* Copyright (c) 1982, 1986 Regents of the University of California.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* @(#)tcp.h 7.7 (Berkeley) 6/28/90
* Per RFC 793, September, 1981.
u_short th_sport
; /* source port */
u_short th_dport
; /* destination port */
tcp_seq th_seq
; /* sequence number */
tcp_seq th_ack
; /* acknowledgement number */
#if BYTE_ORDER == LITTLE_ENDIAN
u_char th_x2
:4, /* (unused) */
th_off
:4; /* data offset */
#if BYTE_ORDER == BIG_ENDIAN
u_char th_off
:4, /* data offset */
u_short th_win
; /* window */
u_short th_sum
; /* checksum */
u_short th_urp
; /* urgent pointer */
* Default maximum segment size for TCP.
* With an IP MSS of 576, this is 536,
* but 512 is probably more convenient.
* This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
#define TCP_MAXWIN 65535 /* largest value for window */
* User-settable options (used with setsockopt).
#define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
#define TCP_MAXSEG 0x02 /* set maximum segment size */