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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 ip
  30.  *  @{
  31.  */
  32.  
  33. /** @file
  34.  */
  35.  
  36. #include <async.h>
  37. #include <errno.h>
  38. #include <stdio.h>
  39. #include <string.h>
  40.  
  41. #include <ipc/ipc.h>
  42. #include <ipc/services.h>
  43.  
  44. #include <sys/types.h>
  45.  
  46. #include "../../err.h"
  47. #include "../../messages.h"
  48. #include "../../modules.h"
  49.  
  50. #include "../../include/net_interface.h"
  51. #include "../../include/sockaddr.h"
  52. #include "../../include/socket.h"
  53. #include "../../include/byteorder.h"
  54. #include "../../include/crc.h"
  55. #include "../../include/device.h"
  56. #include "../../include/arp_interface.h"
  57. #include "../../include/nil_interface.h"
  58. #include "../../include/il_interface.h"
  59. #include "../../include/ip_client.h"
  60. #include "../../include/ip_interface.h"
  61. #include "../../include/tl_interface.h"
  62. #include "../../structures/measured_strings.h"
  63. #include "../../structures/module_map.h"
  64. #include "../../structures/packet/packet_client.h"
  65.  
  66. #include "../../nil/nil_messages.h"
  67.  
  68. #include "../il_messages.h"
  69.  
  70. #include "ip.h"
  71. #include "ip_header.h"
  72. #include "ip_messages.h"
  73. #include "ip_module.h"
  74.  
  75. #define DEFAULT_IPV     4
  76. #define IP_MIN_CONTENT  576
  77.  
  78. #define ARP_NAME                "arp"
  79. #define ARP_FILENAME            "/srv/arp"
  80.  
  81. #define IP_ADDR                         sizeof( in_addr_t )
  82. #define IP_PREFIX                       sizeof( ip_header_t )
  83. #define IP_SUFFIX                       0
  84. #define IP_MAX_CONTENT                  65535
  85. #define IP_HEADER_LENGTH( header )      (( header )->ihl * 4 )
  86. #define IP_TOTAL_LENGTH( header )       ntohs(( header )->total_length )
  87. #define IP_HEADER_DATA_LENGTH( header ) ( IP_TOTAL_LENGTH( header ) - IP_HEADER_LENGTH( header ))
  88. #define IP_HEADER_CHECKSUM( header )    ( htons( ip_checksum(( uint8_t * )( header ), IP_HEADER_LENGTH( header ))))
  89.  
  90. //zero is returned as 0xFFFF (not flipped)
  91. #define IP_HEADER_CHECKSUM_ZERO         0xFFFF
  92.  
  93. ip_globals_t    ip_globals;
  94.  
  95. DEVICE_MAP_IMPLEMENT( ip_netifs, ip_netif_t )
  96.  
  97. INT_MAP_IMPLEMENT( ip_protos, ip_proto_t )
  98.  
  99. GENERIC_FIELD_IMPLEMENT( ip_routes, ip_route_t )
  100.  
  101. int ip_device_state_msg( int il_phone, device_id_t device_id, device_state_t state );
  102. int ip_register( int protocol, services_t service, int phone, tl_received_msg_t tl_received_msg );
  103. int ip_netif_initialize( ip_netif_ref ip_netif );
  104.  
  105. int ip_send_route( packet_t packet, ip_netif_ref netif, ip_route_ref route, in_addr_t * src, in_addr_t dest );
  106. int ip_prepare_packet( in_addr_t * source, packet_t packet, measured_string_ref destination );
  107.  
  108. packet_t    ip_split_packet( packet_t packet, size_t prefix, size_t content, size_t suffix, size_t addr_len );
  109. int ip_fragment_packet( packet_t packet, size_t length, size_t prefix, size_t suffix, size_t addr_len );
  110. int ip_fragment_packet_data( packet_t packet, packet_t new_packet, ip_header_ref header, ip_header_ref new_header, size_t length, void * src, void * dest, size_t address_length );
  111. ip_header_ref   ip_create_middle_header( packet_t packet, ip_header_ref last );
  112. ip_header_ref   ip_create_last_header( packet_t packet, ip_header_ref first );
  113.  
  114. in_addr_t * ip_netif_addr( ip_netif_ref netif );
  115. ip_route_ref    ip_find_route( in_addr_t destination );
  116. ip_route_ref    ip_netif_find_route( ip_netif_ref netif, in_addr_t destination );
  117.  
  118. int ip_received_msg( device_id_t device_id, packet_t packet );
  119. int ip_process_packet( device_id_t device_id, packet_t packet );
  120. in_addr_t   ip_get_destination( ip_header_ref header );
  121. int ip_deliver_local( device_id_t device_id, packet_t packet, ip_header_ref header );
  122.  
  123. /** Computes the ip header checksum.
  124.  *  To compute the checksum of a new packet, the checksum header field must be zero.
  125.  *  To check the checksum of a received packet, the checksum may be left set.
  126.  *  The zero (0) value will returned in this case if valid.
  127.  *  @param data The header data. Input parameter.
  128.  *  @param length The header length in bytes. Input parameter.
  129.  *  @returns The internet protocol header checksum.
  130.  *  @returns IP_HEADER_CHECKSUM_ZERO if the computed checksum is zero.
  131.  */
  132. uint16_t ip_checksum( uint8_t * data, int length );
  133.  
  134. uint16_t ip_checksum( uint8_t * data, int length ){
  135.     uint16_t    checksum;
  136.  
  137.     checksum = compact_checksum(compute_checksum( 0, data, length ));
  138.  
  139.     // flip, zero is returned as 0xFFFF (not flipped)
  140.     return ( ~ checksum ) ? ~ checksum : IP_HEADER_CHECKSUM_ZERO;
  141. }
  142.  
