fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
93 lines
3.3 KiB
C
93 lines
3.3 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1993, 1995
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)tcp_seq.h 8.3 (Berkeley) 6/21/95
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* $FreeBSD$
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*/
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#ifndef _NETINET_TCP_SEQ_H_
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#define _NETINET_TCP_SEQ_H_
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/*
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* TCP sequence numbers are 32 bit integers operated
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* on with modular arithmetic. These macros can be
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* used to compare such integers.
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*/
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#define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
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#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
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#define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
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#define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
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#define SEQ_MIN(a, b) ((SEQ_LT(a, b)) ? (a) : (b))
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#define SEQ_MAX(a, b) ((SEQ_GT(a, b)) ? (a) : (b))
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/* for modulo comparisons of timestamps */
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#define TSTMP_LT(a,b) ((int)((a)-(b)) < 0)
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#define TSTMP_GT(a,b) ((int)((a)-(b)) > 0)
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#define TSTMP_GEQ(a,b) ((int)((a)-(b)) >= 0)
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/*
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* Macros to initialize tcp sequence numbers for
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* send and receive from initial send and receive
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* sequence numbers.
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*/
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#define tcp_rcvseqinit(tp) \
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(tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
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#define tcp_sendseqinit(tp) \
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(tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
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(tp)->snd_recover = (tp)->iss
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#ifdef _KERNEL
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/*
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* Clock macros for RFC 1323 timestamps.
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*/
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#define TCP_TS_TO_TICKS(_t) ((_t) * hz / 1000)
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/* Timestamp wrap-around time, 24 days. */
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#define TCP_PAWS_IDLE (24 * 24 * 60 * 60 * 1000)
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/*
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* tcp_ts_getticks() in ms, should be 1ms < x < 1000ms according to RFC 1323.
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* We always use 1ms granularity independent of hz.
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*/
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static __inline uint32_t
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tcp_ts_getticks(void)
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{
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struct timeval tv;
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/*
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* getmicrouptime() should be good enough for any 1-1000ms granularity.
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* Do not use getmicrotime() here as it might break nfsroot/tcp.
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*/
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getmicrouptime(&tv);
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return (tv.tv_sec * 1000 + tv.tv_usec / 1000);
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}
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#endif /* _KERNEL */
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#endif /* _NETINET_TCP_SEQ_H_ */
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