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//! Tests for the NetFilter functionality.
#[allow(dead_code)]
mod common;
use std::net::IpAddr;
use std::net::Ipv4Addr;
use std::net::Ipv6Addr;
use std::net::TcpListener;
use std::net::TcpStream;
use libbpf_rs::NetfilterOpts;
use libbpf_rs::Object;
use libbpf_rs::NFPROTO_IPV4;
use libbpf_rs::NFPROTO_IPV6;
use libbpf_rs::NF_INET_POST_ROUTING;
use libbpf_rs::NF_INET_PRE_ROUTING;
use crate::common::get_map_mut;
use crate::common::get_prog_mut;
use crate::common::get_test_object;
use crate::common::with_ringbuffer;
use test_tag::tag;
fn test_attach_and_detach(obj: &mut Object, protocol_family: i32, hooknum: i32, hook_desc: &str) {
let prog = get_prog_mut(obj, "handle_netfilter");
let netfilter_opt = libbpf_rs::NetfilterOpts {
protocol_family,
hooknum,
..NetfilterOpts::default()
};
let link = prog
.attach_netfilter_with_opts(netfilter_opt)
.unwrap_or_else(|err| {
panic!(
"Failed to attach netfilter protocol {protocol_family}, hook: {hook_desc}: {err}"
)
});
let map = get_map_mut(obj, "ringbuf");
let addr = match protocol_family {
NFPROTO_IPV4 => IpAddr::V4(Ipv4Addr::LOCALHOST),
NFPROTO_IPV6 => IpAddr::V6(Ipv6Addr::LOCALHOST),
_ => panic!("unknow protocol family: {protocol_family}"),
};
// We let the kernel decide what port to bind to.
let listener = TcpListener::bind((addr, 0)).unwrap();
let trigger_addr = listener.local_addr().unwrap();
let result = match hooknum {
NF_INET_PRE_ROUTING | NF_INET_POST_ROUTING => {
let action = || {
let _stream = TcpStream::connect(trigger_addr);
};
with_ringbuffer(&map, action)
}
_ => panic!("unsupported hook: {hooknum} ({hook_desc})"),
};
assert_eq!(result, 1);
assert!(link.detach().is_ok());
}
#[tag(root)]
#[test]
fn test_netfilter() {
let mut obj = get_test_object("netfilter.bpf.o");
// We don't test all hooks here, because support for some may be
// more limited.
// IPv4 hook
test_attach_and_detach(&mut obj, NFPROTO_IPV4, NF_INET_PRE_ROUTING, "PRE_ROUTING");
test_attach_and_detach(&mut obj, NFPROTO_IPV4, NF_INET_POST_ROUTING, "POST_ROUTING");
// IPv6 hook
test_attach_and_detach(&mut obj, NFPROTO_IPV6, NF_INET_PRE_ROUTING, "PRE_ROUTING");
test_attach_and_detach(&mut obj, NFPROTO_IPV6, NF_INET_POST_ROUTING, "POST_ROUTING");
}
#[tag(root)]
#[test]
fn test_invalid_netfilter_opts() {
let mut obj = get_test_object("netfilter.bpf.o");
let prog = get_prog_mut(&mut obj, "handle_netfilter");
let invalid_opts = NetfilterOpts {
protocol_family: 999,
hooknum: 999,
..NetfilterOpts::default()
};
let result = prog.attach_netfilter_with_opts(invalid_opts);
assert!(
result.is_err(),
"Expected error for invalid NetfilterOpts, but got Ok."
);
}
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