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load.rs
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load.rs
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use std::{convert::TryInto as _, process::Command, thread, time};
use aya::{
maps::Array,
programs::{
links::{FdLink, PinnedLink},
loaded_programs, KProbe, TracePoint, UProbe, Xdp, XdpFlags,
},
util::KernelVersion,
Bpf,
};
const MAX_RETRIES: u32 = 100;
const RETRY_DURATION_MS: u64 = 10;
#[test]
fn long_name() {
let mut bpf = Bpf::load(crate::NAME_TEST).unwrap();
let name_prog: &mut Xdp = bpf
.program_mut("ihaveaverylongname")
.unwrap()
.try_into()
.unwrap();
name_prog.load().unwrap();
name_prog.attach("lo", XdpFlags::default()).unwrap();
// We used to be able to assert with bpftool that the program name was short.
// It seem though that it now uses the name from the ELF symbol table instead.
// Therefore, as long as we were able to load the program, this is good enough.
}
#[test]
fn multiple_btf_maps() {
let mut bpf = Bpf::load(crate::MULTIMAP_BTF).unwrap();
let map_1: Array<_, u64> = bpf.take_map("map_1").unwrap().try_into().unwrap();
let map_2: Array<_, u64> = bpf.take_map("map_2").unwrap().try_into().unwrap();
let prog: &mut TracePoint = bpf.program_mut("bpf_prog").unwrap().try_into().unwrap();
prog.load().unwrap();
prog.attach("sched", "sched_switch").unwrap();
thread::sleep(time::Duration::from_secs(3));
let key = 0;
let val_1 = map_1.get(&key, 0).unwrap();
let val_2 = map_2.get(&key, 0).unwrap();
assert_eq!(val_1, 24);
assert_eq!(val_2, 42);
}
fn is_linked(prog_id: &u32) -> bool {
let output = Command::new("bpftool").args(["link"]).output();
let output = output.expect("Failed to run 'bpftool link'");
let stdout = String::from_utf8(output.stdout).unwrap();
stdout.contains(&prog_id.to_string())
}
macro_rules! assert_loaded_and_linked {
($name:literal, $loaded:expr) => {
for i in 0..(MAX_RETRIES + 1) {
// Ignore race failures which can happen when the tests delete a
// program in the middle of a `loaded_programs()` call.
let id = loaded_programs()
.filter_map(|prog| prog.ok())
.find(|prog| prog.name() == $name.as_bytes())
.map(|prog| Some(prog.id()));
let mut linked = false;
if let Some(prog_id) = id {
linked = is_linked(&prog_id.unwrap());
if linked == $loaded {
break;
}
}
if i == MAX_RETRIES {
panic!(
"Expected (loaded/linked: {}) but found (id: {}, linked: {}",
$loaded,
id.is_some(),
linked
);
}
thread::sleep(time::Duration::from_millis(RETRY_DURATION_MS));
}
};
}
macro_rules! assert_loaded {
($name:literal, $loaded:expr) => {
for i in 0..(MAX_RETRIES + 1) {
// Ignore race failures which can happen when the tests delete a
// program in the middle of a `loaded_programs()` call.
