PR/53479 CVS commit: src/sys/net/npf

["Maxime Villard" <maxv%netbsd.org@localhost>]

The following reply was made to PR kern/53479; it has been noted by GNATS.

From: "Maxime Villard" <maxv%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/53479 CVS commit: src/sys/net/npf
Date: Fri, 31 Aug 2018 14:16:07 +0000

 Module Name:	src
 Committed By:	maxv
 Date:		Fri Aug 31 14:16:07 UTC 2018
 
 Modified Files:
 	src/sys/net/npf: npf_ext_normalize.c npf_impl.h npf_inet.c
 
 Log Message:
 Introduce npf_set_mss(). When the MSS is not 16bit-aligned, it sets:
 
 	0      8           16          24    32
 	+------+-----------+-----------+------+
 	| data | MSS (low) | MSS (hig) | data |
 	+------+-----------+-----------+------+
 	^                  ^
 	old[0]             old[1]
 
 And sets new[0,1] accordingly with the new value. The MSS-clamping code
 then adjusts twice the checksum on a 16bit boundary:
 
 	from old[0] to new[0]
 	from old[1] to new[1]
 
 Fixes PR/53479, opened by myself. Tested with wireshark and kASan.
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.7 -r1.8 src/sys/net/npf/npf_ext_normalize.c
 cvs rdiff -u -r1.70 -r1.71 src/sys/net/npf/npf_impl.h
 cvs rdiff -u -r1.50 -r1.51 src/sys/net/npf/npf_inet.c
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.