netdev - Re: [PATCH] net: introduce ip_local_unbindable

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Message-ID: <20191219131700.GA1159@hmswarspite.think-freely.org>
Date:   Thu, 19 Dec 2019 08:17:00 -0500
From:   Neil Horman <nhorman@...driver.com>
To:     Lorenzo Colitti <lorenzo@...gle.com>
Cc:     Maciej Żenczykowski <zenczykowski@...il.com>,
        Maciej Żenczykowski <maze@...gle.com>,
        "David S . Miller" <davem@...emloft.net>,
        Linux NetDev <netdev@...r.kernel.org>,
        Sean Tranchetti <stranche@...eaurora.org>,
        Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Linux SCTP <linux-sctp@...r.kernel.org>
Subject: Re: [PATCH] net: introduce ip_local_unbindable_ports sysctl

On Thu, Dec 19, 2019 at 06:35:13PM +0900, Lorenzo Colitti wrote:
> On Fri, 13 Dec 2019, 20:49 Neil Horman, <nhorman@...driver.com> wrote:
> > Just out of curiosity, why are the portreserve and portrelease utilities not a
> > solution to this use case?
> 
> As I understand it, those utilities keep the ports reserved by binding
> to them so that no other process can. This doesn't work for Android
> because there are conformance tests that probe the device from the
> network and check that there are no open ports.
> 
But you can address that with some augmentation to portreserve (i.e. just have
it add an iptables rule to drop frames on that port, or respond with a port
unreachable icmp message)

Neil