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Re: [libvirt] [PATCH] nwfilter: probe for inverted ctdir

On 03/21/2013 04:04 PM, Stefan Berger wrote:
> Linux netfilter at some point inverted the meaning of the '--ctdir reply'
> and newer netfilter implementations now expect '--ctdir original'
> instread and vice-versa.


> We probe for this netfilter change via a UDP message over loopback and 3
> filtering rules applied to INPUT. If the sent byte arrives, the newer
> netfilter implementation has been detected.
> Signed-off-by: Stefan Berger <stefanb linux vnet ibm com>
> ---
>  src/nwfilter/nwfilter_ebiptables_driver.c |  123
> ++++++++++++++++++++++++++++++
>  1 file changed, 123 insertions(+)

> +/*
> + * --ctdir original vs. reply's meaning was inverted in the netfilter
> + * at some point. We probe for it.
> + */
> +static bool iptables_ctdir_corrected = false;

C guarantees that this is initialized to false without having to
explicitly state that.

Looks big, but it's a one-time probe done at initialization, and seems
like it does the trick.  You may want to wait for a review from Laine,
but I didn't spot anything else wrong.

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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