Dear Sir or Madam

I am currently using nftables under Ubuntu 15.10. Kernel version is 
4.2.0-16-generic and nftables version is nftables v0.4 (Support Edward Snowden).
I was looking for a way to match packets based on the mss optional value in the 
tcp header. While using the describe command, I encountered a segfault:

user@machine:~$ nft describe tcp reserved
Segmentation fault (core dumped)

It is not really a bad bug since the reserved keyword is probably not used 
anyway but I thought to report it. At the same time I wanted to ask if it is 
possible to match packets on wether they have a MaximumSegmentSize set in the 
TCP header or not. I want this since most of the TCP-Syn flood tools seem to 
not set this option and most legitimate TCP stacks do set it.

Greetings
Raffaele Meyer
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