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- /* @(#)tcp.h 1.11 88/08/19 SMI; from UCB 7.2 10/28/86 */
-
- /*
- * Copyright (c) 1982, 1986 Regents of the University of California.
- * All rights reserved. The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
- */
-
- #ifndef _netinet_tcp_h
- #define _netinet_tcp_h
-
- 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 defined(vax) || defined(i386)
- u_char th_x2:4, /* (unused) */
- th_off:4; /* data offset */
- #endif
- #if defined(mc68000) || defined(sparc)
- u_char th_off:4; /* data offset */
- u_char 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.
- */
- #ifdef lint
- #define TCP_MSS 536
- #else
- #define TCP_MSS MIN(512, IP_MSS - sizeof (struct tcpiphdr))
- #endif
-
- /*
- * 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 */
-
- #endif /*!_netinet_tcp_h*/
-