mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-20 11:11:24 +00:00
d8951c8a2f
hz >> 1000 and thus getting outside the timestamp clock frequenceny of 1ms < x < 1s per tick as mandated by RFC1323, leading to connection resets on idle connections. Always use a granularity of 1ms using getmicrouptime() making all but relevant callouts independent of hz. Use getmicrouptime(), not getmicrotime() as the latter may make a jump possibly breaking TCP nfsroot mounts having our timestamps move forward for more than 24.8 days in a second without having been idle for that long. PR: kern/61404 Reviewed by: jhb, mav, rrs Discussed with: silby, lstewart Sponsored by: Sandvine Incorporated (originally in 2011) MFC after: 6 weeks
96 lines
3.3 KiB
C
96 lines
3.3 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.
|
|
* 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)
|
|
|
|
#define SEQ_MIN(a, b) ((SEQ_LT(a, b)) ? (a) : (b))
|
|
#define SEQ_MAX(a, b) ((SEQ_GT(a, b)) ? (a) : (b))
|
|
|
|
/* for modulo comparisons of timestamps */
|
|
#define TSTMP_LT(a,b) ((int)((a)-(b)) < 0)
|
|
#define TSTMP_GT(a,b) ((int)((a)-(b)) > 0)
|
|
#define TSTMP_GEQ(a,b) ((int)((a)-(b)) >= 0)
|
|
|
|
/*
|
|
* 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)->snd_recover = (tp)->iss
|
|
|
|
#ifdef _KERNEL
|
|
/*
|
|
* Clock macros for RFC 1323 timestamps.
|
|
*/
|
|
#define TCP_TS_TO_TICKS(_t) ((_t) * hz / 1000)
|
|
|
|
/* Timestamp wrap-around time, 24 days. */
|
|
#define TCP_PAWS_IDLE (24 * 24 * 60 * 60 * 1000)
|
|
|
|
/*
|
|
* tcp_ts_getticks() in ms, should be 1ms < x < 1000ms according to RFC 1323.
|
|
* We always use 1ms granularity independent of hz.
|
|
*/
|
|
static __inline u_int
|
|
tcp_ts_getticks(void)
|
|
{
|
|
struct timeval tv;
|
|
u_long ms;
|
|
|
|
/*
|
|
* getmicrouptime() should be good enough for any 1-1000ms granularity.
|
|
* Do not use getmicrotime() here as it might break nfsroot/tcp.
|
|
*/
|
|
getmicrouptime(&tv);
|
|
ms = tv.tv_sec * 1000 + tv.tv_usec / 1000;
|
|
|
|
return (ms);
|
|
}
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* _NETINET_TCP_SEQ_H_ */
|