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  1. /*
  2.  * Copyright (c) 2008 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 arp
  30.  *  @{
  31.  */
  32.  
  33. /** @file
  34.  */
  35.  
  36. #include <as.h>
  37. #include <async.h>
  38. #include <malloc.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 "../measured_strings.h"
  47. #include "../messages.h"
  48. #include "../modules.h"
  49. #include "../packet.h"
  50.  
  51. #include "../include/protocol_map.h"
  52. #include "../netif/device.h"
  53.  
  54. #include "arp.h"
  55. #include "arp_header.h"
  56. #include "arp_oc.h"
  57. //#include "arp_messages.h"
  58. #include "arp_module.h"
  59.  
  60. #define IPC_GET_DEVICE( call )      ( device_id_t ) IPC_GET_ARG1( * call )
  61. #define IPC_GET_PROTO( call )       ( services_t ) IPC_GET_ARG2( * call )
  62. #define IPC_GET_SERVICE( call )     ( services_t ) IPC_GET_ARG3( * call )
  63.  
  64. arp_globals_t   arp_globals;
  65.  
  66. DEVICE_MAP_IMPLEMENT( arp_cache, arp_device_t )
  67.  
  68. INT_MAP_IMPLEMENT( arp_protos, arp_proto_t )
  69.  
  70. GENERIC_CHAR_MAP_IMPLEMENT( arp_addr, measured_string_t )
  71.  
  72. int arp_proto_create( arp_proto_ref * proto, services_t service, measured_string_ref address );
  73. int arp_device_message( device_id_t device_id, services_t service, services_t protocol, measured_string_ref address );
  74. measured_string_ref arp_translate_message( device_id_t device, services_t protocol, measured_string_ref target );
  75. int arp_receive_message( device_id_t device_id, packet_t packet );
  76. int arp_clear_device_message( device_id_t device_id );
  77. void clear_device( arp_device_ref device );
  78. int arp_clean_cache_message( void );
  79. void arp_receiver( ipc_callid_t iid, ipc_call_t * icall );
  80.  
  81. /** Initializes the ARP module.
  82.  */
  83. int arp_initialize( void ){
  84.     arp_cache_initialize( & arp_globals.cache );
  85.     return EOK;
  86. }
  87.  
  88. int arp_proto_create( arp_proto_ref * proto, services_t service, measured_string_ref address ){
  89.     ERROR_DECLARE;
  90.  
  91.     * proto = ( arp_proto_ref ) malloc( sizeof( arp_proto_t ));
  92.     if( !( * proto )) return ENOMEM;
  93.     ( ** proto ).service = service;
  94.     ( ** proto ).addr = address;
  95.     ( ** proto ).addr_data = address->value;
  96.     if( ERROR_OCCURED( arp_addr_initialize( &( ** proto).addresses ))){
  97.         free( * proto );
  98.         return ERROR_CODE;
  99.     }
  100.     return EOK;
  101. }
  102.  
  103. int arp_device_message( device_id_t device_id, services_t service, services_t protocol, measured_string_ref address ){
  104.     ERROR_DECLARE;
  105.  
  106.     arp_device_ref  device;
  107.     aid_t           message;
  108.     ipc_call_t      answer;
  109.     ipcarg_t        result;
  110.     arp_proto_ref   proto;
  111.  
  112.     // an existing device?
