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// SPDX-License-Identifier: GPL-2.0
//! Rust netfilter sample.
use kernel::net;
use kernel::net::filter::{self as netfilter, inet, Disposition, Family};
use kernel::prelude::*;
module! {
type: RustNetfilter,
name: b"rust_netfilter",
author: b"Rust for Linux Contributors",
description: b"Rust netfilter sample",
license: b"GPL",
}
struct RustNetfilter {
_in: Pin<Box<netfilter::Registration<Self>>>,
_out: Pin<Box<netfilter::Registration<Self>>>,
}
impl netfilter::Filter for RustNetfilter {
fn filter(_: (), skb: &net::SkBuff) -> Disposition {
let data = skb.head_data();
pr_info!(
"packet headlen={}, len={}, first bytes={:02x?}\n",
data.len(),
skb.len(),
&data[..core::cmp::min(10, data.len())]
);
Disposition::Accept
}
}
impl kernel::Module for RustNetfilter {
fn init(_name: &'static CStr, _module: &'static ThisModule) -> Result<Self> {
Ok(Self {
_in: netfilter::Registration::new_pinned(
Family::INet(inet::Hook::PreRouting),
0,
net::init_ns().into(),
None,
(),
)?,
_out: netfilter::Registration::new_pinned(
Family::INet(inet::Hook::PostRouting),
0,
net::init_ns().into(),
None,
(),
)?,
})
}
}
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