| /* |
| * 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 7.5 (Berkeley) 6/29/88 |
| */ |
| |
| #ifndef _NETINET_IP_TCP_H |
| #define _NETINET_IP_TCP_H |
| |
| #include <endian.h> |
| #include <linux/socket.h> |
| #include <sys/types.h> |
| |
| typedef u_int32_t 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. |
| */ |
| #ifdef lint |
| #define TCP_MSS 536 |
| #else |
| #define TCP_MSS MIN(512, IP_MSS - sizeof (struct tcpiphdr)) |
| #endif |
| |
| #endif /* _NETINET_TCP_H */ |