netdev - Re: [PATCH net,v2] uapi: linux: restore IPPROTO_MAX to 256 and add IPPROTO_UAPI

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Date:   Thu, 13 Apr 2023 00:22:12 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Matthieu Baerts <matthieu.baerts@...sares.net>,
        netfilter-devel@...r.kernel.org, davem@...emloft.net,
        netdev@...r.kernel.org, pabeni@...hat.com, edumazet@...gle.com,
        mathew.j.martineau@...ux.intel.com, mptcp@...ts.linux.dev
Subject: Re: [PATCH net,v2] uapi: linux: restore IPPROTO_MAX to 256 and add
 IPPROTO_UAPI_MAX

On Wed, Apr 12, 2023 at 12:37:18PM -0700, Jakub Kicinski wrote:
> On Wed, 12 Apr 2023 18:35:40 +0200 Matthieu Baerts wrote:
> > > Is this theoretical, or you think any library might be doing this
> > > already? I lack of sufficient knowledge of the MPTCP ecosystem to
> > > evaluate myself.  
> > 
> > This is theoretical.
> > 
> > But using it with socket's protocol parameter is the only good usage of
> > IPPROTO_MAX for me :-D
> 
> Perhaps. No strong preference from me. That said I think I can come up
> with a good name for the SO use: SO_IPPROTO_MAX (which IMHO it's better
> than IPPROTO_UAPI_MAX if Pablo doesn't mind sed'ing?)

SO_ is usually reserved for socket options.

> The name for a max in proto sense... I'm not sure what that would be.
> IPPROTO_MAX_IPPROTO ? IP_IPROTO_MAX ? IP_PROTO_MAX ? Dunno..