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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 arp
  30.  *  @{
  31.  */
  32.  
  33. /** @file
  34.  *  ARP module implementation.
  35.  *  @see arp.h
  36.  */
  37.  
  38. #include <async.h>
  39. #include <malloc.h>
  40. #include <mem.h>
  41. #include <rwlock.h>
  42. #include <stdio.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/device.h"
  53. #include "../../include/nil_messages.h"
  54. #include "../../include/protocol_map.h"
  55.  
  56. #include "../../structures/measured_strings.h"
  57. #include "../../structures/packet/packet.h"
  58. #include "../../structures/packet/packet_client.h"
  59.  
  60. #include "arp.h"
  61. #include "arp_header.h"
  62. #include "arp_oc.h"
  63. //#include "arp_messages.h"
  64. #include "arp_module.h"
  65.  
  66. /** Returns the protocol service message parameter.
  67.  */
  68. #define ARP_GET_PROTO( call )       ( services_t ) IPC_GET_ARG2( * call )
  69.  
  70. /** ARP global data.
  71.  */
  72. arp_globals_t   arp_globals;
  73.  
  74. /** Creates new protocol specific data.
  75.  *  @param proto Protocol specific data. Output parameter.
  76.  *  @param service Protocol module service. Input parameter.
  77.  *  @param address Actual protocol device address. Input parameter.
  78.  *  @returns EOK on success.
  79.  *  @returns ENOMEM if there is not enough memory left.
  80.  */
  81. int arp_proto_create( arp_proto_ref * proto, services_t service, measured_string_ref address );
  82.  
  83. /** Registers the device.
  84.  *  Creates new device entry in the cache or updates the protocol address if the device with the device identifier and the driver service exists.
  85.  *  @param device_id The device identifier. Input parameter.
  86.  *  @param service The device driver service. Input parameter.
  87.  *  @param protocol The protocol service. Input parameter.
  88.  *  @param address The actual device protocol address.
  89.  *  @returns EOK on success.
  90.  *  @returns EEXIST if another device with the same device identifier and different driver service exists.
  91.  *  @returns ENOMEM if there is not enough memory left.
  92.  *  @returns Other error codes as defined for the measured_strings_return() function.
  93.  */
  94. int arp_device_message( device_id_t device_id, services_t service, services_t protocol, measured_string_ref address );
  95.  
  96. /** Returns the hardware address for the given protocol address.
  97.  *  Sends the ARP request packet if the hardware address is not found in the cache.
  98.  *  @param device_id The device identifier. Input parameter.
  99.  *  @param protocol The protocol service. Input parameter.
  100.  *  @param target The target protocol address. Input parameter.
  101.  *  @returns The hardware address of the target.
  102.  *  @returns NULL if the target parameter is NULL.
  103.  *  @returns NULL if the device is not found.
  104.  *  @returns NULL if the device packet is too small to send a&nbsp;request.
  105.  *  @returns NULL if the hardware address is not found in the cache.
  106.  */
  107. measured_string_ref arp_translate_message( device_id_t device_id, services_t protocol, measured_string_ref target );
  108.  
  109. /** Processes the received ARP packet.
  110.  *  Updates the source hardware address if the source entry exists or the packet is targeted to my protocol address.
  111.  *  Responses to the ARP request if the packet is the ARP request and is targeted to my address.
  112.  *  @param device_id The source device identifier. Input parameter.
  113.  *  @param packet The received packet. Input/output parameter.
  114.  *  @returns EOK on success.
  115.  *  @returns EINVAL if the packet is too small to carry the ARP packet.
  116.  *  @returns EINVAL if the received address lengths differs from the registered values.
  117.  *  @returns ENOENT if the device is not found in the cache.
  118.  *  @returns ENOENT if the protocol for the device is not found in the cache.
  119.  *  @returns ENOMEM if there is not enough memory left.
  120.  */
  121. int arp_receive_message( device_id_t device_id, packet_t packet );
  122.  
  123. /** Clears the device specific data from the cache.
  124.  *  @param device_id The device identifier. Input parameter.
  125.  *  @returns EOK on success.
  126.  *  @returns ENOENT  if the device is not found in the cache.
  127.  */
  128. int arp_clear_device_message( device_id_t device_id );
  129.  
  130. /** Clears the device specific data.
  131.  *  @param device The device specific data.
  132.  */
  133. void    clear_device( arp_device_ref device );
  134.  
  135. /** Clears the whole cache.
