netdev - Re: checkentry function

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Message-ID: <20101005144615.0f84d53a@s6510>
Date:	Tue, 5 Oct 2010 14:46:15 +0900
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Nicola Padovano <nicola.padovano@...il.com>
Cc:	netfilter-devel <netfilter-devel@...r.kernel.org>,
	netdev@...r.kernel.org
Subject: Re: checkentry function

On Sat, 2 Oct 2010 13:59:30 +0200
Nicola Padovano <nicola.padovano@...il.com> wrote:

> Hello there.
> I've written checkentry function to check my new target, in this way:
> 
> [CHECK_ENTRY_CODE]
> static bool xt_tarpit_check(const char *tablename, const void *entry,
>                             const struct xt_target *target, void *targinfo,
>                             unsigned int hook_mask)
> {
>  if (strcmp(tablename, "filter"))   {
>     printk(KERN_INFO "DEBUG: the tablename (not FILTER) is %s\n",tablename);
>     return false;
>   }
> return true;
> }
> [/CHECK_ENTRY_CODE]
> 
> but it doesn't work.
> In fact if I do:
> 
> iptables -A INPUT -t filter -s 192.168.0.1 -p tcp -j TAR
> 
> the printk prints this message: DEBUG: the tablename (not FILTER) is: �%H �
> 
> so: in the tablename i haven't the string "filter"...what' the matter?
> 

In current kernels, checkentry returns errno values.
0 = okay
<0 is error (example -EINVAL).
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