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From: Kristof Provost <kp@FreeBSD.org>
Date: Wed, 17 Aug 2016 09:20:35 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org
Subject: svn commit: r304280 - stable/11/sbin/pfctl
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Author: kp
Date: Wed Aug 17 09:20:35 2016
New Revision: 304280
URL: https://svnweb.freebsd.org/changeset/base/304280

Log:
  MFC r303663:
  
  pfctl: Allow TOS bits to be cleared
  
  TOS value 0 is valid, so use 256 as an invalid value rather than zero.
  This allows users to enforce TOS == 0 with pf.
  
  Reported by:    Radek Krejča <radek.krejca@starnet.cz>

Modified:
  stable/11/sbin/pfctl/parse.y
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sbin/pfctl/parse.y
==============================================================================
--- stable/11/sbin/pfctl/parse.y	Wed Aug 17 09:20:04 2016	(r304279)
+++ stable/11/sbin/pfctl/parse.y	Wed Aug 17 09:20:35 2016	(r304280)
@@ -3593,8 +3593,8 @@ tos	: STRING			{
 			else if ($1[0] == '0' && $1[1] == 'x')
 				$$ = strtoul($1, NULL, 16);
 			else
-				$$ = 0;		/* flag bad argument */
-			if (!$$ || $$ > 255) {
+				$$ = 256;		/* flag bad argument */
+			if ($$ < 0 || $$ > 255) {
 				yyerror("illegal tos value %s", $1);
 				free($1);
 				YYERROR;
@@ -3603,7 +3603,7 @@ tos	: STRING			{
 		}
 		| NUMBER			{
 			$$ = $1;
-			if (!$$ || $$ > 255) {
+			if ($$ < 0 || $$ > 255) {
 				yyerror("illegal tos value %s", $1);
 				YYERROR;
 			}