  136.  *  @returns EOK on success.
  137.  */
  138. int arp_clean_cache_message( void );
  139.  
  140. /** Processes IPC messages from the registered device driver modules in an infinite loop.
  141.  *  @param iid The message identifier. Input parameter.
  142.  *  @param icall The message parameters. Input/output parameter.
  143.  */
  144. void    arp_receiver( ipc_callid_t iid, ipc_call_t * icall );
  145.  
  146. DEVICE_MAP_IMPLEMENT( arp_cache, arp_device_t )
  147.  
  148. INT_MAP_IMPLEMENT( arp_protos, arp_proto_t )
  149.  
  150. GENERIC_CHAR_MAP_IMPLEMENT( arp_addr, measured_string_t )
  151.  
  152. int arp_initialize( void ){
  153.     ERROR_DECLARE;
  154.  
  155.     rwlock_initialize( & arp_globals.lock );
  156.     rwlock_write_lock( & arp_globals.lock );
  157.     ERROR_PROPAGATE( arp_cache_initialize( & arp_globals.cache ));
  158.     rwlock_write_unlock( & arp_globals.lock );
  159.     return EOK;
  160. }
  161.  
  162. int arp_proto_create( arp_proto_ref * proto, services_t service, measured_string_ref address ){
  163.     ERROR_DECLARE;
  164.  
  165.     * proto = ( arp_proto_ref ) malloc( sizeof( arp_proto_t ));
  166.     if( !( * proto )) return ENOMEM;
  167.     ( ** proto ).service = service;
  168.     ( ** proto ).addr = address;
  169.     ( ** proto ).addr_data = address->value;
  170.     if( ERROR_OCCURRED( arp_addr_initialize( &( ** proto).addresses ))){
  171.         free( * proto );
  172.         return ERROR_CODE;
  173.     }
  174.     return EOK;
  175. }
  176.  
  177. int arp_device_message( device_id_t device_id, services_t service, services_t protocol, measured_string_ref address ){
  178.     ERROR_DECLARE;
  179.  
  180.     arp_device_ref  device;
  181.     arp_proto_ref   proto;
  182.     int             index;
  183.  
  184.     rwlock_write_lock( & arp_globals.lock );
  185.     // an existing device?
  186.     device = arp_cache_find( & arp_globals.cache, device_id );
  187.     if( device ){
  188.         if( device->service != service ){
  189.             printf( "\nDevice %d already exists", device->device_id );
  190.             rwlock_write_unlock( & arp_globals.lock );
  191.             return EEXIST;
  192.         }
  193.         proto = arp_protos_find( & device->protos, protocol );
  194.         if( proto ){
  195.             free( proto->addr );
  196.             free( proto->addr_data );
  197.             proto->addr = address;
  198.             proto->addr_data = address->value;
  199.         }else{
  200.             if( ERROR_OCCURRED( arp_proto_create( & proto, protocol, address ))){
  201.                 rwlock_write_unlock( & arp_globals.lock );
  202.                 return ERROR_CODE;
  203.             }
  204.             index = arp_protos_add( & device->protos, proto->service, proto );
  205.             if( index < 0 ){
  206.                 rwlock_write_unlock( & arp_globals.lock );
  207.                 free( proto );
  208.                 return index;
  209.             }
  210.         }
  211.         printf( "\nCache of the existing device %d cleaned", device->device_id );
  212.     }else{
  213.         index = hardware_map( service );
  214.         if( ! index ) return ENOENT;
  215.         // create a new device
  216.         device = ( arp_device_ref ) malloc( sizeof( arp_device_t ));
  217.         if( ! device ){
  218.             rwlock_write_unlock( & arp_globals.lock );
  219.             return ENOMEM;
  220.         }
  221.         device->hardware = index;
  222.         device->device_id = device_id;
  223.         if( ERROR_OCCURRED( arp_protos_initialize( & device->protos ))
  224.         || ERROR_OCCURRED( arp_proto_create( & proto, protocol, address ))){
  225.             rwlock_write_unlock( & arp_globals.lock );
  226.             free( device );
  227.             return ERROR_CODE;
  228.         }
  229.         index = arp_protos_add( & device->protos, proto->service, proto );
  230.         if( index < 0 ){
  231.             rwlock_write_unlock( & arp_globals.lock );
  232.             arp_protos_destroy( & device->protos );
  233.             free( device );
  234.             return index;
  235.         }
  236.         device->service = service;
  237.         // bind the new one
  238.         device->phone = bind_service( device->service, device->device_id, SERVICE_ARP, 0, arp_receiver );
  239.         if( device->phone < 0 ){
  240.             rwlock_write_unlock( & arp_globals.lock );
