62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
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/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for the TCP protocol.
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*
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* Version: @(#)tcp.h 1.0.2 04/28/93
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*
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* Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _LINUX_TCP_H
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#define _LINUX_TCP_H
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#define HEADER_SIZE 64 /* maximum header size */
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struct tcphdr {
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unsigned short source;
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unsigned short dest;
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unsigned long seq;
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unsigned long ack_seq;
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unsigned short res1:4,
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doff:4,
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fin:1,
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syn:1,
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rst:1,
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psh:1,
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ack:1,
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urg:1,
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res2:2;
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unsigned short window;
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unsigned short check;
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unsigned short urg_ptr;
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};
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enum {
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TCP_ESTABLISHED = 1,
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TCP_SYN_SENT,
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TCP_SYN_RECV,
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#if 0
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TCP_CLOSING, /* not a valid state, just a seperator so we can use
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< tcp_closing or > tcp_closing for checks. */
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#endif
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TCP_FIN_WAIT1,
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TCP_FIN_WAIT2,
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TCP_TIME_WAIT,
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TCP_CLOSE,
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TCP_CLOSE_WAIT,
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TCP_LAST_ACK,
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TCP_LISTEN
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};
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#endif /* _LINUX_TCP_H */
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