linux-kernel - Re: Gettin own IP address thorugh ioctl in kernel space.

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Date:	Wed, 19 Jul 2006 13:56:29 +0200
From:	Erik Mouw <erik@...ddisk-recovery.com>
To:	chinmaya@...omedia.soft.net
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Gettin own IP address thorugh ioctl in kernel space.

On Wed, Jul 19, 2006 at 03:03:24PM +0530, Chinmaya Mishra wrote:
> Can you provide an example how to invoke ioctl on
> device in kernel module.
> 
> For example. I want to find out the IP address of
> my eth0 and I want to make SIOCSIFADDR on it from 
> kernel module.

Sounds like a badly designed module. Do it from userspace.

> At user space i am doing it like this.....
> 
> unsigned long *ip;
> char *iface;
> int sockfd;
> struct ifreq ifr;
> strcpy(ifr.ifr_name, iface);	// interface name 'eth0'
> sockfd = socket(AF_INET,SOCK_DGRAM,0);
> ioctl(sockfd, SIOCGIFADDR, (char*)&ifr);
> memcpy(ip, &(ifr.ifr_addr.sa_data[2]),4); //Copy the ip addr
> close(sockfd);
> 
> How to port this in keernel space.

Not. For the same reasons why you shouldn't read files from kernel
space.


Erik

-- 
+-- Erik Mouw -- www.harddisk-recovery.com -- +31 70 370 12 90 --
| Lab address: Delftechpark 26, 2628 XH, Delft, The Netherlands
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