Subject: Re: [PATCH net-next 3/9] netfilter: nft_exthdr: add boolean DCCP option matching

From: Florian Westphal <[email-masked]>
Date: Fri, 19 May 2023 12:53:48 +0200

Jakub Kicinski <[email-masked]> wrote:
> On Thu, 18 May 2023 12:07:53 +0200 Florian Westphal wrote:
> > From: Jeremy Sowden <[email-masked]>
> > 
> > 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.
> 
> Someone is actually using DCCP ? :o

Don't know but its still seeing *some* activity.
When I asked the same question I was pointed at

https://multipath-dccp.org/

respectively the out-of-tree implementation at
https://github.com/telekom/mp-dccp/

There is also some ietf activity for dccp, e.g.
BBR-like CC:
https://www.ietf.org/archive/id/draft-romo-iccrg-ccid5-00.html