netfilter: nf_conntrack: restrict NAT helper invocation to IPv4
authorPatrick McHardy <kaber@trash.net>
Sun, 26 Aug 2012 17:14:01 +0000 (19:14 +0200)
committerPablo Neira Ayuso <pablo@netfilter.org>
Thu, 30 Aug 2012 01:00:12 +0000 (03:00 +0200)
The NAT helpers currently only handle IPv4 packets correctly. Restrict
invocation of the helpers to IPv4 in preparation of IPv6 NAT.

Signed-off-by: Patrick McHardy <kaber@trash.net>

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