netdev - IPv4 TOS vs DSCP

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Message-ID: <20201112100954.62d696b6@192-168-1-16.tpgi.com.au>
Date:   Thu, 12 Nov 2020 10:09:54 +1000
From:   Russell Strong <russell@...ong.id.au>
To:     netdev@...r.kernel.org
Subject: IPv4 TOS vs DSCP

Hello,

After needing to do policy based routing based on DSCP, I discovered
that IPv4 does not support this.  It does support TOS, but this has
never been upgraded to the new ( now quite old ) DSCP interpretation.

Is there a historical reason why the interpretation has not changed?

I could copy the dscp into a fwmark and then use that, but that seems a
little unnecessarily complicated.  If I were to change this, what would
be the objections?

Russell