Dial sets up a netlink.Conn for testing using the specified Func.

Error returns a netlink error to the caller with the specified error number, in the body of the specified request message.

Multipart sends a slice of netlink.Messages to the caller as a netlink multi-part message.

PID is the netlink header PID value assigned by nltest.

A Func is a function that can be used to test netlink.Conn interactions.