific )->rx_packets;
  225.         length = packet_get_data_length( next );
  226.         (( device_stats_ref ) device->specific )->tx_bytes += length;
  227.         (( device_stats_ref ) device->specific )->rx_bytes += length;
  228.         next = pq_next( next );
  229.     }while( next );
  230.     phone = device->nil_phone;
  231.     rwlock_write_unlock( & netif_globals.lock );
  232.     nil_received_msg( phone, device_id, packet, sender );
  233.     rwlock_write_lock( & netif_globals.lock );
  234.     return EOK;
  235. }
  236.  
  237. int netif_start_message( device_ref device ){
  238.     return change_state_message( device, NETIF_ACTIVE );
  239. }
  240.  
  241. int netif_stop_message( device_ref device ){
  242.     return change_state_message( device, NETIF_STOPPED );
  243. }
  244.  
  245. /** @}
  246.  */
  247.