whatcanGOwrong
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@@ -0,0 +1,273 @@
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package link
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import (
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"errors"
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"math"
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"os"
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"path/filepath"
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"reflect"
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"testing"
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"github.com/cilium/ebpf"
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"github.com/cilium/ebpf/asm"
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"github.com/cilium/ebpf/internal/sys"
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"github.com/cilium/ebpf/internal/testutils"
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"github.com/cilium/ebpf/internal/testutils/fdtrace"
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"github.com/cilium/ebpf/internal/unix"
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qt "github.com/frankban/quicktest"
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)
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func TestMain(m *testing.M) {
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fdtrace.TestMain(m)
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}
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func TestRawLink(t *testing.T) {
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cgroup, prog := mustCgroupFixtures(t)
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link, err := AttachRawLink(RawLinkOptions{
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Target: int(cgroup.Fd()),
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Program: prog,
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Attach: ebpf.AttachCGroupInetEgress,
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})
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testutils.SkipIfNotSupported(t, err)
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if err != nil {
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t.Fatal("Can't create raw link:", err)
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}
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info, err := link.Info()
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if err != nil {
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t.Fatal("Can't get link info:", err)
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}
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pi, err := prog.Info()
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if err != nil {
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t.Fatal("Can't get program info:", err)
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}
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progID, ok := pi.ID()
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if !ok {
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t.Fatal("Program ID not available in program info")
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}
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if info.Program != progID {
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t.Error("Link program ID doesn't match program ID")
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}
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testLink(t, &linkCgroup{*link}, prog)
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}
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func TestUnpinRawLink(t *testing.T) {
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cgroup, prog := mustCgroupFixtures(t)
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link, _ := newPinnedRawLink(t, cgroup, prog)
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defer link.Close()
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qt.Assert(t, link.IsPinned(), qt.IsTrue)
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if err := link.Unpin(); err != nil {
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t.Fatal(err)
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}
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qt.Assert(t, link.IsPinned(), qt.IsFalse)
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}
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func TestRawLinkLoadPinnedWithOptions(t *testing.T) {
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cgroup, prog := mustCgroupFixtures(t)
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link, path := newPinnedRawLink(t, cgroup, prog)
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defer link.Close()
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qt.Assert(t, link.IsPinned(), qt.IsTrue)
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// It seems like the kernel ignores BPF_F_RDONLY when updating a link,
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// so we can't test this.
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_, err := loadPinnedRawLink(path, &ebpf.LoadPinOptions{
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Flags: math.MaxUint32,
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})
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if !errors.Is(err, unix.EINVAL) {
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t.Fatal("Invalid flags don't trigger an error:", err)
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}
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}
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func newPinnedRawLink(t *testing.T, cgroup *os.File, prog *ebpf.Program) (*RawLink, string) {
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t.Helper()
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link, err := AttachRawLink(RawLinkOptions{
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Target: int(cgroup.Fd()),
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Program: prog,
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Attach: ebpf.AttachCGroupInetEgress,
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})
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testutils.SkipIfNotSupported(t, err)
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if err != nil {
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t.Fatal("Can't create raw link:", err)
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}
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path := filepath.Join(testutils.TempBPFFS(t), "link")
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err = link.Pin(path)
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testutils.SkipIfNotSupported(t, err)
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if err != nil {
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t.Fatal(err)
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}
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return link, path
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}
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func mustCgroupFixtures(t *testing.T) (*os.File, *ebpf.Program) {
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t.Helper()
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testutils.SkipIfNotSupported(t, haveProgAttach())
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return testutils.CreateCgroup(t), mustLoadProgram(t, ebpf.CGroupSKB, 0, "")
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}
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func testLink(t *testing.T, link Link, prog *ebpf.Program) {
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t.Helper()
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tmp, err := os.MkdirTemp("/sys/fs/bpf", "ebpf-test")
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if err != nil {
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t.Fatal(err)
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}
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defer os.RemoveAll(tmp)
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t.Run("link/pinning", func(t *testing.T) {
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path := filepath.Join(tmp, "link")
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err = link.Pin(path)
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testutils.SkipIfNotSupported(t, err)
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if err != nil {
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t.Fatalf("Can't pin %T: %s", link, err)
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}
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link2, err := LoadPinnedLink(path, nil)