let state = loaded_programs()
.filter_map(|prog| prog.ok())
.any(|prog| prog.name() == $name.as_bytes());
if state == $loaded {
break;
}
if i == MAX_RETRIES {
panic!("Expected loaded: {} but was loaded: {}", $loaded, state);
}
thread::sleep(time::Duration::from_millis(RETRY_DURATION_MS));
}
};
}
#[test]
fn unload_xdp() {
let mut bpf = Bpf::load(crate::TEST).unwrap();
let prog: &mut Xdp = bpf.program_mut("pass").unwrap().try_into().unwrap();
prog.load().unwrap();
assert_loaded!("pass", true);
let link = prog.attach("lo", XdpFlags::default()).unwrap();
{
let _link_owned = prog.take_link(link).unwrap();
prog.unload().unwrap();
assert_loaded_and_linked!("pass", true);
};
assert_loaded!("pass", false);
prog.load().unwrap();
assert_loaded!("pass", true);
prog.attach("lo", XdpFlags::default()).unwrap();
assert_loaded!("pass", true);
prog.unload().unwrap();
assert_loaded!("pass", false);
}
#[test]
fn unload_kprobe() {
let mut bpf = Bpf::load(crate::TEST).unwrap();
let prog: &mut KProbe = bpf.program_mut("test_kprobe").unwrap().try_into().unwrap();
prog.load().unwrap();
assert_loaded!("test_kprobe", true);
let link = prog.attach("try_to_wake_up", 0).unwrap();
{
let _link_owned = prog.take_link(link).unwrap();
prog.unload().unwrap();
assert_loaded_and_linked!("test_kprobe", true);
};
assert_loaded!("test_kprobe", false);
prog.load().unwrap();
assert_loaded!("test_kprobe", true);
prog.attach("try_to_wake_up", 0).unwrap();
assert_loaded!("test_kprobe", true);
prog.unload().unwrap();
assert_loaded!("test_kprobe", false);
}
#[test]
fn basic_tracepoint() {
let mut bpf = Bpf::load(crate::TEST).unwrap();
let prog: &mut TracePoint = bpf
.program_mut("test_tracepoint")
.unwrap()
.try_into()
.unwrap();
prog.load().unwrap();
assert_loaded!("test_tracepoint", true);
let link = prog.attach("syscalls", "sys_enter_kill").unwrap();
{
let _link_owned = prog.take_link(link).unwrap();
prog.unload().unwrap();
assert_loaded_and_linked!("test_tracepoint", true);
};
assert_loaded!("test_tracepoint", false);
prog.load().unwrap();
assert_loaded!("test_tracepoint", true);
prog.attach("syscalls", "sys_enter_kill").unwrap();
assert_loaded!("test_tracepoint", true);
prog.unload().unwrap();
assert_loaded!("test_tracepoint", false);
}
#[test]
fn basic_uprobe() {
let mut bpf = Bpf::load(crate::TEST).unwrap();
let prog: &mut UProbe = bpf.program_mut("test_uprobe").unwrap().try_into().unwrap();
prog.load().unwrap();
assert_loaded!("test_uprobe", true);
let link = prog
.attach(Some("uprobe_function"), 0, "/proc/self/exe", None)
.unwrap();
{
let _link_owned = prog.take_link(link).unwrap();
prog.unload().unwrap();
assert_loaded_and_linked!("test_uprobe", true);
};
assert_loaded!("test_uprobe", false);
prog.load().unwrap();
assert_loaded!("test_uprobe", true);
prog.attach(Some("uprobe_function"), 0, "/proc/self/exe", None)
.unwrap();
assert_loaded!("test_uprobe", true);
prog.unload().unwrap();
assert_loaded!("test_uprobe", false);
}
#[test]
fn pin_link() {
let kernel_version = KernelVersion::current().unwrap();
if kernel_version < KernelVersion::new(5, 9, 0) {
eprintln!("skipping test on kernel {kernel_version:?}, XDP uses netlink");
return;
}
let mut bpf = Bpf::load(crate::TEST).unwrap();
let prog: &mut Xdp = bpf.program_mut("pass").unwrap().try_into().unwrap();
prog.load().unwrap();
let link_id = prog.attach("lo", XdpFlags::default()).unwrap();
