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

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Message-ID: <CAKD1Yr1V4S3cxvTaBs6pReEZ_3LPobnxdroY+vE3-injHyGt2A@mail.gmail.com>
Date:   Fri, 13 Dec 2019 09:57:18 +0900
From:   Lorenzo Colitti <lorenzo@...gle.com>
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>,
        Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
Subject: Re: [PATCH v2] net: introduce ip_local_unbindable_ports sysctl

On Fri, Dec 13, 2019 at 9:47 AM Jakub Kicinski
<jakub.kicinski@...ronome.com> wrote:
> How are the ports which get reserved communicated between the baseband
> and the AP? Is this part of the standard? Is the driver that talks to
> the base band in the user space and it knows which ports to reserve
> statically? Or does the modem dynamically request ports to
> reserve/inform the host of ports in use?

I'm not an expert in that part of the system, but my understanding is
that the primary way this is used is to pre-allocate a block of ports
to be used by the modem on boot, before other applications can bind to
ports. Subash, do you have more details?