This series adds the needed kernel parts to support tcp mss mangling.
First two patches rework exthdr so we don't have to copy-paste too much,
patch 3 adds tcp option mangling support.

Last patch allows to retrieve path tcpmss via rt expression, this is so we
can support iptables TCPMSS --clamp-to-pmtu by combining the two, i.e.:

nft add rule inet mangle forward tcp option mss set rt mss

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