const golang.org/x/sys/unix.NFNL_SUBSYS_CTNETLINK_EXP

one use

	golang.org/x/sys/unix (current package)
		zerrors_linux.go#L2181: 	NFNL_SUBSYS_CTNETLINK_EXP                   = 0x2

The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)