  143. /** Initializes the module.
  144.  */
  145. int ip_initialize( async_client_conn_t client_connection ){
  146.     ERROR_DECLARE;
  147.  
  148.     ip_globals.packet_counter = 0;
  149.     ip_globals.gateway.address.s_addr = 0;
  150.     ip_globals.gateway.netmask.s_addr = 0;
  151.     ip_globals.gateway.gateway.s_addr = 0;
  152.     ip_globals.gateway.netif = NULL;
  153.     ERROR_PROPAGATE( ip_netifs_initialize( & ip_globals.netifs ));
  154.     ERROR_PROPAGATE( ip_protos_initialize( & ip_globals.protos ));
  155.     ip_globals.client_connection = client_connection;
  156.     ERROR_PROPAGATE( modules_initialize( & ip_globals.modules ));
  157.     ERROR_PROPAGATE( add_module( NULL, & ip_globals.modules, ARP_NAME, ARP_FILENAME, SERVICE_ARP, arp_task_get_id(), arp_connect_module ));
  158.     return EOK;
  159. }
  160.  
  161. int ip_device_req( int il_phone, device_id_t device_id, services_t netif ){
  162.     ERROR_DECLARE;
  163.  
  164.     ip_netif_ref    ip_netif;
  165.     ip_route_ref    route;
  166.     int             index;
  167.     char *          data;
  168.  
  169.     ip_netif = ( ip_netif_ref ) malloc( sizeof( ip_netif_t ));
  170.     if( ! ip_netif ) return ENOMEM;
  171.     if( ERROR_OCCURRED( ip_routes_initialize( & ip_netif->routes ))){
  172.         free( ip_netif );
  173.         return ERROR_CODE;
  174.     }
  175.     ip_netif->device_id = device_id;
  176.     ip_netif->service = netif;
  177.     ip_netif->state = NETIF_STOPPED;
  178.     if( ERROR_OCCURRED( ip_netif_initialize( ip_netif ))){
  179.         ip_routes_destroy( & ip_netif->routes );
  180.         free( ip_netif );
  181.         return ERROR_CODE;
  182.     }
  183.     if( ip_netif->arp ) ++ ip_netif->arp->usage;
  184.     // print the settings
  185.     printf( "New device registered:\n\tid\t= %d\n\tphone\t= %d\n\tIPV\t= %d\n", ip_netif->device_id, ip_netif->phone, ip_netif->ipv );
  186.     printf( "\tconfiguration\t= %s\n", ip_netif->dhcp ? "dhcp" : "static" );
  187.     // TODO ipv6 addresses
  188.     data = ( char * ) malloc( INET_ADDRSTRLEN );
  189.     if( data ){
  190.         for( index = 0; index < ip_routes_count( & ip_netif->routes ); ++ index ){
  191.             route = ip_routes_get_index( & ip_netif->routes, index );
  192.             if( route ){
  193.                 printf( "\tRouting %d:\n", index );
  194.                 inet_ntop( AF_INET, ( uint8_t * ) & route->address.s_addr, data, INET_ADDRSTRLEN );
  195.                 printf( "\t\taddress\t= %s\n", data );
  196.                 inet_ntop( AF_INET, ( uint8_t * ) & route->netmask.s_addr, data, INET_ADDRSTRLEN );
  197.                 printf( "\t\tnetmask\t= %s\n", data );
  198.                 inet_ntop( AF_INET, ( uint8_t * ) & route->gateway.s_addr, data, INET_ADDRSTRLEN );
  199.                 printf( "\t\tgateway\t= %s\n", data );
  200.             }
  201.         }
  202.         inet_ntop( AF_INET, ( uint8_t * ) & ip_netif->broadcast.s_addr, data, INET_ADDRSTRLEN );
  203.         printf( "\tbroadcast\t= %s\n", data );
  204.         inet_ntop( AF_INET, ( uint8_t * ) & ip_netif->dns1, data, INET_ADDRSTRLEN );
  205.         printf( "\tdns1\t= %s\n", data );
  206.         inet_ntop( AF_INET, ( uint8_t * ) & ip_netif->dns2, data, INET_ADDRSTRLEN );
  207.         printf( "\tdns2\t= %s\n", data );
  208.         free( data );
  209.     }
  210.     return EOK;
  211. }
  212.  
  213. int ip_netif_initialize( ip_netif_ref ip_netif ){
  214.     ERROR_DECLARE;
  215.  
  216.     measured_string_t   names[ 9 ] = {{ "IPV", 3 }, { "IP_CONFIG", 9 }, { "IP_ADDR", 7 }, { "NETMASK", 7 }, { "GATEWAY", 7 }, { "BROADCAST", 9 }, { "DNS1", 4 }, { "DNS2", 4 }, { "ARP", 3 }};
  217.     measured_string_ref configuration;
  218.     size_t              count = sizeof( names ) / sizeof( measured_string_t );
  219.     char *              data;
  220.     int                 index;
  221.     ip_route_ref        route;
  222.     in_addr_t           gateway;
  223.  
