mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-26 11:47:31 +00:00
103 lines
3.9 KiB
C
103 lines
3.9 KiB
C
/*
|
|
* Copyright (c) 1982, 1986, 1993, 1995
|
|
* 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_seq.h 8.3 (Berkeley) 6/21/95
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _NETINET_TCP_SEQ_H_
|
|
#define _NETINET_TCP_SEQ_H_
|
|
/*
|
|
* TCP sequence numbers are 32 bit integers operated
|
|
* on with modular arithmetic. These macros can be
|
|
* used to compare such integers.
|
|
*/
|
|
#define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
|
|
#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
|
|
#define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
|
|
#define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
|
|
|
|
/* for modulo comparisons of timestamps */
|
|
#define TSTMP_LT(a,b) ((int)((a)-(b)) < 0)
|
|
#define TSTMP_GEQ(a,b) ((int)((a)-(b)) >= 0)
|
|
|
|
/*
|
|
* TCP connection counts are 32 bit integers operated
|
|
* on with modular arithmetic. These macros can be
|
|
* used to compare such integers.
|
|
*/
|
|
#define CC_LT(a,b) ((int)((a)-(b)) < 0)
|
|
#define CC_LEQ(a,b) ((int)((a)-(b)) <= 0)
|
|
#define CC_GT(a,b) ((int)((a)-(b)) > 0)
|
|
#define CC_GEQ(a,b) ((int)((a)-(b)) >= 0)
|
|
|
|
/* Macro to increment a CC: skip 0 which has a special meaning */
|
|
#define CC_INC(c) (++(c) == 0 ? ++(c) : (c))
|
|
|
|
/*
|
|
* Macros to initialize tcp sequence numbers for
|
|
* send and receive from initial send and receive
|
|
* sequence numbers.
|
|
*/
|
|
#define tcp_rcvseqinit(tp) \
|
|
(tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
|
|
|
|
#define tcp_sendseqinit(tp) \
|
|
(tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
|
|
(tp)->iss
|
|
|
|
#define TCP_PAWS_IDLE (24 * 24 * 60 * 60 * hz)
|
|
/* timestamp wrap-around time */
|
|
|
|
#ifdef _KERNEL
|
|
extern tcp_cc tcp_ccgen; /* global connection count */
|
|
|
|
/*
|
|
* Increment for tcp_iss each second.
|
|
* This is designed to increment at the standard 250 KB/s,
|
|
* but with a random component averaging 128 KB.
|
|
* We also increment tcp_iss by a quarter of this amount
|
|
* each time we use the value for a new connection.
|
|
* If defined, the tcp_random18() macro should produce a
|
|
* number in the range [0-0x3ffff] that is hard to predict.
|
|
*/
|
|
#ifndef tcp_random18
|
|
#define tcp_random18() (arc4random() & 0x3ffff)
|
|
#endif
|
|
#define TCP_ISSINCR (122*1024 + tcp_random18())
|
|
|
|
extern tcp_seq tcp_iss; /* tcp initial send seq # */
|
|
#else
|
|
#define TCP_ISSINCR (250*1024) /* increment for tcp_iss each second */
|
|
#endif /* _KERNEL */
|
|
#endif /* _NETINET_TCP_SEQ_H_ */
|