| 1 | /* $OpenBSD: tcp_seq.h,v 1.6 2007/06/15 18:23:06 markus Exp $ */ |
| 2 | /* $NetBSD: tcp_seq.h,v 1.6 1995/03/26 20:32:35 jtc Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (c) 1982, 1986, 1993 |
| 6 | * The Regents of the University of California. All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. Neither the name of the University nor the names of its contributors |
| 17 | * may be used to endorse or promote products derived from this software |
| 18 | * without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 30 | * SUCH DAMAGE. |
| 31 | * |
| 32 | * @(#)tcp_seq.h 8.1 (Berkeley) 6/10/93 |
| 33 | */ |
| 34 | |
| 35 | #ifndef _NETINET_TCP_SEQ_H_ |
| 36 | #define _NETINET_TCP_SEQ_H_ |
| 37 | |
| 38 | /* |
| 39 | * TCP sequence numbers are 32 bit integers operated |
| 40 | * on with modular arithmetic. These macros can be |
| 41 | * used to compare such integers. |
| 42 | */ |
| 43 | #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) |
| 44 | #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) |
| 45 | #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) |
| 46 | #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) |
| 47 | |
| 48 | /* |
| 49 | * Macros to initialize tcp sequence numbers for |
| 50 | * send and receive from initial send and receive |
| 51 | * sequence numbers. |
| 52 | */ |
| 53 | #define tcp_rcvseqinit(tp) \ |
| 54 | (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 |
| 55 | |
| 56 | #define tcp_sendseqinit(tp) \ |
| 57 | (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ |
| 58 | (tp)->iss |
| 59 | |
| 60 | #define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */ |
| 61 | #define TCP_ISSINCR2 (1*1024*1024) /* increment for tcp_iss each second */ |
| 62 | |
| 63 | #ifdef _KERNEL |
| 64 | extern tcp_seq tcp_iss; /* tcp initial send seq # */ |
| 65 | #endif /* _KERNEL */ |
| 66 | #endif /* _NETINET_TCP_SEQ_H_ */ |