tcp

/* tcp packet format */

struct tcp {
	unsigned short	tcp_sport;	/* source port			*/
	unsigned short	tcp_dport;	/* destination port		*/
		 tcpseq	tcp_seq;	/* sequence			*/
		 tcpseq	tcp_ack;	/* acknowledged sequence	*/
	unsigned char	tcp_offset;
	unsigned char	tcp_code;	/* control flags		*/
	unsigned short	tcp_window;	/* window advertisement		*/
	unsigned short	tcp_cksum;	/* check sum			*/
	unsigned short	tcp_urgptr;	/* urgent pointer		*/
	unsigned char	tcp_data[1];
};