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use super::{DeserializationError, Expression, Rule};
use crate::sys;
use std::os::raw::c_char;
/// A counter expression adds a counter to the rule that is incremented to count number of packets
/// and number of bytes for all packets that have matched the rule.
#[derive(Debug, PartialEq)]
pub struct Counter {
pub nb_bytes: u64,
pub nb_packets: u64,
}
impl Counter {
pub fn new() -> Self {
Self {
nb_bytes: 0,
nb_packets: 0,
}
}
}
impl Expression for Counter {
fn get_raw_name() -> *const c_char {
b"counter\0" as *const _ as *const c_char
}
fn from_expr(expr: *const sys::nftnl_expr) -> Result<Self, DeserializationError> {
unsafe {
let nb_bytes = sys::nftnl_expr_get_u64(expr, sys::NFTNL_EXPR_CTR_BYTES as u16);
let nb_packets = sys::nftnl_expr_get_u64(expr, sys::NFTNL_EXPR_CTR_PACKETS as u16);
Ok(Counter {
nb_bytes,
nb_packets,
})
}
}
fn to_expr(&self, _rule: &Rule) -> *mut sys::nftnl_expr {
unsafe {
let expr = try_alloc!(sys::nftnl_expr_alloc(Self::get_raw_name()));
sys::nftnl_expr_set_u64(expr, sys::NFTNL_EXPR_CTR_BYTES as u16, self.nb_bytes);
sys::nftnl_expr_set_u64(expr, sys::NFTNL_EXPR_CTR_PACKETS as u16, self.nb_packets);
expr
}
}
}
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