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netfilter: ip6t_NPT: Fix translation for non-multiple of 32 prefix lengths

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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 <[email protected]>
Signed-off-by: Pablo Neira Ayuso <[email protected]>
This commit is contained in:
Matthias Schiffer 2013-03-30 10:23:12 +00:00 • committed by Pablo Neira Ayuso
commit 906b1c394d
1 changed files with 1 additions and 1 deletions
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2
net/ipv6/netfilter/ip6t_NPT.c
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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;