/*
 * Copyright (c) 2004, Swedish Institute of Computer Science.
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 * 2. 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. 
 * 3. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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. 
 *
 * This file is part of the Contiki operating system.
 * 
 * Author: Adam Dunkels <adam@sics.se>
 *
 */

/**
 * \file
 * uIP packet forwarding header file.
 * \author Adam Dunkels <adam@sics.se>
 */

/**
 * \addtogroup uipfw
 * @{
 */

#ifndef UIP_FW_H_
#define UIP_FW_H_

#include "net/ip/uip.h"

/**
 * Representation of a uIP network interface.
 */
struct uip_fw_netif {
  struct uip_fw_netif *next;  /**< Pointer to the next interface when
				 linked in a list. */
  uip_ipaddr_t ipaddr;            /**< The IP address of this interface. */
  uip_ipaddr_t netmask;           /**< The netmask of the interface. */
  uint8_t (* output)(void);
                              /**< A pointer to the function that
				 sends a packet. */
};

/**
 * Instantiating macro for a uIP network interface.
 *
 * Example:
 \code
 struct uip_fw_netif slipnetif =
   {UIP_FW_NETIF(192,168,76,1, 255,255,255,0, slip_output)};
 \endcode
 * \param ip1,ip2,ip3,ip4 The IP address of the network interface.
 *
 * \param nm1,nm2,nm3,nm4 The netmask of the network interface.
 *
 * \param outputfunc A pointer to the output function of the network interface.
 *
 * \hideinitializer
 */
#define UIP_FW_NETIF(ip1,ip2,ip3,ip4, nm1,nm2,nm3,nm4, outputfunc) \
        NULL, \
	{ {ip1, ip2, ip3, ip4} }, \
	{ {nm1, nm2, nm3, nm4} }, \
        outputfunc

/**
 * Set the IP address of a network interface.
 *
 * \param netif A pointer to the uip_fw_netif structure for the network interface.
 *
 * \param addr A pointer to an IP address.
 *
 * \hideinitializer
 */
#define uip_fw_setipaddr(netif, addr) \
        do { (netif)->ipaddr[0] = ((uint16_t *)(addr))[0]; \
             (netif)->ipaddr[1] = ((uint16_t *)(addr))[1]; } while(0)
/**
 * Set the netmask of a network interface.
 *
 * \param netif A pointer to the uip_fw_netif structure for the network interface.
 *
 * \param addr A pointer to an IP address representing the netmask.
 *
 * \hideinitializer
 */
#define uip_fw_setnetmask(netif, addr) \
        do { (netif)->netmask[0] = ((uint16_t *)(addr))[0]; \
             (netif)->netmask[1] = ((uint16_t *)(addr))[1]; } while(0)

void uip_fw_init(void);
uint8_t uip_fw_forward(void);
uint8_t uip_fw_output(void);
void uip_fw_register(struct uip_fw_netif *netif);
void uip_fw_default(struct uip_fw_netif *netif);
void uip_fw_periodic(void);


/**
 * A non-error message that indicates that a packet should be
 * processed locally.
 *
 * \hideinitializer
 */
#define UIP_FW_LOCAL     0

/**
 * A non-error message that indicates that something went OK.
 *
 * \hideinitializer
 */
#define UIP_FW_OK        0

/**
 * A non-error message that indicates that a packet was forwarded.
 *
 * \hideinitializer
 */
#define UIP_FW_FORWARDED 1

/**
 * A non-error message that indicates that a zero-length packet
 * transmission was attempted, and that no packet was sent.
 *
 * \hideinitializer
 */
#define UIP_FW_ZEROLEN   2

/**
 * An error message that indicates that a packet that was too large
 * for the outbound network interface was detected.
 *
 * \hideinitializer
 */
#define UIP_FW_TOOLARGE  3

/**
 * An error message that indicates that no suitable interface could be
 * found for an outbound packet.
 *
 * \hideinitializer
 */
#define UIP_FW_NOROUTE   4

/**
 * An error message that indicates that a packet that should be
 * forwarded or output was dropped.
 *
 * \hideinitializer
 */
#define UIP_FW_DROPPED   5


#endif /* UIP_FW_H_ */

/** @} */
