NetLabel/CIPSO
With NetLabel/CIPSO support, traffic is labeled with sensitivity information that can be used across the network. Unlike labeled IPsec, no other context information is sent or synchronized. So when we see communication flows, they will originate from a single base context but will have sensitivity labels based on the sensitivity label of the remote side.
With NetLabel, mappings are defined that inform the system which communication flows (from particular interfaces, or even from particular IP addresses) are for a certain Domain of Interpretation (DOI). The CIPSO standard defines the DOI as a collection of systems that interpret the CIPSO label similarly or, in our case, use the same SELinux policy and configuration of sensitivity labels.
With the mappings in place, NetLabel/CIPSO will pass on the sensitivity information (and categories) between hosts. The context we will see on the communication flows will be netlabel_peer_t, a default context assigned to NetLabel/CIPSO originated...
