rwatson f476cee602 Introduce support for Mandatory Access Control and extensible
kernel access control.

Label network interface structures, permitting security features to
be maintained on those objects.  if_label will be used to authorize
data flow using the network interface.  if_label will be protected
using the same synchronization primitives as other mutable entries
in struct ifnet.

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, NAI Labs
2002-07-30 23:06:07 +00:00
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