  224.     configuration = & names[ 0 ];
  225.     // get configuration
  226.     ERROR_PROPAGATE( net_get_device_conf_req( ip_globals.net_phone, ip_netif->device_id, & configuration, count, & data ));
  227.     if( configuration ){
  228.         if( configuration[ 0 ].value ){
  229.             ip_netif->ipv = strtol( configuration[ 0 ].value, NULL, 0 );
  230.         }else{
  231.             ip_netif->ipv = DEFAULT_IPV;
  232.         }
  233.         ip_netif->dhcp = ! str_lcmp( configuration[ 1 ].value, "dhcp", configuration[ 1 ].length );
  234.         if( ip_netif->dhcp ){
  235.             // TODO dhcp
  236.             net_free_settings( configuration, data );
  237.             return ENOTSUP;
  238.         }else if( ip_netif->ipv == 4 ){
  239.             route = ( ip_route_ref ) malloc( sizeof( ip_route_t ));
  240.             if( ! route ){
  241.                 net_free_settings( configuration, data );
  242.                 return ENOMEM;
  243.             }
  244.             route->address.s_addr = 0;
  245.             route->netmask.s_addr = 0;
  246.             route->gateway.s_addr = 0;
  247.             route->netif = ip_netif;
  248.             index = ip_routes_add( & ip_netif->routes, route );
  249.             if( index < 0 ){
  250.                 net_free_settings( configuration, data );
  251.                 free( route );
  252.                 return index;
  253.             }
  254.             if( ERROR_OCCURRED( inet_pton( AF_INET, configuration[ 2 ].value, ( uint8_t * ) & route->address.s_addr ))
  255.             || ERROR_OCCURRED( inet_pton( AF_INET, configuration[ 3 ].value, ( uint8_t * ) & route->netmask.s_addr ))
  256.             || ( inet_pton( AF_INET, configuration[ 4 ].value, ( uint8_t * ) & gateway.s_addr ) == EINVAL )
  257.             || ( inet_pton( AF_INET, configuration[ 5 ].value, ( uint8_t * ) & ip_netif->broadcast.s_addr ) == EINVAL )
  258.             || ( inet_pton( AF_INET, configuration[ 6 ].value, ( uint8_t * ) & ip_netif->dns1 ) == EINVAL )
  259.             || ( inet_pton( AF_INET, configuration[ 7 ].value, ( uint8_t * ) & ip_netif->dns2 ) == EINVAL )){
  260.                 net_free_settings( configuration, data );
  261.                 return EINVAL;
  262.             }
  263.         }else{
  264.             // TODO ipv6 in separate module
  265.             net_free_settings( configuration, data );
  266.             return ENOTSUP;
  267.         }
  268.         if( configuration[ 8 ].value ){
  269.             ip_netif->arp = get_running_module( & ip_globals.modules, configuration[ 8 ].value );
  270.             if( ! ip_netif->arp ){
  271.                 printf( "Failed to start the arp %s\n", configuration[ 8 ].value );
  272.                 net_free_settings( configuration, data );
  273.                 return EINVAL;
  274.             }
  275.         }else{
  276.             ip_netif->arp = NULL;
  277.         }
  278.         net_free_settings( configuration, data );
  279.     }
  280.     ip_netif->phone = bind_service( ip_netif->service, ip_netif->device_id, SERVICE_IP, 0, ip_globals.client_connection );
  281.     if( ip_netif->phone < 0 ){
  282.         printf( "Failed to contact the nil service %d\n", ip_netif->service );
  283.         return ip_netif->phone;
  284.     }
  285.     // MUST BE AFTER the bind_service up there!
  286.     if( ip_netif->arp ){
  287.         configuration[ 0 ].value = ( char * ) & route->address.s_addr;
  288.         configuration[ 0 ].length = CONVERT_SIZE( in_addr_t, char, 1 );
  289.         ERROR_PROPAGATE( arp_device_req( ip_netif->arp->phone, ip_netif->device_id, SERVICE_IP, ip_netif->service, & configuration[ 0 ] ));
  290.     }
  291.     // get packet dimensions
  292.     ERROR_PROPAGATE( nil_packet_size_req( ip_netif->phone, ip_netif->device_id, & ip_netif->addr_len, & ip_netif->prefix, & ip_netif->content, & ip_netif->suffix ));
  293.     if( ip_netif->content < IP_MIN_CONTENT ){
  294.         printf( "Maximum transmission unit %d bytes is too small, at least %d bytes are needed\n", ip_netif->content, IP_MIN_CONTENT );
  295.         ip_netif->content = IP_MIN_CONTENT;
  296.     }
  297.     index = ip_netifs_add( & ip_globals.netifs, ip_netif->device_id, ip_netif );
  298.     if( index < 0 ) return index;
  299.     if( gateway.s_addr ){
  300.         // the default gateway
  301.         ip_globals.gateway.address.s_addr = 0;
  302.         ip_globals.gateway.netmask.s_addr = 0;
  303.         ip_globals.gateway.gateway.s_addr = gateway.s_addr;
  304.         ip_globals.gateway.netif = ip_netif;
  305.     }
  306.     return EOK;
  307. }
  308.  
  309. int ip_device_state_msg( int il_phone, device_id_t device_id, device_state_t state ){
  310.     ERROR_DECLARE;
  311.  
  312. /*  measured_string_t   address;
  313.     measured_string_ref translation;
  314.     char *              data;
  315. */
  316.     packet_t        packet;
  317.     in_addr_t       destination;
  318.  
  319.     ip_netif_ref    netif;
  320.  
