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