91 lines
3.0 KiB
C
91 lines
3.0 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 is only permitted until one year after the first shipment
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* of 4.4BSD by the Regents. Otherwise, redistribution and use in source and
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* binary forms are permitted provided that: (1) source distributions retain
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* this entire copyright notice and comment, and (2) distributions including
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* binaries display the following acknowledgement: This product includes
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* software developed by the University of California, Berkeley and its
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* contributors'' in the documentation or other materials provided with the
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* distribution and in all advertising materials mentioning features or use
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* of this software. Neither the name of the University nor the names of
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* its contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* @(#)tcp.h 7.7 (Berkeley) 6/28/90
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*/
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#ifndef BYTE_ORDER
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/*
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* Definitions for byte order,
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* according to byte significance from low address to high.
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*/
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#define LITTLE_ENDIAN 1234 /* least-significant byte first (vax) */
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#define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */
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#define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */
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#ifdef vax
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#define BYTE_ORDER LITTLE_ENDIAN
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#else
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#define BYTE_ORDER BIG_ENDIAN /* mc68000, tahoe, most others */
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#endif
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#endif /* BYTE_ORDER */
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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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#define TCPOPT_WINDOW 3 /* RFC 1323 options */
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#define TCPOPT_TIMESTAMP 8
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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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* This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
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*/
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#define TCP_MSS 512
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#define TCP_MAXWIN 65535 /* largest value for window */
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#define TCP_MAX_WINSHIFT 14 /* largest shift value for window */
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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 (not implemented) */
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