linux-kernel - [30/44] xfrm4: strip ECN and IP Precedence bits in policy lookup

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Message-Id: <20101208000642.565650239@clark.site>
Date:	Tue, 07 Dec 2010 16:04:29 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Ulrich Weber <uweber@...aro.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [30/44] xfrm4: strip ECN and IP Precedence bits in policy lookup

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------


From: Ulrich Weber <uweber@...aro.com>

[ Upstream commit 94e2238969e89f5112297ad2a00103089dde7e8f ]

dont compare ECN and IP Precedence bits in find_bundle
and use ECN bit stripped TOS value in xfrm_lookup

Signed-off-by: Ulrich Weber <uweber@...aro.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 net/ipv4/xfrm4_policy.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/ipv4/xfrm4_policy.c
+++ b/net/ipv4/xfrm4_policy.c
@@ -69,7 +69,7 @@ __xfrm4_find_bundle(struct flowi *fl, st
 		if (xdst->u.rt.fl.oif == fl->oif &&	/*XXX*/
 		    xdst->u.rt.fl.fl4_dst == fl->fl4_dst &&
 		    xdst->u.rt.fl.fl4_src == fl->fl4_src &&
-		    xdst->u.rt.fl.fl4_tos == fl->fl4_tos &&
+                    !((xdst->u.rt.fl.fl4_tos ^ fl->fl4_tos) & IPTOS_RT_MASK) &&
 		    xfrm_bundle_ok(policy, xdst, fl, AF_INET, 0)) {
 			dst_clone(dst);
 			break;
@@ -81,7 +81,7 @@ __xfrm4_find_bundle(struct flowi *fl, st
 
 static int xfrm4_get_tos(struct flowi *fl)
 {
-	return fl->fl4_tos;
+	return IPTOS_RT_MASK & fl->fl4_tos; /* Strip ECN bits */
 }
 
 static int xfrm4_init_path(struct xfrm_dst *path, struct dst_entry *dst,


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