  321.     netif = ip_netifs_find( & ip_globals.netifs, device_id );
  322.     if( ! netif ) return ENOENT;
  323.     netif->state = state;
  324.     // TODO state
  325.     printf( "ip - device %d changed state to %d\n\n", device_id, state );
  326.     if( netif->arp ){
  327. /*      address.value = ( char * ) & ip_globals.gateway.gateway.s_addr;
  328.         address.length = CONVERT_SIZE( ip_globals.gateway.gateway.s_addr, char, 1 );
  329.         if( ERROR_OCCURRED( arp_translate_req( netif->arp->phone, netif->device_id, SERVICE_IP, & address, & translation, & data ))){
  330.             ERROR_PROPAGATE( arp_translate_req( netif->arp->phone, netif->device_id, SERVICE_IP, & address, & translation, & data ));
  331.         }
  332.         printf( "\tgateway translated to\t= %X:%X:%X:%X:%X:%X\n", data[ 0 ], data[ 1 ], data[ 2 ], data[ 3 ], data[ 4 ], data[ 5 ] );
  333.         free( translation );
  334.         free( data );
  335.         address.value = ( char * ) & ip_globals.gateway.gateway.s_addr;
  336.         address.length = CONVERT_SIZE( ip_globals.gateway.gateway.s_addr, char, 1 );
  337.         if( ERROR_OCCURRED( arp_translate_req( netif->arp->phone, netif->device_id, SERVICE_IP, & address, & translation, & data ))){
  338.             sleep( 2 );
  339.             ERROR_PROPAGATE( arp_translate_req( netif->arp->phone, netif->device_id, SERVICE_IP, & address, & translation, & data ));
  340.         }
  341.         printf( "\tgateway translated to\t= %X:%X:%X:%X:%X:%X\n", data[ 0 ], data[ 1 ], data[ 2 ], data[ 3 ], data[ 4 ], data[ 5 ] );
  342.         free( translation );
  343.         free( data );
  344. */      printf( "IP - testing to send packet:\n" );
  345.         ERROR_PROPAGATE( inet_pton( AF_INET, "90.182.101.18", ( uint8_t * ) & destination.s_addr ));
  346.         packet = packet_get_4( ip_globals.net_phone, 30, netif->addr_len, netif->prefix + sizeof( ip_header_t ), netif->suffix );
  347.         if( ! packet ) return ENOMEM;
  348.         pq_release( ip_globals.net_phone, packet_get_id( packet ));
  349.         packet = packet_get_4( ip_globals.net_phone, 30, netif->addr_len, netif->prefix + sizeof( ip_header_t ), netif->suffix );
  350.         if( ! packet ) return ENOMEM;
  351.         pq_release( ip_globals.net_phone, packet_get_id( packet ));
  352.         packet = packet_get_4( ip_globals.net_phone, 30, netif->addr_len, netif->prefix + sizeof( ip_header_t ), netif->suffix );
  353.         if( ! packet ) return ENOMEM;
  354.         pq_release( ip_globals.net_phone, packet_get_id( packet ));
  355.         packet = packet_get_4( ip_globals.net_phone, 1500, netif->addr_len, netif->prefix + sizeof( ip_header_t ), netif->suffix );
  356.         if( ! packet ) return ENOMEM;
  357.         // try this long version
  358. //      if( ERROR_OCCURRED( packet_copy_data( packet, "Hi, this is IP, wery long version 1, wery long version 2, wery long version 3, wery long version 4, wery long version 5, wery long version 6, wery long version 7, wery long version 8, wery long version 9, wery long version 10, wery long version 11, wery long version 12, wery long version 13, wery long version 14, wery long version 15, wery long version 16, wery long version 17, wery long version 18, wery long version 19, wery long version 20, wery long version 21, wery long version 22, wery long version 23, wery long version 24, wery long version 25, wery long version 26, wery long version 27, wery long version 28, wery long version 29, wery long version 30Hi, this is IP, wery long version 1, wery long version 2, wery long version 3, wery long version 4, wery long version 5, wery long version 6, wery long version 7, wery long version 8, wery long version 9, wery long version 10, wery long version 11, wery long version 12, wery long version 13, wery long version 14, wery long version 15, wery long version 16, wery long version 17, wery long version 18, wery long version 19, wery long version 20, wery long version 21, wery long version 22, wery long version 23, wery long version 24, wery long version 25, wery long version 26, wery long version 27, wery long version 28, wery long version 29, wery long version 30", 1330 ))
  359.         if( ERROR_OCCURRED( packet_copy_data( packet, "Hi, this is IP", 14 ))
  360.         || ERROR_OCCURRED( packet_set_addr( packet, NULL, ( uint8_t * ) & destination.s_addr, 4 ))
  361.         || ERROR_OCCURRED( ip_client_prepare_packet( packet, 0, 0, 0, 0, 0 ))){
  362.             pq_release( ip_globals.net_phone, packet_get_id( packet ));
  363.         }
  364.         ERROR_CODE = ip_send_msg( 0, 0, packet, SERVICE_IP );
  365.         printf( "send returned %d\n", ERROR_CODE );
  366.     }
  367.     return EOK;
  368. }
  369.  
  370. int ip_connect_module( services_t service ){
  371.     return EOK;
  372. }
  373.  
  374. int ip_bind_service( services_t service, int protocol, services_t me, async_client_conn_t receiver, tl_received_msg_t tl_received_msg ){
  375.     return ip_register( protocol, me, 0, tl_received_msg );
  376. }
  377.  
  378. int ip_register( int protocol, services_t service, int phone, tl_received_msg_t tl_received_msg ){
  379.     ip_proto_ref    proto;
  380.     int             index;
  381.  
  382.     if( !( protocol && service && (( phone > 0 ) || ( tl_received_msg )))) return EINVAL;
  383.     proto = ( ip_proto_ref ) malloc( sizeof( ip_protos_t ));
  384.     if( ! proto ) return ENOMEM;
  385.     proto->protocol = protocol;
  386.     proto->service = service;
  387.     proto->phone = phone;
  388.     proto->tl_received_msg = tl_received_msg;
  389.     index = ip_protos_add( & ip_globals.protos, proto->protocol, proto );
  390.     if( index < 0 ){
  391.         free( proto );
  392.         return index;
  393.     }
  394.     printf( "New protocol registered:\n\tprotocol\t= %d\n\tphone\t= %d\n", proto->protocol, proto->phone );
  395.     return EOK;
  396. }
  397.  
  398. int ip_send_msg( int il_phone, device_id_t device_id, packet_t packet, services_t sender ){
  399.     ERROR_DECLARE;
  400.  