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if err != nil {
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t.Fatalf("Can't load pinned %T: %s", link, err)
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}
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link2.Close()
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if reflect.TypeOf(link) != reflect.TypeOf(link2) {
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t.Errorf("Loading a pinned %T returns a %T", link, link2)
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}
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_, err = LoadPinnedLink(path, &ebpf.LoadPinOptions{
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Flags: math.MaxUint32,
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})
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if !errors.Is(err, unix.EINVAL) {
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t.Errorf("Loading a pinned %T doesn't respect flags", link)
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}
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})
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t.Run("link/update", func(t *testing.T) {
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err := link.Update(prog)
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testutils.SkipIfNotSupported(t, err)
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if err != nil {
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t.Fatal("Update returns an error:", err)
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}
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func() {
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// Panicking is OK
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defer func() {
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_ = recover()
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}()
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if err := link.Update(nil); err == nil {
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t.Fatalf("%T.Update accepts nil program", link)
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}
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}()
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})
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t.Run("link/info", func(t *testing.T) {
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info, err := link.Info()
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testutils.SkipIfNotSupported(t, err)
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if err != nil {
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t.Fatal("Link info returns an error:", err)
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}
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if info.Type == 0 {
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t.Fatal("Failed to get link info type")
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}
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switch info.Type {
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case sys.BPF_LINK_TYPE_TRACING:
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if info.Tracing() == nil {
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t.Fatalf("Failed to get link tracing extra info")
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}
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case sys.BPF_LINK_TYPE_CGROUP:
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cg := info.Cgroup()
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if cg.CgroupId == 0 {
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t.Fatalf("Failed to get link Cgroup extra info")
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}
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case sys.BPF_LINK_TYPE_NETNS:
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netns := info.NetNs()
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if netns.AttachType == 0 {
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t.Fatalf("Failed to get link NetNs extra info")
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}
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case sys.BPF_LINK_TYPE_XDP:
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xdp := info.XDP()
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if xdp.Ifindex == 0 {
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t.Fatalf("Failed to get link XDP extra info")
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}
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}
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})
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type FDer interface {
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FD() int
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}
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t.Run("from fd", func(t *testing.T) {
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fder, ok := link.(FDer)
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if !ok {
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t.Skip("Link doesn't allow retrieving FD")
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}
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// We need to dup the FD since NewLinkFromFD takes
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// ownership.
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dupFD, err := unix.FcntlInt(uintptr(fder.FD()), unix.F_DUPFD_CLOEXEC, 1)
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if err != nil {
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t.Fatal("Can't dup link FD:", err)
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}
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defer unix.Close(dupFD)
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newLink, err := NewLinkFromFD(dupFD)
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testutils.SkipIfNotSupported(t, err)
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if err != nil {
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t.Fatal("Can't create new link from dup link FD:", err)
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}
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defer newLink.Close()
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if reflect.TypeOf(newLink) != reflect.TypeOf(link) {
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t.Fatalf("Expected type %T, got %T", link, newLink)
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}
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})
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if err := link.Close(); err != nil {
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t.Fatalf("%T.Close returns an error: %s", link, err)
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}
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}
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func mustLoadProgram(tb testing.TB, typ ebpf.ProgramType, attachType ebpf.AttachType, attachTo string) *ebpf.Program {
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tb.Helper()
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license := "MIT"
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switch typ {
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case ebpf.RawTracepoint, ebpf.LSM:
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license = "GPL"
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}
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prog, err := ebpf.NewProgram(&ebpf.ProgramSpec{
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Type: typ,
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AttachType: attachType,
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AttachTo: attachTo,
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License: license,
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Instructions: asm.Instructions{
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asm.Mov.Imm(asm.R0, 0),
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asm.Return(),
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},
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})
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if err != nil {
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tb.Fatal(err)
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}
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tb.Cleanup(func() {
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prog.Close()
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})
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return prog
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}
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