| flowi structure: |
| |
| The secid member in the flow structure is used in LSMs (e.g. SELinux) to indicate |
| the label of the flow. This label of the flow is currently used in selecting |
| matching labeled xfrm(s). |
| |
| If this is an outbound flow, the label is derived from the socket, if any, or |
| the incoming packet this flow is being generated as a response to (e.g. tcp |
| resets, timewait ack, etc.). It is also conceivable that the label could be |
| derived from other sources such as process context, device, etc., in special |
| cases, as may be appropriate. |
| |
| If this is an inbound flow, the label is derived from the IPSec security |
| associations, if any, used by the packet. |