  241.             arp_protos_destroy( & device->protos );
  242.             free( device );
  243.             return EREFUSED;
  244.         }
  245.         // get packet dimensions
  246.         if( ERROR_OCCURRED( nil_packet_size_req( device->phone, device_id, & device->addr_len, & device->prefix, & device->content, & device->suffix ))){
  247.             rwlock_write_unlock( & arp_globals.lock );
  248.             arp_protos_destroy( & device->protos );
  249.             free( device );
  250.             return ERROR_CODE;
  251.         }
  252.         // get hardware address
  253.         if( ERROR_OCCURRED( nil_get_addr( device->phone, device_id, & device->addr, & device->addr_data ))){
  254.             rwlock_write_unlock( & arp_globals.lock );
  255.             arp_protos_destroy( & device->protos );
  256.             free( device );
  257.             return ERROR_CODE;
  258.         }
  259.         // get broadcast address
  260.         if( ERROR_OCCURRED( nil_get_broadcast_addr( device->phone, device_id, & device->broadcast_addr, & device->broadcast_data ))){
  261.             rwlock_write_unlock( & arp_globals.lock );
  262.             free( device->addr );
  263.             free( device->addr_data );
  264.             arp_protos_destroy( & device->protos );
  265.             free( device );
  266.             return ERROR_CODE;
  267.         }
  268.         if( ERROR_OCCURRED( arp_cache_add( & arp_globals.cache, device->device_id, device ))){
  269.             rwlock_write_unlock( & arp_globals.lock );
  270.             free( device->addr );
  271.             free( device->addr_data );
  272.             free( device->broadcast_addr );
  273.             free( device->broadcast_data );
  274.             arp_protos_destroy( & device->protos );
  275.             free( device );
  276.             return ERROR_CODE;
  277.         }
  278.         printf( "\nNew device registered:\n\tid\t= %d\n\ttype\t= 0x%x\n\tservice\t= %d", device->device_id, device->hardware, device->service );
  279.     }
  280.     rwlock_write_unlock( & arp_globals.lock );
  281.     return EOK;
  282. }
  283.  
  284. measured_string_ref arp_translate_message( device_id_t device_id, services_t protocol, measured_string_ref target ){
  285.     arp_device_ref      device;
  286.     arp_proto_ref       proto;
  287.     measured_string_ref addr;
  288.     size_t              length;
  289.     packet_t            packet;
  290.     arp_header_ref      header;
  291.  
  292.     if( ! target ) return NULL;
  293.     device = arp_cache_find( & arp_globals.cache, device_id );
  294.     if( ! device ) return NULL;
  295.     proto = arp_protos_find( & device->protos, protocol );
  296.     if(( ! proto ) || ( proto->addr->length != target->length )) return NULL;
  297.     addr = arp_addr_find( & proto->addresses, target->value, target->length );
  298.     if( addr ) return addr;
  299.     // ARP packet content size = header + ( address + translation ) * 2
  300.     length = 8 + ( CONVERT_SIZE( char, uint8_t, proto->addr->length ) + CONVERT_SIZE( char, uint8_t, device->addr->length )) * 2;
  301.     if( length > device->content ) return NULL;
  302.     packet = packet_get_4( arp_globals.networking_phone, device->addr_len, device->prefix, length, device->suffix );
  303.     if( ! packet ) return NULL;
  304.     header = ( arp_header_ref ) packet_suffix( packet, length );
  305.     header->hardware = htons( device->hardware );
  306.     header->hardware_length = device->addr->length;
  307.     header->protocol = htons( protocol_map( device->service, protocol ));
  308.     header->protocol_length = proto->addr->length;
  309.     header->operation = htons( ARPOP_REQUEST );
  310.     length = sizeof( arp_header_t );
  311.     memcpy((( uint8_t * ) header ) + length, device->addr->value, device->addr->length );
  312.     length += device->addr->length;
  313.     memcpy((( uint8_t * ) header ) + length, proto->addr->value, proto->addr->length );
  314.     length += proto->addr->length;
  315.     bzero((( uint8_t * ) header ) + length, device->addr->length );
  316.     length += device->addr->length;
  317.     memcpy((( uint8_t * ) header ) + length, target->value, target->length );
  318.     packet_set_addr( packet, ( uint8_t * ) device->addr->value, ( uint8_t * ) device->broadcast_addr->value, CONVERT_SIZE( char, uint8_t, device->addr->length ));
  319.     nil_send_msg( device->phone, device_id, packet, SERVICE_ARP );
  320.     return NULL;
  321. }
  322.  