  113.     device = arp_cache_find( & arp_globals.cache, device_id );
  114.     if( device ){
  115.         if( device->service != service ) return EEXIST;
  116.         proto = arp_protos_find( & device->protos, protocol );
  117.         if( proto ){
  118.             free( proto->addr );
  119.             free( proto->addr_data );
  120.             proto->addr = address;
  121.             proto->addr_data = address->value;
  122.         }else{
  123.             ERROR_PROPAGATE( arp_proto_create( & proto, protocol, address ));
  124.             if( ERROR_OCCURED( arp_protos_add( & device->protos, proto->service, proto ))){
  125.                 free( proto );
  126.                 return ERROR_CODE;
  127.             }
  128.         }
  129.         return EOK;
  130.     }else{
  131.         // create a new device
  132.         device = ( arp_device_ref ) malloc( sizeof( arp_device_t ));
  133.         if( ! device ) return ENOMEM;
  134.         device->device_id = device_id;
  135.         if( ERROR_OCCURED( arp_protos_initialize( & device->protos ))
  136.         || ERROR_OCCURED( arp_proto_create( & proto, protocol, address ))){
  137.             free( device );
  138.             return ERROR_CODE;
  139.         }
  140.         if( ERROR_OCCURED( arp_protos_add( & device->protos, proto->service, proto ))){
  141.             arp_protos_destroy( & device->protos );
  142.             free( device );
  143.             return ERROR_CODE;
  144.         }
  145.         device->service = service;
  146.         // bind the new one
  147.         device->phone = bind_service( device->service, device->device_id, SERVICE_ARP, 0, arp_receiver );
  148.         // get packet dimensions
  149.         if( ERROR_OCCURED( async_req_1_3( device->phone, NET_NIL_PACKET_SPACE, device_id, & device->prefix, & device->content, & device->sufix ))){
  150.             arp_protos_destroy( & device->protos );
  151.             free( device );
  152.             return ERROR_CODE;
  153.         }
  154.         // get hardware address
  155.         message = async_send_1( device->phone, NET_NIL_ADDR, device->device_id, & answer );
  156.         if( ERROR_OCCURED( measured_strings_return( device->phone, & device->addr, & device->addr_data, 1 ))){
  157.             arp_protos_destroy( & device->protos );
  158.             free( device );
  159.             async_wait_for( message, NULL );
  160.             return ERROR_CODE;
  161.         }
  162.         async_wait_for( message, & result );
  163.         if( ERROR_OCCURED( result )){
  164.             free( device->addr );
  165.             free( device->addr_data );
  166.             arp_protos_destroy( & device->protos );
  167.             free( device );
  168.             return ERROR_CODE;
  169.         }
  170.         // get broadcast address
  171.         message = async_send_1( device->phone, NET_NIL_BROADCAST_ADDR, device->device_id, & answer );
  172.         if( ERROR_OCCURED( measured_strings_return( device->phone, & device->broadcast_addr, & device->broadcast_data, 1 ))){
  173.             free( device->addr );
  174.             free( device->addr_data );
  175.             arp_protos_destroy( & device->protos );
  176.             free( device );
  177.             async_wait_for( message, NULL );
  178.             return ERROR_CODE;
  179.         }
  180.         async_wait_for( message, & result );
  181.         // add to the cache
  182.         if( ERROR_OCCURED( result )
  183.         || ERROR_OCCURED( arp_cache_add( & arp_globals.cache, device->device_id, device ))){
  184.             free( device->addr );
  185.             free( device->addr_data );
  186.             free( device->broadcast_addr );
  187.             free( device->broadcast_data );
  188.             arp_protos_destroy( & device->protos );
  189.             free( device );
  190.             return ERROR_CODE;
  191.         }
  192.     }
  193.     return EOK;
  194. }
  195.  
  196. measured_string_ref arp_translate_message( device_id_t device_id, services_t protocol, measured_string_ref target ){
  197. //  ERROR_DECLARE;
  198.  
  199.     arp_device_ref      device;
  200.     arp_proto_ref       proto;
  201.     measured_string_ref addr;
  202.     size_t              length;
  203.     packet_t            packet;
  204.     arp_header_ref      header;
  205.  
  206.     if( ! target ) return NULL;
  207.     device = arp_cache_find( & arp_globals.cache, device_id );
  208.     if( ! device ) return NULL;
  209.     proto = arp_protos_find( & device->protos, protocol );
  210.     if(( ! proto ) || ( proto->addr->length != target->length )) return NULL;
  211.     addr = arp_addr_find( & proto->addresses, target->value, target->length );
  212.     if( addr ) return addr;
  213.     // ARP packet content size = header + ( address + translation ) * 2
  214.     length = 8 + ( CONVERT_SIZE( char, uint8_t, proto->addr->length ) + CONVERT_SIZE( char, uint8_t, device->addr->length )) * 2;
  215.     if( length > device->content ){
  216.         return NULL;
  217.     }
  218.     packet = packet_create( device->prefix, length, device->sufix );
  219.     if( ! packet ) return NULL;
  220.     header = ( arp_header_ref ) packet_append( packet, length );
  221.     header->hardware = device->hardware;
  222.     header->hardware_length = device->addr->length;
  223.     header->protocol = protocol_map( device->service, protocol );
  224.     header->protocol_length = proto->addr->length;
  225.     header->operation = ARPOP_REQUEST;
  226.     length = sizeof( arp_header_t );
  227.     memcpy((( uint8_t * ) header ) + length, device->addr->value, device->addr->length );
  228.     length += device->addr->length;
  229.     memcpy((( uint8_t * ) header ) + length, proto->addr->value, proto->addr->length );
  230.     length += proto->addr->length;
  231.     memset((( uint8_t * ) header ) + length, 0, device->addr->length );
  232.     length += device->addr->length;
  233.     memcpy((( uint8_t * ) header ) + length, target->value, target->length );
  234.     // TODO send to the device->broadcast_addr as arp protocol
  235.     packet_send( packet, device->phone );
  236.     return NULL;
  237. }
  238.  