  401.     int                 length;
  402.     ip_netif_ref        netif;
  403.     ip_route_ref        route;
  404.     in_addr_t           dest;
  405.     in_addr_t *         src;
  406.  
  407.     // addresses in the host byte order
  408.     // should be the next hop address or the target destination address
  409.     length = packet_get_addr( packet, NULL, ( void * )( & dest.s_addr ));
  410.     if( length < 0 ){
  411.         pq_release( ip_globals.net_phone, packet_get_id( packet ));
  412.         return length;
  413.     }
  414.     // TODO IPv6
  415.     if( length != IP_ADDR ){
  416.         pq_release( ip_globals.net_phone, packet_get_id( packet ));
  417.         return EINVAL;
  418.     }
  419. //  rwlock_read_lock( & ip_globals.devices_lock );
  420.     // device specified?
  421. //  dest.s_addr = ntohl( dest.s_addr );
  422.     if( device_id ){
  423.         netif = ip_netifs_find( & ip_globals.netifs, device_id );
  424.         route = ip_netif_find_route( netif, dest );
  425.     }else{
  426.         // TODO IPv6
  427.         route = ip_find_route( dest );
  428.         netif = route ? route->netif : NULL;
  429.     }
  430.     if( !( netif && route )){
  431. //      rwlock_read_unlock( & ip_globals.devices_lock );
  432.         pq_release( ip_globals.net_phone, packet_get_id( packet ));
  433.         return ENOENT;
  434.     }
  435.     // to me?
  436.     if( route->address.s_addr == dest.s_addr ){
  437.         // TODO loopback deliver
  438.     }
  439.  
  440.     src = ip_netif_addr( netif );
  441.     if( ! src ){
  442.         pq_release( ip_globals.net_phone, packet_get_id( packet ));
  443.         return ENOENT;
  444.     }
  445.     if( ERROR_OCCURRED( ip_send_route( packet, netif, route, src, dest ))){
  446.         pq_release( ip_globals.net_phone, packet_get_id( packet ));
  447.     }
  448.     return ERROR_CODE;
  449. }
  450.  
  451. in_addr_t * ip_netif_addr( ip_netif_ref netif ){
  452.     ip_route_ref    route;
  453.  
  454.     route = ip_routes_get_index( & netif->routes, 0 );
  455.     return route ? & route->address : NULL;
  456. }
  457.  
  458. int ip_send_route( packet_t packet, ip_netif_ref netif, ip_route_ref route, in_addr_t * src, in_addr_t dest ){
  459.     ERROR_DECLARE;
  460.  
  461.     packet_t            next;
  462.     packet_t            tmp;
  463.     measured_string_t   destination;
  464.     measured_string_ref translation;
  465.     char *              data;
  466.  
  467.     if( route->gateway.s_addr ){
  468.         dest.s_addr = route->gateway.s_addr;
  469.     }
  470.     // get destination hardware address
  471.     if( netif->arp ){
  472.         destination.value = ( char * ) & dest.s_addr;
  473.         destination.length = CONVERT_SIZE( dest.s_addr, char, 1 );
  474.         if( ERROR_OCCURRED( arp_translate_req( netif->arp->phone, netif->device_id, SERVICE_IP, & destination, & translation, & data ))){
  475.             usleep( 200000 );
  476.             ERROR_PROPAGATE( arp_translate_req( netif->arp->phone, netif->device_id, SERVICE_IP, & destination, & translation, & data ));
  477.         }
  478.         // TODO unreachable
  479.         if( ! translation ) return EINVAL;
  480.         if( ! translation->value ){
  481.             // TODO unreachable
  482.             free( translation );
  483.             free( data );
  484.             return EINVAL;
  485.         }
  486.     }else translation = NULL;
  487.     // process packet queue
  488.     next = packet;
  489.     do{
  490.         if( ERROR_OCCURRED( ip_prepare_packet( src, next, translation ))){
  491.             // release invalid packet
  492.             tmp = pq_detach( next );
  493.             if( next == packet ) packet = tmp;
  494.             pq_release( ip_globals.net_phone, packet_get_id( next ));
  495.             next = tmp;
  496.         }else{
  497.             next = pq_next( next );
  498.         }
  499.     }while( next );
  500.     if( translation ){
  501.         free( translation );
  502.         free( data );
  503.     }
  504.     // send packet queue
  505.     if( packet ){
  506.         packet = ip_split_packet( packet, netif->prefix, netif->content, netif->suffix, netif->addr_len );
  507.         if( packet ){
  508.             nil_send_msg( netif->phone, netif->device_id, packet, SERVICE_IP );
  509.         }
  510.     }
  511. //  rwlock_read_unlock( & ip_globals.netifs_lock );
  512.     return EOK;
  513. }
  514.  
  515. int ip_prepare_packet( in_addr_t * source, packet_t packet, measured_string_ref destination ){
  516.     ERROR_DECLARE;
  517.  
  518.     int                 length;
  519.     ip_header_ref       header;
  520.  
  521.     length = packet_get_data_length( packet );
  522.     if(( length < sizeof( ip_header_t )) || ( length > IP_MAX_CONTENT )) return EINVAL;
  523.     header = ( ip_header_ref ) packet_get_data( packet );
  524.     if( destination ){
  525.         ERROR_PROPAGATE( packet_set_addr( packet, NULL, ( uint8_t * ) destination->value, CONVERT_SIZE( char, uint8_t, destination->length )));
  526.     }
  527.     header->version = 4;
  528.     header->total_length = htons( length );
  529.     header->fragment_offset = 0;
  530.     if( source ) header->source_address = source->s_addr;//htonl( source.s_addr );
  531.     ++ ip_globals.packet_counter;
  532.     header->identification = htons( ip_globals.packet_counter );
  533.     header->header_checksum = 0;
  534.     // unnecessary for all protocols
  535.     header->header_checksum = IP_HEADER_CHECKSUM( header );
  536.     return EOK;
  537. }
  538.  
