xelerance/xl2tpd — pull request #18 by tphelps (2013-03-20 11:21:32+00:00)
Title: Set msgh.msg_controllen before calling CMSG_FIRSTHDR

It turns out that CMSG_FIRSTHDR refers to msg_controllen. Be sure to
set it to something sane before invoking that macro.

This is probably needed for OpenBSD.