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- /*
- * Copyright (c) 1982, 1986 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms are permitted
- * provided that the above copyright notice and this paragraph are
- * duplicated in all such forms and that any documentation,
- * advertising materials, and other materials related to such
- * distribution and use acknowledge that the software was developed
- * by the University of California, Berkeley. The name of the
- * University may not 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 MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- *
- * @(#)tcp.h 7.4.1.2 (Berkeley) 2/17/89
- */
- #ifndef BYTE_ORDER
- /*
- * Definitions for byte order,
- * according to byte significance from low address to high.
- */
- #define LITTLE_ENDIAN 1234 /* least-significant byte first (vax) */
- #define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */
- #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */
-
- #ifdef vax
- #define BYTE_ORDER LITTLE_ENDIAN
- #else
- #define BYTE_ORDER BIG_ENDIAN /* mc68000, tahoe, most others */
- #endif
- #endif /* BYTE_ORDER */
-
- typedef u_long tcp_seq;
- /*
- * TCP header.
- * Per RFC 793, September, 1981.
- */
- #define TH_FIN 0x01
- #define TH_SYN 0x02
- #define TH_RST 0x04
- #define TH_PUSH 0x08
- #define TH_ACK 0x10
- #define TH_URG 0x20
-
- 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 */
-
- #ifdef LATTICE
- u_int th_off:4, /* data offset */
- th_x2:4, /* reserved */
- th_flags:8, /* URG, ACK, PSH, RST, SYN, FIN */
- th_win:16; /* window size */
- #elif AZTEC_C
- u_int th_win:16,
- th_flags:8,
- th_x2:4, /* (unused) */
- th_off:4; /* data offset */
- #else /* Manx 3.6 */
- short th_flags:8,
- th_x2:4, /* (unused) */
- th_off:4; /* data offset */
- u_short th_win; /* window */
- #endif
-
- 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
- #ifndef IP_MSS
- #define IP_MSS 576
- #endif
- #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 */
-