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- /*
- * Copyright (c) 1982, 1986 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution is only permitted until one year after the first shipment
- * of 4.4BSD by the Regents. Otherwise, redistribution and use in source and
- * binary forms are permitted provided that: (1) source distributions retain
- * this entire copyright notice and comment, and (2) distributions including
- * binaries display the following acknowledgement: This product includes
- * software developed by the University of California, Berkeley and its
- * contributors'' in the documentation or other materials provided with the
- * distribution and in all advertising materials mentioning features or use
- * of this software. 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 AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- *
- * @(#)tcp.h 7.7 (Berkeley) 6/28/90
- */
-
- typedef u_long tcp_seq;
- /*
- * TCP header.
- * Per RFC 793, September, 1981.
- */
- struct tcphdr {
- 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 */
- #endif
- #if BYTE_ORDER == BIG_ENDIAN
- u_char th_off:4, /* data offset */
- th_x2:4; /* (unused) */
- #endif
- u_char th_flags;
- #define TH_FIN 0x01
- #define TH_SYN 0x02
- #define TH_RST 0x04
- #define TH_PUSH 0x08
- #define TH_ACK 0x10
- #define TH_URG 0x20
- u_short th_win; /* window */
- u_short th_sum; /* checksum */
- u_short th_urp; /* urgent pointer */
- };
-
- #define TCPOPT_EOL 0
- #define TCPOPT_NOP 1
- #define TCPOPT_MAXSEG 2
-
- /*
- * 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_MSS 512
-
- #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 */
-