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 -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html