Re: [LARTC] tc filter can target only leaf classes?

[Andy Furniss <andy.furniss@dsl.pipex.com>]

Andreas Hasenack wrote:
> (using htb)
> 
> I'm trying to learn tc filter and it seems the flowid parameter can only
> point to leaf classes. Actually, it can point anywhere, but it doesn't
> seem to work unless it points to a leaf class. Is this correct?
> 
> For example, I have this tree:
> 
> 			eth0
> 			|
> 		 +------1:-------+
>                  |               |
>          +------1:10		1:20
>          |       |               |
> 	1:30	1:40		20:
>          |       |
> 	30:	40:
> 
> 1: is htb qdisc, with default pointing to minor 20.
> 
> And this filter:
> 
> iptables -t mangle -A OUTPUT -d $DSTHOST -j MARK --set-mark 1
> tc filter add dev $DEV parent 1:0 prio 1 protocol ip \
>         handle 1 \
>         fw \
>         flowid 1:10
> 
> Now, I only see 1:10 getting the traffic if 1:30 and 1:40 don't exist.
> The moment I add 1:30, 1:40 and their qdiscs, the above filter stops
> working and this same traffic starts going to 1:20, which is the default
> set at 1:'s qdisc. 
> 
> Why does the filter stop working? I was expecting it to keep working and
> then I could further filter this traffic into 1:30 and 1:40 *at* 1:10.

You need other filters with parent 1:10 to send to leafs below 1:10

Andy.
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