#ifndef _TCP_H_
#define _TCP_H_

#include <netutil/ip.h>
#include <netutil/types.h>


//#define TCP_DEBUG_OPTION 1

#if defined(TCP_DEBUG_OPTION)
#define TCP_DEBUG(x...) debug_printf("[tcp] " x);
#else
#define TCP_DEBUG(fmt, ...) ((void)0)
#endif

/**
 * TCP header
 */

#define TCP_FIN 0x0001
#define TCP_SYN 0x0002
#define TCP_RST 0x0004
#define TCP_PSH 0x0008
#define TCP_ACK 0x0010
#define TCP_URG 0x0020

#define TCP_OPTION_END 0
#define TCP_OPTION_NOOP 1
#define TCP_OPTION_MSS 2

struct tcp_hdr {
  struct uint16_net src;
  struct uint16_net dest;  /* src/dest TCP ports */
  struct uint32_net seq;
  struct uint32_net ack;
  struct uint16_net flags;
  struct uint16_net wnd;
  struct uint16_net chksum;
  struct uint16_net up;
} __attribute__((__packed__));

#define TCP_HLEN_MIN 20
#define TCP_HLEN(hdr) ((uint16_rd((hdr)->flags) >> 12) * 4)

#endif