/*
 * Copyright 2006-2012 Haiku, Inc. All Rights Reserved.
 * Distributed under the terms of the MIT License.
 */
#ifndef NETINET_TCP_H
#define NETINET_TCP_H


#include <endian.h>
#include <stdint.h>


struct tcphdr {
        uint16_t        th_sport;       /* source port */
        uint16_t        th_dport;       /* destination port */
        uint32_t        th_seq;
        uint32_t        th_ack;

#if BIG_ENDIAN
        uint8_t         th_off : 4;     /* data offset */
        uint8_t         th_x2 : 4;      /* unused */
#else
        uint8_t         th_x2 : 4;
        uint8_t         th_off : 4;
#endif
        uint8_t         th_flags;
        uint16_t        th_win;
        uint16_t        th_sum;
        uint16_t        th_urp;         /* end of urgent data offset */
} _PACKED;

#if 0
#define TH_FIN  0x01
#define TH_SYN  0x02
#define TH_RST  0x04
#define TH_PUSH 0x08
#define TH_ACK  0x10
#define TH_URG  0x20
#define TH_ECE  0x40
#define TH_CWR  0x80

#define TCPOPT_EOL                              0
#define TCPOPT_NOP                              1
#define TCPOPT_MAXSEG                   2
#define TCPOPT_WINDOW                   3
#define TCPOPT_SACK_PERMITTED   4
#define TCPOPT_SACK                             5
#define TCPOPT_TIMESTAMP                8
#define TCPOPT_SIGNATURE                19

#define MAX_TCPOPTLEN                   40
        /* absolute maximum TCP options length */

#define TCPOLEN_MAXSEG                  4
#define TCPOLEN_WINDOW                  3
#define TCPOLEN_SACK                    8
#define TCPOLEN_SACK_PERMITTED  2
#define TCPOLEN_TIMESTAMP               10
#define TCPOLEN_TSTAMP_APPA             (TCPOLEN_TIMESTAMP + 2)
        /* see RFC 1323, appendix A */
#define TCPOLEN_SIGNATURE               18

#define TCPOPT_TSTAMP_HDR \
    (TCPOPT_NOP << 24 | TCPOPT_NOP << 16 | TCPOPT_TIMESTAMP << 8 | TCPOLEN_TIMESTAMP)

#define TCP_MSS                                 536
#define TCP_MAXWIN                              65535
#define TCP_MAX_WINSHIFT                14

#endif

/* options that can be set using setsockopt() and level IPPROTO_TCP */

#define TCP_NODELAY                             0x01
        /* don't delay sending smaller packets */
#define TCP_MAXSEG                              0x02
        /* set maximum segment size */
#define TCP_NOPUSH                              0x04
        /* don't use TH_PUSH */
#define TCP_NOOPT                               0x08
        /* don't use any TCP options */

#endif  /* NETINET_TCP_H */