netfilter: nat: fix udp checksum corruption
Due to copy&paste error nf_nat_mangle_udp_packet passes IPPROTO_TCP, resulting in incorrect udp checksum when payload had to be mangled. Fixes: dac3fe72 ("netfilter: nat: remove csum_recalc hook") Reported-by: Marc Haber <mh+netdev@zugschlus.de> Tested-by: Marc Haber <mh+netdev@zugschlus.de> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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