From 6be0e000f32e975c79852d2d990a09cad41fc605 Mon Sep 17 00:00:00 2001 From: Matthias Schiffer Date: Sat, 30 Mar 2013 10:23:12 +0000 Subject: [PATCH] netfilter: ip6t_NPT: Fix translation for non-multiple of 32 prefix lengths 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 Signed-off-by: Pablo Neira Ayuso Signed-off-by: Greg Kroah-Hartman --- net/ipv6/netfilter/ip6t_NPT.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ipv6/netfilter/ip6t_NPT.c b/net/ipv6/netfilter/ip6t_NPT.c index 83acc1405a18..0ea43c7024d5 100644 --- 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 struct ip6t_npt_tginfo *npt, 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; -- 2.43.0