  539. int ip_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
  540.     ERROR_DECLARE;
  541.  
  542.     packet_t    packet;
  543.  
  544.     * answer_count = 0;
  545.     switch( IPC_GET_METHOD( * call )){
  546.         case IPC_M_PHONE_HUNGUP:
  547.             return EOK;
  548.         case NET_IL_DEVICE:
  549.             return ip_device_req( 0, IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ));
  550.         case IPC_M_CONNECT_TO_ME:
  551.             return ip_register( IL_GET_PROTO( call ), IL_GET_SERVICE( call ), IPC_GET_PHONE( call ), NULL );
  552.         case NET_IL_SEND:
  553.             ERROR_PROPAGATE( packet_translate( ip_globals.net_phone, & packet, IPC_GET_PACKET( call )));
  554.             return ip_send_msg( 0, IPC_GET_DEVICE( call ), packet, 0 );
  555.         case NET_IL_DEVICE_STATE:
  556.         case NET_NIL_DEVICE_STATE:
  557.             return ip_device_state_msg( 0, IPC_GET_DEVICE( call ), IPC_GET_STATE( call ));
  558.         case NET_IL_RECEIVED:
  559.         case NET_NIL_RECEIVED:
  560.             ERROR_PROPAGATE( packet_translate( ip_globals.net_phone, & packet, IPC_GET_PACKET( call )));
  561.             return ip_received_msg( IPC_GET_DEVICE( call ), packet );
  562.         case NET_IP_ADD_ROUTE:
  563.             return ip_add_route_req( 0, IPC_GET_DEVICE( call ), IP_GET_ADDRESS( call ), IP_GET_NETMASK( call ), IP_GET_GATEWAY( call ));
  564.         case NET_IP_SET_GATEWAY:
  565.             return ip_set_gateway_req( 0, IPC_GET_DEVICE( call ), IP_GET_GATEWAY( call ));
  566.         case NET_IL_PACKET_SPACE:
  567.             ERROR_PROPAGATE( ip_packet_size_req( 0, IPC_GET_DEVICE( call ), IPC_SET_ADDR( answer ), IPC_SET_PREFIX( answer ), IPC_SET_CONTENT( answer ), IPC_SET_SUFFIX( answer )));
  568.             * answer_count = 3;
  569.             return EOK;
  570.     }
  571.     return ENOTSUP;
  572. }
  573.  
  574. int ip_packet_size_req( int ip_phone, device_id_t device_id, size_t * addr_len, size_t * prefix, size_t * content, size_t * suffix ){
  575.     ip_netif_ref    netif;
  576.  
  577.     if( !( addr_len && prefix && content && suffix )) return EBADMEM;
  578. //  rwlock_read_lock( & ip_globals.netifs_lock );
  579.     netif = ip_netifs_find( & ip_globals.netifs, device_id );
  580.     if( ! netif ){
  581. //      rwlock_read_unlock( & ip_globals.netifs_lock );
  582.         return ENOENT;
  583.     }
  584.     * content = IP_MAX_CONTENT - IP_PREFIX;
  585.     * addr_len = ( netif->addr_len > IP_ADDR ) ? netif->addr_len : IP_ADDR;
  586.     * prefix = netif->prefix + IP_PREFIX;
  587.     * suffix = netif->suffix + IP_SUFFIX;
  588. //  rwlock_read_unlock( & ip_globals.netifs_lock );
  589.     return EOK;
  590. }
  591.  
  592. int ip_add_route_req( int ip_phone, device_id_t device_id, in_addr_t address, in_addr_t netmask, in_addr_t gateway ){
  593.     ip_route_ref    route;
  594.     ip_netif_ref    netif;
  595.     int             index;
  596.  
  597.     netif = ip_netifs_find( & ip_globals.netifs, device_id );
  598.     if( ! netif ) return ENOENT;
  599.     route = ( ip_route_ref ) malloc( sizeof( ip_route_t ));
  600.     if( ! route ) return ENOMEM;
  601.     route->address.s_addr = address.s_addr;
  602.     route->netmask.s_addr = netmask.s_addr;
  603.     route->gateway.s_addr = gateway.s_addr;
  604.     route->netif = netif;
  605.     index = ip_routes_add( & netif->routes, route );
  606.     if( index < 0 ) free( route );
  607.     return index;
  608. }
  609.  
  610. ip_route_ref ip_find_route( in_addr_t destination ){
  611.     int             index;
  612.     ip_route_ref    route;
  613.     ip_netif_ref    netif;
  614.  
  615.     // start with the last netif - the newest one
  616.     index = ip_netifs_count( & ip_globals.netifs ) - 1;
  617.     while( index >= 0 ){
  618.         netif = ip_netifs_get_index( & ip_globals.netifs, index );
  619.         if( netif && ( netif->state == NETIF_ACTIVE )){
  620.             route = ip_netif_find_route( netif, destination );
  621.             if( route ) return route;
  622.         }
  623.         -- index;
  624.     }
  625.     return & ip_globals.gateway;
  626. }
  627.  
  628. ip_route_ref ip_netif_find_route( ip_netif_ref netif, in_addr_t destination ){
  629.     int             index;
  630.     ip_route_ref    route;
  631.  
  632.     if( netif ){
  633.         // start with the first one - the direct route
  634.         for( index = 0; index < ip_routes_count( & netif->routes ); ++ index ){
  635.             route = ip_routes_get_index( & netif->routes, index );
  636.             if( route && (( route->address.s_addr & route->netmask.s_addr ) == ( destination.s_addr & route->netmask.s_addr ))){
  637.                 return route;
  638.             }
  639.         }
  640.     }
  641.     return NULL;
  642. }
  643.  
