[mpls-linux-general] problems with classes and iptables

[lucapilosu\@libero\.it <luc...@li...>]

Hello, 
I'm trying to differentiate traffic flows in MPLS by marking DSCP field at the source and using scheduling strategies at the LER.
I tried to follow the mpls-linux labs for congestion, in which I found something similar to my case.
In that case the steps are:
1- mapping DSCP on EXP bits of mpls header
2- mapping EXP on the tcindex (scheduling strategy)

In the script by Adrian Popa there are the following commands:

var_best1=`mpls nhlfe add key 0 instructions ds2exp 0xf 0x1A 0x3 exp2tc 0x3 0x1 push gen 300 nexthop ath1 ipv4 10.0.5.3|grep key|cut -c 17-26`

iptables -A FORWARD -s 172.16.30.0/24 -m dscp --dscp 26 -j mpls --nhlfe $var_best1

the iptables command answers to me:
iptables: Invalid argument

I've attached also the result of the command:
strace iptables -A FORWARD -s 172.16.30.0/24 -m dscp --dscp 26 -j mpls --nhlfe 0x02

(0x02 is the previously generated key)

I don't understand where's the problem: I've followed the example and it seems that the problem is in in the -j target of iptables...
Could you please help me?


Actually what I'd like to do is quite simpler: it would be enough to simply give a different mpls label to every class and then associate each label (flow) with a scheduling strategy, without marking exp bits...is it possible?
Thanks in advance,
Luca