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Annotation of 43BSDReno/sys/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 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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