IPv6 traffic class header field

Hi,

is there anyone who can tell me how to set the traffic class in an IPv6 UDP
socket? (SOCK_DGRAM)
I can already set the flow label, but not the Traffic Class.  I run Linux,
kernel 2.4.18 (and above).

hope you can help

greetings
_____________________________________________
Felix Ogg             (TU/e graduate student)
Tel: +31 40 27 45605
Department Software Architectures [WDC 2.010]
Philips Research/Natuurkundig Laboratorium
Prof. Holstlaan 4, 5656 AA  EINDHOVEN