netfilter: bridge: query conntrack about skb dnat
ask conntrack instead of storing ipv4 address in nf_bridge_info->data. Ths avoids the need to use ->data during NF_PRE_ROUTING. Only two functions that need ->data remain. These will be addressed in followup patches. Signed-off-by: NFlorian Westphal <fw@strlen.de> Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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