/*
 * Copyright 2006-2010, Haiku, Inc. All Rights Reserved.
 * Distributed under the terms of the MIT License.
 */
#ifndef IPV4_H
#define IPV4_H


#include <netinet/in.h>

#include <ByteOrder.h>


#define IPV4_VERSION                    4

// fragment flags
#define IP_RESERVED_FLAG                0x8000
#define IP_DONT_FRAGMENT                0x4000
#define IP_MORE_FRAGMENTS               0x2000
#define IP_FRAGMENT_OFFSET_MASK 0x1fff


struct ipv4_header {
#if B_HOST_IS_LENDIAN == 1
        uint8           header_length : 4;      // header length in 32-bit words
        uint8           version : 4;
#else
        uint8           version : 4;
        uint8           header_length : 4;
#endif
        uint8           service_type;
        uint16          total_length;
        uint16          id;
        uint16          fragment_offset;
        uint8           time_to_live;
        uint8           protocol;
        uint16          checksum;
        in_addr_t       source;
        in_addr_t       destination;

        uint16 HeaderLength() const { return header_length << 2; }
        uint16 TotalLength() const { return ntohs(total_length); }
        uint16 FragmentOffset() const { return ntohs(fragment_offset); }
} _PACKED;


#endif  // IPV4_H