iproute2 and kernel headers

I am willing to put some headers (not all) in with the user level
code, provided they are copies since they I can easily update. I don't want
to get into keeping an edited set of headers in sync.

What headers really seem to change a lot? The obvious ones are:

	linux/pkt_sched.h
	linux/tcp_diag.h
	linux/xfrm.h