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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 net_nil
  30.  *  @{
  31.  */
  32.  
  33. /** @file
  34.  *  Internetwork layer services - network interface layer service type translation.
  35.  */
  36.  
  37. #ifndef __NET_PROTOCOL_MAP_H__
  38. #define __NET_PROTOCOL_MAP_H__
  39.  
  40. #include <ipc/services.h>
  41.  
  42. #include "ethernet_lsap.h"
  43. #include "ethernet_protocols.h"
  44.  
  45. /** Maps the internetwork layer service to the network interface layer type.
  46.  *  @param nil Network interface layer service. Input parameter.
  47.  *  @param il Internetwork layer service. Input parameter.
  48.  *  @returns Network interface layer type of the internetworking layer service.
  49.  *  @returns 0 if mapping is not found.
  50.  */
  51. static inline int protocol_map( services_t nil, services_t il ){
  52.     switch( nil ){
  53.         case SERVICE_ETHERNET:
  54.             switch( il ){
  55.                 case SERVICE_IP:
  56.                     return ETH_P_IP;
  57.                 case SERVICE_ARP:
  58.                     return ETH_P_ARP;
  59.                 default:
  60.                     return 0;
  61.             }
  62.         default:
  63.             return 0;
  64.     }
  65. }
  66.  
  67. /** Maps the network interface layer type to the internetwork layer service.
  68.  *  @param nil Network interface layer service. Input parameter.
  69.  *  @param protocol Network interface layer type. Input parameter.
  70.  *  @returns Internetwork layer service of the network interface layer type.
  71.  *  @returns 0 if mapping is not found.
  72.  */
  73. static inline services_t protocol_unmap( services_t nil, int protocol ){
  74.     switch( nil ){
  75.         case SERVICE_ETHERNET:
  76.             switch( protocol ){
  77.                 case ETH_P_IP:
  78.                     return SERVICE_IP;
  79.                 case ETH_P_ARP:
  80.                     return SERVICE_ARP;
  81.                 default:
  82.                     return 0;
  83.             }
  84.         default:
  85.             return 0;
  86.     }
  87. }
  88.  
  89. /** Maps the link service access point identifier to the Ethernet protocol identifier.
  90.  *  @param lsap Link service access point identifier. Input parameter.
  91.  *  @returns Ethernet protocol identifier of the link service access point identifier.
  92.  *  @returns ETH_LSAP_NULL if mapping is not found.
  93.  */
  94. static inline int lsap_map( int lsap ){
  95.     switch( lsap ){
  96.         case ETH_LSAP_IP:
  97.             return ETH_P_IP;
  98.         case ETH_LSAP_ARP:
  99.             return ETH_P_ARP;
  100.         default:
  101.             return ETH_LSAP_NULL;
  102.     }
  103. }
  104.  
  105. #endif
  106.  
  107. /** @}
  108.  */
  109.