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authorMatthias Schiffer <mschiffer@universe-factory.net>2013-03-30 10:23:12 +0000
committerPablo Neira Ayuso <pablo@netfilter.org>2013-04-03 12:24:56 +0200
commit906b1c394d0906a154fbdc904ca506bceb515756 (patch)
treef222e6dc6a92465710e75f57c96e1bf4bb858250 /net
parent5389090b59f7f72a30e25f5fd1fc560340543970 (diff)
downloadlinux-906b1c394d0906a154fbdc904ca506bceb515756.tar.bz2
netfilter: ip6t_NPT: Fix translation for non-multiple of 32 prefix lengths
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>
Diffstat (limited to 'net')
-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 33608c610276..cb631143721c 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;