root / lab4 / .minix-src / include / netinet / tcp_seq.h @ 14
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| 1 | 13 | up20180614 | /* $NetBSD: tcp_seq.h,v 1.17 2014/07/25 17:53:59 ryo Exp $ */
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| 2 | |||
| 3 | /*
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| 4 | * Copyright (c) 1982, 1986, 1993, 1995
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| 5 | * The Regents of the University of California. All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * 2. Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | * 3. Neither the name of the University nor the names of its contributors
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| 16 | * may be used to endorse or promote products derived from this software
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| 17 | * without specific prior written permission.
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| 18 | *
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 29 | * SUCH DAMAGE.
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| 30 | *
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| 31 | * @(#)tcp_seq.h 8.3 (Berkeley) 6/21/95
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| 32 | */
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| 33 | |||
| 34 | #ifndef _NETINET_TCP_SEQ_H_
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| 35 | #define _NETINET_TCP_SEQ_H_
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| 36 | |||
| 37 | /*
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| 38 | * TCP sequence numbers are 32 bit integers operated
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| 39 | * on with modular arithmetic. These macros can be
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| 40 | * used to compare such integers.
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| 41 | */
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| 42 | #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) |
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| 43 | #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) |
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| 44 | #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) |
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| 45 | #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) |
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| 46 | #define SEQ_MIN(a, b) ((SEQ_LT(a, b)) ? (a) : (b))
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| 47 | #define SEQ_MAX(a, b) ((SEQ_GT(a, b)) ? (a) : (b))
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| 48 | |||
| 49 | #define SEQ_SUB(a,b) ((long)((a)-(b))) |
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| 50 | |||
| 51 | /*
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| 52 | * Macros to initialize tcp sequence numbers for
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| 53 | * send and receive from initial send and receive
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| 54 | * sequence numbers.
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| 55 | */
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| 56 | #define tcp_rcvseqinit(tp) \
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| 57 | (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
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| 58 | |||
| 59 | #define tcp_sendseqinit(tp) \
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| 60 | (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ |
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| 61 | (tp)->snd_recover = (tp)->snd_high = (tp)->snd_fack = (tp)->iss |
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| 62 | |||
| 63 | #define TCP_ISS_RANDOM_MASK 0x00ffffff /* bits of randomness in a TCP ISS */ |
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| 64 | #define TCP_ISSINCR 0x01000000 /* increment per time and per conn */ |
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| 65 | |||
| 66 | #ifdef _KERNEL
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| 67 | extern tcp_seq tcp_iss_seq; /* tcp initial seq # */ |
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| 68 | #endif
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| 69 | |||
| 70 | #endif /* !_NETINET_TCP_SEQ_H_ */ |