netdev - Question about nf_conntrack

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Date:   Wed, 26 Jun 2019 18:06:45 +0700
From:   Naruto Nguyen <narutonguyen2018@...il.com>
To:     netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
        netfilter@...r.kernel.org
Subject: Question about nf_conntrack_proto for IPsec

Hi everyone,

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?

Thanks a lot,
Brs,
Naruto