  644. int ip_set_gateway_req( int ip_phone, device_id_t device_id, in_addr_t gateway ){
  645.     ip_netif_ref    netif;
  646.  
  647.     netif = ip_netifs_find( & ip_globals.netifs, device_id );
  648.     if( ! netif ) return ENOENT;
  649.     ip_globals.gateway.address.s_addr = 0;
  650.     ip_globals.gateway.netmask.s_addr = 0;
  651.     ip_globals.gateway.gateway.s_addr = gateway.s_addr;
  652.     ip_globals.gateway.netif = netif;
  653.     return EOK;
  654. }
  655.  
  656. packet_t ip_split_packet( packet_t packet, size_t prefix, size_t content, size_t suffix, size_t addr_len ){
  657.     size_t          length;
  658.     packet_t        next;
  659.     packet_t        new_packet;
  660.  
  661.     next = packet;
  662.     // check all packets
  663.     while( next ){
  664.         length = packet_get_data_length( next );
  665.         // too long?
  666.         if( length > content ){
  667.             if( ip_fragment_packet( next, content, prefix, suffix, addr_len ) != EOK ){
  668.                 new_packet = pq_detach( next );
  669.                 if( next == packet ){
  670.                     packet = new_packet;
  671.                 }
  672.                 pq_release( ip_globals.net_phone, packet_get_id( next ));
  673.                 next = new_packet;
  674.                 continue;
  675.             }
  676.         }
  677.         next = pq_next( next );
  678.     }
  679.     return packet;
  680. }
  681.  
  682. int ip_fragment_packet( packet_t packet, size_t length, size_t prefix, size_t suffix, size_t addr_len ){
  683.     ERROR_DECLARE;
  684.  
  685.     packet_t        new_packet;
  686.     ip_header_ref   header;
  687.     ip_header_ref   middle_header;
  688.     ip_header_ref   last_header;
  689.     uint8_t *       src;
  690.     uint8_t *       dest;
  691.     int             address_length;
  692.  
  693.     address_length = packet_get_addr( packet, & src, & dest );
  694.     if( address_length <= 0 ) return EINVAL;
  695.     if( packet_get_data_length( packet ) <= sizeof( ip_header_t )) return ENOMEM;
  696.     // get header
  697.     header = ( ip_header_ref ) packet_get_data( packet );
  698.     if( ! header ) return EINVAL;
  699.     // fragmentation forbidden?
  700.     if( header->flags & IPFLAG_DONT_FRAGMENT ){
  701.         // TODO fragmentation necessary ICMP
  702.         return EPERM;
  703.     }
  704.     // create the last fragment
  705.     new_packet = packet_get_4( ip_globals.net_phone, prefix, length, suffix, (( address_length > addr_len ) ? address_length : addr_len ));
  706.     if( ! new_packet ) return ENOMEM;
  707.     last_header = ip_create_last_header( new_packet, header );
  708.     if( ! last_header ){
  709.         pq_release( ip_globals.net_phone, packet_get_id( new_packet ));
  710.         return ENOMEM;
  711.     }
  712.     // biggest multiple of 8 lower than content
  713.     // TODO even fragmentation?
  714.     length = length & ( ~ 0x7 );// ( content / 8 ) * 8
  715.     if( ERROR_OCCURRED( ip_fragment_packet_data( packet, new_packet, header, last_header, (( IP_TOTAL_LENGTH( header ) - length ) % ( length - IP_HEADER_LENGTH( last_header ))), src, dest, address_length ))){
  716.         pq_release( ip_globals.net_phone, packet_get_id( new_packet ));
  717.         return ERROR_CODE;
  718.     }
  719.     // mark the first as fragmented
  720.     header->flags |= IPFLAG_MORE_FRAGMENTS;
  721.     // create middle framgents
  722.     while( IP_TOTAL_LENGTH( header ) > length ){
  723.         new_packet = packet_get_4( ip_globals.net_phone, prefix, length, suffix, (( address_length >= addr_len ) ? address_length : addr_len ));
  724.         if( ! new_packet ) return ENOMEM;
  725.         middle_header = ip_create_middle_header( new_packet, last_header );
  726.         if( ! middle_header ){
  727.             pq_release( ip_globals.net_phone, packet_get_id( new_packet ));
  728.             return ENOMEM;
  729.         }
  730.         if( ERROR_OCCURRED( ip_fragment_packet_data( packet, new_packet, header, middle_header, length - IP_HEADER_LENGTH( middle_header ), src, dest, address_length ))){
  731.             pq_release( ip_globals.net_phone, packet_get_id( new_packet ));
  732.             return ERROR_CODE;
  733.         }
  734.     }
  735.     // finish the first fragment
  736.     header->header_checksum = IP_HEADER_CHECKSUM( header );
  737.     printf( "ok\n" );
  738.     return EOK;
  739. }
  740.  
  741. int ip_fragment_packet_data( packet_t packet, packet_t new_packet, ip_header_ref header, ip_header_ref new_header, size_t length, void * src, void * dest, size_t address_length ){
  742.     ERROR_DECLARE;
  743.  
  744.     void *          data;
  745.  
  746.     data = packet_suffix( new_packet, length );
  747.     if( ! data ) return ENOMEM;
  748.     memcpy( data, (( void * ) header ) + IP_TOTAL_LENGTH( header ) - length, length );
  749.     ERROR_PROPAGATE( packet_trim( packet, 0, length ));
  750.     header->total_length = htons( IP_TOTAL_LENGTH( header ) - length );
  751.     new_header->total_length = htons( IP_HEADER_LENGTH( new_header ) + length );
  752.     new_header->fragment_offset = header->fragment_offset + IP_HEADER_DATA_LENGTH( header ) / 8;
  753.     new_header->header_checksum = IP_HEADER_CHECKSUM( new_header );
  754.     ERROR_PROPAGATE( packet_set_addr( new_packet, src, dest, address_length ));
  755.     return pq_insert_after( packet, new_packet );
  756. }
  757.  
