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

one use

	golang.org/x/sys/unix (current package)
		ztypes_linux.go#L2842: 	BPF_NETFILTER                              = 0x2d

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