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use super::{Expression, Register, Rule};
use rustables_sys as sys;
use std::ffi::c_void;
use std::mem::size_of_val;
use std::os::raw::c_char;
/// An immediate expression. Used to set immediate data.
/// Verdicts are handled separately by [Verdict].
#[derive(Debug, Clone, Eq, PartialEq, Hash)]
pub struct Immediate<T> {
pub data: T,
pub register: Register,
}
impl<T> Immediate<T> {
pub fn new(data: T, register: Register) -> Self {
Self { data, register }
}
}
impl<T> Expression for Immediate<T> {
fn to_expr(&self, _rule: &Rule) -> *mut sys::nftnl_expr {
unsafe {
let expr = try_alloc!(sys::nftnl_expr_alloc(
b"immediate\0" as *const _ as *const c_char
));
sys::nftnl_expr_set_u32(
expr,
sys::NFTNL_EXPR_IMM_DREG as u16,
self.register.to_raw(),
);
sys::nftnl_expr_set(
expr,
sys::NFTNL_EXPR_IMM_DATA as u16,
&self.data as *const _ as *const c_void,
size_of_val(&self.data) as u32,
);
expr
}
}
}
#[macro_export]
macro_rules! nft_expr_immediate {
(data $value:expr) => {
$crate::expr::Immediate {
data: $value,
register: $crate::expr::Register::Reg1,
}
};
}
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