const golang.org/x/sys/unix.SizeofSockaddrL2TPIP6

2 uses

	golang.org/x/sys/unix (current package)
		syscall_linux.go#L899: 	return unsafe.Pointer(&sa.raw), SizeofSockaddrL2TPIP6, nil
		ztypes_linux.go#L518: 	SizeofSockaddrL2TPIP6   = 0x20