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

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Message-ID: <0101016eee9bfacd-d60e502b-06b1-4870-87e6-c8402b096006-000000@us-west-2.amazonses.com>
Date:   Tue, 10 Dec 2019 07:00:30 +0000
From:   subashab@...eaurora.org
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
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

> 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.