let link = prog.take_link(link_id).unwrap();
assert_loaded!("pass", true);
let fd_link: FdLink = link.try_into().unwrap();
let pinned = fd_link.pin("/sys/fs/bpf/aya-xdp-test-lo").unwrap();
// because of the pin, the program is still attached
prog.unload().unwrap();
assert_loaded!("pass", true);
// delete the pin, but the program is still attached
let new_link = pinned.unpin().unwrap();
assert_loaded!("pass", true);
// finally when new_link is dropped we're detached
drop(new_link);
assert_loaded!("pass", false);
}
#[test]
fn pin_lifecycle() {
let kernel_version = KernelVersion::current().unwrap();
if kernel_version < KernelVersion::new(5, 18, 0) {
eprintln!("skipping test on kernel {kernel_version:?}, support for BPF_F_XDP_HAS_FRAGS was added in 5.18.0; see https://github.com/torvalds/linux/commit/c2f2cdb");
return;
}
// 1. Load Program and Pin
{
let mut bpf = Bpf::load(crate::PASS).unwrap();
let prog: &mut Xdp = bpf.program_mut("pass").unwrap().try_into().unwrap();
prog.load().unwrap();
prog.pin("/sys/fs/bpf/aya-xdp-test-prog").unwrap();
}
// should still be loaded since prog was pinned
assert_loaded!("pass", true);
// 2. Load program from bpffs but don't attach it
{
let _ = Xdp::from_pin("/sys/fs/bpf/aya-xdp-test-prog").unwrap();
}
// should still be loaded since prog was pinned
assert_loaded!("pass", true);
// 3. Load program from bpffs and attach
{
let mut prog = Xdp::from_pin("/sys/fs/bpf/aya-xdp-test-prog").unwrap();
let link_id = prog.attach("lo", XdpFlags::default()).unwrap();
let link = prog.take_link(link_id).unwrap();
let fd_link: FdLink = link.try_into().unwrap();
fd_link.pin("/sys/fs/bpf/aya-xdp-test-lo").unwrap();
// Unpin the program. It will stay attached since its links were pinned.
prog.unpin().unwrap();
}
// should still be loaded since link was pinned
assert_loaded_and_linked!("pass", true);
// 4. Load a new version of the program, unpin link, and atomically replace old program
{
let mut bpf = Bpf::load(crate::PASS).unwrap();
let prog: &mut Xdp = bpf.program_mut("pass").unwrap().try_into().unwrap();
prog.load().unwrap();
let link = PinnedLink::from_pin("/sys/fs/bpf/aya-xdp-test-lo")
.unwrap()
.unpin()
.unwrap();
prog.attach_to_link(link.try_into().unwrap()).unwrap();
assert_loaded!("pass", true);
}
// program should be unloaded
assert_loaded!("pass", false);
}
#[test]
fn pin_lifecycle_tracepoint() {
// 1. Load Program and Pin
{
let mut bpf = Bpf::load(crate::TEST).unwrap();
let prog: &mut TracePoint = bpf
.program_mut("test_tracepoint")
.unwrap()
.try_into()
.unwrap();
prog.load().unwrap();
prog.pin("/sys/fs/bpf/aya-tracepoint-test-prog").unwrap();
}
// should still be loaded since prog was pinned
assert_loaded!("test_tracepoint", true);
// 2. Load program from bpffs but don't attach it
{
let _ = TracePoint::from_pin("/sys/fs/bpf/aya-tracepoint-test-prog").unwrap();
}
// should still be loaded since prog was pinned
assert_loaded!("test_tracepoint", true);
// 3. Load program from bpffs and attach
{
let mut prog = TracePoint::from_pin("/sys/fs/bpf/aya-tracepoint-test-prog").unwrap();
let link_id = prog.attach("syscalls", "sys_enter_kill").unwrap();
let link = prog.take_link(link_id).unwrap();
let fd_link: FdLink = link.try_into().unwrap();
fd_link
.pin("/sys/fs/bpf/aya-tracepoint-test-sys-enter-kill")
.unwrap();
// Unpin the program. It will stay attached since its links were pinned.
