netdev - Re: Question about nf_conntrack

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Date:   Wed, 26 Jun 2019 13:13:22 +0200
From:   Florian Westphal <fw@...len.de>
To:     Naruto Nguyen <narutonguyen2018@...il.com>
Cc:     netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
        netfilter@...r.kernel.org
Subject: Re: Question about nf_conntrack_proto for IPsec

Naruto Nguyen <narutonguyen2018@...il.com> wrote:
> In linux/latest/source/net/netfilter/ folder, I only see we have
> nf_conntrack_proto_tcp.c, nf_conntrack_proto_udp.c and some other
> conntrack implementations for other protocols but I do not see
> nf_conntrack_proto for IPsec, so does it mean connection tracking
> cannot track ESP or AH protocol as a connection. I mean when I use
> "conntrack -L" command, I will not see ESP or AH  connection is saved
> in conntrack list. Could you please help me to understand if conntrack
> supports that and any reasons if it does not support?

ESP/AH etc. use the generic tracker, i.e. only one ESP connection
is tracked between each endpoint.