  323. int arp_receive_message( device_id_t device_id, packet_t packet ){
  324.     ERROR_DECLARE;
  325.  
  326.     size_t              length;
  327.     arp_header_ref      header;
  328.     arp_device_ref      device;
  329.     arp_proto_ref       proto;
  330.     measured_string_ref hw_source;
  331.     uint8_t *           src_hw;
  332.     uint8_t *           src_proto;
  333.     uint8_t *           des_hw;
  334.     uint8_t *           des_proto;
  335.  
  336.     length = packet_get_data_length( packet );
  337.     if( length <= sizeof( arp_header_t )) return EINVAL;
  338.     device = arp_cache_find( & arp_globals.cache, device_id );
  339.     if( ! device ) return ENOENT;
  340.     header = ( arp_header_ref ) packet_get_data( packet );
  341.     if(( ntohs( header->hardware ) != device->hardware )
  342.     || ( length < sizeof( arp_header_t ) + ( header->hardware_length + header->protocol_length ) * 2 )){
  343.         return EINVAL;
  344.     }
  345.     proto = arp_protos_find( & device->protos, protocol_unmap( device->service, ntohs( header->protocol )));
  346.     if( ! proto ) return ENOENT;
  347.     src_hw = (( uint8_t * ) header ) + sizeof( arp_header_t );
  348.     src_proto = src_hw + header->hardware_length;
  349.     des_hw = src_proto + header->protocol_length;
  350.     des_proto = des_hw + header->hardware_length;
  351.     hw_source = arp_addr_find( & proto->addresses, ( char * ) src_proto, CONVERT_SIZE( uint8_t, char, header->protocol_length ));
  352.     // exists?
  353.     if( hw_source ){
  354.         if( hw_source->length != CONVERT_SIZE( uint8_t, char, header->hardware_length )){
  355.             return EINVAL;
  356.         }
  357.         memcpy( hw_source->value, src_hw, hw_source->length );
  358.     }
  359.     // is my protocol address?
  360.     if( proto->addr->length != CONVERT_SIZE( uint8_t, char, header->hardware_length )){
  361.         return EINVAL;
  362.     }
  363.     if( ! strncmp( proto->addr->value, ( char * ) des_proto, proto->addr->length )){
  364.         // not already upadted?
  365.         if( ! hw_source ){
  366.             hw_source = measured_string_create_bulk(( char * ) src_hw, CONVERT_SIZE( uint8_t, char, header->hardware_length ));
  367.             if( ! hw_source ) return ENOMEM;
  368.             ERROR_PROPAGATE( arp_addr_add( & proto->addresses, ( char * ) src_proto, CONVERT_SIZE( uint8_t, char, header->protocol_length ), hw_source ));
  369.         }
  370.         if( ntohs( header->operation ) == ARPOP_REQUEST ){
  371.             header->operation = htons( ARPOP_REPLY );
  372.             memcpy( des_proto, src_proto, header->protocol_length );
  373.             memcpy( src_proto, proto->addr->value, header->protocol_length );
  374.             memcpy( src_hw, des_hw, header->hardware_length );
  375.             memcpy( des_hw, hw_source->value, header->hardware_length );
  376.             packet_set_addr( packet, src_hw, des_hw, header->hardware_length );
  377.             nil_send_msg( device->phone, device_id, packet, SERVICE_ARP );
  378.         }else{
  379.             pq_release( arp_globals.networking_phone, packet_get_id( packet ));
  380.         }
  381.     }
  382.     return EOK;
  383. }
  384.  
  385. int arp_clear_device_message( device_id_t device_id ){
  386.     arp_device_ref  device;
  387.  
  388.     rwlock_write_lock( & arp_globals.lock );
  389.     device = arp_cache_find( & arp_globals.cache, device_id );
  390.     if( ! device ){
  391.         rwlock_write_unlock( & arp_globals.lock );
  392.         return ENOENT;
  393.     }
  394.     clear_device( device );
  395.     printf( "\nDevice %d cleared", device_id );
  396.     rwlock_write_unlock( & arp_globals.lock );
  397.     return EOK;
  398. }
  399.  
