| /* @(#) $Header: /tcpdump/master/tcpdump/tcp.h,v 1.3 2000-09-29 05:05:48 guy Exp $ (LBL) */ |
| /* |
| * Copyright (c) 1982, 1986, 1993 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. All advertising materials mentioning features or use of this software |
| * must display the following acknowledgement: |
| * This product includes software developed by the University of |
| * California, Berkeley and its contributors. |
| * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * @(#)tcp.h 8.1 (Berkeley) 6/10/93 |
| */ |
| |
| #ifndef BYTE_ORDER |
| #define LITTLE_ENDIAN 1234 /* least-significant byte first (vax, pc) */ |
| #define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */ |
| #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp)*/ |
| |
| #ifdef WORDS_BIGENDIAN |
| #define BYTE_ORDER BIG_ENDIAN |
| #else |
| #define BYTE_ORDER LITTLE_ENDIAN |
| #endif /* WORDS_BIGENDIAN */ |
| #endif /* BYTE_ORDER */ |
| |
| #if !defined(BYTE_ORDER) || \ |
| (BYTE_ORDER != BIG_ENDIAN && BYTE_ORDER != LITTLE_ENDIAN && \ |
| BYTE_ORDER != PDP_ENDIAN) |
| /* you must determine what the correct bit order is for |
| * your compiler - the next line is an intentional error |
| * which will force your compiles to bomb until you fix |
| * the above macros. |
| */ |
| #error "Undefined or invalid BYTE_ORDER"; |
| #endif |
| |
| typedef u_int 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_int th_x2:4, /* (unused) */ |
| th_off:4; /* data offset */ |
| #endif |
| #if BYTE_ORDER == BIG_ENDIAN |
| u_int 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 |
| #define TCPOLEN_MAXSEG 4 |
| #define TCPOPT_WINDOW 3 |
| #define TCPOLEN_WINDOW 3 |
| #define TCPOPT_SACK_PERMITTED 4 /* Experimental */ |
| #define TCPOLEN_SACK_PERMITTED 2 |
| #define TCPOPT_SACK 5 /* Experimental */ |
| #define TCPOPT_TIMESTAMP 8 |
| #define TCPOLEN_TIMESTAMP 10 |
| #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ |
| |
| #define TCPOPT_TSTAMP_HDR \ |
| (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) |