netdev - Re: [PATCH net-next] udp: Add socket early demux support

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Message-Id: <20120626.143401.445148198931339546.davem@davemloft.net>
Date:	Tue, 26 Jun 2012 14:34:01 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	subramanian.vijay@...il.com
Cc:	netdev@...r.kernel.org, shemminger@...tta.com,
	eric.dumazet@...il.com, alexander.h.duyck@...el.com
Subject: Re: [PATCH net-next] udp: Add socket early demux support


You can't do this.

If the UDP socket has wildcards, that means the source address of the
route will not be validated.  This means we will start accepting
spoofed packets.  It also means the route you are caching is going
to be the wrong route since the keys are variable.

You can only do an early demux where all the keys are fully specified
and there are no wildcards.  That why for TCP we only early demux for
established sockets.
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