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Feed nft-generated ruleset to iptables-nft.
At this time, this will NOT pass. because dissector can handle
meta l4proto tcp ip saddr 1.2.3.4
but not
ip saddr 1.2.3.4 meta l4proto tcp
In the latter case, iptables-nft picks up the immediate value (6) as the ip
address, because the first one (1.2.3.4) gets moved as PAYLOAD_PREV due to
missing 'removal' of the CTX_PAYLOAD flag.
This is error prone, so lets rewrite the dissector to track each
register separately and auto-clear state on writes.
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Phil Sutter <phil@nwl.cc>
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