About LLC

Hi all,

These days i have read the code of the LLC in net/llc kernel 2.6.16,
and found that
when up-layer want to recv 802.2 frame, LLC *only* forward the
frame ,but does nothing else. It most like LLC TYPE1 does, but not
supply the full function as TYPE1 does.

Also I want to see how LLC does TYPE2, but i only see a socket
interface to supply the type, and up-layer cannot does LLC TYPE2
without using socket?

i don't know why? why linux uses only *socket* to do LLC TYPE2??

thanks,
Evan