netdev - Re: Question about nf_conntrack

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Date:   Wed, 10 Jul 2019 10:07:30 +0200
From:   Florian Westphal <fw@...len.de>
To:     Naruto Nguyen <narutonguyen2018@...il.com>
Cc:     Florian Westphal <fw@...len.de>, 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:
> Could you please elaborate more on how generic tracker tracks ESP connection?

All protocols that do not have a more specific l4 tracker are tracked
based on l3 protocol + l4 proto number.

IOW, any ESP packet sent between the same endpoint addresses is seen
as matching a single esp flow.

We could easily add the ESP SPI as additional distinction marker if needed.