netdev - Re: [PATCH net-next v4 0/2] net: Introducing socket mark receive socket option

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Message-ID: <20150302132925.GB7418@breakpoint.cc>
Date:	Mon, 2 Mar 2015 14:29:25 +0100
From:	Florian Westphal <fw@...len.de>
To:	Eyal Birger <eyal.birger@...il.com>
Cc:	davem@...emloft.net, willemb@...gle.com, edumazet@...gle.com,
	shmulik.ladkani@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v4 0/2] net: Introducing socket mark receive
 socket option

Eyal Birger <eyal.birger@...il.com> wrote:
> This patch set introduces a new socket option for fetching the mark
> of skbs passed to sockets as ancillary data.
> 
> A userspace program may wish to receive the mark of packets it
> receives, for example for distinguishing between different TPROXY
> diversion rules to the same userspace proxy socket.

Hmm... Whats the use case?
Even if you cannot use multiple sockets for every divert rule,
TPROXY doesn't mangle payload; applications could use sockaddrs
returned by accept, getpeername, getsockname etc.  to figure out
which original port/address the packet was sent to?
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