netdev - Re: xfrm_state locking regression...

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Message-ID: <48DB4EE7.2030109@iki.fi>
Date:	Thu, 25 Sep 2008 11:42:15 +0300
From:	Timo Teräs <timo.teras@....fi>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	jamal <hadi@...erus.ca>
Subject: Re: xfrm_state locking regression...

Herbert Xu wrote:
> On Thu, Sep 25, 2008 at 09:03:21AM +0300, Timo Teräs wrote:
>> I forgot to test pf_key support. And remembered why the "last"
>> thingy was in the walking routines. In pf_key dumps, the dump
>> is terminated when an entry with seq zero is received; that's
>> why the final entry received special treatment. And now that
>> breaks. The first entry is zero so pf_key dumps only one entry.
>>
>> Not sure if we should fix this in pf_key or in the walking routines.
> 
> This is part of the user-space ABI (and an RFC) so wecan't change
> it.  I've put the last stuff back and fixed up the error handling
> on the very last entry.

I was just figuring if we need to change seq in pf_key.c kernel code
or in xfrm_state.c. But I guess it's good if the walking walks as
previously.

Now there is a new problem: if dumping is interrupted and meanwhile
all the remaining entries get deleted, there is no entry to dump
with seq zero when dumping is eventually continued.

Since xfrm_user does not care for the seq as end-of-message, this
problem appears only in af_key.

Maybe we should make af_key.c code instead cache one entry before
sending it to user space. We could then get rid of the last hack
inside xfrm core walking code.

Cheers,
  Timo
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