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Annotation of 43BSDTahoe/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 and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  *
        !            17:  *     @(#)tcp.h       7.5 (Berkeley) 6/29/88
        !            18:  */
        !            19: 
        !            20: typedef        u_long  tcp_seq;
        !            21: /*
        !            22:  * TCP header.
        !            23:  * Per RFC 793, September, 1981.
        !            24:  */
        !            25: struct tcphdr {
        !            26:        u_short th_sport;               /* source port */
        !            27:        u_short th_dport;               /* destination port */
        !            28:        tcp_seq th_seq;                 /* sequence number */
        !            29:        tcp_seq th_ack;                 /* acknowledgement number */
        !            30: #if BYTE_ORDER == LITTLE_ENDIAN 
        !            31:        u_char  th_x2:4,                /* (unused) */
        !            32:                th_off:4;               /* data offset */
        !            33: #endif
        !            34: #if BYTE_ORDER == BIG_ENDIAN 
        !            35:        u_char  th_off:4,               /* data offset */
        !            36:                th_x2:4;                /* (unused) */
        !            37: #endif
        !            38:        u_char  th_flags;
        !            39: #define        TH_FIN  0x01
        !            40: #define        TH_SYN  0x02
        !            41: #define        TH_RST  0x04
        !            42: #define        TH_PUSH 0x08
        !            43: #define        TH_ACK  0x10
        !            44: #define        TH_URG  0x20
        !            45:        u_short th_win;                 /* window */
        !            46:        u_short th_sum;                 /* checksum */
        !            47:        u_short th_urp;                 /* urgent pointer */
        !            48: };
        !            49: 
        !            50: #define        TCPOPT_EOL      0
        !            51: #define        TCPOPT_NOP      1
        !            52: #define        TCPOPT_MAXSEG   2
        !            53: 
        !            54: /*
        !            55:  * Default maximum segment size for TCP.
        !            56:  * With an IP MSS of 576, this is 536,
        !            57:  * but 512 is probably more convenient.
        !            58:  */
        !            59: #ifdef lint
        !            60: #define        TCP_MSS 536
        !            61: #else
        !            62: #define        TCP_MSS MIN(512, IP_MSS - sizeof (struct tcpiphdr))
        !            63: #endif
        !            64: 
        !            65: /*
        !            66:  * User-settable options (used with setsockopt).
        !            67:  */
        !            68: #define        TCP_NODELAY     0x01    /* don't delay send to coalesce packets */
        !            69: #define        TCP_MAXSEG      0x02    /* set maximum segment size */

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