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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 committed by Pablo Neira Ayuso
parent 5389090b59
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) if (pfx_len - i >= 32)
mask = 0; mask = 0;
else else
mask = htonl(~((1 << (pfx_len - i)) - 1)); mask = htonl((1 << (i - pfx_len + 32)) - 1);
idx = i / 32; idx = i / 32;
addr->s6_addr32[idx] &= mask; addr->s6_addr32[idx] &= mask;