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Annotation of 43BSD/sys/netinet/tcp.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)tcp.h       7.1 (Berkeley) 6/5/86
        !             7:  */
        !             8: 
        !             9: typedef        u_long  tcp_seq;
        !            10: /*
        !            11:  * TCP header.
        !            12:  * Per RFC 793, September, 1981.
        !            13:  */
        !            14: struct tcphdr {
        !            15:        u_short th_sport;               /* source port */
        !            16:        u_short th_dport;               /* destination port */
        !            17:        tcp_seq th_seq;                 /* sequence number */
        !            18:        tcp_seq th_ack;                 /* acknowledgement number */
        !            19: #ifdef vax
        !            20:        u_char  th_x2:4,                /* (unused) */
        !            21:                th_off:4;               /* data offset */
        !            22: #endif
        !            23:        u_char  th_flags;
        !            24: #define        TH_FIN  0x01
        !            25: #define        TH_SYN  0x02
        !            26: #define        TH_RST  0x04
        !            27: #define        TH_PUSH 0x08
        !            28: #define        TH_ACK  0x10
        !            29: #define        TH_URG  0x20
        !            30:        u_short th_win;                 /* window */
        !            31:        u_short th_sum;                 /* checksum */
        !            32:        u_short th_urp;                 /* urgent pointer */
        !            33: };
        !            34: 
        !            35: #define        TCPOPT_EOL      0
        !            36: #define        TCPOPT_NOP      1
        !            37: #define        TCPOPT_MAXSEG   2
        !            38: 
        !            39: /*
        !            40:  * Default maximum segment size for TCP.
        !            41:  * With an IP MSS of 576, this is 536,
        !            42:  * but 512 is probably more convenient.
        !            43:  */
        !            44: #ifdef lint
        !            45: #define        TCP_MSS 536
        !            46: #else
        !            47: #define        TCP_MSS MIN(512, IP_MSS - sizeof (struct tcpiphdr))
        !            48: #endif
        !            49: 
        !            50: /*
        !            51:  * User-settable options (used with setsockopt).
        !            52:  */
        !            53: #define        TCP_NODELAY     0x01    /* don't delay send to coalesce packets */
        !            54: #define        TCP_MAXSEG      0x02    /* set maximum segment size */

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