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2021-02-26T12:35:38.769606Z
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netgraph/ng_car: Add color marking code

Chained policing should be able to reuse the classification of
traffic.  A new mbuf_tag type is defined to handle gereral QoS
marking.  A new subtype is defined to track the color marking.

Reviewed by:	manpages (bcr), melifaro, kp
Sponsored by:	IKS Service GmbH
Differential Revision: https://reviews.freebsd.org/D22110

(cherry picked from commit d0d2e523bafb74180f8bebb90788790f0d2f0290)

Git Hash:   d88ac710ce5828aad6b2ea76b217f3a17ae64232
Git Author: donner@FreeBSD.org
END