netdev - Re: oops in net/ipv4/icmp.c:icmp_send() with icmp_errors_use_inbound

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Message-ID: <4651CAA9.4050908@trash.net>
Date:	Mon, 21 May 2007 18:36:57 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	netdev@...r.kernel.org, jmorris@...ei.org, Curtis@...enkey.net,
	davem@...emloft.net
Subject: Re: oops in net/ipv4/icmp.c:icmp_send() with icmp_errors_use_inbound_ifaddr
 (fwd)

Herbert Xu wrote:
> Patrick McHardy <kaber@...sh.net> wrote:
> 
>>This leaves the question what to do in the path after ip_output,
>>when skb->dev points to the output device. We don't know the
>>input device anymore, so there doesn't seem to be a way to make
>>it do what the sysctl promises.
> 
> 
> Perhaps we could change things so that the setting of skb->dev is
> delayed until the packet has completely left the IP stack?  It'd
> require a massive audit though of the IP stack though.


The IP stack shouldn't be too hard, we currently set skb->dev in
ip_output, after that we only have the POST_ROUTING hook and ip_fragment
which care. It wouldn't help with ipip/ip_gre though, at that point
skb->dev must point to the tunnel device.

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