feat: add nfqueue

__network/nfqueue/src/main.rs

@@ -0,0 +1,47 @@
+
+use libc;
+use nfqueue;
+
+struct State {
+    count: u32,
+}
+
+impl State {
+    pub fn new() -> State {
+        State { count: 0 }
+    }
+}
+
+fn queue_callback(msg: &nfqueue::Message, state: &mut State) {
+    println!("Packet received [id: 0x{:x}]\n", msg.get_id());
+
+    println!(" -> msg: {}", msg);
+
+    println!(
+        "XML\n{}",
+        msg.as_xml_str(&[nfqueue::XMLFormatFlags::XmlAll]).unwrap()
+    );
+
+    state.count += 1;
+    println!("count: {}", state.count);
+
+    msg.set_verdict(nfqueue::Verdict::Accept);
+}
+
+fn main() {
+    let mut q = nfqueue::Queue::new(State::new());// .unwrap();
+
+    println!("nfqueue example program: print packets metadata and accept packets");
+
+    q.open();
+    q.unbind(libc::AF_INET); // ignore result, failure is not critical here
+
+    let rc = q.bind(libc::AF_INET);
+    assert!(rc == 0);
+
+    q.create_queue(0, queue_callback);
+    q.set_mode(nfqueue::CopyMode::CopyPacket, 0xffff);
+
+    q.run_loop();
+}
+