  239. int arp_receive_message( device_id_t device_id, packet_t packet ){
  240.     ERROR_DECLARE;
  241.  
  242.     size_t              length;
  243.     arp_header_ref      header;
  244.     arp_device_ref      device;
  245.     arp_proto_ref       proto;
  246. //  arp_addr_ref        addr;
  247.     measured_string_ref hw_source;
  248. /*  measured_string_t   proto_target;
  249.     aid_t               message;
  250.     ipcarg_t            result;
  251.     int                 index;
  252.     ipc_call_t          answer;
  253. */  int8_t *            src_hw;
  254.     int8_t *            src_proto;
  255.     int8_t *            des_hw;
  256.     int8_t *            des_proto;
  257.  
  258.     length = packet_get_data_length( packet );
  259.     if( length <= sizeof( arp_header_t )) return EINVAL;
  260.     device = arp_cache_find( & arp_globals.cache, device_id );
  261.     if( ! device ) return ENOENT;
  262.     header = ( arp_header_ref ) packet_get_data( packet );
  263.     if( header->hardware != device->hardware ) return EINVAL;
  264.     if( length < sizeof( arp_header_t ) + ( header->hardware_length + header->protocol_length ) * 2 ) return EINVAL;
  265.     proto = arp_protos_find( & device->protos, protocol_unmap( device->service, header->protocol ));
  266.     if( ! proto ) return ENOENT;
  267.     src_hw = (( int8_t * ) header ) + sizeof( arp_header_t );
  268.     src_proto = src_hw + header->hardware_length;
  269.     des_hw = src_proto + header->protocol_length;
  270.     des_proto = des_hw + header->hardware_length;
  271.     hw_source = arp_addr_find( & proto->addresses, src_proto, header->protocol_length );
  272.     // exists?
  273.     if( hw_source ){
  274.         if( hw_source->length != header->hardware_length ) return EINVAL;
  275.         memcpy( hw_source->value, src_hw, header->hardware_length );
  276.     }
  277.     // is my protocol address?
  278. /*  proto_target.value = des_proto;
  279.     proto_target.length = header->protocol_length;
  280.     // TODO send necessary?
  281.     message = async_send_0( proto->phone, NET_IL_MY_ADDR, & answer );
  282.     if( ERROR_OCCURED( measured_strings_send( device->phone, & proto_target, 1 ))){
  283.         async_wait_for( message, NULL );
  284.         return ERROR_CODE;
  285.     }
  286.     async_wait_for( message, & result );
  287.     if( result == EOK ){
  288. */  if( proto->addr->length != header->hardware_length ) return EINVAL;
  289.     if( ! strncmp( proto->addr->value, des_proto, proto->addr->length )){
  290.         // not already upadted?
  291.         if( ! hw_source ){
  292.             hw_source = measured_string_create_bulk( src_hw, header->hardware_length );
  293.             if( ! hw_source ) return ENOMEM;
  294.             ERROR_PROPAGATE( arp_addr_add( & proto->addresses, src_proto, header->protocol_length, hw_source ));
  295.         }
  296.         if( header->operation == ARPOP_REQUEST ){
  297.             header->operation = ARPOP_REPLY;
  298. /*          for( index = 0; index + header->hardware_length < header->protocol_length; index += header->hardware_length ){
  299.                 memcpy( src_hw, src_proto + index, header->hardware_length );
  300.                 memcpy( src_proto + index, des_proto + index, header->hardware_length );
  301.                 memcpy( des_proto + index, src_hw, header->hardware_length );
  302.             }
  303.             memcpy( src_hw, src_proto + index, header->hardware_length - header->protocol_length );
  304.             memcpy( src_proto + index, des_proto + index, header->hardware_length - header->protocol_length );
  305.             memcpy( des_proto + index, src_hw, header->hardware_length - header->protocol_length );
  306.             memcpy( src_hw, des_hw, header->hardware_length );
  307.             memcpy( des_hw, hw_source->value, hw_source->length );
  308. */          memcpy( des_proto, src_proto, header->protocol_length );
  309.             memcpy( src_proto, proto->addr->value, header->protocol_length );
  310.             memcpy( src_hw, des_hw, header->hardware_length );
  311.             memcpy( des_hw, hw_source->value, hw_source->length );
  312.             // TODO send to the hw_source as arp protocol
  313.             packet_send( packet, device->phone );
  314.         }
  315.     }
  316.     return EOK;
  317. }
  318.  
