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authorMatthias Schiffer <mschiffer@universe-factory.net>2013-03-30 10:23:12 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-05-11 13:53:56 -0700
commit6be0e000f32e975c79852d2d990a09cad41fc605 (patch)
tree881b88d416efdebc0ba230cd5939095a4b591f4e
parent6fc08dc6f89960aaf27149f8031009fdc8062a70 (diff)
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 <mschiffer@universe-factory.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--net/ipv6/netfilter/ip6t_NPT.c2
1 files changed, 1 insertions, 1 deletions
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;