4b9dc36454
captured and reported the highest window advertisement with the same SEQ/ACK. However, the window comparison uses modulo 2**16 math, rather than directly comparing the absolute values. Because windows use absolute values and not modulo 2**16 math (i.e. they don't wrap), we need to compare the absolute values. Reviewed by: gallatin MFC after: 3 days Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D14937
103 lines
3.6 KiB
C
103 lines
3.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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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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#define WIN_LT(a,b) (ntohs(a) < ntohs(b))
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#define WIN_LEQ(a,b) (ntohs(a) <= ntohs(b))
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#define WIN_GT(a,b) (ntohs(a) > ntohs(b))
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#define WIN_GEQ(a,b) (ntohs(a) >= ntohs(b))
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#define WIN_MIN(a, b) ((WIN_LT(a, b)) ? (a) : (b))
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#define WIN_MAX(a, b) ((WIN_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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