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[ Upstream commitb9f9a485fb] The xt_dccp iptables module supports the matching of DCCP packets based on the presence or absence of DCCP options. Extend nft_exthdr to add this functionality to nftables. Link: https://bugzilla.netfilter.org/show_bug.cgi?id=930 Signed-off-by: Jeremy Sowden <jeremy@azazel.net> Signed-off-by: Florian Westphal <fw@strlen.de> Stable-dep-of:63331e37fb("netfilter: nf_tables: fix 'exist' matching on bigendian arches") Signed-off-by: Sasha Levin <sashal@kernel.org>