64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
/* @(#)tcp.h 1.1 94/10/31 SMI; from UCB 7.2 10/28/86 */
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/*
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* Copyright (c) 1982, 1986 Regents of the University of California.
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* All rights reserved. The Berkeley software License Agreement
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* specifies the terms and conditions for redistribution.
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*/
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#ifndef _netinet_tcp_h
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#define _netinet_tcp_h
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typedef u_long tcp_seq;
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/*
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* TCP header.
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* Per RFC 793, September, 1981.
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*/
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struct tcphdr {
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u_short th_sport; /* source port */
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u_short th_dport; /* destination port */
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tcp_seq th_seq; /* sequence number */
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tcp_seq th_ack; /* acknowledgement number */
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#if defined(vax) || defined(i386)
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u_char th_x2:4, /* (unused) */
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th_off:4; /* data offset */
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#endif
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#if defined(mc68000) || defined(sparc)
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u_char th_off:4, /* data offset */
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th_x2:4; /* (unused) */
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#endif
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u_char th_flags;
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#define TH_FIN 0x01
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#define TH_SYN 0x02
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#define TH_RST 0x04
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#define TH_PUSH 0x08
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#define TH_ACK 0x10
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#define TH_URG 0x20
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u_short th_win; /* window */
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u_short th_sum; /* checksum */
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u_short th_urp; /* urgent pointer */
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};
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#define TCPOPT_EOL 0
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#define TCPOPT_NOP 1
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#define TCPOPT_MAXSEG 2
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/*
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* Default maximum segment size for TCP.
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* With an IP MSS of 576, this is 536,
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* but 512 is probably more convenient.
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*/
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#ifdef lint
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#define TCP_MSS 536
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#else
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#define TCP_MSS MIN(512, IP_MSS - sizeof (struct tcpiphdr))
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#endif
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/*
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* User-settable options (used with setsockopt).
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*/
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#define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
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#define TCP_MAXSEG 0x02 /* set maximum segment size */
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#endif /*!_netinet_tcp_h*/
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