  319. int arp_clear_device_message( device_id_t device_id ){
  320.     arp_device_ref  device;
  321.  
  322.     device = arp_cache_find( & arp_globals.cache, device_id );
  323.     if( ! device ) return ENOENT;
  324.     clear_device( device );
  325.     return EOK;
  326. }
  327.  
  328. void clear_device( arp_device_ref device ){
  329.     int             count;
  330.     arp_proto_ref   proto;
  331.  
  332.     count = arp_protos_count( & device->protos );
  333.     while( count > 0 ){
  334.         proto = arp_protos_get_index( & device->protos, count );
  335.         if( proto->addr ) free( proto->addr );
  336.         if( proto->addr_data ) free( proto->addr_data );
  337.         arp_addr_destroy( & proto->addresses );
  338.         -- count;
  339.     }
  340.     arp_protos_clear( & device->protos );
  341. }
  342.  
  343. int arp_clean_cache_message( void ){
  344.     int             count;
  345.     arp_device_ref  device;
  346.  
  347.     count = arp_cache_count( & arp_globals.cache );
  348.     while( count > 0 ){
  349.         device = arp_cache_get_index( & arp_globals.cache, count );
  350.         if( device ){
  351.             clear_device( device );
  352.             if( device->broadcast_addr ) free( device->broadcast_addr );
  353.             if( device->broadcast_data ) free( device->broadcast_data );
  354.         }
  355.     }
  356.     arp_cache_clear( & arp_globals.cache );
  357.     return EOK;
  358. }
  359.  
  360. int arp_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
  361.     ERROR_DECLARE;
  362.  
  363. //  packet_t            packet;
  364.     measured_string_ref address;
  365.     measured_string_ref translation;
  366.     char *              data;
  367.  
  368.     * answer_count = 0;
  369.     switch( IPC_GET_METHOD( * call )){
  370.         case IPC_M_PHONE_HUNGUP:
  371.             return EOK;
  372.         case NET_ARP_DEVICE:
  373.             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
  374.             if( ERROR_OCCURED( arp_device_message( IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), IPC_GET_PROTO( call ), address ))){
  375.                 free( address );
  376.                 free( data );
  377.             }
  378.             return ERROR_CODE;
  379.         case NET_ARP_TRANSLATE:
  380.             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
  381.             translation = arp_translate_message( IPC_GET_DEVICE( call ), IPC_GET_PROTO( call ), address );
  382.             free( address );
  383.             free( data );
  384.             if( ! translation ) return ENOENT;
  385.             return measured_strings_reply( translation, 1 );
  386.         case NET_ARP_CLEAR_DEVICE:
  387.             return arp_clear_device_message( IPC_GET_DEVICE( call ));
  388.         case NET_ARP_CLEAN_CACHE:
  389.             return arp_clean_cache_message();
  390.     }
  391.     return ENOTSUP;
  392. }
  393.  
  394. void arp_receiver( ipc_callid_t iid, ipc_call_t * icall ){
  395.     ERROR_DECLARE;
  396.  
  397.     ipc_callid_t    callid;
  398.     ipc_call_t      call;
  399. //  int             result;
  400.     packet_t        packet;
  401.  
  402.     /*
  403.      * Accept the connection
  404.      *  - Answer the first IPC_M_CONNECT_ME_TO call.
  405.      */
  406.     //TODO auto accept?
  407.     //ipc_answer_0( iid, EOK );
  408.  
  409.     while( true ){
  410.         callid = async_get_call( & call );
  411.         switch( IPC_GET_METHOD( call )){
  412.             case NET_IL_DEVICE_STATE:
  413.                 //TODO clear device if off?
  414.                 break;
  415.             case NET_IL_RECEIVED:
  416.                 if( ! ERROR_OCCURED( packet_receive( & packet ))){
  417.                     ERROR_CODE = arp_receive_message( IPC_GET_DEVICE( & call ), packet );
  418.                 }
  419.                 ipc_answer_0( callid, ERROR_CODE );
  420.                 break;
  421.             default:
  422.                 ipc_answer_0( callid, ENOTSUP );
  423.         }
  424.     }
  425. }
  426.  
  427. /** @}
  428.  */
  429.