1 //==========================================================================
3 // include/netinet_tcp_seq.h
7 //==========================================================================
8 //####BSDCOPYRIGHTBEGIN####
10 // -------------------------------------------
12 // Portions of this software may have been derived from OpenBSD or other sources,
13 // and are covered by the appropriate copyright disclaimers included herein.
15 // -------------------------------------------
17 //####BSDCOPYRIGHTEND####
18 //==========================================================================
19 //#####DESCRIPTIONBEGIN####
22 // Contributors: gthomas
28 //####DESCRIPTIONEND####
30 //==========================================================================
33 /* $OpenBSD: tcp_seq.h,v 1.2 1997/02/24 14:06:46 niklas Exp $ */
34 /* $NetBSD: tcp_seq.h,v 1.6 1995/03/26 20:32:35 jtc Exp $ */
37 * Copyright (c) 1982, 1986, 1993
38 * The Regents of the University of California. All rights reserved.
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 * 3. All advertising materials mentioning features or use of this software
49 * must display the following acknowledgement:
50 * This product includes software developed by the University of
51 * California, Berkeley and its contributors.
52 * 4. Neither the name of the University nor the names of its contributors
53 * may be used to endorse or promote products derived from this software
54 * without specific prior written permission.
56 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
59 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
68 * @(#)tcp_seq.h 8.1 (Berkeley) 6/10/93
71 #ifndef _NETINET_TCP_SEQ_H_
72 #define _NETINET_TCP_SEQ_H_
75 * TCP sequence numbers are 32 bit integers operated
76 * on with modular arithmetic. These macros can be
77 * used to compare such integers.
79 #define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
80 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
81 #define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
82 #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
85 * Macros to initialize tcp sequence numbers for
86 * send and receive from initial send and receive
89 #define tcp_rcvseqinit(tp) \
90 (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
92 #define tcp_sendseqinit(tp) \
93 (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
96 #define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */
99 tcp_seq tcp_iss; /* tcp initial send seq # */
102 #endif // _NETINET_TCP_SEQ_H_