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Date:	Wed, 27 Jun 2007 15:38:51 -0700 (PDT)
From:	David Miller <>
Subject: Re: [PATCH 1/5 2.6.22-rc6] UDP: Introduce UDP encapsulation type
 for L2TP

From: James Chapman <>
Date: Wed, 27 Jun 2007 23:20:38 +0100

> This patch adds a new UDP_ENCAP_L2TPINUDP encapsulation type for UDP
> sockets. When a UDP socket's encap_type is UDP_ENCAP_L2TPINUDP, the
> skb is delivered to a function pointed to by the udp_sock's
> encap_rcv funcptr. If the skb isn't wanted by L2TP, it returns >0, which
> causes it to be passed through to UDP.
> Include padding to put the new encap_rcv field on a 4-byte boundary.
> Previously, the only user of UDP encap sockets was ESP, so when
> CONFIG_XFRM was not defined, some of the encap code was compiled 
> out. This patch changes that. As a result, udp_encap_rcv() will
> now do a little more work when CONFIG_XFRM is not defined. 
> Signed-off-by: James Chapman <>

Patch applied, thanks.

Note that we could use the callback pointer for the XFRM
case too, and I kind of thought you would understand that
logical progression and implement that too :-/

That way we don't need any funny return values, there is
just one and it simply triggers the callback.
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