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>
This commit is contained in:
Matthias Schiffer 2013-03-30 10:23:12 +00:00 коммит произвёл Pablo Neira Ayuso
Родитель 5389090b59
Коммит 906b1c394d
1 изменённых файлов: 1 добавлений и 1 удалений

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@ -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;