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Annotation of Net2/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, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)tcp.h       7.7 (Berkeley) 6/28/90
        !            34:  */
        !            35: 
        !            36: typedef        u_long  tcp_seq;
        !            37: /*
        !            38:  * TCP header.
        !            39:  * Per RFC 793, September, 1981.
        !            40:  */
        !            41: struct tcphdr {
        !            42:        u_short th_sport;               /* source port */
        !            43:        u_short th_dport;               /* destination port */
        !            44:        tcp_seq th_seq;                 /* sequence number */
        !            45:        tcp_seq th_ack;                 /* acknowledgement number */
        !            46: #if BYTE_ORDER == LITTLE_ENDIAN 
        !            47:        u_char  th_x2:4,                /* (unused) */
        !            48:                th_off:4;               /* data offset */
        !            49: #endif
        !            50: #if BYTE_ORDER == BIG_ENDIAN 
        !            51:        u_char  th_off:4,               /* data offset */
        !            52:                th_x2:4;                /* (unused) */
        !            53: #endif
        !            54:        u_char  th_flags;
        !            55: #define        TH_FIN  0x01
        !            56: #define        TH_SYN  0x02
        !            57: #define        TH_RST  0x04
        !            58: #define        TH_PUSH 0x08
        !            59: #define        TH_ACK  0x10
        !            60: #define        TH_URG  0x20
        !            61:        u_short th_win;                 /* window */
        !            62:        u_short th_sum;                 /* checksum */
        !            63:        u_short th_urp;                 /* urgent pointer */
        !            64: };
        !            65: 
        !            66: #define        TCPOPT_EOL      0
        !            67: #define        TCPOPT_NOP      1
        !            68: #define        TCPOPT_MAXSEG   2
        !            69: 
        !            70: /*
        !            71:  * Default maximum segment size for TCP.
        !            72:  * With an IP MSS of 576, this is 536,
        !            73:  * but 512 is probably more convenient.
        !            74:  * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
        !            75:  */
        !            76: #define        TCP_MSS 512
        !            77: 
        !            78: #define        TCP_MAXWIN      65535           /* largest value for window */
        !            79: 
        !            80: /*
        !            81:  * User-settable options (used with setsockopt).
        !            82:  */
        !            83: #define        TCP_NODELAY     0x01    /* don't delay send to coalesce packets */
        !            84: #define        TCP_MAXSEG      0x02    /* set maximum segment size */

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