Re: [mpls-linux-general] configuring mpls through ioctl()

[James R. L. <jl...@mi...>]

On Wed, Jun 23, 2004 at 06:09:58PM +0300, Muhammad R. Sami wrote:
> Can I issue ioctl system calls from within my libipq application program to
> configure MPLS routing from my application, if yes, can anyone please
> provide me with some example code on how to perform this task.
> Regards,

Yes you can.  All the example code you should need is in
mpls-linux/utils/mplsadm.c

> Muhammad R. Sami 
> Research Assistant, 
> Computer Engineering Department 
> P.O.Box 354 
> King Fahd University of Petroleum & Minerals 
> Dhahran 31261 
> Saudi Arabia. 
> Tel: +96638601423 
> Cell: +96657982951 
> www.ccse.kfupm.edu.sa/sami
> 
> -----Original Message-----
> From: James R. Leu [mailto:jl...@mi...] 
> Sent: Tuesday, June 22, 2004 7:06 PM
> To: Muhammad R. Sami
> Subject: Re: [mpls-linux-general] packet identification
> 
> All of the mplsadm features can be called via ioctl().  Looking at
> the code for mplsadm will give you an example of how to do it.
> 
> On Tue, Jun 22, 2004 at 06:58:27PM +0300, Muhammad R. Sami wrote:
> > I want to write an application that can issue mplsadm commands from
> within,
> > such that I do not have to configure MPLS (labels, LSP, EXP) manually.
> Here
> > are the steps:
> > 
> > 1- Receive packet from kernel to my application through libipq
> > 2- Check packet payload and then decide on NF_ACCEPT/NF_DROP.
> > 3- If NF_ACCEPT, then configure MPLS by issuing the mplsadm instructions
> > from within the application for all accepted packets.
> > 
> > I might also need to set queuing priority here on the basis of EXP value.
> > 
> > Regards,
> > 
> > Muhammad R. Sami 
> > Research Assistant, 
> > Computer Engineering Department 
> > P.O.Box 354 
> > King Fahd University of Petroleum & Minerals 
> > Dhahran 31261 
> > Saudi Arabia. 
> > Tel: +96638601423 
> > Cell: +96657982951 
> > www.ccse.kfupm.edu.sa/sami
> > -----Original Message-----
> > From: James R. Leu [mailto:jl...@mi...] 
> > Sent: Tuesday, June 22, 2004 6:37 PM
> > To: Muhammad R. Sami
> > Subject: Re: [mpls-linux-general] packet identification
> > 
> > On Tue, Jun 22, 2004 at 06:18:11PM +0300, Muhammad R. Sami wrote:
> > > I am using libipq to manipulate packets at userspace. I want to know
> > whether
> > > I can issue an mplsadm configuration command from within my application.
> > For
> > > example, after receiving the packet from the kernel through libipq, I
> > would
> > > like to set EXP value for all such packets by issuing the set_exp
> command
> > > from within that application. If this is possible, please let me know
> > soon.
> > > regards
> > 
> > I'm not sure what you're asking.  Are you trying to manipulate the
> > packet buffer in userland then send it?  Or are you trying to configure
> the
> > forwarding plan to do the manipulation?
> > 
> > 
> > > Muhammad R. Sami 
> > > Research Assistant, 
> > > Computer Engineering Department 
> > > P.O.Box 354 
> > > King Fahd University of Petroleum & Minerals 
> > > Dhahran 31261 
> > > Saudi Arabia. 
> > > Tel: +96638601423 
> > > Cell: +96657982951 
> > > www.ccse.kfupm.edu.sa/sami
> > > -----Original Message-----
> > > From: James R. Leu [mailto:jl...@mi...] 
> > > Sent: Monday, June 21, 2004 5:11 PM
> > > To: Muhammad R. Sami
> > > Subject: Re: [mpls-linux-general] packet identification
> > > 
> > > On Sun, Jun 20, 2004 at 12:48:24PM +0300, Muhammad R. Sami wrote:
> > > > You outlined the following steps, require assistance for the
> following.
> > > > 
> > > >  
> > > > 
> > > > A quick overview of what you will need to setup:
> > > > 
> > > > -bind a IPv4 route to a LSP-----DONE
> > > > 
> > > > -use iptables to identify and mark packets----DONE
> > > > 
> > > > -use the markings to set EXP values (or choose differnt LSPs)----DONE
> > > > 
> > > > -use EXP value to determin queuing priority--------How to do this
> part?
> > > How
> > > > can I assign priority on the basis of EXP bits value?
> > > 
> > > Use the exp2tc or exp2ds instructions then use 'tc' to setup the queues
> > and
> > > priorities.
> > > 
> > > Look at:
> > >
> >
> http://www.linuxsecurity.com/resource_files/firewalls/Adv-Routing-HOWTO/2.4r
> > > outing.html
> > > 
> > > In particular read how to use the TCINDEX.
> > > 
> > > > 
> > > >  
> > > > 
> > > 
> > > -- 
> > > James R. Leu
> > > jl...@mi...
> > > 
> > 
> > -- 
> > James R. Leu
> > jl...@mi...
> > 
> 
> -- 
> James R. Leu
> jl...@mi...
> 

-- 
James R. Leu
jl...@mi...