prog.unpin().unwrap();
}
// should still be loaded since link was pinned
assert_loaded_and_linked!("test_tracepoint", true);
// 4. unpin link, and make sure everything is unloaded
{
PinnedLink::from_pin("/sys/fs/bpf/aya-tracepoint-test-sys-enter-kill")
.unwrap()
.unpin()
.unwrap();
}
// program should be unloaded
assert_loaded!("test_tracepoint", false);
}
#[test]
fn pin_lifecycle_kprobe() {
// 1. Load Program and Pin
{
let mut bpf = Bpf::load(crate::TEST).unwrap();
let prog: &mut KProbe = bpf.program_mut("test_kprobe").unwrap().try_into().unwrap();
prog.load().unwrap();
prog.pin("/sys/fs/bpf/aya-kprobe-test-prog").unwrap();
}
// should still be loaded since prog was pinned
assert_loaded!("test_kprobe", true);
// 2. Load program from bpffs but don't attach it
{
let _ = KProbe::from_pin(
"/sys/fs/bpf/aya-kprobe-test-prog",
aya::programs::ProbeKind::KProbe,
)
.unwrap();
}
// should still be loaded since prog was pinned
assert_loaded!("test_kprobe", true);
// 3. Load program from bpffs and attach
{
let mut prog = KProbe::from_pin(
"/sys/fs/bpf/aya-kprobe-test-prog",
aya::programs::ProbeKind::KProbe,
)
.unwrap();
let link_id = prog.attach("try_to_wake_up", 0).unwrap();
let link = prog.take_link(link_id).unwrap();
let fd_link: FdLink = link.try_into().unwrap();
fd_link
.pin("/sys/fs/bpf/aya-kprobe-test-try-to-wake-up")
.unwrap();
// Unpin the program. It will stay attached since its links were pinned.
prog.unpin().unwrap();
}
// should still be loaded since link was pinned
assert_loaded_and_linked!("test_kprobe", true);
// 4. unpin link, and make sure everything is unloaded
{
PinnedLink::from_pin("/sys/fs/bpf/aya-kprobe-test-try-to-wake-up")
.unwrap()
.unpin()
.unwrap();
}
// program should be unloaded
assert_loaded!("test_kprobe", false);
}
#[no_mangle]
#[inline(never)]
extern "C" fn uprobe_function() {
core::hint::black_box(uprobe_function);
}
#[test]
fn pin_lifecycle_uprobe() {
const INITIAL_PIN_PATH: &str = "/sys/fs/bpf/aya-uprobe-test-prog";
const SECOND_PIN_PATH: &str = "/sys/fs/bpf/aya-uprobe-test-prog-2";
// 1. Load Program and Pin
{
let mut bpf = Bpf::load(crate::TEST).unwrap();
let prog: &mut UProbe = bpf.program_mut("test_uprobe").unwrap().try_into().unwrap();
prog.load().unwrap();
prog.pin(INITIAL_PIN_PATH).unwrap();
}
// should still be loaded since prog was pinned
assert_loaded!("test_uprobe", true);
// 2. Load program from bpffs but don't attach it
{
let _ = UProbe::from_pin(INITIAL_PIN_PATH, aya::programs::ProbeKind::UProbe).unwrap();
}
// should still be loaded since prog was pinned
assert_loaded!("test_uprobe", true);
// 3. Load program from bpffs and attach
{
let mut prog =
UProbe::from_pin(INITIAL_PIN_PATH, aya::programs::ProbeKind::UProbe).unwrap();
let link_id = prog
.attach(Some("uprobe_function"), 0, "/proc/self/exe", None)
.unwrap();
let link = prog.take_link(link_id).unwrap();
let fd_link: FdLink = link.try_into().unwrap();
fd_link.pin(SECOND_PIN_PATH).unwrap();
// Unpin the program. It will stay attached since its links were pinned.
prog.unpin().unwrap();
}
// should still be loaded since link was pinned
assert_loaded_and_linked!("test_uprobe", true);
// 4. unpin link, and make sure everything is unloaded
{
PinnedLink::from_pin(SECOND_PIN_PATH)
.unwrap()
.unpin()
.unwrap();
}
// program should be unloaded
assert_loaded!("test_uprobe", false);
// Make sure the function isn't optimized out.
uprobe_function();
}