97 lines
2.3 KiB
C
97 lines
2.3 KiB
C
/*
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* Copyright (c) 1982, 1986 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* @(#)tcp.h 7.5 (Berkeley) 6/29/88
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*/
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#ifndef _NETINET_TCP_H
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#define _NETINET_TCP_H
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#include <arpa/nameser.h>
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#if 0
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/*
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* added by obz
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*/
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#define LITTLE_ENDIAN 1
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#define BIG_ENDIAN 2
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#ifdef i386
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#define BYTE_ORDER LITTLE_ENDIAN
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#else
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<< BYTE_ORDER undefined >>
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#endif
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/*
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* end added by obz
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*/
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#endif
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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 BYTE_ORDER == LITTLE_ENDIAN
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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 BYTE_ORDER == BIG_ENDIAN
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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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