source: mainline/uspace/srv/net/include/protocol_map.h@ 1a0fb3f8

/*
 * Copyright (c) 2009 Lukas Mejdrech
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup net_nil
 *  @{
 */

/** @file
 *  Internetwork layer services - network interface layer service type translation.
 */

#ifndef __NET_PROTOCOL_MAP_H__
#define __NET_PROTOCOL_MAP_H__

#include <ipc/services.h>

#include "ethernet_lsap.h"
#include "ethernet_protocols.h"
#include "hardware.h"

/** Maps the internetwork layer service to the network interface layer type.
 *  @param[in] nil Network interface layer service.
 *  @param[in] il Internetwork layer service.
 *  @returns Network interface layer type of the internetworking layer service.
 *  @returns 0 if mapping is not found.
 */
static inline eth_type_t protocol_map( services_t nil, services_t il ){
        switch( nil ){
                case SERVICE_ETHERNET:
                case SERVICE_DP8390:
                        switch( il ){
                                case SERVICE_IP:
                                        return ETH_P_IP;
                                case SERVICE_ARP:
                                        return ETH_P_ARP;
                                default:
                                        return 0;
                        }
                default:
                        return 0;
        }
}

/** Maps the network interface layer type to the internetwork layer service.
 *  @param[in] nil Network interface layer service.
 *  @param[in] protocol Network interface layer type.
 *  @returns Internetwork layer service of the network interface layer type.
 *  @returns 0 if mapping is not found.
 */
static inline services_t protocol_unmap( services_t nil, int protocol ){
        switch( nil ){
                case SERVICE_ETHERNET:
                case SERVICE_DP8390:
                        switch( protocol ){
                                case ETH_P_IP:
                                        return SERVICE_IP;
                                case ETH_P_ARP:
                                        return SERVICE_ARP;
                                default:
                                        return 0;
                        }
                default:
                        return 0;
        }
}

/** Maps the link service access point identifier to the Ethernet protocol identifier.
 *  @param[in] lsap Link service access point identifier.
 *  @returns Ethernet protocol identifier of the link service access point identifier.
 *  @returns ETH_LSAP_NULL if mapping is not found.
 */
static inline eth_type_t lsap_map( eth_lsap_t lsap ){
        switch( lsap ){
                case ETH_LSAP_IP:
                        return ETH_P_IP;
                case ETH_LSAP_ARP:
                        return ETH_P_ARP;
                default:
                        return ETH_LSAP_NULL;
        }
}

/** Maps the Ethernet protocol identifier to the link service access point identifier.
 *  @param[in] ethertype Ethernet protocol identifier.
 *  @returns Link service access point identifier.
 *  @returns 0 if mapping is not found.
 */
static inline eth_lsap_t lsap_unmap( eth_type_t ethertype ){
        switch( ethertype ){
                case ETH_P_IP:
                        return ETH_LSAP_IP;
                case ETH_P_ARP:
                        return ETH_LSAP_ARP;
                default:
                        return 0;
        }
}

/** Maps the network interface layer services to the hardware types.
 *  @param[in] nil The network interface service.
 *  @returns The hardware type of the network interface service.
 *  @returns 0 if mapping is not found.
 */
static inline hw_type_t hardware_map( services_t nil ){
        switch( nil ){
                case SERVICE_ETHERNET:
                case SERVICE_DP8390:
                        return HW_ETHER;
                default:
                        return 0;
        }
}

#endif

/** @}
 */