netdev - Re: Is there any function similar to inet

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Message-ID: <43ca39800811211508i13b3073akfa48284f96eae69c@mail.gmail.com>
Date:	Sat, 22 Nov 2008 00:08:06 +0100
From:	"Julius Volz" <julius.volz@...il.com>
To:	"Roar Bjørgum Rotvik" <roarbr@...lde.org>
Cc:	linux_kernel_chan@...oo.com, netdev@...r.kernel.org
Subject: Re: Is there any function similar to inet_ntoa() in Kernel or NetFilter ?

On Thu, Nov 20, 2008 at 10:34 AM, Roar Bjørgum Rotvik <roarbr@...lde.org> wrote:
> Kunsheng Chen wrote:
>> I am doing a project similar to iptable using netfilter, currently I want
>> to convert a IP address from 'long int' back to dotted address.
>>
>> I don't know whether there is some functions inside kernel or netfilter
>> that could make that like using inet_ntoa() in <arpa/inet.h>
>
> How about NIPQUAD and NIPQUAD_FMT (for IPv4):
> http://lxr.linux.no/linux+v2.6.27.6/include/linux/kernel.h#L324
> http://lxr.linux.no/linux+v2.6.27.6/include/linux/kernel.h#L319

In the latest tree, there are now "%pI4" and "%pI6" format options for printk.

For example:

printk(KERN_DEBUG "Address: %pI4\n", &v4_addr);

Julius
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