netdev - Re: [PATCH net] l2tp: Allow duplicate session creation with UDP

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Message-ID: <20200131125050.GB32428@pc-61.home>
Date:   Fri, 31 Jan 2020 13:50:50 +0100
From:   Guillaume Nault <gnault@...hat.com>
To:     Tom Parkin <tparkin@...alix.com>
Cc:     James Chapman <jchapman@...alix.com>,
        Ridge Kennedy <ridgek@...iedtelesis.co.nz>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net] l2tp: Allow duplicate session creation with UDP

On Fri, Jan 31, 2020 at 09:55:54AM +0000, Tom Parkin wrote:
> On  Thu, Jan 30, 2020 at 23:34:40 +0100, Guillaume Nault wrote:
> > To summarise my idea:
> > 
> >   * Short term plan:
> >     Integrate a variant of Ridge's patch, as it's simple, can easily be
> >     backported to -stable and doesn't prevent the future use of global
> >     session IDs (as those will be specified with L2TP_ATTR_SCOPE).
> > 
> >   * Long term plan:
> >     Implement L2TP_ATTR_SCOPE, a session attribute defining if the
> >     session ID is global or scoped to the X-tuple (3-tuple for IP,
> >     5-tuple for UDP).
> >     Original behaviour would be respected to avoid breaking existing
> >     applications. So, by default, IP encapsulation would use global
> >     scope and UDP encapsulation would use 5-tuple scope.
> > 
> > Does that look like a good way forward?
> 
> FWIW, this sounds reasonable to me too.
> 
Nice to see that we're all on the same page.
Thanks!