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#ifndef VJBSDHDR_H

#define VJBSDHDR_H

#include "lwip/tcp.h"

/*

 * Structure of an internet header, naked of options.

 *

 * We declare ip_len and ip_off to be short, rather than u_short

 * pragmatically since otherwise unsigned comparisons can result

 * against negative integers quite easily, and fail in subtle ways.

 */

PACK_STRUCT_BEGIN

struct ip

{

#if defined(NO_CHAR_BITFIELDS)

  u_char   ip_hl_v;  /* bug in GCC for mips means the bitfield stuff will sometimes break - so we use a char for both and get round it with macro's instead... */

#else

#if BYTE_ORDER == LITTLE_ENDIAN

  unsigned ip_hl:4,              /* header length */

           ip_v :4;              /* version */

#elif BYTE_ORDER == BIG_ENDIAN 

  unsigned ip_v :4,              /* version */

           ip_hl:4;              /* header length */

#else

  COMPLAIN - NO BYTE ORDER SELECTED!

#endif

#endif

  u_char  ip_tos;                /* type of service */

  u_short ip_len;                /* total length */

  u_short ip_id;                 /* identification */

  u_short ip_off;                /* fragment offset field */

#define  IP_DF 0x4000            /* dont fragment flag */

#define  IP_MF 0x2000            /* more fragments flag */

#define  IP_OFFMASK 0x1fff       /* mask for fragmenting bits */

  u_char  ip_ttl;                /* time to live */

  u_char  ip_p;                  /* protocol */

  u_short ip_sum;                /* checksum */

  struct  in_addr ip_src,ip_dst; /* source and dest address */

};

PACK_STRUCT_END

typedef u32_t tcp_seq;

/*

 * TCP header.

 * Per RFC 793, September, 1981.

 */

PACK_STRUCT_BEGIN

struct tcphdr

{

  u_short  th_sport;    /* source port */

  u_short  th_dport;    /* destination port */

  tcp_seq  th_seq;      /* sequence number */

  tcp_seq  th_ack;      /* acknowledgement number */

#if defined(NO_CHAR_BITFIELDS)

  u_char   th_x2_off;

#else

#if BYTE_ORDER == LITTLE_ENDIAN

  unsigned th_x2 :4,    /* (unused) */

           th_off:4;    /* data offset */

#endif

#if BYTE_ORDER == BIG_ENDIAN 

  unsigned th_off:4,    /* data offset */

           th_x2 :4;    /* (unused) */

#endif

#endif

  u_char   th_flags;

  u_short  th_win;      /* window */

  u_short  th_sum;      /* checksum */

  u_short  th_urp;      /* urgent pointer */

};

PACK_STRUCT_END

#endif /* VJBSDHDR_H */