netdev - Re: [PATCH v2] net: introduce ip_local_unbindable

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Message-ID: <20191210091241.0c6df09e@cakuba.netronome.com>
Date:   Tue, 10 Dec 2019 09:12:41 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     subashab@...eaurora.org
Cc:     Maciej Żenczykowski <zenczykowski@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Linux Network Development Mailing List 
        <netdev@...r.kernel.org>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Sean Tranchetti <stranche@...eaurora.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Linux SCTP <linux-sctp@...r.kernel.org>
Subject: Re: [PATCH v2] net: introduce ip_local_unbindable_ports sysctl

On Tue, 10 Dec 2019 07:00:29 +0000, subashab@...eaurora.org wrote:
> > Okay, that's what I was suspecting.  It'd be great if the real
> > motivation for a patch was spelled out in the commit message :/
> > 
> > So some SoCs which run non-vanilla kernels require hacks to steal
> > ports from the networking stack for use by proprietary firmware.
> > 
> > I don't see how merging this patch benefits the community.
> 
> This is just a transparent proxy scenario though.
> We block the specific ports so that there is no unrelated traffic
> belonging to host proxied here incorrectly.

It's a form of one, agreed, although let's be honest - someone reading
the transparent proxy use case in the commit message will not think of
a complex AP scenario, but rather of a locally configured transparent
proxy with IPtables or sockets or such.