netdev - Hairpinning through net/ipv6/sit.c

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Message-ID: <2134F8430051B64F815C691A62D9831832E5DC64@XCH-BLV-504.nw.nos.boeing.com>
Date:	Sat, 9 May 2015 01:18:43 +0000
From:	"Templin, Fred L" <Fred.L.Templin@...ing.com>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Hairpinning through net/ipv6/sit.c

Hello,

In ipip6_rcv() of net/ipv6/sit.c, I am trying to institute "hairpinning". By that,
I mean that when ipip6_rcv() processes an IPv6-in-IPv4 encapsulated packet
I examine IPv6 routing to see if the packet should go back out the same
interface it arrived on. If so directed by routing, I want to rewrite the IPv4
source and destination addresses and directly call ip_local_output(skb)
instead of calling netif_rx(skb). But, when I call ip_local_output(skb), the
system locks up.

Any ideas on what is happening and how to fix it? Or, any ideas on other
ways to do this kind of hairpinning?

Thanks - Fred
fred.l.templin@...ing.com

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