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Annotation of Net2/netinet/tcp.h, revision 1.1.1.1

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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