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Annotation of 43BSDReno/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.
        !             4:  *
        !             5:  * Redistribution is only permitted until one year after the first shipment
        !             6:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !             7:  * binary forms are permitted provided that: (1) source distributions retain
        !             8:  * this entire copyright notice and comment, and (2) distributions including
        !             9:  * binaries display the following acknowledgement:  This product includes
        !            10:  * software developed by the University of California, Berkeley and its
        !            11:  * contributors'' in the documentation or other materials provided with the
        !            12:  * distribution and in all advertising materials mentioning features or use
        !            13:  * of this software.  Neither the name of the University nor the names of
        !            14:  * its contributors may be used to endorse or promote products derived from
        !            15:  * this software without specific prior written permission.
        !            16:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            19:  *
        !            20:  *     @(#)tcp.h       7.7 (Berkeley) 6/28/90
        !            21:  */
        !            22: 
        !            23: typedef        u_long  tcp_seq;
        !            24: /*
        !            25:  * TCP header.
        !            26:  * Per RFC 793, September, 1981.
        !            27:  */
        !            28: struct tcphdr {
        !            29:        u_short th_sport;               /* source port */
        !            30:        u_short th_dport;               /* destination port */
        !            31:        tcp_seq th_seq;                 /* sequence number */
        !            32:        tcp_seq th_ack;                 /* acknowledgement number */
        !            33: #if BYTE_ORDER == LITTLE_ENDIAN 
        !            34:        u_char  th_x2:4,                /* (unused) */
        !            35:                th_off:4;               /* data offset */
        !            36: #endif
        !            37: #if BYTE_ORDER == BIG_ENDIAN 
        !            38:        u_char  th_off:4,               /* data offset */
        !            39:                th_x2:4;                /* (unused) */
        !            40: #endif
        !            41:        u_char  th_flags;
        !            42: #define        TH_FIN  0x01
        !            43: #define        TH_SYN  0x02
        !            44: #define        TH_RST  0x04
        !            45: #define        TH_PUSH 0x08
        !            46: #define        TH_ACK  0x10
        !            47: #define        TH_URG  0x20
        !            48:        u_short th_win;                 /* window */
        !            49:        u_short th_sum;                 /* checksum */
        !            50:        u_short th_urp;                 /* urgent pointer */
        !            51: };
        !            52: 
        !            53: #define        TCPOPT_EOL      0
        !            54: #define        TCPOPT_NOP      1
        !            55: #define        TCPOPT_MAXSEG   2
        !            56: 
        !            57: /*
        !            58:  * Default maximum segment size for TCP.
        !            59:  * With an IP MSS of 576, this is 536,
        !            60:  * but 512 is probably more convenient.
        !            61:  * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
        !            62:  */
        !            63: #define        TCP_MSS 512
        !            64: 
        !            65: #define        TCP_MAXWIN      65535           /* largest value for window */
        !            66: 
        !            67: /*
        !            68:  * User-settable options (used with setsockopt).
        !            69:  */
        !            70: #define        TCP_NODELAY     0x01    /* don't delay send to coalesce packets */
        !            71: #define        TCP_MAXSEG      0x02    /* set maximum segment size */

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