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

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Message-ID: <f4586a2e0607190252g61e97f35o220dfde4e5401afd@mail.gmail.com>
Date:	Wed, 19 Jul 2006 15:22:33 +0530
From:	"Parag N(पराग़)" 
	<panemade@...il.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.

Hi,
On 7/19/06, Chinmaya Mishra <chinmaya4@...il.com> wrote:
> Hi,
>
> 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.
>
>
> 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.
 Check point 29 from http://kasperd.net/~kasperd/comp.os.linux.development.faq.
Modify that source code according to your needs.
Regards,
Parag.
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