netdev - Re: [PATCH] net: ip: Do not allow connection to remote port zero

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Message-ID: <1423713974.4942.9.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 11 Feb 2015 20:06:14 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Tom Marshall <tom@...gn.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] net: ip: Do not allow connection to remote port zero

On Wed, 2015-02-11 at 16:58 -0800, Tom Marshall wrote:
> Port zero is reserved according to IANA.
> 
> Note UDP sendto is already disallowed if dport is zero.

I have no idea why we should prevent such thing.

There is nothing wrong sending a TCP frame with dport=0, even if
practically it is not possible to setup a listener on such port using
BSD API.

Maybe some tools are actually using this already to send probes...



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