Re: [PATCH net-next 1/2] net/ipv6/udp: Add encap_rcv support to IPv6 UDP

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From: Benjamin LaHaise <bcrl@xxxxxxxxx>
Date: Tue, 10 Apr 2012 22:20:47 -0400

> At present, UDP encapsulated protocols (like L2TP) are only able to use the
> encap_rcv hook with UDP over IPv4.  This patch adds the same support for use
> with UDP over IPv6.
> 
> Signed-off-by: Benjamin LaHaise <bcrl@xxxxxxxxx>

This isn't right at all.

The return value of udpv6_queue_rcv_skb() ignorred at all
call sites except when it is invoked via ->backlog_rcv(), which
expects a different kind of return value, not an encap operation
indication.

So the whole "requeue as proto '-N'" logic isn't going to ever work.

You need to do what the ipv4 side does, split the routine into
two parts:

1) A __udpv6_queue_rcv_skb() which purely handles socket queueing
   cases.  It does not handle encap or anything like that.

   This is what is what you hook into ->backlog_rcv for ipv6 udp.

2) A udpv6_queue_rcv_skb() which is invoked by the UDPv6 socket demux
   on receive, and which will properly propagate the return values
   back down into ipv6 input to do the "requeue as proto '-N'" stuff.

Please resubmit both of these patches once you've fixed this up (and
tested it).
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