References: golang.org/x/sys/unix.NF_INET_PRE

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

one use

	golang.org/x/sys/unix (current package)
		ztypes_linux.go#L1992: 	NF_INET_PRE_ROUTING  = 0x0

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