Network and socket enforcement toggles.
Counters for network objects (mbufs, ifnets, bpfdecs, sockets, and ipqs).
Label management routines for network objects.
Life cycle events for network objects.
Label internalization/externalization/relabel for ifnets, sockets,
including ioctl implementations for sockets, ifnets.
Access control checks relating to network obejcts.
Obtained from: TrustedBSD Project
Sponsored by: DARPA, Network Associates Laboratories