  758. ip_header_ref ip_create_middle_header( packet_t packet, ip_header_ref last ){
  759.     ip_header_ref   middle;
  760.  
  761.     middle = ( ip_header_ref ) packet_suffix( packet, IP_HEADER_LENGTH( last ));
  762.     if( ! middle ) return NULL;
  763.     memcpy( middle, last, IP_HEADER_LENGTH( last ));
  764.     middle->flags |= IPFLAG_MORE_FRAGMENTS;
  765.     return middle;
  766. }
  767.  
  768. ip_header_ref ip_create_last_header( packet_t packet, ip_header_ref first ){
  769.     ip_header_ref   last;
  770.     ip_option_ref   option;
  771.     size_t          next;
  772.     size_t          length;
  773.  
  774.     // allocate as much as originally
  775.     last = ( ip_header_ref ) packet_suffix( packet, IP_HEADER_LENGTH( first ));
  776.     if( ! last ) return NULL;
  777.     // copy first itself
  778.     memcpy( last, first, sizeof( ip_header_t ));
  779.     length = sizeof( ip_header_t );
  780.     next = sizeof( ip_header_t );
  781.     // process all ip options
  782.     while( next < first->ihl ){
  783.         option = ( ip_option_ref ) ((( void * ) first ) + next );
  784.         // skip end or noop
  785.         if(( option->type == IPOPT_END ) || ( option->type == IPOPT_NOOP )){
  786.             ++ next;
  787.         }else{
  788.             // copy if said so or skip
  789.             if( IPOPT_COPIED( option->type )){
  790.                 memcpy((( void * ) last ) + length, (( void * ) first ) + next, option->length );
  791.                 length += option->length;
  792.             }
  793.             // next option
  794.             next += option->length;
  795.         }
  796.     }
  797.     // align 4 byte boundary
  798.     if( length % 4 ){
  799.         bzero((( void * ) last ) + length, 4 - ( length % 4 ));
  800.         last->ihl = length / 4 + 1;
  801.     }else{
  802.         last->ihl = length / 4;
  803.     }
  804.     // trim the unused space
  805.     if( packet_trim( packet, 0, IP_HEADER_LENGTH( first ) - IP_HEADER_LENGTH( last )) != EOK ) return NULL;
  806.     return last;
  807. }
  808.  
  809. int ip_received_msg( device_id_t device_id, packet_t packet ){
  810.     packet_t        next;
  811.  
  812.     do{
  813.         next = pq_detach( packet );
  814.         if( ip_process_packet( device_id, packet ) != EOK ){
  815.             pq_release( ip_globals.net_phone, packet_get_id( packet ));
  816.         }
  817.         packet = next;
  818.     }while( packet );
  819.     return EOK;
  820. }
  821.  
  822. int ip_process_packet( device_id_t device_id, packet_t packet ){
  823.     ERROR_DECLARE;
  824.  
  825.     ip_header_ref   header;
  826.     in_addr_t       dest;
  827.     ip_route_ref    route;
  828.  
  829.     header = ( ip_header_ref ) packet_get_data( packet );
  830.     if( ! header ) return ENOMEM;
  831.     // checksum
  832.     if(( header->header_checksum ) && ( IP_HEADER_CHECKSUM( header ))){
  833.         // TODO checksum error ICMP?
  834.         return EINVAL;
  835.     }
  836.     // TODO ttl oxceeded ICMP?
  837.     if( !( -- header->ttl )) return EINVAL;
  838.     // process ipopt and get destination
  839.     dest = ip_get_destination( header );
  840.     ERROR_PROPAGATE( packet_set_addr( packet, NULL, ( uint8_t * ) & dest.s_addr, IP_ADDR ));
  841.     route = ip_find_route( dest );
  842.     // TODO unreachable ICMP?
  843.     if( ! route ) return ENOENT;
  844.     if( route->address.s_addr == dest.s_addr ){
  845.         // local delivery
  846.         return ip_deliver_local( device_id, packet, header );
  847.     }else{
  848.         return ip_send_route( packet, route->netif, route, NULL, dest );
  849.     }
  850. }
  851.  
  852. int ip_deliver_local( device_id_t device_id, packet_t packet, ip_header_ref header ){
  853.     ERROR_DECLARE;
  854.  
  855.     ip_proto_ref    proto;
  856.  
  857.     if(( header->flags & IPFLAG_MORE_FRAGMENTS ) || header->fragment_offset ){
  858.         // TODO fragmented
  859.         return ENOTSUP;
  860.     }else{
  861.         proto = ip_protos_find( & ip_globals.protos, header->protocol );
  862.         if( ! proto ) return ENOENT;
  863.         ERROR_PROPAGATE( packet_set_addr( packet, ( uint8_t * ) & header->source_address, ( uint8_t * ) & header->destination_address, IP_ADDR ));
  864.         if( proto->tl_received_msg ){
  865.             return proto->tl_received_msg( device_id, packet, SERVICE_IP );
  866.         }else{
  867.             return tl_received_msg( proto->phone, device_id, packet, proto->service );
  868.         }
  869.     }
  870. }
  871.  
  872. in_addr_t ip_get_destination( ip_header_ref header ){
  873.     in_addr_t   destination;
  874.  
  875.     // TODO search set ipopt route?
  876.     destination.s_addr = header->destination_address; //ntohl( header->destination_address );
  877.     return destination;
  878. }
  879.  
  880. /** @}
  881.  */
  882.