From 40e0c6d86514a8dcc80f18fbe8a2945c6ee78f6d Mon Sep 17 00:00:00 2001
From: Ulrich Weber <ulrich.weber@sophos.com>
Date: Tue, 29 Jan 2013 15:24:21 +0100
Subject: [PATCH] netfilter: ip6t_NTP: Use onces complement of csum_fold
we need a 16bit value but not folded
Signed-off-by: Ulrich Weber <ulrich.weber@sophos.com>
---
net/ipv6/netfilter/ip6t_NPT.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
@@ -35,7 +35,7 @@ static int ip6t_npt_checkentry(const struct xt_tgchk_param *par)
src_sum = csum_partial(&npt->src_pfx.in6, sizeof(npt->src_pfx.in6), 0);
dst_sum = csum_partial(&npt->dst_pfx.in6, sizeof(npt->dst_pfx.in6), 0);
- npt->adjustment = csum_fold(csum_sub(src_sum, dst_sum));
+ npt->adjustment = ~csum_fold(csum_sub(src_sum, dst_sum));
return 0;
}
@@ -71,8 +71,8 @@ static bool ip6t_npt_map_pfx(const struct ip6t_npt_tginfo *npt,
return false;
}
- sum = csum_fold(csum_add(csum_unfold((__force __sum16)addr->s6_addr16[idx]),
- csum_unfold(npt->adjustment)));
+ sum = ~csum_fold(csum_add(csum_unfold((__force __sum16)addr->s6_addr16[idx]),
+ csum_unfold(npt->adjustment)));
if (sum == CSUM_MANGLED_0)
sum = 0;
*(__force __sum16 *)&addr->s6_addr16[idx] = sum;
--
1.7.9.5