add/delete VLANs programatically

add/delete VLANs programatically

[Eli Cohen]

Hi,
I need to find a way to manipulate VLANs from a kernel module;
specifically, I need to add and remove VLANs. Is that possible at all?
How?

Thanks,
Eli

Re: add/delete VLANs programatically

[Rami Rosen]

Hi,
  -It seems to me that it is possible.

  - If  you look at the ordinary way in which user space add/deletes
VLAN, you will see that this is performed by ioctls (SIOCSIFVLAN for
adding /removing with ADD_VLAN_CMD or DEL_VLAN_CMD).
- It is in performed by user space vconfig - VLAN (802.1q)
configuration program.

- When looking  at how these IOCTLs are handled in the kernel, you
will see that this is done by  vlan_ioctl_handler() in net/8021q/vlan.c.

 -If you look there, you will see that eventually adding a vlan is
done in the kernel by
register_vlan_device(net_device, VLAN ID);
end deleing a vlan is done in the kernel by calling
unregister_vlan_dev(net_device)

So it seems to me possible, though I did not try it.

Regards,
Rami Rosen




On Sun, Sep 7, 2008 at 10:12 AM, Eli Cohen <eli@dev.mellanox.co.il> wrote:
> Hi,
> I need to find a way to manipulate VLANs from a kernel module;
> specifically, I need to add and remove VLANs. Is that possible at all?
> How?
>
> Thanks,
> Eli
> --
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Re: add/delete VLANs programatically

[Eli Cohen]

On Sun, Sep 07, 2008 at 01:58:20PM +0300, Rami Rosen wrote:

Hi Rami.

V> Hi,
>   -It seems to me that it is possible.
> 
>   - If  you look at the ordinary way in which user space add/deletes
> VLAN, you will see that this is performed by ioctls (SIOCSIFVLAN for
> adding /removing with ADD_VLAN_CMD or DEL_VLAN_CMD).
> - It is in performed by user space vconfig - VLAN (802.1q)
> configuration program.
> 
> - When looking  at how these IOCTLs are handled in the kernel, you
> will see that this is done by  vlan_ioctl_handler() in net/8021q/vlan.c.
> 
>  -If you look there, you will see that eventually adding a vlan is
> done in the kernel by
> register_vlan_device(net_device, VLAN ID);
> end deleing a vlan is done in the kernel by calling
> unregister_vlan_dev(net_device)
> 
> So it seems to me possible, though I did not try it.
I saw these functions but they're not exported to kernel modules so it
seems that I won't be able to use them from a kernel module.