Re: tc filter matches ip fileds inside pppoe frames

["Ming-Ching Tiew" <mingching.tiew@xxxxxxxxxxx>]

 

Resent using text insted of html.

----- Original Message -----

From: Ming-Ching Tiew

To: lartc@xxxxxxxxxxxxxxx

Sent: Monday, February 05, 2007 9:28 AM

Subject: tc filter matches ip fileds inside pppoe frames

I have a requirement which I guess it is not too unusually, however I haven't

quite figured out how to do it and couldn't find any examples which handle that.

 

I have made myself a Linux-based bridge, eth0 bridged with

eth1 to form br0.

 

In this bridge, I run 'tc' script to handle QoS.

 

So far nothing unusual.

 

However, what's different is that this bridge is sitted in between a pppoe client

and pppoe server, ie pppoe frames are bridge between the Linux bridge, and

I am interested to perform QoS on the pppoe frames, based on the ip tos setting

of the ppp packets ( encapsulated inside the pppoe frames ).

 

For example, normal tc script :-

tc filter add dev ppp0 parent 1:0 prio 10 u32 \
     match ip tos 0x10 0xff \
     flowid 1:4

This will work on a ppp0 device because the ppp0 has ip packets flowing through

it. Now in my bridge, there is no such device, I only have access to eth0 or eth1,

how could I perform the same thing on devices such as eth0 or eth1, but matching

the ip TOS setting inside the pppoe frame ?

 

Best regards.

 

 

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