root / lab4 / .minix-src / include / netinet / tcp_seq.h @ 13
History | View | Annotate | Download (2.8 KB)
| 1 | 13 | up20180614 | /* $NetBSD: tcp_seq.h,v 1.17 2014/07/25 17:53:59 ryo Exp $ */
|
|---|---|---|---|
| 2 | |||
| 3 | /*
|
||
| 4 | * Copyright (c) 1982, 1986, 1993, 1995
|
||
| 5 | * The Regents of the University of California. All rights reserved.
|
||
| 6 | *
|
||
| 7 | * Redistribution and use in source and binary forms, with or without
|
||
| 8 | * modification, are permitted provided that the following conditions
|
||
| 9 | * are met:
|
||
| 10 | * 1. Redistributions of source code must retain the above copyright
|
||
| 11 | * notice, this list of conditions and the following disclaimer.
|
||
| 12 | * 2. Redistributions in binary form must reproduce the above copyright
|
||
| 13 | * notice, this list of conditions and the following disclaimer in the
|
||
| 14 | * documentation and/or other materials provided with the distribution.
|
||
| 15 | * 3. Neither the name of the University nor the names of its contributors
|
||
| 16 | * may be used to endorse or promote products derived from this software
|
||
| 17 | * without specific prior written permission.
|
||
| 18 | *
|
||
| 19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||
| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||
| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
| 29 | * SUCH DAMAGE.
|
||
| 30 | *
|
||
| 31 | * @(#)tcp_seq.h 8.3 (Berkeley) 6/21/95
|
||
| 32 | */
|
||
| 33 | |||
| 34 | #ifndef _NETINET_TCP_SEQ_H_
|
||
| 35 | #define _NETINET_TCP_SEQ_H_
|
||
| 36 | |||
| 37 | /*
|
||
| 38 | * TCP sequence numbers are 32 bit integers operated
|
||
| 39 | * on with modular arithmetic. These macros can be
|
||
| 40 | * used to compare such integers.
|
||
| 41 | */
|
||
| 42 | #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) |
||
| 43 | #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) |
||
| 44 | #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) |
||
| 45 | #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) |
||
| 46 | #define SEQ_MIN(a, b) ((SEQ_LT(a, b)) ? (a) : (b))
|
||
| 47 | #define SEQ_MAX(a, b) ((SEQ_GT(a, b)) ? (a) : (b))
|
||
| 48 | |||
| 49 | #define SEQ_SUB(a,b) ((long)((a)-(b))) |
||
| 50 | |||
| 51 | /*
|
||
| 52 | * Macros to initialize tcp sequence numbers for
|
||
| 53 | * send and receive from initial send and receive
|
||
| 54 | * sequence numbers.
|
||
| 55 | */
|
||
| 56 | #define tcp_rcvseqinit(tp) \
|
||
| 57 | (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
|
||
| 58 | |||
| 59 | #define tcp_sendseqinit(tp) \
|
||
| 60 | (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ |
||
| 61 | (tp)->snd_recover = (tp)->snd_high = (tp)->snd_fack = (tp)->iss |
||
| 62 | |||
| 63 | #define TCP_ISS_RANDOM_MASK 0x00ffffff /* bits of randomness in a TCP ISS */ |
||
| 64 | #define TCP_ISSINCR 0x01000000 /* increment per time and per conn */ |
||
| 65 | |||
| 66 | #ifdef _KERNEL
|
||
| 67 | extern tcp_seq tcp_iss_seq; /* tcp initial seq # */ |
||
| 68 | #endif
|
||
| 69 | |||
| 70 | #endif /* !_NETINET_TCP_SEQ_H_ */ |