netdev - Re: [FYI] xfrm: Don't lookup sk_policy for timewait sockets

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Date:	Thu, 09 Apr 2015 17:07:20 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	fw@...len.de
Cc:	eric.dumazet@...il.com, sebastian.poehn@...il.com,
	netdev@...r.kernel.org
Subject: Re: [FYI] xfrm: Don't lookup sk_policy for timewait sockets

From: Florian Westphal <fw@...len.de>
Date: Thu, 9 Apr 2015 21:14:41 +0200

> I re-introduced this in fd158d79d33d3c under the assumption
> that the input path handles skb->sk timewait sockets correctly
> after all the early demux changes, afaics tcp edemux can also
> assign skb->sk timewait sockets.
> 
> Also, reporter mentions 3.8 as affected which should not assign
> tw sockets to skb->sk.
> 
> Even more strange, the reporters backtrace seems to indicate
> crash at end of forward path.
> 
> Sebastian, can you disable tw assignment via TPROXY in 3.12 just
> to see if it makes a difference?
> 
> [ not doing the assignment is safe provided you still set tproxy mark
>   on the skb; policy routing will ensure local delivery ].

My assumption in my analysis is that TPROXY writes the socket to
skb->sk, and it is also being forwarded.  And yes this is based
upon his backtrace.

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