  400. void clear_device( arp_device_ref device ){
  401.     int             count;
  402.     arp_proto_ref   proto;
  403.  
  404.     for( count = arp_protos_count( & device->protos ) - 1; count >= 0; -- count ){
  405.         proto = arp_protos_get_index( & device->protos, count );
  406.         if( proto ){
  407.             if( proto->addr ) free( proto->addr );
  408.             if( proto->addr_data ) free( proto->addr_data );
  409.             arp_addr_destroy( & proto->addresses );
  410.         }
  411.     }
  412.     arp_protos_clear( & device->protos );
  413. }
  414.  
  415. int arp_clean_cache_message( void ){
  416.     int             count;
  417.     arp_device_ref  device;
  418.  
  419.     rwlock_write_lock( & arp_globals.lock );
  420.     for( count = arp_cache_count( & arp_globals.cache ) - 1; count >= 0; -- count ){
  421.         device = arp_cache_get_index( & arp_globals.cache, count );
  422.         if( device ){
  423.             clear_device( device );
  424.             if( device->addr_data ) free( device->addr_data );
  425.             if( device->broadcast_data ) free( device->broadcast_data );
  426.         }
  427.     }
  428.     arp_cache_clear( & arp_globals.cache );
  429.     rwlock_write_unlock( & arp_globals.lock );
  430.     printf( "\nCache cleaned" );
  431.     return EOK;
  432. }
  433.  
  434. int arp_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
  435.     ERROR_DECLARE;
  436.  
  437.     measured_string_ref address;
  438.     measured_string_ref translation;
  439.     char *              data;
  440.  
  441. //  printf( "\nmessage %d - %d", IPC_GET_METHOD( * call ), NET_ARP_FIRST );
  442.     * answer_count = 0;
  443.     switch( IPC_GET_METHOD( * call )){
  444.         case IPC_M_PHONE_HUNGUP:
  445.             return EOK;
  446.         case NET_ARP_DEVICE:
  447.             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
  448.             if( ERROR_OCCURRED( arp_device_message( IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), ARP_GET_PROTO( call ), address ))){
  449.                 free( address );
  450.                 free( data );
  451.             }
  452.             return ERROR_CODE;
  453.         case NET_ARP_TRANSLATE:
  454.             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
  455.             rwlock_read_lock( & arp_globals.lock );
  456.             translation = arp_translate_message( IPC_GET_DEVICE( call ), ARP_GET_PROTO( call ), address );
  457.             free( address );
  458.             free( data );
  459.             if( ! translation ){
  460.                 rwlock_read_unlock( & arp_globals.lock );
  461.                 return ENOENT;
  462.             }
  463.             ERROR_CODE = measured_strings_reply( translation, 1 );
  464.             rwlock_read_unlock( & arp_globals.lock );
  465.             return ERROR_CODE;
  466.         case NET_ARP_CLEAR_DEVICE:
  467.             return arp_clear_device_message( IPC_GET_DEVICE( call ));
  468.         case NET_ARP_CLEAN_CACHE:
  469.             return arp_clean_cache_message();
  470.     }
  471.     return ENOTSUP;
  472. }
  473.  
  474. void arp_receiver( ipc_callid_t iid, ipc_call_t * icall ){
  475.     ERROR_DECLARE;
  476.  
  477.     packet_t        packet;
  478.  
  479.     while( true ){
  480.         switch( IPC_GET_METHOD( * icall )){
  481.             case NET_IL_DEVICE_STATE:
  482.                 // do nothing - keep the cache
  483.                 ipc_answer_0( iid, EOK );
  484.                 break;
  485.             case NET_IL_RECEIVED:
  486.                 if( ! ERROR_OCCURRED( packet_translate( arp_globals.networking_phone, & packet, IPC_GET_PACKET( icall )))){
  487.                     rwlock_read_lock( & arp_globals.lock );
  488.                     ERROR_CODE = arp_receive_message( IPC_GET_DEVICE( icall ), packet );
  489.                     rwlock_read_unlock( & arp_globals.lock );
  490.                 }
  491.                 ipc_answer_0( iid, ERROR_CODE );
  492.                 break;
  493.             default:
  494.                 ipc_answer_0( iid, ENOTSUP );
  495.         }
  496.         iid = async_get_call( icall );
  497.     }
  498. }
  499.  
  500. /** @}
  501.  */
  502.