>Now, would it really have been so difficult to answer "because RFC2292
>says so" to my first message?

	CMSG_ALIGN is not in RFC2292 (local to netbsd), so i felt the need to
	describe the current situation w/ netbsd.  i assumed that you have
	seen the diagram before writing the first message (= knows meaening
	of cmsg_len and issues with padding).

itojun