netdev - Re: [PATCH v2 net-next] inet: add IP_BIND_ADDRESS_NO

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Date:	Sat, 06 Jun 2015 23:57:33 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	ncardwell@...gle.com, netdev@...r.kernel.org,
	mtk.manpages@...il.com, maze@...gle.com
Subject: Re: [PATCH v2 net-next] inet: add IP_BIND_ADDRESS_NO_PORT to
 overcome bind(0) limitations

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Sat, 06 Jun 2015 21:17:57 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> When an application needs to force a source IP on an active TCP socket
> it has to use bind(IP, port=x).
> 
> As most applications do not want to deal with already used ports, x is
> often set to 0, meaning the kernel is in charge to find an available
> port.
> But kernel does not know yet if this socket is going to be a listener or
> be connected.
> It has very limited choices (no full knowledge of final 4-tuple for a
> connect())
> 
> With limited ephemeral port range (about 32K ports), it is very easy to
> fill the space.
> 
> This patch adds a new SOL_IP socket option, asking kernel to ignore
> the 0 port provided by application in bind(IP, port=0) and only
> remember the given IP address.
> 
> The port will be automatically chosen at connect() time, in a way
> that allows sharing a source port as long as the 4-tuples are unique.
> 
> This new feature is available for both IPv4 and IPv6 (Thanks Neal)
> 
> Tested:
 ...
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Looks good, applied, thanks Eric.
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