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r330675 introduced an extra window check in the LRO code to ensure it

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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
This commit is contained in:
Jonathan T. Looney 2018-04-03 13:54:38 +00:00
parent 12295c211a
commit 4b9dc36454
1 changed files with 4 additions and 4 deletions
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8
sys/netinet/tcp_seq.h
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@ -47,10 +47,10 @@
#define SEQ_MIN(a, b) ((SEQ_LT(a, b)) ? (a) : (b))
#define SEQ_MAX(a, b) ((SEQ_GT(a, b)) ? (a) : (b))
#define WIN_LT(a,b) ((short)(ntohs(a)-ntohs(b)) < 0)
#define WIN_LEQ(a,b) ((short)(ntohs(a)-ntohs(b)) <= 0)
#define WIN_GT(a,b) ((short)(ntohs(a)-ntohs(b)) > 0)
#define WIN_GEQ(a,b) ((short)(ntohs(a)-ntohs(b)) >= 0)
#define WIN_LT(a,b) (ntohs(a) < ntohs(b))
#define WIN_LEQ(a,b) (ntohs(a) <= ntohs(b))
#define WIN_GT(a,b) (ntohs(a) > ntohs(b))
#define WIN_GEQ(a,b) (ntohs(a) >= ntohs(b))
#define WIN_MIN(a, b) ((WIN_LT(a, b)) ? (a) : (b))
#define WIN_MAX(a, b) ((WIN_GT(a, b)) ? (a) : (b))