linux-kernel - Re: [PATCH 4/4] netfilter: Fix format string of nfnetlink

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Message-ID: <20150313121539.GA14488@salvia>
Date:	Fri, 13 Mar 2015 13:15:39 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Richard Weinberger <richard@....at>
Cc:	netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
	coreteam@...filter.org, netfilter-devel@...r.kernel.org,
	linux-kernel@...r.kernel.org, sameo@...ux.intel.com,
	aloisio.almeida@...nbossa.org, lauro.venancio@...nbossa.org,
	davem@...emloft.net, kadlec@...ckhole.kfki.hu, kaber@...sh.net
Subject: Re: [PATCH 4/4] netfilter: Fix format string of nfnetlink_queue proc
 file

On Fri, Mar 13, 2015 at 12:31:16PM +0100, Richard Weinberger wrote:
> The printed values are all of type unsigned integer, therefore use
> %u instead of %d. Otherwise an user can face negative values.
> 
> Fixes:
> $ cat /proc/net/netfilter/nfnetlink_queue
>     0  29508   278 2 65531     0 2004213241 -2129885586  1
>     1 -27747     0 2 65531     0     0        0  1
>     2 -27748     0 2 65531     0     0        0  1

I guess you want to access stats on dropped packets.

I prefer if you extend nfnetlink_queue to provide statistics through
nfnetlink_queue, so you don't have to manually parse this text-based
/proc entry and we can deprecate this interface. That shouldn't have
been there in first place.

Thanks.

> Signed-off-by: Richard Weinberger <richard@....at>
> ---
>  net/netfilter/nfnetlink_queue_core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/netfilter/nfnetlink_queue_core.c b/net/netfilter/nfnetlink_queue_core.c
> index 1b7f7b8..2121ab5 100644
> --- a/net/netfilter/nfnetlink_queue_core.c
> +++ b/net/netfilter/nfnetlink_queue_core.c
> @@ -1243,7 +1243,7 @@ static int seq_show(struct seq_file *s, void *v)
>  {
>  	const struct nfqnl_instance *inst = v;
>  
> -	seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
> +	seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n",
>  		   inst->queue_num,
>  		   inst->peer_portid, inst->queue_total,
>  		   inst->copy_mode, inst->copy_range,
> -- 
> 1.8.4.5
> 
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