Find the offset or total length for upper layer protocol in IPv6 packet

[left4dead]

Hi,

Is there any way to identify an upper layer protocol's offset or total packet length for an IPv6 packet? I know we can iterate through all of the associated headers using ipv6Packet.getPayLoad().iterator().
However, I am having difficulty in getting the actual protocol type for the last packet retrieved using the above-mentioned iterator.

Thanks