linux-kernel - [ 25/73] netfilter: ip6t_NPT: Fix translation for non-multiple of 32 prefix lengths

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Message-Id: <20130509222800.716039455@linuxfoundation.org>
Date:	Thu,  9 May 2013 15:31:48 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Matthias Schiffer <mschiffer@...verse-factory.net>,
	Pablo Neira Ayuso <pablo@...filter.org>
Subject: [ 25/73] netfilter: ip6t_NPT: Fix translation for non-multiple of 32 prefix lengths

3.8-stable review patch.  If anyone has any objections, please let me know.

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

From: Matthias Schiffer <mschiffer@...verse-factory.net>

commit 906b1c394d0906a154fbdc904ca506bceb515756 upstream.

The bitmask used for the prefix mangling was being calculated
incorrectly, leading to the wrong part of the address being replaced
when the prefix length wasn't a multiple of 32.

Signed-off-by: Matthias Schiffer <mschiffer@...verse-factory.net>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/ipv6/netfilter/ip6t_NPT.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/ipv6/netfilter/ip6t_NPT.c
+++ b/net/ipv6/netfilter/ip6t_NPT.c
@@ -57,7 +57,7 @@ static bool ip6t_npt_map_pfx(const struc
 		if (pfx_len - i >= 32)
 			mask = 0;
 		else
-			mask = htonl(~((1 << (pfx_len - i)) - 1));
+			mask = htonl((1 << (i - pfx_len + 32)) - 1);
 
 		idx = i / 32;
 		addr->s6_addr32[idx] &= mask;


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