source: trunk/minix/include/net/gen/tcp_hdr.h@ 16

/*
server/ip/gen/tcp_hdr.h
*/

#ifndef __SERVER__IP__GEN__TCP_HDR_H__
#define __SERVER__IP__GEN__TCP_HDR_H__

typedef struct tcp_hdr
{
        tcpport_t th_srcport;
        tcpport_t th_dstport;
        u32_t th_seq_nr;
        u32_t th_ack_nr;
        u8_t th_data_off;
        u8_t th_flags;
        u16_t th_window;
        u16_t th_chksum;
        u16_t th_urgptr;
} tcp_hdr_t;

#define TH_DO_MASK      0xf0

#define TH_FLAGS_MASK   0x3f
#define THF_FIN         0x1
#define THF_SYN         0x2
#define THF_RST         0x4
#define THF_PSH         0x8
#define THF_ACK         0x10
#define THF_URG         0x20

typedef struct tcp_hdropt
{
        int tho_opt_siz;
        u8_t tho_data[TCP_MAX_HDR_SIZE-TCP_MIN_HDR_SIZE];
} tcp_hdropt_t;

#define TCP_OPT_EOL      0
#define TCP_OPT_NOP      1
#define TCP_OPT_MSS      2
#define TCP_OPT_WSOPT    3      /* RFC-1323, window scale option */
#define TCP_OPT_SACKOK   4      /* RFC-2018, SACK permitted */
#define TCP_OPT_TS       8      /* RFC-1323, Timestamps option */
#define TCP_OPT_CCNEW   12      /* RFC-1644, new connection count */

#endif /* __SERVER__IP__GEN__TCP_HDR_H__ */

/*
 * $PchId: tcp_hdr.h,v 1.4 2002/06/10 07:12:22 philip Exp $
 */