K 10
svn:author
V 8
hselasky
K 8
svn:date
V 27
2022-06-06T20:05:15.073054Z
K 7
svn:log
V 710
tcp: Correctly compute the retransmit length for all 64-bit platforms.

When the TCP sequence number subtracted is greater than 2**32 minus
the window size, or 2**31 minus the window size, the use of unsigned
long as an intermediate variable, may result in an incorrect retransmit
length computation on all 64-bit platforms.

While at it create a helper macro to facilitate the computation of
the difference between two TCP sequence numbers.

Differential Revision:	https://reviews.freebsd.org/D35388
Reviewed by:	rscheff
Sponsored by:	NVIDIA Networking

(cherry picked from commit 28173d49dccb91e50be9c401dbad1da908a5dc75)

Git Hash:   7169d3610d1cb2614aeebb8ae51f2da0314d27f2
Git Author: hselasky@FreeBSD.org
END